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 #include <syslog.h>
36 
37 #include "log.h"
38 
39 struct conf *conf;
40 
41 static const char	*default_host = "*";
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_port_num(int);
96 int		 check_prefork_num(int);
97 void		 advance_loc(void);
98 void		 advance_proxy(void);
99 void		 parsehp(char *, char **, const char **, const char *);
100 int		 fastcgi_conf(const char *, const char *);
101 void		 add_param(char *, char *);
102 int		 getservice(const char *);
103 void		 listen_on(const char *, const char *);
104 
105 static struct vhost		*host;
106 static struct location		*loc;
107 static struct proxy		*proxy;
108 static char			*current_media;
109 static int			 errors;
110 
111 typedef struct {
112 	union {
113 		char	*string;
114 		int	 number;
115 	} v;
116 	int lineno;
117 } YYSTYPE;
118 
119 #define YYSTYPE YYSTYPE
120 
121 %}
122 
123 /* for bison: */
124 /* %define parse.error verbose */
125 
126 %token	ACCESS ALIAS AUTO
127 %token	BLOCK
128 %token	CA CERT CHROOT CLIENT COMBINED COMMON CONDENSED
129 %token	DEFAULT
130 %token	FACILITY FASTCGI FOR_HOST
131 %token	INCLUDE INDEX IPV6
132 %token	KEY
133 %token	LANG LEGACY LISTEN LOCATION LOG
134 %token	OCSP OFF ON
135 %token	PARAM PORT PREFORK PROTO PROTOCOLS PROXY
136 %token	RELAY_TO REQUIRE RETURN ROOT
137 %token	SERVER SNI SOCKET STRIP STYLE SYSLOG
138 %token	TCP TOEXT TYPE TYPES
139 %token	USE_TLS USER
140 %token	VERIFYNAME
141 
142 %token	ERROR
143 
144 %token	<v.string>	STRING
145 %token	<v.number>	NUM
146 
147 %type	<v.number>	bool proxy_port
148 %type	<v.string>	string numberstring listen_addr
149 
150 %%
151 
152 conf		: /* empty */
153 		| conf include '\n'
154 		| conf '\n'
155 		| conf varset '\n'
156 		| conf option '\n'
157 		| conf vhost '\n'
158 		| conf types '\n'
159 		| conf error '\n'		{ file->errors++; }
160 		;
161 
162 include		: INCLUDE STRING		{
163 			struct file	*nfile;
164 
165 			if ((nfile = pushfile($2, 0)) == NULL) {
166 				yyerror("failed to include file %s", $2);
167 				free($2);
168 				YYERROR;
169 			}
170 			free($2);
171 
172 			file = nfile;
173 			lungetc('\n');
174 		}
175 		;
176 
177 bool		: ON	{ $$ = 1; }
178 		| OFF	{ $$ = 0; }
179 		;
180 
181 string		: string STRING	{
182 			if (asprintf(&$$, "%s%s", $1, $2) == -1) {
183 				free($1);
184 				free($2);
185 				yyerror("string: asprintf: %s", strerror(errno));
186 				YYERROR;
187 			}
188 			free($1);
189 			free($2);
190 		}
191 		| STRING
192 		;
193 
194 numberstring	: NUM {
195 			char *s;
196 			if (asprintf(&s, "%d", $1) == -1) {
197 				yyerror("asprintf: number");
198 				YYERROR;
199 			}
200 			$$ = s;
201 		}
202 		| STRING
203 		;
204 
205 varset		: STRING '=' string		{
206 			char *s = $1;
207 			while (*s++) {
208 				if (isspace((unsigned char)*s)) {
209 					yyerror("macro name cannot contain "
210 					    "whitespaces");
211 					free($1);
212 					free($3);
213 					YYERROR;
214 				}
215 			}
216 			symset($1, $3, 0);
217 			free($1);
218 			free($3);
219 		}
220 		;
221 
222 option		: CHROOT string	{
223 			if (strlcpy(conf->chroot, $2, sizeof(conf->chroot)) >=
224 			    sizeof(conf->chroot))
225 				yyerror("chroot path too long");
226 			free($2);
227 		}
228 		| IPV6 bool {
229 			yywarn("option `ipv6' is deprecated,"
230 			    " please use `listen on'");
231 			if ($2)
232 				default_host = "*";
233 			else
234 				default_host = "0.0.0.0";
235 		}
236 		| log
237 		| PORT NUM {
238 			yywarn("option `port' is deprecated,"
239 			    " please use `listen on'");
240 			default_port = $2;
241 		}
242 		| PREFORK NUM		{ conf->prefork = check_prefork_num($2); }
243 		| PROTOCOLS string {
244 			if (tls_config_parse_protocols(&conf->protos, $2) == -1)
245 				yyerror("invalid protocols string \"%s\"", $2);
246 			free($2);
247 		}
248 		| USER string {
249 			if (strlcpy(conf->user, $2, sizeof(conf->user)) >=
250 			    sizeof(conf->user))
251 				yyerror("user name too long");
252 			free($2);
253 		}
254 		;
255 
256 log		: LOG '{' optnl logopts '}'
257 		| LOG logopt
258 		;
259 
260 logopts		: /* empty */
261 		| logopts logopt optnl
262 		;
263 
264 logopt		: ACCESS string		{
265 			free(conf->log_access);
266 			conf->log_access = $2;
267 		}
268 		| STYLE COMMON		{
269 			conf->log_format = LOG_FORMAT_COMMON;
270 		}
271 		| STYLE COMBINED	{
272 			conf->log_format = LOG_FORMAT_COMBINED;
273 		}
274 		| STYLE CONDENSED	{
275 			conf->log_format = LOG_FORMAT_CONDENSED;
276 		}
277 		| STYLE LEGACY		{
278 			conf->log_format = LOG_FORMAT_LEGACY;
279 		}
280 		| SYSLOG FACILITY string {
281 			const char *str = $3;
282 
283 			conf->log_syslog = 1;
284 
285 			if (!strncasecmp(str, "LOG_", 4))
286 				str += 4;
287 
288 			if (!strcasecmp(str, "daemon"))
289 				conf->log_facility = LOG_DAEMON;
290 #ifdef LOG_FTP
291 			else if (!strcasecmp(str, "ftp"))
292 				conf->log_facility = LOG_FTP;
293 #endif
294 			else if (!strcasecmp(str, "local1"))
295 				conf->log_facility = LOG_LOCAL1;
296 			else if (!strcasecmp(str, "local2"))
297 				conf->log_facility = LOG_LOCAL2;
298 			else if (!strcasecmp(str, "local3"))
299 				conf->log_facility = LOG_LOCAL3;
300 			else if (!strcasecmp(str, "local4"))
301 				conf->log_facility = LOG_LOCAL4;
302 			else if (!strcasecmp(str, "local5"))
303 				conf->log_facility = LOG_LOCAL5;
304 			else if (!strcasecmp(str, "local6"))
305 				conf->log_facility = LOG_LOCAL6;
306 			else if (!strcasecmp(str, "local7"))
307 				conf->log_facility = LOG_LOCAL7;
308 			else if (!strcasecmp(str, "user"))
309 				conf->log_facility = LOG_USER;
310 			else
311 				yywarn("unknown syslog facility `%s'",
312 				    $3);
313 
314 			free($3);
315 		}
316 		| SYSLOG OFF		{
317 			conf->log_syslog = 0;
318 		}
319 		| SYSLOG		{
320 			conf->log_syslog = 1;
321 		}
322 		;
323 
324 vhost		: SERVER string {
325 			host = new_vhost();
326 			TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
327 
328 			loc = new_location();
329 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
330 
331 			TAILQ_INIT(&host->proxies);
332 
333 			(void) strlcpy(loc->match, "*", sizeof(loc->match));
334 			(void) strlcpy(host->domain, $2, sizeof(host->domain));
335 
336 			if (strstr($2, "xn--") != NULL) {
337 				yywarn("\"%s\" looks like punycode: you "
338 				    "should use the decoded hostname", $2);
339 			}
340 
341 			free($2);
342 		} '{' optnl servbody '}' {
343 			if (host->cert_path == NULL ||
344 			    host->key_path == NULL)
345 				yyerror("invalid vhost definition: %s",
346 				    host->domain);
347 			if (TAILQ_EMPTY(&host->addrs)) {
348 				char portno[32];
349 				int r;
350 
351 				r = snprintf(portno, sizeof(portno), "%d",
352 				    default_port);
353 				if (r < 0 || (size_t)r >= sizeof(portno))
354 					fatal("snprintf");
355 
356 				yywarn("missing `listen on' in server %s,"
357 				    " assuming %s port %d", $2, default_host,
358 				    default_port);
359 				listen_on(default_host, portno);
360 			}
361 		}
362 		| error '}'		{ yyerror("bad server directive"); }
363 		;
364 
365 servbody	: /* empty */
366 		| servbody servopt optnl
367 		| servbody location optnl
368 		| servbody proxy optnl
369 		;
370 
371 listen_addr	: '*' { $$ = NULL; }
372 		| STRING
373 		;
374 
375 servopt		: ALIAS string {
376 			struct alist *a;
377 
378 			a = xcalloc(1, sizeof(*a));
379 			(void) strlcpy(a->alias, $2, sizeof(a->alias));
380 			free($2);
381 			TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
382 		}
383 		| CERT string		{
384 			ensure_absolute_path($2);
385 			free(host->cert_path);
386 			host->cert_path = $2;
387 		}
388 		| KEY string		{
389 			ensure_absolute_path($2);
390 			free(host->key_path);
391 			host->key_path = $2;
392 		}
393 		| OCSP string		{
394 			ensure_absolute_path($2);
395 			free(host->ocsp_path);
396 			host->ocsp_path = $2;
397 		}
398 		| PARAM string '=' string {
399 			yywarn("the top-level `param' directive is deprecated."
400 			    "  Please use `fastcgi { param ... }`");
401 			add_param($2, $4);
402 		}
403 		| LISTEN ON listen_addr {
404 			listen_on($3, "1965");
405 		}
406 		| LISTEN ON listen_addr PORT STRING {
407 			listen_on($3, $5);
408 			free($3);
409 			free($5);
410 		}
411 		| LISTEN ON listen_addr PORT NUM {
412 			char portno[32];
413 			int r;
414 
415 			r = snprintf(portno, sizeof(portno), "%d", $5);
416 			if (r < 0 || (size_t)r >= sizeof(portno))
417 				fatal("snprintf");
418 
419 			listen_on($3, portno);
420 			free($3);
421 		}
422 		| locopt
423 		;
424 
425 proxy		: PROXY { advance_proxy(); }
426 		  proxy_matches '{' optnl proxy_opts '}' {
427 			if (*proxy->host == '\0')
428 				yyerror("invalid proxy block: missing `relay-to' option");
429 
430 			if ((proxy->cert_path == NULL && proxy->key_path != NULL) ||
431 			    (proxy->cert_path != NULL && proxy->key_path == NULL))
432 				yyerror("invalid proxy block: missing cert or key");
433 		}
434 		;
435 
436 proxy_matches	: /* empty */
437 		| proxy_matches proxy_match
438 		;
439 
440 proxy_port	: /* empty */	{ $$ = 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 optsemicolon
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 		;
635 
636 optnl		: '\n' optnl		/* zero or more newlines */
637 		| ';' optnl		/* semicolons too */
638 		| /*empty*/
639 		;
640 
641 optsemicolon	: ';'
642 		|
643 		;
644 
645 %%
646 
647 static const struct keyword {
648 	const char *word;
649 	int token;
650 } keywords[] = {
651 	/* these MUST be sorted */
652 	{"access", ACCESS},
653 	{"alias", ALIAS},
654 	{"auto", AUTO},
655 	{"block", BLOCK},
656 	{"ca", CA},
657 	{"cert", CERT},
658 	{"chroot", CHROOT},
659 	{"client", CLIENT},
660 	{"combined", COMBINED},
661 	{"common", COMMON},
662 	{"condensed", CONDENSED},
663 	{"default", DEFAULT},
664 	{"facility", FACILITY},
665 	{"fastcgi", FASTCGI},
666 	{"for-host", FOR_HOST},
667 	{"include", INCLUDE},
668 	{"index", INDEX},
669 	{"ipv6", IPV6},
670 	{"key", KEY},
671 	{"lang", LANG},
672 	{"legacy", LEGACY},
673 	{"listen", LISTEN},
674 	{"location", LOCATION},
675 	{"log", LOG},
676 	{"ocsp", OCSP},
677 	{"off", OFF},
678 	{"on", ON},
679 	{"param", PARAM},
680 	{"port", PORT},
681 	{"prefork", PREFORK},
682 	{"proto", PROTO},
683 	{"protocols", PROTOCOLS},
684 	{"proxy", PROXY},
685 	{"relay-to", RELAY_TO},
686 	{"require", REQUIRE},
687 	{"return", RETURN},
688 	{"root", ROOT},
689 	{"server", SERVER},
690 	{"sni", SNI},
691 	{"socket", SOCKET},
692 	{"strip", STRIP},
693 	{"style", STYLE},
694 	{"syslog", SYSLOG},
695 	{"tcp", TCP},
696 	{"to-ext", TOEXT},
697 	{"type", TYPE},
698 	{"types", TYPES},
699 	{"use-tls", USE_TLS},
700 	{"user", USER},
701 	{"verifyname", VERIFYNAME},
702 };
703 
704 void
705 yyerror(const char *msg, ...)
706 {
707 	va_list ap;
708 
709 	file->errors++;
710 
711 	va_start(ap, msg);
712 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
713 	vfprintf(stderr, msg, ap);
714 	fprintf(stderr, "\n");
715 	va_end(ap);
716 }
717 
718 void
719 yywarn(const char *msg, ...)
720 {
721 	va_list ap;
722 
723 	va_start(ap, msg);
724 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
725 	vfprintf(stderr, msg, ap);
726 	fprintf(stderr, "\n");
727 	va_end(ap);
728 }
729 
730 int
731 kw_cmp(const void *k, const void *e)
732 {
733 	return strcmp(k, ((struct keyword *)e)->word);
734 }
735 
736 int
737 lookup(char *s)
738 {
739 	const struct keyword	*p;
740 
741 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
742 	    sizeof(keywords[0]), kw_cmp);
743 
744 	if (p)
745 		return p->token;
746 	else
747 		return STRING;
748 }
749 
750 #define START_EXPAND	1
751 #define DONE_EXPAND	2
752 
753 static int	expanding;
754 
755 int
756 igetc(void)
757 {
758 	int	c;
759 
760 	while (1) {
761 		if (file->ungetpos > 0)
762 			c = file->ungetbuf[--file->ungetpos];
763 		else
764 			c = getc(file->stream);
765 
766 		if (c == START_EXPAND)
767 			expanding = 1;
768 		else if (c == DONE_EXPAND)
769 			expanding = 0;
770 		else
771 			break;
772 	}
773 	return c;
774 }
775 
776 int
777 lgetc(int quotec)
778 {
779 	int		c, next;
780 
781 	if (quotec) {
782 		if ((c = igetc()) == EOF) {
783 			yyerror("reached end of file while parsing "
784 			    "quoted string");
785 			if (file == topfile || popfile() == EOF)
786 				return EOF;
787 			return quotec;
788 		}
789 		return c;
790 	}
791 
792 	while ((c = igetc()) == '\\') {
793 		next = igetc();
794 		if (next != '\n') {
795 			c = next;
796 			break;
797 		}
798 		yylval.lineno = file->lineno;
799 		file->lineno++;
800 	}
801 
802 	if (c == EOF) {
803 		/*
804 		 * Fake EOL when hit EOF for the first time. This gets line
805 		 * count right if last line in included file is syntactically
806 		 * invalid and has no newline.
807 		 */
808 		if (file->eof_reached == 0) {
809 			file->eof_reached = 1;
810 			return '\n';
811 		}
812 		while (c == EOF) {
813 			if (file == topfile || popfile() == EOF)
814 				return EOF;
815 			c = igetc();
816 		}
817 	}
818 	return c;
819 }
820 
821 void
822 lungetc(int c)
823 {
824 	if (c == EOF)
825 		return;
826 
827 	if (file->ungetpos >= file->ungetsize) {
828 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
829 		if (p == NULL)
830 			fatal("lungetc");
831 		file->ungetbuf = p;
832 		file->ungetsize *= 2;
833 	}
834 	file->ungetbuf[file->ungetpos++] = c;
835 }
836 
837 int
838 findeol(void)
839 {
840 	int	c;
841 
842 	/* Skip to either EOF or the first real EOL. */
843 	while (1) {
844 		c = lgetc(0);
845 		if (c == '\n') {
846 			file->lineno++;
847 			break;
848 		}
849 		if (c == EOF)
850 			break;
851 	}
852 	return ERROR;
853 }
854 
855 int
856 yylex(void)
857 {
858 	char	 buf[8096];
859 	char	*p, *val;
860 	int	 quotec, next, c;
861 	int	 token;
862 
863 top:
864 	p = buf;
865 	while ((c = lgetc(0)) == ' ' || c == '\t')
866 		; /* nothing */
867 
868 	yylval.lineno = file->lineno;
869 	if (c == '#')
870 		while ((c = lgetc(0)) != '\n' && c != EOF)
871 			; /* nothing */
872 	if (c == '$' && !expanding) {
873 		while (1) {
874 			if ((c = lgetc(0)) == EOF)
875 				return 0;
876 			if (p + 1 >= buf + sizeof(buf) -1) {
877 				yyerror("string too long");
878 				return findeol();
879 			}
880 			if (isalnum(c) || c == '_') {
881 				*p++ = c;
882 				continue;
883 			}
884 			*p = '\0';
885 			lungetc(c);
886 			break;
887 		}
888 		val = symget(buf);
889 		if (val == NULL) {
890 			yyerror("macro `%s' not defined", buf);
891 			return findeol();
892 		}
893 		yylval.v.string = xstrdup(val);
894 		return STRING;
895 	}
896 	if (c == '@' && !expanding) {
897 		while (1) {
898 			if ((c = lgetc(0)) == EOF)
899 				return 0;
900 
901 			if (p + 1 >= buf + sizeof(buf) - 1) {
902 				yyerror("string too long");
903 				return findeol();
904 			}
905 			if (isalnum(c) || c == '_') {
906 				*p++ = c;
907 				continue;
908 			}
909 			*p = '\0';
910 			lungetc(c);
911 			break;
912 		}
913 		val = symget(buf);
914 		if (val == NULL) {
915 			yyerror("macro '%s' not defined", buf);
916 			return findeol();
917 		}
918 		p = val + strlen(val) - 1;
919 		lungetc(DONE_EXPAND);
920 		while (p >= val) {
921 			lungetc(*p);
922 			p--;
923 		}
924 		lungetc(START_EXPAND);
925 		goto top;
926 	}
927 
928 	switch (c) {
929 	case '\'':
930 	case '"':
931 		quotec = c;
932 		while (1) {
933 			if ((c = lgetc(quotec)) == EOF)
934 				return 0;
935 			if (c == '\n') {
936 				file->lineno++;
937 				continue;
938 			} else if (c == '\\') {
939 				if ((next = lgetc(quotec)) == EOF)
940 					return (0);
941 				if (next == quotec || next == ' ' ||
942 				    next == '\t')
943 					c = next;
944 				else if (next == '\n') {
945 					file->lineno++;
946 					continue;
947 				} else
948 					lungetc(next);
949 			} else if (c == quotec) {
950 				*p = '\0';
951 				break;
952 			} else if (c == '\0') {
953 				yyerror("invalid syntax");
954 				return findeol();
955 			}
956 			if (p + 1 >= buf + sizeof(buf) - 1) {
957 				yyerror("string too long");
958 				return findeol();
959 			}
960 			*p++ = c;
961 		}
962 		yylval.v.string = strdup(buf);
963 		if (yylval.v.string == NULL)
964 			fatal("yylex: strdup");
965 		return STRING;
966 	}
967 
968 #define allowed_to_end_number(x) \
969 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
970 
971 	if (c == '-' || isdigit(c)) {
972 		do {
973 			*p++ = c;
974 			if ((size_t)(p-buf) >= sizeof(buf)) {
975 				yyerror("string too long");
976 				return findeol();
977 			}
978 		} while ((c = lgetc(0)) != EOF && isdigit(c));
979 		lungetc(c);
980 		if (p == buf + 1 && buf[0] == '-')
981 			goto nodigits;
982 		if (c == EOF || allowed_to_end_number(c)) {
983 			const char *errstr = NULL;
984 
985 			*p = '\0';
986 			yylval.v.number = strtonum(buf, LLONG_MIN,
987 			    LLONG_MAX, &errstr);
988 			if (errstr) {
989 				yyerror("\"%s\" invalid number: %s",
990 				    buf, errstr);
991 				return findeol();
992 			}
993 			return NUM;
994 		} else {
995 nodigits:
996 			while (p > buf + 1)
997 				lungetc(*--p);
998 			c = *--p;
999 			if (c == '-')
1000 				return c;
1001 		}
1002 	}
1003 
1004 #define allowed_in_string(x) \
1005 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
1006 	x != '{' && x != '}' && \
1007 	x != '!' && x != '=' && x != '#' && \
1008 	x != ',' && x != ';'))
1009 
1010 	if (isalnum(c) || c == ':' || c == '_') {
1011 		do {
1012 			*p++ = c;
1013 			if ((size_t)(p-buf) >= sizeof(buf)) {
1014 				yyerror("string too long");
1015 				return findeol();
1016 			}
1017 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
1018 		lungetc(c);
1019 		*p = '\0';
1020 		if ((token = lookup(buf)) == STRING)
1021 			yylval.v.string = xstrdup(buf);
1022 		return token;
1023 	}
1024 	if (c == '\n') {
1025 		yylval.lineno = file->lineno;
1026 		file->lineno++;
1027 	}
1028 	if (c == EOF)
1029 		return 0;
1030 	return c;
1031 }
1032 
1033 struct file *
1034 pushfile(const char *name, int secret)
1035 {
1036 	struct file	*nfile;
1037 
1038 	nfile = xcalloc(1, sizeof(*nfile));
1039 	nfile->name = xstrdup(name);
1040 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
1041 		log_warn("can't open %s", nfile->name);
1042 		free(nfile->name);
1043 		free(nfile);
1044 		return NULL;
1045 	}
1046 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
1047 	nfile->ungetsize = 16;
1048 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
1049 	TAILQ_INSERT_TAIL(&files, nfile, entry);
1050 	return nfile;
1051 }
1052 
1053 int
1054 popfile(void)
1055 {
1056 	struct file	*prev;
1057 
1058 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
1059 		prev->errors += file->errors;
1060 
1061 	TAILQ_REMOVE(&files, file, entry);
1062 	fclose(file->stream);
1063 	free(file->name);
1064 	free(file->ungetbuf);
1065 	free(file);
1066 	file = prev;
1067 	return file ? 0 : EOF;
1068 }
1069 
1070 int
1071 parse_conf(struct conf *c, const char *filename)
1072 {
1073 	struct sym		*sym, *next;
1074 
1075 	default_host = "*";
1076 	default_port = 1965;
1077 
1078 	conf = c;
1079 
1080 	file = pushfile(filename, 0);
1081 	if (file == NULL)
1082 		return -1;
1083 	topfile = file;
1084 
1085 	yyparse();
1086 	errors = file->errors;
1087 	popfile();
1088 
1089 	/* Free macros and check which have not been used. */
1090 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
1091 		/* TODO: warn if !sym->used */
1092 		if (!sym->persist) {
1093 			free(sym->name);
1094 			free(sym->val);
1095 			TAILQ_REMOVE(&symhead, sym, entry);
1096 			free(sym);
1097 		}
1098 	}
1099 
1100 	if (errors)
1101 		return -1;
1102 	return 0;
1103 }
1104 
1105 int
1106 symset(const char *name, const char *val, int persist)
1107 {
1108 	struct sym *sym;
1109 
1110 	TAILQ_FOREACH(sym, &symhead, entry) {
1111 		if (!strcmp(name, sym->name))
1112 			break;
1113 	}
1114 
1115 	if (sym != NULL) {
1116 		if (sym->persist)
1117 			return 0;
1118 		else {
1119 			free(sym->name);
1120 			free(sym->val);
1121 			TAILQ_REMOVE(&symhead, sym, entry);
1122 			free(sym);
1123 		}
1124 	}
1125 
1126 	sym = xcalloc(1, sizeof(*sym));
1127 	sym->name = xstrdup(name);
1128 	sym->val = xstrdup(val);
1129 	sym->used = 0;
1130 	sym->persist = persist;
1131 
1132 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1133 	return 0;
1134 }
1135 
1136 int
1137 cmdline_symset(char *s)
1138 {
1139 	char	*sym, *val;
1140 	int	 ret;
1141 
1142 	if ((val = strrchr(s, '=')) == NULL)
1143 		return -1;
1144 	sym = xcalloc(1, val - s + 1);
1145 	memcpy(sym, s, val - s);
1146 	ret = symset(sym, val + 1, 1);
1147 	free(sym);
1148 	return ret;
1149 }
1150 
1151 char *
1152 symget(const char *nam)
1153 {
1154 	struct sym	*sym;
1155 
1156 	TAILQ_FOREACH(sym, &symhead, entry) {
1157 		if (strcmp(nam, sym->name) == 0) {
1158 			sym->used = 1;
1159 			return sym->val;
1160 		}
1161 	}
1162 	return NULL;
1163 }
1164 
1165 char *
1166 ensure_absolute_path(char *path)
1167 {
1168 	if (path == NULL || *path != '/')
1169 		yyerror("not an absolute path: %s", path);
1170 	return path;
1171 }
1172 
1173 int
1174 check_block_code(int n)
1175 {
1176 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1177 		yyerror("invalid block code %d", n);
1178 	return n;
1179 }
1180 
1181 char *
1182 check_block_fmt(char *fmt)
1183 {
1184 	char *s;
1185 
1186 	for (s = fmt; *s; ++s) {
1187 		if (*s != '%')
1188 			continue;
1189 		switch (*++s) {
1190 		case '%':
1191 		case 'p':
1192 		case 'q':
1193 		case 'P':
1194 		case 'N':
1195 			break;
1196 		default:
1197 			yyerror("invalid format specifier %%%c", *s);
1198 		}
1199 	}
1200 
1201 	return fmt;
1202 }
1203 
1204 int
1205 check_strip_no(int n)
1206 {
1207 	if (n <= 0)
1208 		yyerror("invalid strip number %d", n);
1209 	return n;
1210 }
1211 
1212 int
1213 check_port_num(int n)
1214 {
1215 	if (n <= 0 || n >= UINT16_MAX)
1216 		yyerror("port number is %s: %d",
1217 		    n <= 0 ? "too small" : "too large",
1218 		    n);
1219 	return n;
1220 }
1221 
1222 int
1223 check_prefork_num(int n)
1224 {
1225 	if (n <= 0 || n >= PROC_MAX_INSTANCES)
1226 		yyerror("invalid prefork number %d", n);
1227 	return n;
1228 }
1229 
1230 void
1231 advance_loc(void)
1232 {
1233 	loc = new_location();
1234 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1235 }
1236 
1237 void
1238 advance_proxy(void)
1239 {
1240 	proxy = new_proxy();
1241 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1242 }
1243 
1244 void
1245 parsehp(char *str, char **host, const char **port, const char *def)
1246 {
1247 	char		*at;
1248 	const char	*errstr;
1249 
1250 	*host = str;
1251 
1252 	if ((at = strchr(str, ':')) != NULL) {
1253 		*at++ = '\0';
1254 		*port = at;
1255 	} else
1256 		*port = def;
1257 
1258 	strtonum(*port, 1, UINT16_MAX, &errstr);
1259 	if (errstr != NULL)
1260 		yyerror("port is %s: %s", errstr, *port);
1261 }
1262 
1263 int
1264 fastcgi_conf(const char *path, const char *port)
1265 {
1266 	struct fcgi	*f;
1267 	int		i = 0;
1268 
1269 	TAILQ_FOREACH(f, &conf->fcgi, fcgi) {
1270 		if (!strcmp(f->path, path) &&
1271 		    ((port == NULL && *f->port == '\0') ||
1272 		     !strcmp(f->port, port)))
1273 			return i;
1274 		++i;
1275 	}
1276 
1277 	f = xcalloc(1, sizeof(*f));
1278 	f->id = i;
1279 	(void)strlcpy(f->path, path, sizeof(f->path));
1280 	if (port != NULL)
1281 		(void)strlcpy(f->port, port, sizeof(f->port));
1282 	TAILQ_INSERT_TAIL(&conf->fcgi, f, fcgi);
1283 
1284 	return f->id;
1285 }
1286 
1287 void
1288 add_param(char *name, char *val)
1289 {
1290 	struct envlist *e;
1291 	struct envhead *h = &loc->params;
1292 
1293 	e = xcalloc(1, sizeof(*e));
1294 	(void) strlcpy(e->name, name, sizeof(e->name));
1295 	(void) strlcpy(e->value, val, sizeof(e->value));
1296 	TAILQ_INSERT_TAIL(h, e, envs);
1297 }
1298 
1299 int
1300 getservice(const char *n)
1301 {
1302 	struct servent	*s;
1303 	const char	*errstr;
1304 	long long	 llval;
1305 
1306 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1307 	if (errstr) {
1308 		s = getservbyname(n, "tcp");
1309 		if (s == NULL)
1310 			s = getservbyname(n, "udp");
1311 		if (s == NULL)
1312 			return (-1);
1313 		return (ntohs(s->s_port));
1314 	}
1315 
1316 	return ((unsigned short)llval);
1317 }
1318 
1319 static void
1320 add_to_addr_queue(struct addrhead *a, struct addrinfo *ai)
1321 {
1322 	struct address		*addr;
1323 	struct sockaddr_in	*sin;
1324 	struct sockaddr_in6	*sin6;
1325 
1326 	if (ai->ai_addrlen > sizeof(addr->ss))
1327 		fatalx("ai_addrlen larger than a sockaddr_storage");
1328 
1329 	TAILQ_FOREACH(addr, a, addrs) {
1330 		if (addr->ai_flags == ai->ai_flags &&
1331 		    addr->ai_family == ai->ai_family &&
1332 		    addr->ai_socktype == ai->ai_socktype &&
1333 		    addr->ai_protocol == ai->ai_protocol &&
1334 		    addr->slen == ai->ai_addrlen &&
1335 		    !memcmp(&addr->ss, ai->ai_addr, addr->slen))
1336 			return;
1337 	}
1338 
1339 	addr = xcalloc(1, sizeof(*addr));
1340 	addr->ai_flags = ai->ai_flags;
1341 	addr->ai_family = ai->ai_family;
1342 	addr->ai_socktype = ai->ai_socktype;
1343 	addr->ai_protocol = ai->ai_protocol;
1344 	addr->slen = ai->ai_addrlen;
1345 	memcpy(&addr->ss, ai->ai_addr, ai->ai_addrlen);
1346 
1347 	/* for commodity */
1348 	switch (addr->ai_family) {
1349 	case AF_INET:
1350 		sin = (struct sockaddr_in *)&addr->ss;
1351 		addr->port = ntohs(sin->sin_port);
1352 		break;
1353 	case AF_INET6:
1354 		sin6 = (struct sockaddr_in6 *)&addr->ss;
1355 		addr->port = ntohs(sin6->sin6_port);
1356 		break;
1357 	default:
1358 		fatalx("unknown socket family %d", addr->ai_family);
1359 	}
1360 
1361 	addr->sock = -1;
1362 
1363 	TAILQ_INSERT_HEAD(a, addr, addrs);
1364 }
1365 
1366 void
1367 listen_on(const char *hostname, const char *servname)
1368 {
1369 	struct addrinfo hints, *res, *res0;
1370 	int error;
1371 
1372 	memset(&hints, 0, sizeof(hints));
1373 	hints.ai_family = AF_UNSPEC;
1374 	hints.ai_socktype = SOCK_STREAM;
1375 	hints.ai_flags = AI_PASSIVE;
1376 	error = getaddrinfo(hostname, servname, &hints, &res0);
1377 	if (error) {
1378 		yyerror("listen on \"%s\" port %s: %s", hostname, servname,
1379 		    gai_strerror(errno));
1380 		return;
1381 	}
1382 
1383 	for (res = res0; res; res = res->ai_next) {
1384 		add_to_addr_queue(&host->addrs, res);
1385 		add_to_addr_queue(&conf->addrs, res);
1386 	}
1387 
1388 	freeaddrinfo(res0);
1389 }