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 = 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_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 nl
154 		| conf varset nl
155 		| conf option nl
156 		| conf vhost nl
157 		| conf types nl
158 		| conf error nl		{ 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 = NULL;
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		: ACCESS string		{
264 			free(conf->log_access);
265 			conf->log_access = $2;
266 		}
267 		| STYLE COMMON		{
268 			conf->log_format = LOG_FORMAT_COMMON;
269 		}
270 		| STYLE COMBINED	{
271 			conf->log_format = LOG_FORMAT_COMBINED;
272 		}
273 		| STYLE CONDENSED	{
274 			conf->log_format = LOG_FORMAT_CONDENSED;
275 		}
276 		| STYLE LEGACY		{
277 			conf->log_format = LOG_FORMAT_LEGACY;
278 		}
279 		| SYSLOG FACILITY string {
280 			const char *str = $3;
281 
282 			conf->log_syslog = 1;
283 
284 			if (!strncasecmp(str, "LOG_", 4))
285 				str += 4;
286 
287 			if (!strcasecmp(str, "daemon"))
288 				conf->log_facility = LOG_DAEMON;
289 #ifdef LOG_FTP
290 			else if (!strcasecmp(str, "ftp"))
291 				conf->log_facility = LOG_FTP;
292 #endif
293 			else if (!strcasecmp(str, "local1"))
294 				conf->log_facility = LOG_LOCAL1;
295 			else if (!strcasecmp(str, "local2"))
296 				conf->log_facility = LOG_LOCAL2;
297 			else if (!strcasecmp(str, "local3"))
298 				conf->log_facility = LOG_LOCAL3;
299 			else if (!strcasecmp(str, "local4"))
300 				conf->log_facility = LOG_LOCAL4;
301 			else if (!strcasecmp(str, "local5"))
302 				conf->log_facility = LOG_LOCAL5;
303 			else if (!strcasecmp(str, "local6"))
304 				conf->log_facility = LOG_LOCAL6;
305 			else if (!strcasecmp(str, "local7"))
306 				conf->log_facility = LOG_LOCAL7;
307 			else if (!strcasecmp(str, "user"))
308 				conf->log_facility = LOG_USER;
309 			else
310 				yywarn("unknown syslog facility `%s'",
311 				    $3);
312 
313 			free($3);
314 		}
315 		| SYSLOG OFF		{
316 			conf->log_syslog = 0;
317 		}
318 		| SYSLOG		{
319 			conf->log_syslog = 1;
320 		}
321 		;
322 
323 vhost		: SERVER string {
324 			host = new_vhost();
325 			TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
326 
327 			loc = new_location();
328 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
329 
330 			TAILQ_INIT(&host->proxies);
331 
332 			(void) strlcpy(loc->match, "*", sizeof(loc->match));
333 			(void) strlcpy(host->domain, $2, sizeof(host->domain));
334 
335 			if (strstr($2, "xn--") != NULL) {
336 				yywarn("\"%s\" looks like punycode: you "
337 				    "should use the decoded hostname", $2);
338 			}
339 
340 			free($2);
341 		} '{' optnl servbody '}' {
342 			if (host->cert_path == NULL ||
343 			    host->key_path == NULL)
344 				yyerror("invalid vhost definition: %s",
345 				    host->domain);
346 			if (TAILQ_EMPTY(&host->addrs)) {
347 				char portno[32];
348 				int r;
349 
350 				r = snprintf(portno, sizeof(portno), "%d",
351 				    default_port);
352 				if (r < 0 || (size_t)r >= sizeof(portno))
353 					fatal("snprintf");
354 
355 				yywarn("missing `listen on' in server %s,"
356 				    " assuming %s port %d", host->domain,
357 				    default_host ? 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	: '*' { $$ = NULL; }
372 		| STRING
373 		;
374 
375 servopt		: ALIAS string {
376 			struct alist *a;
377 
378 			a = xcalloc(1, sizeof(*a));
379 			(void) strlcpy(a->alias, $2, sizeof(a->alias));
380 			free($2);
381 			TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
382 		}
383 		| CERT string		{
384 			ensure_absolute_path($2);
385 			free(host->cert_path);
386 			host->cert_path = $2;
387 		}
388 		| KEY string		{
389 			ensure_absolute_path($2);
390 			free(host->key_path);
391 			host->key_path = $2;
392 		}
393 		| OCSP string		{
394 			ensure_absolute_path($2);
395 			free(host->ocsp_path);
396 			host->ocsp_path = $2;
397 		}
398 		| PARAM string '=' string {
399 			yywarn("the top-level `param' directive is deprecated."
400 			    "  Please use `fastcgi { param ... }`");
401 			add_param($2, $4);
402 		}
403 		| LISTEN ON listen_addr {
404 			listen_on($3, "1965");
405 			free($3);
406 		}
407 		| LISTEN ON listen_addr PORT STRING {
408 			listen_on($3, $5);
409 			free($3);
410 			free($5);
411 		}
412 		| LISTEN ON listen_addr PORT NUM {
413 			char portno[32];
414 			int r;
415 
416 			r = snprintf(portno, sizeof(portno), "%d", $5);
417 			if (r < 0 || (size_t)r >= sizeof(portno))
418 				fatal("snprintf");
419 
420 			listen_on($3, portno);
421 			free($3);
422 		}
423 		| locopt
424 		;
425 
426 proxy		: PROXY { advance_proxy(); }
427 		  proxy_matches '{' optnl proxy_opts '}' {
428 			if (*proxy->host == '\0')
429 				yyerror("invalid proxy block: missing `relay-to' option");
430 
431 			if ((proxy->cert_path == NULL && proxy->key_path != NULL) ||
432 			    (proxy->cert_path != NULL && proxy->key_path == NULL))
433 				yyerror("invalid proxy block: missing cert or key");
434 		}
435 		;
436 
437 proxy_matches	: /* empty */
438 		| proxy_matches proxy_match
439 		;
440 
441 proxy_port	: /* empty */	{ $$ = 1965; }
442 		| PORT STRING {
443 			if (($$ = getservice($2)) == -1)
444 				yyerror("invalid port number %s", $2);
445 			free($2);
446 		}
447 		| PORT NUM	{ $$ = $2; }
448 		;
449 
450 proxy_match	: PROTO string {
451 			(void) strlcpy(proxy->match_proto, $2, sizeof(proxy->match_proto));
452 			free($2);
453 		}
454 		| FOR_HOST string proxy_port {
455 			(void) strlcpy(proxy->match_host, $2, sizeof(proxy->match_host));
456 			(void) snprintf(proxy->match_port, sizeof(proxy->match_port),
457 			    "%d", $3);
458 			free($2);
459 		}
460 		;
461 
462 proxy_opts	: /* empty */
463 		| proxy_opts proxy_opt optnl
464 		;
465 
466 proxy_opt	: CERT string {
467 			free(proxy->cert);
468 			ensure_absolute_path($2);
469 			proxy->cert_path = $2;
470 		}
471 		| KEY string {
472 			free(proxy->key);
473 			ensure_absolute_path($2);
474 			proxy->key_path = $2;
475 		}
476 		| PROTOCOLS string {
477 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
478 				yyerror("invalid protocols string \"%s\"", $2);
479 			free($2);
480 		}
481 		| RELAY_TO string proxy_port {
482 			(void) strlcpy(proxy->host, $2, sizeof(proxy->host));
483 			(void) snprintf(proxy->port, sizeof(proxy->port),
484 			    "%d", $3);
485 			free($2);
486 		}
487 		| REQUIRE CLIENT CA string {
488 			ensure_absolute_path($4);
489 			proxy->reqca_path = $4;
490 		}
491 		| SNI string {
492 			(void) strlcpy(proxy->sni, $2, sizeof(proxy->sni));
493 			free($2);
494 		}
495 		| USE_TLS bool {
496 			proxy->notls = !$2;
497 		}
498 		| VERIFYNAME bool {
499 			proxy->noverifyname = !$2;
500 		}
501 		;
502 
503 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
504 			/* drop the starting '/' if any */
505 			if (*$3 == '/')
506 				memmove($3, $3+1, strlen($3));
507 			(void) strlcpy(loc->match, $3, sizeof(loc->match));
508 			free($3);
509 		}
510 		| error '}'
511 		;
512 
513 locopts		: /* empty */
514 		| locopts locopt optnl
515 		;
516 
517 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
518 		| BLOCK RETURN NUM string {
519 			check_block_fmt($4);
520 			(void) strlcpy(loc->block_fmt, $4, sizeof(loc->block_fmt));
521 			loc->block_code = check_block_code($3);
522 			free($4);
523 		}
524 		| BLOCK RETURN NUM {
525 			(void) strlcpy(loc->block_fmt, "temporary failure",
526 			    sizeof(loc->block_fmt));
527 			loc->block_code = check_block_code($3);
528 			if ($3 >= 30 && $3 < 40)
529 				yyerror("missing `meta' for block return %d", $3);
530 		}
531 		| BLOCK {
532 			(void) strlcpy(loc->block_fmt, "temporary failure",
533 			    sizeof(loc->block_fmt));
534 			loc->block_code = 40;
535 		}
536 		| DEFAULT TYPE string {
537 			(void) strlcpy(loc->default_mime, $3,
538 			    sizeof(loc->default_mime));
539 			free($3);
540 		}
541 		| fastcgi
542 		| INDEX string {
543 			(void) strlcpy(loc->index, $2, sizeof(loc->index));
544 			free($2);
545 		}
546 		| LANG string {
547 			(void) strlcpy(loc->lang, $2,
548 			    sizeof(loc->lang));
549 			free($2);
550 		}
551 		| LOG bool	{ loc->disable_log = !$2; }
552 		| REQUIRE CLIENT CA string {
553 			ensure_absolute_path($4);
554 			loc->reqca_path = $4;
555 		}
556 		| ROOT string		{
557 			(void) strlcpy(loc->dir, $2, sizeof(loc->dir));
558 			free($2);
559 		}
560 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
561 		;
562 
563 fastcgi		: FASTCGI '{' optnl fastcgiopts '}'
564 		| FASTCGI fastcgiopt
565 		| FASTCGI OFF {
566 			loc->fcgi = -1;
567 			loc->nofcgi = 1;
568 		}
569 		| FASTCGI string {
570 			yywarn("`fastcgi path' is deprecated.  "
571 			    "Please use `fastcgi socket path' instead.");
572 			loc->fcgi = fastcgi_conf($2, NULL);
573 			free($2);
574 		}
575 		;
576 
577 fastcgiopts	: /* empty */
578 		| fastcgiopts fastcgiopt optnl
579 		;
580 
581 fastcgiopt	: PARAM string '=' string {
582 			add_param($2, $4);
583 		}
584 		| SOCKET string {
585 			loc->fcgi = fastcgi_conf($2, NULL);
586 			free($2);
587 		}
588 		| SOCKET TCP string PORT NUM {
589 			char *c;
590 
591 			if (asprintf(&c, "%d", $5) == -1)
592 				fatal("asprintf");
593 			loc->fcgi = fastcgi_conf($3, c);
594 			free($3);
595 			free(c);
596 		}
597 		| SOCKET TCP string {
598 			loc->fcgi = fastcgi_conf($3, "9000");
599 		}
600 		| SOCKET TCP string PORT string {
601 			loc->fcgi = fastcgi_conf($3, $5);
602 			free($3);
603 			free($5);
604 		}
605 		| STRIP NUM {
606 			loc->fcgi_strip = $2;
607 		}
608 		;
609 
610 types		: TYPES '{' optnl mediaopts_l '}' ;
611 
612 mediaopts_l	: mediaopts_l mediaoptsl nl
613 		| mediaoptsl nl
614 		;
615 
616 mediaoptsl	: STRING {
617 			free(current_media);
618 			current_media = $1;
619 		} medianames_l
620 		| include
621 		;
622 
623 medianames_l	: medianames_l medianamesl
624 		| medianamesl
625 		;
626 
627 medianamesl	: numberstring {
628 			if (add_mime(&conf->mime, current_media, $1) == -1)
629 				fatal("add_mime");
630 			free($1);
631 		}
632 		;
633 
634 nl		: '\n' optnl
635 		| ';' optnl
636 		;
637 
638 optnl		: nl
639 		| /*empty*/
640 		;
641 
642 %%
643 
644 static const struct keyword {
645 	const char *word;
646 	int token;
647 } keywords[] = {
648 	/* these MUST be sorted */
649 	{"access", ACCESS},
650 	{"alias", ALIAS},
651 	{"auto", AUTO},
652 	{"block", BLOCK},
653 	{"ca", CA},
654 	{"cert", CERT},
655 	{"chroot", CHROOT},
656 	{"client", CLIENT},
657 	{"combined", COMBINED},
658 	{"common", COMMON},
659 	{"condensed", CONDENSED},
660 	{"default", DEFAULT},
661 	{"facility", FACILITY},
662 	{"fastcgi", FASTCGI},
663 	{"for-host", FOR_HOST},
664 	{"include", INCLUDE},
665 	{"index", INDEX},
666 	{"ipv6", IPV6},
667 	{"key", KEY},
668 	{"lang", LANG},
669 	{"legacy", LEGACY},
670 	{"listen", LISTEN},
671 	{"location", LOCATION},
672 	{"log", LOG},
673 	{"ocsp", OCSP},
674 	{"off", OFF},
675 	{"on", ON},
676 	{"param", PARAM},
677 	{"port", PORT},
678 	{"prefork", PREFORK},
679 	{"proto", PROTO},
680 	{"protocols", PROTOCOLS},
681 	{"proxy", PROXY},
682 	{"relay-to", RELAY_TO},
683 	{"require", REQUIRE},
684 	{"return", RETURN},
685 	{"root", ROOT},
686 	{"server", SERVER},
687 	{"sni", SNI},
688 	{"socket", SOCKET},
689 	{"strip", STRIP},
690 	{"style", STYLE},
691 	{"syslog", SYSLOG},
692 	{"tcp", TCP},
693 	{"to-ext", TOEXT},
694 	{"type", TYPE},
695 	{"types", TYPES},
696 	{"use-tls", USE_TLS},
697 	{"user", USER},
698 	{"verifyname", VERIFYNAME},
699 };
700 
701 void
702 yyerror(const char *msg, ...)
703 {
704 	va_list ap;
705 
706 	file->errors++;
707 
708 	va_start(ap, msg);
709 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
710 	vfprintf(stderr, msg, ap);
711 	fprintf(stderr, "\n");
712 	va_end(ap);
713 }
714 
715 void
716 yywarn(const char *msg, ...)
717 {
718 	va_list ap;
719 
720 	va_start(ap, msg);
721 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
722 	vfprintf(stderr, msg, ap);
723 	fprintf(stderr, "\n");
724 	va_end(ap);
725 }
726 
727 int
728 kw_cmp(const void *k, const void *e)
729 {
730 	return strcmp(k, ((struct keyword *)e)->word);
731 }
732 
733 int
734 lookup(char *s)
735 {
736 	const struct keyword	*p;
737 
738 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
739 	    sizeof(keywords[0]), kw_cmp);
740 
741 	if (p)
742 		return p->token;
743 	else
744 		return STRING;
745 }
746 
747 #define START_EXPAND	1
748 #define DONE_EXPAND	2
749 
750 static int	expanding;
751 
752 int
753 igetc(void)
754 {
755 	int	c;
756 
757 	while (1) {
758 		if (file->ungetpos > 0)
759 			c = file->ungetbuf[--file->ungetpos];
760 		else
761 			c = getc(file->stream);
762 
763 		if (c == START_EXPAND)
764 			expanding = 1;
765 		else if (c == DONE_EXPAND)
766 			expanding = 0;
767 		else
768 			break;
769 	}
770 	return c;
771 }
772 
773 int
774 lgetc(int quotec)
775 {
776 	int		c, next;
777 
778 	if (quotec) {
779 		if ((c = igetc()) == EOF) {
780 			yyerror("reached end of file while parsing "
781 			    "quoted string");
782 			if (file == topfile || popfile() == EOF)
783 				return EOF;
784 			return quotec;
785 		}
786 		return c;
787 	}
788 
789 	while ((c = igetc()) == '\\') {
790 		next = igetc();
791 		if (next != '\n') {
792 			c = next;
793 			break;
794 		}
795 		yylval.lineno = file->lineno;
796 		file->lineno++;
797 	}
798 
799 	if (c == EOF) {
800 		/*
801 		 * Fake EOL when hit EOF for the first time. This gets line
802 		 * count right if last line in included file is syntactically
803 		 * invalid and has no newline.
804 		 */
805 		if (file->eof_reached == 0) {
806 			file->eof_reached = 1;
807 			return '\n';
808 		}
809 		while (c == EOF) {
810 			if (file == topfile || popfile() == EOF)
811 				return EOF;
812 			c = igetc();
813 		}
814 	}
815 	return c;
816 }
817 
818 void
819 lungetc(int c)
820 {
821 	if (c == EOF)
822 		return;
823 
824 	if (file->ungetpos >= file->ungetsize) {
825 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
826 		if (p == NULL)
827 			fatal("lungetc");
828 		file->ungetbuf = p;
829 		file->ungetsize *= 2;
830 	}
831 	file->ungetbuf[file->ungetpos++] = c;
832 }
833 
834 int
835 findeol(void)
836 {
837 	int	c;
838 
839 	/* Skip to either EOF or the first real EOL. */
840 	while (1) {
841 		c = lgetc(0);
842 		if (c == '\n') {
843 			file->lineno++;
844 			break;
845 		}
846 		if (c == EOF)
847 			break;
848 	}
849 	return ERROR;
850 }
851 
852 int
853 yylex(void)
854 {
855 	char	 buf[8096];
856 	char	*p, *val;
857 	int	 quotec, next, c;
858 	int	 token;
859 
860 top:
861 	p = buf;
862 	while ((c = lgetc(0)) == ' ' || c == '\t')
863 		; /* nothing */
864 
865 	yylval.lineno = file->lineno;
866 	if (c == '#')
867 		while ((c = lgetc(0)) != '\n' && c != EOF)
868 			; /* nothing */
869 	if (c == '$' && !expanding) {
870 		while (1) {
871 			if ((c = lgetc(0)) == EOF)
872 				return 0;
873 			if (p + 1 >= buf + sizeof(buf) -1) {
874 				yyerror("string too long");
875 				return findeol();
876 			}
877 			if (isalnum(c) || c == '_') {
878 				*p++ = c;
879 				continue;
880 			}
881 			*p = '\0';
882 			lungetc(c);
883 			break;
884 		}
885 		val = symget(buf);
886 		if (val == NULL) {
887 			yyerror("macro `%s' not defined", buf);
888 			return findeol();
889 		}
890 		yylval.v.string = xstrdup(val);
891 		return STRING;
892 	}
893 	if (c == '@' && !expanding) {
894 		while (1) {
895 			if ((c = lgetc(0)) == EOF)
896 				return 0;
897 
898 			if (p + 1 >= buf + sizeof(buf) - 1) {
899 				yyerror("string too long");
900 				return findeol();
901 			}
902 			if (isalnum(c) || c == '_') {
903 				*p++ = c;
904 				continue;
905 			}
906 			*p = '\0';
907 			lungetc(c);
908 			break;
909 		}
910 		val = symget(buf);
911 		if (val == NULL) {
912 			yyerror("macro '%s' not defined", buf);
913 			return findeol();
914 		}
915 		p = val + strlen(val) - 1;
916 		lungetc(DONE_EXPAND);
917 		while (p >= val) {
918 			lungetc(*p);
919 			p--;
920 		}
921 		lungetc(START_EXPAND);
922 		goto top;
923 	}
924 
925 	switch (c) {
926 	case '\'':
927 	case '"':
928 		quotec = c;
929 		while (1) {
930 			if ((c = lgetc(quotec)) == EOF)
931 				return 0;
932 			if (c == '\n') {
933 				file->lineno++;
934 				continue;
935 			} else if (c == '\\') {
936 				if ((next = lgetc(quotec)) == EOF)
937 					return (0);
938 				if (next == quotec || next == ' ' ||
939 				    next == '\t')
940 					c = next;
941 				else if (next == '\n') {
942 					file->lineno++;
943 					continue;
944 				} else
945 					lungetc(next);
946 			} else if (c == quotec) {
947 				*p = '\0';
948 				break;
949 			} else if (c == '\0') {
950 				yyerror("invalid syntax");
951 				return findeol();
952 			}
953 			if (p + 1 >= buf + sizeof(buf) - 1) {
954 				yyerror("string too long");
955 				return findeol();
956 			}
957 			*p++ = c;
958 		}
959 		yylval.v.string = strdup(buf);
960 		if (yylval.v.string == NULL)
961 			fatal("yylex: strdup");
962 		return STRING;
963 	}
964 
965 #define allowed_to_end_number(x) \
966 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
967 
968 	if (c == '-' || isdigit(c)) {
969 		do {
970 			*p++ = c;
971 			if ((size_t)(p-buf) >= sizeof(buf)) {
972 				yyerror("string too long");
973 				return findeol();
974 			}
975 		} while ((c = lgetc(0)) != EOF && isdigit(c));
976 		lungetc(c);
977 		if (p == buf + 1 && buf[0] == '-')
978 			goto nodigits;
979 		if (c == EOF || allowed_to_end_number(c)) {
980 			const char *errstr = NULL;
981 
982 			*p = '\0';
983 			yylval.v.number = strtonum(buf, LLONG_MIN,
984 			    LLONG_MAX, &errstr);
985 			if (errstr) {
986 				yyerror("\"%s\" invalid number: %s",
987 				    buf, errstr);
988 				return findeol();
989 			}
990 			return NUM;
991 		} else {
992 nodigits:
993 			while (p > buf + 1)
994 				lungetc(*--p);
995 			c = *--p;
996 			if (c == '-')
997 				return c;
998 		}
999 	}
1000 
1001 #define allowed_in_string(x) \
1002 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
1003 	x != '{' && x != '}' && \
1004 	x != '!' && x != '=' && x != '#' && \
1005 	x != ',' && x != ';'))
1006 
1007 	if (isalnum(c) || c == ':' || c == '_') {
1008 		do {
1009 			*p++ = c;
1010 			if ((size_t)(p-buf) >= sizeof(buf)) {
1011 				yyerror("string too long");
1012 				return findeol();
1013 			}
1014 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
1015 		lungetc(c);
1016 		*p = '\0';
1017 		if ((token = lookup(buf)) == STRING)
1018 			yylval.v.string = xstrdup(buf);
1019 		return token;
1020 	}
1021 	if (c == '\n') {
1022 		yylval.lineno = file->lineno;
1023 		file->lineno++;
1024 	}
1025 	if (c == EOF)
1026 		return 0;
1027 	return c;
1028 }
1029 
1030 struct file *
1031 pushfile(const char *name, int secret)
1032 {
1033 	struct file	*nfile;
1034 
1035 	nfile = xcalloc(1, sizeof(*nfile));
1036 	nfile->name = xstrdup(name);
1037 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
1038 		log_warn("can't open %s", nfile->name);
1039 		free(nfile->name);
1040 		free(nfile);
1041 		return NULL;
1042 	}
1043 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
1044 	nfile->ungetsize = 16;
1045 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
1046 	TAILQ_INSERT_TAIL(&files, nfile, entry);
1047 	return nfile;
1048 }
1049 
1050 int
1051 popfile(void)
1052 {
1053 	struct file	*prev;
1054 
1055 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
1056 		prev->errors += file->errors;
1057 
1058 	TAILQ_REMOVE(&files, file, entry);
1059 	fclose(file->stream);
1060 	free(file->name);
1061 	free(file->ungetbuf);
1062 	free(file);
1063 	file = prev;
1064 	return file ? 0 : EOF;
1065 }
1066 
1067 int
1068 parse_conf(struct conf *c, const char *filename)
1069 {
1070 	struct sym		*sym, *next;
1071 
1072 	default_host = NULL;
1073 	default_port = 1965;
1074 
1075 	conf = c;
1076 
1077 	file = pushfile(filename, 0);
1078 	if (file == NULL)
1079 		return -1;
1080 	topfile = file;
1081 
1082 	yyparse();
1083 	errors = file->errors;
1084 	popfile();
1085 
1086 	/* Free macros and check which have not been used. */
1087 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
1088 		/* TODO: warn if !sym->used */
1089 		if (!sym->persist) {
1090 			free(sym->name);
1091 			free(sym->val);
1092 			TAILQ_REMOVE(&symhead, sym, entry);
1093 			free(sym);
1094 		}
1095 	}
1096 
1097 	if (errors)
1098 		return -1;
1099 	return 0;
1100 }
1101 
1102 int
1103 symset(const char *name, const char *val, int persist)
1104 {
1105 	struct sym *sym;
1106 
1107 	TAILQ_FOREACH(sym, &symhead, entry) {
1108 		if (!strcmp(name, sym->name))
1109 			break;
1110 	}
1111 
1112 	if (sym != NULL) {
1113 		if (sym->persist)
1114 			return 0;
1115 		else {
1116 			free(sym->name);
1117 			free(sym->val);
1118 			TAILQ_REMOVE(&symhead, sym, entry);
1119 			free(sym);
1120 		}
1121 	}
1122 
1123 	sym = xcalloc(1, sizeof(*sym));
1124 	sym->name = xstrdup(name);
1125 	sym->val = xstrdup(val);
1126 	sym->used = 0;
1127 	sym->persist = persist;
1128 
1129 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1130 	return 0;
1131 }
1132 
1133 int
1134 cmdline_symset(char *s)
1135 {
1136 	char	*sym, *val;
1137 	int	 ret;
1138 
1139 	if ((val = strrchr(s, '=')) == NULL)
1140 		return -1;
1141 	sym = xcalloc(1, val - s + 1);
1142 	memcpy(sym, s, val - s);
1143 	ret = symset(sym, val + 1, 1);
1144 	free(sym);
1145 	return ret;
1146 }
1147 
1148 char *
1149 symget(const char *nam)
1150 {
1151 	struct sym	*sym;
1152 
1153 	TAILQ_FOREACH(sym, &symhead, entry) {
1154 		if (strcmp(nam, sym->name) == 0) {
1155 			sym->used = 1;
1156 			return sym->val;
1157 		}
1158 	}
1159 	return NULL;
1160 }
1161 
1162 char *
1163 ensure_absolute_path(char *path)
1164 {
1165 	if (path == NULL || *path != '/')
1166 		yyerror("not an absolute path: %s", path);
1167 	return path;
1168 }
1169 
1170 int
1171 check_block_code(int n)
1172 {
1173 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1174 		yyerror("invalid block code %d", n);
1175 	return n;
1176 }
1177 
1178 char *
1179 check_block_fmt(char *fmt)
1180 {
1181 	char *s;
1182 
1183 	for (s = fmt; *s; ++s) {
1184 		if (*s != '%')
1185 			continue;
1186 		switch (*++s) {
1187 		case '%':
1188 		case 'p':
1189 		case 'q':
1190 		case 'P':
1191 		case 'N':
1192 			break;
1193 		default:
1194 			yyerror("invalid format specifier %%%c", *s);
1195 		}
1196 	}
1197 
1198 	return fmt;
1199 }
1200 
1201 int
1202 check_strip_no(int n)
1203 {
1204 	if (n <= 0)
1205 		yyerror("invalid strip number %d", n);
1206 	return n;
1207 }
1208 
1209 int
1210 check_port_num(int n)
1211 {
1212 	if (n <= 0 || n >= UINT16_MAX)
1213 		yyerror("port number is %s: %d",
1214 		    n <= 0 ? "too small" : "too large",
1215 		    n);
1216 	return n;
1217 }
1218 
1219 int
1220 check_prefork_num(int n)
1221 {
1222 	if (n <= 0 || n >= PROC_MAX_INSTANCES)
1223 		yyerror("invalid prefork number %d", n);
1224 	return n;
1225 }
1226 
1227 void
1228 advance_loc(void)
1229 {
1230 	loc = new_location();
1231 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1232 }
1233 
1234 void
1235 advance_proxy(void)
1236 {
1237 	proxy = new_proxy();
1238 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1239 }
1240 
1241 void
1242 parsehp(char *str, char **host, const char **port, const char *def)
1243 {
1244 	char		*at;
1245 	const char	*errstr;
1246 
1247 	*host = str;
1248 
1249 	if ((at = strchr(str, ':')) != NULL) {
1250 		*at++ = '\0';
1251 		*port = at;
1252 	} else
1253 		*port = def;
1254 
1255 	strtonum(*port, 1, UINT16_MAX, &errstr);
1256 	if (errstr != NULL)
1257 		yyerror("port is %s: %s", errstr, *port);
1258 }
1259 
1260 int
1261 fastcgi_conf(const char *path, const char *port)
1262 {
1263 	struct fcgi	*f;
1264 	int		i = 0;
1265 
1266 	TAILQ_FOREACH(f, &conf->fcgi, fcgi) {
1267 		if (!strcmp(f->path, path) &&
1268 		    ((port == NULL && *f->port == '\0') ||
1269 		     !strcmp(f->port, port)))
1270 			return i;
1271 		++i;
1272 	}
1273 
1274 	f = xcalloc(1, sizeof(*f));
1275 	f->id = i;
1276 	(void)strlcpy(f->path, path, sizeof(f->path));
1277 	if (port != NULL)
1278 		(void)strlcpy(f->port, port, sizeof(f->port));
1279 	TAILQ_INSERT_TAIL(&conf->fcgi, f, fcgi);
1280 
1281 	return f->id;
1282 }
1283 
1284 void
1285 add_param(char *name, char *val)
1286 {
1287 	struct envlist *e;
1288 	struct envhead *h = &loc->params;
1289 
1290 	e = xcalloc(1, sizeof(*e));
1291 	(void) strlcpy(e->name, name, sizeof(e->name));
1292 	(void) strlcpy(e->value, val, sizeof(e->value));
1293 	TAILQ_INSERT_TAIL(h, e, envs);
1294 }
1295 
1296 int
1297 getservice(const char *n)
1298 {
1299 	struct servent	*s;
1300 	const char	*errstr;
1301 	long long	 llval;
1302 
1303 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1304 	if (errstr) {
1305 		s = getservbyname(n, "tcp");
1306 		if (s == NULL)
1307 			s = getservbyname(n, "udp");
1308 		if (s == NULL)
1309 			return (-1);
1310 		return (ntohs(s->s_port));
1311 	}
1312 
1313 	return ((unsigned short)llval);
1314 }
1315 
1316 static void
1317 add_to_addr_queue(struct addrhead *a, struct addrinfo *ai)
1318 {
1319 	struct address		*addr;
1320 	struct sockaddr_in	*sin;
1321 	struct sockaddr_in6	*sin6;
1322 
1323 	if (ai->ai_addrlen > sizeof(addr->ss))
1324 		fatalx("ai_addrlen larger than a sockaddr_storage");
1325 
1326 	TAILQ_FOREACH(addr, a, addrs) {
1327 		if (addr->ai_flags == ai->ai_flags &&
1328 		    addr->ai_family == ai->ai_family &&
1329 		    addr->ai_socktype == ai->ai_socktype &&
1330 		    addr->ai_protocol == ai->ai_protocol &&
1331 		    addr->slen == ai->ai_addrlen &&
1332 		    !memcmp(&addr->ss, ai->ai_addr, addr->slen))
1333 			return;
1334 	}
1335 
1336 	addr = xcalloc(1, sizeof(*addr));
1337 	addr->ai_flags = ai->ai_flags;
1338 	addr->ai_family = ai->ai_family;
1339 	addr->ai_socktype = ai->ai_socktype;
1340 	addr->ai_protocol = ai->ai_protocol;
1341 	addr->slen = ai->ai_addrlen;
1342 	memcpy(&addr->ss, ai->ai_addr, ai->ai_addrlen);
1343 
1344 	/* for commodity */
1345 	switch (addr->ai_family) {
1346 	case AF_INET:
1347 		sin = (struct sockaddr_in *)&addr->ss;
1348 		addr->port = ntohs(sin->sin_port);
1349 		break;
1350 	case AF_INET6:
1351 		sin6 = (struct sockaddr_in6 *)&addr->ss;
1352 		addr->port = ntohs(sin6->sin6_port);
1353 		break;
1354 	default:
1355 		fatalx("unknown socket family %d", addr->ai_family);
1356 	}
1357 
1358 	addr->sock = -1;
1359 
1360 	TAILQ_INSERT_HEAD(a, addr, addrs);
1361 }
1362 
1363 void
1364 listen_on(const char *hostname, const char *servname)
1365 {
1366 	struct addrinfo hints, *res, *res0;
1367 	int error;
1368 
1369 	memset(&hints, 0, sizeof(hints));
1370 	hints.ai_family = AF_UNSPEC;
1371 	hints.ai_socktype = SOCK_STREAM;
1372 	hints.ai_flags = AI_PASSIVE;
1373 	error = getaddrinfo(hostname, servname, &hints, &res0);
1374 	if (error) {
1375 		yyerror("listen on \"%s\" port %s: %s", hostname, servname,
1376 		    gai_strerror(errno));
1377 		return;
1378 	}
1379 
1380 	for (res = res0; res; res = res->ai_next) {
1381 		add_to_addr_queue(&host->addrs, res);
1382 		add_to_addr_queue(&conf->addrs, res);
1383 	}
1384 
1385 	freeaddrinfo(res0);
1386 }