1 %{
2 
3 /*
4  * Copyright (c) 2021, 2022 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 <stdarg.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 
35 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
36 static struct file {
37 	TAILQ_ENTRY(file)	 entry;
38 	FILE			*stream;
39 	char			*name;
40 	size_t	 		 ungetpos;
41 	size_t			 ungetsize;
42 	u_char			*ungetbuf;
43 	int			 eof_reached;
44 	int			 lineno;
45 	int			 errors;
46 } *file, *topfile;
47 
48 struct file	*pushfile(const char *, int);
49 int		 popfile(void);
50 int		 yyparse(void);
51 int		 yylex(void);
52 void		 yyerror(const char *, ...)
53     __attribute__((__format__ (printf, 1, 2)))
54     __attribute__((__nonnull__ (1)));
55 void		 yywarn(const char *, ...)
56     __attribute__((__format__ (printf, 1, 2)))
57     __attribute__((__nonnull__ (1)));
58 int		 kw_cmp(const void *, const void *);
59 int		 lookup(char *);
60 int		 igetc(void);
61 int		 lgetc(int);
62 void		 lungetc(int);
63 int		 findeol(void);
64 
65 /*
66  * #define YYDEBUG 1
67  * int yydebug = 1;
68  */
69 
70 TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
71 struct sym {
72 	TAILQ_ENTRY(sym)	 entry;
73 	int			 used;
74 	int			 persist;
75 	char			*name;
76 	char			*val;
77 };
78 
79 int	 symset(const char *, const char *, int);
80 char	*symget(const char *);
81 
82 struct vhost	*new_vhost(void);
83 struct location	*new_location(void);
84 struct proxy	*new_proxy(void);
85 char		*ensure_absolute_path(char*);
86 int		 check_block_code(int);
87 char		*check_block_fmt(char*);
88 int		 check_strip_no(int);
89 int		 check_port_num(int);
90 int		 check_prefork_num(int);
91 void		 advance_loc(void);
92 void		 advance_proxy(void);
93 void		 parsehp(char *, char **, const char **, const char *);
94 void		 only_once(const void*, const char*);
95 void		 only_oncei(int, const char*);
96 int		 fastcgi_conf(char *, char *, char *);
97 void		 add_param(char *, char *, int);
98 
99 static struct vhost		*host;
100 static struct location		*loc;
101 static struct proxy		*proxy;
102 static int			 errors;
103 
104 typedef struct {
105 	union {
106 		char	*string;
107 		int	 number;
108 	} v;
109 	int lineno;
110 } YYSTYPE;
111 
112 %}
113 
114 /* for bison: */
115 /* %define parse.error verbose */
116 
117 %token	ALIAS AUTO
118 %token	BLOCK
119 %token	CA CERT CGI CHROOT CLIENT
120 %token	DEFAULT
121 %token	ENTRYPOINT ENV
122 %token	FASTCGI FOR_HOST
123 %token	INCLUDE INDEX IPV6
124 %token	KEY
125 %token	LANG LOCATION LOG
126 %token	MAP MIME
127 %token	OCSP OFF ON
128 %token	PARAM PORT PREFORK PROTO PROTOCOLS PROXY
129 %token	RELAY_TO REQUIRE RETURN ROOT
130 %token	SERVER SNI SPAWN STRIP
131 %token	TCP TOEXT TYPE
132 %token	USE_TLS USER
133 %token	VERIFYNAME
134 
135 %token	ERROR
136 
137 %token	<v.string>	STRING
138 %token	<v.number>	NUM
139 
140 %type	<v.number>	bool
141 %type	<v.string>	string
142 
143 %%
144 
145 conf		: /* empty */
146 		| conf include '\n'
147 		| conf '\n'
148 		| conf varset '\n'
149 		| conf option '\n'
150 		| conf vhost '\n'
151 		| conf error '\n'		{ file->errors++; }
152 		;
153 
154 include		: INCLUDE STRING		{
155 			struct file	*nfile;
156 
157 			if ((nfile = pushfile($2, 0)) == NULL) {
158 				yyerror("failed to include file %s", $2);
159 				free($2);
160 				YYERROR;
161 			}
162 			free($2);
163 
164 			file = nfile;
165 			lungetc('\n');
166 		}
167 		;
168 
169 bool		: ON	{ $$ = 1; }
170 		| OFF	{ $$ = 0; }
171 		;
172 
173 string		: string STRING	{
174 			if (asprintf(&$$, "%s%s", $1, $2) == -1) {
175 				free($1);
176 				free($2);
177 				yyerror("string: asprintf: %s", strerror(errno));
178 				YYERROR;
179 			}
180 			free($1);
181 			free($2);
182 		}
183 		| STRING
184 		;
185 
186 varset		: STRING '=' string		{
187 			char *s = $1;
188 			while (*s++) {
189 				if (isspace((unsigned char)*s)) {
190 					yyerror("macro name cannot contain "
191 					    "whitespaces");
192 					free($1);
193 					free($3);
194 					YYERROR;
195 				}
196 			}
197 			symset($1, $3, 0);
198 			free($1);
199 			free($3);
200 		}
201 		;
202 
203 option		: CHROOT string	{ conf.chroot = $2; }
204 		| IPV6 bool		{ conf.ipv6 = $2; }
205 		| MIME STRING string	{
206 			yywarn("`mime MIME EXT' is deprecated and will be "
207 			    "removed in a future version, please use the new "
208 			    "syntax: `map MIME to-ext EXT'");
209 			add_mime(&conf.mime, $2, $3);
210 		}
211 		| MAP string TOEXT string { add_mime(&conf.mime, $2, $4); }
212 		| PORT NUM		{ conf.port = check_port_num($2); }
213 		| PREFORK NUM		{ conf.prefork = check_prefork_num($2); }
214 		| PROTOCOLS string {
215 			if (tls_config_parse_protocols(&conf.protos, $2) == -1)
216 				yyerror("invalid protocols string \"%s\"", $2);
217 			free($2);
218 		}
219 		| USER string		{ conf.user = $2; }
220 		;
221 
222 vhost		: SERVER string {
223 			host = new_vhost();
224 			TAILQ_INSERT_HEAD(&hosts, host, vhosts);
225 
226 			loc = new_location();
227 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
228 
229 			TAILQ_INIT(&host->proxies);
230 
231 			loc->match = xstrdup("*");
232 			host->domain = $2;
233 
234 			if (strstr($2, "xn--") != NULL) {
235 				yywarn("\"%s\" looks like punycode: you "
236 				    "should use the decoded hostname", $2);
237 			}
238 		} '{' optnl servbody '}' {
239 			if (host->cert == NULL || host->key == NULL)
240 				yyerror("invalid vhost definition: %s", $2);
241 		}
242 		| error '}'		{ yyerror("bad server directive"); }
243 		;
244 
245 servbody	: /* empty */
246 		| servbody servopt optnl
247 		| servbody location optnl
248 		| servbody proxy optnl
249 		;
250 
251 servopt		: ALIAS string {
252 			struct alist *a;
253 
254 			a = xcalloc(1, sizeof(*a));
255 			a->alias = $2;
256 			if (TAILQ_EMPTY(&host->aliases))
257 				TAILQ_INSERT_HEAD(&host->aliases, a, aliases);
258 			else
259 				TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
260 		}
261 		| CERT string		{
262 			only_once(host->cert, "cert");
263 			host->cert = ensure_absolute_path($2);
264 		}
265 		| CGI string		{
266 			only_once(host->cgi, "cgi");
267 			/* drop the starting '/', if any */
268 			if (*$2 == '/')
269 				memmove($2, $2+1, strlen($2));
270 			host->cgi = $2;
271 		}
272 		| ENTRYPOINT string {
273 			only_once(host->entrypoint, "entrypoint");
274 			while (*$2 == '/')
275 				memmove($2, $2+1, strlen($2));
276 			host->entrypoint = $2;
277 		}
278 		| ENV string '=' string {
279 			add_param($2, $4, 1);
280 		}
281 		| KEY string		{
282 			only_once(host->key, "key");
283 			host->key  = ensure_absolute_path($2);
284 		}
285 		| OCSP string		{
286 			only_once(host->ocsp, "ocsp");
287 			host->ocsp = ensure_absolute_path($2);
288 		}
289 		| PARAM string '=' string {
290 			add_param($2, $4, 0);
291 		}
292 		| locopt
293 		;
294 
295 proxy		: PROXY { advance_proxy(); }
296 		  proxy_matches '{' optnl proxy_opts '}' {
297 			if (proxy->host == NULL)
298 				yyerror("invalid proxy block: missing `relay-to' option");
299 
300 			if ((proxy->cert == NULL && proxy->key != NULL) ||
301 			    (proxy->cert != NULL && proxy->key == NULL))
302 				yyerror("invalid proxy block: missing cert or key");
303 		}
304 		;
305 
306 proxy_matches	: /* empty */
307 		| proxy_matches proxy_match
308 		;
309 
310 proxy_match	: PROTO string {
311 			only_once(proxy->match_proto, "proxy proto");
312 			free(proxy->match_proto);
313 			proxy->match_proto = $2;
314 		}
315 		| FOR_HOST string {
316 			only_once(proxy->match_host, "proxy for-host");
317 			free(proxy->match_host);
318 			parsehp($2, &proxy->match_host, &proxy->match_port, "10965");
319 		}
320 		;
321 
322 proxy_opts	: /* empty */
323 		| proxy_opts proxy_opt optnl
324 		;
325 
326 proxy_opt	: CERT string {
327 			only_once(proxy->cert, "proxy cert");
328 			tls_unload_file(proxy->cert, proxy->certlen);
329 			ensure_absolute_path($2);
330 			proxy->cert = tls_load_file($2, &proxy->certlen, NULL);
331 			if (proxy->cert == NULL)
332 				yyerror("can't load cert %s", $2);
333 			free($2);
334 		}
335 		| KEY string {
336 			only_once(proxy->key, "proxy key");
337 			tls_unload_file(proxy->key, proxy->keylen);
338 			ensure_absolute_path($2);
339 			proxy->key = tls_load_file($2, &proxy->keylen, NULL);
340 			if (proxy->key == NULL)
341 				yyerror("can't load key %s", $2);
342 			free($2);
343 		}
344 		| PROTOCOLS string {
345 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
346 				yyerror("invalid protocols string \"%s\"", $2);
347 			free($2);
348 		}
349 		| RELAY_TO string {
350 			only_once(proxy->host, "proxy relay-to");
351 			free(proxy->host);
352 			parsehp($2, &proxy->host, &proxy->port, "1965");
353 		}
354 		| REQUIRE CLIENT CA string {
355 			only_once(proxy->reqca, "require client ca");
356 			ensure_absolute_path($4);
357 			if ((proxy->reqca = load_ca($4)) == NULL)
358 				yyerror("couldn't load ca cert: %s", $4);
359 			free($4);
360 		}
361 		| SNI string {
362 			only_once(proxy->sni, "proxy sni");
363 			free(proxy->sni);
364 			proxy->sni = $2;
365 		}
366 		| USE_TLS bool {
367 			proxy->notls = !$2;
368 		}
369 		| VERIFYNAME bool {
370 			proxy->noverifyname = !$2;
371 		}
372 		;
373 
374 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
375 			/* drop the starting '/' if any */
376 			if (*$3 == '/')
377 				memmove($3, $3+1, strlen($3));
378 			loc->match = $3;
379 		}
380 		| error '}'
381 		;
382 
383 locopts		: /* empty */
384 		| locopts locopt optnl
385 		;
386 
387 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
388 		| BLOCK RETURN NUM string {
389 			only_once(loc->block_fmt, "block");
390 			loc->block_fmt = check_block_fmt($4);
391 			loc->block_code = check_block_code($3);
392 		}
393 		| BLOCK RETURN NUM {
394 			only_once(loc->block_fmt, "block");
395 			loc->block_fmt = xstrdup("temporary failure");
396 			loc->block_code = check_block_code($3);
397 			if ($3 >= 30 && $3 < 40)
398 				yyerror("missing `meta' for block return %d", $3);
399 		}
400 		| BLOCK {
401 			only_once(loc->block_fmt, "block");
402 			loc->block_fmt = xstrdup("temporary failure");
403 			loc->block_code = 40;
404 		}
405 		| DEFAULT TYPE string {
406 			only_once(loc->default_mime, "default type");
407 			loc->default_mime = $3;
408 		}
409 		| FASTCGI fastcgi
410 		| INDEX string {
411 			only_once(loc->index, "index");
412 			loc->index = $2;
413 		}
414 		| LANG string {
415 			only_once(loc->lang, "lang");
416 			loc->lang = $2;
417 		}
418 		| LOG bool	{ loc->disable_log = !$2; }
419 		| REQUIRE CLIENT CA string {
420 			only_once(loc->reqca, "require client ca");
421 			ensure_absolute_path($4);
422 			if ((loc->reqca = load_ca($4)) == NULL)
423 				yyerror("couldn't load ca cert: %s", $4);
424 			free($4);
425 		}
426 		| ROOT string		{
427 			only_once(loc->dir, "root");
428 			loc->dir  = ensure_absolute_path($2);
429 		}
430 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
431 		;
432 
433 fastcgi		: SPAWN string {
434 			only_oncei(loc->fcgi, "fastcgi");
435 			loc->fcgi = fastcgi_conf(NULL, NULL, $2);
436 		}
437 		| string {
438 			only_oncei(loc->fcgi, "fastcgi");
439 			loc->fcgi = fastcgi_conf($1, NULL, NULL);
440 		}
441 		| TCP string PORT NUM {
442 			char *c;
443 			if (asprintf(&c, "%d", $4) == -1)
444 				err(1, "asprintf");
445 			only_oncei(loc->fcgi, "fastcgi");
446 			loc->fcgi = fastcgi_conf($2, c, NULL);
447 		}
448 		| TCP string {
449 			only_oncei(loc->fcgi, "fastcgi");
450 			loc->fcgi = fastcgi_conf($2, xstrdup("9000"), NULL);
451 		}
452 		| TCP string PORT string {
453 			only_oncei(loc->fcgi, "fastcgi");
454 			loc->fcgi = fastcgi_conf($2, $4, NULL);
455 		}
456 		;
457 
458 optnl		: '\n' optnl		/* zero or more newlines */
459 		| ';' optnl		/* semicolons too */
460 		| /*empty*/
461 		;
462 
463 %%
464 
465 static struct keyword {
466 	const char *word;
467 	int token;
468 } keywords[] = {
469 	/* these MUST be sorted */
470 	{"alias", ALIAS},
471 	{"auto", AUTO},
472 	{"block", BLOCK},
473 	{"ca", CA},
474 	{"cert", CERT},
475 	{"cgi", CGI},
476 	{"chroot", CHROOT},
477 	{"client", CLIENT},
478 	{"default", DEFAULT},
479 	{"entrypoint", ENTRYPOINT},
480 	{"env", ENV},
481 	{"fastcgi", FASTCGI},
482 	{"for-host", FOR_HOST},
483 	{"include", INCLUDE},
484 	{"index", INDEX},
485 	{"ipv6", IPV6},
486 	{"key", KEY},
487 	{"lang", LANG},
488 	{"location", LOCATION},
489 	{"log", LOG},
490 	{"map", MAP},
491 	{"mime", MIME},
492 	{"ocsp", OCSP},
493 	{"off", OFF},
494 	{"on", ON},
495 	{"param", PARAM},
496 	{"port", PORT},
497 	{"prefork", PREFORK},
498 	{"proto", PROTO},
499 	{"protocols", PROTOCOLS},
500 	{"proxy", PROXY},
501 	{"relay-to", RELAY_TO},
502 	{"require", REQUIRE},
503 	{"return", RETURN},
504 	{"root", ROOT},
505 	{"server", SERVER},
506 	{"sni", SNI},
507 	{"spawn", SPAWN},
508 	{"strip", STRIP},
509 	{"tcp", TCP},
510 	{"to-ext", TOEXT},
511 	{"type", TYPE},
512 	{"use-tls", USE_TLS},
513 	{"user", USER},
514 	{"verifyname", VERIFYNAME},
515 };
516 
517 void
518 yyerror(const char *msg, ...)
519 {
520 	va_list ap;
521 
522 	file->errors++;
523 
524 	va_start(ap, msg);
525 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
526 	vfprintf(stderr, msg, ap);
527 	fprintf(stderr, "\n");
528 	va_end(ap);
529 }
530 
531 void
532 yywarn(const char *msg, ...)
533 {
534 	va_list ap;
535 
536 	va_start(ap, msg);
537 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
538 	vfprintf(stderr, msg, ap);
539 	fprintf(stderr, "\n");
540 	va_end(ap);
541 }
542 
543 int
544 kw_cmp(const void *k, const void *e)
545 {
546 	return strcmp(k, ((struct keyword *)e)->word);
547 }
548 
549 int
550 lookup(char *s)
551 {
552 	const struct keyword	*p;
553 
554 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
555 	    sizeof(keywords[0]), kw_cmp);
556 
557 	if (p)
558 		return p->token;
559 	else
560 		return STRING;
561 }
562 
563 #define START_EXPAND	1
564 #define DONE_EXPAND	2
565 
566 static int	expanding;
567 
568 int
569 igetc(void)
570 {
571 	int	c;
572 
573 	while (1) {
574 		if (file->ungetpos > 0)
575 			c = file->ungetbuf[--file->ungetpos];
576 		else
577 			c = getc(file->stream);
578 
579 		if (c == START_EXPAND)
580 			expanding = 1;
581 		else if (c == DONE_EXPAND)
582 			expanding = 0;
583 		else
584 			break;
585 	}
586 	return c;
587 }
588 
589 int
590 lgetc(int quotec)
591 {
592 	int		c, next;
593 
594 	if (quotec) {
595 		if ((c = igetc()) == EOF) {
596 			yyerror("reached end of file while parsing "
597 			    "quoted string");
598 			if (file == topfile || popfile() == EOF)
599 				return EOF;
600 			return quotec;
601 		}
602 		return c;
603 	}
604 
605 	while ((c = igetc()) == '\\') {
606 		next = igetc();
607 		if (next != '\n') {
608 			c = next;
609 			break;
610 		}
611 		yylval.lineno = file->lineno;
612 		file->lineno++;
613 	}
614 
615 	if (c == EOF) {
616 		/*
617 		 * Fake EOL when hit EOF for the first time. This gets line
618 		 * count right if last line in included file is syntactically
619 		 * invalid and has no newline.
620 		 */
621 		if (file->eof_reached == 0) {
622 			file->eof_reached = 1;
623 			return '\n';
624 		}
625 		while (c == EOF) {
626 			if (file == topfile || popfile() == EOF)
627 				return EOF;
628 			c = igetc();
629 		}
630 	}
631 	return c;
632 }
633 
634 void
635 lungetc(int c)
636 {
637 	if (c == EOF)
638 		return;
639 
640 	if (file->ungetpos >= file->ungetsize) {
641 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
642 		if (p == NULL)
643 			err(1, "lungetc");
644 		file->ungetbuf = p;
645 		file->ungetsize *= 2;
646 	}
647 	file->ungetbuf[file->ungetpos++] = c;
648 }
649 
650 int
651 findeol(void)
652 {
653 	int	c;
654 
655 	/* Skip to either EOF or the first real EOL. */
656 	while (1) {
657 		c = lgetc(0);
658 		if (c == '\n') {
659 			file->lineno++;
660 			break;
661 		}
662 		if (c == EOF)
663 			break;
664 	}
665 	return ERROR;
666 }
667 
668 int
669 yylex(void)
670 {
671 	char	 buf[8096];
672 	char	*p, *val;
673 	int	 quotec, next, c;
674 	int	 token;
675 
676 top:
677 	p = buf;
678 	while ((c = lgetc(0)) == ' ' || c == '\t')
679 		; /* nothing */
680 
681 	yylval.lineno = file->lineno;
682 	if (c == '#')
683 		while ((c = lgetc(0)) != '\n' && c != EOF)
684 			; /* nothing */
685 	if (c == '$' && !expanding) {
686 		while (1) {
687 			if ((c = lgetc(0)) == EOF)
688 				return 0;
689 			if (p + 1 >= buf + sizeof(buf) -1) {
690 				yyerror("string too long");
691 				return findeol();
692 			}
693 			if (isalnum(c) || c == '_') {
694 				*p++ = c;
695 				continue;
696 			}
697 			*p = '\0';
698 			lungetc(c);
699 			break;
700 		}
701 		val = symget(buf);
702 		if (val == NULL) {
703 			yyerror("macro `%s' not defined", buf);
704 			return findeol();
705 		}
706 		yylval.v.string = xstrdup(val);
707 		return STRING;
708 	}
709 	if (c == '@' && !expanding) {
710 		while (1) {
711 			if ((c = lgetc(0)) == EOF)
712 				return 0;
713 
714 			if (p + 1 >= buf + sizeof(buf) - 1) {
715 				yyerror("string too long");
716 				return findeol();
717 			}
718 			if (isalnum(c) || c == '_') {
719 				*p++ = c;
720 				continue;
721 			}
722 			*p = '\0';
723 			lungetc(c);
724 			break;
725 		}
726 		val = symget(buf);
727 		if (val == NULL) {
728 			yyerror("macro '%s' not defined", buf);
729 			return findeol();
730 		}
731 		p = val + strlen(val) - 1;
732 		lungetc(DONE_EXPAND);
733 		while (p >= val) {
734 			lungetc(*p);
735 			p--;
736 		}
737 		lungetc(START_EXPAND);
738 		goto top;
739 	}
740 
741 	switch (c) {
742 	case '\'':
743 	case '"':
744 		quotec = c;
745 		while (1) {
746 			if ((c = lgetc(quotec)) == EOF)
747 				return 0;
748 			if (c == '\n') {
749 				file->lineno++;
750 				continue;
751 			} else if (c == '\\') {
752 				if ((next = lgetc(quotec)) == EOF)
753 					return (0);
754 				if (next == quotec || next == ' ' ||
755 				    next == '\t')
756 					c = next;
757 				else if (next == '\n') {
758 					file->lineno++;
759 					continue;
760 				} else
761 					lungetc(next);
762 			} else if (c == quotec) {
763 				*p = '\0';
764 				break;
765 			} else if (c == '\0') {
766 				yyerror("invalid syntax");
767 				return findeol();
768 			}
769 			if (p + 1 >= buf + sizeof(buf) - 1) {
770 				yyerror("string too long");
771 				return findeol();
772 			}
773 			*p++ = c;
774 		}
775 		yylval.v.string = strdup(buf);
776 		if (yylval.v.string == NULL)
777 			err(1, "yylex: strdup");
778 		return STRING;
779 	}
780 
781 #define allowed_to_end_number(x) \
782 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
783 
784 	if (c == '-' || isdigit(c)) {
785 		do {
786 			*p++ = c;
787 			if ((size_t)(p-buf) >= sizeof(buf)) {
788 				yyerror("string too long");
789 				return findeol();
790 			}
791 		} while ((c = lgetc(0)) != EOF && isdigit(c));
792 		lungetc(c);
793 		if (p == buf + 1 && buf[0] == '-')
794 			goto nodigits;
795 		if (c == EOF || allowed_to_end_number(c)) {
796 			const char *errstr = NULL;
797 
798 			*p = '\0';
799 			yylval.v.number = strtonum(buf, LLONG_MIN,
800 			    LLONG_MAX, &errstr);
801 			if (errstr) {
802 				yyerror("\"%s\" invalid number: %s",
803 				    buf, errstr);
804 				return findeol();
805 			}
806 			return NUM;
807 		} else {
808 nodigits:
809 			while (p > buf + 1)
810 				lungetc(*--p);
811 			c = *--p;
812 			if (c == '-')
813 				return c;
814 		}
815 	}
816 
817 #define allowed_in_string(x) \
818 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
819 	x != '{' && x != '}' && \
820 	x != '!' && x != '=' && x != '#' && \
821 	x != ',' && x != ';'))
822 
823 	if (isalnum(c) || c == ':' || c == '_') {
824 		do {
825 			*p++ = c;
826 			if ((size_t)(p-buf) >= sizeof(buf)) {
827 				yyerror("string too long");
828 				return findeol();
829 			}
830 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
831 		lungetc(c);
832 		*p = '\0';
833 		if ((token = lookup(buf)) == STRING)
834 			yylval.v.string = xstrdup(buf);
835 		return token;
836 	}
837 	if (c == '\n') {
838 		yylval.lineno = file->lineno;
839 		file->lineno++;
840 	}
841 	if (c == EOF)
842 		return 0;
843 	return c;
844 }
845 
846 struct file *
847 pushfile(const char *name, int secret)
848 {
849 	struct file	*nfile;
850 
851 	nfile = xcalloc(1, sizeof(*nfile));
852 	nfile->name = xstrdup(name);
853 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
854 		log_warn(NULL, "can't open %s: %s", nfile->name,
855 		    strerror(errno));
856 		free(nfile->name);
857 		free(nfile);
858 		return NULL;
859 	}
860 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
861 	nfile->ungetsize = 16;
862 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
863 	TAILQ_INSERT_TAIL(&files, nfile, entry);
864 	return nfile;
865 }
866 
867 int
868 popfile(void)
869 {
870 	struct file	*prev;
871 
872 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
873 		prev->errors += file->errors;
874 
875 	TAILQ_REMOVE(&files, file, entry);
876 	fclose(file->stream);
877 	free(file->name);
878 	free(file->ungetbuf);
879 	free(file);
880 	file = prev;
881 	return file ? 0 : EOF;
882 }
883 
884 void
885 parse_conf(const char *filename)
886 {
887 	struct sym		*sym, *next;
888 
889 	file = pushfile(filename, 0);
890 	if (file == NULL)
891 		exit(1);
892 	topfile = file;
893 
894 	yyparse();
895 	errors = file->errors;
896 	popfile();
897 
898 	/* Free macros and check which have not been used. */
899 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
900 		/* TODO: warn if !sym->used */
901 		if (!sym->persist) {
902 			free(sym->name);
903 			free(sym->val);
904 			TAILQ_REMOVE(&symhead, sym, entry);
905 			free(sym);
906 		}
907 	}
908 
909 	if (errors)
910 		exit(1);
911 }
912 
913 void
914 print_conf(void)
915 {
916 	struct vhost	*h;
917 	/* struct location	*l; */
918 	/* struct envlist	*e; */
919 	/* struct alist	*a; */
920 
921 	if (conf.chroot != NULL)
922 		printf("chroot \"%s\"\n", conf.chroot);
923 	printf("ipv6 %s\n", conf.ipv6 ? "on" : "off");
924 	/* XXX: defined mimes? */
925 	printf("port %d\n", conf.port);
926 	printf("prefork %d\n", conf.prefork);
927 	/* XXX: protocols? */
928 	if (conf.user != NULL)
929 		printf("user \"%s\"\n", conf.user);
930 
931 	TAILQ_FOREACH(h, &hosts, vhosts) {
932 		printf("\nserver \"%s\" {\n", h->domain);
933 		printf("	cert \"%s\"\n", h->cert);
934 		printf("	key \"%s\"\n", h->key);
935 		/* TODO: print locations... */
936 		printf("}\n");
937 	}
938 }
939 
940 int
941 symset(const char *name, const char *val, int persist)
942 {
943 	struct sym *sym;
944 
945 	TAILQ_FOREACH(sym, &symhead, entry) {
946 		if (!strcmp(name, sym->name))
947 			break;
948 	}
949 
950 	if (sym != NULL) {
951 		if (sym->persist)
952 			return 0;
953 		else {
954 			free(sym->name);
955 			free(sym->val);
956 			TAILQ_REMOVE(&symhead, sym, entry);
957 			free(sym);
958 		}
959 	}
960 
961 	sym = xcalloc(1, sizeof(*sym));
962 	sym->name = xstrdup(name);
963 	sym->val = xstrdup(val);
964 	sym->used = 0;
965 	sym->persist = persist;
966 
967 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
968 	return 0;
969 }
970 
971 int
972 cmdline_symset(char *s)
973 {
974 	char	*sym, *val;
975 	int	 ret;
976 
977 	if ((val = strrchr(s, '=')) == NULL)
978 		return -1;
979 	sym = xcalloc(1, val - s + 1);
980 	memcpy(sym, s, val - s);
981 	ret = symset(sym, val + 1, 1);
982 	free(sym);
983 	return ret;
984 }
985 
986 char *
987 symget(const char *nam)
988 {
989 	struct sym	*sym;
990 
991 	TAILQ_FOREACH(sym, &symhead, entry) {
992 		if (strcmp(nam, sym->name) == 0) {
993 			sym->used = 1;
994 			return sym->val;
995 		}
996 	}
997 	return NULL;
998 }
999 
1000 struct vhost *
1001 new_vhost(void)
1002 {
1003 	return xcalloc(1, sizeof(struct vhost));
1004 }
1005 
1006 struct location *
1007 new_location(void)
1008 {
1009 	struct location *l;
1010 
1011 	l = xcalloc(1, sizeof(*l));
1012 	l->dirfd = -1;
1013 	l->fcgi = -1;
1014 	return l;
1015 }
1016 
1017 struct proxy *
1018 new_proxy(void)
1019 {
1020 	struct proxy *p;
1021 
1022 	p = xcalloc(1, sizeof(*p));
1023 	p->protocols = TLS_PROTOCOLS_DEFAULT;
1024 	return p;
1025 }
1026 
1027 char *
1028 ensure_absolute_path(char *path)
1029 {
1030 	if (path == NULL || *path != '/')
1031 		yyerror("not an absolute path: %s", path);
1032 	return path;
1033 }
1034 
1035 int
1036 check_block_code(int n)
1037 {
1038 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1039 		yyerror("invalid block code %d", n);
1040 	return n;
1041 }
1042 
1043 char *
1044 check_block_fmt(char *fmt)
1045 {
1046 	char *s;
1047 
1048 	for (s = fmt; *s; ++s) {
1049 		if (*s != '%')
1050 			continue;
1051 		switch (*++s) {
1052 		case '%':
1053 		case 'p':
1054 		case 'q':
1055 		case 'P':
1056 		case 'N':
1057 			break;
1058 		default:
1059 			yyerror("invalid format specifier %%%c", *s);
1060 		}
1061 	}
1062 
1063 	return fmt;
1064 }
1065 
1066 int
1067 check_strip_no(int n)
1068 {
1069 	if (n <= 0)
1070 		yyerror("invalid strip number %d", n);
1071 	return n;
1072 }
1073 
1074 int
1075 check_port_num(int n)
1076 {
1077 	if (n <= 0 || n >= UINT16_MAX)
1078 		yyerror("port number is %s: %d",
1079 		    n <= 0 ? "too small" : "too large",
1080 		    n);
1081 	return n;
1082 }
1083 
1084 int
1085 check_prefork_num(int n)
1086 {
1087 	if (n <= 0 || n >= PROC_MAX)
1088 		yyerror("invalid prefork number %d", n);
1089 	return n;
1090 }
1091 
1092 void
1093 advance_loc(void)
1094 {
1095 	loc = new_location();
1096 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1097 }
1098 
1099 void
1100 advance_proxy(void)
1101 {
1102 	proxy = new_proxy();
1103 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1104 }
1105 
1106 void
1107 parsehp(char *str, char **host, const char **port, const char *def)
1108 {
1109 	char		*at;
1110 	const char	*errstr;
1111 
1112 	*host = str;
1113 
1114 	if ((at = strchr(str, ':')) != NULL) {
1115 		*at++ = '\0';
1116 		*port = at;
1117 	} else
1118 		*port = def;
1119 
1120 	strtonum(*port, 1, UINT16_MAX, &errstr);
1121 	if (errstr != NULL)
1122 		yyerror("port is %s: %s", errstr, *port);
1123 }
1124 
1125 void
1126 only_once(const void *ptr, const char *name)
1127 {
1128 	if (ptr != NULL)
1129 		yyerror("`%s' specified more than once", name);
1130 }
1131 
1132 void
1133 only_oncei(int i, const char *name)
1134 {
1135 	if (i != -1)
1136 		yyerror("`%s' specified more than once", name);
1137 }
1138 
1139 int
1140 fastcgi_conf(char *path, char *port, char *prog)
1141 {
1142 	struct fcgi	*f;
1143 	int		i;
1144 
1145 	for (i = 0; i < FCGI_MAX; ++i) {
1146 		f = &fcgi[i];
1147 
1148 		if (f->path == NULL) {
1149 			f->id = i;
1150 			f->path = path;
1151 			f->port = port;
1152 			f->prog = prog;
1153 			return i;
1154 		}
1155 
1156 		/* XXX: what to do with prog? */
1157 		if (!strcmp(f->path, path) &&
1158 		    ((port == NULL && f->port == NULL) ||
1159 		     !strcmp(f->port, port))) {
1160 			free(path);
1161 			free(port);
1162 			return i;
1163 		}
1164 	}
1165 
1166 	yyerror("too much `fastcgi' rules defined.");
1167 	return -1;
1168 }
1169 
1170 void
1171 add_param(char *name, char *val, int env)
1172 {
1173 	struct envlist *e;
1174 	struct envhead *h;
1175 
1176 	if (env)
1177 		h = &host->env;
1178 	else
1179 		h = &host->params;
1180 
1181 	e = xcalloc(1, sizeof(*e));
1182 	e->name = name;
1183 	e->value = val;
1184 	if (TAILQ_EMPTY(h))
1185 		TAILQ_INSERT_HEAD(h, e, envs);
1186 	else
1187 		TAILQ_INSERT_TAIL(h, e, envs);
1188 }