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 <ctype.h>
27 #include <errno.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 
33 #include "gmid.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 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 		| USE_TLS bool {
355 			proxy->notls = !$2;
356 		}
357 		| VERIFYNAME bool {
358 			proxy->noverifyname = !$2;
359 		}
360 		;
361 
362 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
363 			/* drop the starting '/' if any */
364 			if (*$3 == '/')
365 				memmove($3, $3+1, strlen($3));
366 			loc->match = $3;
367 		}
368 		| error '}'
369 		;
370 
371 locopts		: /* empty */
372 		| locopts locopt optnl
373 		;
374 
375 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
376 		| BLOCK RETURN NUM string {
377 			only_once(loc->block_fmt, "block");
378 			loc->block_fmt = check_block_fmt($4);
379 			loc->block_code = check_block_code($3);
380 		}
381 		| BLOCK RETURN NUM {
382 			only_once(loc->block_fmt, "block");
383 			loc->block_fmt = xstrdup("temporary failure");
384 			loc->block_code = check_block_code($3);
385 			if ($3 >= 30 && $3 < 40)
386 				yyerror("missing `meta' for block return %d", $3);
387 		}
388 		| BLOCK {
389 			only_once(loc->block_fmt, "block");
390 			loc->block_fmt = xstrdup("temporary failure");
391 			loc->block_code = 40;
392 		}
393 		| DEFAULT TYPE string {
394 			only_once(loc->default_mime, "default type");
395 			loc->default_mime = $3;
396 		}
397 		| FASTCGI fastcgi
398 		| INDEX string {
399 			only_once(loc->index, "index");
400 			loc->index = $2;
401 		}
402 		| LANG string {
403 			only_once(loc->lang, "lang");
404 			loc->lang = $2;
405 		}
406 		| LOG bool	{ loc->disable_log = !$2; }
407 		| REQUIRE CLIENT CA string {
408 			only_once(loc->reqca, "require client ca");
409 			ensure_absolute_path($4);
410 			if ((loc->reqca = load_ca($4)) == NULL)
411 				yyerror("couldn't load ca cert: %s", $4);
412 			free($4);
413 		}
414 		| ROOT string		{
415 			only_once(loc->dir, "root");
416 			loc->dir  = ensure_absolute_path($2);
417 		}
418 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
419 		;
420 
421 fastcgi		: SPAWN string {
422 			only_oncei(loc->fcgi, "fastcgi");
423 			loc->fcgi = fastcgi_conf(NULL, NULL, $2);
424 		}
425 		| string {
426 			only_oncei(loc->fcgi, "fastcgi");
427 			loc->fcgi = fastcgi_conf($1, NULL, NULL);
428 		}
429 		| TCP string PORT NUM {
430 			char *c;
431 			if (asprintf(&c, "%d", $4) == -1)
432 				err(1, "asprintf");
433 			only_oncei(loc->fcgi, "fastcgi");
434 			loc->fcgi = fastcgi_conf($2, c, NULL);
435 		}
436 		| TCP string {
437 			only_oncei(loc->fcgi, "fastcgi");
438 			loc->fcgi = fastcgi_conf($2, xstrdup("9000"), NULL);
439 		}
440 		| TCP string PORT string {
441 			only_oncei(loc->fcgi, "fastcgi");
442 			loc->fcgi = fastcgi_conf($2, $4, NULL);
443 		}
444 		;
445 
446 optnl		: '\n' optnl		/* zero or more newlines */
447 		| ';' optnl		/* semicolons too */
448 		| /*empty*/
449 		;
450 
451 %%
452 
453 static struct keyword {
454 	const char *word;
455 	int token;
456 } keywords[] = {
457 	/* these MUST be sorted */
458 	{"alias", ALIAS},
459 	{"auto", AUTO},
460 	{"block", BLOCK},
461 	{"ca", CA},
462 	{"cert", CERT},
463 	{"cgi", CGI},
464 	{"chroot", CHROOT},
465 	{"client", CLIENT},
466 	{"default", DEFAULT},
467 	{"entrypoint", ENTRYPOINT},
468 	{"env", ENV},
469 	{"fastcgi", FASTCGI},
470 	{"for-host", FOR_HOST},
471 	{"index", INDEX},
472 	{"ipv6", IPV6},
473 	{"key", KEY},
474 	{"lang", LANG},
475 	{"location", LOCATION},
476 	{"log", LOG},
477 	{"map", MAP},
478 	{"mime", MIME},
479 	{"ocsp", OCSP},
480 	{"off", OFF},
481 	{"on", ON},
482 	{"param", PARAM},
483 	{"port", PORT},
484 	{"prefork", PREFORK},
485 	{"proto", PROTO},
486 	{"protocols", PROTOCOLS},
487 	{"proxy", PROXY},
488 	{"relay-to", RELAY_TO},
489 	{"require", REQUIRE},
490 	{"return", RETURN},
491 	{"root", ROOT},
492 	{"server", SERVER},
493 	{"spawn", SPAWN},
494 	{"strip", STRIP},
495 	{"tcp", TCP},
496 	{"to-ext", TOEXT},
497 	{"type", TYPE},
498 	{"use-tls", USE_TLS},
499 	{"user", USER},
500 	{"verifyname", VERIFYNAME},
501 };
502 
503 void
504 yyerror(const char *msg, ...)
505 {
506 	va_list ap;
507 
508 	file->errors++;
509 
510 	va_start(ap, msg);
511 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
512 	vfprintf(stderr, msg, ap);
513 	fprintf(stderr, "\n");
514 	va_end(ap);
515 }
516 
517 void
518 yywarn(const char *msg, ...)
519 {
520 	va_list ap;
521 
522 	va_start(ap, msg);
523 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
524 	vfprintf(stderr, msg, ap);
525 	fprintf(stderr, "\n");
526 	va_end(ap);
527 }
528 
529 int
530 kw_cmp(const void *k, const void *e)
531 {
532 	return strcmp(k, ((struct keyword *)e)->word);
533 }
534 
535 int
536 lookup(char *s)
537 {
538 	const struct keyword	*p;
539 
540 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
541 	    sizeof(keywords[0]), kw_cmp);
542 
543 	if (p)
544 		return p->token;
545 	else
546 		return STRING;
547 }
548 
549 #define START_EXPAND	1
550 #define DONE_EXPAND	2
551 
552 static int	expanding;
553 
554 int
555 igetc(void)
556 {
557 	int	c;
558 
559 	while (1) {
560 		if (file->ungetpos > 0)
561 			c = file->ungetbuf[--file->ungetpos];
562 		else
563 			c = getc(file->stream);
564 
565 		if (c == START_EXPAND)
566 			expanding = 1;
567 		else if (c == DONE_EXPAND)
568 			expanding = 0;
569 		else
570 			break;
571 	}
572 	return c;
573 }
574 
575 int
576 lgetc(int quotec)
577 {
578 	int		c, next;
579 
580 	if (quotec) {
581 		if ((c = igetc()) == EOF) {
582 			yyerror("reached end of file while parsing "
583 			    "quoted string");
584 			if (file == topfile || popfile() == EOF)
585 				return EOF;
586 			return quotec;
587 		}
588 		return c;
589 	}
590 
591 	while ((c = igetc()) == '\\') {
592 		next = igetc();
593 		if (next != '\n') {
594 			c = next;
595 			break;
596 		}
597 		yylval.lineno = file->lineno;
598 		file->lineno++;
599 	}
600 
601 	if (c == EOF) {
602 		/*
603 		 * Fake EOL when hit EOF for the first time. This gets line
604 		 * count right if last line in included file is syntactically
605 		 * invalid and has no newline.
606 		 */
607 		if (file->eof_reached == 0) {
608 			file->eof_reached = 1;
609 			return '\n';
610 		}
611 		while (c == EOF) {
612 			if (file == topfile || popfile() == EOF)
613 				return EOF;
614 			c = igetc();
615 		}
616 	}
617 	return c;
618 }
619 
620 void
621 lungetc(int c)
622 {
623 	if (c == EOF)
624 		return;
625 
626 	if (file->ungetpos >= file->ungetsize) {
627 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
628 		if (p == NULL)
629 			err(1, "lungetc");
630 		file->ungetbuf = p;
631 		file->ungetsize *= 2;
632 	}
633 	file->ungetbuf[file->ungetpos++] = c;
634 }
635 
636 int
637 findeol(void)
638 {
639 	int	c;
640 
641 	/* Skip to either EOF or the first real EOL. */
642 	while (1) {
643 		c = lgetc(0);
644 		if (c == '\n') {
645 			file->lineno++;
646 			break;
647 		}
648 		if (c == EOF)
649 			break;
650 	}
651 	return ERROR;
652 }
653 
654 int
655 yylex(void)
656 {
657 	char	 buf[8096];
658 	char	*p, *val;
659 	int	 quotec, next, c;
660 	int	 token;
661 
662 top:
663 	p = buf;
664 	while ((c = lgetc(0)) == ' ' || c == '\t')
665 		; /* nothing */
666 
667 	yylval.lineno = file->lineno;
668 	if (c == '#')
669 		while ((c = lgetc(0)) != '\n' && c != EOF)
670 			; /* nothing */
671 	if (c == '$' && !expanding) {
672 		while (1) {
673 			if ((c = lgetc(0)) == EOF)
674 				return 0;
675 			if (p + 1 >= buf + sizeof(buf) -1) {
676 				yyerror("string too long");
677 				return findeol();
678 			}
679 			if (isalnum(c) || c == '_') {
680 				*p++ = c;
681 				continue;
682 			}
683 			*p = '\0';
684 			lungetc(c);
685 			break;
686 		}
687 		val = symget(buf);
688 		if (val == NULL) {
689 			yyerror("macro `%s' not defined", buf);
690 			return findeol();
691 		}
692 		yylval.v.string = xstrdup(val);
693 		return STRING;
694 	}
695 	if (c == '@' && !expanding) {
696 		while (1) {
697 			if ((c = lgetc(0)) == EOF)
698 				return 0;
699 
700 			if (p + 1 >= buf + sizeof(buf) - 1) {
701 				yyerror("string too long");
702 				return findeol();
703 			}
704 			if (isalnum(c) || c == '_') {
705 				*p++ = c;
706 				continue;
707 			}
708 			*p = '\0';
709 			lungetc(c);
710 			break;
711 		}
712 		val = symget(buf);
713 		if (val == NULL) {
714 			yyerror("macro '%s' not defined", buf);
715 			return findeol();
716 		}
717 		p = val + strlen(val) - 1;
718 		lungetc(DONE_EXPAND);
719 		while (p >= val) {
720 			lungetc(*p);
721 			p--;
722 		}
723 		lungetc(START_EXPAND);
724 		goto top;
725 	}
726 
727 	switch (c) {
728 	case '\'':
729 	case '"':
730 		quotec = c;
731 		while (1) {
732 			if ((c = lgetc(quotec)) == EOF)
733 				return 0;
734 			if (c == '\n') {
735 				file->lineno++;
736 				continue;
737 			} else if (c == '\\') {
738 				if ((next = lgetc(quotec)) == EOF)
739 					return (0);
740 				if (next == quotec || next == ' ' ||
741 				    next == '\t')
742 					c = next;
743 				else if (next == '\n') {
744 					file->lineno++;
745 					continue;
746 				} else
747 					lungetc(next);
748 			} else if (c == quotec) {
749 				*p = '\0';
750 				break;
751 			} else if (c == '\0') {
752 				yyerror("invalid syntax");
753 				return findeol();
754 			}
755 			if (p + 1 >= buf + sizeof(buf) - 1) {
756 				yyerror("string too long");
757 				return findeol();
758 			}
759 			*p++ = c;
760 		}
761 		yylval.v.string = strdup(buf);
762 		if (yylval.v.string == NULL)
763 			err(1, "yylex: strdup");
764 		return STRING;
765 	}
766 
767 #define allowed_to_end_number(x) \
768 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
769 
770 	if (c == '-' || isdigit(c)) {
771 		do {
772 			*p++ = c;
773 			if ((size_t)(p-buf) >= sizeof(buf)) {
774 				yyerror("string too long");
775 				return findeol();
776 			}
777 		} while ((c = lgetc(0)) != EOF && isdigit(c));
778 		lungetc(c);
779 		if (p == buf + 1 && buf[0] == '-')
780 			goto nodigits;
781 		if (c == EOF || allowed_to_end_number(c)) {
782 			const char *errstr = NULL;
783 
784 			*p = '\0';
785 			yylval.v.number = strtonum(buf, LLONG_MIN,
786 			    LLONG_MAX, &errstr);
787 			if (errstr) {
788 				yyerror("\"%s\" invalid number: %s",
789 				    buf, errstr);
790 				return findeol();
791 			}
792 			return NUM;
793 		} else {
794 nodigits:
795 			while (p > buf + 1)
796 				lungetc(*--p);
797 			c = *--p;
798 			if (c == '-')
799 				return c;
800 		}
801 	}
802 
803 #define allowed_in_string(x) \
804 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
805 	x != '{' && x != '}' && \
806 	x != '!' && x != '=' && x != '#' && \
807 	x != ',' && x != ';'))
808 
809 	if (isalnum(c) || c == ':' || c == '_') {
810 		do {
811 			*p++ = c;
812 			if ((size_t)(p-buf) >= sizeof(buf)) {
813 				yyerror("string too long");
814 				return findeol();
815 			}
816 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
817 		lungetc(c);
818 		*p = '\0';
819 		if ((token = lookup(buf)) == STRING)
820 			yylval.v.string = xstrdup(buf);
821 		return token;
822 	}
823 	if (c == '\n') {
824 		yylval.lineno = file->lineno;
825 		file->lineno++;
826 	}
827 	if (c == EOF)
828 		return 0;
829 	return c;
830 }
831 
832 struct file *
833 pushfile(const char *name, int secret)
834 {
835 	struct file	*nfile;
836 
837 	nfile = xcalloc(1, sizeof(*nfile));
838 	nfile->name = xstrdup(name);
839 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
840 		log_warn(NULL, "can't open %s: %s", nfile->name,
841 		    strerror(errno));
842 		free(nfile->name);
843 		free(nfile);
844 		return NULL;
845 	}
846 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
847 	nfile->ungetsize = 16;
848 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
849 	TAILQ_INSERT_TAIL(&files, nfile, entry);
850 	return nfile;
851 }
852 
853 int
854 popfile(void)
855 {
856 	struct file	*prev;
857 
858 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
859 		prev->errors += file->errors;
860 
861 	TAILQ_REMOVE(&files, file, entry);
862 	fclose(file->stream);
863 	free(file->name);
864 	free(file->ungetbuf);
865 	free(file);
866 	file = prev;
867 	return file ? 0 : EOF;
868 }
869 
870 void
871 parse_conf(const char *filename)
872 {
873 	struct sym		*sym, *next;
874 
875 	file = pushfile(filename, 0);
876 	if (file == NULL)
877 		exit(1);
878 	topfile = file;
879 
880 	yyparse();
881 	errors = file->errors;
882 	popfile();
883 
884 	/* Free macros and check which have not been used. */
885 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
886 		/* TODO: warn if !sym->used */
887 		if (!sym->persist) {
888 			free(sym->name);
889 			free(sym->val);
890 			TAILQ_REMOVE(&symhead, sym, entry);
891 			free(sym);
892 		}
893 	}
894 
895 	if (errors)
896 		exit(1);
897 }
898 
899 void
900 print_conf(void)
901 {
902 	struct vhost	*h;
903 	/* struct location	*l; */
904 	/* struct envlist	*e; */
905 	/* struct alist	*a; */
906 
907 	if (conf.chroot != NULL)
908 		printf("chroot \"%s\"\n", conf.chroot);
909 	printf("ipv6 %s\n", conf.ipv6 ? "on" : "off");
910 	/* XXX: defined mimes? */
911 	printf("port %d\n", conf.port);
912 	printf("prefork %d\n", conf.prefork);
913 	/* XXX: protocols? */
914 	if (conf.user != NULL)
915 		printf("user \"%s\"\n", conf.user);
916 
917 	TAILQ_FOREACH(h, &hosts, vhosts) {
918 		printf("\nserver \"%s\" {\n", h->domain);
919 		printf("	cert \"%s\"\n", h->cert);
920 		printf("	key \"%s\"\n", h->key);
921 		/* TODO: print locations... */
922 		printf("}\n");
923 	}
924 }
925 
926 int
927 symset(const char *name, const char *val, int persist)
928 {
929 	struct sym *sym;
930 
931 	TAILQ_FOREACH(sym, &symhead, entry) {
932 		if (!strcmp(name, sym->name))
933 			break;
934 	}
935 
936 	if (sym != NULL) {
937 		if (sym->persist)
938 			return 0;
939 		else {
940 			free(sym->name);
941 			free(sym->val);
942 			TAILQ_REMOVE(&symhead, sym, entry);
943 			free(sym);
944 		}
945 	}
946 
947 	sym = xcalloc(1, sizeof(*sym));
948 	sym->name = xstrdup(name);
949 	sym->val = xstrdup(val);
950 	sym->used = 0;
951 	sym->persist = persist;
952 
953 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
954 	return 0;
955 }
956 
957 int
958 cmdline_symset(char *s)
959 {
960 	char	*sym, *val;
961 	int	 ret;
962 
963 	if ((val = strrchr(s, '=')) == NULL)
964 		return -1;
965 	sym = xcalloc(1, val - s + 1);
966 	memcpy(sym, s, val - s);
967 	ret = symset(sym, val + 1, 1);
968 	free(sym);
969 	return ret;
970 }
971 
972 char *
973 symget(const char *nam)
974 {
975 	struct sym	*sym;
976 
977 	TAILQ_FOREACH(sym, &symhead, entry) {
978 		if (strcmp(nam, sym->name) == 0) {
979 			sym->used = 1;
980 			return sym->val;
981 		}
982 	}
983 	return NULL;
984 }
985 
986 struct vhost *
987 new_vhost(void)
988 {
989 	return xcalloc(1, sizeof(struct vhost));
990 }
991 
992 struct location *
993 new_location(void)
994 {
995 	struct location *l;
996 
997 	l = xcalloc(1, sizeof(*l));
998 	l->dirfd = -1;
999 	l->fcgi = -1;
1000 	return l;
1001 }
1002 
1003 struct proxy *
1004 new_proxy(void)
1005 {
1006 	struct proxy *p;
1007 
1008 	p = xcalloc(1, sizeof(*p));
1009 	p->protocols = TLS_PROTOCOLS_DEFAULT;
1010 	return p;
1011 }
1012 
1013 char *
1014 ensure_absolute_path(char *path)
1015 {
1016 	if (path == NULL || *path != '/')
1017 		yyerror("not an absolute path: %s", path);
1018 	return path;
1019 }
1020 
1021 int
1022 check_block_code(int n)
1023 {
1024 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1025 		yyerror("invalid block code %d", n);
1026 	return n;
1027 }
1028 
1029 char *
1030 check_block_fmt(char *fmt)
1031 {
1032 	char *s;
1033 
1034 	for (s = fmt; *s; ++s) {
1035 		if (*s != '%')
1036 			continue;
1037 		switch (*++s) {
1038 		case '%':
1039 		case 'p':
1040 		case 'q':
1041 		case 'P':
1042 		case 'N':
1043 			break;
1044 		default:
1045 			yyerror("invalid format specifier %%%c", *s);
1046 		}
1047 	}
1048 
1049 	return fmt;
1050 }
1051 
1052 int
1053 check_strip_no(int n)
1054 {
1055 	if (n <= 0)
1056 		yyerror("invalid strip number %d", n);
1057 	return n;
1058 }
1059 
1060 int
1061 check_port_num(int n)
1062 {
1063 	if (n <= 0 || n >= UINT16_MAX)
1064 		yyerror("port number is %s: %d",
1065 		    n <= 0 ? "too small" : "too large",
1066 		    n);
1067 	return n;
1068 }
1069 
1070 int
1071 check_prefork_num(int n)
1072 {
1073 	if (n <= 0 || n >= PROC_MAX)
1074 		yyerror("invalid prefork number %d", n);
1075 	return n;
1076 }
1077 
1078 void
1079 advance_loc(void)
1080 {
1081 	loc = new_location();
1082 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1083 }
1084 
1085 void
1086 advance_proxy(void)
1087 {
1088 	proxy = new_proxy();
1089 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1090 }
1091 
1092 void
1093 parsehp(char *str, char **host, const char **port, const char *def)
1094 {
1095 	char		*at;
1096 	const char	*errstr;
1097 
1098 	*host = str;
1099 
1100 	if ((at = strchr(str, ':')) != NULL) {
1101 		*at++ = '\0';
1102 		*port = at;
1103 	} else
1104 		*port = def;
1105 
1106 	strtonum(*port, 1, UINT16_MAX, &errstr);
1107 	if (errstr != NULL)
1108 		yyerror("port is %s: %s", errstr, *port);
1109 }
1110 
1111 void
1112 only_once(const void *ptr, const char *name)
1113 {
1114 	if (ptr != NULL)
1115 		yyerror("`%s' specified more than once", name);
1116 }
1117 
1118 void
1119 only_oncei(int i, const char *name)
1120 {
1121 	if (i != -1)
1122 		yyerror("`%s' specified more than once", name);
1123 }
1124 
1125 int
1126 fastcgi_conf(char *path, char *port, char *prog)
1127 {
1128 	struct fcgi	*f;
1129 	int		i;
1130 
1131 	for (i = 0; i < FCGI_MAX; ++i) {
1132 		f = &fcgi[i];
1133 
1134 		if (f->path == NULL) {
1135 			f->id = i;
1136 			f->path = path;
1137 			f->port = port;
1138 			f->prog = prog;
1139 			return i;
1140 		}
1141 
1142 		/* XXX: what to do with prog? */
1143 		if (!strcmp(f->path, path) &&
1144 		    ((port == NULL && f->port == NULL) ||
1145 		     !strcmp(f->port, port))) {
1146 			free(path);
1147 			free(port);
1148 			return i;
1149 		}
1150 	}
1151 
1152 	yyerror("too much `fastcgi' rules defined.");
1153 	return -1;
1154 }
1155 
1156 void
1157 add_param(char *name, char *val, int env)
1158 {
1159 	struct envlist *e;
1160 	struct envhead *h;
1161 
1162 	if (env)
1163 		h = &host->env;
1164 	else
1165 		h = &host->params;
1166 
1167 	e = xcalloc(1, sizeof(*e));
1168 	e->name = name;
1169 	e->value = val;
1170 	if (TAILQ_EMPTY(h))
1171 		TAILQ_INSERT_HEAD(h, e, envs);
1172 	else
1173 		TAILQ_INSERT_TAIL(h, e, envs);
1174 }