1 /*
2  * Copyright (c) 2016-2019, 2020-2021 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
4  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
5  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
6  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
7  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
8  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
9  *
10  * Permission to use, copy, modify, and distribute this software for any
11  * purpose with or without fee is hereby granted, provided that the above
12  * copyright notice and this permission notice appear in all copies.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
16  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21  */
22 
23 %{
24 #include <sys/ioctl.h>
25 #include <sys/types.h>
26 #include <sys/queue.h>
27 #include <sys/socket.h>
28 #include <sys/stat.h>
29 
30 #include <net/if.h>
31 #include <netinet/in.h>
32 
33 #include <arpa/inet.h>
34 
35 #include <ctype.h>
36 #include <err.h>
37 #include <errno.h>
38 #include <event.h>
39 #include <ifaddrs.h>
40 #include <imsg.h>
41 #include <limits.h>
42 #include <netdb.h>
43 #include <stdarg.h>
44 #include <stdlib.h>
45 #include <stdio.h>
46 #include <string.h>
47 #include <syslog.h>
48 #include <unistd.h>
49 
50 #include "got_reference.h"
51 
52 #include "gotwebd.h"
53 
54 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
55 static struct file {
56 	TAILQ_ENTRY(file)	 entry;
57 	FILE			*stream;
58 	char			*name;
59 	int			 lineno;
60 	int			 errors;
61 } *file;
62 struct file	*newfile(const char *, int);
63 static void	 closefile(struct file *);
64 int		 check_file_secrecy(int, const char *);
65 int		 yyparse(void);
66 int		 yylex(void);
67 int		 yyerror(const char *, ...)
68     __attribute__((__format__ (printf, 1, 2)))
69     __attribute__((__nonnull__ (1)));
70 int		 kw_cmp(const void *, const void *);
71 int		 lookup(char *);
72 int		 lgetc(int);
73 int		 lungetc(int);
74 int		 findeol(void);
75 
76 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
77 struct sym {
78 	TAILQ_ENTRY(sym)	 entry;
79 	int			 used;
80 	int			 persist;
81 	char			*nam;
82 	char			*val;
83 };
84 
85 int	 symset(const char *, const char *, int);
86 char	*symget(const char *);
87 
88 static int		 errors;
89 
90 static struct gotwebd		*gotwebd;
91 static struct server		*new_srv;
92 static struct server		*conf_new_server(const char *);
93 int				 getservice(const char *);
94 int				 n;
95 
96 int		 get_addrs(const char *, const char *, struct server *);
97 int		 addr_dup_check(struct addresslist *, struct address *,
98 		    const char *, const char *);
99 int		 add_addr(struct server *, struct address *);
100 
101 typedef struct {
102 	union {
103 		long long	 number;
104 		char		*string;
105 	} v;
106 	int lineno;
107 } YYSTYPE;
108 
109 %}
110 
111 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
112 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
113 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
114 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK RESPECT_EXPORTOK
115 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS SOCKET
116 %token	SUMMARY_COMMITS_DISPLAY SUMMARY_TAGS_DISPLAY
117 
118 %token	<v.string>	STRING
119 %token	<v.number>	NUMBER
120 %type	<v.number>	boolean
121 %type	<v.string>	listen_addr
122 
123 %%
124 
125 grammar		: /* empty */
126 		| grammar '\n'
127 		| grammar varset '\n'
128 		| grammar main '\n'
129 		| grammar server '\n'
130 		| grammar error '\n'		{ file->errors++; }
131 		;
132 
133 varset		: STRING '=' STRING	{
134 			char *s = $1;
135 			while (*s++) {
136 				if (isspace((unsigned char)*s)) {
137 					yyerror("macro name cannot contain "
138 					    "whitespace");
139 					free($1);
140 					free($3);
141 					YYERROR;
142 				}
143 			}
144 			if (symset($1, $3, 0) == -1)
145 				fatal("cannot store variable");
146 			free($1);
147 			free($3);
148 		}
149 		;
150 
151 boolean		: STRING {
152 			if (strcasecmp($1, "1") == 0 ||
153 			    strcasecmp($1, "on") == 0)
154 				$$ = 1;
155 			else if (strcasecmp($1, "0") == 0 ||
156 			    strcasecmp($1, "off") == 0)
157 				$$ = 0;
158 			else {
159 				yyerror("invalid boolean value '%s'", $1);
160 				free($1);
161 				YYERROR;
162 			}
163 			free($1);
164 		}
165 		| ON { $$ = 1; }
166 		| NUMBER {
167 			if ($1 != 0 && $1 != 1) {
168 				yyerror("invalid boolean value '%lld'", $1);
169 				YYERROR;
170 			}
171 			$$ = $1;
172 		}
173 		;
174 
175 listen_addr	: '*' { $$ = NULL; }
176 		| STRING
177 		;
178 
179 main		: PREFORK NUMBER {
180 			if ($2 <= 0 || $2 > PROC_MAX_INSTANCES) {
181 				yyerror("prefork is %s: %lld",
182 				    $2 <= 0 ? "too small" : "too large", $2);
183 				YYERROR;
184 			}
185 			gotwebd->prefork_gotwebd = $2;
186 		}
187 		| CHROOT STRING {
188 			if (*$2 == '\0') {
189 				yyerror("chroot path can't be an empty"
190 				    " string");
191 				free($2);
192 				YYERROR;
193 			}
194 
195 			n = strlcpy(gotwebd->httpd_chroot, $2,
196 			    sizeof(gotwebd->httpd_chroot));
197 			if (n >= sizeof(gotwebd->httpd_chroot)) {
198 				yyerror("%s: httpd_chroot truncated", __func__);
199 				free($2);
200 				YYERROR;
201 			}
202 			free($2);
203 		}
204 		| UNIX_SOCKET boolean {
205 			gotwebd->unix_socket = $2;
206 		}
207 		| UNIX_SOCKET_NAME STRING {
208 			n = snprintf(gotwebd->unix_socket_name,
209 			    sizeof(gotwebd->unix_socket_name), "%s%s",
210 			    gotwebd->httpd_chroot, $2);
211 			if (n < 0 ||
212 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
213 				yyerror("%s: unix_socket_name truncated",
214 				    __func__);
215 				free($2);
216 				YYERROR;
217 			}
218 			free($2);
219 		}
220 		;
221 
222 server		: SERVER STRING {
223 			struct server *srv;
224 
225 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
226 				if (strcmp(srv->name, $2) == 0) {
227 					yyerror("server name exists '%s'", $2);
228 					free($2);
229 					YYERROR;
230 				}
231 			}
232 
233 			new_srv = conf_new_server($2);
234 			log_debug("adding server %s", $2);
235 			free($2);
236 		}
237 		| SERVER STRING {
238 			struct server *srv;
239 
240 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
241 				if (strcmp(srv->name, $2) == 0) {
242 					yyerror("server name exists '%s'", $2);
243 					free($2);
244 					YYERROR;
245 				}
246 			}
247 
248 			new_srv = conf_new_server($2);
249 			log_debug("adding server %s", $2);
250 			free($2);
251 		} '{' optnl serveropts2 '}' {
252 		}
253 		;
254 
255 serveropts1	: REPOS_PATH STRING {
256 			n = strlcpy(new_srv->repos_path, $2,
257 			    sizeof(new_srv->repos_path));
258 			if (n >= sizeof(new_srv->repos_path)) {
259 				yyerror("%s: repos_path truncated", __func__);
260 				free($2);
261 				YYERROR;
262 			}
263 			free($2);
264 		}
265 		| SITE_NAME STRING {
266 			n = strlcpy(new_srv->site_name, $2,
267 			    sizeof(new_srv->site_name));
268 			if (n >= sizeof(new_srv->site_name)) {
269 				yyerror("%s: site_name truncated", __func__);
270 				free($2);
271 				YYERROR;
272 			}
273 			free($2);
274 		}
275 		| SITE_OWNER STRING {
276 			n = strlcpy(new_srv->site_owner, $2,
277 			    sizeof(new_srv->site_owner));
278 			if (n >= sizeof(new_srv->site_owner)) {
279 				yyerror("%s: site_owner truncated", __func__);
280 				free($2);
281 				YYERROR;
282 			}
283 			free($2);
284 		}
285 		| SITE_LINK STRING {
286 			n = strlcpy(new_srv->site_link, $2,
287 			    sizeof(new_srv->site_link));
288 			if (n >= sizeof(new_srv->site_link)) {
289 				yyerror("%s: site_link truncated", __func__);
290 				free($2);
291 				YYERROR;
292 			}
293 			free($2);
294 		}
295 		| LOGO STRING {
296 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
297 			if (n >= sizeof(new_srv->logo)) {
298 				yyerror("%s: logo truncated", __func__);
299 				free($2);
300 				YYERROR;
301 			}
302 			free($2);
303 		}
304 		| LOGO_URL STRING {
305 			n = strlcpy(new_srv->logo_url, $2,
306 			    sizeof(new_srv->logo_url));
307 			if (n >= sizeof(new_srv->logo_url)) {
308 				yyerror("%s: logo_url truncated", __func__);
309 				free($2);
310 				YYERROR;
311 			}
312 			free($2);
313 		}
314 		| CUSTOM_CSS STRING {
315 			n = strlcpy(new_srv->custom_css, $2,
316 			    sizeof(new_srv->custom_css));
317 			if (n >= sizeof(new_srv->custom_css)) {
318 				yyerror("%s: custom_css truncated", __func__);
319 				free($2);
320 				YYERROR;
321 			}
322 			free($2);
323 		}
324 		| LISTEN ON listen_addr PORT STRING {
325 			if (get_addrs($3, $5, new_srv) == -1) {
326 				yyerror("could not get addrs");
327 				YYERROR;
328 			}
329 			free($3);
330 			free($5);
331 			new_srv->fcgi_socket = 1;
332 		}
333 		| LISTEN ON listen_addr PORT NUMBER {
334 			char portno[32];
335 			int n;
336 
337 			n = snprintf(portno, sizeof(portno), "%lld",
338 			    (long long)$5);
339 			if (n < 0 || (size_t)n >= sizeof(portno))
340 				fatalx("port number too long: %lld",
341 				    (long long)$5);
342 
343 			if (get_addrs($3, portno, new_srv) == -1) {
344 				yyerror("could not get addrs");
345 				YYERROR;
346 			}
347 			free($3);
348 			new_srv->fcgi_socket = 1;
349 		}
350 		| LISTEN ON SOCKET STRING {
351 			if (strcasecmp($4, "off") == 0) {
352 				new_srv->unix_socket = 0;
353 				free($4);
354 				YYACCEPT;
355 			}
356 
357 			new_srv->unix_socket = 1;
358 
359 			n = snprintf(new_srv->unix_socket_name,
360 			    sizeof(new_srv->unix_socket_name), "%s%s",
361 			    gotwebd->httpd_chroot, $4);
362 			if (n < 0 ||
363 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
364 				yyerror("%s: unix_socket_name truncated",
365 				    __func__);
366 				free($4);
367 				YYERROR;
368 			}
369 			free($4);
370 		}
371 		| MAX_REPOS NUMBER {
372 			if ($2 <= 0) {
373 				yyerror("max_repos is too small: %lld", $2);
374 				YYERROR;
375 			}
376 			new_srv->max_repos = $2;
377 		}
378 		| SHOW_SITE_OWNER boolean {
379 			new_srv->show_site_owner = $2;
380 		}
381 		| SHOW_REPO_OWNER boolean {
382 			new_srv->show_repo_owner = $2;
383 		}
384 		| SHOW_REPO_AGE boolean {
385 			new_srv->show_repo_age = $2;
386 		}
387 		| SHOW_REPO_DESCRIPTION boolean {
388 			new_srv->show_repo_description = $2;
389 		}
390 		| SHOW_REPO_CLONEURL boolean {
391 			new_srv->show_repo_cloneurl = $2;
392 		}
393 		| RESPECT_EXPORTOK boolean {
394 			new_srv->respect_exportok = $2;
395 		}
396 		| MAX_REPOS_DISPLAY NUMBER {
397 			if ($2 < 0) {
398 				yyerror("max_repos_display is too small: %lld",
399 				    $2);
400 				YYERROR;
401 			}
402 			new_srv->max_repos_display = $2;
403 		}
404 		| MAX_COMMITS_DISPLAY NUMBER {
405 			if ($2 <= 1) {
406 				yyerror("max_commits_display is too small:"
407 				    " %lld", $2);
408 				YYERROR;
409 			}
410 			new_srv->max_commits_display = $2;
411 		}
412 		| SUMMARY_COMMITS_DISPLAY NUMBER {
413 			if ($2 < 1) {
414 				yyerror("summary_commits_display is too small:"
415 				    " %lld", $2);
416 				YYERROR;
417 			}
418 			new_srv->summary_commits_display = $2;
419 		}
420 		| SUMMARY_TAGS_DISPLAY NUMBER {
421 			if ($2 < 1) {
422 				yyerror("summary_tags_display is too small:"
423 				    " %lld", $2);
424 				YYERROR;
425 			}
426 			new_srv->summary_tags_display = $2;
427 		}
428 		;
429 
430 serveropts2	: serveropts2 serveropts1 nl
431 		| serveropts1 optnl
432 		;
433 
434 nl		: '\n' optnl
435 		;
436 
437 optnl		: '\n' optnl		/* zero or more newlines */
438 		| /* empty */
439 		;
440 
441 %%
442 
443 struct keywords {
444 	const char	*k_name;
445 	int		 k_val;
446 };
447 
448 int
449 yyerror(const char *fmt, ...)
450 {
451 	va_list ap;
452 	char *msg;
453 
454 	file->errors++;
455 	va_start(ap, fmt);
456 	if (vasprintf(&msg, fmt, ap) == -1)
457 		fatalx("yyerror vasprintf");
458 	va_end(ap);
459 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
460 	free(msg);
461 	return (0);
462 }
463 
464 int
465 kw_cmp(const void *k, const void *e)
466 {
467 	return (strcmp(k, ((const struct keywords *)e)->k_name));
468 }
469 
470 int
471 lookup(char *s)
472 {
473 	/* This has to be sorted always. */
474 	static const struct keywords keywords[] = {
475 		{ "chroot",			CHROOT },
476 		{ "custom_css",			CUSTOM_CSS },
477 		{ "listen",			LISTEN },
478 		{ "logo",			LOGO },
479 		{ "logo_url",			LOGO_URL },
480 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
481 		{ "max_repos",			MAX_REPOS },
482 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
483 		{ "on",				ON },
484 		{ "port",			PORT },
485 		{ "prefork",			PREFORK },
486 		{ "repos_path",			REPOS_PATH },
487 		{ "respect_exportok",		RESPECT_EXPORTOK },
488 		{ "server",			SERVER },
489 		{ "show_repo_age",		SHOW_REPO_AGE },
490 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
491 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
492 		{ "show_repo_owner",		SHOW_REPO_OWNER },
493 		{ "show_site_owner",		SHOW_SITE_OWNER },
494 		{ "site_link",			SITE_LINK },
495 		{ "site_name",			SITE_NAME },
496 		{ "site_owner",			SITE_OWNER },
497 		{ "socket",			SOCKET },
498 		{ "summary_commits_display",	SUMMARY_COMMITS_DISPLAY },
499 		{ "summary_tags_display",	SUMMARY_TAGS_DISPLAY },
500 		{ "unix_socket",		UNIX_SOCKET },
501 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
502 	};
503 	const struct keywords *p;
504 
505 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
506 	    sizeof(keywords[0]), kw_cmp);
507 
508 	if (p)
509 		return (p->k_val);
510 	else
511 		return (STRING);
512 }
513 
514 #define MAXPUSHBACK	128
515 
516 unsigned char *parsebuf;
517 int parseindex;
518 unsigned char pushback_buffer[MAXPUSHBACK];
519 int pushback_index = 0;
520 
521 int
522 lgetc(int quotec)
523 {
524 	int c, next;
525 
526 	if (parsebuf) {
527 		/* Read character from the parsebuffer instead of input. */
528 		if (parseindex >= 0) {
529 			c = parsebuf[parseindex++];
530 			if (c != '\0')
531 				return (c);
532 			parsebuf = NULL;
533 		} else
534 			parseindex++;
535 	}
536 
537 	if (pushback_index)
538 		return (pushback_buffer[--pushback_index]);
539 
540 	if (quotec) {
541 		c = getc(file->stream);
542 		if (c == EOF)
543 			yyerror("reached end of file while parsing "
544 			    "quoted string");
545 		return (c);
546 	}
547 
548 	c = getc(file->stream);
549 	while (c == '\\') {
550 		next = getc(file->stream);
551 		if (next != '\n') {
552 			c = next;
553 			break;
554 		}
555 		yylval.lineno = file->lineno;
556 		file->lineno++;
557 		c = getc(file->stream);
558 	}
559 
560 	return (c);
561 }
562 
563 int
564 lungetc(int c)
565 {
566 	if (c == EOF)
567 		return (EOF);
568 	if (parsebuf) {
569 		parseindex--;
570 		if (parseindex >= 0)
571 			return (c);
572 	}
573 	if (pushback_index < MAXPUSHBACK-1)
574 		return (pushback_buffer[pushback_index++] = c);
575 	else
576 		return (EOF);
577 }
578 
579 int
580 findeol(void)
581 {
582 	int c;
583 
584 	parsebuf = NULL;
585 
586 	/* Skip to either EOF or the first real EOL. */
587 	while (1) {
588 		if (pushback_index)
589 			c = pushback_buffer[--pushback_index];
590 		else
591 			c = lgetc(0);
592 		if (c == '\n') {
593 			file->lineno++;
594 			break;
595 		}
596 		if (c == EOF)
597 			break;
598 	}
599 	return (ERROR);
600 }
601 
602 int
603 yylex(void)
604 {
605 	unsigned char buf[8096];
606 	unsigned char *p, *val;
607 	int quotec, next, c;
608 	int token;
609 
610 top:
611 	p = buf;
612 	c = lgetc(0);
613 	while (c == ' ' || c == '\t')
614 		c = lgetc(0); /* nothing */
615 
616 	yylval.lineno = file->lineno;
617 	if (c == '#') {
618 		c = lgetc(0);
619 		while (c != '\n' && c != EOF)
620 			c = lgetc(0); /* nothing */
621 	}
622 	if (c == '$' && parsebuf == NULL) {
623 		while (1) {
624 			c = lgetc(0);
625 			if (c == EOF)
626 				return (0);
627 
628 			if (p + 1 >= buf + sizeof(buf) - 1) {
629 				yyerror("string too long");
630 				return (findeol());
631 			}
632 			if (isalnum(c) || c == '_') {
633 				*p++ = c;
634 				continue;
635 			}
636 			*p = '\0';
637 			lungetc(c);
638 			break;
639 		}
640 		val = symget(buf);
641 		if (val == NULL) {
642 			yyerror("macro '%s' not defined", buf);
643 			return (findeol());
644 		}
645 		parsebuf = val;
646 		parseindex = 0;
647 		goto top;
648 	}
649 
650 	switch (c) {
651 	case '\'':
652 	case '"':
653 		quotec = c;
654 		while (1) {
655 			c = lgetc(quotec);
656 			if (c == EOF)
657 				return (0);
658 			if (c == '\n') {
659 				file->lineno++;
660 				continue;
661 			} else if (c == '\\') {
662 				next = lgetc(quotec);
663 				if (next == EOF)
664 					return (0);
665 				if (next == quotec || c == ' ' || c == '\t')
666 					c = next;
667 				else if (next == '\n') {
668 					file->lineno++;
669 					continue;
670 				} else
671 					lungetc(next);
672 			} else if (c == quotec) {
673 				*p = '\0';
674 				break;
675 			} else if (c == '\0') {
676 				yyerror("syntax error");
677 				return (findeol());
678 			}
679 			if (p + 1 >= buf + sizeof(buf) - 1) {
680 				yyerror("string too long");
681 				return (findeol());
682 			}
683 			*p++ = c;
684 		}
685 		yylval.v.string = strdup(buf);
686 		if (yylval.v.string == NULL)
687 			err(1, "yylex: strdup");
688 		return (STRING);
689 	}
690 
691 #define allowed_to_end_number(x) \
692 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
693 
694 	if (c == '-' || isdigit(c)) {
695 		do {
696 			*p++ = c;
697 			if ((unsigned)(p-buf) >= sizeof(buf)) {
698 				yyerror("string too long");
699 				return (findeol());
700 			}
701 			c = lgetc(0);
702 		} while (c != EOF && isdigit(c));
703 		lungetc(c);
704 		if (p == buf + 1 && buf[0] == '-')
705 			goto nodigits;
706 		if (c == EOF || allowed_to_end_number(c)) {
707 			const char *errstr = NULL;
708 
709 			*p = '\0';
710 			yylval.v.number = strtonum(buf, LLONG_MIN,
711 			    LLONG_MAX, &errstr);
712 			if (errstr) {
713 				yyerror("\"%s\" invalid number: %s",
714 				    buf, errstr);
715 				return (findeol());
716 			}
717 			return (NUMBER);
718 		} else {
719 nodigits:
720 			while (p > buf + 1)
721 				lungetc(*--p);
722 			c = *--p;
723 			if (c == '-')
724 				return (c);
725 		}
726 	}
727 
728 #define allowed_in_string(x) \
729 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
730 	x != '{' && x != '}' && \
731 	x != '!' && x != '=' && x != '#' && \
732 	x != ','))
733 
734 	if (isalnum(c) || c == ':' || c == '_') {
735 		do {
736 			*p++ = c;
737 			if ((unsigned)(p-buf) >= sizeof(buf)) {
738 				yyerror("string too long");
739 				return (findeol());
740 			}
741 			c = lgetc(0);
742 		} while (c != EOF && (allowed_in_string(c)));
743 		lungetc(c);
744 		*p = '\0';
745 		token = lookup(buf);
746 		if (token == STRING) {
747 			yylval.v.string = strdup(buf);
748 			if (yylval.v.string == NULL)
749 				err(1, "yylex: strdup");
750 		}
751 		return (token);
752 	}
753 	if (c == '\n') {
754 		yylval.lineno = file->lineno;
755 		file->lineno++;
756 	}
757 	if (c == EOF)
758 		return (0);
759 	return (c);
760 }
761 
762 int
763 check_file_secrecy(int fd, const char *fname)
764 {
765 	struct stat st;
766 
767 	if (fstat(fd, &st)) {
768 		log_warn("cannot stat %s", fname);
769 		return (-1);
770 	}
771 	if (st.st_uid != 0 && st.st_uid != getuid()) {
772 		log_warnx("%s: owner not root or current user", fname);
773 		return (-1);
774 	}
775 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
776 		log_warnx("%s: group writable or world read/writable", fname);
777 		return (-1);
778 	}
779 	return (0);
780 }
781 
782 struct file *
783 newfile(const char *name, int secret)
784 {
785 	struct file *nfile;
786 
787 	nfile = calloc(1, sizeof(struct file));
788 	if (nfile == NULL) {
789 		log_warn("calloc");
790 		return (NULL);
791 	}
792 	nfile->name = strdup(name);
793 	if (nfile->name == NULL) {
794 		log_warn("strdup");
795 		free(nfile);
796 		return (NULL);
797 	}
798 	nfile->stream = fopen(nfile->name, "r");
799 	if (nfile->stream == NULL) {
800 		/* no warning, we don't require a conf file */
801 		free(nfile->name);
802 		free(nfile);
803 		return (NULL);
804 	} else if (secret &&
805 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
806 		fclose(nfile->stream);
807 		free(nfile->name);
808 		free(nfile);
809 		return (NULL);
810 	}
811 	nfile->lineno = 1;
812 	return (nfile);
813 }
814 
815 static void
816 closefile(struct file *xfile)
817 {
818 	fclose(xfile->stream);
819 	free(xfile->name);
820 	free(xfile);
821 }
822 
823 static void
824 add_default_server(void)
825 {
826 	new_srv = conf_new_server(D_SITENAME);
827 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
828 }
829 
830 int
831 parse_config(const char *filename, struct gotwebd *env)
832 {
833 	struct sym *sym, *next;
834 
835 	if (config_init(env) == -1)
836 		fatalx("failed to initialize configuration");
837 
838 	gotwebd = env;
839 
840 	file = newfile(filename, 0);
841 	if (file == NULL) {
842 		add_default_server();
843 		sockets_parse_sockets(env);
844 		/* just return, as we don't require a conf file */
845 		return (0);
846 	}
847 
848 	yyparse();
849 	errors = file->errors;
850 	closefile(file);
851 
852 	/* Free macros and check which have not been used. */
853 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
854 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
855 			fprintf(stderr, "warning: macro '%s' not used\n",
856 			    sym->nam);
857 		if (!sym->persist) {
858 			free(sym->nam);
859 			free(sym->val);
860 			TAILQ_REMOVE(&symhead, sym, entry);
861 			free(sym);
862 		}
863 	}
864 
865 	if (errors)
866 		return (-1);
867 
868 	/* just add default server if no config specified */
869 	if (gotwebd->server_cnt == 0)
870 		add_default_server();
871 
872 	/* setup our listening sockets */
873 	sockets_parse_sockets(env);
874 
875 	return (0);
876 }
877 
878 struct server *
879 conf_new_server(const char *name)
880 {
881 	struct server *srv = NULL;
882 
883 	srv = calloc(1, sizeof(*srv));
884 	if (srv == NULL)
885 		fatalx("%s: calloc", __func__);
886 
887 	n = strlcpy(srv->name, name, sizeof(srv->name));
888 	if (n >= sizeof(srv->name))
889 		fatalx("%s: strlcpy", __func__);
890 	n = snprintf(srv->unix_socket_name,
891 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
892 	    D_UNIX_SOCKET);
893 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
894 		fatalx("%s: snprintf", __func__);
895 	n = strlcpy(srv->repos_path, D_GOTPATH,
896 	    sizeof(srv->repos_path));
897 	if (n >= sizeof(srv->repos_path))
898 		fatalx("%s: strlcpy", __func__);
899 	n = strlcpy(srv->site_name, D_SITENAME,
900 	    sizeof(srv->site_name));
901 	if (n >= sizeof(srv->site_name))
902 		fatalx("%s: strlcpy", __func__);
903 	n = strlcpy(srv->site_owner, D_SITEOWNER,
904 	    sizeof(srv->site_owner));
905 	if (n >= sizeof(srv->site_owner))
906 		fatalx("%s: strlcpy", __func__);
907 	n = strlcpy(srv->site_link, D_SITELINK,
908 	    sizeof(srv->site_link));
909 	if (n >= sizeof(srv->site_link))
910 		fatalx("%s: strlcpy", __func__);
911 	n = strlcpy(srv->logo, D_GOTLOGO,
912 	    sizeof(srv->logo));
913 	if (n >= sizeof(srv->logo))
914 		fatalx("%s: strlcpy", __func__);
915 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
916 	if (n >= sizeof(srv->logo_url))
917 		fatalx("%s: strlcpy", __func__);
918 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
919 	if (n >= sizeof(srv->custom_css))
920 		fatalx("%s: strlcpy", __func__);
921 
922 	srv->show_site_owner = D_SHOWSOWNER;
923 	srv->show_repo_owner = D_SHOWROWNER;
924 	srv->show_repo_age = D_SHOWAGE;
925 	srv->show_repo_description = D_SHOWDESC;
926 	srv->show_repo_cloneurl = D_SHOWURL;
927 	srv->respect_exportok = D_RESPECTEXPORTOK;
928 
929 	srv->max_repos_display = D_MAXREPODISP;
930 	srv->max_commits_display = D_MAXCOMMITDISP;
931 	srv->summary_commits_display = D_MAXSLCOMMDISP;
932 	srv->summary_tags_display = D_MAXSLTAGDISP;
933 	srv->max_repos = D_MAXREPO;
934 
935 	srv->unix_socket = 1;
936 	srv->fcgi_socket = 0;
937 
938 	TAILQ_INIT(&srv->al);
939 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
940 	gotwebd->server_cnt++;
941 
942 	return srv;
943 };
944 
945 int
946 symset(const char *nam, const char *val, int persist)
947 {
948 	struct sym *sym;
949 
950 	TAILQ_FOREACH(sym, &symhead, entry) {
951 		if (strcmp(nam, sym->nam) == 0)
952 			break;
953 	}
954 
955 	if (sym != NULL) {
956 		if (sym->persist == 1)
957 			return (0);
958 		else {
959 			free(sym->nam);
960 			free(sym->val);
961 			TAILQ_REMOVE(&symhead, sym, entry);
962 			free(sym);
963 		}
964 	}
965 	sym = calloc(1, sizeof(*sym));
966 	if (sym == NULL)
967 		return (-1);
968 
969 	sym->nam = strdup(nam);
970 	if (sym->nam == NULL) {
971 		free(sym);
972 		return (-1);
973 	}
974 	sym->val = strdup(val);
975 	if (sym->val == NULL) {
976 		free(sym->nam);
977 		free(sym);
978 		return (-1);
979 	}
980 	sym->used = 0;
981 	sym->persist = persist;
982 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
983 	return (0);
984 }
985 
986 int
987 cmdline_symset(char *s)
988 {
989 	char *sym, *val;
990 	int ret;
991 
992 	val = strrchr(s, '=');
993 	if (val == NULL)
994 		return (-1);
995 
996 	sym = strndup(s, val - s);
997 	if (sym == NULL)
998 		fatal("%s: strndup", __func__);
999 
1000 	ret = symset(sym, val + 1, 1);
1001 	free(sym);
1002 
1003 	return (ret);
1004 }
1005 
1006 char *
1007 symget(const char *nam)
1008 {
1009 	struct sym *sym;
1010 
1011 	TAILQ_FOREACH(sym, &symhead, entry) {
1012 		if (strcmp(nam, sym->nam) == 0) {
1013 			sym->used = 1;
1014 			return (sym->val);
1015 		}
1016 	}
1017 	return (NULL);
1018 }
1019 
1020 int
1021 get_addrs(const char *hostname, const char *servname, struct server *new_srv)
1022 {
1023 	struct addrinfo hints, *res0, *res;
1024 	int error;
1025 	struct sockaddr_in *sin;
1026 	struct sockaddr_in6 *sin6;
1027 	struct address *h;
1028 
1029 	memset(&hints, 0, sizeof(hints));
1030 	hints.ai_family = AF_UNSPEC;
1031 	hints.ai_socktype = SOCK_STREAM;
1032 	hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
1033 	error = getaddrinfo(hostname, servname, &hints, &res0);
1034 	if (error) {
1035 		log_warnx("%s: could not parse \"%s:%s\": %s", __func__,
1036 		    hostname, servname, gai_strerror(error));
1037 		return (-1);
1038 	}
1039 
1040 	for (res = res0; res; res = res->ai_next) {
1041 		if ((h = calloc(1, sizeof(*h))) == NULL)
1042 			fatal(__func__);
1043 
1044 		if (hostname == NULL) {
1045 			strlcpy(h->ifname, "*", sizeof(h->ifname));
1046 		} else {
1047 			if (strlcpy(h->ifname, hostname, sizeof(h->ifname)) >=
1048 			    sizeof(h->ifname)) {
1049 				log_warnx("%s: address truncated: %s",
1050 				    __func__, hostname);
1051 				freeaddrinfo(res0);
1052 				free(h);
1053 				return (-1);
1054 			}
1055 		}
1056 
1057 		h->ai_family = res->ai_family;
1058 		h->ai_socktype = res->ai_socktype;
1059 		h->ai_protocol = res->ai_protocol;
1060 		memcpy(&h->ss, res->ai_addr, res->ai_addrlen);
1061 		h->slen = res->ai_addrlen;
1062 
1063 		switch (res->ai_family) {
1064 		case AF_INET:
1065 			sin = (struct sockaddr_in *)res->ai_addr;
1066 			h->port = ntohs(sin->sin_port);
1067 			break;
1068 		case AF_INET6:
1069 			sin6 = (struct sockaddr_in6 *)res->ai_addr;
1070 			h->port = ntohs(sin6->sin6_port);
1071 			break;
1072 		default:
1073 			fatalx("unknown address family %d", res->ai_family);
1074 		}
1075 
1076 		if (add_addr(new_srv, h))
1077 			return -1;
1078 	}
1079 	freeaddrinfo(res0);
1080 	return (0);
1081 }
1082 
1083 int
1084 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1085     const char *other_srv)
1086 {
1087 	struct address *a;
1088 	void *ia;
1089 	char buf[INET6_ADDRSTRLEN];
1090 	const char *addrstr;
1091 
1092 	TAILQ_FOREACH(a, al, entry) {
1093 		if (a->ai_family != h->ai_family ||
1094 		    a->ai_socktype != h->ai_socktype ||
1095 		    a->ai_protocol != h->ai_protocol ||
1096 		    a->slen != h->slen ||
1097 		    memcmp(&a->ss, &h->ss, a->slen) != 0)
1098 			continue;
1099 
1100 		switch (h->ss.ss_family) {
1101 		case AF_INET:
1102 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1103 			break;
1104 		case AF_INET6:
1105 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1106 			break;
1107 		default:
1108 			yyerror("unknown address family: %d", h->ss.ss_family);
1109 			return -1;
1110 		}
1111 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1112 		if (addrstr) {
1113 			if (other_srv) {
1114 				yyerror("server %s: duplicate fcgi listen "
1115 				    "address %s:%d, already used by server %s",
1116 				    new_srv, addrstr, h->port, other_srv);
1117 			} else {
1118 				log_warnx("server: %s: duplicate fcgi listen "
1119 				    "address %s:%d", new_srv, addrstr, h->port);
1120 			}
1121 		} else {
1122 			if (other_srv) {
1123 				yyerror("server: %s: duplicate fcgi listen "
1124 				    "address, already used by server %s",
1125 				    new_srv, other_srv);
1126 			} else {
1127 				log_warnx("server %s: duplicate fcgi listen "
1128 				    "address", new_srv);
1129 			}
1130 		}
1131 
1132 		return -1;
1133 	}
1134 
1135 	return 0;
1136 }
1137 
1138 int
1139 add_addr(struct server *new_srv, struct address *h)
1140 {
1141 	struct server *srv;
1142 
1143 	/* Address cannot be shared between different servers. */
1144 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1145 		if (srv == new_srv)
1146 			continue;
1147 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1148 			return -1;
1149 	}
1150 
1151 	/* Tolerate duplicate address lines within the scope of a server. */
1152 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1153 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1154 	else
1155 		free(h);
1156 
1157 	return 0;
1158 }