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