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 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 		| SHOW_SITE_OWNER boolean {
372 			new_srv->show_site_owner = $2;
373 		}
374 		| SHOW_REPO_OWNER boolean {
375 			new_srv->show_repo_owner = $2;
376 		}
377 		| SHOW_REPO_AGE boolean {
378 			new_srv->show_repo_age = $2;
379 		}
380 		| SHOW_REPO_DESCRIPTION boolean {
381 			new_srv->show_repo_description = $2;
382 		}
383 		| SHOW_REPO_CLONEURL boolean {
384 			new_srv->show_repo_cloneurl = $2;
385 		}
386 		| RESPECT_EXPORTOK boolean {
387 			new_srv->respect_exportok = $2;
388 		}
389 		| MAX_REPOS_DISPLAY NUMBER {
390 			if ($2 < 0) {
391 				yyerror("max_repos_display is too small: %lld",
392 				    $2);
393 				YYERROR;
394 			}
395 			new_srv->max_repos_display = $2;
396 		}
397 		| MAX_COMMITS_DISPLAY NUMBER {
398 			if ($2 <= 1) {
399 				yyerror("max_commits_display is too small:"
400 				    " %lld", $2);
401 				YYERROR;
402 			}
403 			new_srv->max_commits_display = $2;
404 		}
405 		| SUMMARY_COMMITS_DISPLAY NUMBER {
406 			if ($2 < 1) {
407 				yyerror("summary_commits_display is too small:"
408 				    " %lld", $2);
409 				YYERROR;
410 			}
411 			new_srv->summary_commits_display = $2;
412 		}
413 		| SUMMARY_TAGS_DISPLAY NUMBER {
414 			if ($2 < 1) {
415 				yyerror("summary_tags_display is too small:"
416 				    " %lld", $2);
417 				YYERROR;
418 			}
419 			new_srv->summary_tags_display = $2;
420 		}
421 		;
422 
423 serveropts2	: serveropts2 serveropts1 nl
424 		| serveropts1 optnl
425 		;
426 
427 nl		: '\n' optnl
428 		;
429 
430 optnl		: '\n' optnl		/* zero or more newlines */
431 		| /* empty */
432 		;
433 
434 %%
435 
436 struct keywords {
437 	const char	*k_name;
438 	int		 k_val;
439 };
440 
441 int
442 yyerror(const char *fmt, ...)
443 {
444 	va_list ap;
445 	char *msg;
446 
447 	file->errors++;
448 	va_start(ap, fmt);
449 	if (vasprintf(&msg, fmt, ap) == -1)
450 		fatalx("yyerror vasprintf");
451 	va_end(ap);
452 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
453 	free(msg);
454 	return (0);
455 }
456 
457 int
458 kw_cmp(const void *k, const void *e)
459 {
460 	return (strcmp(k, ((const struct keywords *)e)->k_name));
461 }
462 
463 int
464 lookup(char *s)
465 {
466 	/* This has to be sorted always. */
467 	static const struct keywords keywords[] = {
468 		{ "chroot",			CHROOT },
469 		{ "custom_css",			CUSTOM_CSS },
470 		{ "listen",			LISTEN },
471 		{ "logo",			LOGO },
472 		{ "logo_url",			LOGO_URL },
473 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
474 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
475 		{ "on",				ON },
476 		{ "port",			PORT },
477 		{ "prefork",			PREFORK },
478 		{ "repos_path",			REPOS_PATH },
479 		{ "respect_exportok",		RESPECT_EXPORTOK },
480 		{ "server",			SERVER },
481 		{ "show_repo_age",		SHOW_REPO_AGE },
482 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
483 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
484 		{ "show_repo_owner",		SHOW_REPO_OWNER },
485 		{ "show_site_owner",		SHOW_SITE_OWNER },
486 		{ "site_link",			SITE_LINK },
487 		{ "site_name",			SITE_NAME },
488 		{ "site_owner",			SITE_OWNER },
489 		{ "socket",			SOCKET },
490 		{ "summary_commits_display",	SUMMARY_COMMITS_DISPLAY },
491 		{ "summary_tags_display",	SUMMARY_TAGS_DISPLAY },
492 		{ "unix_socket",		UNIX_SOCKET },
493 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
494 	};
495 	const struct keywords *p;
496 
497 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
498 	    sizeof(keywords[0]), kw_cmp);
499 
500 	if (p)
501 		return (p->k_val);
502 	else
503 		return (STRING);
504 }
505 
506 #define MAXPUSHBACK	128
507 
508 unsigned char *parsebuf;
509 int parseindex;
510 unsigned char pushback_buffer[MAXPUSHBACK];
511 int pushback_index = 0;
512 
513 int
514 lgetc(int quotec)
515 {
516 	int c, next;
517 
518 	if (parsebuf) {
519 		/* Read character from the parsebuffer instead of input. */
520 		if (parseindex >= 0) {
521 			c = parsebuf[parseindex++];
522 			if (c != '\0')
523 				return (c);
524 			parsebuf = NULL;
525 		} else
526 			parseindex++;
527 	}
528 
529 	if (pushback_index)
530 		return (pushback_buffer[--pushback_index]);
531 
532 	if (quotec) {
533 		c = getc(file->stream);
534 		if (c == EOF)
535 			yyerror("reached end of file while parsing "
536 			    "quoted string");
537 		return (c);
538 	}
539 
540 	c = getc(file->stream);
541 	while (c == '\\') {
542 		next = getc(file->stream);
543 		if (next != '\n') {
544 			c = next;
545 			break;
546 		}
547 		yylval.lineno = file->lineno;
548 		file->lineno++;
549 		c = getc(file->stream);
550 	}
551 
552 	return (c);
553 }
554 
555 int
556 lungetc(int c)
557 {
558 	if (c == EOF)
559 		return (EOF);
560 	if (parsebuf) {
561 		parseindex--;
562 		if (parseindex >= 0)
563 			return (c);
564 	}
565 	if (pushback_index < MAXPUSHBACK-1)
566 		return (pushback_buffer[pushback_index++] = c);
567 	else
568 		return (EOF);
569 }
570 
571 int
572 findeol(void)
573 {
574 	int c;
575 
576 	parsebuf = NULL;
577 
578 	/* Skip to either EOF or the first real EOL. */
579 	while (1) {
580 		if (pushback_index)
581 			c = pushback_buffer[--pushback_index];
582 		else
583 			c = lgetc(0);
584 		if (c == '\n') {
585 			file->lineno++;
586 			break;
587 		}
588 		if (c == EOF)
589 			break;
590 	}
591 	return (ERROR);
592 }
593 
594 int
595 yylex(void)
596 {
597 	unsigned char buf[8096];
598 	unsigned char *p, *val;
599 	int quotec, next, c;
600 	int token;
601 
602 top:
603 	p = buf;
604 	c = lgetc(0);
605 	while (c == ' ' || c == '\t')
606 		c = lgetc(0); /* nothing */
607 
608 	yylval.lineno = file->lineno;
609 	if (c == '#') {
610 		c = lgetc(0);
611 		while (c != '\n' && c != EOF)
612 			c = lgetc(0); /* nothing */
613 	}
614 	if (c == '$' && parsebuf == NULL) {
615 		while (1) {
616 			c = lgetc(0);
617 			if (c == EOF)
618 				return (0);
619 
620 			if (p + 1 >= buf + sizeof(buf) - 1) {
621 				yyerror("string too long");
622 				return (findeol());
623 			}
624 			if (isalnum(c) || c == '_') {
625 				*p++ = c;
626 				continue;
627 			}
628 			*p = '\0';
629 			lungetc(c);
630 			break;
631 		}
632 		val = symget(buf);
633 		if (val == NULL) {
634 			yyerror("macro '%s' not defined", buf);
635 			return (findeol());
636 		}
637 		parsebuf = val;
638 		parseindex = 0;
639 		goto top;
640 	}
641 
642 	switch (c) {
643 	case '\'':
644 	case '"':
645 		quotec = c;
646 		while (1) {
647 			c = lgetc(quotec);
648 			if (c == EOF)
649 				return (0);
650 			if (c == '\n') {
651 				file->lineno++;
652 				continue;
653 			} else if (c == '\\') {
654 				next = lgetc(quotec);
655 				if (next == EOF)
656 					return (0);
657 				if (next == quotec || c == ' ' || c == '\t')
658 					c = next;
659 				else if (next == '\n') {
660 					file->lineno++;
661 					continue;
662 				} else
663 					lungetc(next);
664 			} else if (c == quotec) {
665 				*p = '\0';
666 				break;
667 			} else if (c == '\0') {
668 				yyerror("syntax error");
669 				return (findeol());
670 			}
671 			if (p + 1 >= buf + sizeof(buf) - 1) {
672 				yyerror("string too long");
673 				return (findeol());
674 			}
675 			*p++ = c;
676 		}
677 		yylval.v.string = strdup(buf);
678 		if (yylval.v.string == NULL)
679 			err(1, "yylex: strdup");
680 		return (STRING);
681 	}
682 
683 #define allowed_to_end_number(x) \
684 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
685 
686 	if (c == '-' || isdigit(c)) {
687 		do {
688 			*p++ = c;
689 			if ((unsigned)(p-buf) >= sizeof(buf)) {
690 				yyerror("string too long");
691 				return (findeol());
692 			}
693 			c = lgetc(0);
694 		} while (c != EOF && isdigit(c));
695 		lungetc(c);
696 		if (p == buf + 1 && buf[0] == '-')
697 			goto nodigits;
698 		if (c == EOF || allowed_to_end_number(c)) {
699 			const char *errstr = NULL;
700 
701 			*p = '\0';
702 			yylval.v.number = strtonum(buf, LLONG_MIN,
703 			    LLONG_MAX, &errstr);
704 			if (errstr) {
705 				yyerror("\"%s\" invalid number: %s",
706 				    buf, errstr);
707 				return (findeol());
708 			}
709 			return (NUMBER);
710 		} else {
711 nodigits:
712 			while (p > buf + 1)
713 				lungetc(*--p);
714 			c = *--p;
715 			if (c == '-')
716 				return (c);
717 		}
718 	}
719 
720 #define allowed_in_string(x) \
721 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
722 	x != '{' && x != '}' && \
723 	x != '!' && x != '=' && x != '#' && \
724 	x != ','))
725 
726 	if (isalnum(c) || c == ':' || c == '_') {
727 		do {
728 			*p++ = c;
729 			if ((unsigned)(p-buf) >= sizeof(buf)) {
730 				yyerror("string too long");
731 				return (findeol());
732 			}
733 			c = lgetc(0);
734 		} while (c != EOF && (allowed_in_string(c)));
735 		lungetc(c);
736 		*p = '\0';
737 		token = lookup(buf);
738 		if (token == STRING) {
739 			yylval.v.string = strdup(buf);
740 			if (yylval.v.string == NULL)
741 				err(1, "yylex: strdup");
742 		}
743 		return (token);
744 	}
745 	if (c == '\n') {
746 		yylval.lineno = file->lineno;
747 		file->lineno++;
748 	}
749 	if (c == EOF)
750 		return (0);
751 	return (c);
752 }
753 
754 int
755 check_file_secrecy(int fd, const char *fname)
756 {
757 	struct stat st;
758 
759 	if (fstat(fd, &st)) {
760 		log_warn("cannot stat %s", fname);
761 		return (-1);
762 	}
763 	if (st.st_uid != 0 && st.st_uid != getuid()) {
764 		log_warnx("%s: owner not root or current user", fname);
765 		return (-1);
766 	}
767 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
768 		log_warnx("%s: group writable or world read/writable", fname);
769 		return (-1);
770 	}
771 	return (0);
772 }
773 
774 struct file *
775 newfile(const char *name, int secret)
776 {
777 	struct file *nfile;
778 
779 	nfile = calloc(1, sizeof(struct file));
780 	if (nfile == NULL) {
781 		log_warn("calloc");
782 		return (NULL);
783 	}
784 	nfile->name = strdup(name);
785 	if (nfile->name == NULL) {
786 		log_warn("strdup");
787 		free(nfile);
788 		return (NULL);
789 	}
790 	nfile->stream = fopen(nfile->name, "r");
791 	if (nfile->stream == NULL) {
792 		/* no warning, we don't require a conf file */
793 		free(nfile->name);
794 		free(nfile);
795 		return (NULL);
796 	} else if (secret &&
797 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
798 		fclose(nfile->stream);
799 		free(nfile->name);
800 		free(nfile);
801 		return (NULL);
802 	}
803 	nfile->lineno = 1;
804 	return (nfile);
805 }
806 
807 static void
808 closefile(struct file *xfile)
809 {
810 	fclose(xfile->stream);
811 	free(xfile->name);
812 	free(xfile);
813 }
814 
815 static void
816 add_default_server(void)
817 {
818 	new_srv = conf_new_server(D_SITENAME);
819 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
820 }
821 
822 int
823 parse_config(const char *filename, struct gotwebd *env)
824 {
825 	struct sym *sym, *next;
826 
827 	if (config_init(env) == -1)
828 		fatalx("failed to initialize configuration");
829 
830 	gotwebd = env;
831 
832 	file = newfile(filename, 0);
833 	if (file == NULL) {
834 		add_default_server();
835 		sockets_parse_sockets(env);
836 		/* just return, as we don't require a conf file */
837 		return (0);
838 	}
839 
840 	yyparse();
841 	errors = file->errors;
842 	closefile(file);
843 
844 	/* Free macros and check which have not been used. */
845 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
846 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
847 			fprintf(stderr, "warning: macro '%s' not used\n",
848 			    sym->nam);
849 		if (!sym->persist) {
850 			free(sym->nam);
851 			free(sym->val);
852 			TAILQ_REMOVE(&symhead, sym, entry);
853 			free(sym);
854 		}
855 	}
856 
857 	if (errors)
858 		return (-1);
859 
860 	/* just add default server if no config specified */
861 	if (gotwebd->server_cnt == 0)
862 		add_default_server();
863 
864 	/* setup our listening sockets */
865 	sockets_parse_sockets(env);
866 
867 	return (0);
868 }
869 
870 struct server *
871 conf_new_server(const char *name)
872 {
873 	struct server *srv = NULL;
874 
875 	srv = calloc(1, sizeof(*srv));
876 	if (srv == NULL)
877 		fatalx("%s: calloc", __func__);
878 
879 	n = strlcpy(srv->name, name, sizeof(srv->name));
880 	if (n >= sizeof(srv->name))
881 		fatalx("%s: strlcpy", __func__);
882 	n = snprintf(srv->unix_socket_name,
883 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
884 	    D_UNIX_SOCKET);
885 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
886 		fatalx("%s: snprintf", __func__);
887 	n = strlcpy(srv->repos_path, D_GOTPATH,
888 	    sizeof(srv->repos_path));
889 	if (n >= sizeof(srv->repos_path))
890 		fatalx("%s: strlcpy", __func__);
891 	n = strlcpy(srv->site_name, D_SITENAME,
892 	    sizeof(srv->site_name));
893 	if (n >= sizeof(srv->site_name))
894 		fatalx("%s: strlcpy", __func__);
895 	n = strlcpy(srv->site_owner, D_SITEOWNER,
896 	    sizeof(srv->site_owner));
897 	if (n >= sizeof(srv->site_owner))
898 		fatalx("%s: strlcpy", __func__);
899 	n = strlcpy(srv->site_link, D_SITELINK,
900 	    sizeof(srv->site_link));
901 	if (n >= sizeof(srv->site_link))
902 		fatalx("%s: strlcpy", __func__);
903 	n = strlcpy(srv->logo, D_GOTLOGO,
904 	    sizeof(srv->logo));
905 	if (n >= sizeof(srv->logo))
906 		fatalx("%s: strlcpy", __func__);
907 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
908 	if (n >= sizeof(srv->logo_url))
909 		fatalx("%s: strlcpy", __func__);
910 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
911 	if (n >= sizeof(srv->custom_css))
912 		fatalx("%s: strlcpy", __func__);
913 
914 	srv->show_site_owner = D_SHOWSOWNER;
915 	srv->show_repo_owner = D_SHOWROWNER;
916 	srv->show_repo_age = D_SHOWAGE;
917 	srv->show_repo_description = D_SHOWDESC;
918 	srv->show_repo_cloneurl = D_SHOWURL;
919 	srv->respect_exportok = D_RESPECTEXPORTOK;
920 
921 	srv->max_repos_display = D_MAXREPODISP;
922 	srv->max_commits_display = D_MAXCOMMITDISP;
923 	srv->summary_commits_display = D_MAXSLCOMMDISP;
924 	srv->summary_tags_display = D_MAXSLTAGDISP;
925 
926 	srv->unix_socket = 1;
927 	srv->fcgi_socket = 0;
928 
929 	TAILQ_INIT(&srv->al);
930 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
931 	gotwebd->server_cnt++;
932 
933 	return srv;
934 };
935 
936 int
937 symset(const char *nam, const char *val, int persist)
938 {
939 	struct sym *sym;
940 
941 	TAILQ_FOREACH(sym, &symhead, entry) {
942 		if (strcmp(nam, sym->nam) == 0)
943 			break;
944 	}
945 
946 	if (sym != NULL) {
947 		if (sym->persist == 1)
948 			return (0);
949 		else {
950 			free(sym->nam);
951 			free(sym->val);
952 			TAILQ_REMOVE(&symhead, sym, entry);
953 			free(sym);
954 		}
955 	}
956 	sym = calloc(1, sizeof(*sym));
957 	if (sym == NULL)
958 		return (-1);
959 
960 	sym->nam = strdup(nam);
961 	if (sym->nam == NULL) {
962 		free(sym);
963 		return (-1);
964 	}
965 	sym->val = strdup(val);
966 	if (sym->val == NULL) {
967 		free(sym->nam);
968 		free(sym);
969 		return (-1);
970 	}
971 	sym->used = 0;
972 	sym->persist = persist;
973 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
974 	return (0);
975 }
976 
977 int
978 cmdline_symset(char *s)
979 {
980 	char *sym, *val;
981 	int ret;
982 
983 	val = strrchr(s, '=');
984 	if (val == NULL)
985 		return (-1);
986 
987 	sym = strndup(s, val - s);
988 	if (sym == NULL)
989 		fatal("%s: strndup", __func__);
990 
991 	ret = symset(sym, val + 1, 1);
992 	free(sym);
993 
994 	return (ret);
995 }
996 
997 char *
998 symget(const char *nam)
999 {
1000 	struct sym *sym;
1001 
1002 	TAILQ_FOREACH(sym, &symhead, entry) {
1003 		if (strcmp(nam, sym->nam) == 0) {
1004 			sym->used = 1;
1005 			return (sym->val);
1006 		}
1007 	}
1008 	return (NULL);
1009 }
1010 
1011 int
1012 get_addrs(const char *hostname, const char *servname, struct server *new_srv)
1013 {
1014 	struct addrinfo hints, *res0, *res;
1015 	int error;
1016 	struct sockaddr_in *sin;
1017 	struct sockaddr_in6 *sin6;
1018 	struct address *h;
1019 
1020 	memset(&hints, 0, sizeof(hints));
1021 	hints.ai_family = AF_UNSPEC;
1022 	hints.ai_socktype = SOCK_STREAM;
1023 	hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
1024 	error = getaddrinfo(hostname, servname, &hints, &res0);
1025 	if (error) {
1026 		log_warnx("%s: could not parse \"%s:%s\": %s", __func__,
1027 		    hostname, servname, gai_strerror(error));
1028 		return (-1);
1029 	}
1030 
1031 	for (res = res0; res; res = res->ai_next) {
1032 		if ((h = calloc(1, sizeof(*h))) == NULL)
1033 			fatal(__func__);
1034 
1035 		if (hostname == NULL) {
1036 			strlcpy(h->ifname, "*", sizeof(h->ifname));
1037 		} else {
1038 			if (strlcpy(h->ifname, hostname, sizeof(h->ifname)) >=
1039 			    sizeof(h->ifname)) {
1040 				log_warnx("%s: address truncated: %s",
1041 				    __func__, hostname);
1042 				freeaddrinfo(res0);
1043 				free(h);
1044 				return (-1);
1045 			}
1046 		}
1047 
1048 		h->ai_family = res->ai_family;
1049 		h->ai_socktype = res->ai_socktype;
1050 		h->ai_protocol = res->ai_protocol;
1051 		memcpy(&h->ss, res->ai_addr, res->ai_addrlen);
1052 		h->slen = res->ai_addrlen;
1053 
1054 		switch (res->ai_family) {
1055 		case AF_INET:
1056 			sin = (struct sockaddr_in *)res->ai_addr;
1057 			h->port = ntohs(sin->sin_port);
1058 			break;
1059 		case AF_INET6:
1060 			sin6 = (struct sockaddr_in6 *)res->ai_addr;
1061 			h->port = ntohs(sin6->sin6_port);
1062 			break;
1063 		default:
1064 			fatalx("unknown address family %d", res->ai_family);
1065 		}
1066 
1067 		if (add_addr(new_srv, h))
1068 			return -1;
1069 	}
1070 	freeaddrinfo(res0);
1071 	return (0);
1072 }
1073 
1074 int
1075 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1076     const char *other_srv)
1077 {
1078 	struct address *a;
1079 	void *ia;
1080 	char buf[INET6_ADDRSTRLEN];
1081 	const char *addrstr;
1082 
1083 	TAILQ_FOREACH(a, al, entry) {
1084 		if (a->ai_family != h->ai_family ||
1085 		    a->ai_socktype != h->ai_socktype ||
1086 		    a->ai_protocol != h->ai_protocol ||
1087 		    a->slen != h->slen ||
1088 		    memcmp(&a->ss, &h->ss, a->slen) != 0)
1089 			continue;
1090 
1091 		switch (h->ss.ss_family) {
1092 		case AF_INET:
1093 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1094 			break;
1095 		case AF_INET6:
1096 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1097 			break;
1098 		default:
1099 			yyerror("unknown address family: %d", h->ss.ss_family);
1100 			return -1;
1101 		}
1102 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1103 		if (addrstr) {
1104 			if (other_srv) {
1105 				yyerror("server %s: duplicate fcgi listen "
1106 				    "address %s:%d, already used by server %s",
1107 				    new_srv, addrstr, h->port, other_srv);
1108 			} else {
1109 				log_warnx("server: %s: duplicate fcgi listen "
1110 				    "address %s:%d", new_srv, addrstr, h->port);
1111 			}
1112 		} else {
1113 			if (other_srv) {
1114 				yyerror("server: %s: duplicate fcgi listen "
1115 				    "address, already used by server %s",
1116 				    new_srv, other_srv);
1117 			} else {
1118 				log_warnx("server %s: duplicate fcgi listen "
1119 				    "address", new_srv);
1120 			}
1121 		}
1122 
1123 		return -1;
1124 	}
1125 
1126 	return 0;
1127 }
1128 
1129 int
1130 add_addr(struct server *new_srv, struct address *h)
1131 {
1132 	struct server *srv;
1133 
1134 	/* Address cannot be shared between different servers. */
1135 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1136 		if (srv == new_srv)
1137 			continue;
1138 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1139 			return -1;
1140 	}
1141 
1142 	/* Tolerate duplicate address lines within the scope of a server. */
1143 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1144 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1145 	else
1146 		free(h);
1147 
1148 	return 0;
1149 }