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 "proc.h"
51 #include "gotwebd.h"
52 #include "got_sockaddr.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 *, struct server *, in_port_t);
97 int		 addr_dup_check(struct addresslist *, struct address *,
98 		    const char *, const char *);
99 int		 add_addr(struct server *, struct address *);
100 struct address	*host_v4(const char *);
101 struct address	*host_v6(const char *);
102 int		 host_dns(const char *, struct server *,
103 		    int, in_port_t, const char *, int);
104 int		 host_if(const char *, struct server *,
105 		    int, in_port_t, const char *, int);
106 int		 host(const char *, struct server *,
107 		    int, in_port_t, const char *, int);
108 int		 is_if_in_group(const char *, const char *);
109 
110 typedef struct {
111 	union {
112 		long long	 number;
113 		char		*string;
114 		in_port_t	 port;
115 	} v;
116 	int lineno;
117 } YYSTYPE;
118 
119 %}
120 
121 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
122 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
123 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
124 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK RESPECT_EXPORTOK
125 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS SOCKET
126 
127 %token	<v.string>	STRING
128 %type	<v.port>	fcgiport
129 %token	<v.number>	NUMBER
130 %type	<v.number>	boolean
131 
132 %%
133 
134 grammar		: /* empty */
135 		| grammar '\n'
136 		| grammar varset '\n'
137 		| grammar main '\n'
138 		| grammar server '\n'
139 		| grammar error '\n'		{ file->errors++; }
140 		;
141 
142 varset		: STRING '=' STRING	{
143 			char *s = $1;
144 			while (*s++) {
145 				if (isspace((unsigned char)*s)) {
146 					yyerror("macro name cannot contain "
147 					    "whitespace");
148 					free($1);
149 					free($3);
150 					YYERROR;
151 				}
152 			}
153 			if (symset($1, $3, 0) == -1)
154 				fatal("cannot store variable");
155 			free($1);
156 			free($3);
157 		}
158 		;
159 
160 boolean		: STRING {
161 			if (strcasecmp($1, "1") == 0 ||
162 			    strcasecmp($1, "yes") == 0 ||
163 			    strcasecmp($1, "on") == 0)
164 				$$ = 1;
165 			else if (strcasecmp($1, "0") == 0 ||
166 			    strcasecmp($1, "off") == 0 ||
167 			    strcasecmp($1, "no") == 0)
168 				$$ = 0;
169 			else {
170 				yyerror("invalid boolean value '%s'", $1);
171 				free($1);
172 				YYERROR;
173 			}
174 			free($1);
175 		}
176 		| ON { $$ = 1; }
177 		| NUMBER { $$ = $1; }
178 		;
179 
180 fcgiport	: PORT NUMBER {
181 			if ($2 <= 0 || $2 > (int)USHRT_MAX) {
182 				yyerror("invalid port: %lld", $2);
183 				YYERROR;
184 			}
185 			$$ = $2;
186 		}
187 		| PORT STRING {
188 			int	 val;
189 
190 			if ((val = getservice($2)) == -1) {
191 				yyerror("invalid port: %s", $2);
192 				free($2);
193 				YYERROR;
194 			}
195 			free($2);
196 
197 			$$ = val;
198 		}
199 		;
200 
201 main		: PREFORK NUMBER {
202 			gotwebd->prefork_gotwebd = $2;
203 		}
204 		| CHROOT STRING {
205 			n = strlcpy(gotwebd->httpd_chroot, $2,
206 			    sizeof(gotwebd->httpd_chroot));
207 			if (n >= sizeof(gotwebd->httpd_chroot)) {
208 				yyerror("%s: httpd_chroot truncated", __func__);
209 				free($2);
210 				YYERROR;
211 			}
212 			free($2);
213 		}
214 		| UNIX_SOCKET boolean {
215 			gotwebd->unix_socket = $2;
216 		}
217 		| UNIX_SOCKET_NAME STRING {
218 			n = snprintf(gotwebd->unix_socket_name,
219 			    sizeof(gotwebd->unix_socket_name), "%s%s",
220 			    strlen(gotwebd->httpd_chroot) ?
221 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
222 			if (n < 0 ||
223 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
224 				yyerror("%s: unix_socket_name truncated",
225 				    __func__);
226 				free($2);
227 				YYERROR;
228 			}
229 			free($2);
230 		}
231 		;
232 
233 server		: SERVER STRING {
234 			struct server *srv;
235 
236 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
237 				if (strcmp(srv->name, $2) == 0) {
238 					yyerror("server name exists '%s'", $2);
239 					free($2);
240 					YYERROR;
241 				}
242 			}
243 
244 			new_srv = conf_new_server($2);
245 			log_debug("adding server %s", $2);
246 			free($2);
247 		}
248 		| SERVER STRING {
249 			struct server *srv;
250 
251 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
252 				if (strcmp(srv->name, $2) == 0) {
253 					yyerror("server name exists '%s'", $2);
254 					free($2);
255 					YYERROR;
256 				}
257 			}
258 
259 			new_srv = conf_new_server($2);
260 			log_debug("adding server %s", $2);
261 			free($2);
262 		} '{' optnl serveropts2 '}' {
263 		}
264 		;
265 
266 serveropts1	: REPOS_PATH STRING {
267 			n = strlcpy(new_srv->repos_path, $2,
268 			    sizeof(new_srv->repos_path));
269 			if (n >= sizeof(new_srv->repos_path)) {
270 				yyerror("%s: repos_path truncated", __func__);
271 				free($2);
272 				YYERROR;
273 			}
274 			free($2);
275 		}
276 		| SITE_NAME STRING {
277 			n = strlcpy(new_srv->site_name, $2,
278 			    sizeof(new_srv->site_name));
279 			if (n >= sizeof(new_srv->site_name)) {
280 				yyerror("%s: site_name truncated", __func__);
281 				free($2);
282 				YYERROR;
283 			}
284 			free($2);
285 		}
286 		| SITE_OWNER STRING {
287 			n = strlcpy(new_srv->site_owner, $2,
288 			    sizeof(new_srv->site_owner));
289 			if (n >= sizeof(new_srv->site_owner)) {
290 				yyerror("%s: site_owner truncated", __func__);
291 				free($2);
292 				YYERROR;
293 			}
294 			free($2);
295 		}
296 		| SITE_LINK STRING {
297 			n = strlcpy(new_srv->site_link, $2,
298 			    sizeof(new_srv->site_link));
299 			if (n >= sizeof(new_srv->site_link)) {
300 				yyerror("%s: site_link truncated", __func__);
301 				free($2);
302 				YYERROR;
303 			}
304 			free($2);
305 		}
306 		| LOGO STRING {
307 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
308 			if (n >= sizeof(new_srv->logo)) {
309 				yyerror("%s: logo truncated", __func__);
310 				free($2);
311 				YYERROR;
312 			}
313 			free($2);
314 		}
315 		| LOGO_URL STRING {
316 			n = strlcpy(new_srv->logo_url, $2,
317 			    sizeof(new_srv->logo_url));
318 			if (n >= sizeof(new_srv->logo_url)) {
319 				yyerror("%s: logo_url truncated", __func__);
320 				free($2);
321 				YYERROR;
322 			}
323 			free($2);
324 		}
325 		| CUSTOM_CSS STRING {
326 			n = strlcpy(new_srv->custom_css, $2,
327 			    sizeof(new_srv->custom_css));
328 			if (n >= sizeof(new_srv->custom_css)) {
329 				yyerror("%s: custom_css truncated", __func__);
330 				free($2);
331 				YYERROR;
332 			}
333 			free($2);
334 		}
335 		| LISTEN ON STRING fcgiport {
336 			if (get_addrs($3, new_srv, $4) == -1) {
337 				yyerror("could not get addrs");
338 				YYERROR;
339 			}
340 			new_srv->fcgi_socket = 1;
341 		}
342 		| LISTEN ON SOCKET STRING {
343 			if (!strcasecmp($4, "off") ||
344 			    !strcasecmp($4, "no")) {
345 				new_srv->unix_socket = 0;
346 				free($4);
347 				YYACCEPT;
348 			}
349 
350 			new_srv->unix_socket = 1;
351 
352 			n = snprintf(new_srv->unix_socket_name,
353 			    sizeof(new_srv->unix_socket_name), "%s%s",
354 			    strlen(gotwebd->httpd_chroot) ?
355 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $4);
356 			if (n < 0 ||
357 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
358 				yyerror("%s: unix_socket_name truncated",
359 				    __func__);
360 				free($4);
361 				YYERROR;
362 			}
363 			free($4);
364 		}
365 		| MAX_REPOS NUMBER {
366 			if ($2 > 0)
367 				new_srv->max_repos = $2;
368 		}
369 		| SHOW_SITE_OWNER boolean {
370 			new_srv->show_site_owner = $2;
371 		}
372 		| SHOW_REPO_OWNER boolean {
373 			new_srv->show_repo_owner = $2;
374 		}
375 		| SHOW_REPO_AGE boolean {
376 			new_srv->show_repo_age = $2;
377 		}
378 		| SHOW_REPO_DESCRIPTION boolean {
379 			new_srv->show_repo_description = $2;
380 		}
381 		| SHOW_REPO_CLONEURL boolean {
382 			new_srv->show_repo_cloneurl = $2;
383 		}
384 		| RESPECT_EXPORTOK boolean {
385 			new_srv->respect_exportok = $2;
386 		}
387 		| MAX_REPOS_DISPLAY NUMBER {
388 				new_srv->max_repos_display = $2;
389 		}
390 		| MAX_COMMITS_DISPLAY NUMBER {
391 			if ($2 > 0)
392 				new_srv->max_commits_display = $2;
393 		}
394 		;
395 
396 serveropts2	: serveropts2 serveropts1 nl
397 		| serveropts1 optnl
398 		;
399 
400 nl		: '\n' optnl
401 		;
402 
403 optnl		: '\n' optnl		/* zero or more newlines */
404 		| /* empty */
405 		;
406 
407 %%
408 
409 struct keywords {
410 	const char	*k_name;
411 	int		 k_val;
412 };
413 
414 int
415 yyerror(const char *fmt, ...)
416 {
417 	va_list ap;
418 	char *msg;
419 
420 	file->errors++;
421 	va_start(ap, fmt);
422 	if (vasprintf(&msg, fmt, ap) == -1)
423 		fatalx("yyerror vasprintf");
424 	va_end(ap);
425 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
426 	free(msg);
427 	return (0);
428 }
429 
430 int
431 kw_cmp(const void *k, const void *e)
432 {
433 	return (strcmp(k, ((const struct keywords *)e)->k_name));
434 }
435 
436 int
437 lookup(char *s)
438 {
439 	/* This has to be sorted always. */
440 	static const struct keywords keywords[] = {
441 		{ "chroot",			CHROOT },
442 		{ "custom_css",			CUSTOM_CSS },
443 		{ "listen",			LISTEN },
444 		{ "logo",			LOGO },
445 		{ "logo_url",			LOGO_URL },
446 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
447 		{ "max_repos",			MAX_REPOS },
448 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
449 		{ "on",				ON },
450 		{ "port",			PORT },
451 		{ "prefork",			PREFORK },
452 		{ "repos_path",			REPOS_PATH },
453 		{ "respect_exportok",		RESPECT_EXPORTOK },
454 		{ "server",			SERVER },
455 		{ "show_repo_age",		SHOW_REPO_AGE },
456 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
457 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
458 		{ "show_repo_owner",		SHOW_REPO_OWNER },
459 		{ "show_site_owner",		SHOW_SITE_OWNER },
460 		{ "site_link",			SITE_LINK },
461 		{ "site_name",			SITE_NAME },
462 		{ "site_owner",			SITE_OWNER },
463 		{ "socket",			SOCKET },
464 		{ "unix_socket",		UNIX_SOCKET },
465 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
466 	};
467 	const struct keywords *p;
468 
469 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
470 	    sizeof(keywords[0]), kw_cmp);
471 
472 	if (p)
473 		return (p->k_val);
474 	else
475 		return (STRING);
476 }
477 
478 #define MAXPUSHBACK	128
479 
480 unsigned char *parsebuf;
481 int parseindex;
482 unsigned char pushback_buffer[MAXPUSHBACK];
483 int pushback_index = 0;
484 
485 int
486 lgetc(int quotec)
487 {
488 	int c, next;
489 
490 	if (parsebuf) {
491 		/* Read character from the parsebuffer instead of input. */
492 		if (parseindex >= 0) {
493 			c = parsebuf[parseindex++];
494 			if (c != '\0')
495 				return (c);
496 			parsebuf = NULL;
497 		} else
498 			parseindex++;
499 	}
500 
501 	if (pushback_index)
502 		return (pushback_buffer[--pushback_index]);
503 
504 	if (quotec) {
505 		c = getc(file->stream);
506 		if (c == EOF)
507 			yyerror("reached end of file while parsing "
508 			    "quoted string");
509 		return (c);
510 	}
511 
512 	c = getc(file->stream);
513 	while (c == '\\') {
514 		next = getc(file->stream);
515 		if (next != '\n') {
516 			c = next;
517 			break;
518 		}
519 		yylval.lineno = file->lineno;
520 		file->lineno++;
521 		c = getc(file->stream);
522 	}
523 
524 	return (c);
525 }
526 
527 int
528 lungetc(int c)
529 {
530 	if (c == EOF)
531 		return (EOF);
532 	if (parsebuf) {
533 		parseindex--;
534 		if (parseindex >= 0)
535 			return (c);
536 	}
537 	if (pushback_index < MAXPUSHBACK-1)
538 		return (pushback_buffer[pushback_index++] = c);
539 	else
540 		return (EOF);
541 }
542 
543 int
544 findeol(void)
545 {
546 	int c;
547 
548 	parsebuf = NULL;
549 
550 	/* Skip to either EOF or the first real EOL. */
551 	while (1) {
552 		if (pushback_index)
553 			c = pushback_buffer[--pushback_index];
554 		else
555 			c = lgetc(0);
556 		if (c == '\n') {
557 			file->lineno++;
558 			break;
559 		}
560 		if (c == EOF)
561 			break;
562 	}
563 	return (ERROR);
564 }
565 
566 int
567 yylex(void)
568 {
569 	unsigned char buf[8096];
570 	unsigned char *p, *val;
571 	int quotec, next, c;
572 	int token;
573 
574 top:
575 	p = buf;
576 	c = lgetc(0);
577 	while (c == ' ' || c == '\t')
578 		c = lgetc(0); /* nothing */
579 
580 	yylval.lineno = file->lineno;
581 	if (c == '#') {
582 		c = lgetc(0);
583 		while (c != '\n' && c != EOF)
584 			c = lgetc(0); /* nothing */
585 	}
586 	if (c == '$' && parsebuf == NULL) {
587 		while (1) {
588 			c = lgetc(0);
589 			if (c == EOF)
590 				return (0);
591 
592 			if (p + 1 >= buf + sizeof(buf) - 1) {
593 				yyerror("string too long");
594 				return (findeol());
595 			}
596 			if (isalnum(c) || c == '_') {
597 				*p++ = c;
598 				continue;
599 			}
600 			*p = '\0';
601 			lungetc(c);
602 			break;
603 		}
604 		val = symget(buf);
605 		if (val == NULL) {
606 			yyerror("macro '%s' not defined", buf);
607 			return (findeol());
608 		}
609 		parsebuf = val;
610 		parseindex = 0;
611 		goto top;
612 	}
613 
614 	switch (c) {
615 	case '\'':
616 	case '"':
617 		quotec = c;
618 		while (1) {
619 			c = lgetc(quotec);
620 			if (c == EOF)
621 				return (0);
622 			if (c == '\n') {
623 				file->lineno++;
624 				continue;
625 			} else if (c == '\\') {
626 				next = lgetc(quotec);
627 				if (next == EOF)
628 					return (0);
629 				if (next == quotec || c == ' ' || c == '\t')
630 					c = next;
631 				else if (next == '\n') {
632 					file->lineno++;
633 					continue;
634 				} else
635 					lungetc(next);
636 			} else if (c == quotec) {
637 				*p = '\0';
638 				break;
639 			} else if (c == '\0') {
640 				yyerror("syntax error");
641 				return (findeol());
642 			}
643 			if (p + 1 >= buf + sizeof(buf) - 1) {
644 				yyerror("string too long");
645 				return (findeol());
646 			}
647 			*p++ = c;
648 		}
649 		yylval.v.string = strdup(buf);
650 		if (yylval.v.string == NULL)
651 			err(1, "yylex: strdup");
652 		return (STRING);
653 	}
654 
655 #define allowed_to_end_number(x) \
656 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
657 
658 	if (c == '-' || isdigit(c)) {
659 		do {
660 			*p++ = c;
661 			if ((unsigned)(p-buf) >= sizeof(buf)) {
662 				yyerror("string too long");
663 				return (findeol());
664 			}
665 			c = lgetc(0);
666 		} while (c != EOF && isdigit(c));
667 		lungetc(c);
668 		if (p == buf + 1 && buf[0] == '-')
669 			goto nodigits;
670 		if (c == EOF || allowed_to_end_number(c)) {
671 			const char *errstr = NULL;
672 
673 			*p = '\0';
674 			yylval.v.number = strtonum(buf, LLONG_MIN,
675 			    LLONG_MAX, &errstr);
676 			if (errstr) {
677 				yyerror("\"%s\" invalid number: %s",
678 				    buf, errstr);
679 				return (findeol());
680 			}
681 			return (NUMBER);
682 		} else {
683 nodigits:
684 			while (p > buf + 1)
685 				lungetc(*--p);
686 			c = *--p;
687 			if (c == '-')
688 				return (c);
689 		}
690 	}
691 
692 #define allowed_in_string(x) \
693 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
694 	x != '{' && x != '}' && \
695 	x != '!' && x != '=' && x != '#' && \
696 	x != ','))
697 
698 	if (isalnum(c) || c == ':' || c == '_') {
699 		do {
700 			*p++ = c;
701 			if ((unsigned)(p-buf) >= sizeof(buf)) {
702 				yyerror("string too long");
703 				return (findeol());
704 			}
705 			c = lgetc(0);
706 		} while (c != EOF && (allowed_in_string(c)));
707 		lungetc(c);
708 		*p = '\0';
709 		token = lookup(buf);
710 		if (token == STRING) {
711 			yylval.v.string = strdup(buf);
712 			if (yylval.v.string == NULL)
713 				err(1, "yylex: strdup");
714 		}
715 		return (token);
716 	}
717 	if (c == '\n') {
718 		yylval.lineno = file->lineno;
719 		file->lineno++;
720 	}
721 	if (c == EOF)
722 		return (0);
723 	return (c);
724 }
725 
726 int
727 check_file_secrecy(int fd, const char *fname)
728 {
729 	struct stat st;
730 
731 	if (fstat(fd, &st)) {
732 		log_warn("cannot stat %s", fname);
733 		return (-1);
734 	}
735 	if (st.st_uid != 0 && st.st_uid != getuid()) {
736 		log_warnx("%s: owner not root or current user", fname);
737 		return (-1);
738 	}
739 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
740 		log_warnx("%s: group writable or world read/writable", fname);
741 		return (-1);
742 	}
743 	return (0);
744 }
745 
746 struct file *
747 newfile(const char *name, int secret)
748 {
749 	struct file *nfile;
750 
751 	nfile = calloc(1, sizeof(struct file));
752 	if (nfile == NULL) {
753 		log_warn("calloc");
754 		return (NULL);
755 	}
756 	nfile->name = strdup(name);
757 	if (nfile->name == NULL) {
758 		log_warn("strdup");
759 		free(nfile);
760 		return (NULL);
761 	}
762 	nfile->stream = fopen(nfile->name, "r");
763 	if (nfile->stream == NULL) {
764 		/* no warning, we don't require a conf file */
765 		free(nfile->name);
766 		free(nfile);
767 		return (NULL);
768 	} else if (secret &&
769 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
770 		fclose(nfile->stream);
771 		free(nfile->name);
772 		free(nfile);
773 		return (NULL);
774 	}
775 	nfile->lineno = 1;
776 	return (nfile);
777 }
778 
779 static void
780 closefile(struct file *xfile)
781 {
782 	fclose(xfile->stream);
783 	free(xfile->name);
784 	free(xfile);
785 }
786 
787 static void
788 add_default_server(void)
789 {
790 	new_srv = conf_new_server(D_SITENAME);
791 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
792 }
793 
794 int
795 parse_config(const char *filename, struct gotwebd *env)
796 {
797 	struct sym *sym, *next;
798 
799 	if (config_init(env) == -1)
800 		fatalx("failed to initialize configuration");
801 
802 	gotwebd = env;
803 
804 	file = newfile(filename, 0);
805 	if (file == NULL) {
806 		add_default_server();
807 		sockets_parse_sockets(env);
808 		/* just return, as we don't require a conf file */
809 		return (0);
810 	}
811 
812 	yyparse();
813 	errors = file->errors;
814 	closefile(file);
815 
816 	/* Free macros and check which have not been used. */
817 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
818 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
819 			fprintf(stderr, "warning: macro '%s' not used\n",
820 			    sym->nam);
821 		if (!sym->persist) {
822 			free(sym->nam);
823 			free(sym->val);
824 			TAILQ_REMOVE(&symhead, sym, entry);
825 			free(sym);
826 		}
827 	}
828 
829 	if (errors)
830 		return (-1);
831 
832 	/* just add default server if no config specified */
833 	if (gotwebd->server_cnt == 0)
834 		add_default_server();
835 
836 	/* setup our listening sockets */
837 	sockets_parse_sockets(env);
838 
839 	return (0);
840 }
841 
842 struct server *
843 conf_new_server(const char *name)
844 {
845 	struct server *srv = NULL;
846 
847 	srv = calloc(1, sizeof(*srv));
848 	if (srv == NULL)
849 		fatalx("%s: calloc", __func__);
850 
851 	n = strlcpy(srv->name, name, sizeof(srv->name));
852 	if (n >= sizeof(srv->name))
853 		fatalx("%s: strlcpy", __func__);
854 	n = snprintf(srv->unix_socket_name,
855 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
856 	    D_UNIX_SOCKET);
857 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
858 		fatalx("%s: snprintf", __func__);
859 	n = strlcpy(srv->repos_path, D_GOTPATH,
860 	    sizeof(srv->repos_path));
861 	if (n >= sizeof(srv->repos_path))
862 		fatalx("%s: strlcpy", __func__);
863 	n = strlcpy(srv->site_name, D_SITENAME,
864 	    sizeof(srv->site_name));
865 	if (n >= sizeof(srv->site_name))
866 		fatalx("%s: strlcpy", __func__);
867 	n = strlcpy(srv->site_owner, D_SITEOWNER,
868 	    sizeof(srv->site_owner));
869 	if (n >= sizeof(srv->site_owner))
870 		fatalx("%s: strlcpy", __func__);
871 	n = strlcpy(srv->site_link, D_SITELINK,
872 	    sizeof(srv->site_link));
873 	if (n >= sizeof(srv->site_link))
874 		fatalx("%s: strlcpy", __func__);
875 	n = strlcpy(srv->logo, D_GOTLOGO,
876 	    sizeof(srv->logo));
877 	if (n >= sizeof(srv->logo))
878 		fatalx("%s: strlcpy", __func__);
879 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
880 	if (n >= sizeof(srv->logo_url))
881 		fatalx("%s: strlcpy", __func__);
882 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
883 	if (n >= sizeof(srv->custom_css))
884 		fatalx("%s: strlcpy", __func__);
885 
886 	srv->show_site_owner = D_SHOWSOWNER;
887 	srv->show_repo_owner = D_SHOWROWNER;
888 	srv->show_repo_age = D_SHOWAGE;
889 	srv->show_repo_description = D_SHOWDESC;
890 	srv->show_repo_cloneurl = D_SHOWURL;
891 	srv->respect_exportok = D_RESPECTEXPORTOK;
892 
893 	srv->max_repos_display = D_MAXREPODISP;
894 	srv->max_commits_display = D_MAXCOMMITDISP;
895 	srv->max_repos = D_MAXREPO;
896 
897 	srv->unix_socket = 1;
898 	srv->fcgi_socket = 0;
899 
900 	TAILQ_INIT(&srv->al);
901 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
902 	gotwebd->server_cnt++;
903 
904 	return srv;
905 };
906 
907 int
908 symset(const char *nam, const char *val, int persist)
909 {
910 	struct sym *sym;
911 
912 	TAILQ_FOREACH(sym, &symhead, entry) {
913 		if (strcmp(nam, sym->nam) == 0)
914 			break;
915 	}
916 
917 	if (sym != NULL) {
918 		if (sym->persist == 1)
919 			return (0);
920 		else {
921 			free(sym->nam);
922 			free(sym->val);
923 			TAILQ_REMOVE(&symhead, sym, entry);
924 			free(sym);
925 		}
926 	}
927 	sym = calloc(1, sizeof(*sym));
928 	if (sym == NULL)
929 		return (-1);
930 
931 	sym->nam = strdup(nam);
932 	if (sym->nam == NULL) {
933 		free(sym);
934 		return (-1);
935 	}
936 	sym->val = strdup(val);
937 	if (sym->val == NULL) {
938 		free(sym->nam);
939 		free(sym);
940 		return (-1);
941 	}
942 	sym->used = 0;
943 	sym->persist = persist;
944 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
945 	return (0);
946 }
947 
948 int
949 cmdline_symset(char *s)
950 {
951 	char *sym, *val;
952 	int ret;
953 
954 	val = strrchr(s, '=');
955 	if (val == NULL)
956 		return (-1);
957 
958 	sym = strndup(s, val - s);
959 	if (sym == NULL)
960 		fatal("%s: strndup", __func__);
961 
962 	ret = symset(sym, val + 1, 1);
963 	free(sym);
964 
965 	return (ret);
966 }
967 
968 char *
969 symget(const char *nam)
970 {
971 	struct sym *sym;
972 
973 	TAILQ_FOREACH(sym, &symhead, entry) {
974 		if (strcmp(nam, sym->nam) == 0) {
975 			sym->used = 1;
976 			return (sym->val);
977 		}
978 	}
979 	return (NULL);
980 }
981 
982 int
983 getservice(const char *n)
984 {
985 	struct servent *s;
986 	const char *errstr;
987 	long long llval;
988 
989 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
990 	if (errstr) {
991 		s = getservbyname(n, "tcp");
992 		if (s == NULL)
993 			s = getservbyname(n, "udp");
994 		if (s == NULL)
995 			return (-1);
996 		return ntohs(s->s_port);
997 	}
998 
999 	return (unsigned short)llval;
1000 }
1001 
1002 struct address *
1003 host_v4(const char *s)
1004 {
1005 	struct in_addr ina;
1006 	struct sockaddr_in *sain;
1007 	struct address *h;
1008 
1009 	memset(&ina, 0, sizeof(ina));
1010 	if (inet_pton(AF_INET, s, &ina) != 1)
1011 		return (NULL);
1012 
1013 	if ((h = calloc(1, sizeof(*h))) == NULL)
1014 		fatal(__func__);
1015 	sain = (struct sockaddr_in *)&h->ss;
1016 	got_sockaddr_inet_init(sain, &ina);
1017 	if (sain->sin_addr.s_addr == INADDR_ANY)
1018 		h->prefixlen = 0; /* 0.0.0.0 address */
1019 	else
1020 		h->prefixlen = -1; /* host address */
1021 	return (h);
1022 }
1023 
1024 struct address *
1025 host_v6(const char *s)
1026 {
1027 	struct addrinfo hints, *res;
1028 	struct sockaddr_in6 *sa_in6, *ra;
1029 	struct address *h = NULL;
1030 
1031 	memset(&hints, 0, sizeof(hints));
1032 	hints.ai_family = AF_INET6;
1033 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1034 	hints.ai_flags = AI_NUMERICHOST;
1035 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1036 		if ((h = calloc(1, sizeof(*h))) == NULL)
1037 			fatal(__func__);
1038 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1039 		ra = (struct sockaddr_in6 *)res->ai_addr;
1040 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1041 		    ra->sin6_scope_id);
1042 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1043 		    sizeof(sa_in6->sin6_addr)) == 0)
1044 			h->prefixlen = 0; /* any address */
1045 		else
1046 			h->prefixlen = -1; /* host address */
1047 		freeaddrinfo(res);
1048 	}
1049 
1050 	return (h);
1051 }
1052 
1053 int
1054 host_dns(const char *s, struct server *new_srv, int max,
1055     in_port_t port, const char *ifname, int ipproto)
1056 {
1057 	struct addrinfo hints, *res0, *res;
1058 	int error, cnt = 0;
1059 	struct sockaddr_in *sain;
1060 	struct sockaddr_in6 *sin6;
1061 	struct address *h;
1062 
1063 	if ((cnt = host_if(s, new_srv, max, port, ifname, ipproto)) != 0)
1064 		return (cnt);
1065 
1066 	memset(&hints, 0, sizeof(hints));
1067 	hints.ai_family = PF_UNSPEC;
1068 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1069 	hints.ai_flags = AI_ADDRCONFIG;
1070 	error = getaddrinfo(s, NULL, &hints, &res0);
1071 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1072 		return (0);
1073 	if (error) {
1074 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1075 		    gai_strerror(error));
1076 		return (-1);
1077 	}
1078 
1079 	for (res = res0; res && cnt < max; res = res->ai_next) {
1080 		if (res->ai_family != AF_INET &&
1081 		    res->ai_family != AF_INET6)
1082 			continue;
1083 		if ((h = calloc(1, sizeof(*h))) == NULL)
1084 			fatal(__func__);
1085 
1086 		if (port)
1087 			h->port = port;
1088 		if (ifname != NULL) {
1089 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1090 			    sizeof(h->ifname)) {
1091 				log_warnx("%s: interface name truncated",
1092 				    __func__);
1093 				freeaddrinfo(res0);
1094 				free(h);
1095 				return (-1);
1096 			}
1097 		}
1098 		if (ipproto != -1)
1099 			h->ipproto = ipproto;
1100 		h->ss.ss_family = res->ai_family;
1101 		h->prefixlen = -1; /* host address */
1102 
1103 		if (res->ai_family == AF_INET) {
1104 			struct sockaddr_in *ra;
1105 			sain = (struct sockaddr_in *)&h->ss;
1106 			ra = (struct sockaddr_in *)res->ai_addr;
1107 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1108 		} else {
1109 			struct sockaddr_in6 *ra;
1110 			sin6 = (struct sockaddr_in6 *)&h->ss;
1111 			ra = (struct sockaddr_in6 *)res->ai_addr;
1112 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1113 		}
1114 
1115 		if (add_addr(new_srv, h))
1116 			return -1;
1117 		cnt++;
1118 	}
1119 	if (cnt == max && res) {
1120 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1121 		    s, max);
1122 	}
1123 	freeaddrinfo(res0);
1124 	return (cnt);
1125 }
1126 
1127 int
1128 host_if(const char *s, struct server *new_srv, int max,
1129     in_port_t port, const char *ifname, int ipproto)
1130 {
1131 	struct ifaddrs *ifap, *p;
1132 	struct sockaddr_in *sain;
1133 	struct sockaddr_in6 *sin6;
1134 	struct address *h;
1135 	int cnt = 0, af;
1136 
1137 	if (getifaddrs(&ifap) == -1)
1138 		fatal("getifaddrs");
1139 
1140 	/* First search for IPv4 addresses */
1141 	af = AF_INET;
1142 
1143  nextaf:
1144 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1145 		if (p->ifa_addr == NULL ||
1146 		    p->ifa_addr->sa_family != af ||
1147 		    (strcmp(s, p->ifa_name) != 0 &&
1148 		    !is_if_in_group(p->ifa_name, s)))
1149 			continue;
1150 		if ((h = calloc(1, sizeof(*h))) == NULL)
1151 			fatal("calloc");
1152 
1153 		if (port)
1154 			h->port = port;
1155 		if (ifname != NULL) {
1156 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1157 			    sizeof(h->ifname)) {
1158 				log_warnx("%s: interface name truncated",
1159 				    __func__);
1160 				free(h);
1161 				freeifaddrs(ifap);
1162 				return (-1);
1163 			}
1164 		}
1165 		if (ipproto != -1)
1166 			h->ipproto = ipproto;
1167 		h->ss.ss_family = af;
1168 		h->prefixlen = -1; /* host address */
1169 
1170 		if (af == AF_INET) {
1171 			struct sockaddr_in *ra;
1172 			sain = (struct sockaddr_in *)&h->ss;
1173 			ra = (struct sockaddr_in *)p->ifa_addr;
1174 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1175 		} else {
1176 			struct sockaddr_in6 *ra;
1177 			sin6 = (struct sockaddr_in6 *)&h->ss;
1178 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1179 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1180 			    ra->sin6_scope_id);
1181 		}
1182 
1183 		if (add_addr(new_srv, h))
1184 			return -1;
1185 		cnt++;
1186 	}
1187 	if (af == AF_INET) {
1188 		/* Next search for IPv6 addresses */
1189 		af = AF_INET6;
1190 		goto nextaf;
1191 	}
1192 
1193 	if (cnt > max) {
1194 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1195 		    s, max);
1196 	}
1197 	freeifaddrs(ifap);
1198 	return (cnt);
1199 }
1200 
1201 int
1202 host(const char *s, struct server *new_srv, int max,
1203     in_port_t port, const char *ifname, int ipproto)
1204 {
1205 	struct address *h;
1206 
1207 	h = host_v4(s);
1208 
1209 	/* IPv6 address? */
1210 	if (h == NULL)
1211 		h = host_v6(s);
1212 
1213 	if (h != NULL) {
1214 		if (port)
1215 			h->port = port;
1216 		if (ifname != NULL) {
1217 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1218 			    sizeof(h->ifname)) {
1219 				log_warnx("%s: interface name truncated",
1220 				    __func__);
1221 				free(h);
1222 				return (-1);
1223 			}
1224 		}
1225 		if (ipproto != -1)
1226 			h->ipproto = ipproto;
1227 
1228 		if (add_addr(new_srv, h))
1229 			return -1;
1230 		return (1);
1231 	}
1232 
1233 	return (host_dns(s, new_srv, max, port, ifname, ipproto));
1234 }
1235 
1236 int
1237 is_if_in_group(const char *ifname, const char *groupname)
1238 {
1239 	unsigned int len;
1240 	struct ifgroupreq ifgr;
1241 	struct ifg_req *ifg;
1242 	int s;
1243 	int ret = 0;
1244 
1245 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1246 		err(1, "socket");
1247 
1248 	memset(&ifgr, 0, sizeof(ifgr));
1249 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1250 		err(1, "IFNAMSIZ");
1251 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1252 		if (errno == EINVAL || errno == ENOTTY)
1253 			goto end;
1254 		err(1, "SIOCGIFGROUP");
1255 	}
1256 
1257 	len = ifgr.ifgr_len;
1258 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1259 	    sizeof(struct ifg_req));
1260 	if (ifgr.ifgr_groups == NULL)
1261 		err(1, "getifgroups");
1262 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1263 		err(1, "SIOCGIFGROUP");
1264 
1265 	ifg = ifgr.ifgr_groups;
1266 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1267 		len -= sizeof(struct ifg_req);
1268 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1269 			ret = 1;
1270 			break;
1271 		}
1272 	}
1273 	free(ifgr.ifgr_groups);
1274 
1275 end:
1276 	close(s);
1277 	return (ret);
1278 }
1279 
1280 int
1281 get_addrs(const char *addr, struct server *new_srv, in_port_t port)
1282 {
1283 	if (strcmp("", addr) == 0) {
1284 		if (host("127.0.0.1", new_srv, 1, port, "127.0.0.1",
1285 		    -1) <= 0) {
1286 			yyerror("invalid listen ip: %s",
1287 			    "127.0.0.1");
1288 			return (-1);
1289 		}
1290 		if (host("::1", new_srv, 1, port, "::1", -1) <= 0) {
1291 			yyerror("invalid listen ip: %s", "::1");
1292 			return (-1);
1293 		}
1294 	} else {
1295 		if (host(addr, new_srv, GOTWEBD_MAXIFACE, port, addr,
1296 		    -1) <= 0) {
1297 			yyerror("invalid listen ip: %s", addr);
1298 			return (-1);
1299 		}
1300 	}
1301 	return (0);
1302 }
1303 
1304 int
1305 addr_dup_check(struct addresslist *al, struct address *h, const char *new_srv,
1306     const char *other_srv)
1307 {
1308 	struct address *a;
1309 	void *ia;
1310 	char buf[INET6_ADDRSTRLEN];
1311 	const char *addrstr;
1312 
1313 	TAILQ_FOREACH(a, al, entry) {
1314 		if (memcmp(&a->ss, &h->ss, sizeof(h->ss)) != 0 ||
1315 		    a->port != h->port)
1316 			continue;
1317 
1318 		switch (h->ss.ss_family) {
1319 		case AF_INET:
1320 			ia = &((struct sockaddr_in *)(&h->ss))->sin_addr;
1321 			break;
1322 		case AF_INET6:
1323 			ia = &((struct sockaddr_in6 *)(&h->ss))->sin6_addr;
1324 			break;
1325 		default:
1326 			yyerror("unknown address family: %d", h->ss.ss_family);
1327 			return -1;
1328 		}
1329 		addrstr = inet_ntop(h->ss.ss_family, ia, buf, sizeof(buf));
1330 		if (addrstr) {
1331 			if (other_srv) {
1332 				yyerror("server %s: duplicate fcgi listen "
1333 				    "address %s:%d, already used by server %s",
1334 				    new_srv, addrstr, h->port, other_srv);
1335 			} else {
1336 				log_warnx("server: %s: duplicate fcgi listen "
1337 				    "address %s:%d", new_srv, addrstr, h->port);
1338 			}
1339 		} else {
1340 			if (other_srv) {
1341 				yyerror("server: %s: duplicate fcgi listen "
1342 				    "address, already used by server %s",
1343 				    new_srv, other_srv);
1344 			} else {
1345 				log_warnx("server %s: duplicate fcgi listen "
1346 				    "address", new_srv);
1347 			}
1348 		}
1349 
1350 		return -1;
1351 	}
1352 
1353 	return 0;
1354 }
1355 
1356 int
1357 add_addr(struct server *new_srv, struct address *h)
1358 {
1359 	struct server *srv;
1360 
1361 	/* Address cannot be shared between different servers. */
1362 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1363 		if (srv == new_srv)
1364 			continue;
1365 		if (addr_dup_check(&srv->al, h, new_srv->name, srv->name))
1366 			return -1;
1367 	}
1368 
1369 	/* Tolerate duplicate address lines within the scope of a server. */
1370 	if (addr_dup_check(&new_srv->al, h, NULL, NULL) == 0)
1371 		TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1372 	else
1373 		free(h);
1374 
1375 	return 0;
1376 }