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 addresslist *, in_port_t);
97 struct address	*host_v4(const char *);
98 struct address	*host_v6(const char *);
99 int		 host_dns(const char *, struct addresslist *,
100 		    int, in_port_t, const char *, int);
101 int		 host_if(const char *, struct addresslist *,
102 		    int, in_port_t, const char *, int);
103 int		 host(const char *, struct addresslist *,
104 		    int, in_port_t, const char *, int);
105 int		 is_if_in_group(const char *, const char *);
106 
107 typedef struct {
108 	union {
109 		long long	 number;
110 		char		*string;
111 		in_port_t	 port;
112 	} v;
113 	int lineno;
114 } YYSTYPE;
115 
116 %}
117 
118 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
119 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
120 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
121 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK FCGI_SOCKET
122 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS
123 
124 %token	<v.string>	STRING
125 %type	<v.port>	fcgiport
126 %token	<v.number>	NUMBER
127 %type	<v.number>	boolean
128 
129 %%
130 
131 grammar		:
132 		| grammar '\n'
133 		| grammar main '\n'
134 		| grammar server '\n'
135 		;
136 
137 boolean		: STRING {
138 			if (strcasecmp($1, "1") == 0 ||
139 			    strcasecmp($1, "yes") == 0 ||
140 			    strcasecmp($1, "on") == 0)
141 				$$ = 1;
142 			else if (strcasecmp($1, "0") == 0 ||
143 			    strcasecmp($1, "off") == 0 ||
144 			    strcasecmp($1, "no") == 0)
145 				$$ = 0;
146 			else {
147 				yyerror("invalid boolean value '%s'", $1);
148 				free($1);
149 				YYERROR;
150 			}
151 			free($1);
152 		}
153 		| ON { $$ = 1; }
154 		| NUMBER { $$ = $1; }
155 		;
156 
157 fcgiport	: NUMBER {
158 			if ($1 <= 0 || $1 > (int)USHRT_MAX) {
159 				yyerror("invalid port: %lld", $1);
160 				YYERROR;
161 			}
162 			$$ = htons($1);
163 		}
164 		| STRING {
165 			int	 val;
166 
167 			if ((val = getservice($1)) == -1) {
168 				yyerror("invalid port: %s", $1);
169 				free($1);
170 				YYERROR;
171 			}
172 			free($1);
173 
174 			$$ = val;
175 		}
176 		;
177 
178 main		: PREFORK NUMBER {
179 			gotwebd->prefork_gotwebd = $2;
180 		}
181 		| CHROOT STRING {
182 			n = strlcpy(gotwebd->httpd_chroot, $2,
183 			    sizeof(gotwebd->httpd_chroot));
184 			if (n >= sizeof(gotwebd->httpd_chroot)) {
185 				yyerror("%s: httpd_chroot truncated", __func__);
186 				free($2);
187 				YYERROR;
188 			}
189 			free($2);
190 		}
191 		| FCGI_SOCKET boolean {
192 			gotwebd->fcgi_socket = $2;
193 		}
194 		| FCGI_SOCKET boolean  {
195 			gotwebd->fcgi_socket = $2;
196 		} '{' optnl socketopts4 '}'
197 		| UNIX_SOCKET boolean {
198 			gotwebd->unix_socket = $2;
199 		}
200 		| UNIX_SOCKET_NAME STRING {
201 			n = snprintf(gotwebd->unix_socket_name,
202 			    sizeof(gotwebd->unix_socket_name), "%s%s",
203 			    strlen(gotwebd->httpd_chroot) ?
204 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
205 			if (n < 0) {
206 				yyerror("%s: unix_socket_name truncated",
207 				    __func__);
208 				free($2);
209 				YYERROR;
210 			}
211 			free($2);
212 		}
213 		;
214 
215 server		: SERVER STRING {
216 			struct server *srv;
217 
218 			TAILQ_FOREACH(srv, gotwebd->servers, entry) {
219 				if (strcmp(srv->name, $2) == 0) {
220 					yyerror("server name exists '%s'", $2);
221 					free($2);
222 					YYERROR;
223 				}
224 			}
225 
226 			new_srv = conf_new_server($2);
227 			if (new_srv->fcgi_socket)
228 				if (get_addrs(new_srv->fcgi_socket_bind,
229 				    new_srv->al,
230 				    new_srv->fcgi_socket_port) == -1) {
231 					yyerror("could not get tcp iface "
232 					    "addrs");
233 					YYERROR;
234 				}
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 			if (get_addrs(new_srv->fcgi_socket_bind,
254 			    new_srv->al, new_srv->fcgi_socket_port) == -1) {
255 				yyerror("could not get tcp iface addrs");
256 				YYERROR;
257 			}
258 		}
259 		;
260 
261 serveropts1	: REPOS_PATH STRING {
262 			n = strlcpy(new_srv->repos_path, $2,
263 			    sizeof(new_srv->repos_path));
264 			if (n >= sizeof(new_srv->repos_path)) {
265 				yyerror("%s: repos_path truncated", __func__);
266 				free($2);
267 				YYERROR;
268 			}
269 			free($2);
270 		}
271 		| SITE_NAME STRING {
272 			n = strlcpy(new_srv->site_name, $2,
273 			    sizeof(new_srv->site_name));
274 			if (n >= sizeof(new_srv->site_name)) {
275 				yyerror("%s: site_name truncated", __func__);
276 				free($2);
277 				YYERROR;
278 			}
279 			free($2);
280 		}
281 		| SITE_OWNER STRING {
282 			n = strlcpy(new_srv->site_owner, $2,
283 			    sizeof(new_srv->site_owner));
284 			if (n >= sizeof(new_srv->site_owner)) {
285 				yyerror("%s: site_owner truncated", __func__);
286 				free($2);
287 				YYERROR;
288 			}
289 			free($2);
290 		}
291 		| SITE_LINK STRING {
292 			n = strlcpy(new_srv->site_link, $2,
293 			    sizeof(new_srv->site_link));
294 			if (n >= sizeof(new_srv->site_link)) {
295 				yyerror("%s: site_link truncated", __func__);
296 				free($2);
297 				YYERROR;
298 			}
299 			free($2);
300 		}
301 		| LOGO STRING {
302 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
303 			if (n >= sizeof(new_srv->logo)) {
304 				yyerror("%s: logo truncated", __func__);
305 				free($2);
306 				YYERROR;
307 			}
308 			free($2);
309 		}
310 		| LOGO_URL STRING {
311 			n = strlcpy(new_srv->logo_url, $2,
312 			    sizeof(new_srv->logo_url));
313 			if (n >= sizeof(new_srv->logo_url)) {
314 				yyerror("%s: logo_url truncated", __func__);
315 				free($2);
316 				YYERROR;
317 			}
318 			free($2);
319 		}
320 		| CUSTOM_CSS STRING {
321 			n = strlcpy(new_srv->custom_css, $2,
322 			    sizeof(new_srv->custom_css));
323 			if (n >= sizeof(new_srv->custom_css)) {
324 				yyerror("%s: custom_css truncated", __func__);
325 				free($2);
326 				YYERROR;
327 			}
328 			free($2);
329 		}
330 		| MAX_REPOS NUMBER {
331 			if ($2 > 0)
332 				new_srv->max_repos = $2;
333 		}
334 		| SHOW_SITE_OWNER boolean {
335 			new_srv->show_site_owner = $2;
336 		}
337 		| SHOW_REPO_OWNER boolean {
338 			new_srv->show_repo_owner = $2;
339 		}
340 		| SHOW_REPO_AGE boolean {
341 			new_srv->show_repo_age = $2;
342 		}
343 		| SHOW_REPO_DESCRIPTION boolean {
344 			new_srv->show_repo_description = $2;
345 		}
346 		| SHOW_REPO_CLONEURL boolean {
347 			new_srv->show_repo_cloneurl = $2;
348 		}
349 		| MAX_REPOS_DISPLAY NUMBER {
350 				new_srv->max_repos_display = $2;
351 		}
352 		| MAX_COMMITS_DISPLAY NUMBER {
353 			if ($2 > 0)
354 				new_srv->max_commits_display = $2;
355 		}
356 		| FCGI_SOCKET boolean {
357 			new_srv->fcgi_socket = $2;
358 		}
359 		| FCGI_SOCKET boolean  {
360 			new_srv->fcgi_socket = $2;
361 		} '{' optnl socketopts2 '}'
362 		| UNIX_SOCKET boolean {
363 			new_srv->unix_socket = $2;
364 		}
365 		| UNIX_SOCKET_NAME STRING {
366 			n = snprintf(new_srv->unix_socket_name,
367 			    sizeof(new_srv->unix_socket_name), "%s%s",
368 			    strlen(gotwebd->httpd_chroot) ?
369 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
370 			if (n < 0) {
371 				yyerror("%s: unix_socket_name truncated",
372 				    __func__);
373 				free($2);
374 				YYERROR;
375 			}
376 			free($2);
377 		}
378 		;
379 
380 serveropts2	: serveropts2 serveropts1 nl
381 		| serveropts1 optnl
382 		;
383 
384 socketopts1	: LISTEN ON STRING {
385 			n = strlcpy(new_srv->fcgi_socket_bind, $3,
386 			    sizeof(new_srv->fcgi_socket_bind));
387 			if (n >= sizeof(new_srv->fcgi_socket_bind)) {
388 				yyerror("%s: fcgi_socket_bind truncated",
389 				    __func__);
390 				free($3);
391 				YYERROR;
392 			}
393 			free($3);
394 		}
395 		| PORT fcgiport {
396 			struct server	*srv;
397 
398 			TAILQ_FOREACH(srv, gotwebd->servers, entry) {
399 				if (srv->fcgi_socket_port == $2) {
400 					yyerror("port already assigned");
401 					YYERROR;
402 				}
403 			}
404 			new_srv->fcgi_socket_port = $2;
405 		}
406 		;
407 
408 socketopts2	: socketopts2 socketopts1 nl
409 		| socketopts1 optnl
410 		;
411 
412 socketopts3	: LISTEN ON STRING {
413 			n = strlcpy(gotwebd->fcgi_socket_bind, $3,
414 			    sizeof(gotwebd->fcgi_socket_bind));
415 			if (n >= sizeof(gotwebd->fcgi_socket_bind)) {
416 				yyerror("%s: fcgi_socket_bind truncated",
417 				    __func__);
418 				free($3);
419 				YYERROR;
420 			}
421 			free($3);
422 		}
423 		| PORT fcgiport {
424 			gotwebd->fcgi_socket_port = $2;
425 		}
426 		;
427 
428 socketopts4	: socketopts4 socketopts3 nl
429 		| socketopts3 optnl
430 		;
431 
432 nl		: '\n' optnl
433 		;
434 
435 optnl		: '\n' optnl		/* zero or more newlines */
436 		| /* empty */
437 		;
438 
439 %%
440 
441 struct keywords {
442 	const char	*k_name;
443 	int		 k_val;
444 };
445 
446 int
447 yyerror(const char *fmt, ...)
448 {
449 	va_list ap;
450 	char *msg;
451 
452 	file->errors++;
453 	va_start(ap, fmt);
454 	if (vasprintf(&msg, fmt, ap) == -1)
455 		fatalx("yyerror vasprintf");
456 	va_end(ap);
457 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
458 	free(msg);
459 	return (0);
460 }
461 
462 int
463 kw_cmp(const void *k, const void *e)
464 {
465 	return (strcmp(k, ((const struct keywords *)e)->k_name));
466 }
467 
468 int
469 lookup(char *s)
470 {
471 	/* This has to be sorted always. */
472 	static const struct keywords keywords[] = {
473 		{ "chroot",			CHROOT },
474 		{ "custom_css",			CUSTOM_CSS },
475 		{ "fcgi_socket",		FCGI_SOCKET },
476 		{ "listen",			LISTEN },
477 		{ "logo",			LOGO },
478 		{ "logo_url"	,		LOGO_URL },
479 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
480 		{ "max_repos",			MAX_REPOS },
481 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
482 		{ "on",				ON },
483 		{ "port",			PORT },
484 		{ "prefork",			PREFORK },
485 		{ "repos_path",			REPOS_PATH },
486 		{ "server",			SERVER },
487 		{ "show_repo_age",		SHOW_REPO_AGE },
488 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
489 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
490 		{ "show_repo_owner",		SHOW_REPO_OWNER },
491 		{ "show_site_owner",		SHOW_SITE_OWNER },
492 		{ "site_link",			SITE_LINK },
493 		{ "site_name",			SITE_NAME },
494 		{ "site_owner",			SITE_OWNER },
495 		{ "unix_socket",		UNIX_SOCKET },
496 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
497 	};
498 	const struct keywords *p;
499 
500 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
501 	    sizeof(keywords[0]), kw_cmp);
502 
503 	if (p)
504 		return (p->k_val);
505 	else
506 		return (STRING);
507 }
508 
509 #define MAXPUSHBACK	128
510 
511 unsigned char *parsebuf;
512 int parseindex;
513 unsigned char pushback_buffer[MAXPUSHBACK];
514 int pushback_index = 0;
515 
516 int
517 lgetc(int quotec)
518 {
519 	int c, next;
520 
521 	if (parsebuf) {
522 		/* Read character from the parsebuffer instead of input. */
523 		if (parseindex >= 0) {
524 			c = parsebuf[parseindex++];
525 			if (c != '\0')
526 				return (c);
527 			parsebuf = NULL;
528 		} else
529 			parseindex++;
530 	}
531 
532 	if (pushback_index)
533 		return (pushback_buffer[--pushback_index]);
534 
535 	if (quotec) {
536 		c = getc(file->stream);
537 		if (c == EOF)
538 			yyerror("reached end of file while parsing "
539 			    "quoted string");
540 		return (c);
541 	}
542 
543 	c = getc(file->stream);
544 	while (c == '\\') {
545 		next = getc(file->stream);
546 		if (next != '\n') {
547 			c = next;
548 			break;
549 		}
550 		yylval.lineno = file->lineno;
551 		file->lineno++;
552 		c = getc(file->stream);
553 	}
554 
555 	return (c);
556 }
557 
558 int
559 lungetc(int c)
560 {
561 	if (c == EOF)
562 		return (EOF);
563 	if (parsebuf) {
564 		parseindex--;
565 		if (parseindex >= 0)
566 			return (c);
567 	}
568 	if (pushback_index < MAXPUSHBACK-1)
569 		return (pushback_buffer[pushback_index++] = c);
570 	else
571 		return (EOF);
572 }
573 
574 int
575 findeol(void)
576 {
577 	int c;
578 
579 	parsebuf = NULL;
580 
581 	/* Skip to either EOF or the first real EOL. */
582 	while (1) {
583 		if (pushback_index)
584 			c = pushback_buffer[--pushback_index];
585 		else
586 			c = lgetc(0);
587 		if (c == '\n') {
588 			file->lineno++;
589 			break;
590 		}
591 		if (c == EOF)
592 			break;
593 	}
594 	return (ERROR);
595 }
596 
597 int
598 yylex(void)
599 {
600 	unsigned char buf[8096];
601 	unsigned char *p, *val;
602 	int quotec, next, c;
603 	int token;
604 
605 top:
606 	p = buf;
607 	c = lgetc(0);
608 	while (c == ' ' || c == '\t')
609 		c = lgetc(0); /* nothing */
610 
611 	yylval.lineno = file->lineno;
612 	if (c == '#') {
613 		c = lgetc(0);
614 		while (c != '\n' && c != EOF)
615 			c = lgetc(0); /* nothing */
616 	}
617 	if (c == '$' && parsebuf == NULL) {
618 		while (1) {
619 			c = lgetc(0);
620 			if (c == EOF)
621 				return (0);
622 
623 			if (p + 1 >= buf + sizeof(buf) - 1) {
624 				yyerror("string too long");
625 				return (findeol());
626 			}
627 			if (isalnum(c) || c == '_') {
628 				*p++ = c;
629 				continue;
630 			}
631 			*p = '\0';
632 			lungetc(c);
633 			break;
634 		}
635 		val = symget(buf);
636 		if (val == NULL) {
637 			yyerror("macro '%s' not defined", buf);
638 			return (findeol());
639 		}
640 		parsebuf = val;
641 		parseindex = 0;
642 		goto top;
643 	}
644 
645 	switch (c) {
646 	case '\'':
647 	case '"':
648 		quotec = c;
649 		while (1) {
650 			c = lgetc(quotec);
651 			if (c == EOF)
652 				return (0);
653 			if (c == '\n') {
654 				file->lineno++;
655 				continue;
656 			} else if (c == '\\') {
657 				next = lgetc(quotec);
658 				if (next == EOF)
659 					return (0);
660 				if (next == quotec || c == ' ' || c == '\t')
661 					c = next;
662 				else if (next == '\n') {
663 					file->lineno++;
664 					continue;
665 				} else
666 					lungetc(next);
667 			} else if (c == quotec) {
668 				*p = '\0';
669 				break;
670 			} else if (c == '\0') {
671 				yyerror("syntax error");
672 				return (findeol());
673 			}
674 			if (p + 1 >= buf + sizeof(buf) - 1) {
675 				yyerror("string too long");
676 				return (findeol());
677 			}
678 			*p++ = c;
679 		}
680 		yylval.v.string = strdup(buf);
681 		if (yylval.v.string == NULL)
682 			err(1, "yylex: strdup");
683 		return (STRING);
684 	}
685 
686 #define allowed_to_end_number(x) \
687 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
688 
689 	if (c == '-' || isdigit(c)) {
690 		do {
691 			*p++ = c;
692 			if ((unsigned)(p-buf) >= sizeof(buf)) {
693 				yyerror("string too long");
694 				return (findeol());
695 			}
696 			c = lgetc(0);
697 		} while (c != EOF && isdigit(c));
698 		lungetc(c);
699 		if (p == buf + 1 && buf[0] == '-')
700 			goto nodigits;
701 		if (c == EOF || allowed_to_end_number(c)) {
702 			const char *errstr = NULL;
703 
704 			*p = '\0';
705 			yylval.v.number = strtonum(buf, LLONG_MIN,
706 			    LLONG_MAX, &errstr);
707 			if (errstr) {
708 				yyerror("\"%s\" invalid number: %s",
709 				    buf, errstr);
710 				return (findeol());
711 			}
712 			return (NUMBER);
713 		} else {
714 nodigits:
715 			while (p > buf + 1)
716 				lungetc(*--p);
717 			c = *--p;
718 			if (c == '-')
719 				return (c);
720 		}
721 	}
722 
723 #define allowed_in_string(x) \
724 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
725 	x != '{' && x != '}' && \
726 	x != '!' && x != '=' && x != '#' && \
727 	x != ','))
728 
729 	if (isalnum(c) || c == ':' || c == '_') {
730 		do {
731 			*p++ = c;
732 			if ((unsigned)(p-buf) >= sizeof(buf)) {
733 				yyerror("string too long");
734 				return (findeol());
735 			}
736 			c = lgetc(0);
737 		} while (c != EOF && (allowed_in_string(c)));
738 		lungetc(c);
739 		*p = '\0';
740 		token = lookup(buf);
741 		if (token == STRING) {
742 			yylval.v.string = strdup(buf);
743 			if (yylval.v.string == NULL)
744 				err(1, "yylex: strdup");
745 		}
746 		return (token);
747 	}
748 	if (c == '\n') {
749 		yylval.lineno = file->lineno;
750 		file->lineno++;
751 	}
752 	if (c == EOF)
753 		return (0);
754 	return (c);
755 }
756 
757 int
758 check_file_secrecy(int fd, const char *fname)
759 {
760 	struct stat st;
761 
762 	if (fstat(fd, &st)) {
763 		log_warn("cannot stat %s", fname);
764 		return (-1);
765 	}
766 	if (st.st_uid != 0 && st.st_uid != getuid()) {
767 		log_warnx("%s: owner not root or current user", fname);
768 		return (-1);
769 	}
770 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
771 		log_warnx("%s: group writable or world read/writable", fname);
772 		return (-1);
773 	}
774 	return (0);
775 }
776 
777 struct file *
778 newfile(const char *name, int secret)
779 {
780 	struct file *nfile;
781 
782 	nfile = calloc(1, sizeof(struct file));
783 	if (nfile == NULL) {
784 		log_warn("calloc");
785 		return (NULL);
786 	}
787 	nfile->name = strdup(name);
788 	if (nfile->name == NULL) {
789 		log_warn("strdup");
790 		free(nfile);
791 		return (NULL);
792 	}
793 	nfile->stream = fopen(nfile->name, "r");
794 	if (nfile->stream == NULL) {
795 		/* no warning, we don't require a conf file */
796 		free(nfile->name);
797 		free(nfile);
798 		return (NULL);
799 	} else if (secret &&
800 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
801 		fclose(nfile->stream);
802 		free(nfile->name);
803 		free(nfile);
804 		return (NULL);
805 	}
806 	nfile->lineno = 1;
807 	return (nfile);
808 }
809 
810 static void
811 closefile(struct file *xfile)
812 {
813 	fclose(xfile->stream);
814 	free(xfile->name);
815 	free(xfile);
816 }
817 
818 static void
819 add_default_server(void)
820 {
821 	new_srv = conf_new_server(D_SITENAME);
822 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
823 }
824 
825 int
826 parse_config(const char *filename, struct gotwebd *env)
827 {
828 	struct sym *sym, *next;
829 
830 	if (config_init(env) == -1)
831 		fatalx("failed to initialize configuration");
832 
833 	gotwebd = env;
834 
835 	file = newfile(filename, 0);
836 	if (file == NULL) {
837 		add_default_server();
838 		sockets_parse_sockets(env);
839 		/* just return, as we don't require a conf file */
840 		return (0);
841 	}
842 
843 	yyparse();
844 	errors = file->errors;
845 	closefile(file);
846 
847 	/* Free macros and check which have not been used. */
848 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
849 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
850 			fprintf(stderr, "warning: macro '%s' not used\n",
851 			    sym->nam);
852 		if (!sym->persist) {
853 			free(sym->nam);
854 			free(sym->val);
855 			TAILQ_REMOVE(&symhead, sym, entry);
856 			free(sym);
857 		}
858 	}
859 
860 	if (errors)
861 		return (-1);
862 
863 	/* just add default server if no config specified */
864 	if (gotwebd->server_cnt == 0)
865 		add_default_server();
866 
867 	/* setup our listening sockets */
868 	sockets_parse_sockets(env);
869 
870 	return (0);
871 }
872 
873 struct server *
874 conf_new_server(const char *name)
875 {
876 	struct server *srv = NULL;
877 	int val;
878 
879 	srv = calloc(1, sizeof(*srv));
880 	if (srv == NULL)
881 		fatalx("%s: calloc", __func__);
882 
883 	n = strlcpy(srv->name, name, sizeof(srv->name));
884 	if (n >= sizeof(srv->name))
885 		fatalx("%s: strlcpy", __func__);
886 	n = snprintf(srv->unix_socket_name,
887 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
888 	    D_UNIX_SOCKET);
889 	if (n < 0)
890 		fatalx("%s: snprintf", __func__);
891 	n = strlcpy(srv->repos_path, D_GOTPATH,
892 	    sizeof(srv->repos_path));
893 	if (n >= sizeof(srv->repos_path))
894 		fatalx("%s: strlcpy", __func__);
895 	n = strlcpy(srv->site_name, D_SITENAME,
896 	    sizeof(srv->site_name));
897 	if (n >= sizeof(srv->site_name))
898 		fatalx("%s: strlcpy", __func__);
899 	n = strlcpy(srv->site_owner, D_SITEOWNER,
900 	    sizeof(srv->site_owner));
901 	if (n >= sizeof(srv->site_owner))
902 		fatalx("%s: strlcpy", __func__);
903 	n = strlcpy(srv->site_link, D_SITELINK,
904 	    sizeof(srv->site_link));
905 	if (n >= sizeof(srv->site_link))
906 		fatalx("%s: strlcpy", __func__);
907 	n = strlcpy(srv->logo, D_GOTLOGO,
908 	    sizeof(srv->logo));
909 	if (n >= sizeof(srv->logo))
910 		fatalx("%s: strlcpy", __func__);
911 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
912 	if (n >= sizeof(srv->logo_url))
913 		fatalx("%s: strlcpy", __func__);
914 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
915 	if (n >= sizeof(srv->custom_css))
916 		fatalx("%s: strlcpy", __func__);
917 
918 	val = getservice(D_FCGI_PORT);
919 	srv->fcgi_socket_port = gotwebd->fcgi_socket_port ?
920 	    gotwebd->fcgi_socket_port: htons(val);
921 
922 	srv->show_site_owner = D_SHOWSOWNER;
923 	srv->show_repo_owner = D_SHOWROWNER;
924 	srv->show_repo_age = D_SHOWAGE;
925 	srv->show_repo_description = D_SHOWDESC;
926 	srv->show_repo_cloneurl = D_SHOWURL;
927 
928 	srv->max_repos_display = D_MAXREPODISP;
929 	srv->max_commits_display = D_MAXCOMMITDISP;
930 	srv->max_repos = D_MAXREPO;
931 
932 	srv->unix_socket = 1;
933 	srv->fcgi_socket = gotwebd->fcgi_socket ? gotwebd->fcgi_socket : 0;
934 
935 	if ((srv->al = calloc(1, sizeof(*srv->al))) == NULL)
936 		fatalx("%s: calloc", __func__);
937 
938 	TAILQ_INIT(srv->al);
939 	TAILQ_INSERT_TAIL(gotwebd->servers, srv, entry);
940 	gotwebd->server_cnt++;
941 
942 	return srv;
943 };
944 
945 int
946 symset(const char *nam, const char *val, int persist)
947 {
948 	struct sym *sym;
949 
950 	TAILQ_FOREACH(sym, &symhead, entry) {
951 		if (strcmp(nam, sym->nam) == 0)
952 			break;
953 	}
954 
955 	if (sym != NULL) {
956 		if (sym->persist == 1)
957 			return (0);
958 		else {
959 			free(sym->nam);
960 			free(sym->val);
961 			TAILQ_REMOVE(&symhead, sym, entry);
962 			free(sym);
963 		}
964 	}
965 	sym = calloc(1, sizeof(*sym));
966 	if (sym == NULL)
967 		return (-1);
968 
969 	sym->nam = strdup(nam);
970 	if (sym->nam == NULL) {
971 		free(sym);
972 		return (-1);
973 	}
974 	sym->val = strdup(val);
975 	if (sym->val == NULL) {
976 		free(sym->nam);
977 		free(sym);
978 		return (-1);
979 	}
980 	sym->used = 0;
981 	sym->persist = persist;
982 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
983 	return (0);
984 }
985 
986 int
987 cmdline_symset(char *s)
988 {
989 	char *sym, *val;
990 	int ret;
991 	size_t len;
992 
993 	val = strrchr(s, '=');
994 	if (val == NULL)
995 		return (-1);
996 
997 	len = strlen(s) - strlen(val) + 1;
998 	sym = malloc(len);
999 	if (sym == NULL)
1000 		fatal("%s: malloc", __func__);
1001 
1002 	memcpy(&sym, s, len);
1003 
1004 	ret = symset(sym, val + 1, 1);
1005 	free(sym);
1006 
1007 	return (ret);
1008 }
1009 
1010 char *
1011 symget(const char *nam)
1012 {
1013 	struct sym *sym;
1014 
1015 	TAILQ_FOREACH(sym, &symhead, entry) {
1016 		if (strcmp(nam, sym->nam) == 0) {
1017 			sym->used = 1;
1018 			return (sym->val);
1019 		}
1020 	}
1021 	return (NULL);
1022 }
1023 
1024 int
1025 getservice(const char *n)
1026 {
1027 	struct servent *s;
1028 	const char *errstr;
1029 	long long llval;
1030 
1031 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1032 	if (errstr) {
1033 		s = getservbyname(n, "tcp");
1034 		if (s == NULL)
1035 			s = getservbyname(n, "udp");
1036 		if (s == NULL)
1037 			return (-1);
1038 		return (s->s_port);
1039 	}
1040 
1041 	return (htons((unsigned short)llval));
1042 }
1043 
1044 struct address *
1045 host_v4(const char *s)
1046 {
1047 	struct in_addr ina;
1048 	struct sockaddr_in *sain;
1049 	struct address *h;
1050 
1051 	memset(&ina, 0, sizeof(ina));
1052 	if (inet_pton(AF_INET, s, &ina) != 1)
1053 		return (NULL);
1054 
1055 	if ((h = calloc(1, sizeof(*h))) == NULL)
1056 		fatal(__func__);
1057 	sain = (struct sockaddr_in *)&h->ss;
1058 	got_sockaddr_inet_init(sain, &ina);
1059 	if (sain->sin_addr.s_addr == INADDR_ANY)
1060 		h->prefixlen = 0; /* 0.0.0.0 address */
1061 	else
1062 		h->prefixlen = -1; /* host address */
1063 	return (h);
1064 }
1065 
1066 struct address *
1067 host_v6(const char *s)
1068 {
1069 	struct addrinfo hints, *res;
1070 	struct sockaddr_in6 *sa_in6, *ra;
1071 	struct address *h = NULL;
1072 
1073 	memset(&hints, 0, sizeof(hints));
1074 	hints.ai_family = AF_INET6;
1075 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1076 	hints.ai_flags = AI_NUMERICHOST;
1077 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1078 		if ((h = calloc(1, sizeof(*h))) == NULL)
1079 			fatal(__func__);
1080 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1081 		ra = (struct sockaddr_in6 *)res->ai_addr;
1082 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1083 		    ra->sin6_scope_id);
1084 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1085 		    sizeof(sa_in6->sin6_addr)) == 0)
1086 			h->prefixlen = 0; /* any address */
1087 		else
1088 			h->prefixlen = -1; /* host address */
1089 		freeaddrinfo(res);
1090 	}
1091 
1092 	return (h);
1093 }
1094 
1095 int
1096 host_dns(const char *s, struct addresslist *al, int max,
1097     in_port_t port, const char *ifname, int ipproto)
1098 {
1099 	struct addrinfo hints, *res0, *res;
1100 	int error, cnt = 0;
1101 	struct sockaddr_in *sain;
1102 	struct sockaddr_in6 *sin6;
1103 	struct address *h;
1104 
1105 	if ((cnt = host_if(s, al, max, port, ifname, ipproto)) != 0)
1106 		return (cnt);
1107 
1108 	memset(&hints, 0, sizeof(hints));
1109 	hints.ai_family = PF_UNSPEC;
1110 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1111 	hints.ai_flags = AI_ADDRCONFIG;
1112 	error = getaddrinfo(s, NULL, &hints, &res0);
1113 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1114 		return (0);
1115 	if (error) {
1116 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1117 		    gai_strerror(error));
1118 		return (-1);
1119 	}
1120 
1121 	for (res = res0; res && cnt < max; res = res->ai_next) {
1122 		if (res->ai_family != AF_INET &&
1123 		    res->ai_family != AF_INET6)
1124 			continue;
1125 		if ((h = calloc(1, sizeof(*h))) == NULL)
1126 			fatal(__func__);
1127 
1128 		if (port)
1129 			h->port = port;
1130 		if (ifname != NULL) {
1131 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1132 			    sizeof(h->ifname)) {
1133 				log_warnx("%s: interface name truncated",
1134 				    __func__);
1135 				freeaddrinfo(res0);
1136 				free(h);
1137 				return (-1);
1138 			}
1139 		}
1140 		if (ipproto != -1)
1141 			h->ipproto = ipproto;
1142 		h->ss.ss_family = res->ai_family;
1143 		h->prefixlen = -1; /* host address */
1144 
1145 		if (res->ai_family == AF_INET) {
1146 			struct sockaddr_in *ra;
1147 			sain = (struct sockaddr_in *)&h->ss;
1148 			ra = (struct sockaddr_in *)res->ai_addr;
1149 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1150 		} else {
1151 			struct sockaddr_in6 *ra;
1152 			sin6 = (struct sockaddr_in6 *)&h->ss;
1153 			ra = (struct sockaddr_in6 *)res->ai_addr;
1154 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1155 		}
1156 
1157 		TAILQ_INSERT_HEAD(al, h, entry);
1158 		cnt++;
1159 	}
1160 	if (cnt == max && res) {
1161 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1162 		    s, max);
1163 	}
1164 	freeaddrinfo(res0);
1165 	return (cnt);
1166 }
1167 
1168 int
1169 host_if(const char *s, struct addresslist *al, int max,
1170     in_port_t port, const char *ifname, int ipproto)
1171 {
1172 	struct ifaddrs *ifap, *p;
1173 	struct sockaddr_in *sain;
1174 	struct sockaddr_in6 *sin6;
1175 	struct address *h;
1176 	int cnt = 0, af;
1177 
1178 	if (getifaddrs(&ifap) == -1)
1179 		fatal("getifaddrs");
1180 
1181 	/* First search for IPv4 addresses */
1182 	af = AF_INET;
1183 
1184  nextaf:
1185 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1186 		if (p->ifa_addr == NULL ||
1187 		    p->ifa_addr->sa_family != af ||
1188 		    (strcmp(s, p->ifa_name) != 0 &&
1189 		    !is_if_in_group(p->ifa_name, s)))
1190 			continue;
1191 		if ((h = calloc(1, sizeof(*h))) == NULL)
1192 			fatal("calloc");
1193 
1194 		if (port)
1195 			h->port = port;
1196 		if (ifname != NULL) {
1197 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1198 			    sizeof(h->ifname)) {
1199 				log_warnx("%s: interface name truncated",
1200 				    __func__);
1201 				free(h);
1202 				freeifaddrs(ifap);
1203 				return (-1);
1204 			}
1205 		}
1206 		if (ipproto != -1)
1207 			h->ipproto = ipproto;
1208 		h->ss.ss_family = af;
1209 		h->prefixlen = -1; /* host address */
1210 
1211 		if (af == AF_INET) {
1212 			struct sockaddr_in *ra;
1213 			sain = (struct sockaddr_in *)&h->ss;
1214 			ra = (struct sockaddr_in *)p->ifa_addr;
1215 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1216 		} else {
1217 			struct sockaddr_in6 *ra;
1218 			sin6 = (struct sockaddr_in6 *)&h->ss;
1219 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1220 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1221 			    ra->sin6_scope_id);
1222 		}
1223 
1224 		TAILQ_INSERT_HEAD(al, h, entry);
1225 		cnt++;
1226 	}
1227 	if (af == AF_INET) {
1228 		/* Next search for IPv6 addresses */
1229 		af = AF_INET6;
1230 		goto nextaf;
1231 	}
1232 
1233 	if (cnt > max) {
1234 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1235 		    s, max);
1236 	}
1237 	freeifaddrs(ifap);
1238 	return (cnt);
1239 }
1240 
1241 int
1242 host(const char *s, struct addresslist *al, int max,
1243     in_port_t port, const char *ifname, int ipproto)
1244 {
1245 	struct address *h;
1246 
1247 	h = host_v4(s);
1248 
1249 	/* IPv6 address? */
1250 	if (h == NULL)
1251 		h = host_v6(s);
1252 
1253 	if (h != NULL) {
1254 		if (port)
1255 			h->port = port;
1256 		if (ifname != NULL) {
1257 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1258 			    sizeof(h->ifname)) {
1259 				log_warnx("%s: interface name truncated",
1260 				    __func__);
1261 				free(h);
1262 				return (-1);
1263 			}
1264 		}
1265 		if (ipproto != -1)
1266 			h->ipproto = ipproto;
1267 
1268 		TAILQ_INSERT_HEAD(al, h, entry);
1269 		return (1);
1270 	}
1271 
1272 	return (host_dns(s, al, max, port, ifname, ipproto));
1273 }
1274 
1275 int
1276 is_if_in_group(const char *ifname, const char *groupname)
1277 {
1278 	unsigned int len;
1279 	struct ifgroupreq ifgr;
1280 	struct ifg_req *ifg;
1281 	int s;
1282 	int ret = 0;
1283 
1284 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1285 		err(1, "socket");
1286 
1287 	memset(&ifgr, 0, sizeof(ifgr));
1288 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1289 		err(1, "IFNAMSIZ");
1290 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1291 		if (errno == EINVAL || errno == ENOTTY)
1292 			goto end;
1293 		err(1, "SIOCGIFGROUP");
1294 	}
1295 
1296 	len = ifgr.ifgr_len;
1297 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1298 	    sizeof(struct ifg_req));
1299 	if (ifgr.ifgr_groups == NULL)
1300 		err(1, "getifgroups");
1301 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1302 		err(1, "SIOCGIFGROUP");
1303 
1304 	ifg = ifgr.ifgr_groups;
1305 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1306 		len -= sizeof(struct ifg_req);
1307 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1308 			ret = 1;
1309 			break;
1310 		}
1311 	}
1312 	free(ifgr.ifgr_groups);
1313 
1314 end:
1315 	close(s);
1316 	return (ret);
1317 }
1318 
1319 int
1320 get_addrs(const char *addr, struct addresslist *al, in_port_t port)
1321 {
1322 	if (strcmp("", addr) == 0) {
1323 		if (host("0.0.0.0", al, 1, port, "0.0.0.0", -1) <= 0) {
1324 			yyerror("invalid listen ip: %s",
1325 			    "0.0.0.0");
1326 			return (-1);
1327 		}
1328 		if (host("::", al, 1, port, "::", -1) <= 0) {
1329 			yyerror("invalid listen ip: %s", "::");
1330 			return (-1);
1331 		}
1332 	} else {
1333 		if (host(addr, al, GOTWEBD_MAXIFACE, port, addr,
1334 		    -1) <= 0) {
1335 			yyerror("invalid listen ip: %s", addr);
1336 			return (-1);
1337 		}
1338 	}
1339 	return (0);
1340 }