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 <limits.h>
41 #include <netdb.h>
42 #include <stdarg.h>
43 #include <stdlib.h>
44 #include <stdio.h>
45 #include <string.h>
46 #include <syslog.h>
47 #include <unistd.h>
48 
49 #include "proc.h"
50 #include "gotwebd.h"
51 #include "got_sockaddr.h"
52 
53 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
54 static struct file {
55 	TAILQ_ENTRY(file)	 entry;
56 	FILE			*stream;
57 	char			*name;
58 	int			 lineno;
59 	int			 errors;
60 } *file;
61 struct file	*newfile(const char *, int);
62 static void	 closefile(struct file *);
63 int		 check_file_secrecy(int, const char *);
64 int		 yyparse(void);
65 int		 yylex(void);
66 int		 yyerror(const char *, ...)
67     __attribute__((__format__ (printf, 1, 2)))
68     __attribute__((__nonnull__ (1)));
69 int		 kw_cmp(const void *, const void *);
70 int		 lookup(char *);
71 int		 lgetc(int);
72 int		 lungetc(int);
73 int		 findeol(void);
74 
75 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
76 struct sym {
77 	TAILQ_ENTRY(sym)	 entry;
78 	int			 used;
79 	int			 persist;
80 	char			*nam;
81 	char			*val;
82 };
83 
84 int	 symset(const char *, const char *, int);
85 char	*symget(const char *);
86 
87 static int		 errors;
88 
89 static struct gotwebd		*gotwebd;
90 static struct server		*new_srv;
91 static struct server		*conf_new_server(const char *);
92 int				 getservice(const char *);
93 int				 n;
94 
95 int		 get_addrs(const char *, struct addresslist *, in_port_t);
96 struct address	*host_v4(const char *);
97 struct address	*host_v6(const char *);
98 int		 host_dns(const char *, struct addresslist *,
99 		    int, in_port_t, const char *, int);
100 int		 host_if(const char *, struct addresslist *,
101 		    int, in_port_t, const char *, int);
102 int		 host(const char *, struct addresslist *,
103 		    int, in_port_t, const char *, int);
104 int		 is_if_in_group(const char *, const char *);
105 
106 typedef struct {
107 	union {
108 		long long	 number;
109 		char		*string;
110 		in_port_t	 port;
111 	} v;
112 	int lineno;
113 } YYSTYPE;
114 
115 %}
116 
117 %token	LISTEN WWW_PATH MAX_REPOS SITE_NAME SITE_OWNER SITE_LINK LOGO
118 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
119 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
120 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK FCGI_SOCKET
121 %token	UNIX_SOCKET UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS
122 
123 %token	<v.string>	STRING
124 %type	<v.port>	fcgiport
125 %token	<v.number>	NUMBER
126 %type	<v.number>	boolean
127 
128 %%
129 
130 grammar		:
131 		| grammar '\n'
132 		| grammar main '\n'
133 		| grammar server '\n'
134 		;
135 
136 boolean		: STRING {
137 			if (strcasecmp($1, "1") == 0 ||
138 			    strcasecmp($1, "yes") == 0 ||
139 			    strcasecmp($1, "on") == 0)
140 				$$ = 1;
141 			else if (strcasecmp($1, "0") == 0 ||
142 			    strcasecmp($1, "off") == 0 ||
143 			    strcasecmp($1, "no") == 0)
144 				$$ = 0;
145 			else {
146 				yyerror("invalid boolean value '%s'", $1);
147 				free($1);
148 				YYERROR;
149 			}
150 			free($1);
151 		}
152 		| ON { $$ = 1; }
153 		| NUMBER { $$ = $1; }
154 		;
155 
156 fcgiport	: NUMBER {
157 			if ($1 <= 0 || $1 > (int)USHRT_MAX) {
158 				yyerror("invalid port: %lld", $1);
159 				YYERROR;
160 			}
161 			$$ = htons($1);
162 		}
163 		| STRING {
164 			int	 val;
165 
166 			if ((val = getservice($1)) == -1) {
167 				yyerror("invalid port: %s", $1);
168 				free($1);
169 				YYERROR;
170 			}
171 			free($1);
172 
173 			$$ = val;
174 		}
175 		;
176 
177 main		: PREFORK NUMBER {
178 			gotwebd->prefork_gotwebd = $2;
179 		}
180 		| CHROOT STRING {
181 			n = strlcpy(gotwebd->httpd_chroot, $2,
182 			    sizeof(gotwebd->httpd_chroot));
183 			if (n >= sizeof(gotwebd->httpd_chroot)) {
184 				yyerror("%s: httpd_chroot truncated", __func__);
185 				free($2);
186 				YYERROR;
187 			}
188 			free($2);
189 		}
190 		| FCGI_SOCKET boolean {
191 			gotwebd->fcgi_socket = $2;
192 		}
193 		| FCGI_SOCKET boolean  {
194 			gotwebd->fcgi_socket = $2;
195 		} '{' optnl socketopts4 '}'
196 		| UNIX_SOCKET boolean {
197 			gotwebd->unix_socket = $2;
198 		}
199 		| UNIX_SOCKET_NAME STRING {
200 			n = snprintf(gotwebd->unix_socket_name,
201 			    sizeof(gotwebd->unix_socket_name), "%s%s",
202 			    strlen(gotwebd->httpd_chroot) ?
203 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
204 			if (n < 0 ||
205 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
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 (new_srv->fcgi_socket) {
254 				if (get_addrs(new_srv->fcgi_socket_bind,
255 				    &new_srv->al, new_srv->fcgi_socket_port)
256 				    == -1) {
257 					yyerror("could not get tcp iface addr");
258 					YYERROR;
259 				}
260 			}
261 		}
262 		;
263 
264 serveropts1	: REPOS_PATH STRING {
265 			n = strlcpy(new_srv->repos_path, $2,
266 			    sizeof(new_srv->repos_path));
267 			if (n >= sizeof(new_srv->repos_path)) {
268 				yyerror("%s: repos_path truncated", __func__);
269 				free($2);
270 				YYERROR;
271 			}
272 			free($2);
273 		}
274 		| SITE_NAME STRING {
275 			n = strlcpy(new_srv->site_name, $2,
276 			    sizeof(new_srv->site_name));
277 			if (n >= sizeof(new_srv->site_name)) {
278 				yyerror("%s: site_name truncated", __func__);
279 				free($2);
280 				YYERROR;
281 			}
282 			free($2);
283 		}
284 		| SITE_OWNER STRING {
285 			n = strlcpy(new_srv->site_owner, $2,
286 			    sizeof(new_srv->site_owner));
287 			if (n >= sizeof(new_srv->site_owner)) {
288 				yyerror("%s: site_owner truncated", __func__);
289 				free($2);
290 				YYERROR;
291 			}
292 			free($2);
293 		}
294 		| SITE_LINK STRING {
295 			n = strlcpy(new_srv->site_link, $2,
296 			    sizeof(new_srv->site_link));
297 			if (n >= sizeof(new_srv->site_link)) {
298 				yyerror("%s: site_link truncated", __func__);
299 				free($2);
300 				YYERROR;
301 			}
302 			free($2);
303 		}
304 		| LOGO STRING {
305 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
306 			if (n >= sizeof(new_srv->logo)) {
307 				yyerror("%s: logo truncated", __func__);
308 				free($2);
309 				YYERROR;
310 			}
311 			free($2);
312 		}
313 		| LOGO_URL STRING {
314 			n = strlcpy(new_srv->logo_url, $2,
315 			    sizeof(new_srv->logo_url));
316 			if (n >= sizeof(new_srv->logo_url)) {
317 				yyerror("%s: logo_url truncated", __func__);
318 				free($2);
319 				YYERROR;
320 			}
321 			free($2);
322 		}
323 		| CUSTOM_CSS STRING {
324 			n = strlcpy(new_srv->custom_css, $2,
325 			    sizeof(new_srv->custom_css));
326 			if (n >= sizeof(new_srv->custom_css)) {
327 				yyerror("%s: custom_css truncated", __func__);
328 				free($2);
329 				YYERROR;
330 			}
331 			free($2);
332 		}
333 		| MAX_REPOS NUMBER {
334 			if ($2 > 0)
335 				new_srv->max_repos = $2;
336 		}
337 		| SHOW_SITE_OWNER boolean {
338 			new_srv->show_site_owner = $2;
339 		}
340 		| SHOW_REPO_OWNER boolean {
341 			new_srv->show_repo_owner = $2;
342 		}
343 		| SHOW_REPO_AGE boolean {
344 			new_srv->show_repo_age = $2;
345 		}
346 		| SHOW_REPO_DESCRIPTION boolean {
347 			new_srv->show_repo_description = $2;
348 		}
349 		| SHOW_REPO_CLONEURL boolean {
350 			new_srv->show_repo_cloneurl = $2;
351 		}
352 		| MAX_REPOS_DISPLAY NUMBER {
353 				new_srv->max_repos_display = $2;
354 		}
355 		| MAX_COMMITS_DISPLAY NUMBER {
356 			if ($2 > 0)
357 				new_srv->max_commits_display = $2;
358 		}
359 		| FCGI_SOCKET boolean {
360 			new_srv->fcgi_socket = $2;
361 		}
362 		| FCGI_SOCKET boolean  {
363 			new_srv->fcgi_socket = $2;
364 		} '{' optnl socketopts2 '}'
365 		| UNIX_SOCKET boolean {
366 			new_srv->unix_socket = $2;
367 		}
368 		| UNIX_SOCKET_NAME STRING {
369 			n = snprintf(new_srv->unix_socket_name,
370 			    sizeof(new_srv->unix_socket_name), "%s%s",
371 			    strlen(gotwebd->httpd_chroot) ?
372 			    gotwebd->httpd_chroot : D_HTTPD_CHROOT, $2);
373 			if (n < 0 ||
374 			    (size_t)n >= sizeof(new_srv->unix_socket_name)) {
375 				yyerror("%s: unix_socket_name truncated",
376 				    __func__);
377 				free($2);
378 				YYERROR;
379 			}
380 			free($2);
381 		}
382 		;
383 
384 serveropts2	: serveropts2 serveropts1 nl
385 		| serveropts1 optnl
386 		;
387 
388 socketopts1	: LISTEN ON STRING {
389 			n = strlcpy(new_srv->fcgi_socket_bind, $3,
390 			    sizeof(new_srv->fcgi_socket_bind));
391 			if (n >= sizeof(new_srv->fcgi_socket_bind)) {
392 				yyerror("%s: fcgi_socket_bind truncated",
393 				    __func__);
394 				free($3);
395 				YYERROR;
396 			}
397 			free($3);
398 		}
399 		| PORT fcgiport {
400 			struct server	*srv;
401 
402 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
403 				if (srv->fcgi_socket_port == $2) {
404 					yyerror("port already assigned");
405 					YYERROR;
406 				}
407 			}
408 			new_srv->fcgi_socket_port = $2;
409 		}
410 		;
411 
412 socketopts2	: socketopts2 socketopts1 nl
413 		| socketopts1 optnl
414 		;
415 
416 socketopts3	: LISTEN ON STRING {
417 			n = strlcpy(gotwebd->fcgi_socket_bind, $3,
418 			    sizeof(gotwebd->fcgi_socket_bind));
419 			if (n >= sizeof(gotwebd->fcgi_socket_bind)) {
420 				yyerror("%s: fcgi_socket_bind truncated",
421 				    __func__);
422 				free($3);
423 				YYERROR;
424 			}
425 			free($3);
426 		}
427 		| PORT fcgiport {
428 			gotwebd->fcgi_socket_port = $2;
429 		}
430 		;
431 
432 socketopts4	: socketopts4 socketopts3 nl
433 		| socketopts3 optnl
434 		;
435 
436 nl		: '\n' optnl
437 		;
438 
439 optnl		: '\n' optnl		/* zero or more newlines */
440 		| /* empty */
441 		;
442 
443 %%
444 
445 struct keywords {
446 	const char	*k_name;
447 	int		 k_val;
448 };
449 
450 int
451 yyerror(const char *fmt, ...)
452 {
453 	va_list ap;
454 	char *msg;
455 
456 	file->errors++;
457 	va_start(ap, fmt);
458 	if (vasprintf(&msg, fmt, ap) == -1)
459 		fatalx("yyerror vasprintf");
460 	va_end(ap);
461 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
462 	free(msg);
463 	return (0);
464 }
465 
466 int
467 kw_cmp(const void *k, const void *e)
468 {
469 	return (strcmp(k, ((const struct keywords *)e)->k_name));
470 }
471 
472 int
473 lookup(char *s)
474 {
475 	/* This has to be sorted always. */
476 	static const struct keywords keywords[] = {
477 		{ "chroot",			CHROOT },
478 		{ "custom_css",			CUSTOM_CSS },
479 		{ "fcgi_socket",		FCGI_SOCKET },
480 		{ "listen",			LISTEN },
481 		{ "logo",			LOGO },
482 		{ "logo_url"	,		LOGO_URL },
483 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
484 		{ "max_repos",			MAX_REPOS },
485 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
486 		{ "on",				ON },
487 		{ "port",			PORT },
488 		{ "prefork",			PREFORK },
489 		{ "repos_path",			REPOS_PATH },
490 		{ "server",			SERVER },
491 		{ "show_repo_age",		SHOW_REPO_AGE },
492 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
493 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
494 		{ "show_repo_owner",		SHOW_REPO_OWNER },
495 		{ "show_site_owner",		SHOW_SITE_OWNER },
496 		{ "site_link",			SITE_LINK },
497 		{ "site_name",			SITE_NAME },
498 		{ "site_owner",			SITE_OWNER },
499 		{ "unix_socket",		UNIX_SOCKET },
500 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
501 	};
502 	const struct keywords *p;
503 
504 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
505 	    sizeof(keywords[0]), kw_cmp);
506 
507 	if (p)
508 		return (p->k_val);
509 	else
510 		return (STRING);
511 }
512 
513 #define MAXPUSHBACK	128
514 
515 unsigned char *parsebuf;
516 int parseindex;
517 unsigned char pushback_buffer[MAXPUSHBACK];
518 int pushback_index = 0;
519 
520 int
521 lgetc(int quotec)
522 {
523 	int c, next;
524 
525 	if (parsebuf) {
526 		/* Read character from the parsebuffer instead of input. */
527 		if (parseindex >= 0) {
528 			c = parsebuf[parseindex++];
529 			if (c != '\0')
530 				return (c);
531 			parsebuf = NULL;
532 		} else
533 			parseindex++;
534 	}
535 
536 	if (pushback_index)
537 		return (pushback_buffer[--pushback_index]);
538 
539 	if (quotec) {
540 		c = getc(file->stream);
541 		if (c == EOF)
542 			yyerror("reached end of file while parsing "
543 			    "quoted string");
544 		return (c);
545 	}
546 
547 	c = getc(file->stream);
548 	while (c == '\\') {
549 		next = getc(file->stream);
550 		if (next != '\n') {
551 			c = next;
552 			break;
553 		}
554 		yylval.lineno = file->lineno;
555 		file->lineno++;
556 		c = getc(file->stream);
557 	}
558 
559 	return (c);
560 }
561 
562 int
563 lungetc(int c)
564 {
565 	if (c == EOF)
566 		return (EOF);
567 	if (parsebuf) {
568 		parseindex--;
569 		if (parseindex >= 0)
570 			return (c);
571 	}
572 	if (pushback_index < MAXPUSHBACK-1)
573 		return (pushback_buffer[pushback_index++] = c);
574 	else
575 		return (EOF);
576 }
577 
578 int
579 findeol(void)
580 {
581 	int c;
582 
583 	parsebuf = NULL;
584 
585 	/* Skip to either EOF or the first real EOL. */
586 	while (1) {
587 		if (pushback_index)
588 			c = pushback_buffer[--pushback_index];
589 		else
590 			c = lgetc(0);
591 		if (c == '\n') {
592 			file->lineno++;
593 			break;
594 		}
595 		if (c == EOF)
596 			break;
597 	}
598 	return (ERROR);
599 }
600 
601 int
602 yylex(void)
603 {
604 	unsigned char buf[8096];
605 	unsigned char *p, *val;
606 	int quotec, next, c;
607 	int token;
608 
609 top:
610 	p = buf;
611 	c = lgetc(0);
612 	while (c == ' ' || c == '\t')
613 		c = lgetc(0); /* nothing */
614 
615 	yylval.lineno = file->lineno;
616 	if (c == '#') {
617 		c = lgetc(0);
618 		while (c != '\n' && c != EOF)
619 			c = lgetc(0); /* nothing */
620 	}
621 	if (c == '$' && parsebuf == NULL) {
622 		while (1) {
623 			c = lgetc(0);
624 			if (c == EOF)
625 				return (0);
626 
627 			if (p + 1 >= buf + sizeof(buf) - 1) {
628 				yyerror("string too long");
629 				return (findeol());
630 			}
631 			if (isalnum(c) || c == '_') {
632 				*p++ = c;
633 				continue;
634 			}
635 			*p = '\0';
636 			lungetc(c);
637 			break;
638 		}
639 		val = symget(buf);
640 		if (val == NULL) {
641 			yyerror("macro '%s' not defined", buf);
642 			return (findeol());
643 		}
644 		parsebuf = val;
645 		parseindex = 0;
646 		goto top;
647 	}
648 
649 	switch (c) {
650 	case '\'':
651 	case '"':
652 		quotec = c;
653 		while (1) {
654 			c = lgetc(quotec);
655 			if (c == EOF)
656 				return (0);
657 			if (c == '\n') {
658 				file->lineno++;
659 				continue;
660 			} else if (c == '\\') {
661 				next = lgetc(quotec);
662 				if (next == EOF)
663 					return (0);
664 				if (next == quotec || c == ' ' || c == '\t')
665 					c = next;
666 				else if (next == '\n') {
667 					file->lineno++;
668 					continue;
669 				} else
670 					lungetc(next);
671 			} else if (c == quotec) {
672 				*p = '\0';
673 				break;
674 			} else if (c == '\0') {
675 				yyerror("syntax error");
676 				return (findeol());
677 			}
678 			if (p + 1 >= buf + sizeof(buf) - 1) {
679 				yyerror("string too long");
680 				return (findeol());
681 			}
682 			*p++ = c;
683 		}
684 		yylval.v.string = strdup(buf);
685 		if (yylval.v.string == NULL)
686 			err(1, "yylex: strdup");
687 		return (STRING);
688 	}
689 
690 #define allowed_to_end_number(x) \
691 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
692 
693 	if (c == '-' || isdigit(c)) {
694 		do {
695 			*p++ = c;
696 			if ((unsigned)(p-buf) >= sizeof(buf)) {
697 				yyerror("string too long");
698 				return (findeol());
699 			}
700 			c = lgetc(0);
701 		} while (c != EOF && isdigit(c));
702 		lungetc(c);
703 		if (p == buf + 1 && buf[0] == '-')
704 			goto nodigits;
705 		if (c == EOF || allowed_to_end_number(c)) {
706 			const char *errstr = NULL;
707 
708 			*p = '\0';
709 			yylval.v.number = strtonum(buf, LLONG_MIN,
710 			    LLONG_MAX, &errstr);
711 			if (errstr) {
712 				yyerror("\"%s\" invalid number: %s",
713 				    buf, errstr);
714 				return (findeol());
715 			}
716 			return (NUMBER);
717 		} else {
718 nodigits:
719 			while (p > buf + 1)
720 				lungetc(*--p);
721 			c = *--p;
722 			if (c == '-')
723 				return (c);
724 		}
725 	}
726 
727 #define allowed_in_string(x) \
728 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
729 	x != '{' && x != '}' && \
730 	x != '!' && x != '=' && x != '#' && \
731 	x != ','))
732 
733 	if (isalnum(c) || c == ':' || c == '_') {
734 		do {
735 			*p++ = c;
736 			if ((unsigned)(p-buf) >= sizeof(buf)) {
737 				yyerror("string too long");
738 				return (findeol());
739 			}
740 			c = lgetc(0);
741 		} while (c != EOF && (allowed_in_string(c)));
742 		lungetc(c);
743 		*p = '\0';
744 		token = lookup(buf);
745 		if (token == STRING) {
746 			yylval.v.string = strdup(buf);
747 			if (yylval.v.string == NULL)
748 				err(1, "yylex: strdup");
749 		}
750 		return (token);
751 	}
752 	if (c == '\n') {
753 		yylval.lineno = file->lineno;
754 		file->lineno++;
755 	}
756 	if (c == EOF)
757 		return (0);
758 	return (c);
759 }
760 
761 int
762 check_file_secrecy(int fd, const char *fname)
763 {
764 	struct stat st;
765 
766 	if (fstat(fd, &st)) {
767 		log_warn("cannot stat %s", fname);
768 		return (-1);
769 	}
770 	if (st.st_uid != 0 && st.st_uid != getuid()) {
771 		log_warnx("%s: owner not root or current user", fname);
772 		return (-1);
773 	}
774 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
775 		log_warnx("%s: group writable or world read/writable", fname);
776 		return (-1);
777 	}
778 	return (0);
779 }
780 
781 struct file *
782 newfile(const char *name, int secret)
783 {
784 	struct file *nfile;
785 
786 	nfile = calloc(1, sizeof(struct file));
787 	if (nfile == NULL) {
788 		log_warn("calloc");
789 		return (NULL);
790 	}
791 	nfile->name = strdup(name);
792 	if (nfile->name == NULL) {
793 		log_warn("strdup");
794 		free(nfile);
795 		return (NULL);
796 	}
797 	nfile->stream = fopen(nfile->name, "r");
798 	if (nfile->stream == NULL) {
799 		/* no warning, we don't require a conf file */
800 		free(nfile->name);
801 		free(nfile);
802 		return (NULL);
803 	} else if (secret &&
804 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
805 		fclose(nfile->stream);
806 		free(nfile->name);
807 		free(nfile);
808 		return (NULL);
809 	}
810 	nfile->lineno = 1;
811 	return (nfile);
812 }
813 
814 static void
815 closefile(struct file *xfile)
816 {
817 	fclose(xfile->stream);
818 	free(xfile->name);
819 	free(xfile);
820 }
821 
822 static void
823 add_default_server(void)
824 {
825 	new_srv = conf_new_server(D_SITENAME);
826 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
827 }
828 
829 int
830 parse_config(const char *filename, struct gotwebd *env)
831 {
832 	struct sym *sym, *next;
833 
834 	if (config_init(env) == -1)
835 		fatalx("failed to initialize configuration");
836 
837 	gotwebd = env;
838 
839 	file = newfile(filename, 0);
840 	if (file == NULL) {
841 		add_default_server();
842 		sockets_parse_sockets(env);
843 		/* just return, as we don't require a conf file */
844 		return (0);
845 	}
846 
847 	yyparse();
848 	errors = file->errors;
849 	closefile(file);
850 
851 	/* Free macros and check which have not been used. */
852 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
853 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
854 			fprintf(stderr, "warning: macro '%s' not used\n",
855 			    sym->nam);
856 		if (!sym->persist) {
857 			free(sym->nam);
858 			free(sym->val);
859 			TAILQ_REMOVE(&symhead, sym, entry);
860 			free(sym);
861 		}
862 	}
863 
864 	if (errors)
865 		return (-1);
866 
867 	/* just add default server if no config specified */
868 	if (gotwebd->server_cnt == 0)
869 		add_default_server();
870 
871 	/* setup our listening sockets */
872 	sockets_parse_sockets(env);
873 
874 	return (0);
875 }
876 
877 struct server *
878 conf_new_server(const char *name)
879 {
880 	struct server *srv = NULL;
881 	int val;
882 
883 	srv = calloc(1, sizeof(*srv));
884 	if (srv == NULL)
885 		fatalx("%s: calloc", __func__);
886 
887 	n = strlcpy(srv->name, name, sizeof(srv->name));
888 	if (n >= sizeof(srv->name))
889 		fatalx("%s: strlcpy", __func__);
890 	n = snprintf(srv->unix_socket_name,
891 	    sizeof(srv->unix_socket_name), "%s%s", D_HTTPD_CHROOT,
892 	    D_UNIX_SOCKET);
893 	if (n < 0 || (size_t)n >= sizeof(srv->unix_socket_name))
894 		fatalx("%s: snprintf", __func__);
895 	n = strlcpy(srv->repos_path, D_GOTPATH,
896 	    sizeof(srv->repos_path));
897 	if (n >= sizeof(srv->repos_path))
898 		fatalx("%s: strlcpy", __func__);
899 	n = strlcpy(srv->site_name, D_SITENAME,
900 	    sizeof(srv->site_name));
901 	if (n >= sizeof(srv->site_name))
902 		fatalx("%s: strlcpy", __func__);
903 	n = strlcpy(srv->site_owner, D_SITEOWNER,
904 	    sizeof(srv->site_owner));
905 	if (n >= sizeof(srv->site_owner))
906 		fatalx("%s: strlcpy", __func__);
907 	n = strlcpy(srv->site_link, D_SITELINK,
908 	    sizeof(srv->site_link));
909 	if (n >= sizeof(srv->site_link))
910 		fatalx("%s: strlcpy", __func__);
911 	n = strlcpy(srv->logo, D_GOTLOGO,
912 	    sizeof(srv->logo));
913 	if (n >= sizeof(srv->logo))
914 		fatalx("%s: strlcpy", __func__);
915 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
916 	if (n >= sizeof(srv->logo_url))
917 		fatalx("%s: strlcpy", __func__);
918 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
919 	if (n >= sizeof(srv->custom_css))
920 		fatalx("%s: strlcpy", __func__);
921 
922 	val = getservice(D_FCGI_PORT);
923 	srv->fcgi_socket_port = gotwebd->fcgi_socket_port ?
924 	    gotwebd->fcgi_socket_port: htons(val);
925 
926 	srv->show_site_owner = D_SHOWSOWNER;
927 	srv->show_repo_owner = D_SHOWROWNER;
928 	srv->show_repo_age = D_SHOWAGE;
929 	srv->show_repo_description = D_SHOWDESC;
930 	srv->show_repo_cloneurl = D_SHOWURL;
931 
932 	srv->max_repos_display = D_MAXREPODISP;
933 	srv->max_commits_display = D_MAXCOMMITDISP;
934 	srv->max_repos = D_MAXREPO;
935 
936 	srv->unix_socket = 1;
937 	srv->fcgi_socket = gotwebd->fcgi_socket ? gotwebd->fcgi_socket : 0;
938 
939 	TAILQ_INIT(&srv->al);
940 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
941 	gotwebd->server_cnt++;
942 
943 	return srv;
944 };
945 
946 int
947 symset(const char *nam, const char *val, int persist)
948 {
949 	struct sym *sym;
950 
951 	TAILQ_FOREACH(sym, &symhead, entry) {
952 		if (strcmp(nam, sym->nam) == 0)
953 			break;
954 	}
955 
956 	if (sym != NULL) {
957 		if (sym->persist == 1)
958 			return (0);
959 		else {
960 			free(sym->nam);
961 			free(sym->val);
962 			TAILQ_REMOVE(&symhead, sym, entry);
963 			free(sym);
964 		}
965 	}
966 	sym = calloc(1, sizeof(*sym));
967 	if (sym == NULL)
968 		return (-1);
969 
970 	sym->nam = strdup(nam);
971 	if (sym->nam == NULL) {
972 		free(sym);
973 		return (-1);
974 	}
975 	sym->val = strdup(val);
976 	if (sym->val == NULL) {
977 		free(sym->nam);
978 		free(sym);
979 		return (-1);
980 	}
981 	sym->used = 0;
982 	sym->persist = persist;
983 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
984 	return (0);
985 }
986 
987 int
988 cmdline_symset(char *s)
989 {
990 	char *sym, *val;
991 	int ret;
992 	size_t len;
993 
994 	val = strrchr(s, '=');
995 	if (val == NULL)
996 		return (-1);
997 
998 	len = strlen(s) - strlen(val) + 1;
999 	sym = malloc(len);
1000 	if (sym == NULL)
1001 		fatal("%s: malloc", __func__);
1002 
1003 	memcpy(&sym, s, len);
1004 
1005 	ret = symset(sym, val + 1, 1);
1006 	free(sym);
1007 
1008 	return (ret);
1009 }
1010 
1011 char *
1012 symget(const char *nam)
1013 {
1014 	struct sym *sym;
1015 
1016 	TAILQ_FOREACH(sym, &symhead, entry) {
1017 		if (strcmp(nam, sym->nam) == 0) {
1018 			sym->used = 1;
1019 			return (sym->val);
1020 		}
1021 	}
1022 	return (NULL);
1023 }
1024 
1025 int
1026 getservice(const char *n)
1027 {
1028 	struct servent *s;
1029 	const char *errstr;
1030 	long long llval;
1031 
1032 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1033 	if (errstr) {
1034 		s = getservbyname(n, "tcp");
1035 		if (s == NULL)
1036 			s = getservbyname(n, "udp");
1037 		if (s == NULL)
1038 			return (-1);
1039 		return (s->s_port);
1040 	}
1041 
1042 	return (htons((unsigned short)llval));
1043 }
1044 
1045 struct address *
1046 host_v4(const char *s)
1047 {
1048 	struct in_addr ina;
1049 	struct sockaddr_in *sain;
1050 	struct address *h;
1051 
1052 	memset(&ina, 0, sizeof(ina));
1053 	if (inet_pton(AF_INET, s, &ina) != 1)
1054 		return (NULL);
1055 
1056 	if ((h = calloc(1, sizeof(*h))) == NULL)
1057 		fatal(__func__);
1058 	sain = (struct sockaddr_in *)&h->ss;
1059 	got_sockaddr_inet_init(sain, &ina);
1060 	if (sain->sin_addr.s_addr == INADDR_ANY)
1061 		h->prefixlen = 0; /* 0.0.0.0 address */
1062 	else
1063 		h->prefixlen = -1; /* host address */
1064 	return (h);
1065 }
1066 
1067 struct address *
1068 host_v6(const char *s)
1069 {
1070 	struct addrinfo hints, *res;
1071 	struct sockaddr_in6 *sa_in6, *ra;
1072 	struct address *h = NULL;
1073 
1074 	memset(&hints, 0, sizeof(hints));
1075 	hints.ai_family = AF_INET6;
1076 	hints.ai_socktype = SOCK_DGRAM; /* dummy */
1077 	hints.ai_flags = AI_NUMERICHOST;
1078 	if (getaddrinfo(s, "0", &hints, &res) == 0) {
1079 		if ((h = calloc(1, sizeof(*h))) == NULL)
1080 			fatal(__func__);
1081 		sa_in6 = (struct sockaddr_in6 *)&h->ss;
1082 		ra = (struct sockaddr_in6 *)res->ai_addr;
1083 		got_sockaddr_inet6_init(sa_in6, &ra->sin6_addr,
1084 		    ra->sin6_scope_id);
1085 		if (memcmp(&sa_in6->sin6_addr, &in6addr_any,
1086 		    sizeof(sa_in6->sin6_addr)) == 0)
1087 			h->prefixlen = 0; /* any address */
1088 		else
1089 			h->prefixlen = -1; /* host address */
1090 		freeaddrinfo(res);
1091 	}
1092 
1093 	return (h);
1094 }
1095 
1096 int
1097 host_dns(const char *s, struct addresslist *al, int max,
1098     in_port_t port, const char *ifname, int ipproto)
1099 {
1100 	struct addrinfo hints, *res0, *res;
1101 	int error, cnt = 0;
1102 	struct sockaddr_in *sain;
1103 	struct sockaddr_in6 *sin6;
1104 	struct address *h;
1105 
1106 	if ((cnt = host_if(s, al, max, port, ifname, ipproto)) != 0)
1107 		return (cnt);
1108 
1109 	memset(&hints, 0, sizeof(hints));
1110 	hints.ai_family = PF_UNSPEC;
1111 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
1112 	hints.ai_flags = AI_ADDRCONFIG;
1113 	error = getaddrinfo(s, NULL, &hints, &res0);
1114 	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
1115 		return (0);
1116 	if (error) {
1117 		log_warnx("%s: could not parse \"%s\": %s", __func__, s,
1118 		    gai_strerror(error));
1119 		return (-1);
1120 	}
1121 
1122 	for (res = res0; res && cnt < max; res = res->ai_next) {
1123 		if (res->ai_family != AF_INET &&
1124 		    res->ai_family != AF_INET6)
1125 			continue;
1126 		if ((h = calloc(1, sizeof(*h))) == NULL)
1127 			fatal(__func__);
1128 
1129 		if (port)
1130 			h->port = port;
1131 		if (ifname != NULL) {
1132 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1133 			    sizeof(h->ifname)) {
1134 				log_warnx("%s: interface name truncated",
1135 				    __func__);
1136 				freeaddrinfo(res0);
1137 				free(h);
1138 				return (-1);
1139 			}
1140 		}
1141 		if (ipproto != -1)
1142 			h->ipproto = ipproto;
1143 		h->ss.ss_family = res->ai_family;
1144 		h->prefixlen = -1; /* host address */
1145 
1146 		if (res->ai_family == AF_INET) {
1147 			struct sockaddr_in *ra;
1148 			sain = (struct sockaddr_in *)&h->ss;
1149 			ra = (struct sockaddr_in *)res->ai_addr;
1150 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1151 		} else {
1152 			struct sockaddr_in6 *ra;
1153 			sin6 = (struct sockaddr_in6 *)&h->ss;
1154 			ra = (struct sockaddr_in6 *)res->ai_addr;
1155 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr, 0);
1156 		}
1157 
1158 		TAILQ_INSERT_HEAD(al, h, entry);
1159 		cnt++;
1160 	}
1161 	if (cnt == max && res) {
1162 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1163 		    s, max);
1164 	}
1165 	freeaddrinfo(res0);
1166 	return (cnt);
1167 }
1168 
1169 int
1170 host_if(const char *s, struct addresslist *al, int max,
1171     in_port_t port, const char *ifname, int ipproto)
1172 {
1173 	struct ifaddrs *ifap, *p;
1174 	struct sockaddr_in *sain;
1175 	struct sockaddr_in6 *sin6;
1176 	struct address *h;
1177 	int cnt = 0, af;
1178 
1179 	if (getifaddrs(&ifap) == -1)
1180 		fatal("getifaddrs");
1181 
1182 	/* First search for IPv4 addresses */
1183 	af = AF_INET;
1184 
1185  nextaf:
1186 	for (p = ifap; p != NULL && cnt < max; p = p->ifa_next) {
1187 		if (p->ifa_addr == NULL ||
1188 		    p->ifa_addr->sa_family != af ||
1189 		    (strcmp(s, p->ifa_name) != 0 &&
1190 		    !is_if_in_group(p->ifa_name, s)))
1191 			continue;
1192 		if ((h = calloc(1, sizeof(*h))) == NULL)
1193 			fatal("calloc");
1194 
1195 		if (port)
1196 			h->port = port;
1197 		if (ifname != NULL) {
1198 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1199 			    sizeof(h->ifname)) {
1200 				log_warnx("%s: interface name truncated",
1201 				    __func__);
1202 				free(h);
1203 				freeifaddrs(ifap);
1204 				return (-1);
1205 			}
1206 		}
1207 		if (ipproto != -1)
1208 			h->ipproto = ipproto;
1209 		h->ss.ss_family = af;
1210 		h->prefixlen = -1; /* host address */
1211 
1212 		if (af == AF_INET) {
1213 			struct sockaddr_in *ra;
1214 			sain = (struct sockaddr_in *)&h->ss;
1215 			ra = (struct sockaddr_in *)p->ifa_addr;
1216 			got_sockaddr_inet_init(sain, &ra->sin_addr);
1217 		} else {
1218 			struct sockaddr_in6 *ra;
1219 			sin6 = (struct sockaddr_in6 *)&h->ss;
1220 			ra = (struct sockaddr_in6 *)p->ifa_addr;
1221 			got_sockaddr_inet6_init(sin6, &ra->sin6_addr,
1222 			    ra->sin6_scope_id);
1223 		}
1224 
1225 		TAILQ_INSERT_HEAD(al, h, entry);
1226 		cnt++;
1227 	}
1228 	if (af == AF_INET) {
1229 		/* Next search for IPv6 addresses */
1230 		af = AF_INET6;
1231 		goto nextaf;
1232 	}
1233 
1234 	if (cnt > max) {
1235 		log_warnx("%s: %s resolves to more than %d hosts", __func__,
1236 		    s, max);
1237 	}
1238 	freeifaddrs(ifap);
1239 	return (cnt);
1240 }
1241 
1242 int
1243 host(const char *s, struct addresslist *al, int max,
1244     in_port_t port, const char *ifname, int ipproto)
1245 {
1246 	struct address *h;
1247 
1248 	h = host_v4(s);
1249 
1250 	/* IPv6 address? */
1251 	if (h == NULL)
1252 		h = host_v6(s);
1253 
1254 	if (h != NULL) {
1255 		if (port)
1256 			h->port = port;
1257 		if (ifname != NULL) {
1258 			if (strlcpy(h->ifname, ifname, sizeof(h->ifname)) >=
1259 			    sizeof(h->ifname)) {
1260 				log_warnx("%s: interface name truncated",
1261 				    __func__);
1262 				free(h);
1263 				return (-1);
1264 			}
1265 		}
1266 		if (ipproto != -1)
1267 			h->ipproto = ipproto;
1268 
1269 		TAILQ_INSERT_HEAD(al, h, entry);
1270 		return (1);
1271 	}
1272 
1273 	return (host_dns(s, al, max, port, ifname, ipproto));
1274 }
1275 
1276 int
1277 is_if_in_group(const char *ifname, const char *groupname)
1278 {
1279 /* TA: Check this... */
1280 #ifdef HAVE_STRUCT_IFGROUPREQ
1281 	unsigned int len;
1282 	struct ifgroupreq ifgr;
1283 	struct ifg_req *ifg;
1284 	int s;
1285 	int ret = 0;
1286 
1287 	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
1288 		err(1, "socket");
1289 
1290 	memset(&ifgr, 0, sizeof(ifgr));
1291 	if (strlcpy(ifgr.ifgr_name, ifname, IFNAMSIZ) >= IFNAMSIZ)
1292 		err(1, "IFNAMSIZ");
1293 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1) {
1294 		if (errno == EINVAL || errno == ENOTTY)
1295 			goto end;
1296 		err(1, "SIOCGIFGROUP");
1297 	}
1298 
1299 	len = ifgr.ifgr_len;
1300 	ifgr.ifgr_groups = calloc(len / sizeof(struct ifg_req),
1301 	    sizeof(struct ifg_req));
1302 	if (ifgr.ifgr_groups == NULL)
1303 		err(1, "getifgroups");
1304 	if (ioctl(s, SIOCGIFGROUP, (caddr_t)&ifgr) == -1)
1305 		err(1, "SIOCGIFGROUP");
1306 
1307 	ifg = ifgr.ifgr_groups;
1308 	for (; ifg && len >= sizeof(struct ifg_req); ifg++) {
1309 		len -= sizeof(struct ifg_req);
1310 		if (strcmp(ifg->ifgrq_group, groupname) == 0) {
1311 			ret = 1;
1312 			break;
1313 		}
1314 	}
1315 	free(ifgr.ifgr_groups);
1316 
1317 end:
1318 	close(s);
1319 	return (ret);
1320 #else
1321 	return (0);
1322 #endif
1323 }
1324 
1325 int
1326 get_addrs(const char *addr, struct addresslist *al, in_port_t port)
1327 {
1328 	if (strcmp("", addr) == 0) {
1329 		if (host("0.0.0.0", al, 1, port, "0.0.0.0", -1) <= 0) {
1330 			yyerror("invalid listen ip: %s",
1331 			    "0.0.0.0");
1332 			return (-1);
1333 		}
1334 		if (host("::", al, 1, port, "::", -1) <= 0) {
1335 			yyerror("invalid listen ip: %s", "::");
1336 			return (-1);
1337 		}
1338 	} else {
1339 		if (host(addr, al, GOTWEBD_MAXIFACE, port, addr,
1340 		    -1) <= 0) {
1341 			yyerror("invalid listen ip: %s", addr);
1342 			return (-1);
1343 		}
1344 	}
1345 	return (0);
1346 }