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