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