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 #include <sys/un.h>
30 
31 #include <net/if.h>
32 #include <netinet/in.h>
33 
34 #include <arpa/inet.h>
35 
36 #include <ctype.h>
37 #include <err.h>
38 #include <errno.h>
39 #include <event.h>
40 #include <ifaddrs.h>
41 #include <imsg.h>
42 #include <limits.h>
43 #include <netdb.h>
44 #include <stdarg.h>
45 #include <stdlib.h>
46 #include <stdio.h>
47 #include <string.h>
48 #include <syslog.h>
49 #include <unistd.h>
50 
51 #include "got_reference.h"
52 
53 #include "gotwebd.h"
54 
55 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
56 static struct file {
57 	TAILQ_ENTRY(file)	 entry;
58 	FILE			*stream;
59 	char			*name;
60 	int			 lineno;
61 	int			 errors;
62 } *file;
63 struct file	*newfile(const char *, int);
64 static void	 closefile(struct file *);
65 int		 check_file_secrecy(int, const char *);
66 int		 yyparse(void);
67 int		 yylex(void);
68 int		 yyerror(const char *, ...)
69     __attribute__((__format__ (printf, 1, 2)))
70     __attribute__((__nonnull__ (1)));
71 int		 kw_cmp(const void *, const void *);
72 int		 lookup(char *);
73 int		 lgetc(int);
74 int		 lungetc(int);
75 int		 findeol(void);
76 
77 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
78 struct sym {
79 	TAILQ_ENTRY(sym)	 entry;
80 	int			 used;
81 	int			 persist;
82 	char			*nam;
83 	char			*val;
84 };
85 
86 int	 symset(const char *, const char *, int);
87 char	*symget(const char *);
88 
89 static int		 errors;
90 
91 static struct gotwebd		*gotwebd;
92 static struct server		*new_srv;
93 static struct server		*conf_new_server(const char *);
94 int				 getservice(const char *);
95 int				 n;
96 
97 int		 get_addrs(const char *, const char *, struct server *);
98 int		 get_unix_addr(const char *, struct server *);
99 int		 addr_dup_check(struct addresslist *, struct address *);
100 int		 add_addr(struct server *, struct address *);
101 
102 typedef struct {
103 	union {
104 		long long	 number;
105 		char		*string;
106 	} v;
107 	int lineno;
108 } YYSTYPE;
109 
110 %}
111 
112 %token	LISTEN WWW_PATH SITE_NAME SITE_OWNER SITE_LINK LOGO
113 %token	LOGO_URL SHOW_REPO_OWNER SHOW_REPO_AGE SHOW_REPO_DESCRIPTION
114 %token	MAX_REPOS_DISPLAY REPOS_PATH MAX_COMMITS_DISPLAY ON ERROR
115 %token	SHOW_SITE_OWNER SHOW_REPO_CLONEURL PORT PREFORK RESPECT_EXPORTOK
116 %token	UNIX_SOCKET_NAME SERVER CHROOT CUSTOM_CSS SOCKET
117 %token	SUMMARY_COMMITS_DISPLAY SUMMARY_TAGS_DISPLAY
118 
119 %token	<v.string>	STRING
120 %token	<v.number>	NUMBER
121 %type	<v.number>	boolean
122 %type	<v.string>	listen_addr
123 
124 %%
125 
126 grammar		: /* empty */
127 		| grammar '\n'
128 		| grammar varset '\n'
129 		| grammar main '\n'
130 		| grammar server '\n'
131 		| grammar error '\n'		{ file->errors++; }
132 		;
133 
134 varset		: STRING '=' STRING	{
135 			char *s = $1;
136 			while (*s++) {
137 				if (isspace((unsigned char)*s)) {
138 					yyerror("macro name cannot contain "
139 					    "whitespace");
140 					free($1);
141 					free($3);
142 					YYERROR;
143 				}
144 			}
145 			if (symset($1, $3, 0) == -1)
146 				fatal("cannot store variable");
147 			free($1);
148 			free($3);
149 		}
150 		;
151 
152 boolean		: STRING {
153 			if (strcasecmp($1, "1") == 0 ||
154 			    strcasecmp($1, "on") == 0)
155 				$$ = 1;
156 			else if (strcasecmp($1, "0") == 0 ||
157 			    strcasecmp($1, "off") == 0)
158 				$$ = 0;
159 			else {
160 				yyerror("invalid boolean value '%s'", $1);
161 				free($1);
162 				YYERROR;
163 			}
164 			free($1);
165 		}
166 		| ON { $$ = 1; }
167 		| NUMBER {
168 			if ($1 != 0 && $1 != 1) {
169 				yyerror("invalid boolean value '%lld'", $1);
170 				YYERROR;
171 			}
172 			$$ = $1;
173 		}
174 		;
175 
176 listen_addr	: '*' { $$ = NULL; }
177 		| STRING
178 		;
179 
180 main		: PREFORK NUMBER {
181 			if ($2 <= 0 || $2 > PROC_MAX_INSTANCES) {
182 				yyerror("prefork is %s: %lld",
183 				    $2 <= 0 ? "too small" : "too large", $2);
184 				YYERROR;
185 			}
186 			gotwebd->prefork_gotwebd = $2;
187 		}
188 		| CHROOT STRING {
189 			if (*$2 == '\0') {
190 				yyerror("chroot path can't be an empty"
191 				    " string");
192 				free($2);
193 				YYERROR;
194 			}
195 
196 			n = strlcpy(gotwebd->httpd_chroot, $2,
197 			    sizeof(gotwebd->httpd_chroot));
198 			if (n >= sizeof(gotwebd->httpd_chroot)) {
199 				yyerror("%s: httpd_chroot truncated", __func__);
200 				free($2);
201 				YYERROR;
202 			}
203 			free($2);
204 		}
205 		| UNIX_SOCKET_NAME STRING {
206 			n = snprintf(gotwebd->unix_socket_name,
207 			    sizeof(gotwebd->unix_socket_name), "%s%s",
208 			    gotwebd->httpd_chroot, $2);
209 			if (n < 0 ||
210 			    (size_t)n >= sizeof(gotwebd->unix_socket_name)) {
211 				yyerror("%s: unix_socket_name truncated",
212 				    __func__);
213 				free($2);
214 				YYERROR;
215 			}
216 			free($2);
217 		}
218 		;
219 
220 server		: SERVER STRING {
221 			struct server *srv;
222 
223 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
224 				if (strcmp(srv->name, $2) == 0) {
225 					yyerror("server name exists '%s'", $2);
226 					free($2);
227 					YYERROR;
228 				}
229 			}
230 
231 			new_srv = conf_new_server($2);
232 			log_debug("adding server %s", $2);
233 			free($2);
234 		}
235 		| SERVER STRING {
236 			struct server *srv;
237 
238 			TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
239 				if (strcmp(srv->name, $2) == 0) {
240 					yyerror("server name exists '%s'", $2);
241 					free($2);
242 					YYERROR;
243 				}
244 			}
245 
246 			new_srv = conf_new_server($2);
247 			log_debug("adding server %s", $2);
248 			free($2);
249 		} '{' optnl serveropts2 '}' {
250 		}
251 		;
252 
253 serveropts1	: REPOS_PATH STRING {
254 			n = strlcpy(new_srv->repos_path, $2,
255 			    sizeof(new_srv->repos_path));
256 			if (n >= sizeof(new_srv->repos_path)) {
257 				yyerror("%s: repos_path truncated", __func__);
258 				free($2);
259 				YYERROR;
260 			}
261 			free($2);
262 		}
263 		| SITE_NAME STRING {
264 			n = strlcpy(new_srv->site_name, $2,
265 			    sizeof(new_srv->site_name));
266 			if (n >= sizeof(new_srv->site_name)) {
267 				yyerror("%s: site_name truncated", __func__);
268 				free($2);
269 				YYERROR;
270 			}
271 			free($2);
272 		}
273 		| SITE_OWNER STRING {
274 			n = strlcpy(new_srv->site_owner, $2,
275 			    sizeof(new_srv->site_owner));
276 			if (n >= sizeof(new_srv->site_owner)) {
277 				yyerror("%s: site_owner truncated", __func__);
278 				free($2);
279 				YYERROR;
280 			}
281 			free($2);
282 		}
283 		| SITE_LINK STRING {
284 			n = strlcpy(new_srv->site_link, $2,
285 			    sizeof(new_srv->site_link));
286 			if (n >= sizeof(new_srv->site_link)) {
287 				yyerror("%s: site_link truncated", __func__);
288 				free($2);
289 				YYERROR;
290 			}
291 			free($2);
292 		}
293 		| LOGO STRING {
294 			n = strlcpy(new_srv->logo, $2, sizeof(new_srv->logo));
295 			if (n >= sizeof(new_srv->logo)) {
296 				yyerror("%s: logo truncated", __func__);
297 				free($2);
298 				YYERROR;
299 			}
300 			free($2);
301 		}
302 		| LOGO_URL STRING {
303 			n = strlcpy(new_srv->logo_url, $2,
304 			    sizeof(new_srv->logo_url));
305 			if (n >= sizeof(new_srv->logo_url)) {
306 				yyerror("%s: logo_url truncated", __func__);
307 				free($2);
308 				YYERROR;
309 			}
310 			free($2);
311 		}
312 		| CUSTOM_CSS STRING {
313 			n = strlcpy(new_srv->custom_css, $2,
314 			    sizeof(new_srv->custom_css));
315 			if (n >= sizeof(new_srv->custom_css)) {
316 				yyerror("%s: custom_css truncated", __func__);
317 				free($2);
318 				YYERROR;
319 			}
320 			free($2);
321 		}
322 		| LISTEN ON listen_addr PORT STRING {
323 			if (get_addrs($3, $5, new_srv) == -1) {
324 				yyerror("could not get addrs");
325 				YYERROR;
326 			}
327 			free($3);
328 			free($5);
329 		}
330 		| LISTEN ON listen_addr PORT NUMBER {
331 			char portno[32];
332 			int n;
333 
334 			n = snprintf(portno, sizeof(portno), "%lld",
335 			    (long long)$5);
336 			if (n < 0 || (size_t)n >= sizeof(portno))
337 				fatalx("port number too long: %lld",
338 				    (long long)$5);
339 
340 			if (get_addrs($3, portno, new_srv) == -1) {
341 				yyerror("could not get addrs");
342 				YYERROR;
343 			}
344 			free($3);
345 		}
346 		| LISTEN ON SOCKET STRING {
347 			if (get_unix_addr($4, new_srv) == -1) {
348 				yyerror("can't listen on %s", $4);
349 				free($4);
350 				YYERROR;
351 			}
352 			free($4);
353 		}
354 		| SHOW_SITE_OWNER boolean {
355 			new_srv->show_site_owner = $2;
356 		}
357 		| SHOW_REPO_OWNER boolean {
358 			new_srv->show_repo_owner = $2;
359 		}
360 		| SHOW_REPO_AGE boolean {
361 			new_srv->show_repo_age = $2;
362 		}
363 		| SHOW_REPO_DESCRIPTION boolean {
364 			new_srv->show_repo_description = $2;
365 		}
366 		| SHOW_REPO_CLONEURL boolean {
367 			new_srv->show_repo_cloneurl = $2;
368 		}
369 		| RESPECT_EXPORTOK boolean {
370 			new_srv->respect_exportok = $2;
371 		}
372 		| MAX_REPOS_DISPLAY NUMBER {
373 			if ($2 < 0) {
374 				yyerror("max_repos_display is too small: %lld",
375 				    $2);
376 				YYERROR;
377 			}
378 			new_srv->max_repos_display = $2;
379 		}
380 		| MAX_COMMITS_DISPLAY NUMBER {
381 			if ($2 <= 1) {
382 				yyerror("max_commits_display is too small:"
383 				    " %lld", $2);
384 				YYERROR;
385 			}
386 			new_srv->max_commits_display = $2;
387 		}
388 		| SUMMARY_COMMITS_DISPLAY NUMBER {
389 			if ($2 < 1) {
390 				yyerror("summary_commits_display is too small:"
391 				    " %lld", $2);
392 				YYERROR;
393 			}
394 			new_srv->summary_commits_display = $2;
395 		}
396 		| SUMMARY_TAGS_DISPLAY NUMBER {
397 			if ($2 < 1) {
398 				yyerror("summary_tags_display is too small:"
399 				    " %lld", $2);
400 				YYERROR;
401 			}
402 			new_srv->summary_tags_display = $2;
403 		}
404 		;
405 
406 serveropts2	: serveropts2 serveropts1 nl
407 		| serveropts1 optnl
408 		;
409 
410 nl		: '\n' optnl
411 		;
412 
413 optnl		: '\n' optnl		/* zero or more newlines */
414 		| /* empty */
415 		;
416 
417 %%
418 
419 struct keywords {
420 	const char	*k_name;
421 	int		 k_val;
422 };
423 
424 int
425 yyerror(const char *fmt, ...)
426 {
427 	va_list ap;
428 	char *msg;
429 
430 	file->errors++;
431 	va_start(ap, fmt);
432 	if (vasprintf(&msg, fmt, ap) == -1)
433 		fatalx("yyerror vasprintf");
434 	va_end(ap);
435 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
436 	free(msg);
437 	return (0);
438 }
439 
440 int
441 kw_cmp(const void *k, const void *e)
442 {
443 	return (strcmp(k, ((const struct keywords *)e)->k_name));
444 }
445 
446 int
447 lookup(char *s)
448 {
449 	/* This has to be sorted always. */
450 	static const struct keywords keywords[] = {
451 		{ "chroot",			CHROOT },
452 		{ "custom_css",			CUSTOM_CSS },
453 		{ "listen",			LISTEN },
454 		{ "logo",			LOGO },
455 		{ "logo_url",			LOGO_URL },
456 		{ "max_commits_display",	MAX_COMMITS_DISPLAY },
457 		{ "max_repos_display",		MAX_REPOS_DISPLAY },
458 		{ "on",				ON },
459 		{ "port",			PORT },
460 		{ "prefork",			PREFORK },
461 		{ "repos_path",			REPOS_PATH },
462 		{ "respect_exportok",		RESPECT_EXPORTOK },
463 		{ "server",			SERVER },
464 		{ "show_repo_age",		SHOW_REPO_AGE },
465 		{ "show_repo_cloneurl",		SHOW_REPO_CLONEURL },
466 		{ "show_repo_description",	SHOW_REPO_DESCRIPTION },
467 		{ "show_repo_owner",		SHOW_REPO_OWNER },
468 		{ "show_site_owner",		SHOW_SITE_OWNER },
469 		{ "site_link",			SITE_LINK },
470 		{ "site_name",			SITE_NAME },
471 		{ "site_owner",			SITE_OWNER },
472 		{ "socket",			SOCKET },
473 		{ "summary_commits_display",	SUMMARY_COMMITS_DISPLAY },
474 		{ "summary_tags_display",	SUMMARY_TAGS_DISPLAY },
475 		{ "unix_socket_name",		UNIX_SOCKET_NAME },
476 	};
477 	const struct keywords *p;
478 
479 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
480 	    sizeof(keywords[0]), kw_cmp);
481 
482 	if (p)
483 		return (p->k_val);
484 	else
485 		return (STRING);
486 }
487 
488 #define MAXPUSHBACK	128
489 
490 unsigned char *parsebuf;
491 int parseindex;
492 unsigned char pushback_buffer[MAXPUSHBACK];
493 int pushback_index = 0;
494 
495 int
496 lgetc(int quotec)
497 {
498 	int c, next;
499 
500 	if (parsebuf) {
501 		/* Read character from the parsebuffer instead of input. */
502 		if (parseindex >= 0) {
503 			c = parsebuf[parseindex++];
504 			if (c != '\0')
505 				return (c);
506 			parsebuf = NULL;
507 		} else
508 			parseindex++;
509 	}
510 
511 	if (pushback_index)
512 		return (pushback_buffer[--pushback_index]);
513 
514 	if (quotec) {
515 		c = getc(file->stream);
516 		if (c == EOF)
517 			yyerror("reached end of file while parsing "
518 			    "quoted string");
519 		return (c);
520 	}
521 
522 	c = getc(file->stream);
523 	while (c == '\\') {
524 		next = getc(file->stream);
525 		if (next != '\n') {
526 			c = next;
527 			break;
528 		}
529 		yylval.lineno = file->lineno;
530 		file->lineno++;
531 		c = getc(file->stream);
532 	}
533 
534 	return (c);
535 }
536 
537 int
538 lungetc(int c)
539 {
540 	if (c == EOF)
541 		return (EOF);
542 	if (parsebuf) {
543 		parseindex--;
544 		if (parseindex >= 0)
545 			return (c);
546 	}
547 	if (pushback_index < MAXPUSHBACK-1)
548 		return (pushback_buffer[pushback_index++] = c);
549 	else
550 		return (EOF);
551 }
552 
553 int
554 findeol(void)
555 {
556 	int c;
557 
558 	parsebuf = NULL;
559 
560 	/* Skip to either EOF or the first real EOL. */
561 	while (1) {
562 		if (pushback_index)
563 			c = pushback_buffer[--pushback_index];
564 		else
565 			c = lgetc(0);
566 		if (c == '\n') {
567 			file->lineno++;
568 			break;
569 		}
570 		if (c == EOF)
571 			break;
572 	}
573 	return (ERROR);
574 }
575 
576 int
577 yylex(void)
578 {
579 	unsigned char buf[8096];
580 	unsigned char *p, *val;
581 	int quotec, next, c;
582 	int token;
583 
584 top:
585 	p = buf;
586 	c = lgetc(0);
587 	while (c == ' ' || c == '\t')
588 		c = lgetc(0); /* nothing */
589 
590 	yylval.lineno = file->lineno;
591 	if (c == '#') {
592 		c = lgetc(0);
593 		while (c != '\n' && c != EOF)
594 			c = lgetc(0); /* nothing */
595 	}
596 	if (c == '$' && parsebuf == NULL) {
597 		while (1) {
598 			c = lgetc(0);
599 			if (c == EOF)
600 				return (0);
601 
602 			if (p + 1 >= buf + sizeof(buf) - 1) {
603 				yyerror("string too long");
604 				return (findeol());
605 			}
606 			if (isalnum(c) || c == '_') {
607 				*p++ = c;
608 				continue;
609 			}
610 			*p = '\0';
611 			lungetc(c);
612 			break;
613 		}
614 		val = symget(buf);
615 		if (val == NULL) {
616 			yyerror("macro '%s' not defined", buf);
617 			return (findeol());
618 		}
619 		parsebuf = val;
620 		parseindex = 0;
621 		goto top;
622 	}
623 
624 	switch (c) {
625 	case '\'':
626 	case '"':
627 		quotec = c;
628 		while (1) {
629 			c = lgetc(quotec);
630 			if (c == EOF)
631 				return (0);
632 			if (c == '\n') {
633 				file->lineno++;
634 				continue;
635 			} else if (c == '\\') {
636 				next = lgetc(quotec);
637 				if (next == EOF)
638 					return (0);
639 				if (next == quotec || c == ' ' || c == '\t')
640 					c = next;
641 				else if (next == '\n') {
642 					file->lineno++;
643 					continue;
644 				} else
645 					lungetc(next);
646 			} else if (c == quotec) {
647 				*p = '\0';
648 				break;
649 			} else if (c == '\0') {
650 				yyerror("syntax error");
651 				return (findeol());
652 			}
653 			if (p + 1 >= buf + sizeof(buf) - 1) {
654 				yyerror("string too long");
655 				return (findeol());
656 			}
657 			*p++ = c;
658 		}
659 		yylval.v.string = strdup(buf);
660 		if (yylval.v.string == NULL)
661 			err(1, "yylex: strdup");
662 		return (STRING);
663 	}
664 
665 #define allowed_to_end_number(x) \
666 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
667 
668 	if (c == '-' || isdigit(c)) {
669 		do {
670 			*p++ = c;
671 			if ((unsigned)(p-buf) >= sizeof(buf)) {
672 				yyerror("string too long");
673 				return (findeol());
674 			}
675 			c = lgetc(0);
676 		} while (c != EOF && isdigit(c));
677 		lungetc(c);
678 		if (p == buf + 1 && buf[0] == '-')
679 			goto nodigits;
680 		if (c == EOF || allowed_to_end_number(c)) {
681 			const char *errstr = NULL;
682 
683 			*p = '\0';
684 			yylval.v.number = strtonum(buf, LLONG_MIN,
685 			    LLONG_MAX, &errstr);
686 			if (errstr) {
687 				yyerror("\"%s\" invalid number: %s",
688 				    buf, errstr);
689 				return (findeol());
690 			}
691 			return (NUMBER);
692 		} else {
693 nodigits:
694 			while (p > buf + 1)
695 				lungetc(*--p);
696 			c = *--p;
697 			if (c == '-')
698 				return (c);
699 		}
700 	}
701 
702 #define allowed_in_string(x) \
703 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
704 	x != '{' && x != '}' && \
705 	x != '!' && x != '=' && x != '#' && \
706 	x != ','))
707 
708 	if (isalnum(c) || c == ':' || c == '_') {
709 		do {
710 			*p++ = c;
711 			if ((unsigned)(p-buf) >= sizeof(buf)) {
712 				yyerror("string too long");
713 				return (findeol());
714 			}
715 			c = lgetc(0);
716 		} while (c != EOF && (allowed_in_string(c)));
717 		lungetc(c);
718 		*p = '\0';
719 		token = lookup(buf);
720 		if (token == STRING) {
721 			yylval.v.string = strdup(buf);
722 			if (yylval.v.string == NULL)
723 				err(1, "yylex: strdup");
724 		}
725 		return (token);
726 	}
727 	if (c == '\n') {
728 		yylval.lineno = file->lineno;
729 		file->lineno++;
730 	}
731 	if (c == EOF)
732 		return (0);
733 	return (c);
734 }
735 
736 int
737 check_file_secrecy(int fd, const char *fname)
738 {
739 	struct stat st;
740 
741 	if (fstat(fd, &st)) {
742 		log_warn("cannot stat %s", fname);
743 		return (-1);
744 	}
745 	if (st.st_uid != 0 && st.st_uid != getuid()) {
746 		log_warnx("%s: owner not root or current user", fname);
747 		return (-1);
748 	}
749 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
750 		log_warnx("%s: group writable or world read/writable", fname);
751 		return (-1);
752 	}
753 	return (0);
754 }
755 
756 struct file *
757 newfile(const char *name, int secret)
758 {
759 	struct file *nfile;
760 
761 	nfile = calloc(1, sizeof(struct file));
762 	if (nfile == NULL) {
763 		log_warn("calloc");
764 		return (NULL);
765 	}
766 	nfile->name = strdup(name);
767 	if (nfile->name == NULL) {
768 		log_warn("strdup");
769 		free(nfile);
770 		return (NULL);
771 	}
772 	nfile->stream = fopen(nfile->name, "r");
773 	if (nfile->stream == NULL) {
774 		/* no warning, we don't require a conf file */
775 		free(nfile->name);
776 		free(nfile);
777 		return (NULL);
778 	} else if (secret &&
779 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
780 		fclose(nfile->stream);
781 		free(nfile->name);
782 		free(nfile);
783 		return (NULL);
784 	}
785 	nfile->lineno = 1;
786 	return (nfile);
787 }
788 
789 static void
790 closefile(struct file *xfile)
791 {
792 	fclose(xfile->stream);
793 	free(xfile->name);
794 	free(xfile);
795 }
796 
797 static void
798 add_default_server(void)
799 {
800 	new_srv = conf_new_server(D_SITENAME);
801 	log_debug("%s: adding default server %s", __func__, D_SITENAME);
802 }
803 
804 int
805 parse_config(const char *filename, struct gotwebd *env)
806 {
807 	struct sym *sym, *next;
808 	struct server *srv;
809 	int n;
810 
811 	if (config_init(env) == -1)
812 		fatalx("failed to initialize configuration");
813 
814 	gotwebd = env;
815 
816 	n = snprintf(env->unix_socket_name, sizeof(env->unix_socket_name),
817 	    "%s%s", D_HTTPD_CHROOT, D_UNIX_SOCKET);
818 	if (n < 0 || (size_t)n >= sizeof(env->unix_socket_name))
819 		fatalx("%s: snprintf", __func__);
820 
821 	file = newfile(filename, 0);
822 	if (file == NULL) {
823 		add_default_server();
824 		sockets_parse_sockets(env);
825 		/* just return, as we don't require a conf file */
826 		return (0);
827 	}
828 
829 	yyparse();
830 	errors = file->errors;
831 	closefile(file);
832 
833 	/* Free macros and check which have not been used. */
834 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
835 		if ((gotwebd->gotwebd_verbose > 1) && !sym->used)
836 			fprintf(stderr, "warning: macro '%s' not used\n",
837 			    sym->nam);
838 		if (!sym->persist) {
839 			free(sym->nam);
840 			free(sym->val);
841 			TAILQ_REMOVE(&symhead, sym, entry);
842 			free(sym);
843 		}
844 	}
845 
846 	/* just add default server if no config specified */
847 	if (gotwebd->server_cnt == 0)
848 		add_default_server();
849 
850 	/* add the implicit listen on socket where missing */
851 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
852 		if (!TAILQ_EMPTY(&srv->al))
853 			continue;
854 		if (get_unix_addr(env->unix_socket_name, srv) == -1)
855 			yyerror("can't listen on %s", env->unix_socket_name);
856 	}
857 
858 	if (errors)
859 		return (-1);
860 
861 	/* setup our listening sockets */
862 	sockets_parse_sockets(env);
863 
864 	return (0);
865 }
866 
867 struct server *
868 conf_new_server(const char *name)
869 {
870 	struct server *srv = NULL;
871 
872 	srv = calloc(1, sizeof(*srv));
873 	if (srv == NULL)
874 		fatalx("%s: calloc", __func__);
875 
876 	n = strlcpy(srv->name, name, sizeof(srv->name));
877 	if (n >= sizeof(srv->name))
878 		fatalx("%s: strlcpy", __func__);
879 	n = strlcpy(srv->repos_path, D_GOTPATH,
880 	    sizeof(srv->repos_path));
881 	if (n >= sizeof(srv->repos_path))
882 		fatalx("%s: strlcpy", __func__);
883 	n = strlcpy(srv->site_name, D_SITENAME,
884 	    sizeof(srv->site_name));
885 	if (n >= sizeof(srv->site_name))
886 		fatalx("%s: strlcpy", __func__);
887 	n = strlcpy(srv->site_owner, D_SITEOWNER,
888 	    sizeof(srv->site_owner));
889 	if (n >= sizeof(srv->site_owner))
890 		fatalx("%s: strlcpy", __func__);
891 	n = strlcpy(srv->site_link, D_SITELINK,
892 	    sizeof(srv->site_link));
893 	if (n >= sizeof(srv->site_link))
894 		fatalx("%s: strlcpy", __func__);
895 	n = strlcpy(srv->logo, D_GOTLOGO,
896 	    sizeof(srv->logo));
897 	if (n >= sizeof(srv->logo))
898 		fatalx("%s: strlcpy", __func__);
899 	n = strlcpy(srv->logo_url, D_GOTURL, sizeof(srv->logo_url));
900 	if (n >= sizeof(srv->logo_url))
901 		fatalx("%s: strlcpy", __func__);
902 	n = strlcpy(srv->custom_css, D_GOTWEBCSS, sizeof(srv->custom_css));
903 	if (n >= sizeof(srv->custom_css))
904 		fatalx("%s: strlcpy", __func__);
905 
906 	srv->show_site_owner = D_SHOWSOWNER;
907 	srv->show_repo_owner = D_SHOWROWNER;
908 	srv->show_repo_age = D_SHOWAGE;
909 	srv->show_repo_description = D_SHOWDESC;
910 	srv->show_repo_cloneurl = D_SHOWURL;
911 	srv->respect_exportok = D_RESPECTEXPORTOK;
912 
913 	srv->max_repos_display = D_MAXREPODISP;
914 	srv->max_commits_display = D_MAXCOMMITDISP;
915 	srv->summary_commits_display = D_MAXSLCOMMDISP;
916 	srv->summary_tags_display = D_MAXSLTAGDISP;
917 
918 	TAILQ_INIT(&srv->al);
919 	TAILQ_INSERT_TAIL(&gotwebd->servers, srv, entry);
920 	gotwebd->server_cnt++;
921 
922 	return srv;
923 };
924 
925 int
926 symset(const char *nam, const char *val, int persist)
927 {
928 	struct sym *sym;
929 
930 	TAILQ_FOREACH(sym, &symhead, entry) {
931 		if (strcmp(nam, sym->nam) == 0)
932 			break;
933 	}
934 
935 	if (sym != NULL) {
936 		if (sym->persist == 1)
937 			return (0);
938 		else {
939 			free(sym->nam);
940 			free(sym->val);
941 			TAILQ_REMOVE(&symhead, sym, entry);
942 			free(sym);
943 		}
944 	}
945 	sym = calloc(1, sizeof(*sym));
946 	if (sym == NULL)
947 		return (-1);
948 
949 	sym->nam = strdup(nam);
950 	if (sym->nam == NULL) {
951 		free(sym);
952 		return (-1);
953 	}
954 	sym->val = strdup(val);
955 	if (sym->val == NULL) {
956 		free(sym->nam);
957 		free(sym);
958 		return (-1);
959 	}
960 	sym->used = 0;
961 	sym->persist = persist;
962 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
963 	return (0);
964 }
965 
966 int
967 cmdline_symset(char *s)
968 {
969 	char *sym, *val;
970 	int ret;
971 
972 	val = strrchr(s, '=');
973 	if (val == NULL)
974 		return (-1);
975 
976 	sym = strndup(s, val - s);
977 	if (sym == NULL)
978 		fatal("%s: strndup", __func__);
979 
980 	ret = symset(sym, val + 1, 1);
981 	free(sym);
982 
983 	return (ret);
984 }
985 
986 char *
987 symget(const char *nam)
988 {
989 	struct sym *sym;
990 
991 	TAILQ_FOREACH(sym, &symhead, entry) {
992 		if (strcmp(nam, sym->nam) == 0) {
993 			sym->used = 1;
994 			return (sym->val);
995 		}
996 	}
997 	return (NULL);
998 }
999 
1000 int
1001 get_addrs(const char *hostname, const char *servname, struct server *new_srv)
1002 {
1003 	struct addrinfo hints, *res0, *res;
1004 	int error;
1005 	struct sockaddr_in *sin;
1006 	struct sockaddr_in6 *sin6;
1007 	struct address *h;
1008 
1009 	memset(&hints, 0, sizeof(hints));
1010 	hints.ai_family = AF_UNSPEC;
1011 	hints.ai_socktype = SOCK_STREAM;
1012 	hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
1013 	error = getaddrinfo(hostname, servname, &hints, &res0);
1014 	if (error) {
1015 		log_warnx("%s: could not parse \"%s:%s\": %s", __func__,
1016 		    hostname, servname, gai_strerror(error));
1017 		return (-1);
1018 	}
1019 
1020 	for (res = res0; res; res = res->ai_next) {
1021 		if ((h = calloc(1, sizeof(*h))) == NULL)
1022 			fatal(__func__);
1023 
1024 		if (hostname == NULL) {
1025 			strlcpy(h->ifname, "*", sizeof(h->ifname));
1026 		} else {
1027 			if (strlcpy(h->ifname, hostname, sizeof(h->ifname)) >=
1028 			    sizeof(h->ifname)) {
1029 				log_warnx("%s: address truncated: %s",
1030 				    __func__, hostname);
1031 				freeaddrinfo(res0);
1032 				free(h);
1033 				return (-1);
1034 			}
1035 		}
1036 
1037 		h->ai_family = res->ai_family;
1038 		h->ai_socktype = res->ai_socktype;
1039 		h->ai_protocol = res->ai_protocol;
1040 		memcpy(&h->ss, res->ai_addr, res->ai_addrlen);
1041 		h->slen = res->ai_addrlen;
1042 
1043 		switch (res->ai_family) {
1044 		case AF_INET:
1045 			sin = (struct sockaddr_in *)res->ai_addr;
1046 			h->port = ntohs(sin->sin_port);
1047 			break;
1048 		case AF_INET6:
1049 			sin6 = (struct sockaddr_in6 *)res->ai_addr;
1050 			h->port = ntohs(sin6->sin6_port);
1051 			break;
1052 		default:
1053 			fatalx("unknown address family %d", res->ai_family);
1054 		}
1055 
1056 		if (add_addr(new_srv, h) == -1) {
1057 			freeaddrinfo(res0);
1058 			return -1;
1059 		}
1060 	}
1061 	freeaddrinfo(res0);
1062 	return (0);
1063 }
1064 
1065 int
1066 get_unix_addr(const char *path, struct server *new_srv)
1067 {
1068 	struct address *h;
1069 	struct sockaddr_un *sun;
1070 
1071 	if ((h = calloc(1, sizeof(*h))) == NULL)
1072 		fatal("%s: calloc", __func__);
1073 
1074 	h->ai_family = AF_UNIX;
1075 	h->ai_socktype = SOCK_STREAM;
1076 	h->ai_protocol = PF_UNSPEC;
1077 	h->slen = sizeof(*sun);
1078 
1079 	sun = (struct sockaddr_un *)&h->ss;
1080 	sun->sun_family = AF_UNIX;
1081 	if (strlcpy(sun->sun_path, path, sizeof(sun->sun_path)) >=
1082 	    sizeof(sun->sun_path)) {
1083 		log_warnx("socket path too long: %s", sun->sun_path);
1084 		return (-1);
1085 	}
1086 
1087 	return add_addr(new_srv, h);
1088 }
1089 
1090 int
1091 addr_dup_check(struct addresslist *al, struct address *h)
1092 {
1093 	struct address *a;
1094 
1095 	TAILQ_FOREACH(a, al, entry) {
1096 		if (a->ai_family != h->ai_family ||
1097 		    a->ai_socktype != h->ai_socktype ||
1098 		    a->ai_protocol != h->ai_protocol ||
1099 		    a->slen != h->slen ||
1100 		    memcmp(&a->ss, &h->ss, a->slen) != 0)
1101 			continue;
1102 		return -1;
1103 	}
1104 
1105 	return 0;
1106 }
1107 
1108 int
1109 add_addr(struct server *new_srv, struct address *h)
1110 {
1111 	struct server *srv;
1112 	struct address *dup;
1113 
1114 	TAILQ_FOREACH(srv, &gotwebd->servers, entry) {
1115 		if (addr_dup_check(&srv->al, h) == -1) {
1116 			free(h);
1117 			return 0;
1118 		}
1119 	}
1120 
1121 	if (addr_dup_check(&gotwebd->addresses, h) == 0) {
1122 		if ((dup = calloc(1, sizeof(*dup))) == NULL)
1123 			fatal("%s: calloc", __func__);
1124 		memcpy(dup, h, sizeof(*dup));
1125 		TAILQ_INSERT_TAIL(&gotwebd->addresses, dup, entry);
1126 	}
1127 
1128 	TAILQ_INSERT_TAIL(&new_srv->al, h, entry);
1129 	return (0);
1130 }