1 /*
2  * Copyright (c) 2016, 2019, 2020-2022 Tracey Emery <tracey@traceyemery.net>
3  * Copyright (c) 2015 Mike Larkin <mlarkin@openbsd.org>
4  * Copyright (c) 2014 Reyk Floeter <reyk@openbsd.org>
5  * Copyright (c) 2013 David Gwynne <dlg@openbsd.org>
6  * Copyright (c) 2013 Florian Obser <florian@openbsd.org>
7  *
8  * Permission to use, copy, modify, and distribute this software for any
9  * purpose with or without fee is hereby granted, provided that the above
10  * copyright notice and this permission notice appear in all copies.
11  *
12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19  */
20 
21 #include <net/if.h>
22 #include <netinet/in.h>
23 #include <sys/queue.h>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 
27 #include <ctype.h>
28 #include <dirent.h>
29 #include <errno.h>
30 #include <event.h>
31 #include <fcntl.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <sha2.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39 
40 #include "got_error.h"
41 #include "got_object.h"
42 #include "got_reference.h"
43 #include "got_repository.h"
44 #include "got_path.h"
45 #include "got_cancel.h"
46 #include "got_worktree.h"
47 #include "got_diff.h"
48 #include "got_commit_graph.h"
49 #include "got_blame.h"
50 #include "got_privsep.h"
51 
52 #include "gotwebd.h"
53 #include "tmpl.h"
54 
55 static const struct querystring_keys querystring_keys[] = {
56 	{ "action",		ACTION },
57 	{ "commit",		COMMIT },
58 	{ "file",		RFILE },
59 	{ "folder",		FOLDER },
60 	{ "headref",		HEADREF },
61 	{ "index_page",		INDEX_PAGE },
62 	{ "path",		PATH },
63 	{ "page",		PAGE },
64 };
65 
66 static const struct action_keys action_keys[] = {
67 	{ "blame",	BLAME },
68 	{ "blob",	BLOB },
69 	{ "blobraw",	BLOBRAW },
70 	{ "briefs",	BRIEFS },
71 	{ "commits",	COMMITS },
72 	{ "diff",	DIFF },
73 	{ "error",	ERR },
74 	{ "index",	INDEX },
75 	{ "summary",	SUMMARY },
76 	{ "tag",	TAG },
77 	{ "tags",	TAGS },
78 	{ "tree",	TREE },
79 	{ "rss",	RSS },
80 };
81 
82 static const struct got_error *gotweb_init_querystring(struct querystring **);
83 static const struct got_error *gotweb_parse_querystring(struct querystring **,
84     char *);
85 static const struct got_error *gotweb_assign_querystring(struct querystring **,
86     char *, char *);
87 static int gotweb_render_index(struct template *);
88 static const struct got_error *gotweb_init_repo_dir(struct repo_dir **,
89     const char *);
90 static const struct got_error *gotweb_load_got_path(struct request *c,
91     struct repo_dir *);
92 static const struct got_error *gotweb_get_repo_description(char **,
93     struct server *, const char *, int);
94 static const struct got_error *gotweb_get_clone_url(char **, struct server *,
95     const char *, int);
96 
97 static void gotweb_free_querystring(struct querystring *);
98 static void gotweb_free_repo_dir(struct repo_dir *);
99 
100 struct server *gotweb_get_server(const char *);
101 
102 static int
103 gotweb_reply(struct request *c, int status, const char *ctype,
104     struct gotweb_url *location)
105 {
106 	const char	*csp;
107 
108 	if (status != 200 && tp_writef(c->tp, "Status: %d\r\n", status) == -1)
109 		return -1;
110 
111 	if (location) {
112 		if (tp_writes(c->tp, "Location: ") == -1 ||
113 		    gotweb_render_url(c, location) == -1 ||
114 		    tp_writes(c->tp, "\r\n") == -1)
115 			return -1;
116 	}
117 
118 	csp = "Content-Security-Policy: default-src 'self'; "
119 	    "script-src 'none'; object-src 'none';\r\n";
120 	if (tp_writes(c->tp, csp) == -1)
121 		return -1;
122 
123 	if (ctype && tp_writef(c->tp, "Content-Type: %s\r\n", ctype) == -1)
124 		return -1;
125 
126 	return tp_writes(c->tp, "\r\n");
127 }
128 
129 static int
130 gotweb_reply_file(struct request *c, const char *ctype, const char *file,
131     const char *suffix)
132 {
133 	int r;
134 
135 	r = tp_writef(c->tp, "Content-Disposition: attachment; "
136 	    "filename=%s%s\r\n", file, suffix ? suffix : "");
137 	if (r == -1)
138 		return -1;
139 	return gotweb_reply(c, 200, ctype, NULL);
140 }
141 
142 void
143 gotweb_process_request(struct request *c)
144 {
145 	const struct got_error *error = NULL;
146 	struct server *srv = NULL;
147 	struct querystring *qs = NULL;
148 	struct repo_dir *repo_dir = NULL;
149 	const char *rss_ctype = "application/rss+xml;charset=utf-8";
150 	const uint8_t *buf;
151 	size_t len;
152 	int r, binary = 0;
153 
154 	/* init the transport */
155 	error = gotweb_init_transport(&c->t);
156 	if (error) {
157 		log_warnx("%s: %s", __func__, error->msg);
158 		return;
159 	}
160 	/* don't process any further if client disconnected */
161 	if (c->sock->client_status == CLIENT_DISCONNECT)
162 		return;
163 	/* get the gotwebd server */
164 	srv = gotweb_get_server(c->server_name);
165 	if (srv == NULL) {
166 		log_warnx("%s: error server is NULL", __func__);
167 		goto err;
168 	}
169 	c->srv = srv;
170 	/* parse our querystring */
171 	error = gotweb_init_querystring(&qs);
172 	if (error) {
173 		log_warnx("%s: %s", __func__, error->msg);
174 		goto err;
175 	}
176 	c->t->qs = qs;
177 	error = gotweb_parse_querystring(&qs, c->querystring);
178 	if (error) {
179 		log_warnx("%s: %s", __func__, error->msg);
180 		goto err;
181 	}
182 
183 	/*
184 	 * certain actions require a commit id in the querystring. this stops
185 	 * bad actors from exploiting this by manually manipulating the
186 	 * querystring.
187 	 */
188 
189 	if (qs->action == BLAME || qs->action == BLOB ||
190 	    qs->action == BLOBRAW || qs->action == DIFF) {
191 		if (qs->commit == NULL) {
192 			error = got_error(GOT_ERR_BAD_QUERYSTRING);
193 			goto err;
194 		}
195 	}
196 
197 	if (qs->action != INDEX) {
198 		error = gotweb_init_repo_dir(&repo_dir, qs->path);
199 		if (error)
200 			goto err;
201 		error = gotweb_load_got_path(c, repo_dir);
202 		c->t->repo_dir = repo_dir;
203 		if (error && error->code != GOT_ERR_LONELY_PACKIDX)
204 			goto err;
205 	}
206 
207 	if (qs->action == BLOBRAW || qs->action == BLOB) {
208 		error = got_get_repo_commits(c, 1);
209 		if (error)
210 			goto err;
211 
212 		error = got_open_blob_for_output(&c->t->blob, &c->t->fd,
213 		    &binary, c);
214 		if (error)
215 			goto err;
216 	}
217 
218 	switch(qs->action) {
219 	case BLAME:
220 		error = got_get_repo_commits(c, 1);
221 		if (error) {
222 			log_warnx("%s: %s", __func__, error->msg);
223 			goto err;
224 		}
225 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
226 			return;
227 		gotweb_render_page(c->tp, gotweb_render_blame);
228 		return;
229 	case BLOB:
230 		if (binary) {
231 			struct gotweb_url url = {
232 				.index_page = -1,
233 				.page = -1,
234 				.action = BLOBRAW,
235 				.path = qs->path,
236 				.commit = qs->commit,
237 				.folder = qs->folder,
238 				.file = qs->file,
239 			};
240 
241 			gotweb_reply(c, 302, NULL, &url);
242 			return;
243 		}
244 
245 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
246 			return;
247 		gotweb_render_page(c->tp, gotweb_render_blob);
248 		return;
249 	case BLOBRAW:
250 		if (binary)
251 			r = gotweb_reply_file(c, "application/octet-stream",
252 			    qs->file, NULL);
253 		else
254 			r = gotweb_reply(c, 200, "text/plain", NULL);
255 		if (r == -1)
256 			return;
257 		if (template_flush(c->tp) == -1)
258 			return;
259 
260 		for (;;) {
261 			error = got_object_blob_read_block(&len, c->t->blob);
262 			if (error)
263 				break;
264 			if (len == 0)
265 				break;
266 			buf = got_object_blob_get_read_buf(c->t->blob);
267 			if (fcgi_write(c, buf, len) == -1)
268 				break;
269 		}
270 		return;
271 	case BRIEFS:
272 		error = got_get_repo_commits(c, srv->max_commits_display);
273 		if (error)
274 			goto err;
275 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
276 			return;
277 		gotweb_render_page(c->tp, gotweb_render_briefs);
278 		return;
279 	case COMMITS:
280 		error = got_get_repo_commits(c, srv->max_commits_display);
281 		if (error) {
282 			log_warnx("%s: %s", __func__, error->msg);
283 			goto err;
284 		}
285 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
286 			return;
287 		gotweb_render_page(c->tp, gotweb_render_commits);
288 		return;
289 	case DIFF:
290 		error = got_get_repo_commits(c, 1);
291 		if (error) {
292 			log_warnx("%s: %s", __func__, error->msg);
293 			goto err;
294 		}
295 		error = got_open_diff_for_output(&c->t->fp, c);
296 		if (error) {
297 			log_warnx("%s: %s", __func__, error->msg);
298 			goto err;
299 		}
300 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
301 			return;
302 		gotweb_render_page(c->tp, gotweb_render_diff);
303 		return;
304 	case INDEX:
305 		c->t->nrepos = scandir(srv->repos_path, &c->t->repos, NULL,
306 		    alphasort);
307 		if (c->t->nrepos == -1) {
308 			c->t->repos = NULL;
309 			error = got_error_from_errno2("scandir",
310 			    srv->repos_path);
311 			goto err;
312 		}
313 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
314 			return;
315 		gotweb_render_page(c->tp, gotweb_render_index);
316 		return;
317 	case RSS:
318 		error = got_get_repo_tags(c, D_MAXSLCOMMDISP);
319 		if (error)
320 			goto err;
321 		if (gotweb_reply_file(c, rss_ctype, repo_dir->name, ".rss")
322 		    == -1)
323 			return;
324 		gotweb_render_rss(c->tp);
325 		return;
326 	case SUMMARY:
327 		error = got_ref_list(&c->t->refs, c->t->repo, "refs/heads",
328 		    got_ref_cmp_by_name, NULL);
329 		if (error) {
330 			log_warnx("%s: got_ref_list: %s", __func__,
331 			    error->msg);
332 			goto err;
333 		}
334 		error = got_get_repo_commits(c, D_MAXSLCOMMDISP);
335 		if (error)
336 			goto err;
337 		qs->action = TAGS;
338 		error = got_get_repo_tags(c, D_MAXSLCOMMDISP);
339 		if (error) {
340 			log_warnx("%s: got_get_repo_tags: %s", __func__,
341 			    error->msg);
342 			goto err;
343 		}
344 		qs->action = SUMMARY;
345 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
346 			return;
347 		gotweb_render_page(c->tp, gotweb_render_summary);
348 		return;
349 	case TAG:
350 		error = got_get_repo_tags(c, 1);
351 		if (error) {
352 			log_warnx("%s: %s", __func__, error->msg);
353 			goto err;
354 		}
355 		if (c->t->tag_count == 0) {
356 			error = got_error_msg(GOT_ERR_BAD_OBJ_ID,
357 			    "bad commit id");
358 			goto err;
359 		}
360 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
361 			return;
362 		gotweb_render_page(c->tp, gotweb_render_tag);
363 		return;
364 	case TAGS:
365 		error = got_get_repo_tags(c, srv->max_commits_display);
366 		if (error) {
367 			log_warnx("%s: %s", __func__, error->msg);
368 			goto err;
369 		}
370 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
371 			return;
372 		gotweb_render_page(c->tp, gotweb_render_tags);
373 		return;
374 	case TREE:
375 		error = got_get_repo_commits(c, 1);
376 		if (error) {
377 			log_warnx("%s: %s", __func__, error->msg);
378 			goto err;
379 		}
380 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
381 			return;
382 		gotweb_render_page(c->tp, gotweb_render_tree);
383 		return;
384 	case ERR:
385 	default:
386 		error = got_error(GOT_ERR_BAD_QUERYSTRING);
387 	}
388 
389 err:
390 	c->t->error = error;
391 	if (gotweb_reply(c, 400, "text/html", NULL) == -1)
392 		return;
393 	gotweb_render_page(c->tp, gotweb_render_error);
394 }
395 
396 struct server *
397 gotweb_get_server(const char *server_name)
398 {
399 	struct server *srv;
400 
401 	/* check against the server name first */
402 	if (*server_name != '\0')
403 		TAILQ_FOREACH(srv, &gotwebd_env->servers, entry)
404 			if (strcmp(srv->name, server_name) == 0)
405 				return srv;
406 
407 	/* otherwise, use the first server */
408 	return TAILQ_FIRST(&gotwebd_env->servers);
409 };
410 
411 const struct got_error *
412 gotweb_init_transport(struct transport **t)
413 {
414 	const struct got_error *error = NULL;
415 
416 	*t = calloc(1, sizeof(**t));
417 	if (*t == NULL)
418 		return got_error_from_errno2(__func__, "calloc");
419 
420 	TAILQ_INIT(&(*t)->repo_commits);
421 	TAILQ_INIT(&(*t)->repo_tags);
422 	TAILQ_INIT(&(*t)->refs);
423 
424 	(*t)->fd = -1;
425 
426 	return error;
427 }
428 
429 static const struct got_error *
430 gotweb_init_querystring(struct querystring **qs)
431 {
432 	const struct got_error *error = NULL;
433 
434 	*qs = calloc(1, sizeof(**qs));
435 	if (*qs == NULL)
436 		return got_error_from_errno2(__func__, "calloc");
437 
438 	(*qs)->headref = strdup("HEAD");
439 	if ((*qs)->headref == NULL) {
440 		free(*qs);
441 		*qs = NULL;
442 		return got_error_from_errno2(__func__, "strdup");
443 	}
444 
445 	(*qs)->action = INDEX;
446 	(*qs)->commit = NULL;
447 	(*qs)->file = NULL;
448 	(*qs)->folder = NULL;
449 	(*qs)->index_page = 0;
450 	(*qs)->path = NULL;
451 
452 	return error;
453 }
454 
455 static const struct got_error *
456 gotweb_parse_querystring(struct querystring **qs, char *qst)
457 {
458 	const struct got_error *error = NULL;
459 	char *tok1 = NULL, *tok1_pair = NULL, *tok1_end = NULL;
460 	char *tok2 = NULL, *tok2_pair = NULL, *tok2_end = NULL;
461 
462 	if (qst == NULL)
463 		return error;
464 
465 	tok1 = strdup(qst);
466 	if (tok1 == NULL)
467 		return got_error_from_errno2(__func__, "strdup");
468 
469 	tok1_pair = tok1;
470 	tok1_end = tok1;
471 
472 	while (tok1_pair != NULL) {
473 		strsep(&tok1_end, "&");
474 
475 		tok2 = strdup(tok1_pair);
476 		if (tok2 == NULL) {
477 			free(tok1);
478 			return got_error_from_errno2(__func__, "strdup");
479 		}
480 
481 		tok2_pair = tok2;
482 		tok2_end = tok2;
483 
484 		while (tok2_pair != NULL) {
485 			strsep(&tok2_end, "=");
486 			if (tok2_end) {
487 				error = gotweb_assign_querystring(qs, tok2_pair,
488 				    tok2_end);
489 				if (error)
490 					goto err;
491 			}
492 			tok2_pair = tok2_end;
493 		}
494 		free(tok2);
495 		tok1_pair = tok1_end;
496 	}
497 	free(tok1);
498 	return error;
499 err:
500 	free(tok2);
501 	free(tok1);
502 	return error;
503 }
504 
505 /*
506  * Adapted from usr.sbin/httpd/httpd.c url_decode.
507  */
508 static const struct got_error *
509 gotweb_urldecode(char *url)
510 {
511 	char		*p, *q;
512 	char		 hex[3];
513 	unsigned long	 x;
514 
515 	hex[2] = '\0';
516 	p = q = url;
517 
518 	while (*p != '\0') {
519 		switch (*p) {
520 		case '%':
521 			/* Encoding character is followed by two hex chars */
522 			if (!isxdigit((unsigned char)p[1]) ||
523 			    !isxdigit((unsigned char)p[2]) ||
524 			    (p[1] == '0' && p[2] == '0'))
525 				return got_error(GOT_ERR_BAD_QUERYSTRING);
526 
527 			hex[0] = p[1];
528 			hex[1] = p[2];
529 
530 			/*
531 			 * We don't have to validate "hex" because it is
532 			 * guaranteed to include two hex chars followed by nul.
533 			 */
534 			x = strtoul(hex, NULL, 16);
535 			*q = (char)x;
536 			p += 2;
537 			break;
538 		default:
539 			*q = *p;
540 			break;
541 		}
542 		p++;
543 		q++;
544 	}
545 	*q = '\0';
546 
547 	return NULL;
548 }
549 
550 static const struct got_error *
551 gotweb_assign_querystring(struct querystring **qs, char *key, char *value)
552 {
553 	const struct got_error *error = NULL;
554 	const char *errstr;
555 	int a_cnt, el_cnt;
556 
557 	error = gotweb_urldecode(value);
558 	if (error)
559 		return error;
560 
561 	for (el_cnt = 0; el_cnt < nitems(querystring_keys); el_cnt++) {
562 		if (strcmp(key, querystring_keys[el_cnt].name) != 0)
563 			continue;
564 
565 		switch (querystring_keys[el_cnt].element) {
566 		case ACTION:
567 			for (a_cnt = 0; a_cnt < ACTIONS__MAX; a_cnt++) {
568 				if (strcmp(value, action_keys[a_cnt].name) != 0)
569 					continue;
570 				else if (strcmp(value,
571 				    action_keys[a_cnt].name) == 0){
572 					(*qs)->action =
573 					    action_keys[a_cnt].action;
574 					goto qa_found;
575 				}
576 			}
577 			(*qs)->action = ERR;
578 qa_found:
579 			break;
580 		case COMMIT:
581 			(*qs)->commit = strdup(value);
582 			if ((*qs)->commit == NULL) {
583 				error = got_error_from_errno2(__func__,
584 				    "strdup");
585 				goto done;
586 			}
587 			break;
588 		case RFILE:
589 			(*qs)->file = strdup(value);
590 			if ((*qs)->file == NULL) {
591 				error = got_error_from_errno2(__func__,
592 				    "strdup");
593 				goto done;
594 			}
595 			break;
596 		case FOLDER:
597 			(*qs)->folder = strdup(value);
598 			if ((*qs)->folder == NULL) {
599 				error = got_error_from_errno2(__func__,
600 				    "strdup");
601 				goto done;
602 			}
603 			break;
604 		case HEADREF:
605 			free((*qs)->headref);
606 			(*qs)->headref = strdup(value);
607 			if ((*qs)->headref == NULL) {
608 				error = got_error_from_errno2(__func__,
609 				    "strdup");
610 				goto done;
611 			}
612 			break;
613 		case INDEX_PAGE:
614 			if (*value == '\0')
615 				break;
616 			(*qs)->index_page = strtonum(value, INT64_MIN,
617 			    INT64_MAX, &errstr);
618 			if (errstr) {
619 				error = got_error_from_errno3(__func__,
620 				    "strtonum", errstr);
621 				goto done;
622 			}
623 			if ((*qs)->index_page < 0)
624 				(*qs)->index_page = 0;
625 			break;
626 		case PATH:
627 			(*qs)->path = strdup(value);
628 			if ((*qs)->path == NULL) {
629 				error = got_error_from_errno2(__func__,
630 				    "strdup");
631 				goto done;
632 			}
633 			break;
634 		case PAGE:
635 			if (*value == '\0')
636 				break;
637 			(*qs)->page = strtonum(value, INT64_MIN,
638 			    INT64_MAX, &errstr);
639 			if (errstr) {
640 				error = got_error_from_errno3(__func__,
641 				    "strtonum", errstr);
642 				goto done;
643 			}
644 			if ((*qs)->page < 0)
645 				(*qs)->page = 0;
646 			break;
647 		}
648 
649 		/* entry found */
650 		break;
651 	}
652 done:
653 	return error;
654 }
655 
656 void
657 gotweb_free_repo_tag(struct repo_tag *rt)
658 {
659 	if (rt != NULL) {
660 		free(rt->commit_id);
661 		free(rt->tag_name);
662 		free(rt->tag_commit);
663 		free(rt->commit_msg);
664 		free(rt->tagger);
665 	}
666 	free(rt);
667 }
668 
669 void
670 gotweb_free_repo_commit(struct repo_commit *rc)
671 {
672 	if (rc != NULL) {
673 		free(rc->path);
674 		free(rc->refs_str);
675 		free(rc->commit_id);
676 		free(rc->parent_id);
677 		free(rc->tree_id);
678 		free(rc->author);
679 		free(rc->committer);
680 		free(rc->commit_msg);
681 	}
682 	free(rc);
683 }
684 
685 static void
686 gotweb_free_querystring(struct querystring *qs)
687 {
688 	if (qs != NULL) {
689 		free(qs->commit);
690 		free(qs->file);
691 		free(qs->folder);
692 		free(qs->headref);
693 		free(qs->path);
694 	}
695 	free(qs);
696 }
697 
698 static void
699 gotweb_free_repo_dir(struct repo_dir *repo_dir)
700 {
701 	if (repo_dir != NULL) {
702 		free(repo_dir->name);
703 		free(repo_dir->owner);
704 		free(repo_dir->description);
705 		free(repo_dir->url);
706 		free(repo_dir->path);
707 	}
708 	free(repo_dir);
709 }
710 
711 void
712 gotweb_free_transport(struct transport *t)
713 {
714 	const struct got_error *err;
715 	struct repo_commit *rc = NULL, *trc = NULL;
716 	struct repo_tag *rt = NULL, *trt = NULL;
717 	int i;
718 
719 	got_ref_list_free(&t->refs);
720 	TAILQ_FOREACH_SAFE(rc, &t->repo_commits, entry, trc) {
721 		TAILQ_REMOVE(&t->repo_commits, rc, entry);
722 		gotweb_free_repo_commit(rc);
723 	}
724 	TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
725 		TAILQ_REMOVE(&t->repo_tags, rt, entry);
726 		gotweb_free_repo_tag(rt);
727 	}
728 	gotweb_free_repo_dir(t->repo_dir);
729 	gotweb_free_querystring(t->qs);
730 	free(t->more_id);
731 	free(t->next_id);
732 	free(t->prev_id);
733 	if (t->blob)
734 		got_object_blob_close(t->blob);
735 	if (t->fp) {
736 		err = got_gotweb_closefile(t->fp);
737 		if (err)
738 			log_warnx("%s: got_gotweb_closefile failure: %s",
739 			    __func__, err->msg);
740 	}
741 	if (t->fd != -1 && close(t->fd) == -1)
742 		log_warn("%s: close", __func__);
743 	if (t->repos) {
744 		for (i = 0; i < t->nrepos; ++i)
745 			free(t->repos[i]);
746 		free(t->repos);
747 	}
748 	free(t);
749 }
750 
751 void
752 gotweb_get_navs(struct request *c, struct gotweb_url *prev, int *have_prev,
753     struct gotweb_url *next, int *have_next)
754 {
755 	struct transport *t = c->t;
756 	struct querystring *qs = t->qs;
757 	struct server *srv = c->srv;
758 
759 	*have_prev = *have_next = 0;
760 
761 	switch(qs->action) {
762 	case INDEX:
763 		if (qs->index_page > 0) {
764 			*have_prev = 1;
765 			*prev = (struct gotweb_url){
766 				.action = -1,
767 				.index_page = qs->index_page - 1,
768 				.page = -1,
769 			};
770 		}
771 		if (t->next_disp == srv->max_repos_display &&
772 		    t->repos_total != (qs->index_page + 1) *
773 		    srv->max_repos_display) {
774 			*have_next = 1;
775 			*next = (struct gotweb_url){
776 				.action = -1,
777 				.index_page = qs->index_page + 1,
778 				.page = -1,
779 			};
780 		}
781 		break;
782 	case TAGS:
783 		if (t->prev_id && qs->commit != NULL &&
784 		    strcmp(qs->commit, t->prev_id) != 0) {
785 			*have_prev = 1;
786 			*prev = (struct gotweb_url){
787 				.action = TAGS,
788 				.index_page = -1,
789 				.page = qs->page - 1,
790 				.path = qs->path,
791 				.commit = t->prev_id,
792 				.headref = qs->headref,
793 			};
794 		}
795 		if (t->next_id) {
796 			*have_next = 1;
797 			*next = (struct gotweb_url){
798 				.action = TAGS,
799 				.index_page = -1,
800 				.page = qs->page + 1,
801 				.path = qs->path,
802 				.commit = t->next_id,
803 				.headref = qs->headref,
804 			};
805 		}
806 		break;
807 	}
808 }
809 
810 static int
811 gotweb_render_index(struct template *tp)
812 {
813 	const struct got_error *error = NULL;
814 	struct request *c = tp->tp_arg;
815 	struct server *srv = c->srv;
816 	struct transport *t = c->t;
817 	struct querystring *qs = t->qs;
818 	struct repo_dir *repo_dir = NULL;
819 	struct dirent **sd_dent = t->repos;
820 	unsigned int d_i, d_disp = 0;
821 	unsigned int d_skipped = 0;
822 	int type, r;
823 
824 	if (gotweb_render_repo_table_hdr(c->tp) == -1)
825 		return -1;
826 
827 	for (d_i = 0; d_i < t->nrepos; d_i++) {
828 		if (srv->max_repos > 0 && t->prev_disp == srv->max_repos)
829 			break;
830 
831 		if (strcmp(sd_dent[d_i]->d_name, ".") == 0 ||
832 		    strcmp(sd_dent[d_i]->d_name, "..") == 0) {
833 			d_skipped++;
834 			continue;
835 		}
836 
837 		error = got_path_dirent_type(&type, srv->repos_path,
838 		    sd_dent[d_i]);
839 		if (error)
840 			continue;
841 		if (type != DT_DIR) {
842 			d_skipped++;
843 			continue;
844 		}
845 
846 		if (qs->index_page > 0 && (qs->index_page *
847 		    srv->max_repos_display) > t->prev_disp) {
848 			t->prev_disp++;
849 			continue;
850 		}
851 
852 		error = gotweb_init_repo_dir(&repo_dir, sd_dent[d_i]->d_name);
853 		if (error)
854 			continue;
855 
856 		error = gotweb_load_got_path(c, repo_dir);
857 		if (error && error->code != GOT_ERR_LONELY_PACKIDX) {
858 			if (error->code != GOT_ERR_NOT_GIT_REPO)
859 				log_warnx("%s: %s: %s", __func__,
860 				    sd_dent[d_i]->d_name, error->msg);
861 			gotweb_free_repo_dir(repo_dir);
862 			repo_dir = NULL;
863 			d_skipped++;
864 			continue;
865 		}
866 
867 		d_disp++;
868 		t->prev_disp++;
869 
870 		r = gotweb_render_repo_fragment(c->tp, repo_dir);
871 		gotweb_free_repo_dir(repo_dir);
872 		if (r == -1)
873 			return -1;
874 
875 		t->next_disp++;
876 		if (d_disp == srv->max_repos_display)
877 			break;
878 	}
879 	t->repos_total = t->nrepos - d_skipped;
880 
881 	if (srv->max_repos_display == 0)
882 		return 0;
883 	if (srv->max_repos > 0 && srv->max_repos < srv->max_repos_display)
884 		return 0;
885 	if (t->repos_total <= srv->max_repos ||
886 	    t->repos_total <= srv->max_repos_display)
887 		return 0;
888 
889 	if (gotweb_render_navs(c->tp) == -1)
890 		return -1;
891 
892 	return 0;
893 }
894 
895 static inline int
896 should_urlencode(int c)
897 {
898 	if (c <= ' ' || c >= 127)
899 		return 1;
900 
901 	switch (c) {
902 		/* gen-delim */
903 	case ':':
904 	case '/':
905 	case '?':
906 	case '#':
907 	case '[':
908 	case ']':
909 	case '@':
910 		/* sub-delims */
911 	case '!':
912 	case '$':
913 	case '&':
914 	case '\'':
915 	case '(':
916 	case ')':
917 	case '*':
918 	case '+':
919 	case ',':
920 	case ';':
921 	case '=':
922 		/* needed because the URLs are embedded into the HTML */
923 	case '\"':
924 		return 1;
925 	default:
926 		return 0;
927 	}
928 }
929 
930 static char *
931 gotweb_urlencode(const char *str)
932 {
933 	const char *s;
934 	char *escaped;
935 	size_t i, len;
936 	int a, b;
937 
938 	len = 0;
939 	for (s = str; *s; ++s) {
940 		len++;
941 		if (should_urlencode(*s))
942 			len += 2;
943 	}
944 
945 	escaped = calloc(1, len + 1);
946 	if (escaped == NULL)
947 		return NULL;
948 
949 	i = 0;
950 	for (s = str; *s; ++s) {
951 		if (should_urlencode(*s)) {
952 			a = (*s & 0xF0) >> 4;
953 			b = (*s & 0x0F);
954 
955 			escaped[i++] = '%';
956 			escaped[i++] = a <= 9 ? ('0' + a) : ('7' + a);
957 			escaped[i++] = b <= 9 ? ('0' + b) : ('7' + b);
958 		} else
959 			escaped[i++] = *s;
960 	}
961 
962 	return escaped;
963 }
964 
965 const char *
966 gotweb_action_name(int action)
967 {
968 	switch (action) {
969 	case BLAME:
970 		return "blame";
971 	case BLOB:
972 		return "blob";
973 	case BLOBRAW:
974 		return "blobraw";
975 	case BRIEFS:
976 		return "briefs";
977 	case COMMITS:
978 		return "commits";
979 	case DIFF:
980 		return "diff";
981 	case ERR:
982 		return "err";
983 	case INDEX:
984 		return "index";
985 	case SUMMARY:
986 		return "summary";
987 	case TAG:
988 		return "tag";
989 	case TAGS:
990 		return "tags";
991 	case TREE:
992 		return "tree";
993 	case RSS:
994 		return "rss";
995 	default:
996 		return NULL;
997 	}
998 }
999 
1000 int
1001 gotweb_render_url(struct request *c, struct gotweb_url *url)
1002 {
1003 	const char *sep = "?", *action;
1004 	char *tmp;
1005 	int r;
1006 
1007 	action = gotweb_action_name(url->action);
1008 	if (action != NULL) {
1009 		if (tp_writef(c->tp, "?action=%s", action) == -1)
1010 			return -1;
1011 		sep = "&";
1012 	}
1013 
1014 	if (url->commit) {
1015 		if (tp_writef(c->tp, "%scommit=%s", sep, url->commit) == -1)
1016 			return -1;
1017 		sep = "&";
1018 	}
1019 
1020 	if (url->previd) {
1021 		if (tp_writef(c->tp, "%sprevid=%s", sep, url->previd) == -1)
1022 			return -1;
1023 		sep = "&";
1024 	}
1025 
1026 	if (url->prevset) {
1027 		if (tp_writef(c->tp, "%sprevset=%s", sep, url->prevset) == -1)
1028 			return -1;
1029 		sep = "&";
1030 	}
1031 
1032 	if (url->file) {
1033 		tmp = gotweb_urlencode(url->file);
1034 		if (tmp == NULL)
1035 			return -1;
1036 		r = tp_writef(c->tp, "%sfile=%s", sep, tmp);
1037 		free(tmp);
1038 		if (r == -1)
1039 			return -1;
1040 		sep = "&";
1041 	}
1042 
1043 	if (url->folder) {
1044 		tmp = gotweb_urlencode(url->folder);
1045 		if (tmp == NULL)
1046 			return -1;
1047 		r = tp_writef(c->tp, "%sfolder=%s", sep, tmp);
1048 		free(tmp);
1049 		if (r == -1)
1050 			return -1;
1051 		sep = "&";
1052 	}
1053 
1054 	if (url->headref) {
1055 		tmp = gotweb_urlencode(url->headref);
1056 		if (tmp == NULL)
1057 			return -1;
1058 		r = tp_writef(c->tp, "%sheadref=%s", sep, url->headref);
1059 		free(tmp);
1060 		if (r == -1)
1061 			return -1;
1062 		sep = "&";
1063 	}
1064 
1065 	if (url->index_page != -1) {
1066 		if (tp_writef(c->tp, "%sindex_page=%d", sep,
1067 		    url->index_page) == -1)
1068 			return -1;
1069 		sep = "&";
1070 	}
1071 
1072 	if (url->path) {
1073 		tmp = gotweb_urlencode(url->path);
1074 		if (tmp == NULL)
1075 			return -1;
1076 		r = tp_writef(c->tp, "%spath=%s", sep, tmp);
1077 		free(tmp);
1078 		if (r == -1)
1079 			return -1;
1080 		sep = "&";
1081 	}
1082 
1083 	if (url->page != -1) {
1084 		if (tp_writef(c->tp, "%spage=%d", sep, url->page) == -1)
1085 			return -1;
1086 		sep = "&";
1087 	}
1088 
1089 	return 0;
1090 }
1091 
1092 int
1093 gotweb_render_absolute_url(struct request *c, struct gotweb_url *url)
1094 {
1095 	struct template	*tp = c->tp;
1096 	const char	*proto = c->https ? "https" : "http";
1097 
1098 	if (tp_writes(tp, proto) == -1 ||
1099 	    tp_writes(tp, "://") == -1 ||
1100 	    tp_htmlescape(tp, c->server_name) == -1 ||
1101 	    tp_htmlescape(tp, c->document_uri) == -1)
1102 		return -1;
1103 
1104 	return gotweb_render_url(c, url);
1105 }
1106 
1107 static struct got_repository *
1108 find_cached_repo(struct server *srv, const char *path)
1109 {
1110 	int i;
1111 
1112 	for (i = 0; i < srv->ncached_repos; i++) {
1113 		if (strcmp(srv->cached_repos[i].path, path) == 0)
1114 			return srv->cached_repos[i].repo;
1115 	}
1116 
1117 	return NULL;
1118 }
1119 
1120 static const struct got_error *
1121 cache_repo(struct got_repository **new, struct server *srv,
1122     struct repo_dir *repo_dir, struct socket *sock)
1123 {
1124 	const struct got_error *error = NULL;
1125 	struct got_repository *repo;
1126 	struct cached_repo *cr;
1127 	int evicted = 0;
1128 
1129 	if (srv->ncached_repos >= GOTWEBD_REPO_CACHESIZE) {
1130 		cr = &srv->cached_repos[srv->ncached_repos - 1];
1131 		error = got_repo_close(cr->repo);
1132 		memset(cr, 0, sizeof(*cr));
1133 		srv->ncached_repos--;
1134 		if (error)
1135 			return error;
1136 		memmove(&srv->cached_repos[1], &srv->cached_repos[0],
1137 		    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1138 		cr = &srv->cached_repos[0];
1139 		evicted = 1;
1140 	} else {
1141 		cr = &srv->cached_repos[srv->ncached_repos];
1142 	}
1143 
1144 	error = got_repo_open(&repo, repo_dir->path, NULL, sock->pack_fds);
1145 	if (error) {
1146 		if (evicted) {
1147 			memmove(&srv->cached_repos[0], &srv->cached_repos[1],
1148 			    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1149 		}
1150 		return error;
1151 	}
1152 
1153 	if (strlcpy(cr->path, repo_dir->path, sizeof(cr->path))
1154 	    >= sizeof(cr->path)) {
1155 		if (evicted) {
1156 			memmove(&srv->cached_repos[0], &srv->cached_repos[1],
1157 			    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1158 		}
1159 		return got_error(GOT_ERR_NO_SPACE);
1160 	}
1161 
1162 	cr->repo = repo;
1163 	srv->ncached_repos++;
1164 	*new = repo;
1165 	return NULL;
1166 }
1167 
1168 static const struct got_error *
1169 gotweb_load_got_path(struct request *c, struct repo_dir *repo_dir)
1170 {
1171 	const struct got_error *error = NULL;
1172 	struct socket *sock = c->sock;
1173 	struct server *srv = c->srv;
1174 	struct transport *t = c->t;
1175 	struct got_repository *repo = NULL;
1176 	DIR *dt;
1177 	char *dir_test;
1178 
1179 	if (asprintf(&dir_test, "%s/%s/%s", srv->repos_path, repo_dir->name,
1180 	    GOTWEB_GIT_DIR) == -1)
1181 		return got_error_from_errno("asprintf");
1182 
1183 	dt = opendir(dir_test);
1184 	if (dt == NULL) {
1185 		free(dir_test);
1186 	} else {
1187 		repo_dir->path = dir_test;
1188 		dir_test = NULL;
1189 		goto done;
1190 	}
1191 
1192 	if (asprintf(&dir_test, "%s/%s", srv->repos_path,
1193 	    repo_dir->name) == -1)
1194 		return got_error_from_errno("asprintf");
1195 
1196 	dt = opendir(dir_test);
1197 	if (dt == NULL) {
1198 		error = got_error_path(repo_dir->name, GOT_ERR_NOT_GIT_REPO);
1199 		goto err;
1200 	} else {
1201 		repo_dir->path = dir_test;
1202 		dir_test = NULL;
1203 	}
1204 
1205 done:
1206 	if (srv->respect_exportok &&
1207 	    faccessat(dirfd(dt), "git-daemon-export-ok", F_OK, 0) == -1) {
1208 		error = got_error_path(repo_dir->name, GOT_ERR_NOT_GIT_REPO);
1209 		goto err;
1210 	}
1211 
1212 	repo = find_cached_repo(srv, repo_dir->path);
1213 	if (repo == NULL) {
1214 		error = cache_repo(&repo, srv, repo_dir, sock);
1215 		if (error)
1216 			goto err;
1217 	}
1218 	t->repo = repo;
1219 	error = gotweb_get_repo_description(&repo_dir->description, srv,
1220 	    repo_dir->path, dirfd(dt));
1221 	if (error)
1222 		goto err;
1223 	error = got_get_repo_owner(&repo_dir->owner, c);
1224 	if (error)
1225 		goto err;
1226 	if (srv->show_repo_age) {
1227 		error = got_get_repo_age(&repo_dir->age, c, NULL);
1228 		if (error)
1229 			goto err;
1230 	}
1231 	error = gotweb_get_clone_url(&repo_dir->url, srv, repo_dir->path,
1232 	    dirfd(dt));
1233 err:
1234 	free(dir_test);
1235 	if (dt != NULL && closedir(dt) == EOF && error == NULL)
1236 		error = got_error_from_errno("closedir");
1237 	return error;
1238 }
1239 
1240 static const struct got_error *
1241 gotweb_init_repo_dir(struct repo_dir **repo_dir, const char *dir)
1242 {
1243 	const struct got_error *error;
1244 
1245 	*repo_dir = calloc(1, sizeof(**repo_dir));
1246 	if (*repo_dir == NULL)
1247 		return got_error_from_errno("calloc");
1248 
1249 	if (asprintf(&(*repo_dir)->name, "%s", dir) == -1) {
1250 		error = got_error_from_errno("asprintf");
1251 		free(*repo_dir);
1252 		*repo_dir = NULL;
1253 		return error;
1254 	}
1255 	(*repo_dir)->owner = NULL;
1256 	(*repo_dir)->description = NULL;
1257 	(*repo_dir)->url = NULL;
1258 	(*repo_dir)->path = NULL;
1259 
1260 	return NULL;
1261 }
1262 
1263 static const struct got_error *
1264 gotweb_get_repo_description(char **description, struct server *srv,
1265     const char *dirpath, int dir)
1266 {
1267 	const struct got_error *error = NULL;
1268 	struct stat sb;
1269 	int fd = -1;
1270 	off_t len;
1271 
1272 	*description = NULL;
1273 	if (srv->show_repo_description == 0)
1274 		return NULL;
1275 
1276 	fd = openat(dir, "description", O_RDONLY);
1277 	if (fd == -1) {
1278 		if (errno != ENOENT && errno != EACCES) {
1279 			error = got_error_from_errno_fmt("openat %s/%s",
1280 			    dirpath, "description");
1281 		}
1282 		goto done;
1283 	}
1284 
1285 	if (fstat(fd, &sb) == -1) {
1286 		error = got_error_from_errno_fmt("fstat %s/%s",
1287 		    dirpath, "description");
1288 		goto done;
1289 	}
1290 
1291 	len = sb.st_size;
1292 	if (len > GOTWEBD_MAXDESCRSZ - 1)
1293 		len = GOTWEBD_MAXDESCRSZ - 1;
1294 
1295 	*description = calloc(len + 1, sizeof(**description));
1296 	if (*description == NULL) {
1297 		error = got_error_from_errno("calloc");
1298 		goto done;
1299 	}
1300 
1301 	if (read(fd, *description, len) == -1)
1302 		error = got_error_from_errno("read");
1303 done:
1304 	if (fd != -1 && close(fd) == -1 && error == NULL)
1305 		error = got_error_from_errno("close");
1306 	return error;
1307 }
1308 
1309 static const struct got_error *
1310 gotweb_get_clone_url(char **url, struct server *srv, const char *dirpath,
1311     int dir)
1312 {
1313 	const struct got_error *error = NULL;
1314 	struct stat sb;
1315 	int fd = -1;
1316 	off_t len;
1317 
1318 	*url = NULL;
1319 	if (srv->show_repo_cloneurl == 0)
1320 		return NULL;
1321 
1322 	fd = openat(dir, "cloneurl", O_RDONLY);
1323 	if (fd == -1) {
1324 		if (errno != ENOENT && errno != EACCES) {
1325 			error = got_error_from_errno_fmt("openat %s/%s",
1326 			    dirpath, "cloneurl");
1327 		}
1328 		goto done;
1329 	}
1330 
1331 	if (fstat(fd, &sb) == -1) {
1332 		error = got_error_from_errno_fmt("fstat %s/%s",
1333 		    dirpath, "cloneurl");
1334 		goto done;
1335 	}
1336 
1337 	len = sb.st_size;
1338 	if (len > GOTWEBD_MAXCLONEURLSZ - 1)
1339 		len = GOTWEBD_MAXCLONEURLSZ - 1;
1340 
1341 	*url = calloc(len + 1, sizeof(**url));
1342 	if (*url == NULL) {
1343 		error = got_error_from_errno("calloc");
1344 		goto done;
1345 	}
1346 
1347 	if (read(fd, *url, len) == -1)
1348 		error = got_error_from_errno("read");
1349 done:
1350 	if (fd != -1 && close(fd) == -1 && error == NULL)
1351 		error = got_error_from_errno("close");
1352 	return error;
1353 }
1354 
1355 int
1356 gotweb_render_age(struct template *tp, time_t committer_time)
1357 {
1358 	struct request *c = tp->tp_arg;
1359 	long long diff_time;
1360 	const char *years = "years ago", *months = "months ago";
1361 	const char *weeks = "weeks ago", *days = "days ago";
1362 	const char *hours = "hours ago",  *minutes = "minutes ago";
1363 	const char *seconds = "seconds ago", *now = "right now";
1364 
1365 	diff_time = time(NULL) - committer_time;
1366 	if (diff_time > 60 * 60 * 24 * 365 * 2) {
1367 		if (tp_writef(c->tp, "%lld %s",
1368 		    (diff_time / 60 / 60 / 24 / 365), years) == -1)
1369 			return -1;
1370 	} else if (diff_time > 60 * 60 * 24 * (365 / 12) * 2) {
1371 		if (tp_writef(c->tp, "%lld %s",
1372 		    (diff_time / 60 / 60 / 24 / (365 / 12)),
1373 		    months) == -1)
1374 			return -1;
1375 	} else if (diff_time > 60 * 60 * 24 * 7 * 2) {
1376 		if (tp_writef(c->tp, "%lld %s",
1377 		    (diff_time / 60 / 60 / 24 / 7), weeks) == -1)
1378 			return -1;
1379 	} else if (diff_time > 60 * 60 * 24 * 2) {
1380 		if (tp_writef(c->tp, "%lld %s",
1381 		    (diff_time / 60 / 60 / 24), days) == -1)
1382 			return -1;
1383 	} else if (diff_time > 60 * 60 * 2) {
1384 		if (tp_writef(c->tp, "%lld %s",
1385 		    (diff_time / 60 / 60), hours) == -1)
1386 			return -1;
1387 	} else if (diff_time > 60 * 2) {
1388 		if (tp_writef(c->tp, "%lld %s", (diff_time / 60),
1389 		    minutes) == -1)
1390 			return -1;
1391 	} else if (diff_time > 2) {
1392 		if (tp_writef(c->tp, "%lld %s", diff_time,
1393 		    seconds) == -1)
1394 			return -1;
1395 	} else {
1396 		if (tp_writes(tp, now) == -1)
1397 			return -1;
1398 	}
1399 	return 0;
1400 }