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