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 #include "got_compat.h"
21 
22 #include <net/if.h>
23 #include <netinet/in.h>
24 #include <sys/queue.h>
25 #include <sys/stat.h>
26 #include <sys/types.h>
27 
28 #include <ctype.h>
29 #include <dirent.h>
30 #include <errno.h>
31 #include <event.h>
32 #include <fcntl.h>
33 #include <imsg.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38 
39 #include "got_error.h"
40 #include "got_object.h"
41 #include "got_reference.h"
42 #include "got_repository.h"
43 #include "got_path.h"
44 #include "got_cancel.h"
45 #include "got_worktree.h"
46 #include "got_diff.h"
47 #include "got_commit_graph.h"
48 #include "got_blame.h"
49 #include "got_privsep.h"
50 
51 #include "proc.h"
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 && fcgi_printf(c, "Status: %d\r\n", status) == -1)
109 		return -1;
110 
111 	if (location) {
112 		if (fcgi_puts(c->tp, "Location: ") == -1 ||
113 		    gotweb_render_url(c, location) == -1 ||
114 		    fcgi_puts(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 (fcgi_puts(c->tp, csp) == -1)
121 		return -1;
122 
123 	if (ctype && fcgi_printf(c, "Content-Type: %s\r\n", ctype) == -1)
124 		return -1;
125 
126 	return fcgi_puts(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 = fcgi_printf(c, "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 
258 		for (;;) {
259 			error = got_object_blob_read_block(&len, c->t->blob);
260 			if (error)
261 				break;
262 			if (len == 0)
263 				break;
264 			buf = got_object_blob_get_read_buf(c->t->blob);
265 			if (fcgi_gen_binary_response(c, buf, len) == -1)
266 				break;
267 		}
268 		return;
269 	case BRIEFS:
270 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
271 			return;
272 		gotweb_render_page(c->tp, gotweb_render_briefs);
273 		return;
274 	case COMMITS:
275 		error = got_get_repo_commits(c, srv->max_commits_display);
276 		if (error) {
277 			log_warnx("%s: %s", __func__, error->msg);
278 			goto err;
279 		}
280 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
281 			return;
282 		gotweb_render_page(c->tp, gotweb_render_commits);
283 		return;
284 	case DIFF:
285 		error = got_get_repo_commits(c, 1);
286 		if (error) {
287 			log_warnx("%s: %s", __func__, error->msg);
288 			goto err;
289 		}
290 		error = got_open_diff_for_output(&c->t->fp, c);
291 		if (error) {
292 			log_warnx("%s: %s", __func__, error->msg);
293 			goto err;
294 		}
295 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
296 			return;
297 		gotweb_render_page(c->tp, gotweb_render_diff);
298 		return;
299 	case INDEX:
300 		c->t->nrepos = scandir(srv->repos_path, &c->t->repos, NULL,
301 		    alphasort);
302 		if (c->t->nrepos == -1) {
303 			c->t->repos = NULL;
304 			error = got_error_from_errno2("scandir",
305 			    srv->repos_path);
306 			goto err;
307 		}
308 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
309 			return;
310 		gotweb_render_page(c->tp, gotweb_render_index);
311 		return;
312 	case RSS:
313 		error = got_get_repo_tags(c, D_MAXSLCOMMDISP);
314 		if (error)
315 			goto err;
316 		if (gotweb_reply_file(c, rss_ctype, repo_dir->name, ".rss")
317 		    == -1)
318 			return;
319 		gotweb_render_rss(c->tp);
320 		return;
321 	case SUMMARY:
322 		error = got_ref_list(&c->t->refs, c->t->repo, "refs/heads",
323 		    got_ref_cmp_by_name, NULL);
324 		if (error) {
325 			log_warnx("%s: got_ref_list: %s", __func__,
326 			    error->msg);
327 			goto err;
328 		}
329 		qs->action = TAGS;
330 		error = got_get_repo_tags(c, D_MAXSLCOMMDISP);
331 		if (error) {
332 			log_warnx("%s: got_get_repo_tags: %s", __func__,
333 			    error->msg);
334 			goto err;
335 		}
336 		qs->action = SUMMARY;
337 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
338 			return;
339 		gotweb_render_page(c->tp, gotweb_render_summary);
340 		return;
341 	case TAG:
342 		error = got_get_repo_tags(c, 1);
343 		if (error) {
344 			log_warnx("%s: %s", __func__, error->msg);
345 			goto err;
346 		}
347 		if (c->t->tag_count == 0) {
348 			error = got_error_msg(GOT_ERR_BAD_OBJ_ID,
349 			    "bad commit id");
350 			goto err;
351 		}
352 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
353 			return;
354 		gotweb_render_page(c->tp, gotweb_render_tag);
355 		return;
356 	case TAGS:
357 		error = got_get_repo_tags(c, srv->max_commits_display);
358 		if (error) {
359 			log_warnx("%s: %s", __func__, error->msg);
360 			goto err;
361 		}
362 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
363 			return;
364 		gotweb_render_page(c->tp, gotweb_render_tags);
365 		return;
366 	case TREE:
367 		error = got_get_repo_commits(c, 1);
368 		if (error) {
369 			log_warnx("%s: %s", __func__, error->msg);
370 			goto err;
371 		}
372 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
373 			return;
374 		gotweb_render_page(c->tp, gotweb_render_tree);
375 		return;
376 	case ERR:
377 	default:
378 		error = got_error(GOT_ERR_BAD_QUERYSTRING);
379 	}
380 
381 err:
382 	c->t->error = error;
383 	if (gotweb_reply(c, 400, "text/html", NULL) == -1)
384 		return;
385 	gotweb_render_page(c->tp, gotweb_render_error);
386 }
387 
388 struct server *
389 gotweb_get_server(const char *server_name)
390 {
391 	struct server *srv;
392 
393 	/* check against the server name first */
394 	if (*server_name != '\0')
395 		TAILQ_FOREACH(srv, &gotwebd_env->servers, entry)
396 			if (strcmp(srv->name, server_name) == 0)
397 				return srv;
398 
399 	/* otherwise, use the first server */
400 	return TAILQ_FIRST(&gotwebd_env->servers);
401 };
402 
403 const struct got_error *
404 gotweb_init_transport(struct transport **t)
405 {
406 	const struct got_error *error = NULL;
407 
408 	*t = calloc(1, sizeof(**t));
409 	if (*t == NULL)
410 		return got_error_from_errno2(__func__, "calloc");
411 
412 	TAILQ_INIT(&(*t)->repo_commits);
413 	TAILQ_INIT(&(*t)->repo_tags);
414 	TAILQ_INIT(&(*t)->refs);
415 
416 	(*t)->fd = -1;
417 
418 	return error;
419 }
420 
421 static const struct got_error *
422 gotweb_init_querystring(struct querystring **qs)
423 {
424 	const struct got_error *error = NULL;
425 
426 	*qs = calloc(1, sizeof(**qs));
427 	if (*qs == NULL)
428 		return got_error_from_errno2(__func__, "calloc");
429 
430 	(*qs)->headref = strdup("HEAD");
431 	if ((*qs)->headref == NULL) {
432 		free(*qs);
433 		*qs = NULL;
434 		return got_error_from_errno2(__func__, "strdup");
435 	}
436 
437 	(*qs)->action = INDEX;
438 	(*qs)->commit = NULL;
439 	(*qs)->file = NULL;
440 	(*qs)->folder = NULL;
441 	(*qs)->index_page = 0;
442 	(*qs)->path = NULL;
443 
444 	return error;
445 }
446 
447 static const struct got_error *
448 gotweb_parse_querystring(struct querystring **qs, char *qst)
449 {
450 	const struct got_error *error = NULL;
451 	char *tok1 = NULL, *tok1_pair = NULL, *tok1_end = NULL;
452 	char *tok2 = NULL, *tok2_pair = NULL, *tok2_end = NULL;
453 
454 	if (qst == NULL)
455 		return error;
456 
457 	tok1 = strdup(qst);
458 	if (tok1 == NULL)
459 		return got_error_from_errno2(__func__, "strdup");
460 
461 	tok1_pair = tok1;
462 	tok1_end = tok1;
463 
464 	while (tok1_pair != NULL) {
465 		strsep(&tok1_end, "&");
466 
467 		tok2 = strdup(tok1_pair);
468 		if (tok2 == NULL) {
469 			free(tok1);
470 			return got_error_from_errno2(__func__, "strdup");
471 		}
472 
473 		tok2_pair = tok2;
474 		tok2_end = tok2;
475 
476 		while (tok2_pair != NULL) {
477 			strsep(&tok2_end, "=");
478 			if (tok2_end) {
479 				error = gotweb_assign_querystring(qs, tok2_pair,
480 				    tok2_end);
481 				if (error)
482 					goto err;
483 			}
484 			tok2_pair = tok2_end;
485 		}
486 		free(tok2);
487 		tok1_pair = tok1_end;
488 	}
489 	free(tok1);
490 	return error;
491 err:
492 	free(tok2);
493 	free(tok1);
494 	return error;
495 }
496 
497 /*
498  * Adapted from usr.sbin/httpd/httpd.c url_decode.
499  */
500 static const struct got_error *
501 gotweb_urldecode(char *url)
502 {
503 	char		*p, *q;
504 	char		 hex[3];
505 	unsigned long	 x;
506 
507 	hex[2] = '\0';
508 	p = q = url;
509 
510 	while (*p != '\0') {
511 		switch (*p) {
512 		case '%':
513 			/* Encoding character is followed by two hex chars */
514 			if (!isxdigit((unsigned char)p[1]) ||
515 			    !isxdigit((unsigned char)p[2]) ||
516 			    (p[1] == '0' && p[2] == '0'))
517 				return got_error(GOT_ERR_BAD_QUERYSTRING);
518 
519 			hex[0] = p[1];
520 			hex[1] = p[2];
521 
522 			/*
523 			 * We don't have to validate "hex" because it is
524 			 * guaranteed to include two hex chars followed by nul.
525 			 */
526 			x = strtoul(hex, NULL, 16);
527 			*q = (char)x;
528 			p += 2;
529 			break;
530 		default:
531 			*q = *p;
532 			break;
533 		}
534 		p++;
535 		q++;
536 	}
537 	*q = '\0';
538 
539 	return NULL;
540 }
541 
542 static const struct got_error *
543 gotweb_assign_querystring(struct querystring **qs, char *key, char *value)
544 {
545 	const struct got_error *error = NULL;
546 	const char *errstr;
547 	int a_cnt, el_cnt;
548 
549 	error = gotweb_urldecode(value);
550 	if (error)
551 		return error;
552 
553 	for (el_cnt = 0; el_cnt < QSELEM__MAX; el_cnt++) {
554 		if (strcmp(key, querystring_keys[el_cnt].name) != 0)
555 			continue;
556 
557 		switch (querystring_keys[el_cnt].element) {
558 		case ACTION:
559 			for (a_cnt = 0; a_cnt < ACTIONS__MAX; a_cnt++) {
560 				if (strcmp(value, action_keys[a_cnt].name) != 0)
561 					continue;
562 				else if (strcmp(value,
563 				    action_keys[a_cnt].name) == 0){
564 					(*qs)->action =
565 					    action_keys[a_cnt].action;
566 					goto qa_found;
567 				}
568 			}
569 			(*qs)->action = ERR;
570 qa_found:
571 			break;
572 		case COMMIT:
573 			(*qs)->commit = strdup(value);
574 			if ((*qs)->commit == NULL) {
575 				error = got_error_from_errno2(__func__,
576 				    "strdup");
577 				goto done;
578 			}
579 			break;
580 		case RFILE:
581 			(*qs)->file = strdup(value);
582 			if ((*qs)->file == NULL) {
583 				error = got_error_from_errno2(__func__,
584 				    "strdup");
585 				goto done;
586 			}
587 			break;
588 		case FOLDER:
589 			(*qs)->folder = strdup(value);
590 			if ((*qs)->folder == NULL) {
591 				error = got_error_from_errno2(__func__,
592 				    "strdup");
593 				goto done;
594 			}
595 			break;
596 		case HEADREF:
597 			free((*qs)->headref);
598 			(*qs)->headref = strdup(value);
599 			if ((*qs)->headref == NULL) {
600 				error = got_error_from_errno2(__func__,
601 				    "strdup");
602 				goto done;
603 			}
604 			break;
605 		case INDEX_PAGE:
606 			if (*value == '\0')
607 				break;
608 			(*qs)->index_page = strtonum(value, INT64_MIN,
609 			    INT64_MAX, &errstr);
610 			if (errstr) {
611 				error = got_error_from_errno3(__func__,
612 				    "strtonum", errstr);
613 				goto done;
614 			}
615 			if ((*qs)->index_page < 0)
616 				(*qs)->index_page = 0;
617 			break;
618 		case PATH:
619 			(*qs)->path = strdup(value);
620 			if ((*qs)->path == NULL) {
621 				error = got_error_from_errno2(__func__,
622 				    "strdup");
623 				goto done;
624 			}
625 			break;
626 		case PAGE:
627 			if (*value == '\0')
628 				break;
629 			(*qs)->page = strtonum(value, INT64_MIN,
630 			    INT64_MAX, &errstr);
631 			if (errstr) {
632 				error = got_error_from_errno3(__func__,
633 				    "strtonum", errstr);
634 				goto done;
635 			}
636 			if ((*qs)->page < 0)
637 				(*qs)->page = 0;
638 			break;
639 		default:
640 			break;
641 		}
642 	}
643 done:
644 	return error;
645 }
646 
647 void
648 gotweb_free_repo_tag(struct repo_tag *rt)
649 {
650 	if (rt != NULL) {
651 		free(rt->commit_id);
652 		free(rt->tag_name);
653 		free(rt->tag_commit);
654 		free(rt->commit_msg);
655 		free(rt->tagger);
656 	}
657 	free(rt);
658 }
659 
660 void
661 gotweb_free_repo_commit(struct repo_commit *rc)
662 {
663 	if (rc != NULL) {
664 		free(rc->path);
665 		free(rc->refs_str);
666 		free(rc->commit_id);
667 		free(rc->parent_id);
668 		free(rc->tree_id);
669 		free(rc->author);
670 		free(rc->committer);
671 		free(rc->commit_msg);
672 	}
673 	free(rc);
674 }
675 
676 static void
677 gotweb_free_querystring(struct querystring *qs)
678 {
679 	if (qs != NULL) {
680 		free(qs->commit);
681 		free(qs->file);
682 		free(qs->folder);
683 		free(qs->headref);
684 		free(qs->path);
685 	}
686 	free(qs);
687 }
688 
689 static void
690 gotweb_free_repo_dir(struct repo_dir *repo_dir)
691 {
692 	if (repo_dir != NULL) {
693 		free(repo_dir->name);
694 		free(repo_dir->owner);
695 		free(repo_dir->description);
696 		free(repo_dir->url);
697 		free(repo_dir->path);
698 	}
699 	free(repo_dir);
700 }
701 
702 void
703 gotweb_free_transport(struct transport *t)
704 {
705 	const struct got_error *err;
706 	struct repo_commit *rc = NULL, *trc = NULL;
707 	struct repo_tag *rt = NULL, *trt = NULL;
708 	int i;
709 
710 	got_ref_list_free(&t->refs);
711 	TAILQ_FOREACH_SAFE(rc, &t->repo_commits, entry, trc) {
712 		TAILQ_REMOVE(&t->repo_commits, rc, entry);
713 		gotweb_free_repo_commit(rc);
714 	}
715 	TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
716 		TAILQ_REMOVE(&t->repo_tags, rt, entry);
717 		gotweb_free_repo_tag(rt);
718 	}
719 	gotweb_free_repo_dir(t->repo_dir);
720 	gotweb_free_querystring(t->qs);
721 	free(t->more_id);
722 	free(t->next_id);
723 	free(t->prev_id);
724 	if (t->blob)
725 		got_object_blob_close(t->blob);
726 	if (t->fp) {
727 		err = got_gotweb_closefile(t->fp);
728 		if (err)
729 			log_warnx("%s: got_gotweb_closefile failure: %s",
730 			    __func__, err->msg);
731 	}
732 	if (t->fd != -1 && close(t->fd) == -1)
733 		log_warn("%s: close", __func__);
734 	if (t->repos) {
735 		for (i = 0; i < t->nrepos; ++i)
736 			free(t->repos[i]);
737 		free(t->repos);
738 	}
739 	free(t);
740 }
741 
742 void
743 gotweb_get_navs(struct request *c, struct gotweb_url *prev, int *have_prev,
744     struct gotweb_url *next, int *have_next)
745 {
746 	struct transport *t = c->t;
747 	struct querystring *qs = t->qs;
748 	struct server *srv = c->srv;
749 
750 	*have_prev = *have_next = 0;
751 
752 	switch(qs->action) {
753 	case INDEX:
754 		if (qs->index_page > 0) {
755 			*have_prev = 1;
756 			*prev = (struct gotweb_url){
757 				.action = -1,
758 				.index_page = qs->index_page - 1,
759 				.page = -1,
760 			};
761 		}
762 		if (t->next_disp == srv->max_repos_display &&
763 		    t->repos_total != (qs->index_page + 1) *
764 		    srv->max_repos_display) {
765 			*have_next = 1;
766 			*next = (struct gotweb_url){
767 				.action = -1,
768 				.index_page = qs->index_page + 1,
769 				.page = -1,
770 			};
771 		}
772 		break;
773 	case TAGS:
774 		if (t->prev_id && qs->commit != NULL &&
775 		    strcmp(qs->commit, t->prev_id) != 0) {
776 			*have_prev = 1;
777 			*prev = (struct gotweb_url){
778 				.action = TAGS,
779 				.index_page = -1,
780 				.page = qs->page - 1,
781 				.path = qs->path,
782 				.commit = t->prev_id,
783 				.headref = qs->headref,
784 			};
785 		}
786 		if (t->next_id) {
787 			*have_next = 1;
788 			*next = (struct gotweb_url){
789 				.action = TAGS,
790 				.index_page = -1,
791 				.page = qs->page + 1,
792 				.path = qs->path,
793 				.commit = t->next_id,
794 				.headref = qs->headref,
795 			};
796 		}
797 		break;
798 	}
799 }
800 
801 static int
802 gotweb_render_index(struct template *tp)
803 {
804 	const struct got_error *error = NULL;
805 	struct request *c = tp->tp_arg;
806 	struct server *srv = c->srv;
807 	struct transport *t = c->t;
808 	struct querystring *qs = t->qs;
809 	struct repo_dir *repo_dir = NULL;
810 	struct dirent **sd_dent = t->repos;
811 	unsigned int d_i, d_disp = 0;
812 	unsigned int d_skipped = 0;
813 	int type, r;
814 
815 	if (gotweb_render_repo_table_hdr(c->tp) == -1)
816 		return -1;
817 
818 	for (d_i = 0; d_i < t->nrepos; d_i++) {
819 		if (srv->max_repos > 0 && t->prev_disp == srv->max_repos)
820 			break;
821 
822 		if (strcmp(sd_dent[d_i]->d_name, ".") == 0 ||
823 		    strcmp(sd_dent[d_i]->d_name, "..") == 0) {
824 			d_skipped++;
825 			continue;
826 		}
827 
828 		error = got_path_dirent_type(&type, srv->repos_path,
829 		    sd_dent[d_i]);
830 		if (error)
831 			continue;
832 		if (type != DT_DIR) {
833 			d_skipped++;
834 			continue;
835 		}
836 
837 		if (qs->index_page > 0 && (qs->index_page *
838 		    srv->max_repos_display) > t->prev_disp) {
839 			t->prev_disp++;
840 			continue;
841 		}
842 
843 		error = gotweb_init_repo_dir(&repo_dir, sd_dent[d_i]->d_name);
844 		if (error)
845 			continue;
846 
847 		error = gotweb_load_got_path(c, repo_dir);
848 		if (error && error->code != GOT_ERR_LONELY_PACKIDX) {
849 			if (error->code != GOT_ERR_NOT_GIT_REPO)
850 				log_warnx("%s: %s: %s", __func__,
851 				    sd_dent[d_i]->d_name, error->msg);
852 			gotweb_free_repo_dir(repo_dir);
853 			repo_dir = NULL;
854 			d_skipped++;
855 			continue;
856 		}
857 
858 		d_disp++;
859 		t->prev_disp++;
860 
861 		r = gotweb_render_repo_fragment(c->tp, repo_dir);
862 		gotweb_free_repo_dir(repo_dir);
863 		if (r == -1)
864 			return -1;
865 
866 		t->next_disp++;
867 		if (d_disp == srv->max_repos_display)
868 			break;
869 	}
870 	t->repos_total = t->nrepos - d_skipped;
871 
872 	if (srv->max_repos_display == 0)
873 		return 0;
874 	if (srv->max_repos > 0 && srv->max_repos < srv->max_repos_display)
875 		return 0;
876 	if (t->repos_total <= srv->max_repos ||
877 	    t->repos_total <= srv->max_repos_display)
878 		return 0;
879 
880 	if (gotweb_render_navs(c->tp) == -1)
881 		return -1;
882 
883 	return 0;
884 }
885 
886 static inline int
887 should_urlencode(int c)
888 {
889 	if (c <= ' ' || c >= 127)
890 		return 1;
891 
892 	switch (c) {
893 		/* gen-delim */
894 	case ':':
895 	case '/':
896 	case '?':
897 	case '#':
898 	case '[':
899 	case ']':
900 	case '@':
901 		/* sub-delims */
902 	case '!':
903 	case '$':
904 	case '&':
905 	case '\'':
906 	case '(':
907 	case ')':
908 	case '*':
909 	case '+':
910 	case ',':
911 	case ';':
912 	case '=':
913 		/* needed because the URLs are embedded into the HTML */
914 	case '\"':
915 		return 1;
916 	default:
917 		return 0;
918 	}
919 }
920 
921 static char *
922 gotweb_urlencode(const char *str)
923 {
924 	const char *s;
925 	char *escaped;
926 	size_t i, len;
927 	int a, b;
928 
929 	len = 0;
930 	for (s = str; *s; ++s) {
931 		len++;
932 		if (should_urlencode(*s))
933 			len += 2;
934 	}
935 
936 	escaped = calloc(1, len + 1);
937 	if (escaped == NULL)
938 		return NULL;
939 
940 	i = 0;
941 	for (s = str; *s; ++s) {
942 		if (should_urlencode(*s)) {
943 			a = (*s & 0xF0) >> 4;
944 			b = (*s & 0x0F);
945 
946 			escaped[i++] = '%';
947 			escaped[i++] = a <= 9 ? ('0' + a) : ('7' + a);
948 			escaped[i++] = b <= 9 ? ('0' + b) : ('7' + b);
949 		} else
950 			escaped[i++] = *s;
951 	}
952 
953 	return escaped;
954 }
955 
956 const char *
957 gotweb_action_name(int action)
958 {
959 	switch (action) {
960 	case BLAME:
961 		return "blame";
962 	case BLOB:
963 		return "blob";
964 	case BLOBRAW:
965 		return "blobraw";
966 	case BRIEFS:
967 		return "briefs";
968 	case COMMITS:
969 		return "commits";
970 	case DIFF:
971 		return "diff";
972 	case ERR:
973 		return "err";
974 	case INDEX:
975 		return "index";
976 	case SUMMARY:
977 		return "summary";
978 	case TAG:
979 		return "tag";
980 	case TAGS:
981 		return "tags";
982 	case TREE:
983 		return "tree";
984 	case RSS:
985 		return "rss";
986 	default:
987 		return NULL;
988 	}
989 }
990 
991 int
992 gotweb_render_url(struct request *c, struct gotweb_url *url)
993 {
994 	const char *sep = "?", *action;
995 	char *tmp;
996 	int r;
997 
998 	action = gotweb_action_name(url->action);
999 	if (action != NULL) {
1000 		if (fcgi_printf(c, "?action=%s", action) == -1)
1001 			return -1;
1002 		sep = "&";
1003 	}
1004 
1005 	if (url->commit) {
1006 		if (fcgi_printf(c, "%scommit=%s", sep, url->commit) == -1)
1007 			return -1;
1008 		sep = "&";
1009 	}
1010 
1011 	if (url->previd) {
1012 		if (fcgi_printf(c, "%sprevid=%s", sep, url->previd) == -1)
1013 			return -1;
1014 		sep = "&";
1015 	}
1016 
1017 	if (url->prevset) {
1018 		if (fcgi_printf(c, "%sprevset=%s", sep, url->prevset) == -1)
1019 			return -1;
1020 		sep = "&";
1021 	}
1022 
1023 	if (url->file) {
1024 		tmp = gotweb_urlencode(url->file);
1025 		if (tmp == NULL)
1026 			return -1;
1027 		r = fcgi_printf(c, "%sfile=%s", sep, tmp);
1028 		free(tmp);
1029 		if (r == -1)
1030 			return -1;
1031 		sep = "&";
1032 	}
1033 
1034 	if (url->folder) {
1035 		tmp = gotweb_urlencode(url->folder);
1036 		if (tmp == NULL)
1037 			return -1;
1038 		r = fcgi_printf(c, "%sfolder=%s", sep, tmp);
1039 		free(tmp);
1040 		if (r == -1)
1041 			return -1;
1042 		sep = "&";
1043 	}
1044 
1045 	if (url->headref) {
1046 		tmp = gotweb_urlencode(url->headref);
1047 		if (tmp == NULL)
1048 			return -1;
1049 		r = fcgi_printf(c, "%sheadref=%s", sep, url->headref);
1050 		free(tmp);
1051 		if (r == -1)
1052 			return -1;
1053 		sep = "&";
1054 	}
1055 
1056 	if (url->index_page != -1) {
1057 		if (fcgi_printf(c, "%sindex_page=%d", sep,
1058 		    url->index_page) == -1)
1059 			return -1;
1060 		sep = "&";
1061 	}
1062 
1063 	if (url->path) {
1064 		tmp = gotweb_urlencode(url->path);
1065 		if (tmp == NULL)
1066 			return -1;
1067 		r = fcgi_printf(c, "%spath=%s", sep, tmp);
1068 		free(tmp);
1069 		if (r == -1)
1070 			return -1;
1071 		sep = "&";
1072 	}
1073 
1074 	if (url->page != -1) {
1075 		if (fcgi_printf(c, "%spage=%d", sep, url->page) == -1)
1076 			return -1;
1077 		sep = "&";
1078 	}
1079 
1080 	return 0;
1081 }
1082 
1083 int
1084 gotweb_render_absolute_url(struct request *c, struct gotweb_url *url)
1085 {
1086 	struct template	*tp = c->tp;
1087 	const char	*proto = c->https ? "https" : "http";
1088 
1089 	if (fcgi_puts(tp, proto) == -1 ||
1090 	    fcgi_puts(tp, "://") == -1 ||
1091 	    tp_htmlescape(tp, c->server_name) == -1 ||
1092 	    tp_htmlescape(tp, c->document_uri) == -1)
1093 		return -1;
1094 
1095 	return gotweb_render_url(c, url);
1096 }
1097 
1098 static struct got_repository *
1099 find_cached_repo(struct server *srv, const char *path)
1100 {
1101 	int i;
1102 
1103 	for (i = 0; i < srv->ncached_repos; i++) {
1104 		if (strcmp(srv->cached_repos[i].path, path) == 0)
1105 			return srv->cached_repos[i].repo;
1106 	}
1107 
1108 	return NULL;
1109 }
1110 
1111 static const struct got_error *
1112 cache_repo(struct got_repository **new, struct server *srv,
1113     struct repo_dir *repo_dir, struct socket *sock)
1114 {
1115 	const struct got_error *error = NULL;
1116 	struct got_repository *repo;
1117 	struct cached_repo *cr;
1118 	int evicted = 0;
1119 
1120 	if (srv->ncached_repos >= GOTWEBD_REPO_CACHESIZE) {
1121 		cr = &srv->cached_repos[srv->ncached_repos - 1];
1122 		error = got_repo_close(cr->repo);
1123 		memset(cr, 0, sizeof(*cr));
1124 		srv->ncached_repos--;
1125 		if (error)
1126 			return error;
1127 		memmove(&srv->cached_repos[1], &srv->cached_repos[0],
1128 		    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1129 		cr = &srv->cached_repos[0];
1130 		evicted = 1;
1131 	} else {
1132 		cr = &srv->cached_repos[srv->ncached_repos];
1133 	}
1134 
1135 	error = got_repo_open(&repo, repo_dir->path, NULL, sock->pack_fds);
1136 	if (error) {
1137 		if (evicted) {
1138 			memmove(&srv->cached_repos[0], &srv->cached_repos[1],
1139 			    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1140 		}
1141 		return error;
1142 	}
1143 
1144 	if (strlcpy(cr->path, repo_dir->path, sizeof(cr->path))
1145 	    >= sizeof(cr->path)) {
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 got_error(GOT_ERR_NO_SPACE);
1151 	}
1152 
1153 	cr->repo = repo;
1154 	srv->ncached_repos++;
1155 	*new = repo;
1156 	return NULL;
1157 }
1158 
1159 static const struct got_error *
1160 gotweb_load_got_path(struct request *c, struct repo_dir *repo_dir)
1161 {
1162 	const struct got_error *error = NULL;
1163 	struct socket *sock = c->sock;
1164 	struct server *srv = c->srv;
1165 	struct transport *t = c->t;
1166 	struct got_repository *repo = NULL;
1167 	DIR *dt;
1168 	char *dir_test;
1169 
1170 	if (asprintf(&dir_test, "%s/%s/%s", srv->repos_path, repo_dir->name,
1171 	    GOTWEB_GIT_DIR) == -1)
1172 		return got_error_from_errno("asprintf");
1173 
1174 	dt = opendir(dir_test);
1175 	if (dt == NULL) {
1176 		free(dir_test);
1177 	} else {
1178 		repo_dir->path = dir_test;
1179 		dir_test = NULL;
1180 		goto done;
1181 	}
1182 
1183 	if (asprintf(&dir_test, "%s/%s", srv->repos_path,
1184 	    repo_dir->name) == -1)
1185 		return got_error_from_errno("asprintf");
1186 
1187 	dt = opendir(dir_test);
1188 	if (dt == NULL) {
1189 		error = got_error_path(repo_dir->name, GOT_ERR_NOT_GIT_REPO);
1190 		goto err;
1191 	} else {
1192 		repo_dir->path = dir_test;
1193 		dir_test = NULL;
1194 	}
1195 
1196 done:
1197 	if (srv->respect_exportok &&
1198 	    faccessat(dirfd(dt), "git-daemon-export-ok", F_OK, 0) == -1) {
1199 		error = got_error_path(repo_dir->name, GOT_ERR_NOT_GIT_REPO);
1200 		goto err;
1201 	}
1202 
1203 	repo = find_cached_repo(srv, repo_dir->path);
1204 	if (repo == NULL) {
1205 		error = cache_repo(&repo, srv, repo_dir, sock);
1206 		if (error)
1207 			goto err;
1208 	}
1209 	t->repo = repo;
1210 	error = gotweb_get_repo_description(&repo_dir->description, srv,
1211 	    repo_dir->path, dirfd(dt));
1212 	if (error)
1213 		goto err;
1214 	error = got_get_repo_owner(&repo_dir->owner, c);
1215 	if (error)
1216 		goto err;
1217 	error = got_get_repo_age(&repo_dir->age, c, NULL);
1218 	if (error)
1219 		goto err;
1220 	error = gotweb_get_clone_url(&repo_dir->url, srv, repo_dir->path,
1221 	    dirfd(dt));
1222 err:
1223 	free(dir_test);
1224 	if (dt != NULL && closedir(dt) == EOF && error == NULL)
1225 		error = got_error_from_errno("closedir");
1226 	return error;
1227 }
1228 
1229 static const struct got_error *
1230 gotweb_init_repo_dir(struct repo_dir **repo_dir, const char *dir)
1231 {
1232 	const struct got_error *error;
1233 
1234 	*repo_dir = calloc(1, sizeof(**repo_dir));
1235 	if (*repo_dir == NULL)
1236 		return got_error_from_errno("calloc");
1237 
1238 	if (asprintf(&(*repo_dir)->name, "%s", dir) == -1) {
1239 		error = got_error_from_errno("asprintf");
1240 		free(*repo_dir);
1241 		*repo_dir = NULL;
1242 		return error;
1243 	}
1244 	(*repo_dir)->owner = NULL;
1245 	(*repo_dir)->description = NULL;
1246 	(*repo_dir)->url = NULL;
1247 	(*repo_dir)->path = NULL;
1248 
1249 	return NULL;
1250 }
1251 
1252 static const struct got_error *
1253 gotweb_get_repo_description(char **description, struct server *srv,
1254     const char *dirpath, int dir)
1255 {
1256 	const struct got_error *error = NULL;
1257 	struct stat sb;
1258 	int fd = -1;
1259 	off_t len;
1260 
1261 	*description = NULL;
1262 	if (srv->show_repo_description == 0)
1263 		return NULL;
1264 
1265 	fd = openat(dir, "description", O_RDONLY);
1266 	if (fd == -1) {
1267 		if (errno != ENOENT && errno != EACCES) {
1268 			error = got_error_from_errno_fmt("openat %s/%s",
1269 			    dirpath, "description");
1270 		}
1271 		goto done;
1272 	}
1273 
1274 	if (fstat(fd, &sb) == -1) {
1275 		error = got_error_from_errno_fmt("fstat %s/%s",
1276 		    dirpath, "description");
1277 		goto done;
1278 	}
1279 
1280 	len = sb.st_size;
1281 	if (len > GOTWEBD_MAXDESCRSZ - 1)
1282 		len = GOTWEBD_MAXDESCRSZ - 1;
1283 
1284 	*description = calloc(len + 1, sizeof(**description));
1285 	if (*description == NULL) {
1286 		error = got_error_from_errno("calloc");
1287 		goto done;
1288 	}
1289 
1290 	if (read(fd, *description, len) == -1)
1291 		error = got_error_from_errno("read");
1292 done:
1293 	if (fd != -1 && close(fd) == -1 && error == NULL)
1294 		error = got_error_from_errno("close");
1295 	return error;
1296 }
1297 
1298 static const struct got_error *
1299 gotweb_get_clone_url(char **url, struct server *srv, const char *dirpath,
1300     int dir)
1301 {
1302 	const struct got_error *error = NULL;
1303 	struct stat sb;
1304 	int fd = -1;
1305 	off_t len;
1306 
1307 	*url = NULL;
1308 	if (srv->show_repo_cloneurl == 0)
1309 		return NULL;
1310 
1311 	fd = openat(dir, "cloneurl", O_RDONLY);
1312 	if (fd == -1) {
1313 		if (errno != ENOENT && errno != EACCES) {
1314 			error = got_error_from_errno_fmt("openat %s/%s",
1315 			    dirpath, "cloneurl");
1316 		}
1317 		goto done;
1318 	}
1319 
1320 	if (fstat(fd, &sb) == -1) {
1321 		error = got_error_from_errno_fmt("fstat %s/%s",
1322 		    dirpath, "cloneurl");
1323 		goto done;
1324 	}
1325 
1326 	len = sb.st_size;
1327 	if (len > GOTWEBD_MAXCLONEURLSZ - 1)
1328 		len = GOTWEBD_MAXCLONEURLSZ - 1;
1329 
1330 	*url = calloc(len + 1, sizeof(**url));
1331 	if (*url == NULL) {
1332 		error = got_error_from_errno("calloc");
1333 		goto done;
1334 	}
1335 
1336 	if (read(fd, *url, len) == -1)
1337 		error = got_error_from_errno("read");
1338 done:
1339 	if (fd != -1 && close(fd) == -1 && error == NULL)
1340 		error = got_error_from_errno("close");
1341 	return error;
1342 }
1343 
1344 int
1345 gotweb_render_age(struct template *tp, time_t committer_time, int ref_tm)
1346 {
1347 	struct request *c = tp->tp_arg;
1348 	struct tm tm;
1349 	long long diff_time;
1350 	const char *years = "years ago", *months = "months ago";
1351 	const char *weeks = "weeks ago", *days = "days ago";
1352 	const char *hours = "hours ago",  *minutes = "minutes ago";
1353 	const char *seconds = "seconds ago", *now = "right now";
1354 	char *s;
1355 	char datebuf[64];
1356 	size_t r;
1357 
1358 	switch (ref_tm) {
1359 	case TM_DIFF:
1360 		diff_time = time(NULL) - committer_time;
1361 		if (diff_time > 60 * 60 * 24 * 365 * 2) {
1362 			if (fcgi_printf(c, "%lld %s",
1363 			    (diff_time / 60 / 60 / 24 / 365), years) == -1)
1364 				return -1;
1365 		} else if (diff_time > 60 * 60 * 24 * (365 / 12) * 2) {
1366 			if (fcgi_printf(c, "%lld %s",
1367 			    (diff_time / 60 / 60 / 24 / (365 / 12)),
1368 			    months) == -1)
1369 				return -1;
1370 		} else if (diff_time > 60 * 60 * 24 * 7 * 2) {
1371 			if (fcgi_printf(c, "%lld %s",
1372 			    (diff_time / 60 / 60 / 24 / 7), weeks) == -1)
1373 				return -1;
1374 		} else if (diff_time > 60 * 60 * 24 * 2) {
1375 			if (fcgi_printf(c, "%lld %s",
1376 			    (diff_time / 60 / 60 / 24), days) == -1)
1377 				return -1;
1378 		} else if (diff_time > 60 * 60 * 2) {
1379 			if (fcgi_printf(c, "%lld %s",
1380 			    (diff_time / 60 / 60), hours) == -1)
1381 				return -1;
1382 		} else if (diff_time > 60 * 2) {
1383 			if (fcgi_printf(c, "%lld %s", (diff_time / 60),
1384 			    minutes) == -1)
1385 				return -1;
1386 		} else if (diff_time > 2) {
1387 			if (fcgi_printf(c, "%lld %s", diff_time,
1388 			    seconds) == -1)
1389 				return -1;
1390 		} else {
1391 			if (fcgi_puts(tp, now) == -1)
1392 				return -1;
1393 		}
1394 		break;
1395 	case TM_LONG:
1396 		if (gmtime_r(&committer_time, &tm) == NULL)
1397 			return -1;
1398 
1399 		s = asctime_r(&tm, datebuf);
1400 		if (s == NULL)
1401 			return -1;
1402 
1403 		if (fcgi_puts(tp, datebuf) == -1 ||
1404 		    fcgi_puts(tp, " UTC") == -1)
1405 			return -1;
1406 		break;
1407 	case TM_RFC822:
1408 		if (gmtime_r(&committer_time, &tm) == NULL)
1409 			return -1;
1410 
1411 		r = strftime(datebuf, sizeof(datebuf),
1412 		    "%a, %d %b %Y %H:%M:%S GMT", &tm);
1413 		if (r == 0)
1414 			return -1;
1415 
1416 		if (fcgi_puts(tp, datebuf) == -1)
1417 			return -1;
1418 		break;
1419 	}
1420 	return 0;
1421 }