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 "proc.h"
53 #include "gotwebd.h"
54 #include "tmpl.h"
55 
56 static const struct querystring_keys querystring_keys[] = {
57 	{ "action",		ACTION },
58 	{ "commit",		COMMIT },
59 	{ "file",		RFILE },
60 	{ "folder",		FOLDER },
61 	{ "headref",		HEADREF },
62 	{ "index_page",		INDEX_PAGE },
63 	{ "path",		PATH },
64 	{ "page",		PAGE },
65 };
66 
67 static const struct action_keys action_keys[] = {
68 	{ "blame",	BLAME },
69 	{ "blob",	BLOB },
70 	{ "blobraw",	BLOBRAW },
71 	{ "briefs",	BRIEFS },
72 	{ "commits",	COMMITS },
73 	{ "diff",	DIFF },
74 	{ "error",	ERR },
75 	{ "index",	INDEX },
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 && fcgi_printf(c, "Status: %d\r\n", status) == -1)
110 		return -1;
111 
112 	if (location) {
113 		if (fcgi_puts(c->tp, "Location: ") == -1 ||
114 		    gotweb_render_url(c, location) == -1 ||
115 		    fcgi_puts(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 (fcgi_puts(c->tp, csp) == -1)
122 		return -1;
123 
124 	if (ctype && fcgi_printf(c, "Content-Type: %s\r\n", ctype) == -1)
125 		return -1;
126 
127 	return fcgi_puts(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 = fcgi_printf(c, "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 		if (qs->commit == NULL) {
193 			error = got_error(GOT_ERR_BAD_QUERYSTRING);
194 			goto err;
195 		}
196 	}
197 
198 	if (qs->action != INDEX) {
199 		error = gotweb_init_repo_dir(&repo_dir, qs->path);
200 		if (error)
201 			goto err;
202 		error = gotweb_load_got_path(c, repo_dir);
203 		c->t->repo_dir = repo_dir;
204 		if (error && error->code != GOT_ERR_LONELY_PACKIDX)
205 			goto err;
206 	}
207 
208 	if (qs->action == BLOBRAW || qs->action == BLOB) {
209 		error = got_get_repo_commits(c, 1);
210 		if (error)
211 			goto err;
212 
213 		error = got_open_blob_for_output(&c->t->blob, &c->t->fd,
214 		    &binary, c);
215 		if (error)
216 			goto err;
217 	}
218 
219 	switch(qs->action) {
220 	case BLAME:
221 		error = got_get_repo_commits(c, 1);
222 		if (error) {
223 			log_warnx("%s: %s", __func__, error->msg);
224 			goto err;
225 		}
226 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
227 			return;
228 		gotweb_render_page(c->tp, gotweb_render_blame);
229 		return;
230 	case BLOB:
231 		if (binary) {
232 			struct gotweb_url url = {
233 				.index_page = -1,
234 				.page = -1,
235 				.action = BLOBRAW,
236 				.path = qs->path,
237 				.commit = qs->commit,
238 				.folder = qs->folder,
239 				.file = qs->file,
240 			};
241 
242 			gotweb_reply(c, 302, NULL, &url);
243 			return;
244 		}
245 
246 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
247 			return;
248 		gotweb_render_page(c->tp, gotweb_render_blob);
249 		return;
250 	case BLOBRAW:
251 		if (binary)
252 			r = gotweb_reply_file(c, "application/octet-stream",
253 			    qs->file, NULL);
254 		else
255 			r = gotweb_reply(c, 200, "text/plain", NULL);
256 		if (r == -1)
257 			return;
258 
259 		for (;;) {
260 			error = got_object_blob_read_block(&len, c->t->blob);
261 			if (error)
262 				break;
263 			if (len == 0)
264 				break;
265 			buf = got_object_blob_get_read_buf(c->t->blob);
266 			if (fcgi_gen_binary_response(c, buf, len) == -1)
267 				break;
268 		}
269 		return;
270 	case BRIEFS:
271 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
272 			return;
273 		gotweb_render_page(c->tp, gotweb_render_briefs);
274 		return;
275 	case COMMITS:
276 		error = got_get_repo_commits(c, srv->max_commits_display);
277 		if (error) {
278 			log_warnx("%s: %s", __func__, error->msg);
279 			goto err;
280 		}
281 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
282 			return;
283 		gotweb_render_page(c->tp, gotweb_render_commits);
284 		return;
285 	case DIFF:
286 		error = got_get_repo_commits(c, 1);
287 		if (error) {
288 			log_warnx("%s: %s", __func__, error->msg);
289 			goto err;
290 		}
291 		error = got_open_diff_for_output(&c->t->fp, c);
292 		if (error) {
293 			log_warnx("%s: %s", __func__, error->msg);
294 			goto err;
295 		}
296 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
297 			return;
298 		gotweb_render_page(c->tp, gotweb_render_diff);
299 		return;
300 	case INDEX:
301 		c->t->nrepos = scandir(srv->repos_path, &c->t->repos, NULL,
302 		    alphasort);
303 		if (c->t->nrepos == -1) {
304 			c->t->repos = NULL;
305 			error = got_error_from_errno2("scandir",
306 			    srv->repos_path);
307 			goto err;
308 		}
309 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
310 			return;
311 		gotweb_render_page(c->tp, gotweb_render_index);
312 		return;
313 	case RSS:
314 		error = got_get_repo_tags(c, D_MAXSLCOMMDISP);
315 		if (error)
316 			goto err;
317 		if (gotweb_reply_file(c, rss_ctype, repo_dir->name, ".rss")
318 		    == -1)
319 			return;
320 		gotweb_render_rss(c->tp);
321 		return;
322 	case SUMMARY:
323 		error = got_ref_list(&c->t->refs, c->t->repo, "refs/heads",
324 		    got_ref_cmp_by_name, NULL);
325 		if (error) {
326 			log_warnx("%s: got_ref_list: %s", __func__,
327 			    error->msg);
328 			goto err;
329 		}
330 		qs->action = TAGS;
331 		error = got_get_repo_tags(c, D_MAXSLCOMMDISP);
332 		if (error) {
333 			log_warnx("%s: got_get_repo_tags: %s", __func__,
334 			    error->msg);
335 			goto err;
336 		}
337 		qs->action = SUMMARY;
338 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
339 			return;
340 		gotweb_render_page(c->tp, gotweb_render_summary);
341 		return;
342 	case TAG:
343 		error = got_get_repo_tags(c, 1);
344 		if (error) {
345 			log_warnx("%s: %s", __func__, error->msg);
346 			goto err;
347 		}
348 		if (c->t->tag_count == 0) {
349 			error = got_error_msg(GOT_ERR_BAD_OBJ_ID,
350 			    "bad commit id");
351 			goto err;
352 		}
353 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
354 			return;
355 		gotweb_render_page(c->tp, gotweb_render_tag);
356 		return;
357 	case TAGS:
358 		error = got_get_repo_tags(c, srv->max_commits_display);
359 		if (error) {
360 			log_warnx("%s: %s", __func__, error->msg);
361 			goto err;
362 		}
363 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
364 			return;
365 		gotweb_render_page(c->tp, gotweb_render_tags);
366 		return;
367 	case TREE:
368 		error = got_get_repo_commits(c, 1);
369 		if (error) {
370 			log_warnx("%s: %s", __func__, error->msg);
371 			goto err;
372 		}
373 		if (gotweb_reply(c, 200, "text/html", NULL) == -1)
374 			return;
375 		gotweb_render_page(c->tp, gotweb_render_tree);
376 		return;
377 	case ERR:
378 	default:
379 		error = got_error(GOT_ERR_BAD_QUERYSTRING);
380 	}
381 
382 err:
383 	c->t->error = error;
384 	if (gotweb_reply(c, 400, "text/html", NULL) == -1)
385 		return;
386 	gotweb_render_page(c->tp, gotweb_render_error);
387 }
388 
389 struct server *
390 gotweb_get_server(const char *server_name)
391 {
392 	struct server *srv;
393 
394 	/* check against the server name first */
395 	if (*server_name != '\0')
396 		TAILQ_FOREACH(srv, &gotwebd_env->servers, entry)
397 			if (strcmp(srv->name, server_name) == 0)
398 				return srv;
399 
400 	/* otherwise, use the first server */
401 	return TAILQ_FIRST(&gotwebd_env->servers);
402 };
403 
404 const struct got_error *
405 gotweb_init_transport(struct transport **t)
406 {
407 	const struct got_error *error = NULL;
408 
409 	*t = calloc(1, sizeof(**t));
410 	if (*t == NULL)
411 		return got_error_from_errno2(__func__, "calloc");
412 
413 	TAILQ_INIT(&(*t)->repo_commits);
414 	TAILQ_INIT(&(*t)->repo_tags);
415 	TAILQ_INIT(&(*t)->refs);
416 
417 	(*t)->fd = -1;
418 
419 	return error;
420 }
421 
422 static const struct got_error *
423 gotweb_init_querystring(struct querystring **qs)
424 {
425 	const struct got_error *error = NULL;
426 
427 	*qs = calloc(1, sizeof(**qs));
428 	if (*qs == NULL)
429 		return got_error_from_errno2(__func__, "calloc");
430 
431 	(*qs)->headref = strdup("HEAD");
432 	if ((*qs)->headref == NULL) {
433 		free(*qs);
434 		*qs = NULL;
435 		return got_error_from_errno2(__func__, "strdup");
436 	}
437 
438 	(*qs)->action = INDEX;
439 	(*qs)->commit = NULL;
440 	(*qs)->file = NULL;
441 	(*qs)->folder = NULL;
442 	(*qs)->index_page = 0;
443 	(*qs)->path = NULL;
444 
445 	return error;
446 }
447 
448 static const struct got_error *
449 gotweb_parse_querystring(struct querystring **qs, char *qst)
450 {
451 	const struct got_error *error = NULL;
452 	char *tok1 = NULL, *tok1_pair = NULL, *tok1_end = NULL;
453 	char *tok2 = NULL, *tok2_pair = NULL, *tok2_end = NULL;
454 
455 	if (qst == NULL)
456 		return error;
457 
458 	tok1 = strdup(qst);
459 	if (tok1 == NULL)
460 		return got_error_from_errno2(__func__, "strdup");
461 
462 	tok1_pair = tok1;
463 	tok1_end = tok1;
464 
465 	while (tok1_pair != NULL) {
466 		strsep(&tok1_end, "&");
467 
468 		tok2 = strdup(tok1_pair);
469 		if (tok2 == NULL) {
470 			free(tok1);
471 			return got_error_from_errno2(__func__, "strdup");
472 		}
473 
474 		tok2_pair = tok2;
475 		tok2_end = tok2;
476 
477 		while (tok2_pair != NULL) {
478 			strsep(&tok2_end, "=");
479 			if (tok2_end) {
480 				error = gotweb_assign_querystring(qs, tok2_pair,
481 				    tok2_end);
482 				if (error)
483 					goto err;
484 			}
485 			tok2_pair = tok2_end;
486 		}
487 		free(tok2);
488 		tok1_pair = tok1_end;
489 	}
490 	free(tok1);
491 	return error;
492 err:
493 	free(tok2);
494 	free(tok1);
495 	return error;
496 }
497 
498 /*
499  * Adapted from usr.sbin/httpd/httpd.c url_decode.
500  */
501 static const struct got_error *
502 gotweb_urldecode(char *url)
503 {
504 	char		*p, *q;
505 	char		 hex[3];
506 	unsigned long	 x;
507 
508 	hex[2] = '\0';
509 	p = q = url;
510 
511 	while (*p != '\0') {
512 		switch (*p) {
513 		case '%':
514 			/* Encoding character is followed by two hex chars */
515 			if (!isxdigit((unsigned char)p[1]) ||
516 			    !isxdigit((unsigned char)p[2]) ||
517 			    (p[1] == '0' && p[2] == '0'))
518 				return got_error(GOT_ERR_BAD_QUERYSTRING);
519 
520 			hex[0] = p[1];
521 			hex[1] = p[2];
522 
523 			/*
524 			 * We don't have to validate "hex" because it is
525 			 * guaranteed to include two hex chars followed by nul.
526 			 */
527 			x = strtoul(hex, NULL, 16);
528 			*q = (char)x;
529 			p += 2;
530 			break;
531 		default:
532 			*q = *p;
533 			break;
534 		}
535 		p++;
536 		q++;
537 	}
538 	*q = '\0';
539 
540 	return NULL;
541 }
542 
543 static const struct got_error *
544 gotweb_assign_querystring(struct querystring **qs, char *key, char *value)
545 {
546 	const struct got_error *error = NULL;
547 	const char *errstr;
548 	int a_cnt, el_cnt;
549 
550 	error = gotweb_urldecode(value);
551 	if (error)
552 		return error;
553 
554 	for (el_cnt = 0; el_cnt < QSELEM__MAX; el_cnt++) {
555 		if (strcmp(key, querystring_keys[el_cnt].name) != 0)
556 			continue;
557 
558 		switch (querystring_keys[el_cnt].element) {
559 		case ACTION:
560 			for (a_cnt = 0; a_cnt < ACTIONS__MAX; a_cnt++) {
561 				if (strcmp(value, action_keys[a_cnt].name) != 0)
562 					continue;
563 				else if (strcmp(value,
564 				    action_keys[a_cnt].name) == 0){
565 					(*qs)->action =
566 					    action_keys[a_cnt].action;
567 					goto qa_found;
568 				}
569 			}
570 			(*qs)->action = ERR;
571 qa_found:
572 			break;
573 		case COMMIT:
574 			(*qs)->commit = strdup(value);
575 			if ((*qs)->commit == NULL) {
576 				error = got_error_from_errno2(__func__,
577 				    "strdup");
578 				goto done;
579 			}
580 			break;
581 		case RFILE:
582 			(*qs)->file = strdup(value);
583 			if ((*qs)->file == NULL) {
584 				error = got_error_from_errno2(__func__,
585 				    "strdup");
586 				goto done;
587 			}
588 			break;
589 		case FOLDER:
590 			(*qs)->folder = strdup(value);
591 			if ((*qs)->folder == NULL) {
592 				error = got_error_from_errno2(__func__,
593 				    "strdup");
594 				goto done;
595 			}
596 			break;
597 		case HEADREF:
598 			free((*qs)->headref);
599 			(*qs)->headref = strdup(value);
600 			if ((*qs)->headref == NULL) {
601 				error = got_error_from_errno2(__func__,
602 				    "strdup");
603 				goto done;
604 			}
605 			break;
606 		case INDEX_PAGE:
607 			if (*value == '\0')
608 				break;
609 			(*qs)->index_page = strtonum(value, INT64_MIN,
610 			    INT64_MAX, &errstr);
611 			if (errstr) {
612 				error = got_error_from_errno3(__func__,
613 				    "strtonum", errstr);
614 				goto done;
615 			}
616 			if ((*qs)->index_page < 0)
617 				(*qs)->index_page = 0;
618 			break;
619 		case PATH:
620 			(*qs)->path = strdup(value);
621 			if ((*qs)->path == NULL) {
622 				error = got_error_from_errno2(__func__,
623 				    "strdup");
624 				goto done;
625 			}
626 			break;
627 		case PAGE:
628 			if (*value == '\0')
629 				break;
630 			(*qs)->page = strtonum(value, INT64_MIN,
631 			    INT64_MAX, &errstr);
632 			if (errstr) {
633 				error = got_error_from_errno3(__func__,
634 				    "strtonum", errstr);
635 				goto done;
636 			}
637 			if ((*qs)->page < 0)
638 				(*qs)->page = 0;
639 			break;
640 		default:
641 			break;
642 		}
643 	}
644 done:
645 	return error;
646 }
647 
648 void
649 gotweb_free_repo_tag(struct repo_tag *rt)
650 {
651 	if (rt != NULL) {
652 		free(rt->commit_id);
653 		free(rt->tag_name);
654 		free(rt->tag_commit);
655 		free(rt->commit_msg);
656 		free(rt->tagger);
657 	}
658 	free(rt);
659 }
660 
661 void
662 gotweb_free_repo_commit(struct repo_commit *rc)
663 {
664 	if (rc != NULL) {
665 		free(rc->path);
666 		free(rc->refs_str);
667 		free(rc->commit_id);
668 		free(rc->parent_id);
669 		free(rc->tree_id);
670 		free(rc->author);
671 		free(rc->committer);
672 		free(rc->commit_msg);
673 	}
674 	free(rc);
675 }
676 
677 static void
678 gotweb_free_querystring(struct querystring *qs)
679 {
680 	if (qs != NULL) {
681 		free(qs->commit);
682 		free(qs->file);
683 		free(qs->folder);
684 		free(qs->headref);
685 		free(qs->path);
686 	}
687 	free(qs);
688 }
689 
690 static void
691 gotweb_free_repo_dir(struct repo_dir *repo_dir)
692 {
693 	if (repo_dir != NULL) {
694 		free(repo_dir->name);
695 		free(repo_dir->owner);
696 		free(repo_dir->description);
697 		free(repo_dir->url);
698 		free(repo_dir->path);
699 	}
700 	free(repo_dir);
701 }
702 
703 void
704 gotweb_free_transport(struct transport *t)
705 {
706 	const struct got_error *err;
707 	struct repo_commit *rc = NULL, *trc = NULL;
708 	struct repo_tag *rt = NULL, *trt = NULL;
709 	int i;
710 
711 	got_ref_list_free(&t->refs);
712 	TAILQ_FOREACH_SAFE(rc, &t->repo_commits, entry, trc) {
713 		TAILQ_REMOVE(&t->repo_commits, rc, entry);
714 		gotweb_free_repo_commit(rc);
715 	}
716 	TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
717 		TAILQ_REMOVE(&t->repo_tags, rt, entry);
718 		gotweb_free_repo_tag(rt);
719 	}
720 	gotweb_free_repo_dir(t->repo_dir);
721 	gotweb_free_querystring(t->qs);
722 	free(t->more_id);
723 	free(t->next_id);
724 	free(t->prev_id);
725 	if (t->blob)
726 		got_object_blob_close(t->blob);
727 	if (t->fp) {
728 		err = got_gotweb_closefile(t->fp);
729 		if (err)
730 			log_warnx("%s: got_gotweb_closefile failure: %s",
731 			    __func__, err->msg);
732 	}
733 	if (t->fd != -1 && close(t->fd) == -1)
734 		log_warn("%s: close", __func__);
735 	if (t->repos) {
736 		for (i = 0; i < t->nrepos; ++i)
737 			free(t->repos[i]);
738 		free(t->repos);
739 	}
740 	free(t);
741 }
742 
743 void
744 gotweb_get_navs(struct request *c, struct gotweb_url *prev, int *have_prev,
745     struct gotweb_url *next, int *have_next)
746 {
747 	struct transport *t = c->t;
748 	struct querystring *qs = t->qs;
749 	struct server *srv = c->srv;
750 
751 	*have_prev = *have_next = 0;
752 
753 	switch(qs->action) {
754 	case INDEX:
755 		if (qs->index_page > 0) {
756 			*have_prev = 1;
757 			*prev = (struct gotweb_url){
758 				.action = -1,
759 				.index_page = qs->index_page - 1,
760 				.page = -1,
761 			};
762 		}
763 		if (t->next_disp == srv->max_repos_display &&
764 		    t->repos_total != (qs->index_page + 1) *
765 		    srv->max_repos_display) {
766 			*have_next = 1;
767 			*next = (struct gotweb_url){
768 				.action = -1,
769 				.index_page = qs->index_page + 1,
770 				.page = -1,
771 			};
772 		}
773 		break;
774 	case TAGS:
775 		if (t->prev_id && qs->commit != NULL &&
776 		    strcmp(qs->commit, t->prev_id) != 0) {
777 			*have_prev = 1;
778 			*prev = (struct gotweb_url){
779 				.action = TAGS,
780 				.index_page = -1,
781 				.page = qs->page - 1,
782 				.path = qs->path,
783 				.commit = t->prev_id,
784 				.headref = qs->headref,
785 			};
786 		}
787 		if (t->next_id) {
788 			*have_next = 1;
789 			*next = (struct gotweb_url){
790 				.action = TAGS,
791 				.index_page = -1,
792 				.page = qs->page + 1,
793 				.path = qs->path,
794 				.commit = t->next_id,
795 				.headref = qs->headref,
796 			};
797 		}
798 		break;
799 	}
800 }
801 
802 static int
803 gotweb_render_index(struct template *tp)
804 {
805 	const struct got_error *error = NULL;
806 	struct request *c = tp->tp_arg;
807 	struct server *srv = c->srv;
808 	struct transport *t = c->t;
809 	struct querystring *qs = t->qs;
810 	struct repo_dir *repo_dir = NULL;
811 	struct dirent **sd_dent = t->repos;
812 	unsigned int d_i, d_disp = 0;
813 	unsigned int d_skipped = 0;
814 	int type, r;
815 
816 	if (gotweb_render_repo_table_hdr(c->tp) == -1)
817 		return -1;
818 
819 	for (d_i = 0; d_i < t->nrepos; d_i++) {
820 		if (srv->max_repos > 0 && t->prev_disp == srv->max_repos)
821 			break;
822 
823 		if (strcmp(sd_dent[d_i]->d_name, ".") == 0 ||
824 		    strcmp(sd_dent[d_i]->d_name, "..") == 0) {
825 			d_skipped++;
826 			continue;
827 		}
828 
829 		error = got_path_dirent_type(&type, srv->repos_path,
830 		    sd_dent[d_i]);
831 		if (error)
832 			continue;
833 		if (type != DT_DIR) {
834 			d_skipped++;
835 			continue;
836 		}
837 
838 		if (qs->index_page > 0 && (qs->index_page *
839 		    srv->max_repos_display) > t->prev_disp) {
840 			t->prev_disp++;
841 			continue;
842 		}
843 
844 		error = gotweb_init_repo_dir(&repo_dir, sd_dent[d_i]->d_name);
845 		if (error)
846 			continue;
847 
848 		error = gotweb_load_got_path(c, repo_dir);
849 		if (error && error->code != GOT_ERR_LONELY_PACKIDX) {
850 			if (error->code != GOT_ERR_NOT_GIT_REPO)
851 				log_warnx("%s: %s: %s", __func__,
852 				    sd_dent[d_i]->d_name, error->msg);
853 			gotweb_free_repo_dir(repo_dir);
854 			repo_dir = NULL;
855 			d_skipped++;
856 			continue;
857 		}
858 
859 		d_disp++;
860 		t->prev_disp++;
861 
862 		r = gotweb_render_repo_fragment(c->tp, repo_dir);
863 		gotweb_free_repo_dir(repo_dir);
864 		if (r == -1)
865 			return -1;
866 
867 		t->next_disp++;
868 		if (d_disp == srv->max_repos_display)
869 			break;
870 	}
871 	t->repos_total = t->nrepos - d_skipped;
872 
873 	if (srv->max_repos_display == 0)
874 		return 0;
875 	if (srv->max_repos > 0 && srv->max_repos < srv->max_repos_display)
876 		return 0;
877 	if (t->repos_total <= srv->max_repos ||
878 	    t->repos_total <= srv->max_repos_display)
879 		return 0;
880 
881 	if (gotweb_render_navs(c->tp) == -1)
882 		return -1;
883 
884 	return 0;
885 }
886 
887 static inline int
888 should_urlencode(int c)
889 {
890 	if (c <= ' ' || c >= 127)
891 		return 1;
892 
893 	switch (c) {
894 		/* gen-delim */
895 	case ':':
896 	case '/':
897 	case '?':
898 	case '#':
899 	case '[':
900 	case ']':
901 	case '@':
902 		/* sub-delims */
903 	case '!':
904 	case '$':
905 	case '&':
906 	case '\'':
907 	case '(':
908 	case ')':
909 	case '*':
910 	case '+':
911 	case ',':
912 	case ';':
913 	case '=':
914 		/* needed because the URLs are embedded into the HTML */
915 	case '\"':
916 		return 1;
917 	default:
918 		return 0;
919 	}
920 }
921 
922 static char *
923 gotweb_urlencode(const char *str)
924 {
925 	const char *s;
926 	char *escaped;
927 	size_t i, len;
928 	int a, b;
929 
930 	len = 0;
931 	for (s = str; *s; ++s) {
932 		len++;
933 		if (should_urlencode(*s))
934 			len += 2;
935 	}
936 
937 	escaped = calloc(1, len + 1);
938 	if (escaped == NULL)
939 		return NULL;
940 
941 	i = 0;
942 	for (s = str; *s; ++s) {
943 		if (should_urlencode(*s)) {
944 			a = (*s & 0xF0) >> 4;
945 			b = (*s & 0x0F);
946 
947 			escaped[i++] = '%';
948 			escaped[i++] = a <= 9 ? ('0' + a) : ('7' + a);
949 			escaped[i++] = b <= 9 ? ('0' + b) : ('7' + b);
950 		} else
951 			escaped[i++] = *s;
952 	}
953 
954 	return escaped;
955 }
956 
957 const char *
958 gotweb_action_name(int action)
959 {
960 	switch (action) {
961 	case BLAME:
962 		return "blame";
963 	case BLOB:
964 		return "blob";
965 	case BLOBRAW:
966 		return "blobraw";
967 	case BRIEFS:
968 		return "briefs";
969 	case COMMITS:
970 		return "commits";
971 	case DIFF:
972 		return "diff";
973 	case ERR:
974 		return "err";
975 	case INDEX:
976 		return "index";
977 	case SUMMARY:
978 		return "summary";
979 	case TAG:
980 		return "tag";
981 	case TAGS:
982 		return "tags";
983 	case TREE:
984 		return "tree";
985 	case RSS:
986 		return "rss";
987 	default:
988 		return NULL;
989 	}
990 }
991 
992 int
993 gotweb_render_url(struct request *c, struct gotweb_url *url)
994 {
995 	const char *sep = "?", *action;
996 	char *tmp;
997 	int r;
998 
999 	action = gotweb_action_name(url->action);
1000 	if (action != NULL) {
1001 		if (fcgi_printf(c, "?action=%s", action) == -1)
1002 			return -1;
1003 		sep = "&";
1004 	}
1005 
1006 	if (url->commit) {
1007 		if (fcgi_printf(c, "%scommit=%s", sep, url->commit) == -1)
1008 			return -1;
1009 		sep = "&";
1010 	}
1011 
1012 	if (url->previd) {
1013 		if (fcgi_printf(c, "%sprevid=%s", sep, url->previd) == -1)
1014 			return -1;
1015 		sep = "&";
1016 	}
1017 
1018 	if (url->prevset) {
1019 		if (fcgi_printf(c, "%sprevset=%s", sep, url->prevset) == -1)
1020 			return -1;
1021 		sep = "&";
1022 	}
1023 
1024 	if (url->file) {
1025 		tmp = gotweb_urlencode(url->file);
1026 		if (tmp == NULL)
1027 			return -1;
1028 		r = fcgi_printf(c, "%sfile=%s", sep, tmp);
1029 		free(tmp);
1030 		if (r == -1)
1031 			return -1;
1032 		sep = "&";
1033 	}
1034 
1035 	if (url->folder) {
1036 		tmp = gotweb_urlencode(url->folder);
1037 		if (tmp == NULL)
1038 			return -1;
1039 		r = fcgi_printf(c, "%sfolder=%s", sep, tmp);
1040 		free(tmp);
1041 		if (r == -1)
1042 			return -1;
1043 		sep = "&";
1044 	}
1045 
1046 	if (url->headref) {
1047 		tmp = gotweb_urlencode(url->headref);
1048 		if (tmp == NULL)
1049 			return -1;
1050 		r = fcgi_printf(c, "%sheadref=%s", sep, url->headref);
1051 		free(tmp);
1052 		if (r == -1)
1053 			return -1;
1054 		sep = "&";
1055 	}
1056 
1057 	if (url->index_page != -1) {
1058 		if (fcgi_printf(c, "%sindex_page=%d", sep,
1059 		    url->index_page) == -1)
1060 			return -1;
1061 		sep = "&";
1062 	}
1063 
1064 	if (url->path) {
1065 		tmp = gotweb_urlencode(url->path);
1066 		if (tmp == NULL)
1067 			return -1;
1068 		r = fcgi_printf(c, "%spath=%s", sep, tmp);
1069 		free(tmp);
1070 		if (r == -1)
1071 			return -1;
1072 		sep = "&";
1073 	}
1074 
1075 	if (url->page != -1) {
1076 		if (fcgi_printf(c, "%spage=%d", sep, url->page) == -1)
1077 			return -1;
1078 		sep = "&";
1079 	}
1080 
1081 	return 0;
1082 }
1083 
1084 int
1085 gotweb_render_absolute_url(struct request *c, struct gotweb_url *url)
1086 {
1087 	struct template	*tp = c->tp;
1088 	const char	*proto = c->https ? "https" : "http";
1089 
1090 	if (fcgi_puts(tp, proto) == -1 ||
1091 	    fcgi_puts(tp, "://") == -1 ||
1092 	    tp_htmlescape(tp, c->server_name) == -1 ||
1093 	    tp_htmlescape(tp, c->document_uri) == -1)
1094 		return -1;
1095 
1096 	return gotweb_render_url(c, url);
1097 }
1098 
1099 static struct got_repository *
1100 find_cached_repo(struct server *srv, const char *path)
1101 {
1102 	int i;
1103 
1104 	for (i = 0; i < srv->ncached_repos; i++) {
1105 		if (strcmp(srv->cached_repos[i].path, path) == 0)
1106 			return srv->cached_repos[i].repo;
1107 	}
1108 
1109 	return NULL;
1110 }
1111 
1112 static const struct got_error *
1113 cache_repo(struct got_repository **new, struct server *srv,
1114     struct repo_dir *repo_dir, struct socket *sock)
1115 {
1116 	const struct got_error *error = NULL;
1117 	struct got_repository *repo;
1118 	struct cached_repo *cr;
1119 	int evicted = 0;
1120 
1121 	if (srv->ncached_repos >= GOTWEBD_REPO_CACHESIZE) {
1122 		cr = &srv->cached_repos[srv->ncached_repos - 1];
1123 		error = got_repo_close(cr->repo);
1124 		memset(cr, 0, sizeof(*cr));
1125 		srv->ncached_repos--;
1126 		if (error)
1127 			return error;
1128 		memmove(&srv->cached_repos[1], &srv->cached_repos[0],
1129 		    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1130 		cr = &srv->cached_repos[0];
1131 		evicted = 1;
1132 	} else {
1133 		cr = &srv->cached_repos[srv->ncached_repos];
1134 	}
1135 
1136 	error = got_repo_open(&repo, repo_dir->path, NULL, sock->pack_fds);
1137 	if (error) {
1138 		if (evicted) {
1139 			memmove(&srv->cached_repos[0], &srv->cached_repos[1],
1140 			    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1141 		}
1142 		return error;
1143 	}
1144 
1145 	if (strlcpy(cr->path, repo_dir->path, sizeof(cr->path))
1146 	    >= sizeof(cr->path)) {
1147 		if (evicted) {
1148 			memmove(&srv->cached_repos[0], &srv->cached_repos[1],
1149 			    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1150 		}
1151 		return got_error(GOT_ERR_NO_SPACE);
1152 	}
1153 
1154 	cr->repo = repo;
1155 	srv->ncached_repos++;
1156 	*new = repo;
1157 	return NULL;
1158 }
1159 
1160 static const struct got_error *
1161 gotweb_load_got_path(struct request *c, struct repo_dir *repo_dir)
1162 {
1163 	const struct got_error *error = NULL;
1164 	struct socket *sock = c->sock;
1165 	struct server *srv = c->srv;
1166 	struct transport *t = c->t;
1167 	struct got_repository *repo = NULL;
1168 	DIR *dt;
1169 	char *dir_test;
1170 
1171 	if (asprintf(&dir_test, "%s/%s/%s", srv->repos_path, repo_dir->name,
1172 	    GOTWEB_GIT_DIR) == -1)
1173 		return got_error_from_errno("asprintf");
1174 
1175 	dt = opendir(dir_test);
1176 	if (dt == NULL) {
1177 		free(dir_test);
1178 	} else {
1179 		repo_dir->path = dir_test;
1180 		dir_test = NULL;
1181 		goto done;
1182 	}
1183 
1184 	if (asprintf(&dir_test, "%s/%s", srv->repos_path,
1185 	    repo_dir->name) == -1)
1186 		return got_error_from_errno("asprintf");
1187 
1188 	dt = opendir(dir_test);
1189 	if (dt == NULL) {
1190 		error = got_error_path(repo_dir->name, GOT_ERR_NOT_GIT_REPO);
1191 		goto err;
1192 	} else {
1193 		repo_dir->path = dir_test;
1194 		dir_test = NULL;
1195 	}
1196 
1197 done:
1198 	if (srv->respect_exportok &&
1199 	    faccessat(dirfd(dt), "git-daemon-export-ok", F_OK, 0) == -1) {
1200 		error = got_error_path(repo_dir->name, GOT_ERR_NOT_GIT_REPO);
1201 		goto err;
1202 	}
1203 
1204 	repo = find_cached_repo(srv, repo_dir->path);
1205 	if (repo == NULL) {
1206 		error = cache_repo(&repo, srv, repo_dir, sock);
1207 		if (error)
1208 			goto err;
1209 	}
1210 	t->repo = repo;
1211 	error = gotweb_get_repo_description(&repo_dir->description, srv,
1212 	    repo_dir->path, dirfd(dt));
1213 	if (error)
1214 		goto err;
1215 	error = got_get_repo_owner(&repo_dir->owner, c);
1216 	if (error)
1217 		goto err;
1218 	error = got_get_repo_age(&repo_dir->age, c, NULL);
1219 	if (error)
1220 		goto err;
1221 	error = gotweb_get_clone_url(&repo_dir->url, srv, repo_dir->path,
1222 	    dirfd(dt));
1223 err:
1224 	free(dir_test);
1225 	if (dt != NULL && closedir(dt) == EOF && error == NULL)
1226 		error = got_error_from_errno("closedir");
1227 	return error;
1228 }
1229 
1230 static const struct got_error *
1231 gotweb_init_repo_dir(struct repo_dir **repo_dir, const char *dir)
1232 {
1233 	const struct got_error *error;
1234 
1235 	*repo_dir = calloc(1, sizeof(**repo_dir));
1236 	if (*repo_dir == NULL)
1237 		return got_error_from_errno("calloc");
1238 
1239 	if (asprintf(&(*repo_dir)->name, "%s", dir) == -1) {
1240 		error = got_error_from_errno("asprintf");
1241 		free(*repo_dir);
1242 		*repo_dir = NULL;
1243 		return error;
1244 	}
1245 	(*repo_dir)->owner = NULL;
1246 	(*repo_dir)->description = NULL;
1247 	(*repo_dir)->url = NULL;
1248 	(*repo_dir)->path = NULL;
1249 
1250 	return NULL;
1251 }
1252 
1253 static const struct got_error *
1254 gotweb_get_repo_description(char **description, struct server *srv,
1255     const char *dirpath, int dir)
1256 {
1257 	const struct got_error *error = NULL;
1258 	struct stat sb;
1259 	int fd = -1;
1260 	off_t len;
1261 
1262 	*description = NULL;
1263 	if (srv->show_repo_description == 0)
1264 		return NULL;
1265 
1266 	fd = openat(dir, "description", O_RDONLY);
1267 	if (fd == -1) {
1268 		if (errno != ENOENT && errno != EACCES) {
1269 			error = got_error_from_errno_fmt("openat %s/%s",
1270 			    dirpath, "description");
1271 		}
1272 		goto done;
1273 	}
1274 
1275 	if (fstat(fd, &sb) == -1) {
1276 		error = got_error_from_errno_fmt("fstat %s/%s",
1277 		    dirpath, "description");
1278 		goto done;
1279 	}
1280 
1281 	len = sb.st_size;
1282 	if (len > GOTWEBD_MAXDESCRSZ - 1)
1283 		len = GOTWEBD_MAXDESCRSZ - 1;
1284 
1285 	*description = calloc(len + 1, sizeof(**description));
1286 	if (*description == NULL) {
1287 		error = got_error_from_errno("calloc");
1288 		goto done;
1289 	}
1290 
1291 	if (read(fd, *description, len) == -1)
1292 		error = got_error_from_errno("read");
1293 done:
1294 	if (fd != -1 && close(fd) == -1 && error == NULL)
1295 		error = got_error_from_errno("close");
1296 	return error;
1297 }
1298 
1299 static const struct got_error *
1300 gotweb_get_clone_url(char **url, struct server *srv, const char *dirpath,
1301     int dir)
1302 {
1303 	const struct got_error *error = NULL;
1304 	struct stat sb;
1305 	int fd = -1;
1306 	off_t len;
1307 
1308 	*url = NULL;
1309 	if (srv->show_repo_cloneurl == 0)
1310 		return NULL;
1311 
1312 	fd = openat(dir, "cloneurl", O_RDONLY);
1313 	if (fd == -1) {
1314 		if (errno != ENOENT && errno != EACCES) {
1315 			error = got_error_from_errno_fmt("openat %s/%s",
1316 			    dirpath, "cloneurl");
1317 		}
1318 		goto done;
1319 	}
1320 
1321 	if (fstat(fd, &sb) == -1) {
1322 		error = got_error_from_errno_fmt("fstat %s/%s",
1323 		    dirpath, "cloneurl");
1324 		goto done;
1325 	}
1326 
1327 	len = sb.st_size;
1328 	if (len > GOTWEBD_MAXCLONEURLSZ - 1)
1329 		len = GOTWEBD_MAXCLONEURLSZ - 1;
1330 
1331 	*url = calloc(len + 1, sizeof(**url));
1332 	if (*url == NULL) {
1333 		error = got_error_from_errno("calloc");
1334 		goto done;
1335 	}
1336 
1337 	if (read(fd, *url, len) == -1)
1338 		error = got_error_from_errno("read");
1339 done:
1340 	if (fd != -1 && close(fd) == -1 && error == NULL)
1341 		error = got_error_from_errno("close");
1342 	return error;
1343 }
1344 
1345 int
1346 gotweb_render_age(struct template *tp, time_t committer_time, int ref_tm)
1347 {
1348 	struct request *c = tp->tp_arg;
1349 	struct tm tm;
1350 	long long diff_time;
1351 	const char *years = "years ago", *months = "months ago";
1352 	const char *weeks = "weeks ago", *days = "days ago";
1353 	const char *hours = "hours ago",  *minutes = "minutes ago";
1354 	const char *seconds = "seconds ago", *now = "right now";
1355 	char *s;
1356 	char datebuf[64];
1357 	size_t r;
1358 
1359 	switch (ref_tm) {
1360 	case TM_DIFF:
1361 		diff_time = time(NULL) - committer_time;
1362 		if (diff_time > 60 * 60 * 24 * 365 * 2) {
1363 			if (fcgi_printf(c, "%lld %s",
1364 			    (diff_time / 60 / 60 / 24 / 365), years) == -1)
1365 				return -1;
1366 		} else if (diff_time > 60 * 60 * 24 * (365 / 12) * 2) {
1367 			if (fcgi_printf(c, "%lld %s",
1368 			    (diff_time / 60 / 60 / 24 / (365 / 12)),
1369 			    months) == -1)
1370 				return -1;
1371 		} else if (diff_time > 60 * 60 * 24 * 7 * 2) {
1372 			if (fcgi_printf(c, "%lld %s",
1373 			    (diff_time / 60 / 60 / 24 / 7), weeks) == -1)
1374 				return -1;
1375 		} else if (diff_time > 60 * 60 * 24 * 2) {
1376 			if (fcgi_printf(c, "%lld %s",
1377 			    (diff_time / 60 / 60 / 24), days) == -1)
1378 				return -1;
1379 		} else if (diff_time > 60 * 60 * 2) {
1380 			if (fcgi_printf(c, "%lld %s",
1381 			    (diff_time / 60 / 60), hours) == -1)
1382 				return -1;
1383 		} else if (diff_time > 60 * 2) {
1384 			if (fcgi_printf(c, "%lld %s", (diff_time / 60),
1385 			    minutes) == -1)
1386 				return -1;
1387 		} else if (diff_time > 2) {
1388 			if (fcgi_printf(c, "%lld %s", diff_time,
1389 			    seconds) == -1)
1390 				return -1;
1391 		} else {
1392 			if (fcgi_puts(tp, now) == -1)
1393 				return -1;
1394 		}
1395 		break;
1396 	case TM_LONG:
1397 		if (gmtime_r(&committer_time, &tm) == NULL)
1398 			return -1;
1399 
1400 		s = asctime_r(&tm, datebuf);
1401 		if (s == NULL)
1402 			return -1;
1403 
1404 		if (fcgi_puts(tp, datebuf) == -1 ||
1405 		    fcgi_puts(tp, " UTC") == -1)
1406 			return -1;
1407 		break;
1408 	case TM_RFC822:
1409 		if (gmtime_r(&committer_time, &tm) == NULL)
1410 			return -1;
1411 
1412 		r = strftime(datebuf, sizeof(datebuf),
1413 		    "%a, %d %b %Y %H:%M:%S GMT", &tm);
1414 		if (r == 0)
1415 			return -1;
1416 
1417 		if (fcgi_puts(tp, datebuf) == -1)
1418 			return -1;
1419 		break;
1420 	}
1421 	return 0;
1422 }