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(uint8_t *, uint8_t *);
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, c->http_host);
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_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(uint8_t *server_name, uint8_t *subdomain)
390 {
391 	struct server *srv = NULL;
392 
393 	/* check against the server name first */
394 	if (strlen(server_name) > 0)
395 		TAILQ_FOREACH(srv, &gotwebd_env->servers, entry)
396 			if (strcmp(srv->name, server_name) == 0)
397 				goto done;
398 
399 	/* check against subdomain second */
400 	if (strlen(subdomain) > 0)
401 		TAILQ_FOREACH(srv, &gotwebd_env->servers, entry)
402 			if (strcmp(srv->name, subdomain) == 0)
403 				goto done;
404 
405 	/* if those fail, send first server */
406 	TAILQ_FOREACH(srv, &gotwebd_env->servers, entry)
407 		if (srv != NULL)
408 			break;
409 done:
410 	return srv;
411 };
412 
413 const struct got_error *
414 gotweb_init_transport(struct transport **t)
415 {
416 	const struct got_error *error = NULL;
417 
418 	*t = calloc(1, sizeof(**t));
419 	if (*t == NULL)
420 		return got_error_from_errno2("%s: calloc", __func__);
421 
422 	TAILQ_INIT(&(*t)->repo_commits);
423 	TAILQ_INIT(&(*t)->repo_tags);
424 	TAILQ_INIT(&(*t)->refs);
425 
426 	(*t)->fd = -1;
427 
428 	return error;
429 }
430 
431 static const struct got_error *
432 gotweb_init_querystring(struct querystring **qs)
433 {
434 	const struct got_error *error = NULL;
435 
436 	*qs = calloc(1, sizeof(**qs));
437 	if (*qs == NULL)
438 		return got_error_from_errno2("%s: calloc", __func__);
439 
440 	(*qs)->headref = strdup("HEAD");
441 	if ((*qs)->headref == NULL) {
442 		free(*qs);
443 		*qs = NULL;
444 		return got_error_from_errno2("%s: strdup", __func__);
445 	}
446 
447 	(*qs)->action = INDEX;
448 	(*qs)->commit = NULL;
449 	(*qs)->file = NULL;
450 	(*qs)->folder = NULL;
451 	(*qs)->index_page = 0;
452 	(*qs)->path = NULL;
453 
454 	return error;
455 }
456 
457 static const struct got_error *
458 gotweb_parse_querystring(struct querystring **qs, char *qst)
459 {
460 	const struct got_error *error = NULL;
461 	char *tok1 = NULL, *tok1_pair = NULL, *tok1_end = NULL;
462 	char *tok2 = NULL, *tok2_pair = NULL, *tok2_end = NULL;
463 
464 	if (qst == NULL)
465 		return error;
466 
467 	tok1 = strdup(qst);
468 	if (tok1 == NULL)
469 		return got_error_from_errno2("%s: strdup", __func__);
470 
471 	tok1_pair = tok1;
472 	tok1_end = tok1;
473 
474 	while (tok1_pair != NULL) {
475 		strsep(&tok1_end, "&");
476 
477 		tok2 = strdup(tok1_pair);
478 		if (tok2 == NULL) {
479 			free(tok1);
480 			return got_error_from_errno2("%s: strdup", __func__);
481 		}
482 
483 		tok2_pair = tok2;
484 		tok2_end = tok2;
485 
486 		while (tok2_pair != NULL) {
487 			strsep(&tok2_end, "=");
488 			if (tok2_end) {
489 				error = gotweb_assign_querystring(qs, tok2_pair,
490 				    tok2_end);
491 				if (error)
492 					goto err;
493 			}
494 			tok2_pair = tok2_end;
495 		}
496 		free(tok2);
497 		tok1_pair = tok1_end;
498 	}
499 	free(tok1);
500 	return error;
501 err:
502 	free(tok2);
503 	free(tok1);
504 	return error;
505 }
506 
507 /*
508  * Adapted from usr.sbin/httpd/httpd.c url_decode.
509  */
510 static const struct got_error *
511 gotweb_urldecode(char *url)
512 {
513 	char		*p, *q;
514 	char		 hex[3];
515 	unsigned long	 x;
516 
517 	hex[2] = '\0';
518 	p = q = url;
519 
520 	while (*p != '\0') {
521 		switch (*p) {
522 		case '%':
523 			/* Encoding character is followed by two hex chars */
524 			if (!isxdigit((unsigned char)p[1]) ||
525 			    !isxdigit((unsigned char)p[2]) ||
526 			    (p[1] == '0' && p[2] == '0'))
527 				return got_error(GOT_ERR_BAD_QUERYSTRING);
528 
529 			hex[0] = p[1];
530 			hex[1] = p[2];
531 
532 			/*
533 			 * We don't have to validate "hex" because it is
534 			 * guaranteed to include two hex chars followed by nul.
535 			 */
536 			x = strtoul(hex, NULL, 16);
537 			*q = (char)x;
538 			p += 2;
539 			break;
540 		default:
541 			*q = *p;
542 			break;
543 		}
544 		p++;
545 		q++;
546 	}
547 	*q = '\0';
548 
549 	return NULL;
550 }
551 
552 static const struct got_error *
553 gotweb_assign_querystring(struct querystring **qs, char *key, char *value)
554 {
555 	const struct got_error *error = NULL;
556 	const char *errstr;
557 	int a_cnt, el_cnt;
558 
559 	error = gotweb_urldecode(value);
560 	if (error)
561 		return error;
562 
563 	for (el_cnt = 0; el_cnt < QSELEM__MAX; el_cnt++) {
564 		if (strcmp(key, querystring_keys[el_cnt].name) != 0)
565 			continue;
566 
567 		switch (querystring_keys[el_cnt].element) {
568 		case ACTION:
569 			for (a_cnt = 0; a_cnt < ACTIONS__MAX; a_cnt++) {
570 				if (strcmp(value, action_keys[a_cnt].name) != 0)
571 					continue;
572 				else if (strcmp(value,
573 				    action_keys[a_cnt].name) == 0){
574 					(*qs)->action =
575 					    action_keys[a_cnt].action;
576 					goto qa_found;
577 				}
578 			}
579 			(*qs)->action = ERR;
580 qa_found:
581 			break;
582 		case COMMIT:
583 			(*qs)->commit = strdup(value);
584 			if ((*qs)->commit == NULL) {
585 				error = got_error_from_errno2("%s: strdup",
586 				    __func__);
587 				goto done;
588 			}
589 			break;
590 		case RFILE:
591 			(*qs)->file = strdup(value);
592 			if ((*qs)->file == NULL) {
593 				error = got_error_from_errno2("%s: strdup",
594 				    __func__);
595 				goto done;
596 			}
597 			break;
598 		case FOLDER:
599 			(*qs)->folder = strdup(value);
600 			if ((*qs)->folder == NULL) {
601 				error = got_error_from_errno2("%s: strdup",
602 				    __func__);
603 				goto done;
604 			}
605 			break;
606 		case HEADREF:
607 			free((*qs)->headref);
608 			(*qs)->headref = strdup(value);
609 			if ((*qs)->headref == NULL) {
610 				error = got_error_from_errno2("%s: strdup",
611 				    __func__);
612 				goto done;
613 			}
614 			break;
615 		case INDEX_PAGE:
616 			if (strlen(value) == 0)
617 				break;
618 			(*qs)->index_page = strtonum(value, INT64_MIN,
619 			    INT64_MAX, &errstr);
620 			if (errstr) {
621 				error = got_error_from_errno3("%s: strtonum %s",
622 				    __func__, errstr);
623 				goto done;
624 			}
625 			if ((*qs)->index_page < 0)
626 				(*qs)->index_page = 0;
627 			break;
628 		case PATH:
629 			(*qs)->path = strdup(value);
630 			if ((*qs)->path == NULL) {
631 				error = got_error_from_errno2("%s: strdup",
632 				    __func__);
633 				goto done;
634 			}
635 			break;
636 		case PAGE:
637 			if (strlen(value) == 0)
638 				break;
639 			(*qs)->page = strtonum(value, INT64_MIN,
640 			    INT64_MAX, &errstr);
641 			if (errstr) {
642 				error = got_error_from_errno3("%s: strtonum %s",
643 				    __func__, errstr);
644 				goto done;
645 			}
646 			if ((*qs)->page < 0)
647 				(*qs)->page = 0;
648 			break;
649 		default:
650 			break;
651 		}
652 	}
653 done:
654 	return error;
655 }
656 
657 void
658 gotweb_free_repo_tag(struct repo_tag *rt)
659 {
660 	if (rt != NULL) {
661 		free(rt->commit_id);
662 		free(rt->tag_name);
663 		free(rt->tag_commit);
664 		free(rt->commit_msg);
665 		free(rt->tagger);
666 	}
667 	free(rt);
668 }
669 
670 void
671 gotweb_free_repo_commit(struct repo_commit *rc)
672 {
673 	if (rc != NULL) {
674 		free(rc->path);
675 		free(rc->refs_str);
676 		free(rc->commit_id);
677 		free(rc->parent_id);
678 		free(rc->tree_id);
679 		free(rc->author);
680 		free(rc->committer);
681 		free(rc->commit_msg);
682 	}
683 	free(rc);
684 }
685 
686 static void
687 gotweb_free_querystring(struct querystring *qs)
688 {
689 	if (qs != NULL) {
690 		free(qs->commit);
691 		free(qs->file);
692 		free(qs->folder);
693 		free(qs->headref);
694 		free(qs->path);
695 	}
696 	free(qs);
697 }
698 
699 static void
700 gotweb_free_repo_dir(struct repo_dir *repo_dir)
701 {
702 	if (repo_dir != NULL) {
703 		free(repo_dir->name);
704 		free(repo_dir->owner);
705 		free(repo_dir->description);
706 		free(repo_dir->url);
707 		free(repo_dir->path);
708 	}
709 	free(repo_dir);
710 }
711 
712 void
713 gotweb_free_transport(struct transport *t)
714 {
715 	const struct got_error *err;
716 	struct repo_commit *rc = NULL, *trc = NULL;
717 	struct repo_tag *rt = NULL, *trt = NULL;
718 	int i;
719 
720 	got_ref_list_free(&t->refs);
721 	TAILQ_FOREACH_SAFE(rc, &t->repo_commits, entry, trc) {
722 		TAILQ_REMOVE(&t->repo_commits, rc, entry);
723 		gotweb_free_repo_commit(rc);
724 	}
725 	TAILQ_FOREACH_SAFE(rt, &t->repo_tags, entry, trt) {
726 		TAILQ_REMOVE(&t->repo_tags, rt, entry);
727 		gotweb_free_repo_tag(rt);
728 	}
729 	gotweb_free_repo_dir(t->repo_dir);
730 	gotweb_free_querystring(t->qs);
731 	free(t->more_id);
732 	free(t->next_id);
733 	free(t->prev_id);
734 	if (t->blob)
735 		got_object_blob_close(t->blob);
736 	if (t->fp) {
737 		err = got_gotweb_closefile(t->fp);
738 		if (err)
739 			log_warnx("%s: got_gotweb_closefile failure: %s",
740 			    __func__, err->msg);
741 	}
742 	if (t->fd != -1 && close(t->fd) == -1)
743 		log_warn("%s: close", __func__);
744 	if (t->repos) {
745 		for (i = 0; i < t->nrepos; ++i)
746 			free(t->repos[i]);
747 		free(t->repos);
748 	}
749 	free(t);
750 }
751 
752 void
753 gotweb_get_navs(struct request *c, struct gotweb_url *prev, int *have_prev,
754     struct gotweb_url *next, int *have_next)
755 {
756 	struct transport *t = c->t;
757 	struct querystring *qs = t->qs;
758 	struct server *srv = c->srv;
759 
760 	*have_prev = *have_next = 0;
761 
762 	switch(qs->action) {
763 	case INDEX:
764 		if (qs->index_page > 0) {
765 			*have_prev = 1;
766 			*prev = (struct gotweb_url){
767 				.action = -1,
768 				.index_page = qs->index_page - 1,
769 				.page = -1,
770 			};
771 		}
772 		if (t->next_disp == srv->max_repos_display &&
773 		    t->repos_total != (qs->index_page + 1) *
774 		    srv->max_repos_display) {
775 			*have_next = 1;
776 			*next = (struct gotweb_url){
777 				.action = -1,
778 				.index_page = qs->index_page + 1,
779 				.page = -1,
780 			};
781 		}
782 		break;
783 	case TAGS:
784 		if (t->prev_id && qs->commit != NULL &&
785 		    strcmp(qs->commit, t->prev_id) != 0) {
786 			*have_prev = 1;
787 			*prev = (struct gotweb_url){
788 				.action = TAGS,
789 				.index_page = -1,
790 				.page = qs->page - 1,
791 				.path = qs->path,
792 				.commit = t->prev_id,
793 				.headref = qs->headref,
794 			};
795 		}
796 		if (t->next_id) {
797 			*have_next = 1;
798 			*next = (struct gotweb_url){
799 				.action = TAGS,
800 				.index_page = -1,
801 				.page = qs->page + 1,
802 				.path = qs->path,
803 				.commit = t->next_id,
804 				.headref = qs->headref,
805 			};
806 		}
807 		break;
808 	}
809 }
810 
811 static int
812 gotweb_render_index(struct template *tp)
813 {
814 	const struct got_error *error = NULL;
815 	struct request *c = tp->tp_arg;
816 	struct server *srv = c->srv;
817 	struct transport *t = c->t;
818 	struct querystring *qs = t->qs;
819 	struct repo_dir *repo_dir = NULL;
820 	struct dirent **sd_dent = t->repos;
821 	unsigned int d_i, d_disp = 0;
822 	unsigned int d_skipped = 0;
823 	int type, r;
824 
825 	if (gotweb_render_repo_table_hdr(c->tp) == -1)
826 		return -1;
827 
828 	for (d_i = 0; d_i < t->nrepos; d_i++) {
829 		if (srv->max_repos > 0 && t->prev_disp == srv->max_repos)
830 			break;
831 
832 		if (strcmp(sd_dent[d_i]->d_name, ".") == 0 ||
833 		    strcmp(sd_dent[d_i]->d_name, "..") == 0) {
834 			d_skipped++;
835 			continue;
836 		}
837 
838 		error = got_path_dirent_type(&type, srv->repos_path,
839 		    sd_dent[d_i]);
840 		if (error)
841 			continue;
842 		if (type != DT_DIR) {
843 			d_skipped++;
844 			continue;
845 		}
846 
847 		if (qs->index_page > 0 && (qs->index_page *
848 		    srv->max_repos_display) > t->prev_disp) {
849 			t->prev_disp++;
850 			continue;
851 		}
852 
853 		error = gotweb_init_repo_dir(&repo_dir, sd_dent[d_i]->d_name);
854 		if (error)
855 			continue;
856 
857 		error = gotweb_load_got_path(c, repo_dir);
858 		if (error && error->code != GOT_ERR_LONELY_PACKIDX) {
859 			if (error->code != GOT_ERR_NOT_GIT_REPO)
860 				log_warnx("%s: %s: %s", __func__,
861 				    sd_dent[d_i]->d_name, error->msg);
862 			gotweb_free_repo_dir(repo_dir);
863 			repo_dir = NULL;
864 			d_skipped++;
865 			continue;
866 		}
867 
868 		d_disp++;
869 		t->prev_disp++;
870 
871 		r = gotweb_render_repo_fragment(c->tp, repo_dir);
872 		gotweb_free_repo_dir(repo_dir);
873 		if (r == -1)
874 			return -1;
875 
876 		t->next_disp++;
877 		if (d_disp == srv->max_repos_display)
878 			break;
879 	}
880 	t->repos_total = t->nrepos - d_skipped;
881 
882 	if (srv->max_repos_display == 0)
883 		return 0;
884 	if (srv->max_repos > 0 && srv->max_repos < srv->max_repos_display)
885 		return 0;
886 	if (t->repos_total <= srv->max_repos ||
887 	    t->repos_total <= srv->max_repos_display)
888 		return 0;
889 
890 	if (gotweb_render_navs(c->tp) == -1)
891 		return -1;
892 
893 	return 0;
894 }
895 
896 static inline int
897 should_urlencode(int c)
898 {
899 	if (c <= ' ' || c >= 127)
900 		return 1;
901 
902 	switch (c) {
903 		/* gen-delim */
904 	case ':':
905 	case '/':
906 	case '?':
907 	case '#':
908 	case '[':
909 	case ']':
910 	case '@':
911 		/* sub-delims */
912 	case '!':
913 	case '$':
914 	case '&':
915 	case '\'':
916 	case '(':
917 	case ')':
918 	case '*':
919 	case '+':
920 	case ',':
921 	case ';':
922 	case '=':
923 		/* needed because the URLs are embedded into the HTML */
924 	case '\"':
925 		return 1;
926 	default:
927 		return 0;
928 	}
929 }
930 
931 static char *
932 gotweb_urlencode(const char *str)
933 {
934 	const char *s;
935 	char *escaped;
936 	size_t i, len;
937 	int a, b;
938 
939 	len = 0;
940 	for (s = str; *s; ++s) {
941 		len++;
942 		if (should_urlencode(*s))
943 			len += 2;
944 	}
945 
946 	escaped = calloc(1, len + 1);
947 	if (escaped == NULL)
948 		return NULL;
949 
950 	i = 0;
951 	for (s = str; *s; ++s) {
952 		if (should_urlencode(*s)) {
953 			a = (*s & 0xF0) >> 4;
954 			b = (*s & 0x0F);
955 
956 			escaped[i++] = '%';
957 			escaped[i++] = a <= 9 ? ('0' + a) : ('7' + a);
958 			escaped[i++] = b <= 9 ? ('0' + b) : ('7' + b);
959 		} else
960 			escaped[i++] = *s;
961 	}
962 
963 	return escaped;
964 }
965 
966 const char *
967 gotweb_action_name(int action)
968 {
969 	switch (action) {
970 	case BLAME:
971 		return "blame";
972 	case BLOB:
973 		return "blob";
974 	case BLOBRAW:
975 		return "blobraw";
976 	case BRIEFS:
977 		return "briefs";
978 	case COMMITS:
979 		return "commits";
980 	case DIFF:
981 		return "diff";
982 	case ERR:
983 		return "err";
984 	case INDEX:
985 		return "index";
986 	case SUMMARY:
987 		return "summary";
988 	case TAG:
989 		return "tag";
990 	case TAGS:
991 		return "tags";
992 	case TREE:
993 		return "tree";
994 	case RSS:
995 		return "rss";
996 	default:
997 		return NULL;
998 	}
999 }
1000 
1001 int
1002 gotweb_render_url(struct request *c, struct gotweb_url *url)
1003 {
1004 	const char *sep = "?", *action;
1005 	char *tmp;
1006 	int r;
1007 
1008 	action = gotweb_action_name(url->action);
1009 	if (action != NULL) {
1010 		if (fcgi_printf(c, "?action=%s", action) == -1)
1011 			return -1;
1012 		sep = "&";
1013 	}
1014 
1015 	if (url->commit) {
1016 		if (fcgi_printf(c, "%scommit=%s", sep, url->commit) == -1)
1017 			return -1;
1018 		sep = "&";
1019 	}
1020 
1021 	if (url->previd) {
1022 		if (fcgi_printf(c, "%sprevid=%s", sep, url->previd) == -1)
1023 			return -1;
1024 		sep = "&";
1025 	}
1026 
1027 	if (url->prevset) {
1028 		if (fcgi_printf(c, "%sprevset=%s", sep, url->prevset) == -1)
1029 			return -1;
1030 		sep = "&";
1031 	}
1032 
1033 	if (url->file) {
1034 		tmp = gotweb_urlencode(url->file);
1035 		if (tmp == NULL)
1036 			return -1;
1037 		r = fcgi_printf(c, "%sfile=%s", sep, tmp);
1038 		free(tmp);
1039 		if (r == -1)
1040 			return -1;
1041 		sep = "&";
1042 	}
1043 
1044 	if (url->folder) {
1045 		tmp = gotweb_urlencode(url->folder);
1046 		if (tmp == NULL)
1047 			return -1;
1048 		r = fcgi_printf(c, "%sfolder=%s", sep, tmp);
1049 		free(tmp);
1050 		if (r == -1)
1051 			return -1;
1052 		sep = "&";
1053 	}
1054 
1055 	if (url->headref) {
1056 		tmp = gotweb_urlencode(url->headref);
1057 		if (tmp == NULL)
1058 			return -1;
1059 		r = fcgi_printf(c, "%sheadref=%s", sep, url->headref);
1060 		free(tmp);
1061 		if (r == -1)
1062 			return -1;
1063 		sep = "&";
1064 	}
1065 
1066 	if (url->index_page != -1) {
1067 		if (fcgi_printf(c, "%sindex_page=%d", sep,
1068 		    url->index_page) == -1)
1069 			return -1;
1070 		sep = "&";
1071 	}
1072 
1073 	if (url->path) {
1074 		tmp = gotweb_urlencode(url->path);
1075 		if (tmp == NULL)
1076 			return -1;
1077 		r = fcgi_printf(c, "%spath=%s", sep, tmp);
1078 		free(tmp);
1079 		if (r == -1)
1080 			return -1;
1081 		sep = "&";
1082 	}
1083 
1084 	if (url->page != -1) {
1085 		if (fcgi_printf(c, "%spage=%d", sep, url->page) == -1)
1086 			return -1;
1087 		sep = "&";
1088 	}
1089 
1090 	return 0;
1091 }
1092 
1093 int
1094 gotweb_render_absolute_url(struct request *c, struct gotweb_url *url)
1095 {
1096 	struct template	*tp = c->tp;
1097 	const char	*proto = c->https ? "https" : "http";
1098 
1099 	if (fcgi_puts(tp, proto) == -1 ||
1100 	    fcgi_puts(tp, "://") == -1 ||
1101 	    tp_htmlescape(tp, c->server_name) == -1 ||
1102 	    tp_htmlescape(tp, c->document_uri) == -1)
1103 		return -1;
1104 
1105 	return gotweb_render_url(c, url);
1106 }
1107 
1108 static struct got_repository *
1109 find_cached_repo(struct server *srv, const char *path)
1110 {
1111 	int i;
1112 
1113 	for (i = 0; i < srv->ncached_repos; i++) {
1114 		if (strcmp(srv->cached_repos[i].path, path) == 0)
1115 			return srv->cached_repos[i].repo;
1116 	}
1117 
1118 	return NULL;
1119 }
1120 
1121 static const struct got_error *
1122 cache_repo(struct got_repository **new, struct server *srv,
1123     struct repo_dir *repo_dir, struct socket *sock)
1124 {
1125 	const struct got_error *error = NULL;
1126 	struct got_repository *repo;
1127 	struct cached_repo *cr;
1128 	int evicted = 0;
1129 
1130 	if (srv->ncached_repos >= GOTWEBD_REPO_CACHESIZE) {
1131 		cr = &srv->cached_repos[srv->ncached_repos - 1];
1132 		error = got_repo_close(cr->repo);
1133 		memset(cr, 0, sizeof(*cr));
1134 		srv->ncached_repos--;
1135 		if (error)
1136 			return error;
1137 		memmove(&srv->cached_repos[1], &srv->cached_repos[0],
1138 		    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1139 		cr = &srv->cached_repos[0];
1140 		evicted = 1;
1141 	} else {
1142 		cr = &srv->cached_repos[srv->ncached_repos];
1143 	}
1144 
1145 	error = got_repo_open(&repo, repo_dir->path, NULL, sock->pack_fds);
1146 	if (error) {
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 error;
1152 	}
1153 
1154 	if (strlcpy(cr->path, repo_dir->path, sizeof(cr->path))
1155 	    >= sizeof(cr->path)) {
1156 		if (evicted) {
1157 			memmove(&srv->cached_repos[0], &srv->cached_repos[1],
1158 			    srv->ncached_repos * sizeof(srv->cached_repos[0]));
1159 		}
1160 		return got_error(GOT_ERR_NO_SPACE);
1161 	}
1162 
1163 	cr->repo = repo;
1164 	srv->ncached_repos++;
1165 	*new = repo;
1166 	return NULL;
1167 }
1168 
1169 static const struct got_error *
1170 gotweb_load_got_path(struct request *c, struct repo_dir *repo_dir)
1171 {
1172 	const struct got_error *error = NULL;
1173 	struct socket *sock = c->sock;
1174 	struct server *srv = c->srv;
1175 	struct transport *t = c->t;
1176 	struct got_repository *repo = NULL;
1177 	DIR *dt;
1178 	char *dir_test;
1179 
1180 	if (asprintf(&dir_test, "%s/%s/%s", srv->repos_path, repo_dir->name,
1181 	    GOTWEB_GIT_DIR) == -1)
1182 		return got_error_from_errno("asprintf");
1183 
1184 	dt = opendir(dir_test);
1185 	if (dt == NULL) {
1186 		free(dir_test);
1187 	} else {
1188 		repo_dir->path = dir_test;
1189 		dir_test = NULL;
1190 		goto done;
1191 	}
1192 
1193 	if (asprintf(&dir_test, "%s/%s", srv->repos_path,
1194 	    repo_dir->name) == -1)
1195 		return got_error_from_errno("asprintf");
1196 
1197 	dt = opendir(dir_test);
1198 	if (dt == NULL) {
1199 		error = got_error_path(repo_dir->name, GOT_ERR_NOT_GIT_REPO);
1200 		goto err;
1201 	} else {
1202 		repo_dir->path = dir_test;
1203 		dir_test = NULL;
1204 	}
1205 
1206 done:
1207 	if (srv->respect_exportok &&
1208 	    faccessat(dirfd(dt), "git-daemon-export-ok", F_OK, 0) == -1) {
1209 		error = got_error_path(repo_dir->name, GOT_ERR_NOT_GIT_REPO);
1210 		goto err;
1211 	}
1212 
1213 	repo = find_cached_repo(srv, repo_dir->path);
1214 	if (repo == NULL) {
1215 		error = cache_repo(&repo, srv, repo_dir, sock);
1216 		if (error)
1217 			goto err;
1218 	}
1219 	t->repo = repo;
1220 	error = gotweb_get_repo_description(&repo_dir->description, srv,
1221 	    repo_dir->path, dirfd(dt));
1222 	if (error)
1223 		goto err;
1224 	error = got_get_repo_owner(&repo_dir->owner, c);
1225 	if (error)
1226 		goto err;
1227 	error = got_get_repo_age(&repo_dir->age, c, NULL);
1228 	if (error)
1229 		goto err;
1230 	error = gotweb_get_clone_url(&repo_dir->url, srv, repo_dir->path,
1231 	    dirfd(dt));
1232 err:
1233 	free(dir_test);
1234 	if (dt != NULL && closedir(dt) == EOF && error == NULL)
1235 		error = got_error_from_errno("closedir");
1236 	return error;
1237 }
1238 
1239 static const struct got_error *
1240 gotweb_init_repo_dir(struct repo_dir **repo_dir, const char *dir)
1241 {
1242 	const struct got_error *error;
1243 
1244 	*repo_dir = calloc(1, sizeof(**repo_dir));
1245 	if (*repo_dir == NULL)
1246 		return got_error_from_errno("calloc");
1247 
1248 	if (asprintf(&(*repo_dir)->name, "%s", dir) == -1) {
1249 		error = got_error_from_errno("asprintf");
1250 		free(*repo_dir);
1251 		*repo_dir = NULL;
1252 		return error;
1253 	}
1254 	(*repo_dir)->owner = NULL;
1255 	(*repo_dir)->description = NULL;
1256 	(*repo_dir)->url = NULL;
1257 	(*repo_dir)->path = NULL;
1258 
1259 	return NULL;
1260 }
1261 
1262 static const struct got_error *
1263 gotweb_get_repo_description(char **description, struct server *srv,
1264     const char *dirpath, int dir)
1265 {
1266 	const struct got_error *error = NULL;
1267 	struct stat sb;
1268 	int fd = -1;
1269 	off_t len;
1270 
1271 	*description = NULL;
1272 	if (srv->show_repo_description == 0)
1273 		return NULL;
1274 
1275 	fd = openat(dir, "description", O_RDONLY);
1276 	if (fd == -1) {
1277 		if (errno != ENOENT && errno != EACCES) {
1278 			error = got_error_from_errno_fmt("openat %s/%s",
1279 			    dirpath, "description");
1280 		}
1281 		goto done;
1282 	}
1283 
1284 	if (fstat(fd, &sb) == -1) {
1285 		error = got_error_from_errno_fmt("fstat %s/%s",
1286 		    dirpath, "description");
1287 		goto done;
1288 	}
1289 
1290 	len = sb.st_size;
1291 	if (len > GOTWEBD_MAXDESCRSZ - 1)
1292 		len = GOTWEBD_MAXDESCRSZ - 1;
1293 
1294 	*description = calloc(len + 1, sizeof(**description));
1295 	if (*description == NULL) {
1296 		error = got_error_from_errno("calloc");
1297 		goto done;
1298 	}
1299 
1300 	if (read(fd, *description, len) == -1)
1301 		error = got_error_from_errno("read");
1302 done:
1303 	if (fd != -1 && close(fd) == -1 && error == NULL)
1304 		error = got_error_from_errno("close");
1305 	return error;
1306 }
1307 
1308 static const struct got_error *
1309 gotweb_get_clone_url(char **url, struct server *srv, const char *dirpath,
1310     int dir)
1311 {
1312 	const struct got_error *error = NULL;
1313 	struct stat sb;
1314 	int fd = -1;
1315 	off_t len;
1316 
1317 	*url = NULL;
1318 	if (srv->show_repo_cloneurl == 0)
1319 		return NULL;
1320 
1321 	fd = openat(dir, "cloneurl", O_RDONLY);
1322 	if (fd == -1) {
1323 		if (errno != ENOENT && errno != EACCES) {
1324 			error = got_error_from_errno_fmt("openat %s/%s",
1325 			    dirpath, "cloneurl");
1326 		}
1327 		goto done;
1328 	}
1329 
1330 	if (fstat(fd, &sb) == -1) {
1331 		error = got_error_from_errno_fmt("fstat %s/%s",
1332 		    dirpath, "cloneurl");
1333 		goto done;
1334 	}
1335 
1336 	len = sb.st_size;
1337 	if (len > GOTWEBD_MAXCLONEURLSZ - 1)
1338 		len = GOTWEBD_MAXCLONEURLSZ - 1;
1339 
1340 	*url = calloc(len + 1, sizeof(**url));
1341 	if (*url == NULL) {
1342 		error = got_error_from_errno("calloc");
1343 		goto done;
1344 	}
1345 
1346 	if (read(fd, *url, len) == -1)
1347 		error = got_error_from_errno("read");
1348 done:
1349 	if (fd != -1 && close(fd) == -1 && error == NULL)
1350 		error = got_error_from_errno("close");
1351 	return error;
1352 }
1353 
1354 int
1355 gotweb_render_age(struct template *tp, time_t committer_time, int ref_tm)
1356 {
1357 	struct request *c = tp->tp_arg;
1358 	struct tm tm;
1359 	long long diff_time;
1360 	const char *years = "years ago", *months = "months ago";
1361 	const char *weeks = "weeks ago", *days = "days ago";
1362 	const char *hours = "hours ago",  *minutes = "minutes ago";
1363 	const char *seconds = "seconds ago", *now = "right now";
1364 	char *s;
1365 	char datebuf[64];
1366 	size_t r;
1367 
1368 	switch (ref_tm) {
1369 	case TM_DIFF:
1370 		diff_time = time(NULL) - committer_time;
1371 		if (diff_time > 60 * 60 * 24 * 365 * 2) {
1372 			if (fcgi_printf(c, "%lld %s",
1373 			    (diff_time / 60 / 60 / 24 / 365), years) == -1)
1374 				return -1;
1375 		} else if (diff_time > 60 * 60 * 24 * (365 / 12) * 2) {
1376 			if (fcgi_printf(c, "%lld %s",
1377 			    (diff_time / 60 / 60 / 24 / (365 / 12)),
1378 			    months) == -1)
1379 				return -1;
1380 		} else if (diff_time > 60 * 60 * 24 * 7 * 2) {
1381 			if (fcgi_printf(c, "%lld %s",
1382 			    (diff_time / 60 / 60 / 24 / 7), weeks) == -1)
1383 				return -1;
1384 		} else if (diff_time > 60 * 60 * 24 * 2) {
1385 			if (fcgi_printf(c, "%lld %s",
1386 			    (diff_time / 60 / 60 / 24), days) == -1)
1387 				return -1;
1388 		} else if (diff_time > 60 * 60 * 2) {
1389 			if (fcgi_printf(c, "%lld %s",
1390 			    (diff_time / 60 / 60), hours) == -1)
1391 				return -1;
1392 		} else if (diff_time > 60 * 2) {
1393 			if (fcgi_printf(c, "%lld %s", (diff_time / 60),
1394 			    minutes) == -1)
1395 				return -1;
1396 		} else if (diff_time > 2) {
1397 			if (fcgi_printf(c, "%lld %s", diff_time,
1398 			    seconds) == -1)
1399 				return -1;
1400 		} else {
1401 			if (fcgi_puts(tp, now) == -1)
1402 				return -1;
1403 		}
1404 		break;
1405 	case TM_LONG:
1406 		if (gmtime_r(&committer_time, &tm) == NULL)
1407 			return -1;
1408 
1409 		s = asctime_r(&tm, datebuf);
1410 		if (s == NULL)
1411 			return -1;
1412 
1413 		if (fcgi_puts(tp, datebuf) == -1 ||
1414 		    fcgi_puts(tp, " UTC") == -1)
1415 			return -1;
1416 		break;
1417 	case TM_RFC822:
1418 		if (gmtime_r(&committer_time, &tm) == NULL)
1419 			return -1;
1420 
1421 		r = strftime(datebuf, sizeof(datebuf),
1422 		    "%a, %d %b %Y %H:%M:%S GMT", &tm);
1423 		if (r == 0)
1424 			return -1;
1425 
1426 		if (fcgi_puts(tp, datebuf) == -1)
1427 			return -1;
1428 		break;
1429 	}
1430 	return 0;
1431 }