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Date:: Wed Nov 24 17:37:32 2021 UTC
Message:: fix crash at strlcpy on macos
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1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "compat.h"
18 
19 #include <sys/socket.h>
20 #include <sys/wait.h>
21 
22 #include <errno.h>
23 #include <getopt.h>
24 #include <signal.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <unistd.h>
29 
30 #include "defaults.h"
31 #include "fs.h"
32 #include "minibuffer.h"
33 #include "parser.h"
34 #include "session.h"
35 #include "telescope.h"
36 #include "ui.h"
37 
38 static struct option longopts[] = {
39 	{"colors",	no_argument,	NULL,	'c'},
40 	{"help",	no_argument,	NULL,	'h'},
41 	{"safe",	no_argument,	NULL,	'S'},
42 	{"version",	no_argument,	NULL,	'v'},
43 	{NULL,		0,		NULL,	0},
44 };
45 
46 static const char *opts = "Cc:hnST:v";
47 
48 /*
49  * Used to know when we're finished loading.
50  */
51 int			 operating;
52 
53 /*
54  * "Safe" (or "sandobox") mode.  If enabled, Telescope shouldn't write
55  * anything to the filesystem or execute external programs.
56  */
57 int			safe_mode;
58 
59 static struct imsgev	*iev_fs, *iev_net;
60 
61 struct tabshead		 tabshead = TAILQ_HEAD_INITIALIZER(tabshead);
62 struct proxylist	 proxies = TAILQ_HEAD_INITIALIZER(proxies);
63 
64 enum telescope_process {
65 	PROC_UI,
66 	PROC_FS,
67 	PROC_NET,
68 };
69 
70 #define CANNOT_FETCH		0
71 #define TOO_MUCH_REDIRECTS	1
72 #define MALFORMED_RESPONSE	2
73 #define UNKNOWN_TYPE_OR_CSET	3
74 #define UNKNOWN_PROTOCOL	4
75 
76 /* XXX: keep in sync with normalize_code */
77 const char *err_pages[70] = {
78 	[CANNOT_FETCH]		= "# Couldn't load the page\n",
79 	[TOO_MUCH_REDIRECTS]	= "# Too much redirects\n",
80 	[MALFORMED_RESPONSE]	= "# Got a malformed response\n",
81 	[UNKNOWN_TYPE_OR_CSET]	= "# Unsupported type or charset\n",
82 	[UNKNOWN_PROTOCOL]	= "# Unknown protocol\n",
83 
84 	[10] = "# Input required\n",
85 	[11] = "# Input required\n",
86 	[40] = "# Temporary failure\n",
87 	[41] = "# Server unavailable\n",
88 	[42] = "# CGI error\n",
89 	[43] = "# Proxy error\n",
90 	[44] = "# Slow down\n",
91 	[50] = "# Permanent failure\n",
92 	[51] = "# Not found\n",
93 	[52] = "# Gone\n",
94 	[53] = "# Proxy request refused\n",
95 	[59] = "# Bad request\n",
96 	[60] = "# Client certificate required\n",
97 	[61] = "# Certificate not authorised\n",
98 	[62] = "# Certificate not valid\n"
99 };
100 
101 static void		 die(void) __attribute__((__noreturn__));
102 static struct tab	*tab_by_id(uint32_t);
103 static void		 handle_imsg_err(struct imsg *, size_t);
104 static void		 handle_imsg_check_cert(struct imsg *, size_t);
105 static void		 handle_check_cert_user_choice(int, struct tab *);
106 static void		 handle_maybe_save_new_cert(int, struct tab *);
107 static void		 handle_imsg_got_code(struct imsg *, size_t);
108 static void		 handle_imsg_got_meta(struct imsg *, size_t);
109 static void		 handle_maybe_save_page(int, struct tab *);
110 static void		 handle_save_page_path(const char *, struct tab *);
111 static void		 handle_imsg_file_opened(struct imsg *, size_t);
112 static void		 handle_imsg_buf(struct imsg *, size_t);
113 static void		 handle_imsg_eof(struct imsg *, size_t);
114 static void		 handle_imsg_bookmark_ok(struct imsg *, size_t);
115 static void		 handle_imsg_save_cert_ok(struct imsg *, size_t);
116 static void		 handle_imsg_update_cert_ok(struct imsg *, size_t);
117 static void		 handle_dispatch_imsg(int, short, void *);
118 static int		 load_about_url(struct tab *, const char *);
119 static int		 load_file_url(struct tab *, const char *);
120 static int		 load_finger_url(struct tab *, const char *);
121 static int		 load_gemini_url(struct tab *, const char *);
122 static int		 load_gopher_url(struct tab *, const char *);
123 static int		 load_via_proxy(struct tab *, const char *,
124 			     struct proxy *);
125 static int		 make_request(struct tab *, struct get_req *, int,
126 			     const char *);
127 static int		 make_fs_request(struct tab *, int, const char *);
128 static int		 do_load_url(struct tab *, const char *, const char *);
129 static pid_t		 start_child(enum telescope_process, const char *, int);
130 
131 static struct proto {
132 	const char	*schema;
133 	const char	*port;
134 	int		 (*loadfn)(struct tab *, const char *);
135 } protos[] = {
136 	{"about",	NULL,	load_about_url},
137 	{"file",	NULL,	load_file_url},
138 	{"finger",	"79",	load_finger_url},
139 	{"gemini",	"1965",	load_gemini_url},
140 	{"gopher",	"70",	load_gopher_url},
141 	{NULL, NULL, NULL},
142 };
143 
144 static imsg_handlerfn *handlers[] = {
145 	[IMSG_ERR] = handle_imsg_err,
146 	[IMSG_CHECK_CERT] = handle_imsg_check_cert,
147 	[IMSG_GOT_CODE] = handle_imsg_got_code,
148 	[IMSG_GOT_META] = handle_imsg_got_meta,
149 	[IMSG_BUF] = handle_imsg_buf,
150 	[IMSG_EOF] = handle_imsg_eof,
151 	[IMSG_BOOKMARK_OK] = handle_imsg_bookmark_ok,
152 	[IMSG_SAVE_CERT_OK] = handle_imsg_save_cert_ok,
153 	[IMSG_UPDATE_CERT_OK] = handle_imsg_update_cert_ok,
154 	[IMSG_FILE_OPENED] = handle_imsg_file_opened,
155 };
156 
157 static struct ohash	certs;
158 
159 static void __attribute__((__noreturn__))
160 die(void)
161 {
162 	abort(); 		/* TODO */
163 }
164 
165 static struct tab *
166 tab_by_id(uint32_t id)
167 {
168 	struct tab *t;
169 
170 	TAILQ_FOREACH(t, &tabshead, tabs) {
171 		if (t->id == id)
172 			return t;
173 	}
174 
175 	return NULL;
176 }
177 
178 static void
179 handle_imsg_err(struct imsg *imsg, size_t datalen)
180 {
181 	struct tab	*tab;
182 	char		*page;
183 
184 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
185 		return;
186 
187 	page = imsg->data;
188 	page[datalen-1] = '\0';
189 
190 	if (asprintf(&page, "# Error loading %s\n\n> %s\n",
191 	    tab->hist_cur->h, page) == -1)
192 		die();
193 	load_page_from_str(tab, page);
194 	free(page);
195 }
196 
197 static void
198 handle_imsg_check_cert(struct imsg *imsg, size_t datalen)
199 {
200 	const char		*hash, *host, *port;
201 	int			 tofu_res;
202 	struct tofu_entry	*e;
203 	struct tab		*tab;
204 
205 	hash = imsg->data;
206 	if (hash[datalen-1] != '\0')
207 		abort();
208 
209 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
210 		return;
211 
212 	if (tab->proxy != NULL) {
213 		host = tab->proxy->host;
214 		port = tab->proxy->port;
215 	} else {
216 		host = tab->uri.host;
217 		port = tab->uri.port;
218 	}
219 
220 	if ((e = tofu_lookup(&certs, host, port)) == NULL) {
221 		/* TODO: an update in libressl/libretls changed
222 		 * significantly.  Find a better approach at storing
223 		 * the certs! */
224 		if (datalen > sizeof(e->hash))
225 			abort();
226 
227 		tofu_res = 1;	/* trust on first use */
228 		if ((e = calloc(1, sizeof(*e))) == NULL)
229 			abort();
230 		strlcpy(e->domain, host, sizeof(e->domain));
231 		if (*port != '\0' && strcmp(port, "1965")) {
232 			strlcat(e->domain, ":", sizeof(e->domain));
233 			strlcat(e->domain, port, sizeof(e->domain));
234 		}
235 		strlcpy(e->hash, hash, sizeof(e->hash));
236 		tofu_add(&certs, e);
237 		ui_send_fs(IMSG_SAVE_CERT, tab->id, e, sizeof(*e));
238 	} else
239 		tofu_res = !strcmp(hash, e->hash);
240 
241 	if (tofu_res) {
242 		if (e->verified == -1)
243 			tab->trust = TS_TEMP_TRUSTED;
244 		else if (e->verified == 1)
245 			tab->trust = TS_VERIFIED;
246 		else
247 			tab->trust = TS_TRUSTED;
248 
249 		ui_send_net(IMSG_CERT_STATUS, imsg->hdr.peerid,
250 		    &tofu_res, sizeof(tofu_res));
251 	} else {
252 		tab->trust = TS_UNTRUSTED;
253 		load_page_from_str(tab, "# Certificate mismatch\n");
254 		if ((tab->cert = strdup(hash)) == NULL)
255 			die();
256 		ui_yornp("Certificate mismatch.  Proceed?",
257 		    handle_check_cert_user_choice, tab);
258 	}
259 }
260 
261 static void
262 handle_check_cert_user_choice(int accept, struct tab *tab)
263 {
264 	ui_send_net(IMSG_CERT_STATUS, tab->id, &accept,
265 	    sizeof(accept));
266 
267 	if (accept) {
268 		/*
269 		 * trust the certificate for this session only.  If
270 		 * the page results in a redirect while we're asking
271 		 * the user to save, we'll end up with an invalid
272 		 * tabid (one request == one tab id).  It also makes
273 		 * sense to save it for the current session if the
274 		 * user accepted it.
275 		 */
276 		tofu_temp_trust(&certs, tab->uri.host, tab->uri.port,
277 		    tab->cert);
278 
279 		if (!safe_mode)
280 			ui_yornp("Save the new certificate?",
281 			    handle_maybe_save_new_cert, tab);
282 		else
283 			message("Certificate temporarly trusted");
284 	} else {
285 		free(tab->cert);
286 		tab->cert = NULL;
287 	}
288 }
289 
290 static void
291 handle_maybe_save_new_cert(int accept, struct tab *tab)
292 {
293 	struct tofu_entry *e;
294 	const char *host, *port;
295 
296 	if (tab->proxy != NULL) {
297 		host = tab->proxy->host;
298 		port = tab->proxy->port;
299 	} else {
300 		host = tab->uri.host;
301 		port = tab->uri.port;
302 	}
303 
304 	if (!accept)
305 		goto end;
306 
307 	if ((e = calloc(1, sizeof(*e))) == NULL)
308 		die();
309 
310 	strlcpy(e->domain, host, sizeof(e->domain));
311 	if (*port != '\0' && strcmp(port, "1965")) {
312 		strlcat(e->domain, ":", sizeof(e->domain));
313 		strlcat(e->domain, port, sizeof(e->domain));
314 	}
315 	strlcpy(e->hash, tab->cert, sizeof(e->hash));
316 	ui_send_fs(IMSG_UPDATE_CERT, 0, e, sizeof(*e));
317 
318 	tofu_update(&certs, e);
319 
320 	tab->trust = TS_TRUSTED;
321 
322 end:
323 	free(tab->cert);
324 	tab->cert = NULL;
325 }
326 
327 static inline int
328 normalize_code(int n)
329 {
330 	if (n < 20) {
331 		if (n == 10 || n == 11)
332 			return n;
333 		return 10;
334 	} else if (n < 30) {
335 		return 20;
336 	} else if (n < 40) {
337 		if (n == 30 || n == 31)
338 			return n;
339 		return 30;
340 	} else if (n < 50) {
341 		if (n <= 44)
342 			return n;
343 		return 40;
344 	} else if (n < 60) {
345 		if (n <= 53 || n == 59)
346 			return n;
347 		return 50;
348 	} else if (n < 70) {
349 		if (n <= 62)
350 			return n;
351 		return 60;
352 	} else
353 		return MALFORMED_RESPONSE;
354 }
355 
356 static void
357 handle_imsg_got_code(struct imsg *imsg, size_t datalen)
358 {
359 	struct tab	*tab;
360 
361 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
362 		return;
363 
364 	if (sizeof(tab->code) != datalen)
365 		die();
366 
367 	memcpy(&tab->code, imsg->data, sizeof(tab->code));
368 	tab->code = normalize_code(tab->code);
369 	if (tab->code != 30 && tab->code != 31)
370 		tab->redirect_count = 0;
371 }
372 
373 static void
374 handle_imsg_got_meta(struct imsg *imsg, size_t datalen)
375 {
376 	struct tab	*tab;
377 	char		 buf[128];
378 
379 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
380 		return;
381 
382 	if (sizeof(tab->meta) <= datalen)
383 		die();
384 
385 	memcpy(tab->meta, imsg->data, datalen);
386 
387 	if (tab->code < 10) {	/* internal errors */
388 		load_page_from_str(tab, err_pages[tab->code]);
389 	} else if (tab->code < 20) {	/* 1x */
390 		load_page_from_str(tab, err_pages[tab->code]);
391 		ui_require_input(tab, tab->code == 11, PROTO_GEMINI);
392 	} else if (tab->code == 20) {
393 		if (setup_parser_for(tab)) {
394 			ui_send_net(IMSG_PROCEED, tab->id, NULL, 0);
395 		} else if (safe_mode) {
396 			load_page_from_str(tab,
397 			    err_pages[UNKNOWN_TYPE_OR_CSET]);
398 		} else {
399 			struct hist *h;
400 
401 			if ((h = hist_pop(&tab->hist)) != NULL)
402 				tab->hist_cur = h;
403 			snprintf(buf, sizeof(buf),
404 			    "Can't display \"%s\", save it?", tab->meta);
405 			ui_yornp(buf, handle_maybe_save_page, tab);
406 		}
407 	} else if (tab->code < 40) { /* 3x */
408 		tab->redirect_count++;
409 
410 		/* TODO: make customizable? */
411 		if (tab->redirect_count > 5) {
412 			load_page_from_str(tab,
413 			    err_pages[TOO_MUCH_REDIRECTS]);
414 		} else
415 			do_load_url(tab, tab->meta, NULL);
416 	} else { /* 4x, 5x & 6x */
417 		load_page_from_str(tab, err_pages[tab->code]);
418 	}
419 }
420 
421 static void
422 handle_maybe_save_page(int dosave, struct tab *tab)
423 {
424 	const char	*f;
425 	char		 input[PATH_MAX];
426 
427 	/* XXX: this print a message that is confusing  */
428 	ui_on_tab_loaded(tab);
429 
430 	if (!dosave) {
431 		stop_tab(tab);
432 		return;
433 	}
434 
435 	if ((f = strrchr(tab->uri.path, '/')) == NULL)
436 		f = "";
437 	else
438 		f++;
439 
440 	strlcpy(input, download_path, sizeof(input));
441 	strlcat(input, f, sizeof(input));
442 
443 	ui_read("Save to path", handle_save_page_path, tab, input);
444 }
445 
446 static void
447 handle_save_page_path(const char *path, struct tab *tab)
448 {
449 	if (path == NULL) {
450 		stop_tab(tab);
451 		return;
452 	}
453 
454 	ui_show_downloads_pane();
455 
456 	enqueue_download(tab->id, path);
457 	ui_send_fs(IMSG_FILE_OPEN, tab->id, path, strlen(path)+1);
458 
459 	/*
460 	 * Change this tab id, the old one is associated with the
461 	 * download now.
462 	 */
463 	tab->id = tab_new_id();
464 }
465 
466 static void
467 handle_imsg_file_opened(struct imsg *imsg, size_t datalen)
468 {
469 	struct download	*d;
470 	const char	*e;
471 
472 	/*
473 	 * There are no reason we shouldn't be able to find the
474 	 * required download.
475 	 */
476 	if ((d = download_by_id(imsg->hdr.peerid)) == NULL)
477 		die();
478 
479 	if (imsg->fd == -1) {
480 		e = imsg->data;
481 		if (e[datalen-1] != '\0')
482 			die();
483 		message("Can't open file %s: %s", d->path, e);
484 	} else {
485 		d->fd = imsg->fd;
486 		ui_send_net(IMSG_PROCEED, d->id, NULL, 0);
487 	}
488 }
489 
490 static void
491 handle_imsg_buf(struct imsg *imsg, size_t datalen)
492 {
493 	struct tab	*tab = NULL;
494 	struct download	*d = NULL;
495 
496 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL &&
497 	    (d = download_by_id(imsg->hdr.peerid)) == NULL)
498 		return;
499 
500 	if (tab != NULL) {
501 		if (!parser_parse(tab, imsg->data, datalen))
502 			die();
503 		ui_on_tab_refresh(tab);
504 	} else {
505 		d->bytes += datalen;
506 		write(d->fd, imsg->data, datalen);
507 		ui_on_download_refresh();
508 	}
509 }
510 
511 static void
512 handle_imsg_eof(struct imsg *imsg, size_t datalen)
513 {
514 	struct tab	*tab = NULL;
515 	struct download	*d = NULL;
516 
517 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL &&
518 	    (d = download_by_id(imsg->hdr.peerid)) == NULL)
519 		return;
520 
521 	if (tab != NULL) {
522 		if (!parser_free(tab))
523 			die();
524 		ui_on_tab_refresh(tab);
525 		ui_on_tab_loaded(tab);
526 	} else {
527 		close(d->fd);
528 		d->fd = -1;
529 		ui_on_download_refresh();
530 	}
531 }
532 
533 static void
534 handle_imsg_bookmark_ok(struct imsg *imsg, size_t datalen)
535 {
536 	int res;
537 
538 	if (datalen != sizeof(res))
539 		die();
540 
541 	memcpy(&res, imsg->data, sizeof(res));
542 	if (res == 0)
543 		message("Added to bookmarks!");
544 	else
545 		message("Failed to add to bookmarks: %s",
546 		    strerror(res));
547 }
548 
549 static void
550 handle_imsg_save_cert_ok(struct imsg *imsg, size_t datalen)
551 {
552 	int res;
553 
554 	if (datalen != sizeof(res))
555 		die();
556 	memcpy(&res, imsg->data, datalen);
557 	if (res != 0)
558 		message("Failed to save the cert for: %s",
559 		    strerror(res));
560 }
561 
562 static void
563 handle_imsg_update_cert_ok(struct imsg *imsg, size_t datalen)
564 {
565 	int res;
566 
567 	if (datalen != sizeof(res))
568 		die();
569 	memcpy(&res, imsg->data, datalen);
570 	if (!res)
571 		message("Failed to update the certificate");
572 }
573 
574 static void
575 handle_dispatch_imsg(int fd, short ev, void *d)
576 {
577 	struct imsgev	*iev = d;
578 
579 	if (dispatch_imsg(iev, ev, handlers, sizeof(handlers)) == -1)
580 		err(1, "connection closed");
581 }
582 
583 static int
584 load_about_url(struct tab *tab, const char *url)
585 {
586 	tab->trust = TS_UNKNOWN;
587 	parser_init(tab, gemtext_initparser);
588 	return make_fs_request(tab, IMSG_GET, url);
589 }
590 
591 static int
592 load_file_url(struct tab *tab, const char *url)
593 {
594 	tab->trust = TS_UNKNOWN;
595 	return make_fs_request(tab, IMSG_GET_FILE, tab->uri.path);
596 }
597 
598 static int
599 load_finger_url(struct tab *tab, const char *url)
600 {
601 	struct get_req	 req;
602 	size_t		 len;
603 	char		*at;
604 
605 	memset(&req, 0, sizeof(req));
606 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
607 
608 	/*
609 	 * Sometimes the finger url have the user as path component
610 	 * (e.g. finger://thelambdalab.xyz/plugd), sometimes as
611 	 * userinfo (e.g. finger://cobradile@finger.farm).
612 	 */
613 	if ((at = strchr(tab->uri.host, '@')) != NULL) {
614 		len = at - tab->uri.host;
615 		memcpy(req.req, tab->uri.host, len);
616 
617 		if (len >= sizeof(req.req))
618 			die();
619 		req.req[len] = '\0';
620 
621 		strlcpy(req.host, at+1, sizeof(req.host));
622 	} else {
623 		strlcpy(req.host, tab->uri.host, sizeof(req.host));
624 
625 		/* +1 to skip the initial `/' */
626 		strlcpy(req.req, tab->uri.path+1, sizeof(req.req));
627 	}
628 	strlcat(req.req, "\r\n", sizeof(req.req));
629 
630 	parser_init(tab, textplain_initparser);
631 	return make_request(tab, &req, PROTO_FINGER, NULL);
632 }
633 
634 static int
635 load_gemini_url(struct tab *tab, const char *url)
636 {
637 	struct get_req	 req;
638 
639 	memset(&req, 0, sizeof(req));
640 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
641 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
642 
643 	return make_request(tab, &req, PROTO_GEMINI, tab->hist_cur->h);
644 }
645 
646 static inline const char *
647 gopher_skip_selector(const char *path, int *ret_type)
648 {
649 	*ret_type = 0;
650 
651 	if (!strcmp(path, "/") || *path == '\0') {
652 		*ret_type = '1';
653 		return path;
654 	}
655 
656 	if (*path != '/')
657 		return path;
658 	path++;
659 
660 	switch (*ret_type = *path) {
661 	case '0':
662 	case '1':
663 	case '7':
664 		break;
665 
666 	default:
667 		*ret_type = 0;
668 		path -= 1;
669 		return path;
670 	}
671 
672 	return ++path;
673 }
674 
675 static int
676 load_gopher_url(struct tab *tab, const char *url)
677 {
678 	struct get_req	 req;
679 	int		 type;
680 	const char	*path;
681 
682 	memset(&req, 0, sizeof(req));
683 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
684 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
685 
686 	path = gopher_skip_selector(tab->uri.path, &type);
687 	switch (type) {
688 	case '0':
689 		parser_init(tab, textplain_initparser);
690 		break;
691 	case '1':
692 		parser_init(tab, gophermap_initparser);
693 		break;
694 	case '7':
695 		ui_require_input(tab, 0, PROTO_GOPHER);
696 		return load_page_from_str(tab, err_pages[10]);
697 	default:
698 		return load_page_from_str(tab, "Unknown gopher selector");
699 	}
700 
701 	strlcpy(req.req, path, sizeof(req.req));
702 	if (*tab->uri.query != '\0') {
703 		strlcat(req.req, "?", sizeof(req.req));
704 		strlcat(req.req, tab->uri.query, sizeof(req.req));
705 	}
706 	strlcat(req.req, "\r\n", sizeof(req.req));
707 
708 	return make_request(tab, &req, PROTO_GOPHER, NULL);
709 }
710 
711 static int
712 load_via_proxy(struct tab *tab, const char *url, struct proxy *p)
713 {
714 	struct get_req req;
715 
716 	memset(&req, 0, sizeof(req));
717 	strlcpy(req.host, p->host, sizeof(req.host));
718 	strlcpy(req.port, p->port, sizeof(req.port));
719 
720 	tab->proxy = p;
721 
722 	return make_request(tab, &req, p->proto, tab->hist_cur->h);
723 }
724 
725 static int
726 make_request(struct tab *tab, struct get_req *req, int proto, const char *r)
727 {
728 	stop_tab(tab);
729 	tab->id = tab_new_id();
730 	req->proto = proto;
731 
732 	if (r != NULL) {
733 		strlcpy(req->req, r, sizeof(req->req));
734 		strlcat(req->req, "\r\n", sizeof(req->req));
735 	}
736 
737 	ui_send_net(IMSG_GET_RAW, tab->id, req, sizeof(*req));
738 
739 	/*
740 	 * So the various load_*_url can `return make_request` and
741 	 * do_load_url is happy.
742 	 */
743 	return 1;
744 }
745 
746 static int
747 make_fs_request(struct tab *tab, int type, const char *r)
748 {
749 	stop_tab(tab);
750 	tab->id = tab_new_id();
751 
752 	ui_send_fs(type, tab->id, r, strlen(r)+1);
753 
754 	/*
755 	 * So load_{about,file}_url can `return make_fs_request` and
756 	 * do_load_url is happy.
757 	 */
758 	return 1;
759 }
760 
761 void
762 gopher_send_search_req(struct tab *tab, const char *text)
763 {
764 	struct get_req	req;
765 
766 	start_loading_anim(tab);
767 
768 	memset(&req, 0, sizeof(req));
769 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
770 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
771 
772 	/* +2 to skip /7 */
773 	strlcpy(req.req, tab->uri.path+2, sizeof(req.req));
774 	if (*tab->uri.query != '\0') {
775 		strlcat(req.req, "?", sizeof(req.req));
776 		strlcat(req.req, tab->uri.query, sizeof(req.req));
777 	}
778 
779 	strlcat(req.req, "\t", sizeof(req.req));
780 	strlcat(req.req, text, sizeof(req.req));
781 	strlcat(req.req, "\r\n", sizeof(req.req));
782 
783 	erase_buffer(&tab->buffer);
784 	parser_init(tab, gophermap_initparser);
785 
786 	make_request(tab, &req, PROTO_GOPHER, NULL);
787 }
788 
789 /*
790  * Effectively load the given url in the given tab.  Return 1 when
791  * loading the page asynchronously, and thus when an erase_buffer can
792  * be done right after this function return, or 0 when loading the
793  * page synchronously.
794  */
795 static int
796 do_load_url(struct tab *tab, const char *url, const char *base)
797 {
798 	struct phos_uri	 uri;
799 	struct proto	*p;
800 	struct proxy	*proxy;
801 	char		*t;
802 
803 	tab->proxy = NULL;
804 
805 	tab->trust = TS_UNKNOWN;
806 
807 	if (base == NULL)
808 		memcpy(&uri, &tab->uri, sizeof(tab->uri));
809 	else
810 		phos_parse_absolute_uri(base, &uri);
811 
812 	if (!phos_resolve_uri_from_str(&uri, url, &tab->uri)) {
813 		if (asprintf(&t, "#error loading %s\n>%s\n",
814 		    url, "Can't parse the URI") == -1)
815 			die();
816 		strlcpy(tab->hist_cur->h, url, sizeof(tab->hist_cur->h));
817 		load_page_from_str(tab, t);
818 		free(t);
819 		return 0;
820 	}
821 
822 	phos_serialize_uri(&tab->uri, tab->hist_cur->h,
823 	    sizeof(tab->hist_cur->h));
824 
825 	for (p = protos; p->schema != NULL; ++p) {
826 		if (!strcmp(tab->uri.scheme, p->schema)) {
827 			/* patch the port */
828 			if (*tab->uri.port == '\0' && p->port != NULL)
829 				strlcpy(tab->uri.port, p->port,
830 				    sizeof(tab->uri.port));
831 
832 			return p->loadfn(tab, url);
833 		}
834 	}
835 
836 	TAILQ_FOREACH(proxy, &proxies, proxies) {
837 		if (!strcmp(tab->uri.scheme, proxy->match_proto))
838 			return load_via_proxy(tab, url, proxy);
839 	}
840 
841 	return load_page_from_str(tab, err_pages[UNKNOWN_PROTOCOL]);
842 }
843 
844 /*
845  * Load url in tab.  If tab is marked as lazy, only prepare the url
846  * but don't load it.  If tab is lazy and a url was already prepared,
847  * do load it!
848  */
849 void
850 load_url(struct tab *tab, const char *url, const char *base, int nohist)
851 {
852 	int lazy;
853 
854 	lazy = tab->flags & TAB_LAZY;
855 
856 	if (lazy && tab->hist_cur != NULL) {
857 		lazy = 0;
858 		tab->flags &= ~TAB_LAZY;
859 	}
860 
861 	/* can't have both nohist and lazy at the same time. */
862 	if (nohist && lazy)
863 		nohist = 0;
864 
865 	if (!nohist && (!lazy || tab->hist_cur == NULL)) {
866 		if (tab->hist_cur != NULL)
867 			hist_clear_forward(&tab->hist,
868 			    TAILQ_NEXT(tab->hist_cur, entries));
869 
870 		if ((tab->hist_cur = calloc(1, sizeof(*tab->hist_cur)))
871 		    == NULL) {
872 			event_loopbreak();
873 			return;
874 		}
875 
876 		strlcpy(tab->buffer.page.title, url,
877 		    sizeof(tab->buffer.page.title));
878 		hist_push(&tab->hist, tab->hist_cur);
879 
880 		if (lazy)
881 			strlcpy(tab->hist_cur->h, url,
882 			    sizeof(tab->hist_cur->h));
883 	}
884 
885 	if (!lazy)
886 		do_load_url(tab, url, base);
887 }
888 
889 void
890 load_url_in_tab(struct tab *tab, const char *url, const char *base, int nohist)
891 {
892 	if (!operating) {
893 		load_url(tab, url, base, nohist);
894 		return;
895 	}
896 
897 	autosave_hook();
898 
899 	message("Loading %s...", url);
900 	start_loading_anim(tab);
901 	load_url(tab, url, base, nohist);
902 }
903 
904 int
905 load_previous_page(struct tab *tab)
906 {
907 	struct hist	*h;
908 
909 	if ((h = TAILQ_PREV(tab->hist_cur, mhisthead, entries)) == NULL)
910 		return 0;
911 	tab->hist_cur = h;
912 	do_load_url(tab, h->h, NULL);
913 	return 1;
914 }
915 
916 int
917 load_next_page(struct tab *tab)
918 {
919 	struct hist	*h;
920 
921 	if ((h = TAILQ_NEXT(tab->hist_cur, entries)) == NULL)
922 		return 0;
923 	tab->hist_cur = h;
924 	do_load_url(tab, h->h, NULL);
925 	return 1;
926 }
927 
928 void
929 add_to_bookmarks(const char *str)
930 {
931 	ui_send_fs(IMSG_BOOKMARK_PAGE, 0,
932 	    str, strlen(str)+1);
933 }
934 
935 /*
936  *  Given a user-entered URL, apply some heuristics to use it:
937  *
938  *  - if it's a proper url use it
939  *  - if it starts with a `./' or a `/' assume its a file:// url
940  *  - assume it's a gemini:// url
941  *
942  *  `ret' (of which len is the size) will be filled with the resulting
943  *  url.
944  */
945 void
946 humanify_url(const char *raw, char *ret, size_t len)
947 {
948 	struct phos_uri	uri;
949 	char		buf[PATH_MAX];
950 
951 	if (phos_parse_absolute_uri(raw, &uri)) {
952 		strlcpy(ret, raw, len);
953 		return;
954 	}
955 
956 	if (has_prefix(raw, "./")) {
957 		strlcpy(ret, "file://", len);
958 		getcwd(buf, sizeof(buf));
959 		strlcat(ret, buf, len);
960 		strlcat(ret, "/", len);
961 		strlcat(ret, raw+2, len);
962 		return;
963 	}
964 
965 	if (*raw == '/') {
966 		strlcpy(ret, "file://", len);
967 		strlcat(ret, raw, len);
968 		return;
969 	}
970 
971 	strlcpy(ret, "gemini://", len);
972 	strlcat(ret, raw, len);
973 }
974 
975 static pid_t
976 start_child(enum telescope_process p, const char *argv0, int fd)
977 {
978 	const char	*argv[5];
979 	int		 argc = 0;
980 	pid_t		 pid;
981 
982 	switch (pid = fork()) {
983 	case -1:
984 		die();
985 	case 0:
986 		break;
987 	default:
988 		close(fd);
989 		return pid;
990 	}
991 
992 	if (dup2(fd, 3) == -1)
993 		err(1, "cannot setup imsg fd");
994 
995 	argv[argc++] = argv0;
996 	switch (p) {
997 	case PROC_UI:
998 		errx(1, "Can't start ui process");
999 	case PROC_FS:
1000 		argv[argc++] = "-Tf";
1001 		break;
1002 	case PROC_NET:
1003 		argv[argc++] = "-Tn";
1004 		break;
1005 	}
1006 
1007 	if (safe_mode)
1008 		argv[argc++] = "-S";
1009 
1010 	argv[argc++] = NULL;
1011 	execvp(argv0, (char *const *)argv);
1012 	err(1, "execvp(%s)", argv0);
1013 }
1014 
1015 int
1016 ui_send_net(int type, uint32_t peerid, const void *data,
1017     uint16_t datalen)
1018 {
1019 	return imsg_compose_event(iev_net, type, peerid, 0, -1, data,
1020 	    datalen);
1021 }
1022 
1023 int
1024 ui_send_fs(int type, uint32_t peerid, const void *data, uint16_t datalen)
1025 {
1026 	return imsg_compose_event(iev_fs, type, peerid, 0, -1, data,
1027 	    datalen);
1028 }
1029 
1030 static void __attribute__((noreturn))
1031 usage(int r)
1032 {
1033 	fprintf(stderr, "USAGE: %s [-ChnSv] [-c config] [url]\n",
1034 	    getprogname());
1035 	fprintf(stderr, "version: " PACKAGE " " VERSION "\n");
1036 	exit(r);
1037 }
1038 
1039 int
1040 main(int argc, char * const *argv)
1041 {
1042 	struct imsgev	 net_ibuf, fs_ibuf;
1043 	pid_t		 pid;
1044 	int		 pipe2net[2], pipe2fs[2];
1045 	int		 ch, configtest = 0, fail = 0;
1046 	int		 has_url = 0;
1047 	int		 proc = -1;
1048 	int		 sessionfd = -1;
1049 	int		 status;
1050 	char		 url[GEMINI_URL_LEN+1];
1051 	const char	*argv0;
1052 
1053 	argv0 = argv[0];
1054 
1055 	signal(SIGCHLD, SIG_IGN);
1056 	signal(SIGPIPE, SIG_IGN);
1057 
1058 	if (getenv("NO_COLOR") != NULL)
1059 		enable_colors = 0;
1060 
1061 	fs_init();
1062 
1063 	while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
1064 		switch (ch) {
1065 		case 'C':
1066 			exit(ui_print_colors());
1067 		case 'c':
1068 			fail = 1;
1069 			strlcpy(config_path, optarg, sizeof(config_path));
1070 			break;
1071 		case 'n':
1072 			configtest = 1;
1073 			break;
1074 		case 'h':
1075 			usage(0);
1076 		case 'S':
1077 			safe_mode = 1;
1078 			break;
1079 		case 'T':
1080 			switch (*optarg) {
1081 			case 'f':
1082 				proc = PROC_FS;
1083 				break;
1084 			case 'n':
1085 				proc = PROC_NET;
1086 				break;
1087 			default:
1088 				errx(1, "invalid process spec %c",
1089 				    *optarg);
1090 			}
1091 			break;
1092 		case 'v':
1093 			printf("%s %s\n", PACKAGE_NAME, PACKAGE_VERSION);
1094 			exit(0);
1095 			break;
1096 		default:
1097 			usage(1);
1098 		}
1099 	}
1100 
1101 	argc -= optind;
1102 	argv += optind;
1103 
1104 	if (proc != -1) {
1105 		if (argc > 0)
1106 			usage(1);
1107 		else if (proc == PROC_FS)
1108 			return fs_main();
1109 		else if (proc == PROC_NET)
1110 			return net_main();
1111 		else
1112 			usage(1);
1113 	}
1114 
1115 	if (argc != 0) {
1116 		has_url = 1;
1117 		humanify_url(argv[0], url, sizeof(url));
1118 	}
1119 
1120 	/* setup keys before reading the config */
1121 	TAILQ_INIT(&global_map.m);
1122 	global_map.unhandled_input = global_key_unbound;
1123 	TAILQ_INIT(&minibuffer_map.m);
1124 
1125 	config_init();
1126 	parseconfig(config_path, fail);
1127 	if (configtest) {
1128 		puts("config OK");
1129 		exit(0);
1130 	}
1131 
1132 	if (download_path == NULL &&
1133 	    (download_path = strdup("/tmp/")) == NULL)
1134 		errx(1, "strdup");
1135 
1136 	if (!safe_mode && (sessionfd = lock_session()) == -1)
1137 		errx(1, "can't lock session, is another instance of "
1138 		    "telescope already running?");
1139 
1140 	/* Start children. */
1141 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2fs) == -1)
1142 		err(1, "socketpair");
1143 	start_child(PROC_FS, argv0, pipe2fs[1]);
1144 	imsg_init(&fs_ibuf.ibuf, pipe2fs[0]);
1145 	iev_fs = &fs_ibuf;
1146 	iev_fs->handler = handle_dispatch_imsg;
1147 
1148 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2net) == -1)
1149 		err(1, "socketpair");
1150 	start_child(PROC_NET, argv0, pipe2net[1]);
1151 	imsg_init(&net_ibuf.ibuf, pipe2net[0]);
1152 	iev_net = &net_ibuf;
1153 	iev_net->handler = handle_dispatch_imsg;
1154 
1155 	setproctitle("ui");
1156 
1157 	/* initialize tofu & load certificates */
1158 	tofu_init(&certs, 5, offsetof(struct tofu_entry, domain));
1159 	load_certs(&certs);
1160 
1161 	event_init();
1162 
1163 	/* Setup event handler for the autosave */
1164 	autosave_init();
1165 
1166 	/* Setup event handlers for pipes to fs/net */
1167 	iev_fs->events = EV_READ;
1168 	event_set(&iev_fs->ev, iev_fs->ibuf.fd, iev_fs->events,
1169 	    iev_fs->handler, iev_fs);
1170 	event_add(&iev_fs->ev, NULL);
1171 
1172 	iev_net->events = EV_READ;
1173 	event_set(&iev_net->ev, iev_net->ibuf.fd, iev_net->events,
1174 	    iev_net->handler, iev_net);
1175 	event_add(&iev_net->ev, NULL);
1176 
1177 	if (ui_init()) {
1178 		load_last_session();
1179 		if (has_url || TAILQ_EMPTY(&tabshead))
1180 			new_tab(url, NULL, NULL);
1181 
1182 		sandbox_ui_process();
1183 		operating = 1;
1184 		ui_main_loop();
1185 		ui_end();
1186 	}
1187 
1188 	ui_send_fs(IMSG_QUIT, 0, NULL, 0);
1189 	ui_send_net(IMSG_QUIT, 0, NULL, 0);
1190 	imsg_flush(&iev_fs->ibuf);
1191 	imsg_flush(&iev_net->ibuf);
1192 
1193 	/* wait for children to terminate */
1194 	do {
1195 		pid = wait(&status);
1196 		if (pid == -1) {
1197 			if (errno != EINTR && errno != ECHILD)
1198 				err(1, "wait");
1199 		} else if (WIFSIGNALED(status))
1200 			warnx("child terminated; signal %d", WTERMSIG(status));
1201 	} while (pid != -1 || (pid == -1 && errno == EINTR));
1202 
1203 	if (!safe_mode && close(sessionfd) == -1)
1204 		err(1, "close(sessionfd = %d)", sessionfd);
1205 
1206 	return 0;
1207 }