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Date:: Sun Jan 2 09:12:59 2022 UTC
Message:: add --corours as an alias for --color Suggested by Florian, thanks!
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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 	{"colours",	no_argument,    NULL,   'C'},
41 	{"help",	no_argument,	NULL,	'h'},
42 	{"safe",	no_argument,	NULL,	'S'},
43 	{"version",	no_argument,	NULL,	'v'},
44 	{NULL,		0,		NULL,	0},
45 };
46 
47 static const char *opts = "Cc:hnST:v";
48 
49 static int	has_url;
50 static char	url[GEMINI_URL_LEN];
51 
52 /*
53  * Used to know when we're finished loading.
54  */
55 int			 operating;
56 
57 /*
58  * "Safe" (or "sandobox") mode.  If enabled, Telescope shouldn't write
59  * anything to the filesystem or execute external programs.
60  */
61 int			safe_mode;
62 
63 static struct imsgev	*iev_fs, *iev_net;
64 
65 struct tabshead		 tabshead = TAILQ_HEAD_INITIALIZER(tabshead);
66 struct proxylist	 proxies = TAILQ_HEAD_INITIALIZER(proxies);
67 
68 enum telescope_process {
69 	PROC_UI,
70 	PROC_FS,
71 	PROC_NET,
72 };
73 
74 #define CANNOT_FETCH		0
75 #define TOO_MUCH_REDIRECTS	1
76 #define MALFORMED_RESPONSE	2
77 #define UNKNOWN_TYPE_OR_CSET	3
78 #define UNKNOWN_PROTOCOL	4
79 
80 /* XXX: keep in sync with normalize_code */
81 const char *err_pages[70] = {
82 	[CANNOT_FETCH]		= "# Couldn't load the page\n",
83 	[TOO_MUCH_REDIRECTS]	= "# Too much redirects\n",
84 	[MALFORMED_RESPONSE]	= "# Got a malformed response\n",
85 	[UNKNOWN_TYPE_OR_CSET]	= "# Unsupported type or charset\n",
86 	[UNKNOWN_PROTOCOL]	= "# Unknown protocol\n",
87 
88 	[10] = "# Input required\n",
89 	[11] = "# Input required\n",
90 	[40] = "# Temporary failure\n",
91 	[41] = "# Server unavailable\n",
92 	[42] = "# CGI error\n",
93 	[43] = "# Proxy error\n",
94 	[44] = "# Slow down\n",
95 	[50] = "# Permanent failure\n",
96 	[51] = "# Not found\n",
97 	[52] = "# Gone\n",
98 	[53] = "# Proxy request refused\n",
99 	[59] = "# Bad request\n",
100 	[60] = "# Client certificate required\n",
101 	[61] = "# Certificate not authorised\n",
102 	[62] = "# Certificate not valid\n"
103 };
104 
105 static void		 die(void) __attribute__((__noreturn__));
106 static struct tab	*tab_by_id(uint32_t);
107 static void		 handle_imsg_err(struct imsg *, size_t);
108 static void		 handle_imsg_check_cert(struct imsg *, size_t);
109 static void		 handle_check_cert_user_choice(int, struct tab *);
110 static void		 handle_maybe_save_new_cert(int, struct tab *);
111 static void		 handle_imsg_got_code(struct imsg *, size_t);
112 static void		 handle_imsg_got_meta(struct imsg *, size_t);
113 static void		 handle_maybe_save_page(int, struct tab *);
114 static void		 handle_save_page_path(const char *, struct tab *);
115 static void		 handle_imsg_file_opened(struct imsg *, size_t);
116 static void		 handle_imsg_buf(struct imsg *, size_t);
117 static void		 handle_imsg_eof(struct imsg *, size_t);
118 static void		 handle_imsg_bookmark_ok(struct imsg *, size_t);
119 static void		 handle_imsg_save_cert_ok(struct imsg *, size_t);
120 static void		 handle_imsg_update_cert_ok(struct imsg *, size_t);
121 static void		 handle_imsg_session(struct imsg *, size_t);
122 static void		 handle_dispatch_imsg(int, short, void *);
123 static int		 load_about_url(struct tab *, const char *);
124 static int		 load_file_url(struct tab *, const char *);
125 static int		 load_finger_url(struct tab *, const char *);
126 static int		 load_gemini_url(struct tab *, const char *);
127 static int		 load_gopher_url(struct tab *, const char *);
128 static int		 load_via_proxy(struct tab *, const char *,
129 			     struct proxy *);
130 static int		 make_request(struct tab *, struct get_req *, int,
131 			     const char *);
132 static int		 make_fs_request(struct tab *, int, const char *);
133 static int		 do_load_url(struct tab *, const char *, const char *);
134 static pid_t		 start_child(enum telescope_process, const char *, int);
135 
136 static struct proto {
137 	const char	*schema;
138 	const char	*port;
139 	int		 (*loadfn)(struct tab *, const char *);
140 } protos[] = {
141 	{"about",	NULL,	load_about_url},
142 	{"file",	NULL,	load_file_url},
143 	{"finger",	"79",	load_finger_url},
144 	{"gemini",	"1965",	load_gemini_url},
145 	{"gopher",	"70",	load_gopher_url},
146 	{NULL, NULL, NULL},
147 };
148 
149 static imsg_handlerfn *handlers[] = {
150 	[IMSG_ERR] = handle_imsg_err,
151 	[IMSG_CHECK_CERT] = handle_imsg_check_cert,
152 	[IMSG_GOT_CODE] = handle_imsg_got_code,
153 	[IMSG_GOT_META] = handle_imsg_got_meta,
154 	[IMSG_BUF] = handle_imsg_buf,
155 	[IMSG_EOF] = handle_imsg_eof,
156 	[IMSG_BOOKMARK_OK] = handle_imsg_bookmark_ok,
157 	[IMSG_SAVE_CERT_OK] = handle_imsg_save_cert_ok,
158 	[IMSG_UPDATE_CERT_OK] = handle_imsg_update_cert_ok,
159 	[IMSG_FILE_OPENED] = handle_imsg_file_opened,
160 	[IMSG_SESSION_TAB] = handle_imsg_session,
161 	[IMSG_SESSION_END] = handle_imsg_session,
162 };
163 
164 static struct ohash	certs;
165 
166 static void __attribute__((__noreturn__))
167 die(void)
168 {
169 	abort(); 		/* TODO */
170 }
171 
172 static struct tab *
173 tab_by_id(uint32_t id)
174 {
175 	struct tab *t;
176 
177 	TAILQ_FOREACH(t, &tabshead, tabs) {
178 		if (t->id == id)
179 			return t;
180 	}
181 
182 	return NULL;
183 }
184 
185 static void
186 handle_imsg_err(struct imsg *imsg, size_t datalen)
187 {
188 	struct tab	*tab;
189 	char		*page;
190 
191 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
192 		return;
193 
194 	page = imsg->data;
195 	page[datalen-1] = '\0';
196 
197 	if (asprintf(&page, "# Error loading %s\n\n> %s\n",
198 	    tab->hist_cur->h, page) == -1)
199 		die();
200 	load_page_from_str(tab, page);
201 	free(page);
202 }
203 
204 static void
205 handle_imsg_check_cert(struct imsg *imsg, size_t datalen)
206 {
207 	const char		*hash, *host, *port;
208 	int			 tofu_res;
209 	struct tofu_entry	*e;
210 	struct tab		*tab;
211 
212 	hash = imsg->data;
213 	if (hash[datalen-1] != '\0')
214 		abort();
215 
216 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
217 		return;
218 
219 	if (tab->proxy != NULL) {
220 		host = tab->proxy->host;
221 		port = tab->proxy->port;
222 	} else {
223 		host = tab->uri.host;
224 		port = tab->uri.port;
225 	}
226 
227 	if ((e = tofu_lookup(&certs, host, port)) == NULL) {
228 		/* TODO: an update in libressl/libretls changed
229 		 * significantly.  Find a better approach at storing
230 		 * the certs! */
231 		if (datalen > sizeof(e->hash))
232 			abort();
233 
234 		tofu_res = 1;	/* trust on first use */
235 		if ((e = calloc(1, sizeof(*e))) == NULL)
236 			abort();
237 		strlcpy(e->domain, host, sizeof(e->domain));
238 		if (*port != '\0' && strcmp(port, "1965")) {
239 			strlcat(e->domain, ":", sizeof(e->domain));
240 			strlcat(e->domain, port, sizeof(e->domain));
241 		}
242 		strlcpy(e->hash, hash, sizeof(e->hash));
243 		tofu_add(&certs, e);
244 		ui_send_fs(IMSG_SAVE_CERT, tab->id, e, sizeof(*e));
245 	} else
246 		tofu_res = !strcmp(hash, e->hash);
247 
248 	if (tofu_res) {
249 		if (e->verified == -1)
250 			tab->trust = TS_TEMP_TRUSTED;
251 		else if (e->verified == 1)
252 			tab->trust = TS_VERIFIED;
253 		else
254 			tab->trust = TS_TRUSTED;
255 
256 		ui_send_net(IMSG_CERT_STATUS, imsg->hdr.peerid,
257 		    &tofu_res, sizeof(tofu_res));
258 	} else {
259 		tab->trust = TS_UNTRUSTED;
260 		load_page_from_str(tab, "# Certificate mismatch\n");
261 		if ((tab->cert = strdup(hash)) == NULL)
262 			die();
263 		ui_yornp("Certificate mismatch.  Proceed?",
264 		    handle_check_cert_user_choice, tab);
265 	}
266 }
267 
268 static void
269 handle_check_cert_user_choice(int accept, struct tab *tab)
270 {
271 	ui_send_net(IMSG_CERT_STATUS, tab->id, &accept,
272 	    sizeof(accept));
273 
274 	if (accept) {
275 		/*
276 		 * trust the certificate for this session only.  If
277 		 * the page results in a redirect while we're asking
278 		 * the user to save, we'll end up with an invalid
279 		 * tabid (one request == one tab id).  It also makes
280 		 * sense to save it for the current session if the
281 		 * user accepted it.
282 		 */
283 		tofu_temp_trust(&certs, tab->uri.host, tab->uri.port,
284 		    tab->cert);
285 
286 		if (!safe_mode)
287 			ui_yornp("Save the new certificate?",
288 			    handle_maybe_save_new_cert, tab);
289 		else
290 			message("Certificate temporarly trusted");
291 	} else {
292 		free(tab->cert);
293 		tab->cert = NULL;
294 	}
295 }
296 
297 static void
298 handle_maybe_save_new_cert(int accept, struct tab *tab)
299 {
300 	struct tofu_entry *e;
301 	const char *host, *port;
302 
303 	if (tab->proxy != NULL) {
304 		host = tab->proxy->host;
305 		port = tab->proxy->port;
306 	} else {
307 		host = tab->uri.host;
308 		port = tab->uri.port;
309 	}
310 
311 	if (!accept)
312 		goto end;
313 
314 	if ((e = calloc(1, sizeof(*e))) == NULL)
315 		die();
316 
317 	strlcpy(e->domain, host, sizeof(e->domain));
318 	if (*port != '\0' && strcmp(port, "1965")) {
319 		strlcat(e->domain, ":", sizeof(e->domain));
320 		strlcat(e->domain, port, sizeof(e->domain));
321 	}
322 	strlcpy(e->hash, tab->cert, sizeof(e->hash));
323 	ui_send_fs(IMSG_UPDATE_CERT, 0, e, sizeof(*e));
324 
325 	tofu_update(&certs, e);
326 
327 	tab->trust = TS_TRUSTED;
328 
329 end:
330 	free(tab->cert);
331 	tab->cert = NULL;
332 }
333 
334 static inline int
335 normalize_code(int n)
336 {
337 	if (n < 20) {
338 		if (n == 10 || n == 11)
339 			return n;
340 		return 10;
341 	} else if (n < 30) {
342 		return 20;
343 	} else if (n < 40) {
344 		if (n == 30 || n == 31)
345 			return n;
346 		return 30;
347 	} else if (n < 50) {
348 		if (n <= 44)
349 			return n;
350 		return 40;
351 	} else if (n < 60) {
352 		if (n <= 53 || n == 59)
353 			return n;
354 		return 50;
355 	} else if (n < 70) {
356 		if (n <= 62)
357 			return n;
358 		return 60;
359 	} else
360 		return MALFORMED_RESPONSE;
361 }
362 
363 static void
364 handle_imsg_got_code(struct imsg *imsg, size_t datalen)
365 {
366 	struct tab	*tab;
367 
368 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
369 		return;
370 
371 	if (sizeof(tab->code) != datalen)
372 		die();
373 
374 	memcpy(&tab->code, imsg->data, sizeof(tab->code));
375 	tab->code = normalize_code(tab->code);
376 	if (tab->code != 30 && tab->code != 31)
377 		tab->redirect_count = 0;
378 }
379 
380 static void
381 handle_imsg_got_meta(struct imsg *imsg, size_t datalen)
382 {
383 	struct tab	*tab;
384 	char		 buf[128];
385 
386 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
387 		return;
388 
389 	if (sizeof(tab->meta) <= datalen)
390 		die();
391 
392 	memcpy(tab->meta, imsg->data, datalen);
393 
394 	if (tab->code < 10) {	/* internal errors */
395 		load_page_from_str(tab, err_pages[tab->code]);
396 	} else if (tab->code < 20) {	/* 1x */
397 		load_page_from_str(tab, err_pages[tab->code]);
398 		ui_require_input(tab, tab->code == 11, PROTO_GEMINI);
399 	} else if (tab->code == 20) {
400 		if (setup_parser_for(tab)) {
401 			ui_send_net(IMSG_PROCEED, tab->id, NULL, 0);
402 		} else if (safe_mode) {
403 			load_page_from_str(tab,
404 			    err_pages[UNKNOWN_TYPE_OR_CSET]);
405 		} else {
406 			struct hist *h;
407 
408 			if ((h = hist_pop(&tab->hist)) != NULL)
409 				tab->hist_cur = h;
410 			snprintf(buf, sizeof(buf),
411 			    "Can't display \"%s\", save it?", tab->meta);
412 			ui_yornp(buf, handle_maybe_save_page, tab);
413 		}
414 	} else if (tab->code < 40) { /* 3x */
415 		tab->redirect_count++;
416 
417 		/* TODO: make customizable? */
418 		if (tab->redirect_count > 5) {
419 			load_page_from_str(tab,
420 			    err_pages[TOO_MUCH_REDIRECTS]);
421 		} else
422 			do_load_url(tab, tab->meta, NULL);
423 	} else { /* 4x, 5x & 6x */
424 		load_page_from_str(tab, err_pages[tab->code]);
425 	}
426 }
427 
428 static void
429 handle_maybe_save_page(int dosave, struct tab *tab)
430 {
431 	const char	*f;
432 	char		 input[PATH_MAX];
433 
434 	/* XXX: this print a message that is confusing  */
435 	ui_on_tab_loaded(tab);
436 
437 	if (!dosave) {
438 		stop_tab(tab);
439 		return;
440 	}
441 
442 	if ((f = strrchr(tab->uri.path, '/')) == NULL)
443 		f = "";
444 	else
445 		f++;
446 
447 	strlcpy(input, download_path, sizeof(input));
448 	strlcat(input, f, sizeof(input));
449 
450 	ui_read("Save to path", handle_save_page_path, tab, input);
451 }
452 
453 static void
454 handle_save_page_path(const char *path, struct tab *tab)
455 {
456 	if (path == NULL) {
457 		stop_tab(tab);
458 		return;
459 	}
460 
461 	ui_show_downloads_pane();
462 
463 	enqueue_download(tab->id, path);
464 	ui_send_fs(IMSG_FILE_OPEN, tab->id, path, strlen(path)+1);
465 
466 	/*
467 	 * Change this tab id, the old one is associated with the
468 	 * download now.
469 	 */
470 	tab->id = tab_new_id();
471 }
472 
473 static void
474 handle_imsg_file_opened(struct imsg *imsg, size_t datalen)
475 {
476 	struct download	*d;
477 	const char	*e;
478 
479 	/*
480 	 * There are no reason we shouldn't be able to find the
481 	 * required download.
482 	 */
483 	if ((d = download_by_id(imsg->hdr.peerid)) == NULL)
484 		die();
485 
486 	if (imsg->fd == -1) {
487 		e = imsg->data;
488 		if (e[datalen-1] != '\0')
489 			die();
490 		message("Can't open file %s: %s", d->path, e);
491 	} else {
492 		d->fd = imsg->fd;
493 		ui_send_net(IMSG_PROCEED, d->id, NULL, 0);
494 	}
495 }
496 
497 static void
498 handle_imsg_session(struct imsg *imsg, size_t datalen)
499 {
500 	static struct tab	*curr;
501 	struct session_tab	 st;
502 	struct tab		*tab;
503 	int			 first_time;
504 
505 	/*
506 	 * The fs process tried to send tabs after it has announced
507 	 * that he's done.  Something fishy is going on, better die.
508 	 */
509 	if (operating)
510 		die();
511 
512 	if (imsg->hdr.type == IMSG_SESSION_END) {
513 		if (datalen != sizeof(first_time))
514 			die();
515 		memcpy(&first_time, imsg->data, sizeof(first_time));
516 		if (first_time) {
517 			new_tab("about:new", NULL, NULL);
518 			curr = new_tab("about:help", NULL, NULL);
519 		}
520 
521 		operating = 1;
522 		if (curr != NULL)
523 			switch_to_tab(curr);
524 		if (has_url || TAILQ_EMPTY(&tabshead))
525 			new_tab(url, NULL, NULL);
526 		ui_main_loop();
527 		return;
528 	}
529 
530 	if (datalen != sizeof(st))
531 		die();
532 
533 	memcpy(&st, imsg->data, sizeof(st));
534 	if ((tab = new_tab(st.uri, NULL, NULL)) == NULL)
535 		die();
536 	strlcpy(tab->buffer.page.title, st.title,
537 	    sizeof(tab->buffer.page.title));
538 	if (st.flags & TAB_CURRENT)
539 		curr = tab;
540 }
541 
542 static void
543 handle_imsg_buf(struct imsg *imsg, size_t datalen)
544 {
545 	struct tab	*tab = NULL;
546 	struct download	*d = NULL;
547 
548 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL &&
549 	    (d = download_by_id(imsg->hdr.peerid)) == NULL)
550 		return;
551 
552 	if (tab != NULL) {
553 		if (!parser_parse(tab, imsg->data, datalen))
554 			die();
555 		ui_on_tab_refresh(tab);
556 	} else {
557 		d->bytes += datalen;
558 		write(d->fd, imsg->data, datalen);
559 		ui_on_download_refresh();
560 	}
561 }
562 
563 static void
564 handle_imsg_eof(struct imsg *imsg, size_t datalen)
565 {
566 	struct tab	*tab = NULL;
567 	struct download	*d = NULL;
568 
569 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL &&
570 	    (d = download_by_id(imsg->hdr.peerid)) == NULL)
571 		return;
572 
573 	if (tab != NULL) {
574 		if (!parser_free(tab))
575 			die();
576 		ui_on_tab_refresh(tab);
577 		ui_on_tab_loaded(tab);
578 	} else {
579 		close(d->fd);
580 		d->fd = -1;
581 		ui_on_download_refresh();
582 	}
583 }
584 
585 static void
586 handle_imsg_bookmark_ok(struct imsg *imsg, size_t datalen)
587 {
588 	int res;
589 
590 	if (datalen != sizeof(res))
591 		die();
592 
593 	memcpy(&res, imsg->data, sizeof(res));
594 	if (res == 0)
595 		message("Added to bookmarks!");
596 	else
597 		message("Failed to add to bookmarks: %s",
598 		    strerror(res));
599 }
600 
601 static void
602 handle_imsg_save_cert_ok(struct imsg *imsg, size_t datalen)
603 {
604 	int res;
605 
606 	if (datalen != sizeof(res))
607 		die();
608 	memcpy(&res, imsg->data, datalen);
609 	if (res != 0)
610 		message("Failed to save the cert for: %s",
611 		    strerror(res));
612 }
613 
614 static void
615 handle_imsg_update_cert_ok(struct imsg *imsg, size_t datalen)
616 {
617 	int res;
618 
619 	if (datalen != sizeof(res))
620 		die();
621 	memcpy(&res, imsg->data, datalen);
622 	if (!res)
623 		message("Failed to update the certificate");
624 }
625 
626 static void
627 handle_dispatch_imsg(int fd, short ev, void *d)
628 {
629 	struct imsgev	*iev = d;
630 
631 	if (dispatch_imsg(iev, ev, handlers, sizeof(handlers)) == -1)
632 		err(1, "connection closed");
633 }
634 
635 static int
636 load_about_url(struct tab *tab, const char *url)
637 {
638 	tab->trust = TS_UNKNOWN;
639 	parser_init(tab, gemtext_initparser);
640 	return make_fs_request(tab, IMSG_GET, url);
641 }
642 
643 static int
644 load_file_url(struct tab *tab, const char *url)
645 {
646 	tab->trust = TS_UNKNOWN;
647 	return make_fs_request(tab, IMSG_GET_FILE, tab->uri.path);
648 }
649 
650 static int
651 load_finger_url(struct tab *tab, const char *url)
652 {
653 	struct get_req	 req;
654 	size_t		 len;
655 	char		*at;
656 
657 	memset(&req, 0, sizeof(req));
658 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
659 
660 	/*
661 	 * Sometimes the finger url have the user as path component
662 	 * (e.g. finger://thelambdalab.xyz/plugd), sometimes as
663 	 * userinfo (e.g. finger://cobradile@finger.farm).
664 	 */
665 	if ((at = strchr(tab->uri.host, '@')) != NULL) {
666 		len = at - tab->uri.host;
667 		memcpy(req.req, tab->uri.host, len);
668 
669 		if (len >= sizeof(req.req))
670 			die();
671 		req.req[len] = '\0';
672 
673 		strlcpy(req.host, at+1, sizeof(req.host));
674 	} else {
675 		strlcpy(req.host, tab->uri.host, sizeof(req.host));
676 
677 		/* +1 to skip the initial `/' */
678 		strlcpy(req.req, tab->uri.path+1, sizeof(req.req));
679 	}
680 	strlcat(req.req, "\r\n", sizeof(req.req));
681 
682 	parser_init(tab, textplain_initparser);
683 	return make_request(tab, &req, PROTO_FINGER, NULL);
684 }
685 
686 static int
687 load_gemini_url(struct tab *tab, const char *url)
688 {
689 	struct get_req	 req;
690 
691 	memset(&req, 0, sizeof(req));
692 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
693 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
694 
695 	return make_request(tab, &req, PROTO_GEMINI, tab->hist_cur->h);
696 }
697 
698 static inline const char *
699 gopher_skip_selector(const char *path, int *ret_type)
700 {
701 	*ret_type = 0;
702 
703 	if (!strcmp(path, "/") || *path == '\0') {
704 		*ret_type = '1';
705 		return path;
706 	}
707 
708 	if (*path != '/')
709 		return path;
710 	path++;
711 
712 	switch (*ret_type = *path) {
713 	case '0':
714 	case '1':
715 	case '7':
716 		break;
717 
718 	default:
719 		*ret_type = 0;
720 		path -= 1;
721 		return path;
722 	}
723 
724 	return ++path;
725 }
726 
727 static int
728 load_gopher_url(struct tab *tab, const char *url)
729 {
730 	struct get_req	 req;
731 	int		 type;
732 	const char	*path;
733 
734 	memset(&req, 0, sizeof(req));
735 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
736 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
737 
738 	path = gopher_skip_selector(tab->uri.path, &type);
739 	switch (type) {
740 	case '0':
741 		parser_init(tab, textplain_initparser);
742 		break;
743 	case '1':
744 		parser_init(tab, gophermap_initparser);
745 		break;
746 	case '7':
747 		ui_require_input(tab, 0, PROTO_GOPHER);
748 		return load_page_from_str(tab, err_pages[10]);
749 	default:
750 		return load_page_from_str(tab, "Unknown gopher selector");
751 	}
752 
753 	strlcpy(req.req, path, sizeof(req.req));
754 	if (*tab->uri.query != '\0') {
755 		strlcat(req.req, "?", sizeof(req.req));
756 		strlcat(req.req, tab->uri.query, sizeof(req.req));
757 	}
758 	strlcat(req.req, "\r\n", sizeof(req.req));
759 
760 	return make_request(tab, &req, PROTO_GOPHER, NULL);
761 }
762 
763 static int
764 load_via_proxy(struct tab *tab, const char *url, struct proxy *p)
765 {
766 	struct get_req req;
767 
768 	memset(&req, 0, sizeof(req));
769 	strlcpy(req.host, p->host, sizeof(req.host));
770 	strlcpy(req.port, p->port, sizeof(req.port));
771 
772 	tab->proxy = p;
773 
774 	return make_request(tab, &req, p->proto, tab->hist_cur->h);
775 }
776 
777 static int
778 make_request(struct tab *tab, struct get_req *req, int proto, const char *r)
779 {
780 	stop_tab(tab);
781 	tab->id = tab_new_id();
782 	req->proto = proto;
783 
784 	if (r != NULL) {
785 		strlcpy(req->req, r, sizeof(req->req));
786 		strlcat(req->req, "\r\n", sizeof(req->req));
787 	}
788 
789 	ui_send_net(IMSG_GET_RAW, tab->id, req, sizeof(*req));
790 
791 	/*
792 	 * So the various load_*_url can `return make_request` and
793 	 * do_load_url is happy.
794 	 */
795 	return 1;
796 }
797 
798 static int
799 make_fs_request(struct tab *tab, int type, const char *r)
800 {
801 	stop_tab(tab);
802 	tab->id = tab_new_id();
803 
804 	ui_send_fs(type, tab->id, r, strlen(r)+1);
805 
806 	/*
807 	 * So load_{about,file}_url can `return make_fs_request` and
808 	 * do_load_url is happy.
809 	 */
810 	return 1;
811 }
812 
813 void
814 gopher_send_search_req(struct tab *tab, const char *text)
815 {
816 	struct get_req	req;
817 
818 	start_loading_anim(tab);
819 
820 	memset(&req, 0, sizeof(req));
821 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
822 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
823 
824 	/* +2 to skip /7 */
825 	strlcpy(req.req, tab->uri.path+2, sizeof(req.req));
826 	if (*tab->uri.query != '\0') {
827 		strlcat(req.req, "?", sizeof(req.req));
828 		strlcat(req.req, tab->uri.query, sizeof(req.req));
829 	}
830 
831 	strlcat(req.req, "\t", sizeof(req.req));
832 	strlcat(req.req, text, sizeof(req.req));
833 	strlcat(req.req, "\r\n", sizeof(req.req));
834 
835 	erase_buffer(&tab->buffer);
836 	parser_init(tab, gophermap_initparser);
837 
838 	make_request(tab, &req, PROTO_GOPHER, NULL);
839 }
840 
841 /*
842  * Effectively load the given url in the given tab.  Return 1 when
843  * loading the page asynchronously, and thus when an erase_buffer can
844  * be done right after this function return, or 0 when loading the
845  * page synchronously.
846  */
847 static int
848 do_load_url(struct tab *tab, const char *url, const char *base)
849 {
850 	struct phos_uri	 uri;
851 	struct proto	*p;
852 	struct proxy	*proxy;
853 	char		*t;
854 
855 	tab->proxy = NULL;
856 
857 	tab->trust = TS_UNKNOWN;
858 
859 	if (base == NULL)
860 		memcpy(&uri, &tab->uri, sizeof(tab->uri));
861 	else
862 		phos_parse_absolute_uri(base, &uri);
863 
864 	if (!phos_resolve_uri_from_str(&uri, url, &tab->uri)) {
865 		if (asprintf(&t, "#error loading %s\n>%s\n",
866 		    url, "Can't parse the URI") == -1)
867 			die();
868 		strlcpy(tab->hist_cur->h, url, sizeof(tab->hist_cur->h));
869 		load_page_from_str(tab, t);
870 		free(t);
871 		return 0;
872 	}
873 
874 	phos_serialize_uri(&tab->uri, tab->hist_cur->h,
875 	    sizeof(tab->hist_cur->h));
876 
877 	for (p = protos; p->schema != NULL; ++p) {
878 		if (!strcmp(tab->uri.scheme, p->schema)) {
879 			/* patch the port */
880 			if (*tab->uri.port == '\0' && p->port != NULL)
881 				strlcpy(tab->uri.port, p->port,
882 				    sizeof(tab->uri.port));
883 
884 			return p->loadfn(tab, url);
885 		}
886 	}
887 
888 	TAILQ_FOREACH(proxy, &proxies, proxies) {
889 		if (!strcmp(tab->uri.scheme, proxy->match_proto))
890 			return load_via_proxy(tab, url, proxy);
891 	}
892 
893 	return load_page_from_str(tab, err_pages[UNKNOWN_PROTOCOL]);
894 }
895 
896 /*
897  * Load url in tab.  If tab is marked as lazy, only prepare the url
898  * but don't load it.  If tab is lazy and a url was already prepared,
899  * do load it!
900  */
901 void
902 load_url(struct tab *tab, const char *url, const char *base, int nohist)
903 {
904 	int lazy;
905 
906 	lazy = tab->flags & TAB_LAZY;
907 
908 	if (lazy && tab->hist_cur != NULL) {
909 		lazy = 0;
910 		tab->flags &= ~TAB_LAZY;
911 	}
912 
913 	/* can't have both nohist and lazy at the same time. */
914 	if (nohist && lazy)
915 		nohist = 0;
916 
917 	if (!nohist && (!lazy || tab->hist_cur == NULL)) {
918 		if (tab->hist_cur != NULL)
919 			hist_clear_forward(&tab->hist,
920 			    TAILQ_NEXT(tab->hist_cur, entries));
921 
922 		if ((tab->hist_cur = calloc(1, sizeof(*tab->hist_cur)))
923 		    == NULL) {
924 			event_loopbreak();
925 			return;
926 		}
927 
928 		strlcpy(tab->buffer.page.title, url,
929 		    sizeof(tab->buffer.page.title));
930 		hist_push(&tab->hist, tab->hist_cur);
931 
932 		if (lazy)
933 			strlcpy(tab->hist_cur->h, url,
934 			    sizeof(tab->hist_cur->h));
935 	}
936 
937 	if (!lazy)
938 		do_load_url(tab, url, base);
939 }
940 
941 void
942 load_url_in_tab(struct tab *tab, const char *url, const char *base, int nohist)
943 {
944 	if (!operating) {
945 		load_url(tab, url, base, nohist);
946 		return;
947 	}
948 
949 	autosave_hook();
950 
951 	message("Loading %s...", url);
952 	start_loading_anim(tab);
953 	load_url(tab, url, base, nohist);
954 }
955 
956 int
957 load_previous_page(struct tab *tab)
958 {
959 	struct hist	*h;
960 
961 	if ((h = TAILQ_PREV(tab->hist_cur, mhisthead, entries)) == NULL)
962 		return 0;
963 	tab->hist_cur = h;
964 	do_load_url(tab, h->h, NULL);
965 	return 1;
966 }
967 
968 int
969 load_next_page(struct tab *tab)
970 {
971 	struct hist	*h;
972 
973 	if ((h = TAILQ_NEXT(tab->hist_cur, entries)) == NULL)
974 		return 0;
975 	tab->hist_cur = h;
976 	do_load_url(tab, h->h, NULL);
977 	return 1;
978 }
979 
980 void
981 add_to_bookmarks(const char *str)
982 {
983 	ui_send_fs(IMSG_BOOKMARK_PAGE, 0,
984 	    str, strlen(str)+1);
985 }
986 
987 /*
988  * Given a user-entered URL, apply some heuristics to use it:
989  *
990  * - if it's a proper url use it
991  * - if it starts with a `./' or a `/' assume its a file:// url
992  * - assume it's a gemini:// url
993  *
994  * `ret' (of which len is the size) will be filled with the resulting
995  * url.
996  */
997 void
998 humanify_url(const char *raw, char *ret, size_t len)
999 {
1000 	struct phos_uri	uri;
1001 	char		buf[PATH_MAX];
1002 
1003 	if (phos_parse_absolute_uri(raw, &uri)) {
1004 		strlcpy(ret, raw, len);
1005 		return;
1006 	}
1007 
1008 	if (has_prefix(raw, "./")) {
1009 		strlcpy(ret, "file://", len);
1010 		getcwd(buf, sizeof(buf));
1011 		strlcat(ret, buf, len);
1012 		strlcat(ret, "/", len);
1013 		strlcat(ret, raw+2, len);
1014 		return;
1015 	}
1016 
1017 	if (*raw == '/') {
1018 		strlcpy(ret, "file://", len);
1019 		strlcat(ret, raw, len);
1020 		return;
1021 	}
1022 
1023 	strlcpy(ret, "gemini://", len);
1024 	strlcat(ret, raw, len);
1025 }
1026 
1027 static pid_t
1028 start_child(enum telescope_process p, const char *argv0, int fd)
1029 {
1030 	const char	*argv[5];
1031 	int		 argc = 0;
1032 	pid_t		 pid;
1033 
1034 	switch (pid = fork()) {
1035 	case -1:
1036 		die();
1037 	case 0:
1038 		break;
1039 	default:
1040 		close(fd);
1041 		return pid;
1042 	}
1043 
1044 	if (dup2(fd, 3) == -1)
1045 		err(1, "cannot setup imsg fd");
1046 
1047 	argv[argc++] = argv0;
1048 	switch (p) {
1049 	case PROC_UI:
1050 		errx(1, "Can't start ui process");
1051 	case PROC_FS:
1052 		argv[argc++] = "-Tf";
1053 		break;
1054 	case PROC_NET:
1055 		argv[argc++] = "-Tn";
1056 		break;
1057 	}
1058 
1059 	if (safe_mode)
1060 		argv[argc++] = "-S";
1061 
1062 	argv[argc++] = NULL;
1063 	execvp(argv0, (char *const *)argv);
1064 	err(1, "execvp(%s)", argv0);
1065 }
1066 
1067 int
1068 ui_send_net(int type, uint32_t peerid, const void *data,
1069     uint16_t datalen)
1070 {
1071 	return imsg_compose_event(iev_net, type, peerid, 0, -1, data,
1072 	    datalen);
1073 }
1074 
1075 int
1076 ui_send_fs(int type, uint32_t peerid, const void *data, uint16_t datalen)
1077 {
1078 	return imsg_compose_event(iev_fs, type, peerid, 0, -1, data,
1079 	    datalen);
1080 }
1081 
1082 static void __attribute__((noreturn))
1083 usage(int r)
1084 {
1085 	fprintf(stderr, "USAGE: %s [-ChnSv] [-c config] [url]\n",
1086 	    getprogname());
1087 	fprintf(stderr, "version: " PACKAGE " " VERSION "\n");
1088 	exit(r);
1089 }
1090 
1091 int
1092 main(int argc, char * const *argv)
1093 {
1094 	struct imsgev	 net_ibuf, fs_ibuf;
1095 	pid_t		 pid;
1096 	int		 pipe2net[2], pipe2fs[2];
1097 	int		 ch, configtest = 0, fail = 0;
1098 	int		 proc = -1;
1099 	int		 sessionfd = -1;
1100 	int		 status;
1101 	const char	*argv0;
1102 
1103 	argv0 = argv[0];
1104 
1105 	signal(SIGCHLD, SIG_IGN);
1106 	signal(SIGPIPE, SIG_IGN);
1107 
1108 	if (getenv("NO_COLOR") != NULL)
1109 		enable_colors = 0;
1110 
1111 	fs_init();
1112 
1113 	while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
1114 		switch (ch) {
1115 		case 'C':
1116 			exit(ui_print_colors());
1117 		case 'c':
1118 			fail = 1;
1119 			strlcpy(config_path, optarg, sizeof(config_path));
1120 			break;
1121 		case 'n':
1122 			configtest = 1;
1123 			break;
1124 		case 'h':
1125 			usage(0);
1126 		case 'S':
1127 			safe_mode = 1;
1128 			break;
1129 		case 'T':
1130 			switch (*optarg) {
1131 			case 'f':
1132 				proc = PROC_FS;
1133 				break;
1134 			case 'n':
1135 				proc = PROC_NET;
1136 				break;
1137 			default:
1138 				errx(1, "invalid process spec %c",
1139 				    *optarg);
1140 			}
1141 			break;
1142 		case 'v':
1143 			printf("%s %s\n", PACKAGE_NAME, PACKAGE_VERSION);
1144 			exit(0);
1145 			break;
1146 		default:
1147 			usage(1);
1148 		}
1149 	}
1150 
1151 	argc -= optind;
1152 	argv += optind;
1153 
1154 	if (proc != -1) {
1155 		if (argc > 0)
1156 			usage(1);
1157 		else if (proc == PROC_FS)
1158 			return fs_main();
1159 		else if (proc == PROC_NET)
1160 			return net_main();
1161 		else
1162 			usage(1);
1163 	}
1164 
1165 	if (argc != 0) {
1166 		has_url = 1;
1167 		humanify_url(argv[0], url, sizeof(url));
1168 	}
1169 
1170 	/* setup keys before reading the config */
1171 	TAILQ_INIT(&global_map.m);
1172 	global_map.unhandled_input = global_key_unbound;
1173 	TAILQ_INIT(&minibuffer_map.m);
1174 
1175 	config_init();
1176 	parseconfig(config_path, fail);
1177 	if (configtest) {
1178 		puts("config OK");
1179 		exit(0);
1180 	}
1181 
1182 	if (download_path == NULL &&
1183 	    (download_path = strdup("/tmp/")) == NULL)
1184 		errx(1, "strdup");
1185 
1186 	if (!safe_mode && (sessionfd = lock_session()) == -1)
1187 		errx(1, "can't lock session, is another instance of "
1188 		    "telescope already running?");
1189 
1190 	/* Start children. */
1191 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2fs) == -1)
1192 		err(1, "socketpair");
1193 	start_child(PROC_FS, argv0, pipe2fs[1]);
1194 	imsg_init(&fs_ibuf.ibuf, pipe2fs[0]);
1195 	iev_fs = &fs_ibuf;
1196 	iev_fs->handler = handle_dispatch_imsg;
1197 
1198 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2net) == -1)
1199 		err(1, "socketpair");
1200 	start_child(PROC_NET, argv0, pipe2net[1]);
1201 	imsg_init(&net_ibuf.ibuf, pipe2net[0]);
1202 	iev_net = &net_ibuf;
1203 	iev_net->handler = handle_dispatch_imsg;
1204 
1205 	setproctitle("ui");
1206 
1207 	/* initialize tofu & load certificates */
1208 	tofu_init(&certs, 5, offsetof(struct tofu_entry, domain));
1209 	load_certs(&certs);
1210 
1211 	event_init();
1212 
1213 	/* Setup event handler for the autosave */
1214 	autosave_init();
1215 
1216 	/* Setup event handlers for pipes to fs/net */
1217 	iev_fs->events = EV_READ;
1218 	event_set(&iev_fs->ev, iev_fs->ibuf.fd, iev_fs->events,
1219 	    iev_fs->handler, iev_fs);
1220 	event_add(&iev_fs->ev, NULL);
1221 
1222 	iev_net->events = EV_READ;
1223 	event_set(&iev_net->ev, iev_net->ibuf.fd, iev_net->events,
1224 	    iev_net->handler, iev_net);
1225 	event_add(&iev_net->ev, NULL);
1226 
1227 	if (ui_init()) {
1228 		sandbox_ui_process();
1229 		event_dispatch();
1230 		ui_end();
1231 	}
1232 
1233 	ui_send_fs(IMSG_QUIT, 0, NULL, 0);
1234 	ui_send_net(IMSG_QUIT, 0, NULL, 0);
1235 	imsg_flush(&iev_fs->ibuf);
1236 	imsg_flush(&iev_net->ibuf);
1237 
1238 	/* wait for children to terminate */
1239 	do {
1240 		pid = wait(&status);
1241 		if (pid == -1) {
1242 			if (errno != EINTR && errno != ECHILD)
1243 				err(1, "wait");
1244 		} else if (WIFSIGNALED(status))
1245 			warnx("child terminated; signal %d", WTERMSIG(status));
1246 	} while (pid != -1 || (pid == -1 && errno == EINTR));
1247 
1248 	if (!safe_mode && close(sessionfd) == -1)
1249 		err(1, "close(sessionfd = %d)", sessionfd);
1250 
1251 	return 0;
1252 }