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