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Date:: Sun Jul 18 09:08:45 2021 UTC
Message:: initialize curr
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1 #include <sys/socket.h>
2 
3 #include <errno.h>
4 #include <getopt.h>
5 #include <limits.h>
6 #include <signal.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <unistd.h>
11 
12 #include "defaults.h"
13 #include "pages.h"
14 #include "parser.h"
15 #include "telescope.h"
16 #include "ui.h"
17 
18 static struct option longopts[] = {
19 	{"colors",	no_argument,	NULL,	'c'},
20 	{"help",	no_argument,	NULL,	'h'},
21 	{"version",	no_argument,	NULL,	'v'},
22 	{NULL,		0,		NULL,	0},
23 };
24 
25 static const char *opts = "Cc:hnT:v";
26 
27 static struct imsgev	*iev_fs, *iev_net;
28 
29 struct tabshead		 tabshead = TAILQ_HEAD_INITIALIZER(tabshead);
30 struct proxylist	 proxies = TAILQ_HEAD_INITIALIZER(proxies);
31 
32 enum telescope_process {
33 	PROC_UI,
34 	PROC_FS,
35 	PROC_NET,
36 };
37 
38 /* the first is also the fallback one */
39 static struct proto protos[] = {
40 	{ "gemini",	load_gemini_url },
41 	{ "about",	load_about_url },
42 	{ NULL, NULL },
43 };
44 
45 
46 #define CANNOT_FETCH		0
47 #define TOO_MUCH_REDIRECTS	1
48 #define MALFORMED_RESPONSE	2
49 #define UNKNOWN_TYPE_OR_CSET	3
50 #define UNKNOWN_PROTOCOL	4
51 
52 /* XXX: keep in sync with telescope.c:/^normalize_code/ */
53 const char *err_pages[70] = {
54 	[CANNOT_FETCH]		= "# Couldn't load the page\n",
55 	[TOO_MUCH_REDIRECTS]	= "# Too much redirects\n",
56 	[MALFORMED_RESPONSE]	= "# Got a malformed response\n",
57 	[UNKNOWN_TYPE_OR_CSET]	= "# Unsupported type or charset\n",
58 	[UNKNOWN_PROTOCOL]	= "# Unknown protocol\n",
59 
60 	[10] = "# Input required\n",
61 	[11] = "# Input required\n",
62 	[40] = "# Temporary failure\n",
63 	[41] = "# Server unavailable\n",
64 	[42] = "# CGI error\n",
65 	[43] = "# Proxy error\n",
66 	[44] = "# Slow down\n",
67 	[50] = "# Permanent failure\n",
68 	[51] = "# Not found\n",
69 	[52] = "# Gone\n",
70 	[53] = "# Proxy request refused\n",
71 	[59] = "# Bad request\n",
72 	[60] = "# Client certificate required\n",
73 	[61] = "# Certificate not authorised\n",
74 	[62] = "# Certificate not valid\n"
75 };
76 
77 static void		 die(void) __attribute__((__noreturn__));
78 static struct tab	*tab_by_id(uint32_t);
79 static void		 handle_imsg_err(struct imsg*, size_t);
80 static void		 handle_imsg_check_cert(struct imsg*, size_t);
81 static void		 handle_check_cert_user_choice(int, struct tab *);
82 static void		 handle_maybe_save_new_cert(int, struct tab *);
83 static void		 handle_imsg_got_code(struct imsg*, size_t);
84 static void		 handle_imsg_got_meta(struct imsg*, size_t);
85 static void		 handle_maybe_save_page(int, struct tab *);
86 static void		 handle_save_page_path(const char *, struct tab *);
87 static void		 handle_imsg_file_opened(struct imsg*, size_t);
88 static void		 handle_imsg_buf(struct imsg*, size_t);
89 static void		 handle_imsg_eof(struct imsg*, size_t);
90 static void		 handle_imsg_bookmark_ok(struct imsg*, size_t);
91 static void		 handle_imsg_save_cert_ok(struct imsg*, size_t);
92 static void		 handle_imsg_update_cert_ok(struct imsg *, size_t);
93 static void		 handle_dispatch_imsg(int, short, void*);
94 static void		 load_page_from_str(struct tab*, const char*);
95 static int		 do_load_url(struct tab*, const char*);
96 static void		 parse_session_line(char *, const char **, uint32_t *);
97 static void		 load_last_session(void);
98 static pid_t		 start_child(enum telescope_process, const char *, int);
99 static int		 ui_send_net(int, uint32_t, const void *, uint16_t);
100 static int		 ui_send_fs(int, uint32_t, const void *, uint16_t);
101 
102 static imsg_handlerfn *handlers[] = {
103 	[IMSG_ERR] = handle_imsg_err,
104 	[IMSG_CHECK_CERT] = handle_imsg_check_cert,
105 	[IMSG_GOT_CODE] = handle_imsg_got_code,
106 	[IMSG_GOT_META] = handle_imsg_got_meta,
107 	[IMSG_BUF] = handle_imsg_buf,
108 	[IMSG_EOF] = handle_imsg_eof,
109 	[IMSG_BOOKMARK_OK] = handle_imsg_bookmark_ok,
110 	[IMSG_SAVE_CERT_OK] = handle_imsg_save_cert_ok,
111 	[IMSG_UPDATE_CERT_OK] = handle_imsg_update_cert_ok,
112 	[IMSG_FILE_OPENED] = handle_imsg_file_opened,
113 };
114 
115 static struct ohash	certs;
116 
117 static void __attribute__((__noreturn__))
118 die(void)
119 {
120 	abort(); 		/* TODO */
121 }
122 
123 static struct tab *
124 tab_by_id(uint32_t id)
125 {
126 	struct tab *t;
127 
128 	TAILQ_FOREACH(t, &tabshead, tabs) {
129 		if (t->id == id)
130 			return t;
131 	}
132 
133 	die();
134 }
135 
136 static void
137 handle_imsg_err(struct imsg *imsg, size_t datalen)
138 {
139 	struct tab	*tab;
140 	char		*page;
141 
142 	tab = tab_by_id(imsg->hdr.peerid);
143 
144 	page = imsg->data;
145 	page[datalen-1] = '\0';
146 
147 	if (asprintf(&page, "# Error loading %s\n\n> %s\n",
148 	    tab->hist_cur->h, page) == -1)
149 		die();
150 	load_page_from_str(tab, page);
151 	free(page);
152 }
153 
154 static void
155 handle_imsg_check_cert(struct imsg *imsg, size_t datalen)
156 {
157 	const char		*hash, *host, *port;
158 	int			 tofu_res;
159 	struct tofu_entry	*e;
160 	struct tab		*tab;
161 
162 	hash = imsg->data;
163 	if (hash[datalen-1] != '\0')
164 		abort();
165 
166 	tab = tab_by_id(imsg->hdr.peerid);
167 
168 	if (tab->proxy != NULL) {
169 		host = tab->proxy->host;
170 		port = tab->proxy->port;
171 	} else {
172 		host = tab->uri.host;
173 		port = tab->uri.port;
174 	}
175 
176 	if ((e = tofu_lookup(&certs, host, port)) == NULL) {
177 		/* TODO: an update in libressl/libretls changed
178 		 * significantly.  Find a better approach at storing
179 		 * the certs! */
180 		if (datalen > sizeof(e->hash))
181 			abort();
182 
183 		tofu_res = 1;	/* trust on first use */
184 		if ((e = calloc(1, sizeof(*e))) == NULL)
185 			abort();
186 		strlcpy(e->domain, host, sizeof(e->domain));
187 		if (*port != '\0' && strcmp(port, "1965")) {
188 			strlcat(e->domain, ":", sizeof(e->domain));
189 			strlcat(e->domain, port, sizeof(e->domain));
190 		}
191 		strlcpy(e->hash, hash, sizeof(e->hash));
192 		tofu_add(&certs, e);
193 		ui_send_fs(IMSG_SAVE_CERT, tab->id, e, sizeof(*e));
194 	} else
195 		tofu_res = !strcmp(hash, e->hash);
196 
197 	if (tofu_res) {
198 		if (e->verified == -1)
199 			tab->trust = TS_TEMP_TRUSTED;
200 		else if (e->verified == 1)
201 			tab->trust = TS_VERIFIED;
202 		else
203 			tab->trust = TS_TRUSTED;
204 
205 		ui_send_net(IMSG_CERT_STATUS, imsg->hdr.peerid,
206 		    &tofu_res, sizeof(tofu_res));
207 	} else {
208 		tab->trust = TS_UNTRUSTED;
209 		load_page_from_str(tab, "# Certificate mismatch\n");
210 		if ((tab->cert = strdup(hash)) == NULL)
211 			die();
212 		ui_yornp("Certificate mismatch.  Proceed?",
213 		    handle_check_cert_user_choice, tab);
214 	}
215 }
216 
217 static void
218 handle_check_cert_user_choice(int accept, struct tab *tab)
219 {
220 	ui_send_net(IMSG_CERT_STATUS, tab->id, &accept,
221 	    sizeof(accept));
222 
223 	if (accept) {
224 		/*
225 		 * trust the certificate for this session only.  If
226 		 * the page results in a redirect while we're asking
227 		 * the user to save, we'll end up with an invalid
228 		 * tabid (one request == one tab id) and crash.  It
229 		 * also makes sense to save it for the current session
230 		 * if the user accepted it.
231 		 */
232 		tofu_temp_trust(&certs, tab->uri.host, tab->uri.port, tab->cert);
233 
234 		ui_yornp("Save the new certificate?",
235 		    handle_maybe_save_new_cert, tab);
236 	} else {
237 		free(tab->cert);
238 		tab->cert = NULL;
239 	}
240 }
241 
242 static void
243 handle_maybe_save_new_cert(int accept, struct tab *tab)
244 {
245 	struct tofu_entry *e;
246 	const char *host, *port;
247 
248 	if (tab->proxy != NULL) {
249 		host = tab->proxy->host;
250 		port = tab->proxy->port;
251 	} else {
252 		host = tab->uri.host;
253 		port = tab->uri.port;
254 	}
255 
256 	if (!accept)
257 		goto end;
258 
259 	if ((e = calloc(1, sizeof(*e))) == NULL)
260 		die();
261 
262 	strlcpy(e->domain, host, sizeof(e->domain));
263 	if (*port != '\0' && strcmp(port, "1965")) {
264 		strlcat(e->domain, ":", sizeof(e->domain));
265 		strlcat(e->domain, port, sizeof(e->domain));
266 	}
267 	strlcpy(e->hash, tab->cert, sizeof(e->hash));
268 	ui_send_fs(IMSG_UPDATE_CERT, 0, e, sizeof(*e));
269 
270 	tofu_update(&certs, e);
271 
272 	tab->trust = TS_TRUSTED;
273 
274 end:
275 	free(tab->cert);
276 	tab->cert = NULL;
277 }
278 
279 static inline int
280 normalize_code(int n)
281 {
282 	if (n < 20) {
283 		if (n == 10 || n == 11)
284 			return n;
285 		return 10;
286 	} else if (n < 30) {
287 		return 20;
288 	} else if (n < 40) {
289 		if (n == 30 || n == 31)
290 			return n;
291 		return 30;
292 	} else if (n < 50) {
293 		if (n <= 44)
294 			return n;
295 		return 40;
296 	} else if (n < 60) {
297 		if (n <= 53 || n == 59)
298 			return n;
299 		return 50;
300 	} else if (n < 70) {
301 		if (n <= 62)
302 			return n;
303 		return 60;
304 	} else
305 		return MALFORMED_RESPONSE;
306 }
307 
308 static void
309 handle_imsg_got_code(struct imsg *imsg, size_t datalen)
310 {
311 	struct tab	*tab;
312 
313 	tab = tab_by_id(imsg->hdr.peerid);
314 
315 	if (sizeof(tab->code) != datalen)
316 		die();
317 
318 	memcpy(&tab->code, imsg->data, sizeof(tab->code));
319 	tab->code = normalize_code(tab->code);
320 	if (tab->code != 30 && tab->code != 31)
321 		tab->redirect_count = 0;
322 }
323 
324 static void
325 handle_imsg_got_meta(struct imsg *imsg, size_t datalen)
326 {
327 	struct tab	*tab;
328 
329 	tab = tab_by_id(imsg->hdr.peerid);
330 
331 	if (sizeof(tab->meta) <= datalen)
332 		die();
333 
334 	memcpy(tab->meta, imsg->data, datalen);
335 
336 	if (tab->code < 10) {	/* internal errors */
337 		load_page_from_str(tab, err_pages[tab->code]);
338 	} else if (tab->code < 20) {	/* 1x */
339 		load_page_from_str(tab, err_pages[tab->code]);
340 		ui_require_input(tab, tab->code == 11);
341 	} else if (tab->code == 20) {
342 		if (setup_parser_for(tab)) {
343 			ui_send_net(IMSG_PROCEED, tab->id, NULL, 0);
344 		} else {
345 			load_page_from_str(tab, err_pages[UNKNOWN_TYPE_OR_CSET]);
346 			ui_yornp("Can't display page, wanna save?",
347 			    handle_maybe_save_page, tab);
348 		}
349 	} else if (tab->code < 40) { /* 3x */
350 		tab->redirect_count++;
351 
352 		/* TODO: make customizable? */
353 		if (tab->redirect_count > 5) {
354 			load_page_from_str(tab,
355 			    err_pages[TOO_MUCH_REDIRECTS]);
356 		} else
357 			do_load_url(tab, tab->meta);
358 	} else { /* 4x, 5x & 6x */
359 		load_page_from_str(tab, err_pages[tab->code]);
360 	}
361 }
362 
363 static void
364 handle_maybe_save_page(int dosave, struct tab *tab)
365 {
366 	if (dosave)
367 		ui_read("Save to path", handle_save_page_path, tab);
368 	else
369 		stop_tab(tab);
370 }
371 
372 static void
373 handle_save_page_path(const char *path, struct tab *tab)
374 {
375 	if (path == NULL) {
376 		stop_tab(tab);
377 		return;
378 	}
379 
380 	tab->path = strdup(path);
381 
382 	ui_send_fs(IMSG_FILE_OPEN, tab->id, path, strlen(path)+1);
383 }
384 
385 static void
386 handle_imsg_file_opened(struct imsg *imsg, size_t datalen)
387 {
388 	struct tab	*tab;
389 	char		*page;
390 	const char	*e;
391 	int		 l;
392 
393 	tab = tab_by_id(imsg->hdr.peerid);
394 
395 	if (imsg->fd == -1) {
396 		stop_tab(tab);
397 
398 		e = imsg->data;
399 		if (e[datalen-1] != '\0')
400 			die();
401 		l = asprintf(&page, "# Can't open file\n\n> %s: %s\n",
402 		    tab->path, e);
403 		if (l == -1)
404 			die();
405 		load_page_from_str(tab, page);
406 		free(page);
407 	} else {
408 		tab->fd = imsg->fd;
409 		ui_send_net(IMSG_PROCEED, tab->id, NULL, 0);
410 	}
411 }
412 
413 static void
414 handle_imsg_buf(struct imsg *imsg, size_t datalen)
415 {
416 	struct tab	*tab;
417 	int		 l;
418 	char		*page, buf[FMT_SCALED_STRSIZE] = {0};
419 
420 	tab = tab_by_id(imsg->hdr.peerid);
421 
422 	tab->bytes += datalen;
423 	if (tab->fd == -1) {
424 		if (!tab->buffer.page.parse(&tab->buffer.page,
425 		    imsg->data, datalen))
426 			die();
427 	} else {
428 		write(tab->fd, imsg->data, datalen);
429 		fmt_scaled(tab->bytes, buf);
430 		l = asprintf(&page, "Saving to \"%s\"... (%s)\n",
431 		    tab->path,
432 		    buf);
433 		if (l == -1)
434 			die();
435 		load_page_from_str(tab, page);
436 		free(page);
437 	}
438 
439 	ui_on_tab_refresh(tab);
440 }
441 
442 static void
443 handle_imsg_eof(struct imsg *imsg, size_t datalen)
444 {
445 	struct tab	*tab;
446 	int		 l;
447 	char		*page, buf[FMT_SCALED_STRSIZE] = {0};
448 
449 	tab = tab_by_id(imsg->hdr.peerid);
450 
451 	if (tab->fd == -1) {
452 		if (!tab->buffer.page.free(&tab->buffer.page))
453 			die();
454 	} else {
455 		fmt_scaled(tab->bytes, buf);
456 		l = asprintf(&page, "Saved to \"%s\" (%s)\n",
457 		    tab->path,
458 		    buf);
459 		if (l == -1)
460 			die();
461 		load_page_from_str(tab, page);
462 		free(page);
463 
464 		close(tab->fd);
465 		tab->fd = -1;
466 		free(tab->path);
467 		tab->path = NULL;
468 	}
469 
470 	ui_on_tab_refresh(tab);
471 	ui_on_tab_loaded(tab);
472 }
473 
474 static void
475 handle_imsg_bookmark_ok(struct imsg *imsg, size_t datalen)
476 {
477 	int res;
478 
479 	if (datalen != sizeof(res))
480 		die();
481 
482 	memcpy(&res, imsg->data, sizeof(res));
483 	if (res == 0)
484 		message("Added to bookmarks!");
485 	else
486 		message("Failed to add to bookmarks: %s",
487 		    strerror(res));
488 }
489 
490 static void
491 handle_imsg_save_cert_ok(struct imsg *imsg, size_t datalen)
492 {
493 	int res;
494 
495 	if (datalen != sizeof(res))
496 		die();
497 	memcpy(&res, imsg->data, datalen);
498 	if (res != 0)
499 		message("Failed to save the cert for: %s",
500 		    strerror(res));
501 }
502 
503 static void
504 handle_imsg_update_cert_ok(struct imsg *imsg, size_t datalen)
505 {
506 	int res;
507 
508 	if (datalen != sizeof(res))
509 		die();
510 	memcpy(&res, imsg->data, datalen);
511 	if (!res)
512 		message("Failed to update the certificate");
513 }
514 
515 static void
516 handle_dispatch_imsg(int fd, short ev, void *d)
517 {
518 	struct imsgev	*iev = d;
519 	dispatch_imsg(iev, ev, handlers, sizeof(handlers));
520 }
521 
522 static void
523 load_page_from_str(struct tab *tab, const char *page)
524 {
525 	erase_buffer(&tab->buffer);
526 	gemtext_initparser(&tab->buffer.page);
527 	if (!tab->buffer.page.parse(&tab->buffer.page, page, strlen(page)))
528 		die();
529 	if (!tab->buffer.page.free(&tab->buffer.page))
530 		die();
531 	ui_on_tab_refresh(tab);
532 	ui_on_tab_loaded(tab);
533 }
534 
535 void
536 load_about_url(struct tab *tab, const char *url)
537 {
538 	tab->trust = TS_VERIFIED;
539 
540 	gemtext_initparser(&tab->buffer.page);
541 
542 	ui_send_fs(IMSG_GET, tab->id,
543 	    tab->hist_cur->h, strlen(tab->hist_cur->h)+1);
544 }
545 
546 void
547 load_gemini_url(struct tab *tab, const char *url)
548 {
549 	struct get_req	 req;
550 
551 	stop_tab(tab);
552 	tab->id = tab_new_id();
553 
554 	memset(&req, 0, sizeof(req));
555 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
556 	strlcpy(req.port, tab->uri.port, sizeof(req.host));
557 
558 	strlcpy(req.req, tab->hist_cur->h, sizeof(req.req));
559 	strlcat(req.req, "\r\n", sizeof(req.req));
560 
561 	req.proto = PROTO_GEMINI;
562 
563 	ui_send_net(IMSG_GET_RAW, tab->id,
564 	    &req, sizeof(req));
565 }
566 
567 void
568 load_via_proxy(struct tab *tab, const char *url, struct proxy *p)
569 {
570 	struct get_req req;
571 
572 	stop_tab(tab);
573 	tab->id = tab_new_id();
574 	tab->proxy = p;
575 
576 	memset(&req, 0, sizeof(req));
577 	strlcpy(req.host, p->host, sizeof(req.host));
578 	strlcpy(req.port, p->port, sizeof(req.host));
579 
580 	strlcpy(req.req, tab->hist_cur->h, sizeof(req.req));
581 	strlcat(req.req, "\r\n", sizeof(req.req));
582 
583 	req.proto = p->proto;
584 
585 	ui_send_net(IMSG_GET_RAW, tab->id,
586 	    &req, sizeof(req));
587 }
588 
589 /*
590  * Effectively load the given url in the given tab.  Return 1 when
591  * loading the page asynchronously, and thus when an erase_buffer can
592  * be done right after this function return, or 0 when loading the
593  * page synchronously.  In this last case, erase_buffer *MUST* be
594  * called by the handling function (such as load_page_from_str).
595  */
596 static int
597 do_load_url(struct tab *tab, const char *url)
598 {
599 	struct phos_uri	 uri;
600 	struct proto	*p;
601 	struct proxy	*proxy;
602 	char		*t;
603 
604 	tab->proxy = NULL;
605 
606 	if (tab->fd != -1) {
607 		close(tab->fd);
608 		tab->fd = -1;
609 		free(tab->path);
610 		tab->path = NULL;
611 	}
612 
613 	tab->trust = TS_UNKNOWN;
614 
615 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
616 	if (!phos_resolve_uri_from_str(&uri, url, &tab->uri)) {
617                 if (asprintf(&t, "#error loading %s\n>%s\n",
618 		    url, "Can't parse the URI") == -1)
619 			die();
620 		strlcpy(tab->hist_cur->h, url, sizeof(tab->hist_cur->h));
621 		load_page_from_str(tab, t);
622 		free(t);
623 		return 0;
624 	}
625 
626 	phos_serialize_uri(&tab->uri, tab->hist_cur->h,
627 	    sizeof(tab->hist_cur->h));
628 
629 	for (p = protos; p->schema != NULL; ++p) {
630 		if (!strcmp(tab->uri.scheme, p->schema)) {
631 			p->loadfn(tab, url);
632                         return 1;
633 		}
634 	}
635 
636 	TAILQ_FOREACH(proxy, &proxies, proxies) {
637 		if (!strcmp(tab->uri.scheme, proxy->match_proto)) {
638 			load_via_proxy(tab, url, proxy);
639 			return 1;
640 		}
641 	}
642 
643 	load_page_from_str(tab, err_pages[UNKNOWN_PROTOCOL]);
644 	return 0;
645 }
646 
647 /*
648  * Load url in tab.  If tab is marked as lazy, only prepare the url
649  * but don't load it.  If tab is lazy and a url was already prepared,
650  * do load it!
651  */
652 void
653 load_url(struct tab *tab, const char *url)
654 {
655 	int lazy;
656 
657 	lazy = tab->flags & TAB_LAZY;
658 
659 	if (lazy && tab->hist_cur != NULL) {
660 		lazy = 0;
661 		tab->flags &= ~TAB_LAZY;
662 	}
663 
664 	if (!lazy || tab->hist_cur == NULL) {
665 		if (tab->hist_cur != NULL)
666 			hist_clear_forward(&tab->hist,
667 			    TAILQ_NEXT(tab->hist_cur, entries));
668 
669 		if ((tab->hist_cur = calloc(1, sizeof(*tab->hist_cur))) == NULL) {
670 			event_loopbreak();
671 			return;
672 		}
673 
674 		strlcpy(tab->buffer.page.title, url,
675 		    sizeof(tab->buffer.page.title));
676 		hist_push(&tab->hist, tab->hist_cur);
677 
678 		if (lazy)
679 			strlcpy(tab->hist_cur->h, url,
680 			    sizeof(tab->hist_cur->h));
681 	}
682 
683 	if (!lazy && do_load_url(tab, url))
684 		erase_buffer(&tab->buffer);
685 }
686 
687 int
688 load_previous_page(struct tab *tab)
689 {
690 	struct hist	*h;
691 
692 	if ((h = TAILQ_PREV(tab->hist_cur, mhisthead, entries)) == NULL)
693 		return 0;
694 	tab->hist_cur = h;
695 	do_load_url(tab, h->h);
696 	return 1;
697 }
698 
699 int
700 load_next_page(struct tab *tab)
701 {
702 	struct hist	*h;
703 
704 	if ((h = TAILQ_NEXT(tab->hist_cur, entries)) == NULL)
705 		return 0;
706 	tab->hist_cur = h;
707 	do_load_url(tab, h->h);
708 	return 1;
709 }
710 
711 void
712 stop_tab(struct tab *tab)
713 {
714 	ui_send_net(IMSG_STOP, tab->id, NULL, 0);
715 
716 	if (tab->fd != -1) {
717 		close(tab->fd);
718 		tab->fd = -1;
719 		free(tab->path);
720 		tab->path = NULL;
721 		load_page_from_str(tab, "Stopped.\n");
722 	}
723 }
724 
725 void
726 add_to_bookmarks(const char *str)
727 {
728 	ui_send_fs(IMSG_BOOKMARK_PAGE, 0,
729 	    str, strlen(str)+1);
730 }
731 
732 void
733 save_session(void)
734 {
735 	struct tab	*tab;
736 	char		*t;
737 	int		 flags;
738 
739 	ui_send_fs(IMSG_SESSION_START, 0, NULL, 0);
740 
741 	TAILQ_FOREACH(tab, &tabshead, tabs) {
742 		flags = tab->flags;
743 		if (tab == current_tab)
744 			flags |= TAB_CURRENT;
745 
746 		t = tab->hist_cur->h;
747 		ui_send_fs(IMSG_SESSION_TAB, flags, t, strlen(t)+1);
748 
749 		t = tab->buffer.page.title;
750 		ui_send_fs(IMSG_SESSION_TAB_TITLE, 0, t, strlen(t)+1);
751 	}
752 
753 	ui_send_fs(IMSG_SESSION_END, 0, NULL, 0);
754 }
755 
756 /*
757  * Parse a line of the session file.  The format is:
758  *
759  *	URL [flags,...] [title]\n
760  */
761 static void
762 parse_session_line(char *line, const char **title, uint32_t *flags)
763 {
764 	char *s, *t, *ap;
765 
766 	*title = "";
767 	*flags = 0;
768 	if ((s = strchr(line, ' ')) == NULL)
769 		return;
770 
771 	*s++ = '\0';
772 
773         if ((t = strchr(s, ' ')) != NULL) {
774 		*t++ = '\0';
775 		*title = t;
776 	}
777 
778 	while ((ap = strsep(&s, ",")) != NULL) {
779 		if (*ap == '\0')
780 			;
781 		else if (!strcmp(ap, "current"))
782 			*flags |= TAB_CURRENT;
783 		else
784 			message("unknown tab flag: %s", ap);
785 	}
786 }
787 
788 static void
789 load_last_session(void)
790 {
791 	const char	*title;
792 	char		*nl, *line = NULL;
793 	uint32_t	 flags;
794 	size_t		 linesize = 0;
795 	ssize_t		 linelen;
796 	FILE		*session;
797 	struct tab	*tab, *curr = NULL;
798 
799 	if ((session = fopen(session_file, "r")) == NULL) {
800 		/* first time? */
801 		new_tab("about:new");
802 		switch_to_tab(new_tab("about:help"));
803 		return;
804 	}
805 
806 	while ((linelen = getline(&line, &linesize, session)) != -1) {
807                 if ((nl = strchr(line, '\n')) != NULL)
808 			*nl = '\0';
809 		parse_session_line(line, &title, &flags);
810 		if ((tab = new_tab(line)) == NULL)
811 			err(1, "new_tab");
812                 strlcpy(tab->buffer.page.title, title,
813 		    sizeof(tab->buffer.page.title));
814 		if (flags & TAB_CURRENT)
815 			curr = tab;
816 	}
817 
818 	if (ferror(session))
819 		message("error reading %s: %s",
820 		    session_file, strerror(errno));
821 	fclose(session);
822 	free(line);
823 
824 	if (curr != NULL)
825 		switch_to_tab(curr);
826 
827 	return;
828 }
829 
830 static pid_t
831 start_child(enum telescope_process p, const char *argv0, int fd)
832 {
833 	const char	*argv[4];
834 	int		 argc = 0;
835 	pid_t		 pid;
836 
837 	switch (pid = fork()) {
838 	case -1:
839 		die();
840 	case 0:
841 		break;
842 	default:
843 		close(fd);
844 		return pid;
845 	}
846 
847 	if (dup2(fd, 3) == -1)
848 		err(1, "cannot setup imsg fd");
849 
850 	argv[argc++] = argv0;
851 	switch (p) {
852 	case PROC_UI:
853 		errx(1, "Can't start ui process");
854 	case PROC_FS:
855 		argv[argc++] = "-Tf";
856 		break;
857 	case PROC_NET:
858 		argv[argc++] = "-Tn";
859 		break;
860 	}
861 
862 	argv[argc++] = NULL;
863 	execvp(argv0, (char *const *)argv);
864 	err(1, "execvp(%s)", argv0);
865 }
866 
867 static int
868 ui_send_net(int type, uint32_t peerid, const void *data,
869     uint16_t datalen)
870 {
871 	return imsg_compose_event(iev_net, type, peerid, 0, -1, data,
872 	    datalen);
873 }
874 
875 static int
876 ui_send_fs(int type, uint32_t peerid, const void *data, uint16_t datalen)
877 {
878 	return imsg_compose_event(iev_fs, type, peerid, 0, -1, data,
879 	    datalen);
880 }
881 
882 static void __attribute__((noreturn))
883 usage(int r)
884 {
885 	fprintf(stderr, "USAGE: %s [-hnv] [-c config] [url]\n",
886 	    getprogname());
887 	fprintf(stderr, "version: " PACKAGE " " VERSION "\n");
888 	exit(r);
889 }
890 
891 int
892 main(int argc, char * const *argv)
893 {
894 	struct imsgev	 net_ibuf, fs_ibuf;
895 	int		 pipe2net[2], pipe2fs[2];
896 	int		 ch, configtest = 0, fail = 0;
897 	int		 has_url = 0;
898 	int		 proc = -1;
899 	int		 sessionfd;
900 	char		 path[PATH_MAX];
901 	const char	*url = NEW_TAB_URL;
902 	const char	*argv0;
903 
904 	argv0 = argv[0];
905 
906 	signal(SIGCHLD, SIG_IGN);
907 	signal(SIGPIPE, SIG_IGN);
908 
909 	if (getenv("NO_COLOR") != NULL)
910 		enable_colors = 0;
911 
912 	strlcpy(path, getenv("HOME"), sizeof(path));
913 	strlcat(path, "/.telescope/config", sizeof(path));
914 
915 	while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
916 		switch (ch) {
917 		case 'C':
918 			exit(ui_print_colors());
919 		case 'c':
920 			fail = 1;
921 			strlcpy(path, optarg, sizeof(path));
922 			break;
923 		case 'n':
924 			configtest = 1;
925 			break;
926 		case 'h':
927 			usage(0);
928 		case 'T':
929 			switch (*optarg) {
930 			case 'f':
931 				proc = PROC_FS;
932 				break;
933 			case 'n':
934 				proc = PROC_NET;
935 				break;
936 			default:
937 				errx(1, "invalid process spec %c",
938 				    *optarg);
939 			}
940 			break;
941 		case 'v':
942 			printf("%s %s\n", PACKAGE_NAME, PACKAGE_VERSION);
943 			exit(0);
944 			break;
945 		default:
946 			usage(1);
947 		}
948 	}
949 
950 	argc -= optind;
951 	argv += optind;
952 
953 	if (proc != -1) {
954 		if (argc > 0)
955 			usage(1);
956 		else if (proc == PROC_FS)
957 			return fs_main();
958 		else if (proc == PROC_NET)
959 			return client_main();
960 		else
961 			usage(1);
962 	}
963 
964 	if (argc != 0) {
965 		has_url = 1;
966 		url = argv[0];
967 	}
968 
969 	/* setup keys before reading the config */
970 	TAILQ_INIT(&global_map.m);
971 	global_map.unhandled_input = global_key_unbound;
972 	TAILQ_INIT(&minibuffer_map.m);
973 
974 	config_init();
975 	parseconfig(path, fail);
976 	if (configtest){
977 		puts("config OK");
978 		exit(0);
979 	}
980 
981 	fs_init();
982 	if ((sessionfd = lock_session()) == -1)
983 		errx(1, "can't lock session, is another instance of "
984 		    "telescope already running?");
985 
986 	/* Start children. */
987 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2fs) == -1)
988 		err(1, "socketpair");
989 	start_child(PROC_FS, argv0, pipe2fs[1]);
990 	imsg_init(&fs_ibuf.ibuf, pipe2fs[0]);
991 	iev_fs = &fs_ibuf;
992 	iev_fs->handler = handle_dispatch_imsg;
993 
994 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2net) == -1)
995 		err(1, "socketpair");
996 	start_child(PROC_NET, argv0, pipe2net[1]);
997 	imsg_init(&net_ibuf.ibuf, pipe2net[0]);
998 	iev_net = &net_ibuf;
999 	iev_net->handler = handle_dispatch_imsg;
1000 
1001 	setproctitle("ui");
1002 
1003 	/* initialize tofu & load certificates */
1004 	tofu_init(&certs, 5, offsetof(struct tofu_entry, domain));
1005 	load_certs(&certs);
1006 
1007 	event_init();
1008 
1009 	/* Setup event handlers for pipes to fs/net */
1010 	iev_fs->events = EV_READ;
1011 	event_set(&iev_fs->ev, iev_fs->ibuf.fd, iev_fs->events,
1012 	    iev_fs->handler, iev_fs);
1013 	event_add(&iev_fs->ev, NULL);
1014 
1015 	iev_net->events = EV_READ;
1016 	event_set(&iev_net->ev, iev_net->ibuf.fd, iev_net->events,
1017 	    iev_net->handler, iev_net);
1018 	event_add(&iev_net->ev, NULL);
1019 
1020 	if (ui_init()) {
1021 		load_last_session();
1022 		if (has_url || TAILQ_EMPTY(&tabshead))
1023 			new_tab(url);
1024 
1025 		sandbox_ui_process();
1026 		ui_main_loop();
1027 		ui_end();
1028 	}
1029 
1030 	ui_send_fs(IMSG_QUIT, 0, NULL, 0);
1031 	ui_send_net(IMSG_QUIT, 0, NULL, 0);
1032 	imsg_flush(&iev_fs->ibuf);
1033 	imsg_flush(&iev_net->ibuf);
1034 
1035 	close(sessionfd);
1036 
1037 	return 0;
1038 }