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