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