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Date:: Sat Aug 14 20:52:22 2021 UTC
Message:: move more stuff outta telescope.c
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1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "compat.h"
18 
19 #include <sys/socket.h>
20 
21 #include <errno.h>
22 #include <getopt.h>
23 #include <limits.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 telescope.c:/^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) and crash.  It
265 		 * also makes sense to save it for the current session
266 		 * if the user accepted it.
267 		 */
268 		tofu_temp_trust(&certs, tab->uri.host, tab->uri.port, tab->cert);
269 
270 		ui_yornp("Save the new certificate?",
271 		    handle_maybe_save_new_cert, tab);
272 	} else {
273 		free(tab->cert);
274 		tab->cert = NULL;
275 	}
276 }
277 
278 static void
279 handle_maybe_save_new_cert(int accept, struct tab *tab)
280 {
281 	struct tofu_entry *e;
282 	const char *host, *port;
283 
284 	if (tab->proxy != NULL) {
285 		host = tab->proxy->host;
286 		port = tab->proxy->port;
287 	} else {
288 		host = tab->uri.host;
289 		port = tab->uri.port;
290 	}
291 
292 	if (!accept)
293 		goto end;
294 
295 	if ((e = calloc(1, sizeof(*e))) == NULL)
296 		die();
297 
298 	strlcpy(e->domain, host, sizeof(e->domain));
299 	if (*port != '\0' && strcmp(port, "1965")) {
300 		strlcat(e->domain, ":", sizeof(e->domain));
301 		strlcat(e->domain, port, sizeof(e->domain));
302 	}
303 	strlcpy(e->hash, tab->cert, sizeof(e->hash));
304 	ui_send_fs(IMSG_UPDATE_CERT, 0, e, sizeof(*e));
305 
306 	tofu_update(&certs, e);
307 
308 	tab->trust = TS_TRUSTED;
309 
310 end:
311 	free(tab->cert);
312 	tab->cert = NULL;
313 }
314 
315 static inline int
316 normalize_code(int n)
317 {
318 	if (n < 20) {
319 		if (n == 10 || n == 11)
320 			return n;
321 		return 10;
322 	} else if (n < 30) {
323 		return 20;
324 	} else if (n < 40) {
325 		if (n == 30 || n == 31)
326 			return n;
327 		return 30;
328 	} else if (n < 50) {
329 		if (n <= 44)
330 			return n;
331 		return 40;
332 	} else if (n < 60) {
333 		if (n <= 53 || n == 59)
334 			return n;
335 		return 50;
336 	} else if (n < 70) {
337 		if (n <= 62)
338 			return n;
339 		return 60;
340 	} else
341 		return MALFORMED_RESPONSE;
342 }
343 
344 static void
345 handle_imsg_got_code(struct imsg *imsg, size_t datalen)
346 {
347 	struct tab	*tab;
348 
349 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
350 		return;
351 
352 	if (sizeof(tab->code) != datalen)
353 		die();
354 
355 	memcpy(&tab->code, imsg->data, sizeof(tab->code));
356 	tab->code = normalize_code(tab->code);
357 	if (tab->code != 30 && tab->code != 31)
358 		tab->redirect_count = 0;
359 }
360 
361 static void
362 handle_imsg_got_meta(struct imsg *imsg, size_t datalen)
363 {
364 	struct tab	*tab;
365 
366 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
367 		return;
368 
369 	if (sizeof(tab->meta) <= datalen)
370 		die();
371 
372 	memcpy(tab->meta, imsg->data, datalen);
373 
374 	if (tab->code < 10) {	/* internal errors */
375 		load_page_from_str(tab, err_pages[tab->code]);
376 	} else if (tab->code < 20) {	/* 1x */
377 		load_page_from_str(tab, err_pages[tab->code]);
378 		ui_require_input(tab, tab->code == 11, PROTO_GEMINI);
379 	} else if (tab->code == 20) {
380 		if (setup_parser_for(tab)) {
381 			ui_send_net(IMSG_PROCEED, tab->id, NULL, 0);
382 		} else {
383 			load_page_from_str(tab, err_pages[UNKNOWN_TYPE_OR_CSET]);
384 			ui_yornp("Can't display page, wanna save?",
385 			    handle_maybe_save_page, tab);
386 		}
387 	} else if (tab->code < 40) { /* 3x */
388 		tab->redirect_count++;
389 
390 		/* TODO: make customizable? */
391 		if (tab->redirect_count > 5) {
392 			load_page_from_str(tab,
393 			    err_pages[TOO_MUCH_REDIRECTS]);
394 		} else
395 			do_load_url(tab, tab->meta, NULL);
396 	} else { /* 4x, 5x & 6x */
397 		load_page_from_str(tab, err_pages[tab->code]);
398 	}
399 }
400 
401 static void
402 handle_maybe_save_page(int dosave, struct tab *tab)
403 {
404 	if (dosave)
405 		ui_read("Save to path", handle_save_page_path, tab);
406 	else
407 		stop_tab(tab);
408 }
409 
410 static void
411 handle_save_page_path(const char *path, struct tab *tab)
412 {
413 	if (path == NULL) {
414 		stop_tab(tab);
415 		return;
416 	}
417 
418 	tab->path = strdup(path);
419 
420 	ui_send_fs(IMSG_FILE_OPEN, tab->id, path, strlen(path)+1);
421 }
422 
423 static void
424 handle_imsg_file_opened(struct imsg *imsg, size_t datalen)
425 {
426 	struct tab	*tab;
427 	char		*page;
428 	const char	*e;
429 	int		 l;
430 
431 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL) {
432 		if (imsg->fd != -1)
433 			close(imsg->fd);
434 		return;
435 	}
436 
437 	if (imsg->fd == -1) {
438 		stop_tab(tab);
439 
440 		e = imsg->data;
441 		if (e[datalen-1] != '\0')
442 			die();
443 		l = asprintf(&page, "# Can't open file\n\n> %s: %s\n",
444 		    tab->path, e);
445 		if (l == -1)
446 			die();
447 		load_page_from_str(tab, page);
448 		free(page);
449 	} else {
450 		tab->fd = imsg->fd;
451 		ui_send_net(IMSG_PROCEED, tab->id, NULL, 0);
452 	}
453 }
454 
455 static void
456 handle_imsg_buf(struct imsg *imsg, size_t datalen)
457 {
458 	struct tab	*tab;
459 	int		 l;
460 	char		*page, buf[FMT_SCALED_STRSIZE] = {0};
461 
462 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
463 		return;
464 
465 	tab->bytes += datalen;
466 	if (tab->fd == -1) {
467 		if (!parser_parse(tab, imsg->data, datalen))
468 			die();
469 	} else {
470 		write(tab->fd, imsg->data, datalen);
471 		fmt_scaled(tab->bytes, buf);
472 		l = asprintf(&page, "Saving to \"%s\"... (%s)\n",
473 		    tab->path,
474 		    buf);
475 		if (l == -1)
476 			die();
477 		load_page_from_str(tab, page);
478 		free(page);
479 	}
480 
481 	ui_on_tab_refresh(tab);
482 }
483 
484 static void
485 handle_imsg_eof(struct imsg *imsg, size_t datalen)
486 {
487 	struct tab	*tab;
488 	int		 l;
489 	char		*page, buf[FMT_SCALED_STRSIZE] = {0};
490 
491 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
492 		return;
493 
494 	if (tab->fd == -1) {
495 		if (!parser_free(tab))
496 			die();
497 	} else {
498 		fmt_scaled(tab->bytes, buf);
499 		l = asprintf(&page, "Saved to \"%s\" (%s)\n",
500 		    tab->path,
501 		    buf);
502 		if (l == -1)
503 			die();
504 		load_page_from_str(tab, page);
505 		free(page);
506 
507 		close(tab->fd);
508 		tab->fd = -1;
509 		free(tab->path);
510 		tab->path = NULL;
511 	}
512 
513 	ui_on_tab_refresh(tab);
514 	ui_on_tab_loaded(tab);
515 }
516 
517 static void
518 handle_imsg_bookmark_ok(struct imsg *imsg, size_t datalen)
519 {
520 	int res;
521 
522 	if (datalen != sizeof(res))
523 		die();
524 
525 	memcpy(&res, imsg->data, sizeof(res));
526 	if (res == 0)
527 		message("Added to bookmarks!");
528 	else
529 		message("Failed to add to bookmarks: %s",
530 		    strerror(res));
531 }
532 
533 static void
534 handle_imsg_save_cert_ok(struct imsg *imsg, size_t datalen)
535 {
536 	int res;
537 
538 	if (datalen != sizeof(res))
539 		die();
540 	memcpy(&res, imsg->data, datalen);
541 	if (res != 0)
542 		message("Failed to save the cert for: %s",
543 		    strerror(res));
544 }
545 
546 static void
547 handle_imsg_update_cert_ok(struct imsg *imsg, size_t datalen)
548 {
549 	int res;
550 
551 	if (datalen != sizeof(res))
552 		die();
553 	memcpy(&res, imsg->data, datalen);
554 	if (!res)
555 		message("Failed to update the certificate");
556 }
557 
558 static void
559 handle_dispatch_imsg(int fd, short ev, void *d)
560 {
561 	struct imsgev	*iev = d;
562 
563 	if (dispatch_imsg(iev, ev, handlers, sizeof(handlers)) == -1)
564 		err(1, "connection closed");
565 }
566 
567 static int
568 load_about_url(struct tab *tab, const char *url)
569 {
570 	tab->trust = TS_UNKNOWN;
571 	parser_init(tab, gemtext_initparser);
572 	return make_fs_request(tab, IMSG_GET, url);
573 }
574 
575 static int
576 load_file_url(struct tab *tab, const char *url)
577 {
578 	tab->trust = TS_UNKNOWN;
579 	return make_fs_request(tab, IMSG_GET_FILE, tab->uri.path);
580 }
581 
582 static int
583 load_finger_url(struct tab *tab, const char *url)
584 {
585 	struct get_req	 req;
586 	size_t		 len;
587 	char		*at;
588 
589 	memset(&req, 0, sizeof(req));
590 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
591 
592 	/*
593 	 * Sometimes the finger url have the user as path component
594 	 * (e.g. finger://thelambdalab.xyz/plugd), sometimes as
595 	 * userinfo (e.g. finger://cobradile@finger.farm).
596 	 */
597 	if ((at = strchr(tab->uri.host, '@')) != NULL) {
598 		len = at - tab->uri.host;
599 		memcpy(req.req, tab->uri.host, len);
600 
601 		if (len >= sizeof(req.req))
602 			die();
603 		req.req[len] = '\0';
604 
605 		strlcpy(req.host, at+1, sizeof(req.host));
606 	} else {
607 		strlcpy(req.host, tab->uri.host, sizeof(req.host));
608 
609 		/* +1 to skip the initial `/' */
610 		strlcpy(req.req, tab->uri.path+1, sizeof(req.req));
611 	}
612 	strlcat(req.req, "\r\n", sizeof(req.req));
613 
614 	parser_init(tab, textplain_initparser);
615 	return make_request(tab, &req, PROTO_FINGER, NULL);
616 }
617 
618 static int
619 load_gemini_url(struct tab *tab, const char *url)
620 {
621 	struct get_req	 req;
622 
623 	memset(&req, 0, sizeof(req));
624 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
625 	strlcpy(req.port, tab->uri.port, sizeof(req.host));
626 
627 	return make_request(tab, &req, PROTO_GEMINI, tab->hist_cur->h);
628 }
629 
630 static inline const char *
631 gopher_skip_selector(const char *path, int *ret_type)
632 {
633 	*ret_type = 0;
634 
635 	if (!strcmp(path, "/") || *path == '\0') {
636 		*ret_type = '1';
637 		return path;
638 	}
639 
640 	if (*path != '/')
641 		return path;
642 	path++;
643 
644 	switch (*ret_type = *path) {
645 	case '0':
646 	case '1':
647 	case '7':
648 		break;
649 
650 	default:
651 		*ret_type = 0;
652 		path -= 1;
653 		return path;
654 	}
655 
656 	path++;
657 	if (*path == '/')
658 		path++;
659 
660 	return path;
661 }
662 
663 static int
664 load_gopher_url(struct tab *tab, const char *url)
665 {
666 	struct get_req	 req;
667 	int		 type;
668 	const char	*path;
669 
670 	memset(&req, 0, sizeof(req));
671 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
672 	strlcpy(req.port, tab->uri.port, sizeof(req.host));
673 
674 	path = gopher_skip_selector(tab->uri.path, &type);
675 	switch (type) {
676 	case '0':
677 		parser_init(tab, textplain_initparser);
678 		break;
679 	case '1':
680 		parser_init(tab, gophermap_initparser);
681 		break;
682 	case '7':
683 		ui_require_input(tab, 0, PROTO_GOPHER);
684 		return load_page_from_str(tab, err_pages[10]);
685 	default:
686 		return load_page_from_str(tab, "Unknown gopher selector");
687 	}
688 
689 	strlcpy(req.req, path, sizeof(req.req));
690 	if (*tab->uri.query != '\0') {
691 		strlcat(req.req, "?", sizeof(req.req));
692 		strlcat(req.req, tab->uri.query, sizeof(req.req));
693 	}
694 	strlcat(req.req, "\r\n", sizeof(req.req));
695 
696 	return make_request(tab, &req, PROTO_GOPHER, NULL);
697 }
698 
699 static int
700 load_via_proxy(struct tab *tab, const char *url, struct proxy *p)
701 {
702 	struct get_req req;
703 
704 	memset(&req, 0, sizeof(req));
705 	strlcpy(req.host, p->host, sizeof(req.host));
706 	strlcpy(req.port, p->port, sizeof(req.host));
707 
708 	tab->proxy = p;
709 
710 	return make_request(tab, &req, p->proto, tab->hist_cur->h);
711 }
712 
713 static int
714 make_request(struct tab *tab, struct get_req *req, int proto, const char *r)
715 {
716 	stop_tab(tab);
717 	tab->id = tab_new_id();
718 	req->proto = proto;
719 
720 	if (r != NULL) {
721 		strlcpy(req->req, r, sizeof(req->req));
722 		strlcat(req->req, "\r\n", sizeof(req->req));
723 	}
724 
725 	ui_send_net(IMSG_GET_RAW, tab->id, req, sizeof(*req));
726 
727 	/*
728 	 * So the various load_*_url can `return make_request` and
729 	 * do_load_url is happy.
730 	 */
731 	return 1;
732 }
733 
734 static int
735 make_fs_request(struct tab *tab, int type, const char *r)
736 {
737 	stop_tab(tab);
738 	tab->id = tab_new_id();
739 
740 	ui_send_fs(type, tab->id, r, strlen(r)+1);
741 
742 	/*
743 	 * So load_{about,file}_url can `return make_fs_request` and
744 	 * do_load_url is happy.
745 	 */
746 	return 1;
747 }
748 
749 void
750 gopher_send_search_req(struct tab *tab, const char *text)
751 {
752 	struct get_req	req;
753 
754 	start_loading_anim(tab);
755 
756 	memset(&req, 0, sizeof(req));
757 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
758 	strlcpy(req.port, tab->uri.port, sizeof(req.host));
759 
760 	/* +2 to skip /7 */
761 	strlcpy(req.req, tab->uri.path+2, sizeof(req.req));
762 	if (*tab->uri.query != '\0') {
763 		strlcat(req.req, "?", sizeof(req.req));
764 		strlcat(req.req, tab->uri.query, sizeof(req.req));
765 	}
766 
767 	strlcat(req.req, "\t", sizeof(req.req));
768 	strlcat(req.req, text, sizeof(req.req));
769 	strlcat(req.req, "\r\n", sizeof(req.req));
770 
771 	erase_buffer(&tab->buffer);
772 	parser_init(tab, gophermap_initparser);
773 
774 	make_request(tab, &req, PROTO_GOPHER, NULL);
775 }
776 
777 /*
778  * Effectively load the given url in the given tab.  Return 1 when
779  * loading the page asynchronously, and thus when an erase_buffer can
780  * be done right after this function return, or 0 when loading the
781  * page synchronously.  In this last case, erase_buffer *MUST* be
782  * called by the handling function (such as load_page_from_str).
783  */
784 static int
785 do_load_url(struct tab *tab, const char *url, const char *base)
786 {
787 	struct phos_uri	 uri;
788 	struct proto	*p;
789 	struct proxy	*proxy;
790 	char		*t;
791 
792 	tab->proxy = NULL;
793 
794 	if (tab->fd != -1) {
795 		close(tab->fd);
796 		tab->fd = -1;
797 		free(tab->path);
798 		tab->path = NULL;
799 	}
800 
801 	tab->trust = TS_UNKNOWN;
802 
803 	if (base == NULL)
804 		memcpy(&uri, &tab->uri, sizeof(tab->uri));
805 	else
806 		phos_parse_absolute_uri(base, &uri);
807 
808 	if (!phos_resolve_uri_from_str(&uri, url, &tab->uri)) {
809 		if (asprintf(&t, "#error loading %s\n>%s\n",
810 		    url, "Can't parse the URI") == -1)
811 			die();
812 		strlcpy(tab->hist_cur->h, url, sizeof(tab->hist_cur->h));
813 		load_page_from_str(tab, t);
814 		free(t);
815 		return 0;
816 	}
817 
818 	phos_serialize_uri(&tab->uri, tab->hist_cur->h,
819 	    sizeof(tab->hist_cur->h));
820 
821 	for (p = protos; p->schema != NULL; ++p) {
822 		if (!strcmp(tab->uri.scheme, p->schema)) {
823 			/* patch the port */
824 			if (*tab->uri.port == '\0' && p->port != NULL)
825 				strlcpy(tab->uri.port, p->port,
826 				    sizeof(tab->uri.port));
827 
828 			return p->loadfn(tab, url);
829 		}
830 	}
831 
832 	TAILQ_FOREACH(proxy, &proxies, proxies) {
833 		if (!strcmp(tab->uri.scheme, proxy->match_proto))
834 			return load_via_proxy(tab, url, proxy);
835 	}
836 
837 	return load_page_from_str(tab, err_pages[UNKNOWN_PROTOCOL]);
838 }
839 
840 /*
841  * Load url in tab.  If tab is marked as lazy, only prepare the url
842  * but don't load it.  If tab is lazy and a url was already prepared,
843  * do load it!
844  */
845 void
846 load_url(struct tab *tab, const char *url, const char *base, int nohist)
847 {
848 	int lazy;
849 
850 	lazy = tab->flags & TAB_LAZY;
851 
852 	if (lazy && tab->hist_cur != NULL) {
853 		lazy = 0;
854 		tab->flags &= ~TAB_LAZY;
855 	}
856 
857 	/* can't have both nohist and lazy at the same time. */
858 	if (nohist && lazy)
859 		nohist = 0;
860 
861 	if (!nohist && (!lazy || tab->hist_cur == NULL)) {
862 		if (tab->hist_cur != NULL)
863 			hist_clear_forward(&tab->hist,
864 			    TAILQ_NEXT(tab->hist_cur, entries));
865 
866 		if ((tab->hist_cur = calloc(1, sizeof(*tab->hist_cur))) == NULL) {
867 			event_loopbreak();
868 			return;
869 		}
870 
871 		strlcpy(tab->buffer.page.title, url,
872 		    sizeof(tab->buffer.page.title));
873 		hist_push(&tab->hist, tab->hist_cur);
874 
875 		if (lazy)
876 			strlcpy(tab->hist_cur->h, url,
877 			    sizeof(tab->hist_cur->h));
878 	}
879 
880 	if (!lazy && do_load_url(tab, url, base))
881 		erase_buffer(&tab->buffer);
882 }
883 
884 void
885 load_url_in_tab(struct tab *tab, const char *url, const char *base, int nohist)
886 {
887 	if (!operating) {
888 		load_url(tab, url, base, nohist);
889 		return;
890 	}
891 
892 	autosave_hook();
893 
894 	message("Loading %s...", url);
895 	start_loading_anim(tab);
896 	load_url(tab, url, base, nohist);
897 }
898 
899 int
900 load_previous_page(struct tab *tab)
901 {
902 	struct hist	*h;
903 
904 	if ((h = TAILQ_PREV(tab->hist_cur, mhisthead, entries)) == NULL)
905 		return 0;
906 	tab->hist_cur = h;
907 	do_load_url(tab, h->h, NULL);
908 	return 1;
909 }
910 
911 int
912 load_next_page(struct tab *tab)
913 {
914 	struct hist	*h;
915 
916 	if ((h = TAILQ_NEXT(tab->hist_cur, entries)) == NULL)
917 		return 0;
918 	tab->hist_cur = h;
919 	do_load_url(tab, h->h, NULL);
920 	return 1;
921 }
922 
923 void
924 add_to_bookmarks(const char *str)
925 {
926 	ui_send_fs(IMSG_BOOKMARK_PAGE, 0,
927 	    str, strlen(str)+1);
928 }
929 
930 static pid_t
931 start_child(enum telescope_process p, const char *argv0, int fd)
932 {
933 	const char	*argv[4];
934 	int		 argc = 0;
935 	pid_t		 pid;
936 
937 	switch (pid = fork()) {
938 	case -1:
939 		die();
940 	case 0:
941 		break;
942 	default:
943 		close(fd);
944 		return pid;
945 	}
946 
947 	if (dup2(fd, 3) == -1)
948 		err(1, "cannot setup imsg fd");
949 
950 	argv[argc++] = argv0;
951 	switch (p) {
952 	case PROC_UI:
953 		errx(1, "Can't start ui process");
954 	case PROC_FS:
955 		argv[argc++] = "-Tf";
956 		break;
957 	case PROC_NET:
958 		argv[argc++] = "-Tn";
959 		break;
960 	}
961 
962 	argv[argc++] = NULL;
963 	execvp(argv0, (char *const *)argv);
964 	err(1, "execvp(%s)", argv0);
965 }
966 
967 int
968 ui_send_net(int type, uint32_t peerid, const void *data,
969     uint16_t datalen)
970 {
971 	return imsg_compose_event(iev_net, type, peerid, 0, -1, data,
972 	    datalen);
973 }
974 
975 int
976 ui_send_fs(int type, uint32_t peerid, const void *data, uint16_t datalen)
977 {
978 	return imsg_compose_event(iev_fs, type, peerid, 0, -1, data,
979 	    datalen);
980 }
981 
982 static void __attribute__((noreturn))
983 usage(int r)
984 {
985 	fprintf(stderr, "USAGE: %s [-hnv] [-c config] [url]\n",
986 	    getprogname());
987 	fprintf(stderr, "version: " PACKAGE " " VERSION "\n");
988 	exit(r);
989 }
990 
991 int
992 main(int argc, char * const *argv)
993 {
994 	struct imsgev	 net_ibuf, fs_ibuf;
995 	int		 pipe2net[2], pipe2fs[2];
996 	int		 ch, configtest = 0, fail = 0;
997 	int		 has_url = 0;
998 	int		 proc = -1;
999 	int		 sessionfd;
1000 	char		 path[PATH_MAX];
1001 	const char	*url = NEW_TAB_URL;
1002 	const char	*argv0;
1003 
1004 	argv0 = argv[0];
1005 
1006 	signal(SIGCHLD, SIG_IGN);
1007 	signal(SIGPIPE, SIG_IGN);
1008 
1009 	if (getenv("NO_COLOR") != NULL)
1010 		enable_colors = 0;
1011 
1012 	strlcpy(path, getenv("HOME"), sizeof(path));
1013 	strlcat(path, "/.telescope/config", sizeof(path));
1014 
1015 	while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
1016 		switch (ch) {
1017 		case 'C':
1018 			exit(ui_print_colors());
1019 		case 'c':
1020 			fail = 1;
1021 			strlcpy(path, optarg, sizeof(path));
1022 			break;
1023 		case 'n':
1024 			configtest = 1;
1025 			break;
1026 		case 'h':
1027 			usage(0);
1028 		case 'T':
1029 			switch (*optarg) {
1030 			case 'f':
1031 				proc = PROC_FS;
1032 				break;
1033 			case 'n':
1034 				proc = PROC_NET;
1035 				break;
1036 			default:
1037 				errx(1, "invalid process spec %c",
1038 				    *optarg);
1039 			}
1040 			break;
1041 		case 'v':
1042 			printf("%s %s\n", PACKAGE_NAME, PACKAGE_VERSION);
1043 			exit(0);
1044 			break;
1045 		default:
1046 			usage(1);
1047 		}
1048 	}
1049 
1050 	argc -= optind;
1051 	argv += optind;
1052 
1053 	if (proc != -1) {
1054 		if (argc > 0)
1055 			usage(1);
1056 		else if (proc == PROC_FS)
1057 			return fs_main();
1058 		else if (proc == PROC_NET)
1059 			return net_main();
1060 		else
1061 			usage(1);
1062 	}
1063 
1064 	if (argc != 0) {
1065 		has_url = 1;
1066 		url = argv[0];
1067 	}
1068 
1069 	/* setup keys before reading the config */
1070 	TAILQ_INIT(&global_map.m);
1071 	global_map.unhandled_input = global_key_unbound;
1072 	TAILQ_INIT(&minibuffer_map.m);
1073 
1074 	config_init();
1075 	parseconfig(path, fail);
1076 	if (configtest){
1077 		puts("config OK");
1078 		exit(0);
1079 	}
1080 
1081 	fs_init();
1082 	if ((sessionfd = lock_session()) == -1)
1083 		errx(1, "can't lock session, is another instance of "
1084 		    "telescope already running?");
1085 
1086 	/* Start children. */
1087 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2fs) == -1)
1088 		err(1, "socketpair");
1089 	start_child(PROC_FS, argv0, pipe2fs[1]);
1090 	imsg_init(&fs_ibuf.ibuf, pipe2fs[0]);
1091 	iev_fs = &fs_ibuf;
1092 	iev_fs->handler = handle_dispatch_imsg;
1093 
1094 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2net) == -1)
1095 		err(1, "socketpair");
1096 	start_child(PROC_NET, argv0, pipe2net[1]);
1097 	imsg_init(&net_ibuf.ibuf, pipe2net[0]);
1098 	iev_net = &net_ibuf;
1099 	iev_net->handler = handle_dispatch_imsg;
1100 
1101 	setproctitle("ui");
1102 
1103 	/* initialize tofu & load certificates */
1104 	tofu_init(&certs, 5, offsetof(struct tofu_entry, domain));
1105 	load_certs(&certs);
1106 
1107 	event_init();
1108 
1109 	/* Setup event handler for the autosave */
1110 	autosave_init();
1111 
1112 	/* Setup event handlers for pipes to fs/net */
1113 	iev_fs->events = EV_READ;
1114 	event_set(&iev_fs->ev, iev_fs->ibuf.fd, iev_fs->events,
1115 	    iev_fs->handler, iev_fs);
1116 	event_add(&iev_fs->ev, NULL);
1117 
1118 	iev_net->events = EV_READ;
1119 	event_set(&iev_net->ev, iev_net->ibuf.fd, iev_net->events,
1120 	    iev_net->handler, iev_net);
1121 	event_add(&iev_net->ev, NULL);
1122 
1123 	if (ui_init()) {
1124 		load_last_session();
1125 		if (has_url || TAILQ_EMPTY(&tabshead))
1126 			new_tab(url, NULL, NULL);
1127 
1128 		sandbox_ui_process();
1129 		operating = 1;
1130 		ui_main_loop();
1131 		ui_end();
1132 	}
1133 
1134 	ui_send_fs(IMSG_QUIT, 0, NULL, 0);
1135 	ui_send_net(IMSG_QUIT, 0, NULL, 0);
1136 	imsg_flush(&iev_fs->ibuf);
1137 	imsg_flush(&iev_net->ibuf);
1138 
1139 	close(sessionfd);
1140 
1141 	return 0;
1142 }