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Date:: Fri Aug 13 09:44:43 2021 UTC
Message:: add make_fs_request
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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 "telescope.h"
34 #include "ui.h"
35 
36 static struct option longopts[] = {
37 	{"colors",	no_argument,	NULL,	'c'},
38 	{"help",	no_argument,	NULL,	'h'},
39 	{"version",	no_argument,	NULL,	'v'},
40 	{NULL,		0,		NULL,	0},
41 };
42 
43 static const char *opts = "Cc:hnT:v";
44 
45 static struct imsgev	*iev_fs, *iev_net;
46 
47 struct tabshead		 tabshead = TAILQ_HEAD_INITIALIZER(tabshead);
48 struct proxylist	 proxies = TAILQ_HEAD_INITIALIZER(proxies);
49 
50 enum telescope_process {
51 	PROC_UI,
52 	PROC_FS,
53 	PROC_NET,
54 };
55 
56 #define CANNOT_FETCH		0
57 #define TOO_MUCH_REDIRECTS	1
58 #define MALFORMED_RESPONSE	2
59 #define UNKNOWN_TYPE_OR_CSET	3
60 #define UNKNOWN_PROTOCOL	4
61 
62 /* XXX: keep in sync with telescope.c:/^normalize_code/ */
63 const char *err_pages[70] = {
64 	[CANNOT_FETCH]		= "# Couldn't load the page\n",
65 	[TOO_MUCH_REDIRECTS]	= "# Too much redirects\n",
66 	[MALFORMED_RESPONSE]	= "# Got a malformed response\n",
67 	[UNKNOWN_TYPE_OR_CSET]	= "# Unsupported type or charset\n",
68 	[UNKNOWN_PROTOCOL]	= "# Unknown protocol\n",
69 
70 	[10] = "# Input required\n",
71 	[11] = "# Input required\n",
72 	[40] = "# Temporary failure\n",
73 	[41] = "# Server unavailable\n",
74 	[42] = "# CGI error\n",
75 	[43] = "# Proxy error\n",
76 	[44] = "# Slow down\n",
77 	[50] = "# Permanent failure\n",
78 	[51] = "# Not found\n",
79 	[52] = "# Gone\n",
80 	[53] = "# Proxy request refused\n",
81 	[59] = "# Bad request\n",
82 	[60] = "# Client certificate required\n",
83 	[61] = "# Certificate not authorised\n",
84 	[62] = "# Certificate not valid\n"
85 };
86 
87 static void		 die(void) __attribute__((__noreturn__));
88 static struct tab	*tab_by_id(uint32_t);
89 static void		 handle_imsg_err(struct imsg*, size_t);
90 static void		 handle_imsg_check_cert(struct imsg*, size_t);
91 static void		 handle_check_cert_user_choice(int, struct tab *);
92 static void		 handle_maybe_save_new_cert(int, struct tab *);
93 static void		 handle_imsg_got_code(struct imsg*, size_t);
94 static void		 handle_imsg_got_meta(struct imsg*, size_t);
95 static void		 handle_maybe_save_page(int, struct tab *);
96 static void		 handle_save_page_path(const char *, struct tab *);
97 static void		 handle_imsg_file_opened(struct imsg*, size_t);
98 static void		 handle_imsg_buf(struct imsg*, size_t);
99 static void		 handle_imsg_eof(struct imsg*, size_t);
100 static void		 handle_imsg_bookmark_ok(struct imsg*, size_t);
101 static void		 handle_imsg_save_cert_ok(struct imsg*, size_t);
102 static void		 handle_imsg_update_cert_ok(struct imsg *, size_t);
103 static void		 handle_dispatch_imsg(int, short, void*);
104 static int		 load_page_from_str(struct tab*, const char*);
105 static int		 load_about_url(struct tab*, const char*);
106 static int		 load_finger_url(struct tab *, const char *);
107 static int		 load_gemini_url(struct tab*, const char*);
108 static int		 load_gopher_url(struct tab *, const char *);
109 static int		 load_via_proxy(struct tab *, const char *,
110 			     struct proxy *);
111 static int		 make_request(struct tab *, struct get_req *, int,
112 			     const char *);
113 static int		 make_fs_request(struct tab *, int, const char *);
114 static int		 do_load_url(struct tab*, const char *, const char *);
115 static void		 parse_session_line(char *, const char **, uint32_t *);
116 static void		 load_last_session(void);
117 static pid_t		 start_child(enum telescope_process, const char *, int);
118 static int		 ui_send_net(int, uint32_t, const void *, uint16_t);
119 static int		 ui_send_fs(int, uint32_t, const void *, uint16_t);
120 
121 static struct proto {
122 	const char	*schema;
123 	const char	*port;
124 	int		 (*loadfn)(struct tab*, const char*);
125 } protos[] = {
126 	{"about",	NULL,	load_about_url},
127 	{"finger",	"79",	load_finger_url},
128 	{"gemini",	"1965",	load_gemini_url},
129 	{"gopher",	"70",	load_gopher_url},
130 	{NULL, NULL, NULL},
131 };
132 
133 static imsg_handlerfn *handlers[] = {
134 	[IMSG_ERR] = handle_imsg_err,
135 	[IMSG_CHECK_CERT] = handle_imsg_check_cert,
136 	[IMSG_GOT_CODE] = handle_imsg_got_code,
137 	[IMSG_GOT_META] = handle_imsg_got_meta,
138 	[IMSG_BUF] = handle_imsg_buf,
139 	[IMSG_EOF] = handle_imsg_eof,
140 	[IMSG_BOOKMARK_OK] = handle_imsg_bookmark_ok,
141 	[IMSG_SAVE_CERT_OK] = handle_imsg_save_cert_ok,
142 	[IMSG_UPDATE_CERT_OK] = handle_imsg_update_cert_ok,
143 	[IMSG_FILE_OPENED] = handle_imsg_file_opened,
144 };
145 
146 static struct ohash	certs;
147 
148 static void __attribute__((__noreturn__))
149 die(void)
150 {
151 	abort(); 		/* TODO */
152 }
153 
154 static struct tab *
155 tab_by_id(uint32_t id)
156 {
157 	struct tab *t;
158 
159 	TAILQ_FOREACH(t, &tabshead, tabs) {
160 		if (t->id == id)
161 			return t;
162 	}
163 
164 	return NULL;
165 }
166 
167 static void
168 handle_imsg_err(struct imsg *imsg, size_t datalen)
169 {
170 	struct tab	*tab;
171 	char		*page;
172 
173 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
174 		return;
175 
176 	page = imsg->data;
177 	page[datalen-1] = '\0';
178 
179 	if (asprintf(&page, "# Error loading %s\n\n> %s\n",
180 	    tab->hist_cur->h, page) == -1)
181 		die();
182 	load_page_from_str(tab, page);
183 	free(page);
184 }
185 
186 static void
187 handle_imsg_check_cert(struct imsg *imsg, size_t datalen)
188 {
189 	const char		*hash, *host, *port;
190 	int			 tofu_res;
191 	struct tofu_entry	*e;
192 	struct tab		*tab;
193 
194 	hash = imsg->data;
195 	if (hash[datalen-1] != '\0')
196 		abort();
197 
198 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
199 		return;
200 
201 	if (tab->proxy != NULL) {
202 		host = tab->proxy->host;
203 		port = tab->proxy->port;
204 	} else {
205 		host = tab->uri.host;
206 		port = tab->uri.port;
207 	}
208 
209 	if ((e = tofu_lookup(&certs, host, port)) == NULL) {
210 		/* TODO: an update in libressl/libretls changed
211 		 * significantly.  Find a better approach at storing
212 		 * the certs! */
213 		if (datalen > sizeof(e->hash))
214 			abort();
215 
216 		tofu_res = 1;	/* trust on first use */
217 		if ((e = calloc(1, sizeof(*e))) == NULL)
218 			abort();
219 		strlcpy(e->domain, host, sizeof(e->domain));
220 		if (*port != '\0' && strcmp(port, "1965")) {
221 			strlcat(e->domain, ":", sizeof(e->domain));
222 			strlcat(e->domain, port, sizeof(e->domain));
223 		}
224 		strlcpy(e->hash, hash, sizeof(e->hash));
225 		tofu_add(&certs, e);
226 		ui_send_fs(IMSG_SAVE_CERT, tab->id, e, sizeof(*e));
227 	} else
228 		tofu_res = !strcmp(hash, e->hash);
229 
230 	if (tofu_res) {
231 		if (e->verified == -1)
232 			tab->trust = TS_TEMP_TRUSTED;
233 		else if (e->verified == 1)
234 			tab->trust = TS_VERIFIED;
235 		else
236 			tab->trust = TS_TRUSTED;
237 
238 		ui_send_net(IMSG_CERT_STATUS, imsg->hdr.peerid,
239 		    &tofu_res, sizeof(tofu_res));
240 	} else {
241 		tab->trust = TS_UNTRUSTED;
242 		load_page_from_str(tab, "# Certificate mismatch\n");
243 		if ((tab->cert = strdup(hash)) == NULL)
244 			die();
245 		ui_yornp("Certificate mismatch.  Proceed?",
246 		    handle_check_cert_user_choice, tab);
247 	}
248 }
249 
250 static void
251 handle_check_cert_user_choice(int accept, struct tab *tab)
252 {
253 	ui_send_net(IMSG_CERT_STATUS, tab->id, &accept,
254 	    sizeof(accept));
255 
256 	if (accept) {
257 		/*
258 		 * trust the certificate for this session only.  If
259 		 * the page results in a redirect while we're asking
260 		 * the user to save, we'll end up with an invalid
261 		 * tabid (one request == one tab id) and crash.  It
262 		 * also makes sense to save it for the current session
263 		 * if the user accepted it.
264 		 */
265 		tofu_temp_trust(&certs, tab->uri.host, tab->uri.port, tab->cert);
266 
267 		ui_yornp("Save the new certificate?",
268 		    handle_maybe_save_new_cert, tab);
269 	} else {
270 		free(tab->cert);
271 		tab->cert = NULL;
272 	}
273 }
274 
275 static void
276 handle_maybe_save_new_cert(int accept, struct tab *tab)
277 {
278 	struct tofu_entry *e;
279 	const char *host, *port;
280 
281 	if (tab->proxy != NULL) {
282 		host = tab->proxy->host;
283 		port = tab->proxy->port;
284 	} else {
285 		host = tab->uri.host;
286 		port = tab->uri.port;
287 	}
288 
289 	if (!accept)
290 		goto end;
291 
292 	if ((e = calloc(1, sizeof(*e))) == NULL)
293 		die();
294 
295 	strlcpy(e->domain, host, sizeof(e->domain));
296 	if (*port != '\0' && strcmp(port, "1965")) {
297 		strlcat(e->domain, ":", sizeof(e->domain));
298 		strlcat(e->domain, port, sizeof(e->domain));
299 	}
300 	strlcpy(e->hash, tab->cert, sizeof(e->hash));
301 	ui_send_fs(IMSG_UPDATE_CERT, 0, e, sizeof(*e));
302 
303 	tofu_update(&certs, e);
304 
305 	tab->trust = TS_TRUSTED;
306 
307 end:
308 	free(tab->cert);
309 	tab->cert = NULL;
310 }
311 
312 static inline int
313 normalize_code(int n)
314 {
315 	if (n < 20) {
316 		if (n == 10 || n == 11)
317 			return n;
318 		return 10;
319 	} else if (n < 30) {
320 		return 20;
321 	} else if (n < 40) {
322 		if (n == 30 || n == 31)
323 			return n;
324 		return 30;
325 	} else if (n < 50) {
326 		if (n <= 44)
327 			return n;
328 		return 40;
329 	} else if (n < 60) {
330 		if (n <= 53 || n == 59)
331 			return n;
332 		return 50;
333 	} else if (n < 70) {
334 		if (n <= 62)
335 			return n;
336 		return 60;
337 	} else
338 		return MALFORMED_RESPONSE;
339 }
340 
341 static void
342 handle_imsg_got_code(struct imsg *imsg, size_t datalen)
343 {
344 	struct tab	*tab;
345 
346 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
347 		return;
348 
349 	if (sizeof(tab->code) != datalen)
350 		die();
351 
352 	memcpy(&tab->code, imsg->data, sizeof(tab->code));
353 	tab->code = normalize_code(tab->code);
354 	if (tab->code != 30 && tab->code != 31)
355 		tab->redirect_count = 0;
356 }
357 
358 static void
359 handle_imsg_got_meta(struct imsg *imsg, size_t datalen)
360 {
361 	struct tab	*tab;
362 
363 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
364 		return;
365 
366 	if (sizeof(tab->meta) <= datalen)
367 		die();
368 
369 	memcpy(tab->meta, imsg->data, datalen);
370 
371 	if (tab->code < 10) {	/* internal errors */
372 		load_page_from_str(tab, err_pages[tab->code]);
373 	} else if (tab->code < 20) {	/* 1x */
374 		load_page_from_str(tab, err_pages[tab->code]);
375 		ui_require_input(tab, tab->code == 11, PROTO_GEMINI);
376 	} else if (tab->code == 20) {
377 		if (setup_parser_for(tab)) {
378 			ui_send_net(IMSG_PROCEED, tab->id, NULL, 0);
379 		} else {
380 			load_page_from_str(tab, err_pages[UNKNOWN_TYPE_OR_CSET]);
381 			ui_yornp("Can't display page, wanna save?",
382 			    handle_maybe_save_page, tab);
383 		}
384 	} else if (tab->code < 40) { /* 3x */
385 		tab->redirect_count++;
386 
387 		/* TODO: make customizable? */
388 		if (tab->redirect_count > 5) {
389 			load_page_from_str(tab,
390 			    err_pages[TOO_MUCH_REDIRECTS]);
391 		} else
392 			do_load_url(tab, tab->meta, NULL);
393 	} else { /* 4x, 5x & 6x */
394 		load_page_from_str(tab, err_pages[tab->code]);
395 	}
396 }
397 
398 static void
399 handle_maybe_save_page(int dosave, struct tab *tab)
400 {
401 	if (dosave)
402 		ui_read("Save to path", handle_save_page_path, tab);
403 	else
404 		stop_tab(tab);
405 }
406 
407 static void
408 handle_save_page_path(const char *path, struct tab *tab)
409 {
410 	if (path == NULL) {
411 		stop_tab(tab);
412 		return;
413 	}
414 
415 	tab->path = strdup(path);
416 
417 	ui_send_fs(IMSG_FILE_OPEN, tab->id, path, strlen(path)+1);
418 }
419 
420 static void
421 handle_imsg_file_opened(struct imsg *imsg, size_t datalen)
422 {
423 	struct tab	*tab;
424 	char		*page;
425 	const char	*e;
426 	int		 l;
427 
428 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL) {
429 		if (imsg->fd != -1)
430 			close(imsg->fd);
431 		return;
432 	}
433 
434 	if (imsg->fd == -1) {
435 		stop_tab(tab);
436 
437 		e = imsg->data;
438 		if (e[datalen-1] != '\0')
439 			die();
440 		l = asprintf(&page, "# Can't open file\n\n> %s: %s\n",
441 		    tab->path, e);
442 		if (l == -1)
443 			die();
444 		load_page_from_str(tab, page);
445 		free(page);
446 	} else {
447 		tab->fd = imsg->fd;
448 		ui_send_net(IMSG_PROCEED, tab->id, NULL, 0);
449 	}
450 }
451 
452 static void
453 handle_imsg_buf(struct imsg *imsg, size_t datalen)
454 {
455 	struct tab	*tab;
456 	int		 l;
457 	char		*page, buf[FMT_SCALED_STRSIZE] = {0};
458 
459 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
460 		return;
461 
462 	tab->bytes += datalen;
463 	if (tab->fd == -1) {
464 		if (!parser_parse(tab, imsg->data, datalen))
465 			die();
466 	} else {
467 		write(tab->fd, imsg->data, datalen);
468 		fmt_scaled(tab->bytes, buf);
469 		l = asprintf(&page, "Saving to \"%s\"... (%s)\n",
470 		    tab->path,
471 		    buf);
472 		if (l == -1)
473 			die();
474 		load_page_from_str(tab, page);
475 		free(page);
476 	}
477 
478 	ui_on_tab_refresh(tab);
479 }
480 
481 static void
482 handle_imsg_eof(struct imsg *imsg, size_t datalen)
483 {
484 	struct tab	*tab;
485 	int		 l;
486 	char		*page, buf[FMT_SCALED_STRSIZE] = {0};
487 
488 	if ((tab = tab_by_id(imsg->hdr.peerid)) == NULL)
489 		return;
490 
491 	if (tab->fd == -1) {
492 		if (!parser_free(tab))
493 			die();
494 	} else {
495 		fmt_scaled(tab->bytes, buf);
496 		l = asprintf(&page, "Saved to \"%s\" (%s)\n",
497 		    tab->path,
498 		    buf);
499 		if (l == -1)
500 			die();
501 		load_page_from_str(tab, page);
502 		free(page);
503 
504 		close(tab->fd);
505 		tab->fd = -1;
506 		free(tab->path);
507 		tab->path = NULL;
508 	}
509 
510 	ui_on_tab_refresh(tab);
511 	ui_on_tab_loaded(tab);
512 }
513 
514 static void
515 handle_imsg_bookmark_ok(struct imsg *imsg, size_t datalen)
516 {
517 	int res;
518 
519 	if (datalen != sizeof(res))
520 		die();
521 
522 	memcpy(&res, imsg->data, sizeof(res));
523 	if (res == 0)
524 		message("Added to bookmarks!");
525 	else
526 		message("Failed to add to bookmarks: %s",
527 		    strerror(res));
528 }
529 
530 static void
531 handle_imsg_save_cert_ok(struct imsg *imsg, size_t datalen)
532 {
533 	int res;
534 
535 	if (datalen != sizeof(res))
536 		die();
537 	memcpy(&res, imsg->data, datalen);
538 	if (res != 0)
539 		message("Failed to save the cert for: %s",
540 		    strerror(res));
541 }
542 
543 static void
544 handle_imsg_update_cert_ok(struct imsg *imsg, size_t datalen)
545 {
546 	int res;
547 
548 	if (datalen != sizeof(res))
549 		die();
550 	memcpy(&res, imsg->data, datalen);
551 	if (!res)
552 		message("Failed to update the certificate");
553 }
554 
555 static void
556 handle_dispatch_imsg(int fd, short ev, void *d)
557 {
558 	struct imsgev	*iev = d;
559 
560 	if (dispatch_imsg(iev, ev, handlers, sizeof(handlers)) == -1)
561 		err(1, "connection closed");
562 }
563 
564 static int
565 load_page_from_str(struct tab *tab, const char *page)
566 {
567 	erase_buffer(&tab->buffer);
568 	parser_init(tab, gemtext_initparser);
569 	if (!tab->buffer.page.parse(&tab->buffer.page, page, strlen(page)))
570 		die();
571 	if (!tab->buffer.page.free(&tab->buffer.page))
572 		die();
573 	ui_on_tab_refresh(tab);
574 	ui_on_tab_loaded(tab);
575 	return 0;
576 }
577 
578 static int
579 load_about_url(struct tab *tab, const char *url)
580 {
581 	tab->trust = TS_VERIFIED;
582 	parser_init(tab, gemtext_initparser);
583 	return make_fs_request(tab, IMSG_GET, url);
584 }
585 
586 static int
587 load_finger_url(struct tab *tab, const char *url)
588 {
589 	struct get_req	 req;
590 	size_t		 len;
591 	char		*at;
592 
593 	memset(&req, 0, sizeof(req));
594 	strlcpy(req.port, tab->uri.port, sizeof(req.port));
595 
596 	/*
597 	 * Sometimes the finger url have the user as path component
598 	 * (e.g. finger://thelambdalab.xyz/plugd), sometimes as
599 	 * userinfo (e.g. finger://cobradile@finger.farm).
600 	 */
601 	if ((at = strchr(tab->uri.host, '@')) != NULL) {
602 		len = at - tab->uri.host;
603 		memcpy(req.req, tab->uri.host, len);
604 
605 		if (len >= sizeof(req.req))
606 			die();
607 		req.req[len] = '\0';
608 
609 		strlcpy(req.host, at+1, sizeof(req.host));
610 	} else {
611 		strlcpy(req.host, tab->uri.host, sizeof(req.host));
612 
613 		/* +1 to skip the initial `/' */
614 		strlcpy(req.req, tab->uri.path+1, sizeof(req.req));
615 	}
616 	strlcat(req.req, "\r\n", sizeof(req.req));
617 
618 	parser_init(tab, textplain_initparser);
619 	return make_request(tab, &req, PROTO_FINGER, NULL);
620 }
621 
622 static int
623 load_gemini_url(struct tab *tab, const char *url)
624 {
625 	struct get_req	 req;
626 
627 	memset(&req, 0, sizeof(req));
628 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
629 	strlcpy(req.port, tab->uri.port, sizeof(req.host));
630 
631 	return make_request(tab, &req, PROTO_GEMINI, tab->hist_cur->h);
632 }
633 
634 static int
635 load_gopher_url(struct tab *tab, const char *url)
636 {
637 	struct get_req	 req;
638 	const char	*path;
639 
640 	memset(&req, 0, sizeof(req));
641 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
642 	strlcpy(req.port, tab->uri.port, sizeof(req.host));
643 
644 	path = tab->uri.path;
645 	if (!strcmp(path, "/") || *path == '\0') {
646 		/* expect the top directory to be a gophermap */
647 		parser_init(tab, gophermap_initparser);
648 	} else if (has_prefix(path, "/1/")) {
649 		/* gophermap menu/submenu */
650 		parser_init(tab, gophermap_initparser);
651 		path += 2;
652 	} else if (has_prefix(path, "/0/")) {
653 		parser_init(tab, textplain_initparser);
654 		path += 2;
655 	} else if (has_prefix(path, "/7/")) {
656 		/* show input request if there is no query */
657 		ui_require_input(tab, 0, PROTO_GOPHER);
658 		return load_page_from_str(tab, err_pages[10]);
659 	} else {
660 		return 0;
661 	}
662 
663 	strlcpy(req.req, path, sizeof(req.req));
664 	if (*tab->uri.query != '\0') {
665 		strlcat(req.req, "?", sizeof(req.req));
666 		strlcat(req.req, tab->uri.query, sizeof(req.req));
667 	}
668 	strlcat(req.req, "\r\n", sizeof(req.req));
669 
670 	return make_request(tab, &req, PROTO_GOPHER, NULL);
671 }
672 
673 static int
674 load_via_proxy(struct tab *tab, const char *url, struct proxy *p)
675 {
676 	struct get_req req;
677 
678 	memset(&req, 0, sizeof(req));
679 	strlcpy(req.host, p->host, sizeof(req.host));
680 	strlcpy(req.port, p->port, sizeof(req.host));
681 
682 	tab->proxy = p;
683 
684 	return make_request(tab, &req, p->proto, tab->hist_cur->h);
685 }
686 
687 static int
688 make_request(struct tab *tab, struct get_req *req, int proto, const char *r)
689 {
690 	stop_tab(tab);
691 	tab->id = tab_new_id();
692 	req->proto = proto;
693 
694 	if (r != NULL) {
695 		strlcpy(req->req, r, sizeof(req->req));
696 		strlcat(req->req, "\r\n", sizeof(req->req));
697 	}
698 
699 	ui_send_net(IMSG_GET_RAW, tab->id, req, sizeof(*req));
700 
701 	/*
702 	 * So the various load_*_url can `return make_request` and
703 	 * do_load_url is happy.
704 	 */
705 	return 1;
706 }
707 
708 static int
709 make_fs_request(struct tab *tab, int type, const char *r)
710 {
711 	stop_tab(tab);
712 	tab->id = tab_new_id();
713 
714 	ui_send_fs(type, tab->id, r, strlen(r)+1);
715 
716 	/*
717 	 * So load_{about,file}_url can `return make_fs_request` and
718 	 * do_load_url is happy.
719 	 */
720 	return 1;
721 }
722 
723 void
724 gopher_send_search_req(struct tab *tab, const char *text)
725 {
726 	struct get_req	req;
727 
728 	start_loading_anim(tab);
729 
730 	memset(&req, 0, sizeof(req));
731 	strlcpy(req.host, tab->uri.host, sizeof(req.host));
732 	strlcpy(req.port, tab->uri.port, sizeof(req.host));
733 
734 	/* +2 to skip /7 */
735 	strlcpy(req.req, tab->uri.path+2, sizeof(req.req));
736 	if (*tab->uri.query != '\0') {
737 		strlcat(req.req, "?", sizeof(req.req));
738 		strlcat(req.req, tab->uri.query, sizeof(req.req));
739 	}
740 
741 	strlcat(req.req, "\t", sizeof(req.req));
742 	strlcat(req.req, text, sizeof(req.req));
743 	strlcat(req.req, "\r\n", sizeof(req.req));
744 
745 	erase_buffer(&tab->buffer);
746 	parser_init(tab, gophermap_initparser);
747 
748 	make_request(tab, &req, PROTO_GOPHER, NULL);
749 }
750 
751 /*
752  * Effectively load the given url in the given tab.  Return 1 when
753  * loading the page asynchronously, and thus when an erase_buffer can
754  * be done right after this function return, or 0 when loading the
755  * page synchronously.  In this last case, erase_buffer *MUST* be
756  * called by the handling function (such as load_page_from_str).
757  */
758 static int
759 do_load_url(struct tab *tab, const char *url, const char *base)
760 {
761 	struct phos_uri	 uri;
762 	struct proto	*p;
763 	struct proxy	*proxy;
764 	char		*t;
765 
766 	tab->proxy = NULL;
767 
768 	if (tab->fd != -1) {
769 		close(tab->fd);
770 		tab->fd = -1;
771 		free(tab->path);
772 		tab->path = NULL;
773 	}
774 
775 	tab->trust = TS_UNKNOWN;
776 
777 	if (base == NULL)
778 		memcpy(&uri, &tab->uri, sizeof(tab->uri));
779 	else
780 		phos_parse_absolute_uri(base, &uri);
781 
782 	if (!phos_resolve_uri_from_str(&uri, url, &tab->uri)) {
783 		if (asprintf(&t, "#error loading %s\n>%s\n",
784 		    url, "Can't parse the URI") == -1)
785 			die();
786 		strlcpy(tab->hist_cur->h, url, sizeof(tab->hist_cur->h));
787 		load_page_from_str(tab, t);
788 		free(t);
789 		return 0;
790 	}
791 
792 	phos_serialize_uri(&tab->uri, tab->hist_cur->h,
793 	    sizeof(tab->hist_cur->h));
794 
795 	for (p = protos; p->schema != NULL; ++p) {
796 		if (!strcmp(tab->uri.scheme, p->schema)) {
797 			/* patch the port */
798 			if (*tab->uri.port == '\0' && p->port != NULL)
799 				strlcpy(tab->uri.port, p->port,
800 				    sizeof(tab->uri.port));
801 
802 			return p->loadfn(tab, url);
803 		}
804 	}
805 
806 	TAILQ_FOREACH(proxy, &proxies, proxies) {
807 		if (!strcmp(tab->uri.scheme, proxy->match_proto))
808 			return load_via_proxy(tab, url, proxy);
809 	}
810 
811 	return load_page_from_str(tab, err_pages[UNKNOWN_PROTOCOL]);
812 }
813 
814 /*
815  * Load url in tab.  If tab is marked as lazy, only prepare the url
816  * but don't load it.  If tab is lazy and a url was already prepared,
817  * do load it!
818  */
819 void
820 load_url(struct tab *tab, const char *url, const char *base, int nohist)
821 {
822 	int lazy;
823 
824 	lazy = tab->flags & TAB_LAZY;
825 
826 	if (lazy && tab->hist_cur != NULL) {
827 		lazy = 0;
828 		tab->flags &= ~TAB_LAZY;
829 	}
830 
831 	/* can't have both nohist and lazy at the same time. */
832 	if (nohist && lazy)
833 		nohist = 0;
834 
835 	if (!nohist && (!lazy || tab->hist_cur == NULL)) {
836 		if (tab->hist_cur != NULL)
837 			hist_clear_forward(&tab->hist,
838 			    TAILQ_NEXT(tab->hist_cur, entries));
839 
840 		if ((tab->hist_cur = calloc(1, sizeof(*tab->hist_cur))) == NULL) {
841 			event_loopbreak();
842 			return;
843 		}
844 
845 		strlcpy(tab->buffer.page.title, url,
846 		    sizeof(tab->buffer.page.title));
847 		hist_push(&tab->hist, tab->hist_cur);
848 
849 		if (lazy)
850 			strlcpy(tab->hist_cur->h, url,
851 			    sizeof(tab->hist_cur->h));
852 	}
853 
854 	if (!lazy && do_load_url(tab, url, base))
855 		erase_buffer(&tab->buffer);
856 }
857 
858 int
859 load_previous_page(struct tab *tab)
860 {
861 	struct hist	*h;
862 
863 	if ((h = TAILQ_PREV(tab->hist_cur, mhisthead, entries)) == NULL)
864 		return 0;
865 	tab->hist_cur = h;
866 	do_load_url(tab, h->h, NULL);
867 	return 1;
868 }
869 
870 int
871 load_next_page(struct tab *tab)
872 {
873 	struct hist	*h;
874 
875 	if ((h = TAILQ_NEXT(tab->hist_cur, entries)) == NULL)
876 		return 0;
877 	tab->hist_cur = h;
878 	do_load_url(tab, h->h, NULL);
879 	return 1;
880 }
881 
882 /*
883  * Free every resource linked to the tab, including the tab itself.
884  * Removes the tab from the tablist, but doesn't update the
885  * current_tab though.
886  */
887 void
888 free_tab(struct tab *tab)
889 {
890 	stop_tab(tab);
891 
892 	if (evtimer_pending(&tab->loadingev, NULL))
893 		evtimer_del(&tab->loadingev);
894 
895 	TAILQ_REMOVE(&tabshead, tab, tabs);
896 	free(tab);
897 }
898 
899 void
900 stop_tab(struct tab *tab)
901 {
902 	ui_send_net(IMSG_STOP, tab->id, NULL, 0);
903 
904 	if (tab->fd != -1) {
905 		close(tab->fd);
906 		tab->fd = -1;
907 		free(tab->path);
908 		tab->path = NULL;
909 		load_page_from_str(tab, "Stopped.\n");
910 	}
911 }
912 
913 void
914 add_to_bookmarks(const char *str)
915 {
916 	ui_send_fs(IMSG_BOOKMARK_PAGE, 0,
917 	    str, strlen(str)+1);
918 }
919 
920 void
921 save_session(void)
922 {
923 	struct tab	*tab;
924 	char		*t;
925 	int		 flags;
926 
927 	ui_send_fs(IMSG_SESSION_START, 0, NULL, 0);
928 
929 	TAILQ_FOREACH(tab, &tabshead, tabs) {
930 		flags = tab->flags;
931 		if (tab == current_tab)
932 			flags |= TAB_CURRENT;
933 
934 		t = tab->hist_cur->h;
935 		ui_send_fs(IMSG_SESSION_TAB, flags, t, strlen(t)+1);
936 
937 		t = tab->buffer.page.title;
938 		ui_send_fs(IMSG_SESSION_TAB_TITLE, 0, t, strlen(t)+1);
939 	}
940 
941 	ui_send_fs(IMSG_SESSION_END, 0, NULL, 0);
942 }
943 
944 /*
945  * Parse a line of the session file.  The format is:
946  *
947  *	URL [flags,...] [title]\n
948  */
949 static void
950 parse_session_line(char *line, const char **title, uint32_t *flags)
951 {
952 	char *s, *t, *ap;
953 
954 	*title = "";
955 	*flags = 0;
956 	if ((s = strchr(line, ' ')) == NULL)
957 		return;
958 
959 	*s++ = '\0';
960 
961         if ((t = strchr(s, ' ')) != NULL) {
962 		*t++ = '\0';
963 		*title = t;
964 	}
965 
966 	while ((ap = strsep(&s, ",")) != NULL) {
967 		if (*ap == '\0')
968 			;
969 		else if (!strcmp(ap, "current"))
970 			*flags |= TAB_CURRENT;
971 		else
972 			message("unknown tab flag: %s", ap);
973 	}
974 }
975 
976 static void
977 load_last_session(void)
978 {
979 	const char	*title;
980 	char		*nl, *line = NULL;
981 	uint32_t	 flags;
982 	size_t		 linesize = 0;
983 	ssize_t		 linelen;
984 	FILE		*session;
985 	struct tab	*tab, *curr = NULL;
986 
987 	if ((session = fopen(session_file, "r")) == NULL) {
988 		/* first time? */
989 		new_tab("about:new", NULL, NULL);
990 		switch_to_tab(new_tab("about:help", NULL, NULL));
991 		return;
992 	}
993 
994 	while ((linelen = getline(&line, &linesize, session)) != -1) {
995                 if ((nl = strchr(line, '\n')) != NULL)
996 			*nl = '\0';
997 		parse_session_line(line, &title, &flags);
998 		if ((tab = new_tab(line, NULL, NULL)) == NULL)
999 			err(1, "new_tab");
1000                 strlcpy(tab->buffer.page.title, title,
1001 		    sizeof(tab->buffer.page.title));
1002 		if (flags & TAB_CURRENT)
1003 			curr = tab;
1004 	}
1005 
1006 	if (ferror(session))
1007 		message("error reading %s: %s",
1008 		    session_file, strerror(errno));
1009 	fclose(session);
1010 	free(line);
1011 
1012 	if (curr != NULL)
1013 		switch_to_tab(curr);
1014 
1015 	if (last_time_crashed())
1016 		switch_to_tab(new_tab("about:crash", NULL, NULL));
1017 
1018 	return;
1019 }
1020 
1021 static pid_t
1022 start_child(enum telescope_process p, const char *argv0, int fd)
1023 {
1024 	const char	*argv[4];
1025 	int		 argc = 0;
1026 	pid_t		 pid;
1027 
1028 	switch (pid = fork()) {
1029 	case -1:
1030 		die();
1031 	case 0:
1032 		break;
1033 	default:
1034 		close(fd);
1035 		return pid;
1036 	}
1037 
1038 	if (dup2(fd, 3) == -1)
1039 		err(1, "cannot setup imsg fd");
1040 
1041 	argv[argc++] = argv0;
1042 	switch (p) {
1043 	case PROC_UI:
1044 		errx(1, "Can't start ui process");
1045 	case PROC_FS:
1046 		argv[argc++] = "-Tf";
1047 		break;
1048 	case PROC_NET:
1049 		argv[argc++] = "-Tn";
1050 		break;
1051 	}
1052 
1053 	argv[argc++] = NULL;
1054 	execvp(argv0, (char *const *)argv);
1055 	err(1, "execvp(%s)", argv0);
1056 }
1057 
1058 static int
1059 ui_send_net(int type, uint32_t peerid, const void *data,
1060     uint16_t datalen)
1061 {
1062 	return imsg_compose_event(iev_net, type, peerid, 0, -1, data,
1063 	    datalen);
1064 }
1065 
1066 static int
1067 ui_send_fs(int type, uint32_t peerid, const void *data, uint16_t datalen)
1068 {
1069 	return imsg_compose_event(iev_fs, type, peerid, 0, -1, data,
1070 	    datalen);
1071 }
1072 
1073 static void __attribute__((noreturn))
1074 usage(int r)
1075 {
1076 	fprintf(stderr, "USAGE: %s [-hnv] [-c config] [url]\n",
1077 	    getprogname());
1078 	fprintf(stderr, "version: " PACKAGE " " VERSION "\n");
1079 	exit(r);
1080 }
1081 
1082 int
1083 main(int argc, char * const *argv)
1084 {
1085 	struct imsgev	 net_ibuf, fs_ibuf;
1086 	int		 pipe2net[2], pipe2fs[2];
1087 	int		 ch, configtest = 0, fail = 0;
1088 	int		 has_url = 0;
1089 	int		 proc = -1;
1090 	int		 sessionfd;
1091 	char		 path[PATH_MAX];
1092 	const char	*url = NEW_TAB_URL;
1093 	const char	*argv0;
1094 
1095 	argv0 = argv[0];
1096 
1097 	signal(SIGCHLD, SIG_IGN);
1098 	signal(SIGPIPE, SIG_IGN);
1099 
1100 	if (getenv("NO_COLOR") != NULL)
1101 		enable_colors = 0;
1102 
1103 	strlcpy(path, getenv("HOME"), sizeof(path));
1104 	strlcat(path, "/.telescope/config", sizeof(path));
1105 
1106 	while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
1107 		switch (ch) {
1108 		case 'C':
1109 			exit(ui_print_colors());
1110 		case 'c':
1111 			fail = 1;
1112 			strlcpy(path, optarg, sizeof(path));
1113 			break;
1114 		case 'n':
1115 			configtest = 1;
1116 			break;
1117 		case 'h':
1118 			usage(0);
1119 		case 'T':
1120 			switch (*optarg) {
1121 			case 'f':
1122 				proc = PROC_FS;
1123 				break;
1124 			case 'n':
1125 				proc = PROC_NET;
1126 				break;
1127 			default:
1128 				errx(1, "invalid process spec %c",
1129 				    *optarg);
1130 			}
1131 			break;
1132 		case 'v':
1133 			printf("%s %s\n", PACKAGE_NAME, PACKAGE_VERSION);
1134 			exit(0);
1135 			break;
1136 		default:
1137 			usage(1);
1138 		}
1139 	}
1140 
1141 	argc -= optind;
1142 	argv += optind;
1143 
1144 	if (proc != -1) {
1145 		if (argc > 0)
1146 			usage(1);
1147 		else if (proc == PROC_FS)
1148 			return fs_main();
1149 		else if (proc == PROC_NET)
1150 			return net_main();
1151 		else
1152 			usage(1);
1153 	}
1154 
1155 	if (argc != 0) {
1156 		has_url = 1;
1157 		url = argv[0];
1158 	}
1159 
1160 	/* setup keys before reading the config */
1161 	TAILQ_INIT(&global_map.m);
1162 	global_map.unhandled_input = global_key_unbound;
1163 	TAILQ_INIT(&minibuffer_map.m);
1164 
1165 	config_init();
1166 	parseconfig(path, fail);
1167 	if (configtest){
1168 		puts("config OK");
1169 		exit(0);
1170 	}
1171 
1172 	fs_init();
1173 	if ((sessionfd = lock_session()) == -1)
1174 		errx(1, "can't lock session, is another instance of "
1175 		    "telescope already running?");
1176 
1177 	/* Start children. */
1178 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2fs) == -1)
1179 		err(1, "socketpair");
1180 	start_child(PROC_FS, argv0, pipe2fs[1]);
1181 	imsg_init(&fs_ibuf.ibuf, pipe2fs[0]);
1182 	iev_fs = &fs_ibuf;
1183 	iev_fs->handler = handle_dispatch_imsg;
1184 
1185 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe2net) == -1)
1186 		err(1, "socketpair");
1187 	start_child(PROC_NET, argv0, pipe2net[1]);
1188 	imsg_init(&net_ibuf.ibuf, pipe2net[0]);
1189 	iev_net = &net_ibuf;
1190 	iev_net->handler = handle_dispatch_imsg;
1191 
1192 	setproctitle("ui");
1193 
1194 	/* initialize tofu & load certificates */
1195 	tofu_init(&certs, 5, offsetof(struct tofu_entry, domain));
1196 	load_certs(&certs);
1197 
1198 	event_init();
1199 
1200 	/* Setup event handlers for pipes to fs/net */
1201 	iev_fs->events = EV_READ;
1202 	event_set(&iev_fs->ev, iev_fs->ibuf.fd, iev_fs->events,
1203 	    iev_fs->handler, iev_fs);
1204 	event_add(&iev_fs->ev, NULL);
1205 
1206 	iev_net->events = EV_READ;
1207 	event_set(&iev_net->ev, iev_net->ibuf.fd, iev_net->events,
1208 	    iev_net->handler, iev_net);
1209 	event_add(&iev_net->ev, NULL);
1210 
1211 	if (ui_init()) {
1212 		load_last_session();
1213 		if (has_url || TAILQ_EMPTY(&tabshead))
1214 			new_tab(url, NULL, NULL);
1215 
1216 		sandbox_ui_process();
1217 		ui_main_loop();
1218 		ui_end();
1219 	}
1220 
1221 	ui_send_fs(IMSG_QUIT, 0, NULL, 0);
1222 	ui_send_net(IMSG_QUIT, 0, NULL, 0);
1223 	imsg_flush(&iev_fs->ibuf);
1224 	imsg_flush(&iev_net->ibuf);
1225 
1226 	close(sessionfd);
1227 
1228 	return 0;
1229 }