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Date:: Thu Dec 30 17:27:36 2021 UTC
Message:: reuse struct session_tab when saving the session
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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 /*
18  * Handles config and runtime files
19  */
20 
21 #include "compat.h"
22 
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 
26 #include <dirent.h>
27 #include <errno.h>
28 #include <fcntl.h>
29 #include <limits.h>
30 #include <libgen.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <unistd.h>
35 
36 #include "fs.h"
37 #include "pages.h"
38 #include "telescope.h"
39 
40 static void		 die(void) __attribute__((__noreturn__));
41 static void		 send_file(uint32_t, FILE *);
42 static void		 handle_get(struct imsg*, size_t);
43 static int		 select_non_dot(const struct dirent *);
44 static int		 select_non_dotdot(const struct dirent *);
45 static void		 handle_get_file(struct imsg*, size_t);
46 static void		 handle_quit(struct imsg*, size_t);
47 static void		 handle_bookmark_page(struct imsg*, size_t);
48 static void		 handle_save_cert(struct imsg*, size_t);
49 static void		 handle_update_cert(struct imsg*, size_t);
50 static void		 handle_file_open(struct imsg*, size_t);
51 static void		 handle_session_start(struct imsg*, size_t);
52 static void		 handle_session_tab(struct imsg*, size_t);
53 static void		 handle_session_end(struct imsg*, size_t);
54 static void		 handle_dispatch_imsg(int, short, void*);
55 static int		 fs_send_ui(int, uint32_t, int, const void *, uint16_t);
56 static size_t		 join_path(char*, const char*, const char*, size_t);
57 static void		 getenv_default(char*, const char*, const char*, size_t);
58 static void		 mkdirs(const char*, mode_t);
59 static void		 xdg_init(void);
60 
61 static struct imsgev		*iev_ui;
62 static FILE			*session;
63 
64 /*
65  * Note: these are empty if ~/.telescope exists, use *_path_base
66  * below.
67  */
68 static char	xdg_config_base[PATH_MAX];
69 static char	xdg_data_base[PATH_MAX];
70 static char	xdg_cache_base[PATH_MAX];
71 
72 /*
73  * Where to store user data.  These are all equal to ~/.telescope if
74  * it exists.
75  */
76 char		config_path_base[PATH_MAX];
77 char		data_path_base[PATH_MAX];
78 char		cache_path_base[PATH_MAX];
79 
80 char		config_path[PATH_MAX];
81 char		lockfile_path[PATH_MAX];
82 char		bookmark_file[PATH_MAX];
83 char		known_hosts_file[PATH_MAX], known_hosts_tmp[PATH_MAX];
84 char		crashed_file[PATH_MAX];
85 char		session_file[PATH_MAX];
86 
87 static imsg_handlerfn *handlers[] = {
88 	[IMSG_GET] = handle_get,
89 	[IMSG_GET_FILE] = handle_get_file,
90 	[IMSG_QUIT] = handle_quit,
91 	[IMSG_BOOKMARK_PAGE] = handle_bookmark_page,
92 	[IMSG_SAVE_CERT] = handle_save_cert,
93 	[IMSG_UPDATE_CERT] = handle_update_cert,
94 	[IMSG_FILE_OPEN] = handle_file_open,
95 	[IMSG_SESSION_START] = handle_session_start,
96 	[IMSG_SESSION_TAB] = handle_session_tab,
97 	[IMSG_SESSION_END] = handle_session_end,
98 };
99 
100 static void __attribute__((__noreturn__))
101 die(void)
102 {
103 	abort(); 		/* TODO */
104 }
105 
106 static void
107 send_file(uint32_t peerid, FILE *f)
108 {
109 	ssize_t	 r;
110 	char	 buf[BUFSIZ];
111 
112 	for (;;) {
113 		r = fread(buf, 1, sizeof(buf), f);
114 		if (r != 0)
115 			fs_send_ui(IMSG_BUF, peerid, -1, buf, r);
116 		if (r != sizeof(buf))
117 			break;
118 	}
119 	fs_send_ui(IMSG_EOF, peerid, -1, NULL, 0);
120 	fclose(f);
121 }
122 
123 static void
124 handle_get(struct imsg *imsg, size_t datalen)
125 {
126 	const char	*bpath = "bookmarks.gmi";
127 	char		 path[PATH_MAX];
128 	FILE		*f;
129 	const char	*data, *p;
130 	size_t		 i;
131 	struct page {
132 		const char	*name;
133 		const char	*path;
134 		const uint8_t	*data;
135 		size_t		 len;
136 	} pages[] = {
137 		{"about",	NULL,	about_about,	about_about_len},
138 		{"blank",	NULL,	about_blank,	about_blank_len},
139 		{"bookmarks",	bpath,	bookmarks,	bookmarks_len},
140 		{"crash",	NULL,	about_crash,	about_crash_len},
141 		{"help",	NULL,	about_help,	about_help_len},
142 		{"license",	NULL,	about_license,	about_license_len},
143 		{"new",		NULL,	about_new,	about_new_len},
144 	}, *page = NULL;
145 
146 	data = imsg->data;
147 	if (data[datalen-1] != '\0') /* make sure it's NUL-terminated */
148 		die();
149 	if ((data = strchr(data, ':')) == NULL)
150 		goto notfound;
151 	data++;
152 
153 	for (i = 0; i < sizeof(pages)/sizeof(pages[0]); ++i)
154 		if (!strcmp(data, pages[i].name)) {
155 			page = &pages[i];
156 			break;
157 		}
158 
159 	if (page == NULL)
160 		goto notfound;
161 
162 	strlcpy(path, data_path_base, sizeof(path));
163 	strlcat(path, "/", sizeof(path));
164 	if (page->path != NULL)
165 		strlcat(path, page->path, sizeof(path));
166 	else {
167 		strlcat(path, "pages/about_", sizeof(path));
168 		strlcat(path, page->name, sizeof(path));
169 		strlcat(path, ".gmi", sizeof(path));
170 	}
171 
172 	if ((f = fopen(path, "r")) == NULL) {
173 		fs_send_ui(IMSG_BUF, imsg->hdr.peerid, -1,
174 		    page->data, page->len);
175 		fs_send_ui(IMSG_EOF, imsg->hdr.peerid, -1,
176 		    NULL, 0);
177 		return;
178 	}
179 
180 	send_file(imsg->hdr.peerid, f);
181 	return;
182 
183 notfound:
184 	p = "# not found!\n";
185 	fs_send_ui(IMSG_BUF, imsg->hdr.peerid, -1, p, strlen(p));
186 	fs_send_ui(IMSG_EOF, imsg->hdr.peerid, -1, NULL, 0);
187 }
188 
189 static inline void
190 send_hdr(uint32_t peerid, int code, const char *meta)
191 {
192 	fs_send_ui(IMSG_GOT_CODE, peerid, -1, &code, sizeof(code));
193 	fs_send_ui(IMSG_GOT_META, peerid, -1, meta, strlen(meta)+1);
194 }
195 
196 static inline void
197 send_errno(uint32_t peerid, int code, const char *str, int no)
198 {
199 	char *s;
200 
201 	if (asprintf(&s, "%s: %s", str, strerror(no)) == -1)
202 		s = NULL;
203 
204 	send_hdr(peerid, code, s == NULL ? str : s);
205 	free(s);
206 }
207 
208 static inline const char *
209 file_type(const char *path)
210 {
211 	struct mapping {
212 		const char	*ext;
213 		const char	*mime;
214 	} ms[] = {
215 		{"diff",	"text/x-patch"},
216 		{"gemini",	"text/gemini"},
217 		{"gmi",		"text/gemini"},
218 		{"markdown",	"text/plain"},
219 		{"md",		"text/plain"},
220 		{"patch",	"text/x-patch"},
221 		{"txt",		"text/plain"},
222 		{NULL, NULL},
223 	}, *m;
224 	char *dot;
225 
226 	if ((dot = strrchr(path, '.')) == NULL)
227 		return NULL;
228 
229 	dot++;
230 
231 	for (m = ms; m->ext != NULL; ++m)
232 		if (!strcmp(m->ext, dot))
233 			return m->mime;
234 
235 	return NULL;
236 }
237 
238 static int
239 select_non_dot(const struct dirent *d)
240 {
241 	return strcmp(d->d_name, ".");
242 }
243 
244 static int
245 select_non_dotdot(const struct dirent *d)
246 {
247 	return strcmp(d->d_name, ".") && strcmp(d->d_name, "..");
248 }
249 
250 static inline void
251 send_dir(uint32_t peerid, const char *path)
252 {
253 	struct dirent	**names;
254 	struct evbuffer	 *ev;
255 	char		 *s;
256 	int		(*selector)(const struct dirent *) = select_non_dot;
257 	int		  i, len, no;
258 
259 	if (!has_suffix(path, "/")) {
260 		if (asprintf(&s, "%s/", path) == -1)
261 			die();
262 		send_hdr(peerid, 30, s);
263 		free(s);
264 		return;
265 	}
266 
267 	if (!strcmp(path, "/"))
268 		selector = select_non_dotdot;
269 
270 	if ((ev = evbuffer_new()) == NULL ||
271 	    (len = scandir(path, &names, selector, alphasort)) == -1) {
272 		no = errno;
273 		evbuffer_free(ev);
274 		send_errno(peerid, 40, "failure reading the directory", no);
275 		return;
276 	}
277 
278 	evbuffer_add_printf(ev, "# Index of %s\n\n", path);
279 	for (i = 0; i < len; ++i) {
280 		evbuffer_add_printf(ev, "=> %s", names[i]->d_name);
281 		if (names[i]->d_type == DT_DIR)
282 			evbuffer_add(ev, "/", 1);
283 		evbuffer_add(ev, "\n", 1);
284 	}
285 
286 	send_hdr(peerid, 20, "text/gemini");
287 	fs_send_ui(IMSG_BUF, peerid, -1,
288 	    EVBUFFER_DATA(ev), EVBUFFER_LENGTH(ev));
289 	fs_send_ui(IMSG_EOF, peerid, -1, NULL, 0);
290 
291 	evbuffer_free(ev);
292 	free(names);
293 }
294 
295 static void
296 handle_get_file(struct imsg *imsg, size_t datalen)
297 {
298 	struct stat	 sb;
299 	FILE		*f;
300 	char		*data;
301 	const char	*meta = NULL;
302 
303 	data = imsg->data;
304 	data[datalen-1] = '\0';
305 
306 	if ((f = fopen(data, "r")) == NULL) {
307 		send_errno(imsg->hdr.peerid, 51, "can't open", errno);
308 		return;
309 	}
310 
311 	if (fstat(fileno(f), &sb) == -1) {
312 		send_errno(imsg->hdr.peerid, 40, "fstat", errno);
313 		return;
314 	}
315 
316 	if (S_ISDIR(sb.st_mode)) {
317 		fclose(f);
318 		send_dir(imsg->hdr.peerid, data);
319 		return;
320 	}
321 
322 	if ((meta = file_type(data)) == NULL) {
323 		fclose(f);
324 		send_hdr(imsg->hdr.peerid, 51,
325 		    "don't know how to visualize this file");
326 		return;
327 	}
328 
329 	send_hdr(imsg->hdr.peerid, 20, meta);
330 	send_file(imsg->hdr.peerid, f);
331 }
332 
333 static void
334 handle_quit(struct imsg *imsg, size_t datalen)
335 {
336 	if (!safe_mode)
337 		unlink(crashed_file);
338 
339 	event_loopbreak();
340 }
341 
342 static void
343 handle_bookmark_page(struct imsg *imsg, size_t datalen)
344 {
345 	char	*data;
346 	int	 res;
347 	FILE	*f;
348 
349 	data = imsg->data;
350 	if (data[datalen-1] != '\0')
351 		die();
352 
353 	if ((f = fopen(bookmark_file, "a")) == NULL) {
354 		res = errno;
355 		goto end;
356 	}
357 	fprintf(f, "=> %s\n", data);
358 	fclose(f);
359 
360 	res = 0;
361 end:
362 	fs_send_ui(IMSG_BOOKMARK_OK, 0, -1, &res, sizeof(res));
363 }
364 
365 static void
366 handle_save_cert(struct imsg *imsg, size_t datalen)
367 {
368 	struct tofu_entry	 e;
369 	FILE			*f;
370 	int			 res;
371 
372 	/* TODO: traverse the file to avoid duplications? */
373 
374 	if (datalen != sizeof(e))
375 		die();
376 	memcpy(&e, imsg->data, datalen);
377 
378 	if ((f = fopen(known_hosts_file, "a")) == NULL) {
379 		res = errno;
380 		goto end;
381 	}
382 	fprintf(f, "%s %s %d\n", e.domain, e.hash, e.verified);
383 	fclose(f);
384 
385 	res = 0;
386 end:
387 	fs_send_ui(IMSG_SAVE_CERT_OK, imsg->hdr.peerid, -1,
388 	    &res, sizeof(res));
389 }
390 
391 static void
392 handle_update_cert(struct imsg *imsg, size_t datalen)
393 {
394 	FILE	*tmp, *f;
395 	struct	 tofu_entry entry;
396 	char	 sfn[PATH_MAX], *line = NULL, *t;
397 	size_t	 l, linesize = 0;
398 	ssize_t	 linelen;
399 	int	 fd, e, res = 0;
400 
401 	if (datalen != sizeof(entry))
402 		die();
403 	memcpy(&entry, imsg->data, datalen);
404 
405 	strlcpy(sfn, known_hosts_tmp, sizeof(sfn));
406 	if ((fd = mkstemp(sfn)) == -1 ||
407 	    (tmp = fdopen(fd, "w")) == NULL) {
408 		if (fd != -1) {
409 			unlink(sfn);
410 			close(fd);
411 		}
412 		res = 0;
413 		goto end;
414 	}
415 
416 	if ((f = fopen(known_hosts_file, "r")) == NULL) {
417 		unlink(sfn);
418 		fclose(tmp);
419                 res = 0;
420 		goto end;
421 	}
422 
423 	l = strlen(entry.domain);
424 	while ((linelen = getline(&line, &linesize, f)) != -1) {
425 		if ((t = strstr(line, entry.domain)) != NULL &&
426 		    (line[l] == ' ' || line[l] == '\t'))
427 			continue;
428 		/* line has a trailing \n */
429 		fprintf(tmp, "%s", line);
430 	}
431 	fprintf(tmp, "%s %s %d\n", entry.domain, entry.hash, entry.verified);
432 
433 	free(line);
434 	e = ferror(tmp);
435 
436 	fclose(tmp);
437 	fclose(f);
438 
439 	if (e) {
440 		unlink(sfn);
441 		res = 0;
442 		goto end;
443 	}
444 
445 	res = rename(sfn, known_hosts_file) != -1;
446 
447 end:
448 	fs_send_ui(IMSG_UPDATE_CERT_OK, imsg->hdr.peerid, -1,
449 	    &res, sizeof(res));
450 }
451 
452 static void
453 handle_file_open(struct imsg *imsg, size_t datalen)
454 {
455 	char	*path, *e;
456 	int	 fd;
457 
458 	path = imsg->data;
459 	if (path[datalen-1] != '\0')
460 		die();
461 
462 	if ((fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0644)) == -1) {
463 		e = strerror(errno);
464 		fs_send_ui(IMSG_FILE_OPENED, imsg->hdr.peerid, -1,
465 		    e, strlen(e)+1);
466 	} else
467 		fs_send_ui(IMSG_FILE_OPENED, imsg->hdr.peerid, fd,
468 		    NULL, 0);
469 }
470 
471 static void
472 handle_session_start(struct imsg *imsg, size_t datalen)
473 {
474 	if (datalen != 0)
475 		die();
476 
477 	if ((session = fopen(session_file, "w")) == NULL)
478 		die();
479 }
480 
481 static void
482 handle_session_tab(struct imsg *imsg, size_t datalen)
483 {
484 	struct session_tab	tab;
485 
486 	if (session == NULL)
487 		die();
488 
489 	if (datalen != sizeof(tab))
490 		die();
491 
492 	memcpy(&tab, imsg->data, sizeof(tab));
493 	if (tab.uri[sizeof(tab.uri)-1] != '\0' ||
494 	    tab.title[sizeof(tab.title)-1] != '\0')
495 		die();
496 
497 	fprintf(session, "%s", tab.uri);
498 
499 	if (tab.flags & TAB_CURRENT)
500 		fprintf(session, " current ");
501 	else
502 		fprintf(session, " - ");
503 
504 	fprintf(session, "%s\n", tab.title);
505 }
506 
507 static void
508 handle_session_end(struct imsg *imsg, size_t datalen)
509 {
510 	if (session == NULL)
511 		die();
512 	fclose(session);
513 	session = NULL;
514 }
515 
516 static void
517 handle_dispatch_imsg(int fd, short ev, void *d)
518 {
519 	struct imsgev	*iev = d;
520 	int		 e;
521 
522 	if (dispatch_imsg(iev, ev, handlers, sizeof(handlers)) == -1) {
523 		/*
524 		 * This should leave a ~/.cache/telescope/crashed file to
525 		 * trigger about:crash on next run.  Unfortunately, if
526 		 * the main process dies the fs sticks around and
527 		 * doesn't notice that the fd was closed.  Why EV_READ
528 		 * is not triggered when a fd is closed on the other end?
529 		 */
530 		e = errno;
531 		if ((fd = open(crashed_file, O_CREAT|O_TRUNC|O_WRONLY, 0600))
532 		    == -1)
533 			err(1, "open");
534 		close(fd);
535 		errx(1, "connection closed: %s", strerror(e));
536 	}
537 }
538 
539 static int
540 fs_send_ui(int type, uint32_t peerid, int fd, const void *data,
541     uint16_t datalen)
542 {
543 	return imsg_compose_event(iev_ui, type, peerid, 0, fd,
544 	    data, datalen);
545 }
546 
547 static size_t
548 join_path(char *buf, const char *lhs, const char *rhs, size_t buflen)
549 {
550 	strlcpy(buf, lhs, buflen);
551 	return strlcat(buf, rhs, buflen);
552 }
553 
554 static void
555 getenv_default(char *buf, const char *name, const char *def, size_t buflen)
556 {
557 	size_t ret;
558 	char *home, *env;
559 
560 	if ((home = getenv("HOME")) == NULL)
561 		errx(1, "HOME is not defined");
562 
563 	if ((env = getenv(name)) != NULL)
564 		ret = strlcpy(buf, env, buflen);
565 	else
566 		ret = join_path(buf, home, def, buflen);
567 
568 	if (ret >= buflen)
569 		errx(1, "buffer too small for %s", name);
570 }
571 
572 static void
573 mkdirs(const char *path, mode_t mode)
574 {
575 	char copy[PATH_MAX+1], orig[PATH_MAX+1], *parent;
576 
577 	strlcpy(copy, path, sizeof(copy));
578 	strlcpy(orig, path, sizeof(orig));
579 	parent = dirname(copy);
580 	if (!strcmp(parent, "/"))
581 		return;
582 	mkdirs(parent, mode);
583 
584 	if (mkdir(orig, mode) != 0) {
585 		if (errno == EEXIST)
586 			return;
587 		err(1, "can't mkdir %s", orig);
588 	}
589 }
590 
591 static void
592 xdg_init(void)
593 {
594 	char *home, old_path[PATH_MAX];
595 	struct stat info;
596 
597 	/* old path */
598 	if ((home = getenv("HOME")) == NULL)
599 		errx(1, "HOME is not defined");
600 	join_path(old_path, home, "/.telescope", sizeof(old_path));
601 
602 	/* if ~/.telescope exists, use that instead of xdg dirs */
603 	if (stat(old_path, &info) == 0 && S_ISDIR(info.st_mode)) {
604 		join_path(config_path_base, home, "/.telescope",
605 		    sizeof(config_path_base));
606 		join_path(data_path_base, home, "/.telescope",
607 		    sizeof(data_path_base));
608 		join_path(cache_path_base, home, "/.telescope",
609 		    sizeof(cache_path_base));
610 		return;
611 	}
612 
613 	/* xdg paths */
614 	getenv_default(xdg_config_base, "XDG_CONFIG_HOME", "/.config",
615 	    sizeof(xdg_config_base));
616 	getenv_default(xdg_data_base, "XDG_DATA_HOME", "/.local/share",
617 	    sizeof(xdg_data_base));
618 	getenv_default(xdg_cache_base, "XDG_CACHE_HOME", "/.cache",
619 	    sizeof(xdg_cache_base));
620 
621 	join_path(config_path_base, xdg_config_base, "/telescope",
622 	    sizeof(config_path_base));
623 	join_path(data_path_base, xdg_data_base, "/telescope",
624 	    sizeof(data_path_base));
625 	join_path(cache_path_base, xdg_cache_base, "/telescope",
626 	    sizeof(cache_path_base));
627 
628 	mkdirs(xdg_config_base, S_IRWXU);
629 	mkdirs(xdg_data_base, S_IRWXU);
630 	mkdirs(xdg_cache_base, S_IRWXU);
631 
632 	mkdirs(config_path_base, S_IRWXU);
633 	mkdirs(data_path_base, S_IRWXU);
634 	mkdirs(cache_path_base, S_IRWXU);
635 }
636 
637 int
638 fs_init(void)
639 {
640 	xdg_init();
641 
642 	join_path(config_path, config_path_base, "/config",
643 	    sizeof(config_path));
644 	join_path(lockfile_path, cache_path_base, "/lock",
645 	    sizeof(lockfile_path));
646 	join_path(bookmark_file, data_path_base, "/bookmarks.gmi",
647 	    sizeof(bookmark_file));
648 	join_path(known_hosts_file, data_path_base, "/known_hosts",
649 	    sizeof(known_hosts_file));
650 	join_path(known_hosts_tmp, cache_path_base,
651 	    "/known_hosts.tmp.XXXXXXXXXX", sizeof(known_hosts_tmp));
652 	join_path(session_file, cache_path_base, "/session",
653 	    sizeof(session_file));
654 	join_path(crashed_file, cache_path_base, "/crashed",
655 	    sizeof(crashed_file));
656 
657 	return 1;
658 }
659 
660 /*
661  * Parse a line of the session file.  The format is:
662  *
663  *	URL [flags,...] [title]\n
664  */
665 static void
666 parse_session_line(char *line, const char **title, uint32_t *flags)
667 {
668 	char *s, *t, *ap;
669 
670 	*title = "";
671 	*flags = 0;
672 	if ((s = strchr(line, ' ')) == NULL)
673 		return;
674 
675 	*s++ = '\0';
676 
677 	if ((t = strchr(s, ' ')) != NULL) {
678 		*t++ = '\0';
679 		*title = t;
680 	}
681 
682 	while ((ap = strsep(&s, ",")) != NULL) {
683 		if (!strcmp(ap, "current"))
684 			*flags |= TAB_CURRENT;
685 	}
686 }
687 
688 static inline void
689 sendtab(uint32_t flags, const char *uri, const char *title)
690 {
691 	struct session_tab tab;
692 
693 	memset(&tab, 0, sizeof(tab));
694 	tab.flags = flags;
695 
696 	if (strlcpy(tab.uri, uri, sizeof(tab.uri)) >= sizeof(tab.uri))
697 		return;
698 
699 	/* don't worry about cached title truncation */
700 	if (title != NULL)
701 		strlcpy(tab.title, title, sizeof(tab.title));
702 
703 	fs_send_ui(IMSG_SESSION_TAB, 0, -1, &tab, sizeof(tab));
704 }
705 
706 static void
707 load_last_session(int fd, short event, void *d)
708 {
709 	FILE		*session;
710 	uint32_t	 flags;
711 	size_t		 linesize = 0;
712 	ssize_t		 linelen;
713 	int		 first_time = 0;
714 	const char	*title;
715 	char		*nl, *line = NULL;
716 
717 	if ((session = fopen(session_file, "r")) == NULL) {
718 		/* first time? */
719 		first_time = 1;
720 		goto end;
721 	}
722 
723 	while ((linelen = getline(&line, &linesize, session)) != -1) {
724 		if ((nl = strchr(line, '\n')) != NULL)
725 			*nl = '\0';
726 		parse_session_line(line, &title, &flags);
727 		sendtab(flags, line, title);
728 	}
729 
730 	fclose(session);
731 	free(line);
732 
733 	if (last_time_crashed())
734 		sendtab(TAB_CURRENT, "about:crash", NULL);
735 
736 end:
737 	fs_send_ui(IMSG_SESSION_END, 0, -1, &first_time, sizeof(first_time));
738 }
739 
740 int
741 fs_main(void)
742 {
743 	struct event ev;
744 	struct timeval t = {0, 0};
745 
746 	setproctitle("fs");
747 
748 	fs_init();
749 
750 	event_init();
751 
752 	/* Setup pipe and event handler to the main process */
753 	if ((iev_ui = malloc(sizeof(*iev_ui))) == NULL)
754 		die();
755 	imsg_init(&iev_ui->ibuf, 3);
756 	iev_ui->handler = handle_dispatch_imsg;
757 	iev_ui->events = EV_READ;
758 	event_set(&iev_ui->ev, iev_ui->ibuf.fd, iev_ui->events,
759 	    iev_ui->handler, iev_ui);
760 	event_add(&iev_ui->ev, NULL);
761 
762 	sandbox_fs_process();
763 
764 	/*
765 	 * Run load_last_session during the event loop, as soon as
766 	 * possible; it uses fs_send_ui so it can't be ran outside
767 	 * of event_dispatch.
768 	 */
769 	evtimer_set(&ev, load_last_session, NULL);
770 	evtimer_add(&ev, &t);
771 
772 	event_dispatch();
773 	return 0;
774 }
775 
776 
777 
778 /*
779  * Check if the last time telescope crashed.  The check is done by
780  * looking at `crashed_file': if it exists then last time we crashed.
781  * Then, while here, touch the file too.  During IMSG_QUIT we'll
782  * remove it.
783  */
784 int
785 last_time_crashed(void)
786 {
787 	int fd, crashed = 1;
788 
789 	if (safe_mode)
790 		return 0;
791 
792 	if (unlink(crashed_file) == -1 && errno == ENOENT)
793 		crashed = 0;
794 
795 	if ((fd = open(crashed_file, O_CREAT|O_WRONLY, 0600)) == -1)
796 		return crashed;
797 	close(fd);
798 
799 	return crashed;
800 }
801 
802 int
803 lock_session(void)
804 {
805 	struct flock	lock;
806 	int		fd;
807 
808 	if ((fd = open(lockfile_path, O_WRONLY|O_CREAT, 0600)) == -1)
809 		return -1;
810 
811 	lock.l_start = 0;
812 	lock.l_len = 0;
813 	lock.l_type = F_WRLCK;
814 	lock.l_whence = SEEK_SET;
815 
816 	if (fcntl(fd, F_SETLK, &lock) == -1) {
817 		close(fd);
818 		return -1;
819 	}
820 
821 	return fd;
822 }
823 
824 static int
825 parse_khost_line(char *line, char *tmp[3])
826 {
827 	char **ap;
828 
829 	for (ap = tmp; ap < &tmp[3] &&
830 	    (*ap = strsep(&line, " \t\n")) != NULL;) {
831 		if (**ap != '\0')
832 			ap++;
833 	}
834 
835 	return ap == &tmp[3] && *line == '\0';
836 }
837 
838 int
839 load_certs(struct ohash *h)
840 {
841 	char		*tmp[3], *line = NULL;
842 	const char	*errstr;
843 	size_t		 lineno = 0, linesize = 0;
844 	ssize_t		 linelen;
845 	FILE		*f;
846 	struct tofu_entry *e;
847 
848 	if ((f = fopen(known_hosts_file, "r")) == NULL)
849 		return 0;
850 
851 	while ((linelen = getline(&line, &linesize, f)) != -1) {
852 		if ((e = calloc(1, sizeof(*e))) == NULL)
853 			abort();
854 
855 		lineno++;
856 
857 		if (parse_khost_line(line, tmp)) {
858 			strlcpy(e->domain, tmp[0], sizeof(e->domain));
859 			strlcpy(e->hash, tmp[1], sizeof(e->hash));
860 
861 			e->verified = strtonum(tmp[2], 0, 1, &errstr);
862 			if (errstr != NULL)
863 				errx(1, "%s:%zu verification for %s is %s: %s",
864 				    known_hosts_file, lineno,
865 				    e->domain, errstr, tmp[2]);
866 			tofu_add(h, e);
867 		} else {
868 			warnx("%s:%zu invalid entry",
869 			    known_hosts_file, lineno);
870 			free(e);
871 		}
872 	}
873 
874 	free(line);
875 	return ferror(f);
876 }
877