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 the data in ~/.telescope
19  */
20 
21 #include "telescope.h"
22 
23 #include <errno.h>
24 #include <limits.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <unistd.h>
29 
30 static void		 die(void) __attribute__((__noreturn__));
31 static void		 serve_bookmarks(uint32_t);
32 static void		 handle_get(struct imsg*, size_t);
33 static void		 handle_quit(struct imsg*, size_t);
34 static void		 handle_bookmark_page(struct imsg*, size_t);
35 static void		 handle_dispatch_imsg(int, short, void*);
36 
37 static struct event		 imsgev;
38 static struct imsgbuf		*ibuf;
39 
40 static char	bookmark_file[PATH_MAX];
41 
42 static imsg_handlerfn *handlers[] = {
43 	[IMSG_GET] = handle_get,
44 	[IMSG_QUIT] = handle_quit,
45 	[IMSG_BOOKMARK_PAGE] = handle_bookmark_page,
46 };
47 
48 static void __attribute__((__noreturn__))
49 die(void)
50 {
51 	abort(); 		/* TODO */
52 }
53 
54 static void
55 serve_bookmarks(uint32_t peerid)
56 {
57 	const char	*t;
58 	char		 buf[BUFSIZ];
59 	size_t		 r;
60 	FILE		*f;
61 
62 	if ((f = fopen(bookmark_file, "r")) == NULL) {
63 		t = "# error\n\nCan't open bookmarks\n";
64 		imsg_compose(ibuf, IMSG_BUF, peerid, 0, -1, t, strlen(t));
65 		imsg_compose(ibuf, IMSG_EOF, peerid, 0, -1, NULL, 0);
66 		imsg_flush(ibuf);
67 		return;
68 	}
69 
70 	for (;;) {
71 		r = fread(buf, 1, sizeof(buf), f);
72 		imsg_compose(ibuf, IMSG_BUF, peerid, 0, -1, buf, r);
73 		imsg_flush(ibuf);
74 		if (r != sizeof(buf))
75 			break;
76 	}
77 
78 	imsg_compose(ibuf, IMSG_EOF, peerid, 0, -1, NULL, 0);
79 	imsg_flush(ibuf);
80 
81 	fclose(f);
82 }
83 
84 static void
85 handle_get(struct imsg *imsg, size_t datalen)
86 {
87 	char		*data;
88 	const char	*p;
89 
90 	data = imsg->data;
91 
92 	if (data[datalen-1] != '\0')
93 		die();
94 
95 	if (!strcmp(data, "about:new")) {
96 		imsg_compose(ibuf, IMSG_BUF, imsg->hdr.peerid, 0, -1,
97 		    about_new, strlen(about_new));
98 		imsg_compose(ibuf, IMSG_EOF, imsg->hdr.peerid, 0, -1, NULL, 0);
99 		imsg_flush(ibuf);
100 	} else if (!strcmp(data, "about:bookmarks")) {
101 		serve_bookmarks(imsg->hdr.peerid);
102 	} else {
103 		p = "# not found!\n";
104 		imsg_compose(ibuf, IMSG_BUF, imsg->hdr.peerid, 0, -1, p, strlen(p));
105 		imsg_compose(ibuf, IMSG_EOF, imsg->hdr.peerid, 0, -1, NULL, 0);
106 		imsg_flush(ibuf);
107 	}
108 }
109 
110 static void
111 handle_quit(struct imsg *imsg, size_t datalen)
112 {
113 	event_loopbreak();
114 }
115 
116 static void
117 handle_bookmark_page(struct imsg *imsg, size_t datalen)
118 {
119 	char	*data;
120 	int	 res;
121 	FILE	*f;
122 
123 	data = imsg->data;
124 	if (data[datalen-1] != '\0')
125 		die();
126 
127 	if ((f = fopen(bookmark_file, "a")) == NULL) {
128 		res = errno;
129 		goto end;
130 	}
131 	fprintf(f, "=> %s\n", data);
132 	fclose(f);
133 
134 	res = 0;
135 end:
136 	imsg_compose(ibuf, IMSG_BOOKMARK_OK, 0, 0, -1, &res, sizeof(res));
137 	imsg_flush(ibuf);
138 }
139 
140 static void
141 handle_dispatch_imsg(int fd, short ev, void *d)
142 {
143 	struct imsgbuf	*ibuf = d;
144 	dispatch_imsg(ibuf, handlers, sizeof(handlers));
145 }
146 
147 int
148 fs_main(struct imsgbuf *b)
149 {
150 	ibuf = b;
151 
152 	strlcpy(bookmark_file, getenv("HOME"), sizeof(bookmark_file));
153 	strlcat(bookmark_file, "/.telescope/bookmarks.gmi", sizeof(bookmark_file));
154 
155 	event_init();
156 
157 	event_set(&imsgev, ibuf->fd, EV_READ | EV_PERSIST, handle_dispatch_imsg, ibuf);
158 	event_add(&imsgev, NULL);
159 
160 	sandbox_fs_process();
161 
162 	event_dispatch();
163 	return 0;
164 }