1 /*
2 * Gopher protocol
3 *
4 * Copyright (c) 2009 Toshimitsu Kimura
5 * Copyright (c) 2021 parazyd <parazyd@dyne.org>
6 *
7 * based on libavformat/http.c, Copyright (c) 2000, 2001 Fabrice Bellard
8 *
9 * This file is part of FFmpeg.
10 *
11 * FFmpeg is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
15 *
16 * FFmpeg is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with FFmpeg; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26 #include "config.h"
27
28 #include "libavutil/avstring.h"
29 #include "avformat.h"
30 #include "internal.h"
31 #include "network.h"
32 #include "url.h"
33
34 typedef struct GopherContext {
35 URLContext *hd;
36 } GopherContext;
37
gopher_write(URLContext * h,const uint8_t * buf,int size)38 static int gopher_write(URLContext *h, const uint8_t *buf, int size)
39 {
40 GopherContext *s = h->priv_data;
41 return ffurl_write(s->hd, buf, size);
42 }
43
gopher_connect(URLContext * h,const char * path)44 static int gopher_connect(URLContext *h, const char *path)
45 {
46 char buffer[1024];
47
48 if (!*path) return AVERROR(EINVAL);
49 switch (*++path) {
50 case '5':
51 case '9':
52 path = strchr(path, '/');
53 if (!path) return AVERROR(EINVAL);
54 break;
55 default:
56 av_log(h, AV_LOG_WARNING,
57 "Gopher protocol type '%c' not supported yet!\n",
58 *path);
59 return AVERROR(EINVAL);
60 }
61
62 /* send gopher sector */
63 snprintf(buffer, sizeof(buffer), "%s\r\n", path);
64
65 if (gopher_write(h, buffer, strlen(buffer)) < 0)
66 return AVERROR(EIO);
67
68 return 0;
69 }
70
gopher_close(URLContext * h)71 static int gopher_close(URLContext *h)
72 {
73 GopherContext *s = h->priv_data;
74 ffurl_closep(&s->hd);
75 return 0;
76 }
77
gopher_open(URLContext * h,const char * uri,int flags)78 static int gopher_open(URLContext *h, const char *uri, int flags)
79 {
80 GopherContext *s = h->priv_data;
81 char proto[10], hostname[1024], auth[1024], path[1024], buf[1024];
82 int port, err;
83 const char *lower_proto = "tcp";
84
85 h->is_streamed = 1;
86
87 /* needed in any case to build the host string */
88 av_url_split(proto, sizeof(proto), auth, sizeof(auth),
89 hostname, sizeof(hostname), &port, path, sizeof(path), uri);
90
91 if (port < 0)
92 port = 70;
93
94 if (!strcmp(proto, "gophers"))
95 lower_proto = "tls";
96
97 ff_url_join(buf, sizeof(buf), lower_proto, NULL, hostname, port, NULL);
98
99 s->hd = NULL;
100 err = ffurl_open_whitelist(&s->hd, buf, AVIO_FLAG_READ_WRITE,
101 &h->interrupt_callback, NULL, h->protocol_whitelist, h->protocol_blacklist, h);
102 if (err < 0)
103 goto fail;
104
105 if ((err = gopher_connect(h, path)) < 0)
106 goto fail;
107 return 0;
108 fail:
109 gopher_close(h);
110 return err;
111 }
112
gopher_read(URLContext * h,uint8_t * buf,int size)113 static int gopher_read(URLContext *h, uint8_t *buf, int size)
114 {
115 GopherContext *s = h->priv_data;
116 int len = ffurl_read(s->hd, buf, size);
117 return len;
118 }
119
120 #if CONFIG_GOPHER_PROTOCOL
121 const URLProtocol ff_gopher_protocol = {
122 .name = "gopher",
123 .url_open = gopher_open,
124 .url_read = gopher_read,
125 .url_write = gopher_write,
126 .url_close = gopher_close,
127 .priv_data_size = sizeof(GopherContext),
128 .flags = URL_PROTOCOL_FLAG_NETWORK,
129 .default_whitelist = "gopher,tcp"
130 };
131 #endif /* CONFIG_GOPHER_PROTOCOL */
132
133 #if CONFIG_GOPHERS_PROTOCOL
134 const URLProtocol ff_gophers_protocol = {
135 .name = "gophers",
136 .url_open = gopher_open,
137 .url_read = gopher_read,
138 .url_write = gopher_write,
139 .url_close = gopher_close,
140 .priv_data_size = sizeof(GopherContext),
141 .flags = URL_PROTOCOL_FLAG_NETWORK,
142 .default_whitelist = "gopher,gophers,tcp,tls"
143 };
144 #endif /* CONFIG_GOPHERS_PROTOCOL */
145