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/*
* Gopher protocol
*
* Copyright (c) 2009 Toshimitsu Kimura
* Copyright (c) 2021 parazyd <parazyd@dyne.org>
*
* based on libavformat/http.c, Copyright (c) 2000, 2001 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "libavutil/avstring.h"
#include "avformat.h"
#include "internal.h"
#include "network.h"
#include "url.h"
typedef struct GopherContext {
URLContext *hd;
} GopherContext;
static int gopher_write(URLContext *h, const uint8_t *buf, int size)
{
GopherContext *s = h->priv_data;
return ffurl_write(s->hd, buf, size);
}
static int gopher_connect(URLContext *h, const char *path)
{
char buffer[1024];
if (!*path) return AVERROR(EINVAL);
switch (*++path) {
case '5':
case '9':
path = strchr(path, '/');
if (!path) return AVERROR(EINVAL);
break;
default:
av_log(h, AV_LOG_WARNING,
"Gopher protocol type '%c' not supported yet!\n",
*path);
return AVERROR(EINVAL);
}
/* send gopher sector */
snprintf(buffer, sizeof(buffer), "%s\r\n", path);
if (gopher_write(h, buffer, strlen(buffer)) < 0)
return AVERROR(EIO);
return 0;
}
static int gopher_close(URLContext *h)
{
GopherContext *s = h->priv_data;
ffurl_closep(&s->hd);
return 0;
}
static int gopher_open(URLContext *h, const char *uri, int flags)
{
GopherContext *s = h->priv_data;
char proto[10], hostname[1024], auth[1024], path[1024], buf[1024];
int port, err;
const char *lower_proto = "tcp";
h->is_streamed = 1;
/* needed in any case to build the host string */
av_url_split(proto, sizeof(proto), auth, sizeof(auth),
hostname, sizeof(hostname), &port, path, sizeof(path), uri);
if (port < 0)
port = 70;
if (!strcmp(proto, "gophers"))
lower_proto = "tls";
ff_url_join(buf, sizeof(buf), lower_proto, NULL, hostname, port, NULL);
s->hd = NULL;
err = ffurl_open_whitelist(&s->hd, buf, AVIO_FLAG_READ_WRITE,
&h->interrupt_callback, NULL, h->protocol_whitelist, h->protocol_blacklist, h);
if (err < 0)
goto fail;
if ((err = gopher_connect(h, path)) < 0)
goto fail;
return 0;
fail:
gopher_close(h);
return err;
}
static int gopher_read(URLContext *h, uint8_t *buf, int size)
{
GopherContext *s = h->priv_data;
int len = ffurl_read(s->hd, buf, size);
return len;
}
#if CONFIG_GOPHER_PROTOCOL
const URLProtocol ff_gopher_protocol = {
.name = "gopher",
.url_open = gopher_open,
.url_read = gopher_read,
.url_write = gopher_write,
.url_close = gopher_close,
.priv_data_size = sizeof(GopherContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.default_whitelist = "gopher,tcp"
};
#endif /* CONFIG_GOPHER_PROTOCOL */
#if CONFIG_GOPHERS_PROTOCOL
const URLProtocol ff_gophers_protocol = {
.name = "gophers",
.url_open = gopher_open,
.url_read = gopher_read,
.url_write = gopher_write,
.url_close = gopher_close,
.priv_data_size = sizeof(GopherContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.default_whitelist = "gopher,gophers,tcp,tls"
};
#endif /* CONFIG_GOPHERS_PROTOCOL */
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