/* * 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 "config_components.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_PROTOCOLconst 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_PROTOCOLconst 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 */