508 lines
15 KiB
C
508 lines
15 KiB
C
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/*
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* Copyright (c) 2013 Lukasz Marek <lukasz.m.luki@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <fcntl.h>
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#define LIBSSH_STATIC
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#include <libssh/sftp.h>
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "libavutil/attributes.h"
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#include "libavformat/avio.h"
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#include "avformat.h"
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#include "internal.h"
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#include "url.h"
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typedef struct {
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const AVClass *class;
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ssh_session session;
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sftp_session sftp;
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sftp_file file;
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sftp_dir dir;
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int64_t filesize;
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int rw_timeout;
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int trunc;
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char *priv_key;
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} LIBSSHContext;
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static av_cold int libssh_create_ssh_session(LIBSSHContext *libssh, const char* hostname, unsigned int port)
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{
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static const int verbosity = SSH_LOG_NOLOG;
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if (!(libssh->session = ssh_new())) {
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av_log(libssh, AV_LOG_ERROR, "SSH session creation failed: %s\n", ssh_get_error(libssh->session));
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return AVERROR(ENOMEM);
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}
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ssh_options_set(libssh->session, SSH_OPTIONS_HOST, hostname);
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ssh_options_set(libssh->session, SSH_OPTIONS_PORT, &port);
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ssh_options_set(libssh->session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);
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if (libssh->rw_timeout > 0) {
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long timeout = libssh->rw_timeout * 1000;
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ssh_options_set(libssh->session, SSH_OPTIONS_TIMEOUT_USEC, &timeout);
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}
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if (ssh_options_parse_config(libssh->session, NULL) < 0) {
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av_log(libssh, AV_LOG_WARNING, "Could not parse the config file.\n");
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}
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if (ssh_connect(libssh->session) != SSH_OK) {
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av_log(libssh, AV_LOG_ERROR, "Connection failed: %s\n", ssh_get_error(libssh->session));
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return AVERROR(EIO);
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}
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return 0;
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}
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static av_cold int libssh_authentication(LIBSSHContext *libssh, const char *user, const char *password)
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{
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int authorized = 0;
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int auth_methods;
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if (user)
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ssh_options_set(libssh->session, SSH_OPTIONS_USER, user);
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if (ssh_userauth_none(libssh->session, NULL) == SSH_AUTH_SUCCESS)
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return 0;
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auth_methods = ssh_userauth_list(libssh->session, NULL);
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if (auth_methods & SSH_AUTH_METHOD_PUBLICKEY) {
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if (libssh->priv_key) {
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ssh_string pub_key;
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ssh_private_key priv_key;
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int type;
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if (!ssh_try_publickey_from_file(libssh->session, libssh->priv_key, &pub_key, &type)) {
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priv_key = privatekey_from_file(libssh->session, libssh->priv_key, type, password);
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if (ssh_userauth_pubkey(libssh->session, NULL, pub_key, priv_key) == SSH_AUTH_SUCCESS) {
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av_log(libssh, AV_LOG_DEBUG, "Authentication successful with selected private key.\n");
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authorized = 1;
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}
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} else {
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av_log(libssh, AV_LOG_DEBUG, "Invalid key is provided.\n");
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return AVERROR(EACCES);
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}
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} else if (ssh_userauth_autopubkey(libssh->session, password) == SSH_AUTH_SUCCESS) {
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av_log(libssh, AV_LOG_DEBUG, "Authentication successful with auto selected key.\n");
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authorized = 1;
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}
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}
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if (!authorized && password && (auth_methods & SSH_AUTH_METHOD_PASSWORD)) {
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if (ssh_userauth_password(libssh->session, NULL, password) == SSH_AUTH_SUCCESS) {
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av_log(libssh, AV_LOG_DEBUG, "Authentication successful with password.\n");
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authorized = 1;
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}
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}
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if (!authorized) {
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av_log(libssh, AV_LOG_ERROR, "Authentication failed.\n");
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return AVERROR(EACCES);
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}
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return 0;
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}
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static av_cold int libssh_create_sftp_session(LIBSSHContext *libssh)
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{
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if (!(libssh->sftp = sftp_new(libssh->session))) {
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av_log(libssh, AV_LOG_ERROR, "SFTP session creation failed: %s\n", ssh_get_error(libssh->session));
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return AVERROR(ENOMEM);
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}
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if (sftp_init(libssh->sftp) != SSH_OK) {
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av_log(libssh, AV_LOG_ERROR, "Error initializing sftp session: %s\n", ssh_get_error(libssh->session));
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return AVERROR(EIO);
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}
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return 0;
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}
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static av_cold int libssh_open_file(LIBSSHContext *libssh, int flags, const char *file)
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{
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int access;
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if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) {
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access = O_CREAT | O_RDWR;
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if (libssh->trunc)
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access |= O_TRUNC;
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} else if (flags & AVIO_FLAG_WRITE) {
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access = O_CREAT | O_WRONLY;
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if (libssh->trunc)
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access |= O_TRUNC;
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} else
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access = O_RDONLY;
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/* 0666 = -rw-rw-rw- = read+write for everyone, minus umask */
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if (!(libssh->file = sftp_open(libssh->sftp, file, access, 0666))) {
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av_log(libssh, AV_LOG_ERROR, "Error opening sftp file: %s\n", ssh_get_error(libssh->session));
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return AVERROR(EIO);
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}
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return 0;
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}
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static av_cold void libssh_stat_file(LIBSSHContext *libssh)
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{
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sftp_attributes stat;
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if (!(stat = sftp_fstat(libssh->file))) {
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av_log(libssh, AV_LOG_WARNING, "Cannot stat remote file.\n");
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libssh->filesize = -1;
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} else {
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libssh->filesize = stat->size;
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sftp_attributes_free(stat);
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}
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}
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static av_cold int libssh_close(URLContext *h)
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{
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LIBSSHContext *libssh = h->priv_data;
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if (libssh->file) {
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sftp_close(libssh->file);
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libssh->file = NULL;
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}
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if (libssh->sftp) {
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sftp_free(libssh->sftp);
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libssh->sftp = NULL;
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}
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if (libssh->session) {
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ssh_disconnect(libssh->session);
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ssh_free(libssh->session);
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libssh->session = NULL;
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}
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return 0;
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}
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static av_cold int libssh_connect(URLContext *h, const char *url, char *path, size_t path_size)
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{
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LIBSSHContext *libssh = h->priv_data;
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char proto[10], hostname[1024], credencials[1024];
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int port = 22, ret;
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const char *user = NULL, *pass = NULL;
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char *end = NULL;
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av_url_split(proto, sizeof(proto),
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credencials, sizeof(credencials),
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hostname, sizeof(hostname),
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&port,
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path, path_size,
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url);
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if (!(*path))
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av_strlcpy(path, "/", path_size);
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// a port of 0 will use a port from ~/.ssh/config or the default value 22
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if (port < 0 || port > 65535)
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port = 0;
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if ((ret = libssh_create_ssh_session(libssh, hostname, port)) < 0)
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return ret;
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user = av_strtok(credencials, ":", &end);
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pass = av_strtok(end, ":", &end);
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if ((ret = libssh_authentication(libssh, user, pass)) < 0)
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return ret;
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if ((ret = libssh_create_sftp_session(libssh)) < 0)
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return ret;
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return 0;
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}
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static av_cold int libssh_open(URLContext *h, const char *url, int flags)
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{
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int ret;
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LIBSSHContext *libssh = h->priv_data;
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char path[MAX_URL_SIZE];
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if ((ret = libssh_connect(h, url, path, sizeof(path))) < 0)
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goto fail;
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if ((ret = libssh_open_file(libssh, flags, path)) < 0)
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goto fail;
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libssh_stat_file(libssh);
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return 0;
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fail:
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libssh_close(h);
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return ret;
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}
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static int64_t libssh_seek(URLContext *h, int64_t pos, int whence)
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{
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LIBSSHContext *libssh = h->priv_data;
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int64_t newpos;
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if (libssh->filesize == -1 && (whence == AVSEEK_SIZE || whence == SEEK_END)) {
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av_log(h, AV_LOG_ERROR, "Error during seeking.\n");
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return AVERROR(EIO);
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}
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switch(whence) {
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case AVSEEK_SIZE:
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return libssh->filesize;
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case SEEK_SET:
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newpos = pos;
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break;
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case SEEK_CUR:
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newpos = sftp_tell64(libssh->file) + pos;
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break;
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case SEEK_END:
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newpos = libssh->filesize + pos;
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break;
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default:
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return AVERROR(EINVAL);
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}
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if (newpos < 0) {
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av_log(h, AV_LOG_ERROR, "Seeking to nagative position.\n");
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return AVERROR(EINVAL);
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}
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if (sftp_seek64(libssh->file, newpos)) {
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av_log(h, AV_LOG_ERROR, "Error during seeking.\n");
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return AVERROR(EIO);
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}
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return newpos;
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}
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static int libssh_read(URLContext *h, unsigned char *buf, int size)
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{
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LIBSSHContext *libssh = h->priv_data;
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int bytes_read;
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if ((bytes_read = sftp_read(libssh->file, buf, size)) < 0) {
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av_log(libssh, AV_LOG_ERROR, "Read error.\n");
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return AVERROR(EIO);
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}
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return bytes_read ? bytes_read : AVERROR_EOF;
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}
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static int libssh_write(URLContext *h, const unsigned char *buf, int size)
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{
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LIBSSHContext *libssh = h->priv_data;
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int bytes_written;
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if ((bytes_written = sftp_write(libssh->file, buf, size)) < 0) {
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av_log(libssh, AV_LOG_ERROR, "Write error.\n");
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return AVERROR(EIO);
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}
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return bytes_written;
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}
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static int libssh_open_dir(URLContext *h)
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{
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LIBSSHContext *libssh = h->priv_data;
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int ret;
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char path[MAX_URL_SIZE];
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if ((ret = libssh_connect(h, h->filename, path, sizeof(path))) < 0)
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goto fail;
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if (!(libssh->dir = sftp_opendir(libssh->sftp, path))) {
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av_log(libssh, AV_LOG_ERROR, "Error opening sftp dir: %s\n", ssh_get_error(libssh->session));
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ret = AVERROR(EIO);
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goto fail;
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}
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return 0;
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fail:
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libssh_close(h);
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return ret;
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}
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static int libssh_read_dir(URLContext *h, AVIODirEntry **next)
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{
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LIBSSHContext *libssh = h->priv_data;
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sftp_attributes attr = NULL;
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AVIODirEntry *entry;
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*next = entry = ff_alloc_dir_entry();
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if (!entry)
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return AVERROR(ENOMEM);
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do {
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if (attr)
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sftp_attributes_free(attr);
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attr = sftp_readdir(libssh->sftp, libssh->dir);
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if (!attr) {
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av_freep(next);
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if (sftp_dir_eof(libssh->dir))
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return 0;
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return AVERROR(EIO);
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}
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} while (!strcmp(attr->name, ".") || !strcmp(attr->name, ".."));
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entry->name = av_strdup(attr->name);
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entry->group_id = attr->gid;
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entry->user_id = attr->uid;
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entry->size = attr->size;
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entry->access_timestamp = INT64_C(1000000) * attr->atime;
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entry->modification_timestamp = INT64_C(1000000) * attr->mtime;
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entry->filemode = attr->permissions & 0777;
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switch(attr->type) {
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case SSH_FILEXFER_TYPE_REGULAR:
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entry->type = AVIO_ENTRY_FILE;
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break;
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case SSH_FILEXFER_TYPE_DIRECTORY:
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|
|
entry->type = AVIO_ENTRY_DIRECTORY;
|
||
|
|
break;
|
||
|
|
case SSH_FILEXFER_TYPE_SYMLINK:
|
||
|
|
entry->type = AVIO_ENTRY_SYMBOLIC_LINK;
|
||
|
|
break;
|
||
|
|
case SSH_FILEXFER_TYPE_SPECIAL:
|
||
|
|
/* Special type includes: sockets, char devices, block devices and pipes.
|
||
|
|
It is probably better to return unknown type, to not confuse anybody. */
|
||
|
|
case SSH_FILEXFER_TYPE_UNKNOWN:
|
||
|
|
default:
|
||
|
|
entry->type = AVIO_ENTRY_UNKNOWN;
|
||
|
|
}
|
||
|
|
sftp_attributes_free(attr);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int libssh_close_dir(URLContext *h)
|
||
|
|
{
|
||
|
|
LIBSSHContext *libssh = h->priv_data;
|
||
|
|
if (libssh->dir)
|
||
|
|
sftp_closedir(libssh->dir);
|
||
|
|
libssh->dir = NULL;
|
||
|
|
libssh_close(h);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int libssh_delete(URLContext *h)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
LIBSSHContext *libssh = h->priv_data;
|
||
|
|
sftp_attributes attr = NULL;
|
||
|
|
char path[MAX_URL_SIZE];
|
||
|
|
|
||
|
|
if ((ret = libssh_connect(h, h->filename, path, sizeof(path))) < 0)
|
||
|
|
goto cleanup;
|
||
|
|
|
||
|
|
if (!(attr = sftp_stat(libssh->sftp, path))) {
|
||
|
|
ret = AVERROR(sftp_get_error(libssh->sftp));
|
||
|
|
goto cleanup;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (attr->type == SSH_FILEXFER_TYPE_DIRECTORY) {
|
||
|
|
if (sftp_rmdir(libssh->sftp, path) < 0) {
|
||
|
|
ret = AVERROR(sftp_get_error(libssh->sftp));
|
||
|
|
goto cleanup;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (sftp_unlink(libssh->sftp, path) < 0) {
|
||
|
|
ret = AVERROR(sftp_get_error(libssh->sftp));
|
||
|
|
goto cleanup;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = 0;
|
||
|
|
|
||
|
|
cleanup:
|
||
|
|
if (attr)
|
||
|
|
sftp_attributes_free(attr);
|
||
|
|
libssh_close(h);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int libssh_move(URLContext *h_src, URLContext *h_dst)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
LIBSSHContext *libssh = h_src->priv_data;
|
||
|
|
char path_src[MAX_URL_SIZE], path_dst[MAX_URL_SIZE];
|
||
|
|
char hostname_src[1024], hostname_dst[1024];
|
||
|
|
char credentials_src[1024], credentials_dst[1024];
|
||
|
|
int port_src = 22, port_dst = 22;
|
||
|
|
|
||
|
|
av_url_split(NULL, 0,
|
||
|
|
credentials_src, sizeof(credentials_src),
|
||
|
|
hostname_src, sizeof(hostname_src),
|
||
|
|
&port_src,
|
||
|
|
path_src, sizeof(path_src),
|
||
|
|
h_src->filename);
|
||
|
|
|
||
|
|
av_url_split(NULL, 0,
|
||
|
|
credentials_dst, sizeof(credentials_dst),
|
||
|
|
hostname_dst, sizeof(hostname_dst),
|
||
|
|
&port_dst,
|
||
|
|
path_dst, sizeof(path_dst),
|
||
|
|
h_dst->filename);
|
||
|
|
|
||
|
|
if (strcmp(credentials_src, credentials_dst) ||
|
||
|
|
strcmp(hostname_src, hostname_dst) ||
|
||
|
|
port_src != port_dst) {
|
||
|
|
return AVERROR(EINVAL);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((ret = libssh_connect(h_src, h_src->filename, path_src, sizeof(path_src))) < 0)
|
||
|
|
goto cleanup;
|
||
|
|
|
||
|
|
if (sftp_rename(libssh->sftp, path_src, path_dst) < 0) {
|
||
|
|
ret = AVERROR(sftp_get_error(libssh->sftp));
|
||
|
|
goto cleanup;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = 0;
|
||
|
|
|
||
|
|
cleanup:
|
||
|
|
libssh_close(h_src);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define OFFSET(x) offsetof(LIBSSHContext, x)
|
||
|
|
#define D AV_OPT_FLAG_DECODING_PARAM
|
||
|
|
#define E AV_OPT_FLAG_ENCODING_PARAM
|
||
|
|
static const AVOption options[] = {
|
||
|
|
{"timeout", "set timeout of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
|
||
|
|
{"truncate", "Truncate existing files on write", OFFSET(trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
|
||
|
|
{"private_key", "set path to private key", OFFSET(priv_key), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D|E },
|
||
|
|
{NULL}
|
||
|
|
};
|
||
|
|
|
||
|
|
static const AVClass libssh_context_class = {
|
||
|
|
.class_name = "libssh",
|
||
|
|
.item_name = av_default_item_name,
|
||
|
|
.option = options,
|
||
|
|
.version = LIBAVUTIL_VERSION_INT,
|
||
|
|
};
|
||
|
|
|
||
|
|
const URLProtocol ff_libssh_protocol = {
|
||
|
|
.name = "sftp",
|
||
|
|
.url_open = libssh_open,
|
||
|
|
.url_read = libssh_read,
|
||
|
|
.url_write = libssh_write,
|
||
|
|
.url_seek = libssh_seek,
|
||
|
|
.url_close = libssh_close,
|
||
|
|
.url_delete = libssh_delete,
|
||
|
|
.url_move = libssh_move,
|
||
|
|
.url_open_dir = libssh_open_dir,
|
||
|
|
.url_read_dir = libssh_read_dir,
|
||
|
|
.url_close_dir = libssh_close_dir,
|
||
|
|
.priv_data_size = sizeof(LIBSSHContext),
|
||
|
|
.priv_data_class = &libssh_context_class,
|
||
|
|
.flags = URL_PROTOCOL_FLAG_NETWORK,
|
||
|
|
};
|