diff options
Diffstat (limited to 'libavformat/libssh.c')
-rw-r--r-- | libavformat/libssh.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/libavformat/libssh.c b/libavformat/libssh.c new file mode 100644 index 0000000..fac6114 --- /dev/null +++ b/libavformat/libssh.c @@ -0,0 +1,323 @@ +/* + * Copyright (c) 2013 Lukasz Marek <lukasz.m.luki@gmail.com> + * + * 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 <fcntl.h> +#define LIBSSH_STATIC +#include <libssh/sftp.h> +#include "libavutil/avstring.h" +#include "libavutil/opt.h" +#include "libavutil/attributes.h" +#include "avformat.h" +#include "internal.h" +#include "url.h" + +typedef struct { + const AVClass *class; + ssh_session session; + sftp_session sftp; + sftp_file file; + int64_t filesize; + int rw_timeout; + int trunc; + char *priv_key; +} LIBSSHContext; + +static av_cold int libssh_create_ssh_session(LIBSSHContext *libssh, const char* hostname, unsigned int port) +{ + static const int verbosity = SSH_LOG_NOLOG; + + if (!(libssh->session = ssh_new())) { + av_log(libssh, AV_LOG_ERROR, "SSH session creation failed: %s\n", ssh_get_error(libssh->session)); + return AVERROR(ENOMEM); + } + ssh_options_set(libssh->session, SSH_OPTIONS_HOST, hostname); + ssh_options_set(libssh->session, SSH_OPTIONS_PORT, &port); + ssh_options_set(libssh->session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity); + if (libssh->rw_timeout > 0) { + long timeout = libssh->rw_timeout * 1000; + ssh_options_set(libssh->session, SSH_OPTIONS_TIMEOUT_USEC, &timeout); + } + + if (ssh_options_parse_config(libssh->session, NULL) < 0) { + av_log(libssh, AV_LOG_WARNING, "Could not parse the config file.\n"); + } + + if (ssh_connect(libssh->session) != SSH_OK) { + av_log(libssh, AV_LOG_ERROR, "Connection failed: %s\n", ssh_get_error(libssh->session)); + return AVERROR(EIO); + } + + return 0; +} + +static av_cold int libssh_authentication(LIBSSHContext *libssh, const char *user, const char *password) +{ + int authorized = 0; + int auth_methods; + + if (user) + ssh_options_set(libssh->session, SSH_OPTIONS_USER, user); + + if (ssh_userauth_none(libssh->session, NULL) == SSH_AUTH_SUCCESS) + return 0; + + auth_methods = ssh_userauth_list(libssh->session, NULL); + + if (auth_methods & SSH_AUTH_METHOD_PUBLICKEY) { + if (libssh->priv_key) { + ssh_string pub_key; + ssh_private_key priv_key; + int type; + if (!ssh_try_publickey_from_file(libssh->session, libssh->priv_key, &pub_key, &type)) { + priv_key = privatekey_from_file(libssh->session, libssh->priv_key, type, password); + if (ssh_userauth_pubkey(libssh->session, NULL, pub_key, priv_key) == SSH_AUTH_SUCCESS) { + av_log(libssh, AV_LOG_DEBUG, "Authentication successful with selected private key.\n"); + authorized = 1; + } + } else { + av_log(libssh, AV_LOG_DEBUG, "Invalid key is provided.\n"); + return AVERROR(EACCES); + } + } else if (ssh_userauth_autopubkey(libssh->session, password) == SSH_AUTH_SUCCESS) { + av_log(libssh, AV_LOG_DEBUG, "Authentication successful with auto selected key.\n"); + authorized = 1; + } + } + + if (!authorized && (auth_methods & SSH_AUTH_METHOD_PASSWORD)) { + if (ssh_userauth_password(libssh->session, NULL, password) == SSH_AUTH_SUCCESS) { + av_log(libssh, AV_LOG_DEBUG, "Authentication successful with password.\n"); + authorized = 1; + } + } + + if (!authorized) { + av_log(libssh, AV_LOG_ERROR, "Authentication failed.\n"); + return AVERROR(EACCES); + } + + return 0; +} + +static av_cold int libssh_create_sftp_session(LIBSSHContext *libssh) +{ + if (!(libssh->sftp = sftp_new(libssh->session))) { + av_log(libssh, AV_LOG_ERROR, "SFTP session creation failed: %s\n", ssh_get_error(libssh->session)); + return AVERROR(ENOMEM); + } + + if (sftp_init(libssh->sftp) != SSH_OK) { + av_log(libssh, AV_LOG_ERROR, "Error initializing sftp session: %s\n", ssh_get_error(libssh->session)); + return AVERROR(EIO); + } + + return 0; +} + +static av_cold int libssh_open_file(LIBSSHContext *libssh, int flags, const char *file) +{ + int access; + + if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) { + access = O_CREAT | O_RDWR; + if (libssh->trunc) + access |= O_TRUNC; + } else if (flags & AVIO_FLAG_WRITE) { + access = O_CREAT | O_WRONLY; + if (libssh->trunc) + access |= O_TRUNC; + } else + access = O_RDONLY; + + /* 0666 = -rw-rw-rw- = read+write for everyone, minus umask */ + if (!(libssh->file = sftp_open(libssh->sftp, file, access, 0666))) { + av_log(libssh, AV_LOG_ERROR, "Error opening sftp file: %s\n", ssh_get_error(libssh->session)); + return AVERROR(EIO); + } + + return 0; +} + +static av_cold void libssh_stat_file(LIBSSHContext *libssh) +{ + sftp_attributes stat; + + if (!(stat = sftp_fstat(libssh->file))) { + av_log(libssh, AV_LOG_WARNING, "Cannot stat remote file.\n"); + libssh->filesize = -1; + } else { + libssh->filesize = stat->size; + sftp_attributes_free(stat); + } +} + +static av_cold int libssh_close(URLContext *h) +{ + LIBSSHContext *libssh = h->priv_data; + if (libssh->file) { + sftp_close(libssh->file); + libssh->file = NULL; + } + if (libssh->sftp) { + sftp_free(libssh->sftp); + libssh->sftp = NULL; + } + if (libssh->session) { + ssh_disconnect(libssh->session); + ssh_free(libssh->session); + libssh->session = NULL; + } + return 0; +} + +static av_cold int libssh_open(URLContext *h, const char *url, int flags) +{ + LIBSSHContext *libssh = h->priv_data; + char proto[10], path[MAX_URL_SIZE], hostname[1024], credencials[1024]; + int port, ret; + const char *user = NULL, *pass = NULL; + char *end = NULL; + + av_url_split(proto, sizeof(proto), + credencials, sizeof(credencials), + hostname, sizeof(hostname), + &port, + path, sizeof(path), + url); + + // a port of 0 will use a port from ~/.ssh/config or the default value 22 + if (port < 0 || port > 65535) + port = 0; + + if ((ret = libssh_create_ssh_session(libssh, hostname, port)) < 0) + goto fail; + + user = av_strtok(credencials, ":", &end); + pass = av_strtok(end, ":", &end); + + if ((ret = libssh_authentication(libssh, user, pass)) < 0) + goto fail; + + if ((ret = libssh_create_sftp_session(libssh)) < 0) + goto fail; + + if ((ret = libssh_open_file(libssh, flags, path)) < 0) + goto fail; + + libssh_stat_file(libssh); + + return 0; + + fail: + libssh_close(h); + return ret; +} + +static int64_t libssh_seek(URLContext *h, int64_t pos, int whence) +{ + LIBSSHContext *libssh = h->priv_data; + int64_t newpos; + + if (libssh->filesize == -1 && (whence == AVSEEK_SIZE || whence == SEEK_END)) { + av_log(h, AV_LOG_ERROR, "Error during seeking.\n"); + return AVERROR(EIO); + } + + switch(whence) { + case AVSEEK_SIZE: + return libssh->filesize; + case SEEK_SET: + newpos = pos; + break; + case SEEK_CUR: + newpos = sftp_tell64(libssh->file) + pos; + break; + case SEEK_END: + newpos = libssh->filesize + pos; + break; + default: + return AVERROR(EINVAL); + } + + if (newpos < 0) { + av_log(h, AV_LOG_ERROR, "Seeking to nagative position.\n"); + return AVERROR(EINVAL); + } + + if (sftp_seek64(libssh->file, newpos)) { + av_log(h, AV_LOG_ERROR, "Error during seeking.\n"); + return AVERROR(EIO); + } + + return newpos; +} + +static int libssh_read(URLContext *h, unsigned char *buf, int size) +{ + LIBSSHContext *libssh = h->priv_data; + int bytes_read; + + if ((bytes_read = sftp_read(libssh->file, buf, size)) < 0) { + av_log(libssh, AV_LOG_ERROR, "Read error.\n"); + return AVERROR(EIO); + } + return bytes_read; +} + +static int libssh_write(URLContext *h, const unsigned char *buf, int size) +{ + LIBSSHContext *libssh = h->priv_data; + int bytes_written; + + if ((bytes_written = sftp_write(libssh->file, buf, size)) < 0) { + av_log(libssh, AV_LOG_ERROR, "Write error.\n"); + return AVERROR(EIO); + } + return bytes_written; +} + +#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, +}; + +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, + .priv_data_size = sizeof(LIBSSHContext), + .priv_data_class = &libssh_context_class, + .flags = URL_PROTOCOL_FLAG_NETWORK, +}; 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