/* * Copyright (c) 2013 Lukasz Marek * * 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 #include #include "libavutil/avstring.h" #include "libavutil/opt.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; } LIBSSHContext; static int libssh_close(URLContext *h) { LIBSSHContext *s = h->priv_data; if (s->file) sftp_close(s->file); if (s->sftp) sftp_free(s->sftp); if (s->session) { ssh_disconnect(s->session); ssh_free(s->session); } return 0; } static int libssh_open(URLContext *h, const char *url, int flags) { static const int verbosity = SSH_LOG_NOLOG; LIBSSHContext *s = h->priv_data; char proto[10], path[MAX_URL_SIZE], hostname[1024], credencials[1024]; int port = 22, access, ret; long timeout = s->rw_timeout * 1000; const char *user = NULL, *pass = NULL; char *end = NULL; sftp_attributes stat; av_url_split(proto, sizeof(proto), credencials, sizeof(credencials), hostname, sizeof(hostname), &port, path, sizeof(path), url); if (port <= 0 || port > 65535) port = 22; if (!(s->session = ssh_new())) { ret = AVERROR(ENOMEM); goto fail; } user = av_strtok(credencials, ":", &end); pass = av_strtok(end, ":", &end); ssh_options_set(s->session, SSH_OPTIONS_HOST, hostname); ssh_options_set(s->session, SSH_OPTIONS_PORT, &port); ssh_options_set(s->session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity); if (timeout > 0) ssh_options_set(s->session, SSH_OPTIONS_TIMEOUT_USEC, &timeout); if (user) ssh_options_set(s->session, SSH_OPTIONS_USER, user); if (ssh_connect(s->session) != SSH_OK) { av_log(h, AV_LOG_ERROR, "Connection failed. %s\n", ssh_get_error(s->session)); ret = AVERROR(EIO); goto fail; } if (pass && ssh_userauth_password(s->session, NULL, pass) != SSH_AUTH_SUCCESS) { av_log(h, AV_LOG_ERROR, "Error authenticating with password: %s\n", ssh_get_error(s->session)); ret = AVERROR(EACCES); goto fail; } if (!(s->sftp = sftp_new(s->session))) { av_log(h, AV_LOG_ERROR, "SFTP session creation failed: %s\n", ssh_get_error(s->session)); ret = AVERROR(ENOMEM); goto fail; } if (sftp_init(s->sftp) != SSH_OK) { av_log(h, AV_LOG_ERROR, "Error initializing sftp session: %s\n", ssh_get_error(s->session)); ret = AVERROR(EIO); goto fail; } if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) { access = O_CREAT | O_RDWR; if (s->trunc) access |= O_TRUNC; } else if (flags & AVIO_FLAG_WRITE) { access = O_CREAT | O_WRONLY; if (s->trunc) access |= O_TRUNC; } else { access = O_RDONLY; } if (!(s->file = sftp_open(s->sftp, path, access, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH))) { av_log(h, AV_LOG_ERROR, "Error opening sftp file: %s\n", ssh_get_error(s->session)); ret = AVERROR(EIO); goto fail; } if (!(stat = sftp_fstat(s->file))) { av_log(h, AV_LOG_WARNING, "Cannot stat remote file %s.\n", path); s->filesize = -1; } else { s->filesize = stat->size; sftp_attributes_free(stat); } return 0; fail: libssh_close(h); return ret; } static int64_t libssh_seek(URLContext *h, int64_t pos, int whence) { LIBSSHContext *s = h->priv_data; int64_t newpos; if (s->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 s->filesize; case SEEK_SET: newpos = pos; break; case SEEK_CUR: newpos = sftp_tell64(s->file); break; case SEEK_END: newpos = s->filesize + pos; break; default: return AVERROR(EINVAL); } if (sftp_seek64(s->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 *s = h->priv_data; int bytes_read; if ((bytes_read = sftp_read(s->file, buf, size)) < 0) { av_log(h, 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 *s = h->priv_data; int bytes_written; if ((bytes_written = sftp_write(s->file, buf, size)) < 0) { av_log(h, 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 }, {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, };