forked from KolibriOS/kolibrios
230 lines
6.6 KiB
C
230 lines
6.6 KiB
C
/*
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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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#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 "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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int64_t filesize;
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int rw_timeout;
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int trunc;
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} LIBSSHContext;
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static int libssh_close(URLContext *h)
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{
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LIBSSHContext *s = h->priv_data;
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if (s->file)
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sftp_close(s->file);
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if (s->sftp)
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sftp_free(s->sftp);
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if (s->session) {
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ssh_disconnect(s->session);
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ssh_free(s->session);
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}
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return 0;
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}
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static int libssh_open(URLContext *h, const char *url, int flags)
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{
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static const int verbosity = SSH_LOG_NOLOG;
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LIBSSHContext *s = h->priv_data;
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char proto[10], path[MAX_URL_SIZE], hostname[1024], credencials[1024];
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int port = 22, access, ret;
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long timeout = s->rw_timeout * 1000;
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const char *user = NULL, *pass = NULL;
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char *end = NULL;
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sftp_attributes stat;
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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, sizeof(path),
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url);
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if (port <= 0 || port > 65535)
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port = 22;
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if (!(s->session = ssh_new())) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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user = av_strtok(credencials, ":", &end);
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pass = av_strtok(end, ":", &end);
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ssh_options_set(s->session, SSH_OPTIONS_HOST, hostname);
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ssh_options_set(s->session, SSH_OPTIONS_PORT, &port);
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ssh_options_set(s->session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);
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if (timeout > 0)
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ssh_options_set(s->session, SSH_OPTIONS_TIMEOUT_USEC, &timeout);
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if (user)
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ssh_options_set(s->session, SSH_OPTIONS_USER, user);
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if (ssh_connect(s->session) != SSH_OK) {
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av_log(h, AV_LOG_ERROR, "Connection failed. %s\n", ssh_get_error(s->session));
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ret = AVERROR(EIO);
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goto fail;
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}
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if (pass && ssh_userauth_password(s->session, NULL, pass) != SSH_AUTH_SUCCESS) {
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av_log(h, AV_LOG_ERROR, "Error authenticating with password: %s\n", ssh_get_error(s->session));
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ret = AVERROR(EACCES);
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goto fail;
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}
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if (!(s->sftp = sftp_new(s->session))) {
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av_log(h, AV_LOG_ERROR, "SFTP session creation failed: %s\n", ssh_get_error(s->session));
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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if (sftp_init(s->sftp) != SSH_OK) {
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av_log(h, AV_LOG_ERROR, "Error initializing sftp session: %s\n", ssh_get_error(s->session));
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ret = AVERROR(EIO);
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goto fail;
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}
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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 (s->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 (s->trunc)
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access |= O_TRUNC;
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} else {
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access = O_RDONLY;
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}
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if (!(s->file = sftp_open(s->sftp, path, access, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH))) {
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av_log(h, AV_LOG_ERROR, "Error opening sftp file: %s\n", ssh_get_error(s->session));
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ret = AVERROR(EIO);
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goto fail;
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}
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if (!(stat = sftp_fstat(s->file))) {
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av_log(h, AV_LOG_WARNING, "Cannot stat remote file %s.\n", path);
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s->filesize = -1;
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} else {
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s->filesize = stat->size;
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sftp_attributes_free(stat);
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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 int64_t libssh_seek(URLContext *h, int64_t pos, int whence)
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{
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LIBSSHContext *s = h->priv_data;
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int64_t newpos;
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if (s->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 s->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(s->file);
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break;
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case SEEK_END:
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newpos = s->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 (sftp_seek64(s->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 *s = h->priv_data;
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int bytes_read;
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if ((bytes_read = sftp_read(s->file, buf, size)) < 0) {
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av_log(h, AV_LOG_ERROR, "Read error.\n");
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return AVERROR(EIO);
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}
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return bytes_read;
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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 *s = h->priv_data;
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int bytes_written;
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if ((bytes_written = sftp_write(s->file, buf, size)) < 0) {
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av_log(h, 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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#define OFFSET(x) offsetof(LIBSSHContext, x)
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#define D AV_OPT_FLAG_DECODING_PARAM
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#define E AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{"timeout", "set timeout of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
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{"truncate", "Truncate existing files on write", OFFSET(trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
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{NULL}
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};
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static const AVClass libssh_context_class = {
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.class_name = "libssh",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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URLProtocol ff_libssh_protocol = {
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.name = "sftp",
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.url_open = libssh_open,
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.url_read = libssh_read,
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.url_write = libssh_write,
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.url_seek = libssh_seek,
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.url_close = libssh_close,
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.priv_data_size = sizeof(LIBSSHContext),
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.priv_data_class = &libssh_context_class,
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.flags = URL_PROTOCOL_FLAG_NETWORK,
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};
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