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/*
* Copyright (c) 2014 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 <libsmbclient.h>
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "internal.h"
#include "url.h"
typedef struct {
const AVClass *class;
SMBCCTX *ctx;
int fd;
int64_t filesize;
int trunc;
int timeout;
char *workgroup;
} LIBSMBContext;
static void libsmbc_get_auth_data(SMBCCTX *c, const char *server, const char *share,
char *workgroup, int workgroup_len,
char *username, int username_len,
char *password, int password_len)
{
/* Do nothing yet. Credentials are passed via url.
* Callback must exists, there might be a segmentation fault otherwise. */
}
static av_cold int libsmbc_connect(URLContext *h)
{
LIBSMBContext *libsmbc = h->priv_data;
libsmbc->ctx = smbc_new_context();
if (!libsmbc->ctx) {
av_log(h, AV_LOG_ERROR, "Cannot create context: %s.\n", strerror(errno));
return AVERROR(errno);
}
if (!smbc_init_context(libsmbc->ctx)) {
av_log(h, AV_LOG_ERROR, "Cannot initialize context: %s.\n", strerror(errno));
return AVERROR(errno);
}
smbc_set_context(libsmbc->ctx);
smbc_setOptionUserData(libsmbc->ctx, h);
smbc_setFunctionAuthDataWithContext(libsmbc->ctx, libsmbc_get_auth_data);
if (libsmbc->timeout != -1)
smbc_setTimeout(libsmbc->ctx, libsmbc->timeout);
if (libsmbc->workgroup)
smbc_setWorkgroup(libsmbc->ctx, libsmbc->workgroup);
if (smbc_init(NULL, 0) < 0) {
av_log(h, AV_LOG_ERROR, "Initialization failed: %s\n", strerror(errno));
return AVERROR(errno);
}
return 0;
}
static av_cold int libsmbc_close(URLContext *h)
{
LIBSMBContext *libsmbc = h->priv_data;
if (libsmbc->fd >= 0) {
smbc_close(libsmbc->fd);
libsmbc->fd = -1;
}
if (libsmbc->ctx) {
smbc_free_context(libsmbc->ctx, 1);
libsmbc->ctx = NULL;
}
return 0;
}
static av_cold int libsmbc_open(URLContext *h, const char *url, int flags)
{
LIBSMBContext *libsmbc = h->priv_data;
int access, ret;
struct stat st;
libsmbc->fd = -1;
libsmbc->filesize = -1;
if ((ret = libsmbc_connect(h)) < 0)
goto fail;
if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) {
access = O_CREAT | O_RDWR;
if (libsmbc->trunc)
access |= O_TRUNC;
} else if (flags & AVIO_FLAG_WRITE) {
access = O_CREAT | O_WRONLY;
if (libsmbc->trunc)
access |= O_TRUNC;
} else
access = O_RDONLY;
/* 0666 = -rw-rw-rw- = read+write for everyone, minus umask */
if ((libsmbc->fd = smbc_open(url, access, 0666)) < 0) {
ret = AVERROR(errno);
av_log(h, AV_LOG_ERROR, "File open failed: %s\n", strerror(errno));
goto fail;
}
if (smbc_fstat(libsmbc->fd, &st) < 0)
av_log(h, AV_LOG_WARNING, "Cannot stat file: %s\n", strerror(errno));
else
libsmbc->filesize = st.st_size;
return 0;
fail:
libsmbc_close(h);
return ret;
}
static int64_t libsmbc_seek(URLContext *h, int64_t pos, int whence)
{
LIBSMBContext *libsmbc = h->priv_data;
int64_t newpos;
if (whence == AVSEEK_SIZE) {
if (libsmbc->filesize == -1) {
av_log(h, AV_LOG_ERROR, "Error during seeking: filesize is unknown.\n");
return AVERROR(EIO);
} else
return libsmbc->filesize;
}
if ((newpos = smbc_lseek(libsmbc->fd, pos, whence)) < 0) {
int err = errno;
av_log(h, AV_LOG_ERROR, "Error during seeking: %s\n", strerror(err));
return AVERROR(err);
}
return newpos;
}
static int libsmbc_read(URLContext *h, unsigned char *buf, int size)
{
LIBSMBContext *libsmbc = h->priv_data;
int bytes_read;
if ((bytes_read = smbc_read(libsmbc->fd, buf, size)) < 0) {
av_log(h, AV_LOG_ERROR, "Read error: %s\n", strerror(errno));
return AVERROR(errno);
}
return bytes_read;
}
static int libsmbc_write(URLContext *h, const unsigned char *buf, int size)
{
LIBSMBContext *libsmbc = h->priv_data;
int bytes_written;
if ((bytes_written = smbc_write(libsmbc->fd, buf, size)) < 0) {
av_log(h, AV_LOG_ERROR, "Write error: %s\n", strerror(errno));
return AVERROR(errno);
}
return bytes_written;
}
#define OFFSET(x) offsetof(LIBSMBContext, x)
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{"timeout", "set timeout in ms of socket I/O operations", OFFSET(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 },
{"workgroup", "set the workgroup used for making connections", OFFSET(workgroup), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
{NULL}
};
static const AVClass libsmbclient_context_class = {
.class_name = "libsmbc",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
URLProtocol ff_libsmbclient_protocol = {
.name = "smb",
.url_open = libsmbc_open,
.url_read = libsmbc_read,
.url_write = libsmbc_write,
.url_seek = libsmbc_seek,
.url_close = libsmbc_close,
.priv_data_size = sizeof(LIBSMBContext),
.priv_data_class = &libsmbclient_context_class,
.flags = URL_PROTOCOL_FLAG_NETWORK,
};
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