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/*
* Copyright 2003-2020 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "SmbclientInputPlugin.hxx"
#include "lib/smbclient/Init.hxx"
#include "lib/smbclient/Context.hxx"
#include "lib/smbclient/Mutex.hxx"
#include "../InputStream.hxx"
#include "../InputPlugin.hxx"
#include "../MaybeBufferedInputStream.hxx"
#include "PluginUnavailable.hxx"
#include "system/Error.hxx"
#include <libsmbclient.h>
class SmbclientInputStream final : public InputStream {
SmbclientContext ctx;
int fd;
public:
SmbclientInputStream(const char *_uri,
Mutex &_mutex,
SmbclientContext &&_ctx,
int _fd, const struct stat &st)
:InputStream(_uri, _mutex),
ctx(std::move(_ctx)), fd(_fd)
{
seekable = true;
size = st.st_size;
SetReady();
}
~SmbclientInputStream() override {
const std::lock_guard<Mutex> lock(smbclient_mutex);
smbc_close(fd);
}
/* virtual methods from InputStream */
[[nodiscard]] bool IsEOF() const noexcept override {
return offset >= size;
}
size_t Read(std::unique_lock<Mutex> &lock,
void *ptr, size_t size) override;
void Seek(std::unique_lock<Mutex> &lock, offset_type offset) override;
};
/*
* InputPlugin methods
*
*/
static void
input_smbclient_init(EventLoop &, const ConfigBlock &)
{
try {
SmbclientInit();
} catch (...) {
std::throw_with_nested(PluginUnavailable("libsmbclient initialization failed"));
}
// TODO: create one global SMBCCTX here?
// TODO: evaluate ConfigBlock, call smbc_setOption*()
}
static InputStreamPtr
input_smbclient_open(const char *uri,
Mutex &mutex)
{
auto ctx = SmbclientContext::New();
const std::lock_guard<Mutex> protect(smbclient_mutex);
int fd = smbc_open(uri, O_RDONLY, 0);
if (fd < 0)
throw MakeErrno("smbc_open() failed");
struct stat st;
if (smbc_fstat(fd, &st) < 0)
throw MakeErrno("smbc_fstat() failed");
return std::make_unique<MaybeBufferedInputStream>
(std::make_unique<SmbclientInputStream>(uri, mutex,
std::move(ctx),
fd, st));
}
size_t
SmbclientInputStream::Read(std::unique_lock<Mutex> &,
void *ptr, size_t read_size)
{
ssize_t nbytes;
{
const ScopeUnlock unlock(mutex);
const std::lock_guard<Mutex> lock(smbclient_mutex);
nbytes = smbc_read(fd, ptr, read_size);
}
if (nbytes < 0)
throw MakeErrno("smbc_read() failed");
offset += nbytes;
return nbytes;
}
void
SmbclientInputStream::Seek(std::unique_lock<Mutex> &,
offset_type new_offset)
{
off_t result;
{
const ScopeUnlock unlock(mutex);
const std::lock_guard<Mutex> lock(smbclient_mutex);
result = smbc_lseek(fd, new_offset, SEEK_SET);
}
if (result < 0)
throw MakeErrno("smbc_lseek() failed");
offset = result;
}
static constexpr const char *smbclient_prefixes[] = {
"smb://",
nullptr
};
const InputPlugin input_plugin_smbclient = {
"smbclient",
smbclient_prefixes,
input_smbclient_init,
nullptr,
input_smbclient_open,
nullptr
};
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