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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 "SmbclientStorage.hxx"
#include "storage/StoragePlugin.hxx"
#include "storage/StorageInterface.hxx"
#include "storage/FileInfo.hxx"
#include "lib/smbclient/Init.hxx"
#include "lib/smbclient/Mutex.hxx"
#include "fs/Traits.hxx"
#include "thread/Mutex.hxx"
#include "system/Error.hxx"
#include "util/ASCII.hxx"
#include "util/StringCompare.hxx"
#include "util/ScopeExit.hxx"
#include <libsmbclient.h>
class SmbclientDirectoryReader final : public StorageDirectoryReader {
const std::string base;
const unsigned handle;
const char *name;
public:
SmbclientDirectoryReader(std::string &&_base, unsigned _handle)
:base(std::move(_base)), handle(_handle) {}
~SmbclientDirectoryReader() override;
/* virtual methods from class StorageDirectoryReader */
const char *Read() noexcept override;
StorageFileInfo GetInfo(bool follow) override;
};
class SmbclientStorage final : public Storage {
const std::string base;
SMBCCTX *const ctx;
public:
SmbclientStorage(const char *_base, SMBCCTX *_ctx)
:base(_base), ctx(_ctx) {}
~SmbclientStorage() override {
const std::lock_guard<Mutex> lock(smbclient_mutex);
smbc_free_context(ctx, 1);
}
/* virtual methods from class Storage */
StorageFileInfo GetInfo(const char *uri_utf8, bool follow) override;
std::unique_ptr<StorageDirectoryReader> OpenDirectory(const char *uri_utf8) override;
std::string MapUTF8(const char *uri_utf8) const noexcept override;
const char *MapToRelativeUTF8(const char *uri_utf8) const noexcept override;
};
std::string
SmbclientStorage::MapUTF8(const char *uri_utf8) const noexcept
{
assert(uri_utf8 != nullptr);
if (StringIsEmpty(uri_utf8))
return base;
return PathTraitsUTF8::Build(base.c_str(), uri_utf8);
}
const char *
SmbclientStorage::MapToRelativeUTF8(const char *uri_utf8) const noexcept
{
return PathTraitsUTF8::Relative(base.c_str(), uri_utf8);
}
static StorageFileInfo
GetInfo(const char *path)
{
struct stat st;
{
const std::lock_guard<Mutex> protect(smbclient_mutex);
if (smbc_stat(path, &st) != 0)
throw MakeErrno("Failed to access file");
}
StorageFileInfo info;
if (S_ISREG(st.st_mode))
info.type = StorageFileInfo::Type::REGULAR;
else if (S_ISDIR(st.st_mode))
info.type = StorageFileInfo::Type::DIRECTORY;
else
info.type = StorageFileInfo::Type::OTHER;
info.size = st.st_size;
info.mtime = std::chrono::system_clock::from_time_t(st.st_mtime);
info.device = st.st_dev;
info.inode = st.st_ino;
return info;
}
StorageFileInfo
SmbclientStorage::GetInfo(const char *uri_utf8, [[maybe_unused]] bool follow)
{
const std::string mapped = MapUTF8(uri_utf8);
return ::GetInfo(mapped.c_str());
}
std::unique_ptr<StorageDirectoryReader>
SmbclientStorage::OpenDirectory(const char *uri_utf8)
{
std::string mapped = MapUTF8(uri_utf8);
int handle;
{
const std::lock_guard<Mutex> protect(smbclient_mutex);
handle = smbc_opendir(mapped.c_str());
if (handle < 0)
throw MakeErrno("Failed to open directory");
}
return std::make_unique<SmbclientDirectoryReader>(std::move(mapped),
handle);
}
gcc_pure
static bool
SkipNameFS(const char *name) noexcept
{
return name[0] == '.' &&
(name[1] == 0 ||
(name[1] == '.' && name[2] == 0));
}
SmbclientDirectoryReader::~SmbclientDirectoryReader()
{
const std::lock_guard<Mutex> lock(smbclient_mutex);
smbc_close(handle);
}
const char *
SmbclientDirectoryReader::Read() noexcept
{
const std::lock_guard<Mutex> protect(smbclient_mutex);
struct smbc_dirent *e;
while ((e = smbc_readdir(handle)) != nullptr) {
name = e->name;
if (!SkipNameFS(name))
return name;
}
return nullptr;
}
StorageFileInfo
SmbclientDirectoryReader::GetInfo([[maybe_unused]] bool follow)
{
const std::string path = PathTraitsUTF8::Build(base.c_str(), name);
return ::GetInfo(path.c_str());
}
static std::unique_ptr<Storage>
CreateSmbclientStorageURI([[maybe_unused]] EventLoop &event_loop, const char *base)
{
if (!StringStartsWithCaseASCII(base, "smb://"))
return nullptr;
SmbclientInit();
const std::lock_guard<Mutex> protect(smbclient_mutex);
SMBCCTX *ctx = smbc_new_context();
if (ctx == nullptr)
throw MakeErrno("smbc_new_context() failed");
SMBCCTX *ctx2 = smbc_init_context(ctx);
if (ctx2 == nullptr) {
AtScopeExit(ctx) { smbc_free_context(ctx, 1); };
throw MakeErrno("smbc_new_context() failed");
}
return std::make_unique<SmbclientStorage>(base, ctx2);
}
const StoragePlugin smbclient_storage_plugin = {
"smbclient",
CreateSmbclientStorageURI,
};
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