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/*
* Copyright (C) 2003-2014 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 "config.h"
#include "NfsStorage.hxx"
#include "storage/StoragePlugin.hxx"
#include "storage/StorageInterface.hxx"
#include "storage/FileInfo.hxx"
#include "lib/nfs/Domain.hxx"
#include "util/Error.hxx"
#include "thread/Mutex.hxx"
extern "C" {
#include <nfsc/libnfs.h>
#include <nfsc/libnfs-raw-nfs.h>
}
#include <sys/stat.h>
#include <fcntl.h>
class NfsDirectoryReader final : public StorageDirectoryReader {
const std::string base;
nfs_context *ctx;
nfsdir *dir;
nfsdirent *ent;
public:
NfsDirectoryReader(const char *_base, nfs_context *_ctx, nfsdir *_dir)
:base(_base), ctx(_ctx), dir(_dir) {}
virtual ~NfsDirectoryReader();
/* virtual methods from class StorageDirectoryReader */
virtual const char *Read() override;
virtual bool GetInfo(bool follow, FileInfo &info,
Error &error) override;
};
class NfsStorage final : public Storage {
const std::string base;
nfs_context *ctx;
public:
NfsStorage(const char *_base, nfs_context *_ctx)
:base(_base), ctx(_ctx) {}
virtual ~NfsStorage() {
nfs_destroy_context(ctx);
}
/* virtual methods from class Storage */
virtual bool GetInfo(const char *uri_utf8, bool follow, FileInfo &info,
Error &error) override;
virtual StorageDirectoryReader *OpenDirectory(const char *uri_utf8,
Error &error) override;
virtual std::string MapUTF8(const char *uri_utf8) const override;
virtual const char *MapToRelativeUTF8(const char *uri_utf8) const override;
};
std::string
NfsStorage::MapUTF8(const char *uri_utf8) const
{
assert(uri_utf8 != nullptr);
if (*uri_utf8 == 0)
return base;
return PathTraitsUTF8::Build(base.c_str(), uri_utf8);
}
const char *
NfsStorage::MapToRelativeUTF8(const char *uri_utf8) const
{
return PathTraitsUTF8::Relative(base.c_str(), uri_utf8);
}
static bool
GetInfo(nfs_context *ctx, const char *path, FileInfo &info, Error &error)
{
struct stat st;
int result = nfs_stat(ctx, path, &st);
if (result < 0) {
error.SetErrno(-result, "nfs_stat() failed");
return false;
}
if (S_ISREG(st.st_mode))
info.type = FileInfo::Type::REGULAR;
else if (S_ISDIR(st.st_mode))
info.type = FileInfo::Type::DIRECTORY;
else
info.type = FileInfo::Type::OTHER;
info.size = st.st_size;
info.mtime = st.st_mtime;
info.device = st.st_dev;
info.inode = st.st_ino;
return true;
}
bool
NfsStorage::GetInfo(const char *uri_utf8, gcc_unused bool follow,
FileInfo &info, Error &error)
{
/* libnfs paths must begin with a slash */
std::string path(uri_utf8);
path.insert(path.begin(), '/');
return ::GetInfo(ctx, path.c_str(), info, error);
}
StorageDirectoryReader *
NfsStorage::OpenDirectory(const char *uri_utf8, Error &error)
{
/* libnfs paths must begin with a slash */
std::string path(uri_utf8);
path.insert(path.begin(), '/');
nfsdir *dir;
int result = nfs_opendir(ctx, path.c_str(), &dir);
if (result < 0) {
error.SetErrno(-result, "nfs_opendir() failed");
return nullptr;
}
return new NfsDirectoryReader(uri_utf8, ctx, dir);
}
gcc_pure
static bool
SkipNameFS(const char *name)
{
return name[0] == '.' &&
(name[1] == 0 ||
(name[1] == '.' && name[2] == 0));
}
NfsDirectoryReader::~NfsDirectoryReader()
{
nfs_closedir(ctx, dir);
}
const char *
NfsDirectoryReader::Read()
{
while ((ent = nfs_readdir(ctx, dir)) != nullptr) {
if (!SkipNameFS(ent->name))
return ent->name;
}
return nullptr;
}
bool
NfsDirectoryReader::GetInfo(gcc_unused bool follow, FileInfo &info,
gcc_unused Error &error)
{
assert(ent != nullptr);
switch (ent->type) {
case NF3REG:
info.type = FileInfo::Type::REGULAR;
break;
case NF3DIR:
info.type = FileInfo::Type::DIRECTORY;
break;
default:
info.type = FileInfo::Type::OTHER;
break;
}
info.size = ent->size;
info.mtime = ent->mtime.tv_sec;
info.device = 0;
info.inode = ent->inode;
return true;
}
static Storage *
CreateNfsStorageURI(const char *base, Error &error)
{
if (memcmp(base, "nfs://", 6) != 0)
return nullptr;
const char *p = base + 6;
const char *mount = strchr(p, '/');
if (mount == nullptr) {
error.Set(nfs_domain, "Malformed nfs:// URI");
return nullptr;
}
const std::string server(p, mount);
nfs_context *ctx = nfs_init_context();
if (ctx == nullptr) {
error.Set(nfs_domain, "nfs_init_context() failed");
return nullptr;
}
int result = nfs_mount(ctx, server.c_str(), mount);
if (result < 0) {
nfs_destroy_context(ctx);
error.SetErrno(-result, "nfs_mount() failed");
return nullptr;
}
return new NfsStorage(base, ctx);
}
const StoragePlugin nfs_storage_plugin = {
"nfs",
CreateNfsStorageURI,
};
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