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115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
/*****************************************************************************
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* Author: Valient Gough <vgough@pobox.com>
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*
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*****************************************************************************
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* Copyright (c) 2003, Valient Gough
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _FileNode_incl_
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#define _FileNode_incl_
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#include <atomic>
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#include <inttypes.h>
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#include <memory>
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#include <pthread.h>
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#include <stdint.h>
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#include <string>
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#include <sys/types.h>
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#include "CipherKey.h"
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#include "FSConfig.h"
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#include "FileUtils.h"
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#include "encfs.h"
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#define CANARY_OK 0x46040975
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#define CANARY_RELEASED 0x70c5610d
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#define CANARY_DESTROYED 0x52cdad90
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namespace encfs {
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class Cipher;
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class DirNode;
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class FileIO;
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class FileNode {
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public:
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FileNode(DirNode *parent, const FSConfigPtr &cfg, const char *plaintextName,
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const char *cipherName, uint64_t fuseFh);
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~FileNode();
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// Use an atomic type. The canary is accessed without holding any
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// locks.
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std::atomic<std::uint32_t> canary;
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// FUSE file handle that is passed to the kernel
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uint64_t fuseFh;
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const char *plaintextName() const;
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const char *cipherName() const;
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// directory portion of plaintextName
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std::string plaintextParent() const;
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// if setIVFirst is true, then the IV is changed before the name is changed
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// (default). The reverse is also supported for special cases..
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bool setName(const char *plaintextName, const char *cipherName, uint64_t iv,
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bool setIVFirst = true);
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// create node
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// If uid/gid are not 0, then chown is used change ownership as specified
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int mknod(mode_t mode, dev_t rdev, uid_t uid = 0, gid_t gid = 0);
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// Returns < 0 on error (-errno), file descriptor on success.
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int open(int flags) const;
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// getAttr returns 0 on success, -errno on failure
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int getAttr(struct stat *stbuf) const;
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off_t getSize() const;
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ssize_t read(off_t offset, unsigned char *data, size_t size) const;
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ssize_t write(off_t offset, unsigned char *data, size_t size);
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// truncate the file to a particular size
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int truncate(off_t size);
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// datasync or full sync
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int sync(bool dataSync);
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private:
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// doing locking at the FileNode level isn't as efficient as at the
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// lowest level of RawFileIO, since that means locks are held longer
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// (held during CPU intensive crypto operations!). However it makes it
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// easier to avoid any race conditions with operations such as
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// truncate() which may result in multiple calls down to the FileIO
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// level.
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mutable pthread_mutex_t mutex;
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FSConfigPtr fsConfig;
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std::shared_ptr<FileIO> io;
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std::string _pname; // plaintext name
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std::string _cname; // encrypted name
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DirNode *parent;
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private:
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FileNode(const FileNode &src);
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FileNode &operator=(const FileNode &src);
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};
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} // namespace encfs
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#endif
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