mirror of
https://github.com/winfsp/winfsp.git
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347 lines
8.4 KiB
C
347 lines
8.4 KiB
C
/**
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* @file passthrough-fuse.c
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*
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* @copyright 2015-2017 Bill Zissimopoulos
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*/
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/*
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* This file is part of WinFsp.
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*
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* You can redistribute it and/or modify it under the terms of the GNU
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* General Public License version 3 as published by the Free Software
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* Foundation.
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*
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* Licensees holding a valid commercial license may use this file in
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* accordance with the commercial license agreement provided with the
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* software.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fuse.h>
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#if defined(_WIN64) || defined(_WIN32)
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#include "winposix.h"
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#else
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#include <dirent.h>
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#include <unistd.h>
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#endif
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#define FSNAME "passthrough"
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#define PROGNAME "passthrough-fuse"
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#define concat_path(ptfs, fn, fp) (sizeof fp > (unsigned)snprintf(fp, sizeof fp, "%s%s", ptfs->rootdir, fn))
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#define fi_dirbit (0x8000000000000000ULL)
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#define fi_fh(fi, MASK) ((fi)->fh & (MASK))
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#define fi_setfh(fi, FH, MASK) ((fi)->fh = (intptr_t)(FH) | (MASK))
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#define fi_fd(fi) (fi_fh(fi, fi_dirbit) ? \
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dirfd((DIR *)fi_fh(fi, ~fi_dirbit)) : (int)fi_fh(fi, ~fi_dirbit))
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#define fi_dirp(fi) ((DIR *)fi_fh(fi, ~fi_dirbit))
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#define fi_setfd(fi, fd) (fi_setfh(fi, fd, 0))
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#define fi_setdirp(fi, dirp) (fi_setfh(fi, dirp, fi_dirbit))
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#define ptfs_impl_fullpath(n) \
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char full ## n[PATH_MAX]; \
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if (!concat_path(((PTFS *)fuse_get_context()->private_data), n, full ## n))\
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return -ENAMETOOLONG; \
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n = full ## n
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typedef struct
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{
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const char *rootdir;
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} PTFS;
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static int ptfs_getattr(const char *path, struct fuse_stat *stbuf)
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{
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ptfs_impl_fullpath(path);
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return -1 != lstat(path, stbuf) ? 0 : -errno;
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}
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static int ptfs_mkdir(const char *path, fuse_mode_t mode)
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{
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ptfs_impl_fullpath(path);
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return -1 != mkdir(path, mode) ? 0 : -errno;
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}
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static int ptfs_unlink(const char *path)
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{
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ptfs_impl_fullpath(path);
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return -1 != unlink(path) ? 0 : -errno;
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}
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static int ptfs_rmdir(const char *path)
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{
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ptfs_impl_fullpath(path);
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return -1 != rmdir(path) ? 0 : -errno;
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}
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static int ptfs_rename(const char *oldpath, const char *newpath)
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{
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ptfs_impl_fullpath(newpath);
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ptfs_impl_fullpath(oldpath);
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return -1 != rename(oldpath, newpath) ? 0 : -errno;
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}
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static int ptfs_chmod(const char *path, fuse_mode_t mode)
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{
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ptfs_impl_fullpath(path);
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return -1 != chmod(path, mode) ? 0 : -errno;
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}
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static int ptfs_chown(const char *path, fuse_uid_t uid, fuse_gid_t gid)
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{
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ptfs_impl_fullpath(path);
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return -1 != lchown(path, uid, gid) ? 0 : -errno;
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}
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static int ptfs_truncate(const char *path, fuse_off_t size)
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{
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ptfs_impl_fullpath(path);
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return -1 != truncate(path, size) ? 0 : -errno;
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}
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static int ptfs_utime(const char *path, struct fuse_utimbuf *timbuf)
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{
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ptfs_impl_fullpath(path);
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return -1 != utime(path, timbuf) ? 0 : -errno;
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}
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static int ptfs_open(const char *path, struct fuse_file_info *fi)
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{
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ptfs_impl_fullpath(path);
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int fd;
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return -1 != (fd = open(path, fi->flags)) ? (fi_setfd(fi, fd), 0) : -errno;
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}
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static int ptfs_read(const char *path, char *buf, size_t size, fuse_off_t off,
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struct fuse_file_info *fi)
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{
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int fd = fi_fd(fi);
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int nb;
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return -1 != (nb = pread(fd, buf, size, off)) ? nb : -errno;
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}
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static int ptfs_write(const char *path, const char *buf, size_t size, fuse_off_t off,
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struct fuse_file_info *fi)
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{
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int fd = fi_fd(fi);
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int nb;
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return -1 != (nb = pwrite(fd, buf, size, off)) ? nb : -errno;
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}
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static int ptfs_statfs(const char *path, struct fuse_statvfs *stbuf)
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{
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ptfs_impl_fullpath(path);
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return -1 != statvfs(path, stbuf) ? 0 : -errno;
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}
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static int ptfs_release(const char *path, struct fuse_file_info *fi)
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{
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int fd = fi_fd(fi);
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close(fd);
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return 0;
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}
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static int ptfs_fsync(const char *path, int datasync, struct fuse_file_info *fi)
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{
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int fd = fi_fd(fi);
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return -1 != fsync(fd) ? 0 : -errno;
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}
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static int ptfs_opendir(const char *path, struct fuse_file_info *fi)
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{
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ptfs_impl_fullpath(path);
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DIR *dirp;
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return 0 != (dirp = opendir(path)) ? (fi_setdirp(fi, dirp), 0) : -errno;
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}
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static int ptfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, fuse_off_t off,
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struct fuse_file_info *fi)
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{
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DIR *dirp = fi_dirp(fi);
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struct dirent *de;
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rewinddir(dirp);
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for (;;)
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{
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errno = 0;
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if (0 == (de = readdir(dirp)))
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break;
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#if defined(_WIN64) || defined(_WIN32)
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if (0 != filler(buf, de->d_name, &de->d_stat, 0))
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#else
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if (0 != filler(buf, de->d_name, 0, 0))
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#endif
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return -ENOMEM;
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}
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return -errno;
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}
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static int ptfs_releasedir(const char *path, struct fuse_file_info *fi)
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{
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DIR *dirp = fi_dirp(fi);
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return -1 != closedir(dirp) ? 0 : -errno;
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}
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static void *ptfs_init(struct fuse_conn_info *conn)
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{
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#if defined(_WIN64) || defined(_WIN32)
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#if defined(FSP_FUSE_CAP_READDIR_PLUS)
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conn->want |= (conn->capable & FSP_FUSE_CAP_READDIR_PLUS);
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#endif
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#if defined(FSP_FUSE_CAP_CASE_INSENSITIVE)
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conn->want |= (conn->capable & FSP_FUSE_CAP_CASE_INSENSITIVE);
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#endif
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#endif
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return fuse_get_context()->private_data;
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}
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static int ptfs_create(const char *path, fuse_mode_t mode, struct fuse_file_info *fi)
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{
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ptfs_impl_fullpath(path);
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int fd;
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return -1 != (fd = open(path, fi->flags, mode)) ? (fi_setfd(fi, fd), 0) : -errno;
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}
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static int ptfs_ftruncate(const char *path, fuse_off_t off, struct fuse_file_info *fi)
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{
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int fd = fi_fd(fi);
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return -1 != ftruncate(fd, off) ? 0 : -errno;
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}
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static int ptfs_fgetattr(const char *path, struct fuse_stat *stbuf, struct fuse_file_info *fi)
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{
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int fd = fi_fd(fi);
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return -1 != fstat(fd, stbuf) ? 0 : -errno;
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}
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static struct fuse_operations ptfs_ops =
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{
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ptfs_getattr,
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0, //getdir
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0, //readlink
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0, //mknod
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ptfs_mkdir,
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ptfs_unlink,
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ptfs_rmdir,
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0, //symlink
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ptfs_rename,
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0, //link
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ptfs_chmod,
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ptfs_chown,
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ptfs_truncate,
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ptfs_utime,
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ptfs_open,
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ptfs_read,
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ptfs_write,
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ptfs_statfs,
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0, //flush
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ptfs_release,
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ptfs_fsync,
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0, //setxattr
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0, //getxattr
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0, //listxattr
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0, //removexattr
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ptfs_opendir,
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ptfs_readdir,
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ptfs_releasedir,
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0, //fsyncdir
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ptfs_init,
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0, //destroy
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0, //access
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ptfs_create,
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ptfs_ftruncate,
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ptfs_fgetattr,
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};
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static void usage(void)
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{
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fprintf(stderr, "usage: " PROGNAME " [FUSE options] rootdir mountpoint\n");
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exit(2);
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}
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int main(int argc, char *argv[])
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{
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PTFS ptfs = { 0 };
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if (3 <= argc && '-' != argv[argc - 2][0] && '-' != argv[argc - 1][0])
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{
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ptfs.rootdir = realpath(argv[argc - 2], 0); /* memory freed at process end */
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argv[argc - 2] = argv[argc - 1];
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argc--;
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}
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#if defined(_WIN64) || defined(_WIN32)
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/*
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* When building for Windows (rather than Cygwin or POSIX OS)
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* allow the path to be specified using the --VolumePrefix
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* switch using the syntax \\passthrough-fuse\C$\Path. This
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* allows us to run the file system under the WinFsp.Launcher
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* and start it using commands like:
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*
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* net use z: \\passthrough-fuse\C$\Path
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*/
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if (0 == ptfs.rootdir)
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for (int argi = 1; argc > argi; argi++)
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{
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int strncmp(const char *a, const char *b, size_t length);
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char *strchr(const char *s, int c);
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char *p = 0;
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if (0 == strncmp("--UNC=", argv[argi], sizeof "--UNC=" - 1))
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p = argv[argi] + sizeof "--UNC=" - 1;
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else if (0 == strncmp("--VolumePrefix=", argv[argi], sizeof "--VolumePrefix=" - 1))
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p = argv[argi] + sizeof "--VolumePrefix=" - 1;
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if (0 != p && '\\' != p[1])
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{
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p = strchr(p + 1, '\\');
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if (0 != p &&
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(
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('A' <= p[1] && p[1] <= 'Z') ||
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('a' <= p[1] && p[1] <= 'z')
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) &&
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'$' == p[2])
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{
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p[2] = ':';
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ptfs.rootdir = realpath(p + 1, 0); /* memory freed at process end */
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p[2] = '$';
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break;
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}
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}
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}
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#endif
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if (0 == ptfs.rootdir)
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usage();
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return fuse_main(argc, argv, &ptfs_ops, &ptfs);
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}
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