diff options
Diffstat (limited to 'avfsd.c')
| -rw-r--r-- | avfsd.c | 367 |
1 files changed, 367 insertions, 0 deletions
@@ -0,0 +1,367 @@ +#include <fuse.h> +#include <virtual.h> + +#include <stdio.h> +#include <unistd.h> +#include <errno.h> +#include <fcntl.h> + +static int check_cred(struct fuse_cred *cred) +{ + if(cred->uid != getuid()) + return -EACCES; + else + return 0; +} + +static int avfs_getattr(struct fuse_cred *cred, const char *path, + struct stat *stbuf) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_lstat(path, stbuf); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_readlink(struct fuse_cred *cred, const char *path, char *buf, + size_t size) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_readlink(path, buf, size - 1); + if(res == -1) + return -errno; + + buf[res] = '\0'; + return 0; +} + + +static int avfs_getdir(struct fuse_cred *cred, const char *path, + fuse_dirh_t h, fuse_dirfil_t filler) +{ + DIR *dp; + struct dirent *de; + int res; + + res = check_cred(cred); + if(res) + return res; + + dp = virt_opendir(path); + if(dp == NULL) + return -errno; + + while((de = virt_readdir(dp)) != NULL) { + res = filler(h, de->d_name, de->d_type); + if(res != 0) + break; + } + + virt_closedir(dp); + return res; +} + +static int avfs_mknod(struct fuse_cred *cred, const char *path, mode_t mode, + dev_t rdev) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_mknod(path, mode, rdev); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_mkdir(struct fuse_cred *cred, const char *path, mode_t mode) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_mkdir(path, mode); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_unlink(struct fuse_cred *cred, const char *path) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_unlink(path); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_rmdir(struct fuse_cred *cred, const char *path) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_rmdir(path); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_symlink(struct fuse_cred *cred, const char *from, + const char *to) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_symlink(from, to); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_rename(struct fuse_cred *cred, const char *from, + const char *to) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_rename(from, to); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_link(struct fuse_cred *cred, const char *from, const char *to) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_link(from, to); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_chmod(struct fuse_cred *cred, const char *path, mode_t mode) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_chmod(path, mode); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_chown(struct fuse_cred *cred, const char *path, uid_t uid, + gid_t gid) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_lchown(path, uid, gid); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_truncate(struct fuse_cred *cred, const char *path, off_t size) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_truncate(path, size); + if(res == -1) + return -errno; + + return 0; +} + +static int avfs_utime(struct fuse_cred *cred, const char *path, + struct utimbuf *buf) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_utime(path, buf); + if(res == -1) + return -errno; + + return 0; +} + + +static int avfs_open(struct fuse_cred *cred, const char *path, int flags) +{ + int res; + + res = check_cred(cred); + if(res) + return res; + + res = virt_open(path, flags, 0); + if(res == -1) + return -errno; + + virt_close(res); + return 0; +} + +static int avfs_read(struct fuse_cred *cred, const char *path, char *buf, + size_t size, off_t offset) +{ + int fd; + int res; + + res = check_cred(cred); + if(res) + return res; + + fd = virt_open(path, O_RDONLY, 0); + if(fd == -1) + return -errno; + + res = virt_lseek(fd, offset, SEEK_SET); + if(res == -1) + res = -errno; + else { + res = virt_read(fd, buf, size); + if(res == -1) + res = -errno; + } + + virt_close(fd); + return res; +} + +static int avfs_write(struct fuse_cred *cred, const char *path, + const char *buf, size_t size, off_t offset) +{ + int fd; + int res; + + res = check_cred(cred); + if(res) + return res; + + fd = virt_open(path, O_WRONLY, 0); + if(fd == -1) + return -errno; + + res = virt_lseek(fd, offset, SEEK_SET); + if(res == -1) + res = -errno; + else { + res = virt_write(fd, buf, size); + if(res == -1) + res = -errno; + } + + virt_close(fd); + return res; +} + +static struct fuse_operations avfs_oper = { + getattr: avfs_getattr, + readlink: avfs_readlink, + getdir: avfs_getdir, + mknod: avfs_mknod, + mkdir: avfs_mkdir, + symlink: avfs_symlink, + unlink: avfs_unlink, + rmdir: avfs_rmdir, + rename: avfs_rename, + link: avfs_link, + chmod: avfs_chmod, + chown: avfs_chown, + truncate: avfs_truncate, + utime: avfs_utime, + open: avfs_open, + read: avfs_read, + write: avfs_write, +}; + + +void avfs_main(struct fuse *fuse) +{ + fuse_set_operations(fuse, &avfs_oper); + fuse_loop(fuse); +} + +#if 0 +int main(int argc, char *argv[]) +{ + int res; + const char *avfs_dir; + struct fuse *fuse; + + if(argc != 2) { + fprintf(stderr, "usage: %s mount_dir\n", argv[0]); + exit(1); + } + + avfs_dir = argv[1]; + + fuse = fuse_new(0); + res = fuse_mount(fuse, avfs_dir); + if(res == -1) + exit(1); + + avfs_main(fuse); + + return 0; +} +#endif |