diff options
Diffstat (limited to 'source/smbd/vfs-wrap.c')
| -rw-r--r-- | source/smbd/vfs-wrap.c | 741 |
1 files changed, 741 insertions, 0 deletions
diff --git a/source/smbd/vfs-wrap.c b/source/smbd/vfs-wrap.c new file mode 100644 index 00000000000..50cf42e248f --- /dev/null +++ b/source/smbd/vfs-wrap.c @@ -0,0 +1,741 @@ +/* + Unix SMB/CIFS implementation. + Wrap disk only vfs functions to sidestep dodgy compilers. + Copyright (C) Tim Potter 1998 + + 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., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" + +/* Check for NULL pointer parameters in vfswrap_* functions */ + +#define VFS_CHECK_NULL + +/* We don't want to have NULL function pointers lying around. Someone + is sure to try and execute them. These stubs are used to prevent + this possibility. */ + +int vfswrap_dummy_connect(connection_struct *conn, const char *service, const char *user) +{ + return 0; /* Return >= 0 for success */ +} + +void vfswrap_dummy_disconnect(connection_struct *conn) +{ +} + +/* Disk operations */ + +SMB_BIG_UINT vfswrap_disk_free(connection_struct *conn, const char *path, BOOL small_query, SMB_BIG_UINT *bsize, + SMB_BIG_UINT *dfree, SMB_BIG_UINT *dsize) +{ + SMB_BIG_UINT result; + +#ifdef VFS_CHECK_NULL + if ((path == NULL) || (bsize == NULL) || (dfree == NULL) || + (dsize == NULL)) { + + smb_panic("NULL pointer passed to vfswrap_disk_free() function\n"); + } +#endif + + result = sys_disk_free(path, small_query, bsize, dfree, dsize); + return result; +} + +/* Directory operations */ + +DIR *vfswrap_opendir(connection_struct *conn, const char *fname) +{ + DIR *result; + + START_PROFILE(syscall_opendir); + +#ifdef VFS_CHECK_NULL + if (fname == NULL) { + smb_panic("NULL pointer passed to vfswrap_opendir()\n"); + } +#endif + + result = opendir(fname); + END_PROFILE(syscall_opendir); + return result; +} + +struct dirent *vfswrap_readdir(connection_struct *conn, DIR *dirp) +{ + struct dirent *result; + + START_PROFILE(syscall_readdir); + +#ifdef VFS_CHECK_NULL + if (dirp == NULL) { + smb_panic("NULL pointer passed to vfswrap_readdir()\n"); + } +#endif + + result = readdir(dirp); + END_PROFILE(syscall_readdir); + return result; +} + +int vfswrap_mkdir(connection_struct *conn, const char *path, mode_t mode) +{ + int result; + + START_PROFILE(syscall_mkdir); + +#ifdef VFS_CHECK_NULL + if (path == NULL) { + smb_panic("NULL pointer passed to vfswrap_mkdir()\n"); + } +#endif + + result = mkdir(path, mode); + + if (result == 0) { + /* + * We need to do this as the default behavior of POSIX ACLs + * is to set the mask to be the requested group permission + * bits, not the group permission bits to be the requested + * group permission bits. This is not what we want, as it will + * mess up any inherited ACL bits that were set. JRA. + */ + int saved_errno = errno; /* We may get ENOSYS */ + if (conn->vfs_ops.chmod_acl != NULL) { + if ((conn->vfs_ops.chmod_acl(conn, path, mode) == -1) && (errno == ENOSYS)) + errno = saved_errno; + } + } + + END_PROFILE(syscall_mkdir); + return result; +} + +int vfswrap_rmdir(connection_struct *conn, const char *path) +{ + int result; + + START_PROFILE(syscall_rmdir); + +#ifdef VFS_CHECK_NULL + if (path == NULL) { + smb_panic("NULL pointer passed to vfswrap_rmdir()\n"); + } +#endif + + result = rmdir(path); + END_PROFILE(syscall_rmdir); + return result; +} + +int vfswrap_closedir(connection_struct *conn, DIR *dirp) +{ + int result; + + START_PROFILE(syscall_closedir); + +#ifdef VFS_CHECK_NULL + if (dirp == NULL) { + smb_panic("NULL pointer passed to vfswrap_closedir()\n"); + } +#endif + + result = closedir(dirp); + END_PROFILE(syscall_closedir); + return result; +} + +/* File operations */ + +int vfswrap_open(connection_struct *conn, const char *fname, int flags, mode_t mode) +{ + int result; + + START_PROFILE(syscall_open); + +#ifdef VFS_CHECK_NULL + if (fname == NULL) { + smb_panic("NULL pointer passed to vfswrap_open()\n"); + } +#endif + + result = sys_open(fname, flags, mode); + END_PROFILE(syscall_open); + return result; +} + +int vfswrap_close(files_struct *fsp, int fd) +{ + int result; + + START_PROFILE(syscall_close); + + result = close(fd); + END_PROFILE(syscall_close); + return result; +} + +ssize_t vfswrap_read(files_struct *fsp, int fd, void *data, size_t n) +{ + ssize_t result; + + START_PROFILE_BYTES(syscall_read, n); + +#ifdef VFS_CHECK_NULL + if (data == NULL) { + smb_panic("NULL pointer passed to vfswrap_read()\n"); + } +#endif + + result = read(fd, data, n); + END_PROFILE(syscall_read); + return result; +} + +ssize_t vfswrap_write(files_struct *fsp, int fd, const void *data, size_t n) +{ + ssize_t result; + + START_PROFILE_BYTES(syscall_write, n); + +#ifdef VFS_CHECK_NULL + if (data == NULL) { + smb_panic("NULL pointer passed to vfswrap_write()\n"); + } +#endif + + result = write(fd, data, n); + END_PROFILE(syscall_write); + return result; +} + +SMB_OFF_T vfswrap_lseek(files_struct *fsp, int filedes, SMB_OFF_T offset, int whence) +{ + SMB_OFF_T result; + + START_PROFILE(syscall_lseek); + + result = sys_lseek(filedes, offset, whence); + END_PROFILE(syscall_lseek); + return result; +} + +int vfswrap_rename(connection_struct *conn, const char *old, const char *new) +{ + int result; + + START_PROFILE(syscall_rename); + +#ifdef VFS_CHECK_NULL + if ((old == NULL) || (new == NULL)) { + smb_panic("NULL pointer passed to vfswrap_rename()\n"); + } +#endif + + result = rename(old, new); + END_PROFILE(syscall_rename); + return result; +} + +int vfswrap_fsync(files_struct *fsp, int fd) +{ +#ifdef HAVE_FSYNC + int result; + + START_PROFILE(syscall_fsync); + + result = fsync(fd); + END_PROFILE(syscall_fsync); + return result; +#else + return 0; +#endif +} + +int vfswrap_stat(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *sbuf) +{ + int result; + + START_PROFILE(syscall_stat); + +#ifdef VFS_CHECK_NULL + if ((fname == NULL) || (sbuf == NULL)) { + smb_panic("NULL pointer passed to vfswrap_stat()\n"); + } +#endif + + result = sys_stat(fname, sbuf); + END_PROFILE(syscall_stat); + return result; +} + +int vfswrap_fstat(files_struct *fsp, int fd, SMB_STRUCT_STAT *sbuf) +{ + int result; + + START_PROFILE(syscall_fstat); + +#ifdef VFS_CHECK_NULL + if (sbuf == NULL) { + smb_panic("NULL pointer passed to vfswrap_fstat()\n"); + } +#endif + + result = sys_fstat(fd, sbuf); + END_PROFILE(syscall_fstat); + return result; +} + +int vfswrap_lstat(connection_struct *conn, const char *path, SMB_STRUCT_STAT *sbuf) +{ + int result; + + START_PROFILE(syscall_lstat); + +#ifdef VFS_CHECK_NULL + if ((path == NULL) || (sbuf == NULL)) { + smb_panic("NULL pointer passed to vfswrap_lstat()\n"); + } +#endif + + result = sys_lstat(path, sbuf); + END_PROFILE(syscall_lstat); + return result; +} + +int vfswrap_unlink(connection_struct *conn, const char *path) +{ + int result; + + START_PROFILE(syscall_unlink); + +#ifdef VFS_CHECK_NULL + if (path == NULL) { + smb_panic("NULL pointer passed to vfswrap_unlink()\n"); + } +#endif + + result = unlink(path); + END_PROFILE(syscall_unlink); + return result; +} + +int vfswrap_chmod(connection_struct *conn, const char *path, mode_t mode) +{ + int result; + + START_PROFILE(syscall_chmod); + +#ifdef VFS_CHECK_NULL + if (path == NULL) { + smb_panic("NULL pointer passed to vfswrap_chmod()\n"); + } +#endif + + /* + * We need to do this due to the fact that the default POSIX ACL + * chmod modifies the ACL *mask* for the group owner, not the + * group owner bits directly. JRA. + */ + + + if (conn->vfs_ops.chmod_acl != NULL) { + int saved_errno = errno; /* We might get ENOSYS */ + if ((result = conn->vfs_ops.chmod_acl(conn, path, mode)) == 0) { + END_PROFILE(syscall_chmod); + return result; + } + /* Error - return the old errno. */ + errno = saved_errno; + } + + result = chmod(path, mode); + END_PROFILE(syscall_chmod); + return result; +} + +int vfswrap_fchmod(files_struct *fsp, int fd, mode_t mode) +{ + int result; + struct vfs_ops *vfs_ops = &fsp->conn->vfs_ops; + + START_PROFILE(syscall_fchmod); + + /* + * We need to do this due to the fact that the default POSIX ACL + * chmod modifies the ACL *mask* for the group owner, not the + * group owner bits directly. JRA. + */ + + if (vfs_ops->fchmod_acl != NULL) { + int saved_errno = errno; /* We might get ENOSYS */ + if ((result = vfs_ops->fchmod_acl(fsp, fd, mode)) == 0) { + END_PROFILE(syscall_chmod); + return result; + } + /* Error - return the old errno. */ + errno = saved_errno; + } + + result = fchmod(fd, mode); + END_PROFILE(syscall_fchmod); + return result; +} + +int vfswrap_chown(connection_struct *conn, const char *path, uid_t uid, gid_t gid) +{ + int result; + + START_PROFILE(syscall_chown); + +#ifdef VFS_CHECK_NULL + if (path == NULL) { + smb_panic("NULL pointer passed to vfswrap_chown()\n"); + } +#endif + + result = sys_chown(path, uid, gid); + END_PROFILE(syscall_chown); + return result; +} + +int vfswrap_fchown(files_struct *fsp, int fd, uid_t uid, gid_t gid) +{ + int result; + + START_PROFILE(syscall_fchown); + + result = fchown(fd, uid, gid); + END_PROFILE(syscall_fchown); + return result; +} + +int vfswrap_chdir(connection_struct *conn, const char *path) +{ + int result; + + START_PROFILE(syscall_chdir); + +#ifdef VFS_CHECK_NULL + if (path == NULL) { + smb_panic("NULL pointer passed to vfswrap_chdir()\n"); + } +#endif + + result = chdir(path); + END_PROFILE(syscall_chdir); + return result; +} + +char *vfswrap_getwd(connection_struct *conn, char *path) +{ + char *result; + + START_PROFILE(syscall_getwd); + +#ifdef VFS_CHECK_NULL + if (path == NULL) { + smb_panic("NULL pointer passed to vfswrap_getwd()\n"); + } +#endif + + result = sys_getwd(path); + END_PROFILE(syscall_getwd); + return result; +} + +int vfswrap_utime(connection_struct *conn, const char *path, struct utimbuf *times) +{ + int result; + + START_PROFILE(syscall_utime); + +#ifdef VFS_CHECK_NULL + if ((path == NULL) || (times == NULL)) { + smb_panic("NULL pointer passed to vfswrap_utime()\n"); + } +#endif + + result = utime(path, times); + END_PROFILE(syscall_utime); + return result; +} + +/********************************************************************* + A version of ftruncate that will write the space on disk if strict + allocate is set. +**********************************************************************/ + +static int strict_allocate_ftruncate(files_struct *fsp, int fd, SMB_OFF_T len) +{ + struct vfs_ops *vfs_ops = &fsp->conn->vfs_ops; + SMB_STRUCT_STAT st; + SMB_OFF_T currpos = vfs_ops->lseek(fsp, fd, 0, SEEK_CUR); + unsigned char zero_space[4096]; + SMB_OFF_T space_to_write = len - st.st_size; + + if (currpos == -1) + return -1; + + if (vfs_ops->fstat(fsp, fd, &st) == -1) + return -1; + +#ifdef S_ISFIFO + if (S_ISFIFO(st.st_mode)) + return 0; +#endif + + if (st.st_size == len) + return 0; + + /* Shrink - just ftruncate. */ + if (st.st_size > len) + return sys_ftruncate(fd, len); + + /* Write out the real space on disk. */ + if (vfs_ops->lseek(fsp, fd, st.st_size, SEEK_SET) != st.st_size) + return -1; + + space_to_write = len - st.st_size; + + memset(zero_space, '\0', sizeof(zero_space)); + while ( space_to_write > 0) { + SMB_OFF_T retlen; + SMB_OFF_T current_len_to_write = MIN(sizeof(zero_space),space_to_write); + + retlen = vfs_ops->write(fsp,fsp->fd,(char *)zero_space,current_len_to_write); + if (retlen <= 0) + return -1; + + space_to_write -= retlen; + } + + /* Seek to where we were */ + if (vfs_ops->lseek(fsp, fd, currpos, SEEK_SET) != currpos) + return -1; + + return 0; +} + +int vfswrap_ftruncate(files_struct *fsp, int fd, SMB_OFF_T len) +{ + int result = -1; + struct vfs_ops *vfs_ops = &fsp->conn->vfs_ops; + SMB_STRUCT_STAT st; + char c = 0; + SMB_OFF_T currpos; + + START_PROFILE(syscall_ftruncate); + + if (lp_strict_allocate(SNUM(fsp->conn))) { + result = strict_allocate_ftruncate(fsp, fd, len); + END_PROFILE(syscall_ftruncate); + return result; + } + + /* we used to just check HAVE_FTRUNCATE_EXTEND and only use + sys_ftruncate if the system supports it. Then I discovered that + you can have some filesystems that support ftruncate + expansion and some that don't! On Linux fat can't do + ftruncate extend but ext2 can. */ + + result = sys_ftruncate(fd, len); + if (result == 0) + goto done; + + /* According to W. R. Stevens advanced UNIX prog. Pure 4.3 BSD cannot + extend a file with ftruncate. Provide alternate implementation + for this */ + currpos = vfs_ops->lseek(fsp, fd, 0, SEEK_CUR); + if (currpos == -1) { + goto done; + } + + /* Do an fstat to see if the file is longer than the requested + size in which case the ftruncate above should have + succeeded or shorter, in which case seek to len - 1 and + write 1 byte of zero */ + if (vfs_ops->fstat(fsp, fd, &st) == -1) { + goto done; + } + +#ifdef S_ISFIFO + if (S_ISFIFO(st.st_mode)) { + result = 0; + goto done; + } +#endif + + if (st.st_size == len) { + result = 0; + goto done; + } + + if (st.st_size > len) { + /* the sys_ftruncate should have worked */ + goto done; + } + + if (vfs_ops->lseek(fsp, fd, len-1, SEEK_SET) != len -1) + goto done; + + if (vfs_ops->write(fsp, fd, &c, 1)!=1) + goto done; + + /* Seek to where we were */ + if (vfs_ops->lseek(fsp, fd, currpos, SEEK_SET) != currpos) + goto done; + result = 0; + + done: + + END_PROFILE(syscall_ftruncate); + return result; +} + +BOOL vfswrap_lock(files_struct *fsp, int fd, int op, SMB_OFF_T offset, SMB_OFF_T count, int type) +{ + BOOL result; + + START_PROFILE(syscall_fcntl_lock); + + result = fcntl_lock(fd, op, offset, count,type); + END_PROFILE(syscall_fcntl_lock); + return result; +} + +int vfswrap_symlink(connection_struct *conn, const char *oldpath, const char *newpath) +{ + int result; + + START_PROFILE(syscall_symlink); + +#ifdef VFS_CHECK_NULL + if ((oldpath == NULL) || (newpath == NULL)) + smb_panic("NULL pointer passed to vfswrap_symlink()\n"); +#endif + + result = sys_symlink(oldpath, newpath); + END_PROFILE(syscall_symlink); + return result; +} + +int vfswrap_readlink(connection_struct *conn, const char *path, char *buf, size_t bufsiz) +{ + int result; + + START_PROFILE(syscall_readlink); + +#ifdef VFS_CHECK_NULL + if ((path == NULL) || (buf == NULL)) + smb_panic("NULL pointer passed to vfswrap_readlink()\n"); +#endif + + result = sys_readlink(path, buf, bufsiz); + END_PROFILE(syscall_readlink); + return result; +} + +int vfswrap_link(connection_struct *conn, const char *oldpath, const char *newpath) +{ + int result; + + START_PROFILE(syscall_link); + +#ifdef VFS_CHECK_NULL + if ((oldpath == NULL) || (newpath == NULL)) + smb_panic("NULL pointer passed to vfswrap_link()\n"); +#endif + result = sys_link(oldpath, newpath); + END_PROFILE(syscall_link); + return result; +} + +int vfswrap_mknod(connection_struct *conn, const char *pathname, mode_t mode, SMB_DEV_T dev) +{ + int result; + + START_PROFILE(syscall_mknod); + +#ifdef VFS_CHECK_NULL + if (pathname == NULL) + smb_panic("NULL pointer passed to vfswrap_mknod()\n"); +#endif + result = sys_mknod(pathname, mode, dev); + END_PROFILE(syscall_mknod); + return result; +} + +size_t vfswrap_fget_nt_acl(files_struct *fsp, int fd, SEC_DESC **ppdesc) +{ + size_t result; + + START_PROFILE(fget_nt_acl); + result = get_nt_acl(fsp, ppdesc); + END_PROFILE(fget_nt_acl); + return result; +} + +size_t vfswrap_get_nt_acl(files_struct *fsp, const char *name, SEC_DESC **ppdesc) +{ + size_t result; + + START_PROFILE(get_nt_acl); + result = get_nt_acl(fsp, ppdesc); + END_PROFILE(get_nt_acl); + return result; +} + +BOOL vfswrap_fset_nt_acl(files_struct *fsp, int fd, uint32 security_info_sent, SEC_DESC *psd) +{ + BOOL result; + + START_PROFILE(fset_nt_acl); + result = set_nt_acl(fsp, security_info_sent, psd); + END_PROFILE(fset_nt_acl); + return result; +} + +BOOL vfswrap_set_nt_acl(files_struct *fsp, const char *name, uint32 security_info_sent, SEC_DESC *psd) +{ + BOOL result; + + START_PROFILE(set_nt_acl); + result = set_nt_acl(fsp, security_info_sent, psd); + END_PROFILE(set_nt_acl); + return result; +} + +int vfswrap_chmod_acl(connection_struct *conn, const char *name, mode_t mode) +{ + int result; + + START_PROFILE(chmod_acl); + result = chmod_acl(name, mode); + END_PROFILE(chmod_acl); + return result; +} + +int vfswrap_fchmod_acl(files_struct *fsp, int fd, mode_t mode) +{ + int result; + + START_PROFILE(fchmod_acl); + result = fchmod_acl(fd, mode); + END_PROFILE(fchmod_acl); + return result; +} |