s3:streams_xattr: recheck fsp->fsp_name after a rename
[kai/samba.git] / source3 / modules / vfs_streams_xattr.c
index e96f616e313e785be062ea42765ec7ad3fa8e089..6530a1813bd29bc16187d4d5670c78f3d7d055ac 100644 (file)
@@ -29,6 +29,9 @@
 struct stream_io {
        char *base;
        char *xattr_name;
+       void *fsp_name_ptr;
+       files_struct *fsp;
+       vfs_handle_struct *handle;
 };
 
 static SMB_INO_T stream_inode(const SMB_STRUCT_STAT *sbuf, const char *sname)
@@ -85,6 +88,49 @@ static ssize_t get_xattr_size(connection_struct *conn,
        return result;
 }
 
+static bool streams_xattr_recheck(struct stream_io *sio)
+{
+       NTSTATUS status;
+       char *base = NULL;
+       char *sname = NULL;
+       char *xattr_name = NULL;
+
+       if (sio->fsp->fsp_name == sio->fsp_name_ptr) {
+               return true;
+       }
+
+       status = split_ntfs_stream_name(talloc_tos(), sio->fsp->fsp_name,
+                                       &base, &sname);
+       if (!NT_STATUS_IS_OK(status)) {
+               return false;
+       }
+
+       if (sname == NULL) {
+               /* how can this happen */
+               errno = EINVAL;
+               return false;
+       }
+
+       xattr_name = talloc_asprintf(talloc_tos(), "%s%s",
+                                    SAMBA_XATTR_DOSSTREAM_PREFIX, sname);
+       if (xattr_name == NULL) {
+               return false;
+       }
+
+       TALLOC_FREE(sio->xattr_name);
+       TALLOC_FREE(sio->base);
+       sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
+                                       xattr_name);
+       sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
+                                 base);
+       sio->fsp_name_ptr = sio->fsp->fsp_name;
+
+       if ((sio->xattr_name == NULL) || (sio->base == NULL)) {
+               return false;
+       }
+
+       return true;
+}
 
 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
                               SMB_STRUCT_STAT *sbuf)
@@ -98,6 +144,10 @@ static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
                return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
        }
 
+       if (!streams_xattr_recheck(io)) {
+               return -1;
+       }
+
        if (SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf) == -1) {
                return -1;
        }
@@ -365,6 +415,9 @@ static int streams_xattr_open(vfs_handle_struct *handle,  const char *fname,
                                        xattr_name);
         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
                                  base);
+       sio->fsp_name_ptr = fsp->fsp_name;
+       sio->handle = handle;
+       sio->fsp = fsp;
 
        if ((sio->xattr_name == NULL) || (sio->base == NULL)) {
                errno = ENOMEM;
@@ -739,6 +792,10 @@ static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
                return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
        }
 
+       if (!streams_xattr_recheck(sio)) {
+               return -1;
+       }
+
        status = get_ea_value(talloc_tos(), handle->conn, fsp->base_fsp,
                              sio->base, sio->xattr_name, &ea);
        if (!NT_STATUS_IS_OK(status)) {
@@ -795,6 +852,10 @@ static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
                return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
        }
 
+       if (!streams_xattr_recheck(sio)) {
+               return -1;
+       }
+
        status = get_ea_value(talloc_tos(), handle->conn, fsp->base_fsp,
                              sio->base, sio->xattr_name, &ea);
        if (!NT_STATUS_IS_OK(status)) {
@@ -835,6 +896,10 @@ static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
                return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
        }
 
+       if (!streams_xattr_recheck(sio)) {
+               return -1;
+       }
+
        status = get_ea_value(talloc_tos(), handle->conn, fsp->base_fsp,
                              sio->base, sio->xattr_name, &ea);
        if (!NT_STATUS_IS_OK(status)) {