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-rw-r--r--source3/smbd/fd_handle.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/source3/smbd/fd_handle.c b/source3/smbd/fd_handle.c
new file mode 100644
index 0000000..eb7fa55
--- /dev/null
+++ b/source3/smbd/fd_handle.c
@@ -0,0 +1,147 @@
+/*
+ Unix SMB/CIFS implementation.
+ fd_handle structure handling
+ Copyright (C) Ralph Boehme 2020
+
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "fd_handle.h"
+
+struct fd_handle {
+ size_t ref_count;
+ int fd;
+ uint64_t position_information;
+ off_t pos;
+ /*
+ * NT Create options, but we only look at
+ * NTCREATEX_FLAG_DENY_DOS and
+ * NTCREATEX_FLAG_DENY_FCB.
+ */
+ uint32_t private_options;
+ uint64_t gen_id;
+};
+
+static int fd_handle_destructor(struct fd_handle *fh)
+{
+ SMB_ASSERT((fh->fd == -1) || (fh->fd == AT_FDCWD));
+ return 0;
+}
+
+struct fd_handle *fd_handle_create(TALLOC_CTX *mem_ctx)
+{
+ struct fd_handle *fh = NULL;
+
+ fh = talloc_zero(mem_ctx, struct fd_handle);
+ if (fh == NULL) {
+ return NULL;
+ }
+ fh->fd = -1;
+
+ talloc_set_destructor(fh, fd_handle_destructor);
+
+ return fh;
+}
+
+size_t fh_get_refcount(struct fd_handle *fh)
+{
+ return fh->ref_count;
+}
+
+void fh_set_refcount(struct fd_handle *fh, size_t ref_count)
+{
+ fh->ref_count = ref_count;
+}
+
+uint64_t fh_get_position_information(struct fd_handle *fh)
+{
+ return fh->position_information;
+}
+
+void fh_set_position_information(struct fd_handle *fh, uint64_t posinfo)
+{
+ fh->position_information = posinfo;
+}
+
+off_t fh_get_pos(struct fd_handle *fh)
+{
+ return fh->pos;
+}
+
+void fh_set_pos(struct fd_handle *fh, off_t pos)
+{
+ fh->pos = pos;
+}
+
+uint32_t fh_get_private_options(struct fd_handle *fh)
+{
+ return fh->private_options;
+}
+
+void fh_set_private_options(struct fd_handle *fh, uint32_t private_options)
+{
+ fh->private_options = private_options;
+}
+
+uint64_t fh_get_gen_id(struct fd_handle *fh)
+{
+ return fh->gen_id;
+}
+
+void fh_set_gen_id(struct fd_handle *fh, uint64_t gen_id)
+{
+ fh->gen_id = gen_id;
+}
+
+/****************************************************************************
+ Helper functions for working with fsp->fh->fd
+****************************************************************************/
+
+int fsp_get_io_fd(const struct files_struct *fsp)
+{
+ if (fsp->fsp_flags.is_pathref) {
+ DBG_ERR("fsp [%s] is a path referencing fsp\n",
+ fsp_str_dbg(fsp));
+#ifdef DEVELOPER
+ smb_panic("fsp is a pathref");
+#endif
+ return -1;
+ }
+
+ return fsp->fh->fd;
+}
+
+int fsp_get_pathref_fd(const struct files_struct *fsp)
+{
+ return fsp->fh->fd;
+}
+
+void fsp_set_fd(struct files_struct *fsp, int fd)
+{
+ /*
+ * Deliberately allow setting an fd if the existing fd is the
+ * same. This happens if a VFS module assigns the fd to
+ * fsp->fh->fd in its openat VFS function. The canonical place
+ * where the assignment is done is in fd_open(), but some VFS
+ * modules do it anyway.
+ */
+
+ SMB_ASSERT(fsp->fh->fd == -1 ||
+ fsp->fh->fd == fd ||
+ fd == -1 ||
+ fd == AT_FDCWD);
+
+ fsp->fh->fd = fd;
+}