From: Ralph Boehme <slow@samba.org>
Date: Wed, 20 May 2020 21:07:20 +0000 (+0200)
Subject: vfs_streams_depot: implement SMB_VFS_OPENAT()
X-Git-Tag: ldb-2.2.0~380
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dcddc45c4c8272e236fa2ca918f376ff0b698f1d;p=thirdparty%2Fsamba.git

vfs_streams_depot: implement SMB_VFS_OPENAT()

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
---

diff --git a/source3/modules/vfs_streams_depot.c b/source3/modules/vfs_streams_depot.c
index e408cbdc492..7a3402606d1 100644
--- a/source3/modules/vfs_streams_depot.c
+++ b/source3/modules/vfs_streams_depot.c
@@ -661,6 +661,80 @@ static int streams_depot_open(vfs_handle_struct *handle,
 	return ret;
 }
 
+static int streams_depot_openat(struct vfs_handle_struct *handle,
+				const struct files_struct *dirfsp,
+				const struct smb_filename *smb_fname,
+				struct files_struct *fsp,
+				int flags,
+				mode_t mode)
+{
+	struct smb_filename *smb_fname_stream = NULL;
+	struct smb_filename *smb_fname_base = NULL;
+	struct files_struct *fspcwd = NULL;
+	NTSTATUS status;
+	int ret = -1;
+
+	/*
+	 * For now assert this so the below SMB_VFS_STAT() is ok.
+	 */
+	SMB_ASSERT(dirfsp->fh->fd == AT_FDCWD);
+
+	if (!is_named_stream(smb_fname)) {
+		return SMB_VFS_NEXT_OPENAT(handle,
+					   dirfsp,
+					   smb_fname,
+					   fsp,
+					   flags,
+					   mode);
+	}
+
+	/* Ensure the base file still exists. */
+	smb_fname_base = synthetic_smb_fname(talloc_tos(),
+					smb_fname->base_name,
+					NULL,
+					NULL,
+					smb_fname->twrp,
+					smb_fname->flags);
+	if (smb_fname_base == NULL) {
+		ret = -1;
+		errno = ENOMEM;
+		goto done;
+	}
+
+	ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
+	if (ret == -1) {
+		goto done;
+	}
+
+	/* Determine the stream name, and then open it. */
+	status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
+	if (!NT_STATUS_IS_OK(status)) {
+		ret = -1;
+		errno = map_errno_from_nt_status(status);
+		goto done;
+	}
+
+	status = vfs_at_fspcwd(talloc_tos(), handle->conn, &fspcwd);
+	if (!NT_STATUS_IS_OK(status)) {
+		ret = -1;
+		errno = map_errno_from_nt_status(status);
+		goto done;
+	}
+
+	ret = SMB_VFS_NEXT_OPENAT(handle,
+				  fspcwd,
+				  smb_fname_stream,
+				  fsp,
+				  flags,
+				  mode);
+
+ done:
+	TALLOC_FREE(smb_fname_stream);
+	TALLOC_FREE(smb_fname_base);
+	TALLOC_FREE(fspcwd);
+	return ret;
+}
+
 static int streams_depot_unlink_internal(vfs_handle_struct *handle,
 				struct files_struct *dirfsp,
 				const struct smb_filename *smb_fname,
@@ -1094,6 +1168,7 @@ static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
 static struct vfs_fn_pointers vfs_streams_depot_fns = {
 	.fs_capabilities_fn = streams_depot_fs_capabilities,
 	.open_fn = streams_depot_open,
+	.openat_fn = streams_depot_openat,
 	.stat_fn = streams_depot_stat,
 	.lstat_fn = streams_depot_lstat,
 	.unlinkat_fn = streams_depot_unlinkat,