From: Jeremy Allison <jra@samba.org>
Date: Thu, 22 Aug 2019 21:26:47 +0000 (-0700)
Subject: s3: VFS: vfs_shadow_copy2. Implement readlinkat().
X-Git-Tag: tevent-0.10.1~177
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=06609f3ada9a4c8fe830e8b01d4ada2dcc640523;p=thirdparty%2Fsamba.git

s3: VFS: vfs_shadow_copy2. Implement readlinkat().

Currently identical to readlink().

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

diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
index 2891a5c0959..7425628d70a 100644
--- a/source3/modules/vfs_shadow_copy2.c
+++ b/source3/modules/vfs_shadow_copy2.c
@@ -1710,6 +1710,57 @@ static int shadow_copy2_readlink(vfs_handle_struct *handle,
 	return ret;
 }
 
+static int shadow_copy2_readlinkat(vfs_handle_struct *handle,
+				files_struct *dirfsp,
+				const struct smb_filename *smb_fname,
+				char *buf,
+				size_t bufsiz)
+{
+	time_t timestamp = 0;
+	char *stripped = NULL;
+	int saved_errno = 0;
+	int ret;
+	struct smb_filename *conv = NULL;
+
+	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
+					 smb_fname->base_name,
+					 &timestamp, &stripped)) {
+		return -1;
+	}
+	if (timestamp == 0) {
+		return SMB_VFS_NEXT_READLINKAT(handle,
+				dirfsp,
+				smb_fname,
+				buf,
+				bufsiz);
+	}
+	conv = cp_smb_filename(talloc_tos(), smb_fname);
+	if (conv == NULL) {
+		TALLOC_FREE(stripped);
+		errno = ENOMEM;
+		return -1;
+	}
+	conv->base_name = shadow_copy2_convert(
+		conv, handle, stripped, timestamp);
+	TALLOC_FREE(stripped);
+	if (conv->base_name == NULL) {
+		return -1;
+	}
+	ret = SMB_VFS_NEXT_READLINKAT(handle,
+				dirfsp,
+				conv,
+				buf,
+				bufsiz);
+	if (ret == -1) {
+		saved_errno = errno;
+	}
+	TALLOC_FREE(conv);
+	if (saved_errno != 0) {
+		errno = saved_errno;
+	}
+	return ret;
+}
+
 static int shadow_copy2_mknodat(vfs_handle_struct *handle,
 			files_struct *dirfsp,
 			const struct smb_filename *smb_fname,
@@ -3155,6 +3206,7 @@ static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
 	.chdir_fn = shadow_copy2_chdir,
 	.ntimes_fn = shadow_copy2_ntimes,
 	.readlink_fn = shadow_copy2_readlink,
+	.readlinkat_fn = shadow_copy2_readlinkat,
 	.mknodat_fn = shadow_copy2_mknodat,
 	.realpath_fn = shadow_copy2_realpath,
 	.get_nt_acl_fn = shadow_copy2_get_nt_acl,