From: Jeremy Allison <jra@samba.org>
Date: Thu, 22 Aug 2019 20:49:28 +0000 (-0700)
Subject: s3: VFS: vfs_cap. Implement readlinkat().
X-Git-Tag: tevent-0.10.1~184
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=885d804c91ada945cf4c7d721cf08f55952f6e0b;p=thirdparty%2Fsamba.git

s3: VFS: vfs_cap. 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_cap.c b/source3/modules/vfs_cap.c
index 4a5992f8af6..700855bc3cd 100644
--- a/source3/modules/vfs_cap.c
+++ b/source3/modules/vfs_cap.c
@@ -585,6 +585,47 @@ static int cap_readlink(vfs_handle_struct *handle,
 	return ret;
 }
 
+static int cap_readlinkat(vfs_handle_struct *handle,
+			files_struct *dirfsp,
+			const struct smb_filename *smb_fname,
+			char *buf,
+			size_t bufsiz)
+{
+	char *cappath = capencode(talloc_tos(), smb_fname->base_name);
+	struct smb_filename *cap_smb_fname = NULL;
+	int saved_errno = 0;
+	int ret;
+
+	if (!cappath) {
+		errno = ENOMEM;
+		return -1;
+	}
+	cap_smb_fname = synthetic_smb_fname(talloc_tos(),
+					cappath,
+					NULL,
+					NULL,
+					smb_fname->flags);
+	if (cap_smb_fname == NULL) {
+		TALLOC_FREE(cappath);
+		errno = ENOMEM;
+		return -1;
+	}
+	ret = SMB_VFS_NEXT_READLINKAT(handle,
+			dirfsp,
+			cap_smb_fname,
+			buf,
+			bufsiz);
+	if (ret == -1) {
+		saved_errno = errno;
+	}
+	TALLOC_FREE(cappath);
+	TALLOC_FREE(cap_smb_fname);
+	if (saved_errno != 0) {
+		errno = saved_errno;
+	}
+	return ret;
+}
+
 static int cap_linkat(vfs_handle_struct *handle,
 		files_struct *srcfsp,
 		const struct smb_filename *old_smb_fname,
@@ -1039,6 +1080,7 @@ static struct vfs_fn_pointers vfs_cap_fns = {
 	.ntimes_fn = cap_ntimes,
 	.symlink_fn = cap_symlink,
 	.readlink_fn = cap_readlink,
+	.readlinkat_fn = cap_readlinkat,
 	.linkat_fn = cap_linkat,
 	.mknodat_fn = cap_mknodat,
 	.realpath_fn = cap_realpath,