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 4a5992f8af6dbf909f40f826beddd6441322e0fe..700855bc3cda408f4754d3a59c1999a1c68259d6 100644 (file)
--- 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,