s3: VFS: vfs_expand_msdfs. 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_expand_msdfs.c b/source3/modules/vfs_expand_msdfs.c
index 598da08c0c87216b1cca3bd9de6e1b95de1674be..f3450705e1af092a77f90fa7c7e6726acdfcf546 100644 (file)
--- a/source3/modules/vfs_expand_msdfs.c
+++ b/source3/modules/vfs_expand_msdfs.c
@@ -224,8 +224,57 @@ static int expand_msdfs_readlink(struct vfs_handle_struct *handle,
        return len;
 }
 
+static int expand_msdfs_readlinkat(struct vfs_handle_struct *handle,
+                               files_struct *dirfsp,
+                               const struct smb_filename *smb_fname,
+                               char *buf,
+                               size_t bufsiz)
+{
+       TALLOC_CTX *ctx = talloc_tos();
+       int result;
+       char *target = talloc_array(ctx, char, PATH_MAX+1);
+       size_t len;
+
+       if (!target) {
+               errno = ENOMEM;
+               return -1;
+       }
+       if (bufsiz == 0) {
+               errno = EINVAL;
+               return -1;
+       }
+
+       result = SMB_VFS_NEXT_READLINKAT(handle,
+                               dirfsp,
+                               smb_fname,
+                               target,
+                               PATH_MAX);
+
+       if (result <= 0)
+               return result;
+
+       target[result] = '\0';
+
+       if ((strncmp(target, "msdfs:", 6) == 0) &&
+           (strchr_m(target, '@') != NULL)) {
+               target = expand_msdfs_target(ctx, handle->conn, target);
+               if (!target) {
+                       errno = ENOENT;
+                       return -1;
+               }
+       }
+
+       len = MIN(bufsiz, strlen(target));
+
+       memcpy(buf, target, len);
+
+       TALLOC_FREE(target);
+       return len;
+}
+
 static struct vfs_fn_pointers vfs_expand_msdfs_fns = {
-       .readlink_fn = expand_msdfs_readlink
+       .readlink_fn = expand_msdfs_readlink,
+       .readlinkat_fn = expand_msdfs_readlinkat
 };
 
 static_decl_vfs;