1 files changed, 78 insertions, 0 deletions
diff --git a/libnetfs/io-restrict-auth.c b/libnetfs/io-restrict-auth.c
new file mode 100644
index 00000000..9d1fda3c
--- /dev/null
+++ b/libnetfs/io-restrict-auth.c
@@ -0,0 +1,78 @@
+/* 
+   Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+   Written by Michael I. Bushnell, p/BSG.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#include "netfs.h"
+#include "io_S.h"
+
+static inline int
+listmember (int *list, int query, int n)
+{
+  int i;
+  for (i = 0; i < n; i++)
+    if (list[i] == query)
+      return 1;
+  return 0;
+}
+
+error_t
+netfs_S_io_restrict_auth (struct protid *user,
+			  mach_port_t *newport,
+			  mach_msg_type_name_t *newporttype,
+			  uid_t *uids,
+			  mach_msg_type_number_t nuids,
+			  gid_t *gids,
+			  mach_msg_type_number_t ngids)
+{
+  struct idvec *uvec, *gvec;
+  int i;
+  struct protid *newpi;
+  
+  if (!user)
+    return EOPNOTSUPP;
+  
+  uvec = make_idvec ();
+  gvec = make_idvec ();
+
+  if (idvec_contains (user->user->uids, 0))
+    {
+      idvec_set_ids (uvec, uids, nuids);
+      idvec_set_ids (gvec, gids, ngids);
+    }
+  else
+    {
+      for (i = 0; i < user->user->uids->num; i++)
+	if (listmember (uids, user->user->uids->ids[i], nuids))
+	  idvec_add (uvec, user->user->uids->ids[i]);
+      
+      for (i = 0; i < user->user->gids->num; i++)
+	if (listmember (gids, user->user->gids->ids[i], ngids))
+	  idvec_add (gvec, user->user->gids->ids[i]);
+    }
+  
+  mutex_lock (&user->po->np->lock);
+  newpi = netfs_make_protid (user->po, iohelp_create_iouser (uvec, gvec));
+  *newport = ports_get_right (newpi);
+  mutex_unlock (&user->po->np->lock);
+  
+  *newporttype = MACH_MSG_TYPE_MAKE_SEND;
+  ports_port_deref (newpi);
+  return 0;
+}
+