Initial revision

1 files changed, 63 insertions, 0 deletions

diff --git a/libdiskfs/io-restrict-auth.c b/libdiskfs/io-restrict-auth.c
new file mode 100644
index 00000000..88797c42
--- /dev/null
+++ b/libdiskfs/io-restrict-auth.c
@@ -0,0 +1,63 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   This program 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.
+
+   This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+/* Tell if the array LIST (of size N) contains a member equal to QUERY. */
+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;
+}
+
+/* Implement io_restrict_auth as described in <hurd/io.defs>. */
+error_t
+diskfs_S_io_restrict_auth (struct protid *cred,
+			   mach_port_t *newport,
+			   mach_msg_type_name_t *newportpoly,
+			   uid_t *uids,
+			   u_int nuids,
+			   gid_t *gids,
+			   u_int ngids)
+{
+  uid_t *newuids, *newgids;
+  int i, newnuids, newngids;
+  
+  if (!cred)
+    return EOPNOTSUPP;
+  
+  newuids = alloca (sizeof (uid_t) * cred->nuids);
+  newgids = alloca (sizeof (uid_t) * cred->ngids);
+  
+  for (i = newnuids = 0; i < cred->nuids; i++)
+    if (listmember (uids, cred->uids[i], nuids))
+      newuids[newnuids++] = cred->uids[i];
+  for (i = newngids = 0; i < cred->ngids; i++)
+    if (listmember (gids, cred->gids[i], ngids))
+      newgids[newngids++] = cred->gids[i];
+      
+  mutex_lock (&cred->po->ip->i_toplock);
+  *newport = (make_protid (cred->po, newuids, newnuids, newgids,
+			   newngids))->fspt.pi.port;
+  mutex_unlock (&cred->po->ip->i_toplock);
+  *newportpoly = MACH_MSG_TYPE_MAKE_SEND;
+  return 0;
+}