From 6a6bea9ce809b5ae94c566a82e67f1132196a00b Mon Sep 17 00:00:00 2001
From: "Michael I. Bushnell" <mib@gnu.org>
Date: Tue, 19 Dec 1995 18:12:37 +0000
Subject: Initial revision
---
libnetfs/io-restrict-auth.c | 72 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
create mode 100644 libnetfs/io-restrict-auth.c
(limited to 'libnetfs/io-restrict-auth.c')
diff --git a/libnetfs/io-restrict-auth.c b/libnetfs/io-restrict-auth.c
new file mode 100644
index 00000000..2190f8de
--- /dev/null
+++ b/libnetfs/io-restrict-auth.c
@@ -0,0 +1,72 @@
+/*
+ Copyright (C) 1995 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 "priv.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)
+{
+ uid_t *newuids, *newgids, *olduids, *oldgids;
+ int i, newnuids, newngids, oldnuids, oldngids;
+ struct protid *newpi;
+
+ if (!user)
+ return EOPNOTSUPP;
+
+ netfs_interpret_credential (user->credenital, &olduids, &oldnuids,
+ &oldgids, &oldngids);
+ newuids = alloca (sizeof (uid_t) * oldnuids);
+ newgids = alloca (sizeof (gid_t) * oldngids);
+ for (i = newnuids = 0; i < oldnuids; i++)
+ if (listmember (uids, olduids[i], nuids))
+ newuids[newnuids++] = olduids[i];
+ for (i = newngids = 0; i < oldngids; i++)
+ if (listmember (gids, oldgids[i], ngids))
+ newgids[newngids++] = oldgids[i];
+
+ mutex_lock (&cred->po->np->lock);
+ newpi = netfs_make_protid (user->po,
+ netfs_make_credential (newuids, newnuids,
+ newgids, newngids));
+ *newport = ports_get_right (newpi);
+ mutex_unlock (&cred->po->np->lock);
+
+ *newporttype = MACH_MSG_TYPE_MAKE_SEND;
+ ports_port_deref (newpi);
+ return 0;
+}
+
--
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