util-vserver-0.30.208

[util-vserver.git] / lib_internal / util-safechdir.c

diff --git a/lib_internal/util-safechdir.c b/lib_internal/util-safechdir.c
new file mode 100644 (file)
index 0000000..f7c4d97
--- /dev/null
+++ b/lib_internal/util-safechdir.c
@@ -0,0 +1,50 @@
+// $Id: util-safechdir.c,v 1.2 2004/02/19 22:25:50 ensc Exp $    --*- c -*--
+
+// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// 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; version 2 of the License.
+//  
+// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+
+int
+safeChdir(char const *path, struct stat const *exp_stat)
+{
+  if (strchr(path, '/')!=0) {
+    errno = EINVAL;
+    return -1;
+  }
+
+  {
+    struct stat                now_stat;
+    if (chdir(path)==-1 ||
+       stat(".", &now_stat)==-1) return -1;
+    if (exp_stat->st_dev != now_stat.st_dev ||
+       exp_stat->st_ino != now_stat.st_ino) {
+      // TODO: warning/logging
+      errno = EINVAL;
+      return -1;
+    }
+  }
+
+  return 0;
+}