1 files changed, 92 insertions, 0 deletions
diff --git a/kinit/start_kdeinit_wrapper.c b/kinit/start_kdeinit_wrapper.c
new file mode 100644
index 000000000..bc6d0e31f
--- /dev/null
+++ b/kinit/start_kdeinit_wrapper.c
@@ -0,0 +1,92 @@
+/*
+ * This file is part of the KDE libraries
+ * Copyright (c) 2007 Lubos Lunak <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifdef KDEINIT_OOM_PROTECT
+
+/*
+ The start_kdeinit wrapper is setuid, which means some shell variables like LD_LIBRARY_PATH
+ get unset before it's launched. However kdeinit is used to launch most of KDE, so such variables
+ should not be dropped. Therefore this wrapper for the setuid wrapper read the environment
+ and writes it to start_kdeinit's stdin, which after dropping priviledges reads it and uses it
+ for launching the real kdeinit.
+*/
+int main(int argc, char **argv)
+{
+   int pipes[ 2 ];
+   if(argc == 0)
+      return 1;
+   if( pipe( pipes ) < 0 ) {
+      perror( "pipe()" );
+      return 1;
+   }
+   switch( fork()) {
+      case -1:
+         perror( "fork()" );
+         return 1;
+      default: /* parent, exec */ 
+         close( pipes[ 1 ] );
+         close( 0 ); /* stdin */
+         dup2( pipes[ 0 ], 0 );
+         close( pipes[ 0 ] );
+         argv[ 0 ] = (char*)"start_kdeinit";
+         execvp("start_kdeinit", argv);
+         perror("start_kdeinit");
+         return 1;
+      case 0: { /* child, pass env and exit */
+         extern char** environ;
+         int i;
+         close( pipes[ 0 ] );
+         write( pipes[ 1 ], "environ", 7 ); /* header, just in case */
+         for( i = 0;
+              environ[ i ] != NULL;
+              ++i )
+             {}
+         write( pipes[ 1 ], &i, sizeof( int )); /* write count */
+         for( i = 0;
+              environ[ i ] != NULL;
+              ++i )
+             {
+             int len = strlen( environ[ i ] );
+             write( pipes[ 1 ], &len, sizeof( int )); /* write length */
+             write( pipes[ 1 ], environ[ i ], strlen( environ[ i ] ));
+             }
+         close( pipes[ 1 ] );
+         }     
+   }
+   return 0;
+}
+
+#else /* not Linux, the simple non-setuid case */
+
+int main(int argc, char **argv)
+{
+   if(argc == 0)
+      return 1;
+   argv[0] = "start_kdeinit";
+   execvp("start_kdeinit",argv);
+   perror("start_kdeinit");
+   return 1;
+}
+#endif