Promote ip-up-vpn into the framework.

pppd needs it, and racoon will also use it soon.

Change-Id: I7fc40a709f7d44f75cd3683ab77d90cbc29cd765
diff --git a/cmds/ip-up-vpn/ip-up-vpn.c b/cmds/ip-up-vpn/ip-up-vpn.c
new file mode 100644
index 0000000..bbf6b14
--- /dev/null
+++ b/cmds/ip-up-vpn/ip-up-vpn.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <cutils/properties.h>
+
+int main(int argc, char **argv)
+{
+    if (argc > 1 && strlen(argv[1]) > 0) {
+        char dns[PROPERTY_VALUE_MAX];
+        char *dns1 = getenv("DNS1");
+        char *dns2 = getenv("DNS2");
+
+        snprintf(dns, sizeof(dns), "%s %s", dns1 ? dns1 : "", dns2 ? dns2 : "");
+        property_set("vpn.dns", dns);
+        property_set("vpn.via", argv[1]);
+    }
+    return 0;
+}