[Openvpn-devel] [PATCH 4/8] Use pseudo gw as default gw on Android as a workaround for not being able to read /proc/net/route

[Arne Schwabe]

---
 src/openvpn/route.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/openvpn/route.c b/src/openvpn/route.c
index 03f8332..56cce07 100644
--- a/src/openvpn/route.c
+++ b/src/openvpn/route.c
@@ -2474,6 +2474,7 @@ get_default_gateway (struct route_gateway_info *rgi)

   CLEAR(*rgi);

+#ifndef TARGET_ANDROID
   /* get default gateway IP addr */
   {
     FILE *fp = fopen ("/proc/net/route", "r");
@@ -2530,6 +2531,19 @@ get_default_gateway (struct route_gateway_info *rgi)
          }
       }
   }
+#else
+  /* Android, set some pseudo GW, addr is in host byte order,
+   * Determining the default GW on Android 5.0+ is non trivial
+   * and serves almost no purpose since OpenVPN only uses the
+   * default GW address to add routes for networks that should
+   * NOT be routed over the VPN. Using a well known address
+   * (127.'d'.'g'.'w') for the default GW make detecting
+   * these routes easier from the controlling app.
+   */
+  rgi->gateway.addr = 127 << 24 | 'd' << 16 | 'g' << 8 | 'w';
+  rgi->flags |= RGI_ADDR_DEFINED;
+  strcpy(best_name, "android-gw");
+#endif

   /* scan adapter list */
   if (rgi->flags & RGI_ADDR_DEFINED)
-- 
2.3.2 (Apple Git-55)