DO NOT MERGE Add DhcpStateMachine

Add DhcpStateMachine for interation with dhcpcd

- Supports wakeup and renewal on dhcp
- Supports multiple controllers to use the state machine
  simultaneously
- Optionally, a controller can request a notification prior
    to DHCP request/renewal being sent

Change-Id: I5324814b19ff19863aa6fa89f1e3f0a202930c98

1 files changed, 32 insertions, 3 deletions

diff --git a/core/jni/android_net_NetUtils.cpp b/core/jni/android_net_NetUtils.cpp
index 3adf770..4becad7 100644
--- a/core/jni/android_net_NetUtils.cpp
+++ b/core/jni/android_net_NetUtils.cpp
@@ -40,6 +40,16 @@ int dhcp_do_request(const char *ifname,
                     const char *dns2,
                     const char *server,
                     uint32_t  *lease);
+
+int dhcp_do_request_renew(const char *ifname,
+                    const char *ipaddr,
+                    const char *gateway,
+                    uint32_t  *prefixLength,
+                    const char *dns1,
+                    const char *dns2,
+                    const char *server,
+                    uint32_t  *lease);
+
 int dhcp_stop(const char *ifname);
 int dhcp_release_lease(const char *ifname);
 char *dhcp_get_errmsg();
@@ -146,7 +156,8 @@ static jint android_net_utils_resetConnections(JNIEnv* env, jobject clazz, jstri
     return (jint)result;
 }
 
-static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
+static jboolean android_net_utils_runDhcpCommon(JNIEnv* env, jobject clazz, jstring ifname,
+        jobject info, bool renew)
 {
     int result;
     char  ipaddr[PROPERTY_VALUE_MAX];
@@ -160,8 +171,14 @@ static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring if
     const char *nameStr = env->GetStringUTFChars(ifname, NULL);
     if (nameStr == NULL) return (jboolean)false;
 
-    result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength,
-                                        dns1, dns2, server, &lease);
+    if (renew) {
+        result = ::dhcp_do_request_renew(nameStr, ipaddr, gateway, &prefixLength,
+                dns1, dns2, server, &lease);
+    } else {
+        result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength,
+                dns1, dns2, server, &lease);
+    }
+
     env->ReleaseStringUTFChars(ifname, nameStr);
     if (result == 0 && dhcpInfoInternalFieldIds.dhcpInfoInternalClass != NULL) {
         env->SetObjectField(info, dhcpInfoInternalFieldIds.ipaddress, env->NewStringUTF(ipaddr));
@@ -176,6 +193,17 @@ static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring if
     return (jboolean)(result == 0);
 }
 
+static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
+{
+    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, false);
+}
+
+static jboolean android_net_utils_runDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
+{
+    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, true);
+}
+
+
 static jboolean android_net_utils_stopDhcp(JNIEnv* env, jobject clazz, jstring ifname)
 {
     int result;
@@ -219,6 +247,7 @@ static JNINativeMethod gNetworkUtilMethods[] = {
     { "removeDefaultRoute", "(Ljava/lang/String;)I",  (void *)android_net_utils_removeDefaultRoute },
     { "resetConnections", "(Ljava/lang/String;)I",  (void *)android_net_utils_resetConnections },
     { "runDhcp", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcp },
+    { "runDhcpRenew", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcpRenew },
     { "stopDhcp", "(Ljava/lang/String;)Z",  (void *)android_net_utils_stopDhcp },
     { "releaseDhcpLease", "(Ljava/lang/String;)Z",  (void *)android_net_utils_releaseDhcpLease },
     { "getDhcpError", "()Ljava/lang/String;", (void*) android_net_utils_getDhcpError },