/* * Copyright 2008, 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. */ #define LOG_TAG "NetUtils" #include "jni.h" #include #include #include #include #include extern "C" { int ifc_enable(const char *ifname); int ifc_disable(const char *ifname); int ifc_reset_connections(const char *ifname); int dhcp_do_request(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_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(); } #define NETUTILS_PKG_NAME "android/net/NetworkUtils" namespace android { /* * The following remembers the jfieldID's of the fields * of the DhcpInfo Java object, so that we don't have * to look them up every time. */ static struct fieldIds { jmethodID constructorId; jfieldID ipaddress; jfieldID prefixLength; jfieldID dns1; jfieldID dns2; jfieldID serverAddress; jfieldID leaseDuration; } dhcpInfoInternalFieldIds; static jint android_net_utils_enableInterface(JNIEnv* env, jobject clazz, jstring ifname) { int result; const char *nameStr = env->GetStringUTFChars(ifname, NULL); result = ::ifc_enable(nameStr); env->ReleaseStringUTFChars(ifname, nameStr); return (jint)result; } static jint android_net_utils_disableInterface(JNIEnv* env, jobject clazz, jstring ifname) { int result; const char *nameStr = env->GetStringUTFChars(ifname, NULL); result = ::ifc_disable(nameStr); env->ReleaseStringUTFChars(ifname, nameStr); return (jint)result; } static jint android_net_utils_resetConnections(JNIEnv* env, jobject clazz, jstring ifname) { int result; const char *nameStr = env->GetStringUTFChars(ifname, NULL); result = ::ifc_reset_connections(nameStr); env->ReleaseStringUTFChars(ifname, nameStr); return (jint)result; } static jboolean android_net_utils_runDhcpCommon(JNIEnv* env, jobject clazz, jstring ifname, jobject info, bool renew) { int result; char ipaddr[PROPERTY_VALUE_MAX]; uint32_t prefixLength; char gateway[PROPERTY_VALUE_MAX]; char dns1[PROPERTY_VALUE_MAX]; char dns2[PROPERTY_VALUE_MAX]; char server[PROPERTY_VALUE_MAX]; uint32_t lease; const char *nameStr = env->GetStringUTFChars(ifname, NULL); if (nameStr == NULL) return (jboolean)false; 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) { env->SetObjectField(info, dhcpInfoInternalFieldIds.ipaddress, env->NewStringUTF(ipaddr)); // set the gateway jclass cls = env->FindClass("java/net/InetAddress"); jmethodID method = env->GetStaticMethodID(cls, "getByName", "(Ljava/lang/String;)Ljava/net/InetAddress;"); jvalue args[1]; args[0].l = env->NewStringUTF(gateway); jobject inetAddressObject = env->CallStaticObjectMethodA(cls, method, args); if (!env->ExceptionOccurred()) { cls = env->FindClass("android/net/RouteInfo"); method = env->GetMethodID(cls, "", "(Ljava/net/InetAddress;)V"); args[0].l = inetAddressObject; jobject routeInfoObject = env->NewObjectA(cls, method, args); cls = env->FindClass("android/net/DhcpInfoInternal"); method = env->GetMethodID(cls, "addRoute", "(Landroid/net/RouteInfo;)V"); args[0].l = routeInfoObject; env->CallVoidMethodA(info, method, args); } else { // if we have an exception (host not found perhaps), just don't add the route env->ExceptionClear(); } env->SetIntField(info, dhcpInfoInternalFieldIds.prefixLength, prefixLength); env->SetObjectField(info, dhcpInfoInternalFieldIds.dns1, env->NewStringUTF(dns1)); env->SetObjectField(info, dhcpInfoInternalFieldIds.dns2, env->NewStringUTF(dns2)); env->SetObjectField(info, dhcpInfoInternalFieldIds.serverAddress, env->NewStringUTF(server)); env->SetIntField(info, dhcpInfoInternalFieldIds.leaseDuration, lease); } 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; const char *nameStr = env->GetStringUTFChars(ifname, NULL); result = ::dhcp_stop(nameStr); env->ReleaseStringUTFChars(ifname, nameStr); return (jboolean)(result == 0); } static jboolean android_net_utils_releaseDhcpLease(JNIEnv* env, jobject clazz, jstring ifname) { int result; const char *nameStr = env->GetStringUTFChars(ifname, NULL); result = ::dhcp_release_lease(nameStr); env->ReleaseStringUTFChars(ifname, nameStr); return (jboolean)(result == 0); } static jstring android_net_utils_getDhcpError(JNIEnv* env, jobject clazz) { return env->NewStringUTF(::dhcp_get_errmsg()); } // ---------------------------------------------------------------------------- /* * JNI registration. */ static JNINativeMethod gNetworkUtilMethods[] = { /* name, signature, funcPtr */ { "enableInterface", "(Ljava/lang/String;)I", (void *)android_net_utils_enableInterface }, { "disableInterface", "(Ljava/lang/String;)I", (void *)android_net_utils_disableInterface }, { "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 }, }; int register_android_net_NetworkUtils(JNIEnv* env) { jclass dhcpInfoInternalClass = env->FindClass("android/net/DhcpInfoInternal"); LOG_FATAL_IF(dhcpInfoInternalClass == NULL, "Unable to find class android/net/DhcpInfoInternal"); dhcpInfoInternalFieldIds.constructorId = env->GetMethodID(dhcpInfoInternalClass, "", "()V"); dhcpInfoInternalFieldIds.ipaddress = env->GetFieldID(dhcpInfoInternalClass, "ipAddress", "Ljava/lang/String;"); dhcpInfoInternalFieldIds.prefixLength = env->GetFieldID(dhcpInfoInternalClass, "prefixLength", "I"); dhcpInfoInternalFieldIds.dns1 = env->GetFieldID(dhcpInfoInternalClass, "dns1", "Ljava/lang/String;"); dhcpInfoInternalFieldIds.dns2 = env->GetFieldID(dhcpInfoInternalClass, "dns2", "Ljava/lang/String;"); dhcpInfoInternalFieldIds.serverAddress = env->GetFieldID(dhcpInfoInternalClass, "serverAddress", "Ljava/lang/String;"); dhcpInfoInternalFieldIds.leaseDuration = env->GetFieldID(dhcpInfoInternalClass, "leaseDuration", "I"); return AndroidRuntime::registerNativeMethods(env, NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods)); } }; // namespace android