core/jni/android_net_NetUtils.cpp - platform/frameworks/base - Git at Google

 /*
  * 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 <utils/misc.h>
 #include <android_runtime/AndroidRuntime.h>
 #include <utils/Log.h>
 #include <arpa/inet.h>
 #include <cutils/properties.h>

 extern "C" {
 int ifc_enable(const char *ifname);
 int ifc_disable(const char *ifname);
 int ifc_reset_connections(const char *ifname, int reset_mask);

 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,
                     const char *vendorInfo);

 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,
                     const char *vendorInfo);

 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;
     jfieldID vendorInfo;
 } 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, jint mask)
 {
     int result;

     const char *nameStr = env->GetStringUTFChars(ifname, NULL);

     ALOGD("android_net_utils_resetConnections in env=%p clazz=%p iface=%s mask=0x%x\n",
           env, clazz, nameStr, mask);

     result = ::ifc_reset_connections(nameStr, mask);
     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;
     char vendorInfo[PROPERTY_VALUE_MAX];

     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, vendorInfo);
     } else {
         result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength,
                 dns1, dns2, server, &lease, vendorInfo);
     }

     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, "<init>", "(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);
         env->SetObjectField(info, dhcpInfoInternalFieldIds.vendorInfo, env->NewStringUTF(vendorInfo));
     }
     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)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, "<init>", "()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");
     dhcpInfoInternalFieldIds.vendorInfo = env->GetFieldID(dhcpInfoInternalClass, "vendorInfo", "Ljava/lang/String;");

     return AndroidRuntime::registerNativeMethods(env,
             NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods));
 }

 }; // namespace android
	/*
	* 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 <utils/misc.h>
	#include <android_runtime/AndroidRuntime.h>
	#include <utils/Log.h>
	#include <arpa/inet.h>
	#include <cutils/properties.h>

	extern "C" {
	int ifc_enable(const char *ifname);
	int ifc_disable(const char *ifname);
	int ifc_reset_connections(const char *ifname, int reset_mask);

	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,
	const char *vendorInfo);

	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,
	const char *vendorInfo);

	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;
	jfieldID vendorInfo;
	} 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, jint mask)
	{
	int result;

	const char *nameStr = env->GetStringUTFChars(ifname, NULL);

	ALOGD("android_net_utils_resetConnections in env=%p clazz=%p iface=%s mask=0x%x\n",
	env, clazz, nameStr, mask);

	result = ::ifc_reset_connections(nameStr, mask);
	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;
	char vendorInfo[PROPERTY_VALUE_MAX];

	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, vendorInfo);
	} else {
	result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength,
	dns1, dns2, server, &lease, vendorInfo);
	}

	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, "<init>", "(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);
	env->SetObjectField(info, dhcpInfoInternalFieldIds.vendorInfo, env->NewStringUTF(vendorInfo));
	}
	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)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, "<init>", "()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");
	dhcpInfoInternalFieldIds.vendorInfo = env->GetFieldID(dhcpInfoInternalClass, "vendorInfo", "Ljava/lang/String;");

	return AndroidRuntime::registerNativeMethods(env,
	NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods));
	}

	}; // namespace android