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

 /*
  * Copyright 2020, 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 <vector>

 #include <arpa/inet.h>
 #include <linux/filter.h>
 #include <linux/if_arp.h>
 #include <linux/tcp.h>
 #include <net/if.h>
 #include <netinet/ether.h>
 #include <netinet/ip.h>
 #include <netinet/udp.h>

 #include <DnsProxydProtocol.h> // NETID_USE_LOCAL_NAMESERVERS
 #include <cutils/properties.h>
 #include <nativehelper/JNIPlatformHelp.h>
 #include <nativehelper/ScopedLocalRef.h>
 #include <utils/Log.h>
 #include <utils/misc.h>

 #include "NetdClient.h"
 #include "core_jni_helpers.h"
 #include "jni.h"

 extern "C" {
 int ifc_enable(const char *ifname);
 int ifc_disable(const char *ifname);
 }

 #define NETUTILS_PKG_NAME "android/net/NetworkUtils"

 namespace android {

 constexpr int MAXPACKETSIZE = 8 * 1024;
 // FrameworkListener limits the size of commands to 4096 bytes.
 constexpr int MAXCMDSIZE = 4096;

 static void throwErrnoException(JNIEnv* env, const char* functionName, int error) {
     ScopedLocalRef<jstring> detailMessage(env, env->NewStringUTF(functionName));
     if (detailMessage.get() == NULL) {
         // Not really much we can do here. We're probably dead in the water,
         // but let's try to stumble on...
         env->ExceptionClear();
     }
     static jclass errnoExceptionClass =
             MakeGlobalRefOrDie(env, FindClassOrDie(env, "android/system/ErrnoException"));

     static jmethodID errnoExceptionCtor =
             GetMethodIDOrDie(env, errnoExceptionClass,
             "<init>", "(Ljava/lang/String;I)V");

     jobject exception = env->NewObject(errnoExceptionClass,
                                        errnoExceptionCtor,
                                        detailMessage.get(),
                                        error);
     env->Throw(reinterpret_cast<jthrowable>(exception));
 }

 static void android_net_utils_attachDropAllBPFFilter(JNIEnv *env, jobject clazz, jobject javaFd)
 {
     struct sock_filter filter_code[] = {
         // Reject all.
         BPF_STMT(BPF_RET | BPF_K, 0)
     };
     struct sock_fprog filter = {
         sizeof(filter_code) / sizeof(filter_code[0]),
         filter_code,
     };

     int fd = jniGetFDFromFileDescriptor(env, javaFd);
     if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter)) != 0) {
         jniThrowExceptionFmt(env, "java/net/SocketException",
                 "setsockopt(SO_ATTACH_FILTER): %s", strerror(errno));
     }
 }

 static void android_net_utils_detachBPFFilter(JNIEnv *env, jobject clazz, jobject javaFd)
 {
     int optval_ignored = 0;
     int fd = jniGetFDFromFileDescriptor(env, javaFd);
     if (setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, &optval_ignored, sizeof(optval_ignored)) !=
         0) {
         jniThrowExceptionFmt(env, "java/net/SocketException",
                 "setsockopt(SO_DETACH_FILTER): %s", strerror(errno));
     }
 }

 static jboolean android_net_utils_bindProcessToNetwork(JNIEnv *env, jobject thiz, jint netId)
 {
     return (jboolean) !setNetworkForProcess(netId);
 }

 static jint android_net_utils_getBoundNetworkForProcess(JNIEnv *env, jobject thiz)
 {
     return getNetworkForProcess();
 }

 static jboolean android_net_utils_bindProcessToNetworkForHostResolution(JNIEnv *env, jobject thiz,
         jint netId)
 {
     return (jboolean) !setNetworkForResolv(netId);
 }

 static jint android_net_utils_bindSocketToNetwork(JNIEnv *env, jobject thiz, jint socket,
         jint netId)
 {
     return setNetworkForSocket(netId, socket);
 }

 static jboolean android_net_utils_protectFromVpn(JNIEnv *env, jobject thiz, jint socket)
 {
     return (jboolean) !protectFromVpn(socket);
 }

 static jboolean android_net_utils_queryUserAccess(JNIEnv *env, jobject thiz, jint uid, jint netId)
 {
     return (jboolean) !queryUserAccess(uid, netId);
 }

 static bool checkLenAndCopy(JNIEnv* env, const jbyteArray& addr, int len, void* dst)
 {
     if (env->GetArrayLength(addr) != len) {
         return false;
     }
     env->GetByteArrayRegion(addr, 0, len, reinterpret_cast<jbyte*>(dst));
     return true;
 }

 static jobject android_net_utils_resNetworkQuery(JNIEnv *env, jobject thiz, jint netId,
         jstring dname, jint ns_class, jint ns_type, jint flags) {
     const jsize javaCharsCount = env->GetStringLength(dname);
     const jsize byteCountUTF8 = env->GetStringUTFLength(dname);

     // Only allow dname which could be simply formatted to UTF8.
     // In native layer, res_mkquery would re-format the input char array to packet.
     std::vector<char> queryname(byteCountUTF8 + 1, 0);

     env->GetStringUTFRegion(dname, 0, javaCharsCount, queryname.data());
     int fd = resNetworkQuery(netId, queryname.data(), ns_class, ns_type, flags);

     if (fd < 0) {
         throwErrnoException(env, "resNetworkQuery", -fd);
         return nullptr;
     }

     return jniCreateFileDescriptor(env, fd);
 }

 static jobject android_net_utils_resNetworkSend(JNIEnv *env, jobject thiz, jint netId,
         jbyteArray msg, jint msgLen, jint flags) {
     uint8_t data[MAXCMDSIZE];

     checkLenAndCopy(env, msg, msgLen, data);
     int fd = resNetworkSend(netId, data, msgLen, flags);

     if (fd < 0) {
         throwErrnoException(env, "resNetworkSend", -fd);
         return nullptr;
     }

     return jniCreateFileDescriptor(env, fd);
 }

 static jobject android_net_utils_resNetworkResult(JNIEnv *env, jobject thiz, jobject javaFd) {
     int fd = jniGetFDFromFileDescriptor(env, javaFd);
     int rcode;
     std::vector<uint8_t> buf(MAXPACKETSIZE, 0);

     int res = resNetworkResult(fd, &rcode, buf.data(), MAXPACKETSIZE);
     jniSetFileDescriptorOfFD(env, javaFd, -1);
     if (res < 0) {
         throwErrnoException(env, "resNetworkResult", -res);
         return nullptr;
     }

     jbyteArray answer = env->NewByteArray(res);
     if (answer == nullptr) {
         throwErrnoException(env, "resNetworkResult", ENOMEM);
         return nullptr;
     } else {
         env->SetByteArrayRegion(answer, 0, res,
                 reinterpret_cast<jbyte*>(buf.data()));
     }

     jclass class_DnsResponse = env->FindClass("android/net/DnsResolver$DnsResponse");
     jmethodID ctor = env->GetMethodID(class_DnsResponse, "<init>", "([BI)V");

     return env->NewObject(class_DnsResponse, ctor, answer, rcode);
 }

 static void android_net_utils_resNetworkCancel(JNIEnv *env, jobject thiz, jobject javaFd) {
     int fd = jniGetFDFromFileDescriptor(env, javaFd);
     resNetworkCancel(fd);
     jniSetFileDescriptorOfFD(env, javaFd, -1);
 }

 static jobject android_net_utils_getDnsNetwork(JNIEnv *env, jobject thiz) {
     unsigned dnsNetId = 0;
     if (int res = getNetworkForDns(&dnsNetId) < 0) {
         throwErrnoException(env, "getDnsNetId", -res);
         return nullptr;
     }
     bool privateDnsBypass = dnsNetId & NETID_USE_LOCAL_NAMESERVERS;

     static jclass class_Network = MakeGlobalRefOrDie(
             env, FindClassOrDie(env, "android/net/Network"));
     static jmethodID ctor = env->GetMethodID(class_Network, "<init>", "(IZ)V");
     return env->NewObject(
             class_Network, ctor, dnsNetId & ~NETID_USE_LOCAL_NAMESERVERS, privateDnsBypass);
 }

 static jobject android_net_utils_getTcpRepairWindow(JNIEnv *env, jobject thiz, jobject javaFd) {
     if (javaFd == NULL) {
         jniThrowNullPointerException(env, NULL);
         return NULL;
     }

     int fd = jniGetFDFromFileDescriptor(env, javaFd);
     struct tcp_repair_window trw = {};
     socklen_t size = sizeof(trw);

     // Obtain the parameters of the TCP repair window.
     int rc = getsockopt(fd, IPPROTO_TCP, TCP_REPAIR_WINDOW, &trw, &size);
     if (rc == -1) {
       throwErrnoException(env, "getsockopt : TCP_REPAIR_WINDOW", errno);
       return NULL;
     }

     struct tcp_info tcpinfo = {};
     socklen_t tcpinfo_size = sizeof(tcp_info);

     // Obtain the window scale from the tcp info structure. This contains a scale factor that
     // should be applied to the window size.
     rc = getsockopt(fd, IPPROTO_TCP, TCP_INFO, &tcpinfo, &tcpinfo_size);
     if (rc == -1) {
       throwErrnoException(env, "getsockopt : TCP_INFO", errno);
       return NULL;
     }

     jclass class_TcpRepairWindow = env->FindClass("android/net/TcpRepairWindow");
     jmethodID ctor = env->GetMethodID(class_TcpRepairWindow, "<init>", "(IIIIII)V");

     return env->NewObject(class_TcpRepairWindow, ctor, trw.snd_wl1, trw.snd_wnd, trw.max_window,
             trw.rcv_wnd, trw.rcv_wup, tcpinfo.tcpi_rcv_wscale);
 }

 // ----------------------------------------------------------------------------

 /*
  * JNI registration.
  */
 // clang-format off
 static const JNINativeMethod gNetworkUtilMethods[] = {
     /* name, signature, funcPtr */
     { "bindProcessToNetwork", "(I)Z", (void*) android_net_utils_bindProcessToNetwork },
     { "getBoundNetworkForProcess", "()I", (void*) android_net_utils_getBoundNetworkForProcess },
     { "bindProcessToNetworkForHostResolution", "(I)Z", (void*) android_net_utils_bindProcessToNetworkForHostResolution },
     { "bindSocketToNetwork", "(II)I", (void*) android_net_utils_bindSocketToNetwork },
     { "protectFromVpn", "(I)Z", (void*)android_net_utils_protectFromVpn },
     { "queryUserAccess", "(II)Z", (void*)android_net_utils_queryUserAccess },
     { "attachDropAllBPFFilter", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_attachDropAllBPFFilter },
     { "detachBPFFilter", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_detachBPFFilter },
     { "getTcpRepairWindow", "(Ljava/io/FileDescriptor;)Landroid/net/TcpRepairWindow;", (void*) android_net_utils_getTcpRepairWindow },
     { "resNetworkSend", "(I[BII)Ljava/io/FileDescriptor;", (void*) android_net_utils_resNetworkSend },
     { "resNetworkQuery", "(ILjava/lang/String;III)Ljava/io/FileDescriptor;", (void*) android_net_utils_resNetworkQuery },
     { "resNetworkResult", "(Ljava/io/FileDescriptor;)Landroid/net/DnsResolver$DnsResponse;", (void*) android_net_utils_resNetworkResult },
     { "resNetworkCancel", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_resNetworkCancel },
     { "getDnsNetwork", "()Landroid/net/Network;", (void*) android_net_utils_getDnsNetwork },
 };
 // clang-format on

 int register_android_net_NetworkUtils(JNIEnv* env)
 {
     return RegisterMethodsOrDie(env, NETUTILS_PKG_NAME, gNetworkUtilMethods,
                                 NELEM(gNetworkUtilMethods));
 }

 }; // namespace android
	/*
	* Copyright 2020, 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 <vector>

	#include <arpa/inet.h>
	#include <linux/filter.h>
	#include <linux/if_arp.h>
	#include <linux/tcp.h>
	#include <net/if.h>
	#include <netinet/ether.h>
	#include <netinet/ip.h>
	#include <netinet/udp.h>

	#include <DnsProxydProtocol.h> // NETID_USE_LOCAL_NAMESERVERS
	#include <cutils/properties.h>
	#include <nativehelper/JNIPlatformHelp.h>
	#include <nativehelper/ScopedLocalRef.h>
	#include <utils/Log.h>
	#include <utils/misc.h>

	#include "NetdClient.h"
	#include "core_jni_helpers.h"
	#include "jni.h"

	extern "C" {
	int ifc_enable(const char *ifname);
	int ifc_disable(const char *ifname);
	}

	#define NETUTILS_PKG_NAME "android/net/NetworkUtils"

	namespace android {

	constexpr int MAXPACKETSIZE = 8 * 1024;
	// FrameworkListener limits the size of commands to 4096 bytes.
	constexpr int MAXCMDSIZE = 4096;

	static void throwErrnoException(JNIEnv* env, const char* functionName, int error) {
	ScopedLocalRef<jstring> detailMessage(env, env->NewStringUTF(functionName));
	if (detailMessage.get() == NULL) {
	// Not really much we can do here. We're probably dead in the water,
	// but let's try to stumble on...
	env->ExceptionClear();
	}
	static jclass errnoExceptionClass =
	MakeGlobalRefOrDie(env, FindClassOrDie(env, "android/system/ErrnoException"));

	static jmethodID errnoExceptionCtor =
	GetMethodIDOrDie(env, errnoExceptionClass,
	"<init>", "(Ljava/lang/String;I)V");

	jobject exception = env->NewObject(errnoExceptionClass,
	errnoExceptionCtor,
	detailMessage.get(),
	error);
	env->Throw(reinterpret_cast<jthrowable>(exception));
	}

	static void android_net_utils_attachDropAllBPFFilter(JNIEnv *env, jobject clazz, jobject javaFd)
	{
	struct sock_filter filter_code[] = {
	// Reject all.
	BPF_STMT(BPF_RET \| BPF_K, 0)
	};
	struct sock_fprog filter = {
	sizeof(filter_code) / sizeof(filter_code[0]),
	filter_code,
	};

	int fd = jniGetFDFromFileDescriptor(env, javaFd);
	if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter)) != 0) {
	jniThrowExceptionFmt(env, "java/net/SocketException",
	"setsockopt(SO_ATTACH_FILTER): %s", strerror(errno));
	}
	}

	static void android_net_utils_detachBPFFilter(JNIEnv *env, jobject clazz, jobject javaFd)
	{
	int optval_ignored = 0;
	int fd = jniGetFDFromFileDescriptor(env, javaFd);
	if (setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, &optval_ignored, sizeof(optval_ignored)) !=
	0) {
	jniThrowExceptionFmt(env, "java/net/SocketException",
	"setsockopt(SO_DETACH_FILTER): %s", strerror(errno));
	}
	}

	static jboolean android_net_utils_bindProcessToNetwork(JNIEnv *env, jobject thiz, jint netId)
	{
	return (jboolean) !setNetworkForProcess(netId);
	}

	static jint android_net_utils_getBoundNetworkForProcess(JNIEnv *env, jobject thiz)
	{
	return getNetworkForProcess();
	}

	static jboolean android_net_utils_bindProcessToNetworkForHostResolution(JNIEnv *env, jobject thiz,
	jint netId)
	{
	return (jboolean) !setNetworkForResolv(netId);
	}

	static jint android_net_utils_bindSocketToNetwork(JNIEnv *env, jobject thiz, jint socket,
	jint netId)
	{
	return setNetworkForSocket(netId, socket);
	}

	static jboolean android_net_utils_protectFromVpn(JNIEnv *env, jobject thiz, jint socket)
	{
	return (jboolean) !protectFromVpn(socket);
	}

	static jboolean android_net_utils_queryUserAccess(JNIEnv *env, jobject thiz, jint uid, jint netId)
	{
	return (jboolean) !queryUserAccess(uid, netId);
	}

	static bool checkLenAndCopy(JNIEnv* env, const jbyteArray& addr, int len, void* dst)
	{
	if (env->GetArrayLength(addr) != len) {
	return false;
	}
	env->GetByteArrayRegion(addr, 0, len, reinterpret_cast<jbyte*>(dst));
	return true;
	}

	static jobject android_net_utils_resNetworkQuery(JNIEnv *env, jobject thiz, jint netId,
	jstring dname, jint ns_class, jint ns_type, jint flags) {
	const jsize javaCharsCount = env->GetStringLength(dname);
	const jsize byteCountUTF8 = env->GetStringUTFLength(dname);

	// Only allow dname which could be simply formatted to UTF8.
	// In native layer, res_mkquery would re-format the input char array to packet.
	std::vector<char> queryname(byteCountUTF8 + 1, 0);

	env->GetStringUTFRegion(dname, 0, javaCharsCount, queryname.data());
	int fd = resNetworkQuery(netId, queryname.data(), ns_class, ns_type, flags);

	if (fd < 0) {
	throwErrnoException(env, "resNetworkQuery", -fd);
	return nullptr;
	}

	return jniCreateFileDescriptor(env, fd);
	}

	static jobject android_net_utils_resNetworkSend(JNIEnv *env, jobject thiz, jint netId,
	jbyteArray msg, jint msgLen, jint flags) {
	uint8_t data[MAXCMDSIZE];

	checkLenAndCopy(env, msg, msgLen, data);
	int fd = resNetworkSend(netId, data, msgLen, flags);

	if (fd < 0) {
	throwErrnoException(env, "resNetworkSend", -fd);
	return nullptr;
	}

	return jniCreateFileDescriptor(env, fd);
	}

	static jobject android_net_utils_resNetworkResult(JNIEnv *env, jobject thiz, jobject javaFd) {
	int fd = jniGetFDFromFileDescriptor(env, javaFd);
	int rcode;
	std::vector<uint8_t> buf(MAXPACKETSIZE, 0);

	int res = resNetworkResult(fd, &rcode, buf.data(), MAXPACKETSIZE);
	jniSetFileDescriptorOfFD(env, javaFd, -1);
	if (res < 0) {
	throwErrnoException(env, "resNetworkResult", -res);
	return nullptr;
	}

	jbyteArray answer = env->NewByteArray(res);
	if (answer == nullptr) {
	throwErrnoException(env, "resNetworkResult", ENOMEM);
	return nullptr;
	} else {
	env->SetByteArrayRegion(answer, 0, res,
	reinterpret_cast<jbyte*>(buf.data()));
	}

	jclass class_DnsResponse = env->FindClass("android/net/DnsResolver$DnsResponse");
	jmethodID ctor = env->GetMethodID(class_DnsResponse, "<init>", "([BI)V");

	return env->NewObject(class_DnsResponse, ctor, answer, rcode);
	}

	static void android_net_utils_resNetworkCancel(JNIEnv *env, jobject thiz, jobject javaFd) {
	int fd = jniGetFDFromFileDescriptor(env, javaFd);
	resNetworkCancel(fd);
	jniSetFileDescriptorOfFD(env, javaFd, -1);
	}

	static jobject android_net_utils_getDnsNetwork(JNIEnv *env, jobject thiz) {
	unsigned dnsNetId = 0;
	if (int res = getNetworkForDns(&dnsNetId) < 0) {
	throwErrnoException(env, "getDnsNetId", -res);
	return nullptr;
	}
	bool privateDnsBypass = dnsNetId & NETID_USE_LOCAL_NAMESERVERS;

	static jclass class_Network = MakeGlobalRefOrDie(
	env, FindClassOrDie(env, "android/net/Network"));
	static jmethodID ctor = env->GetMethodID(class_Network, "<init>", "(IZ)V");
	return env->NewObject(
	class_Network, ctor, dnsNetId & ~NETID_USE_LOCAL_NAMESERVERS, privateDnsBypass);
	}

	static jobject android_net_utils_getTcpRepairWindow(JNIEnv *env, jobject thiz, jobject javaFd) {
	if (javaFd == NULL) {
	jniThrowNullPointerException(env, NULL);
	return NULL;
	}

	int fd = jniGetFDFromFileDescriptor(env, javaFd);
	struct tcp_repair_window trw = {};
	socklen_t size = sizeof(trw);

	// Obtain the parameters of the TCP repair window.
	int rc = getsockopt(fd, IPPROTO_TCP, TCP_REPAIR_WINDOW, &trw, &size);
	if (rc == -1) {
	throwErrnoException(env, "getsockopt : TCP_REPAIR_WINDOW", errno);
	return NULL;
	}

	struct tcp_info tcpinfo = {};
	socklen_t tcpinfo_size = sizeof(tcp_info);

	// Obtain the window scale from the tcp info structure. This contains a scale factor that
	// should be applied to the window size.
	rc = getsockopt(fd, IPPROTO_TCP, TCP_INFO, &tcpinfo, &tcpinfo_size);
	if (rc == -1) {
	throwErrnoException(env, "getsockopt : TCP_INFO", errno);
	return NULL;
	}

	jclass class_TcpRepairWindow = env->FindClass("android/net/TcpRepairWindow");
	jmethodID ctor = env->GetMethodID(class_TcpRepairWindow, "<init>", "(IIIIII)V");

	return env->NewObject(class_TcpRepairWindow, ctor, trw.snd_wl1, trw.snd_wnd, trw.max_window,
	trw.rcv_wnd, trw.rcv_wup, tcpinfo.tcpi_rcv_wscale);
	}

	// ----------------------------------------------------------------------------

	/*
	* JNI registration.
	*/
	// clang-format off
	static const JNINativeMethod gNetworkUtilMethods[] = {
	/* name, signature, funcPtr */
	{ "bindProcessToNetwork", "(I)Z", (void*) android_net_utils_bindProcessToNetwork },
	{ "getBoundNetworkForProcess", "()I", (void*) android_net_utils_getBoundNetworkForProcess },
	{ "bindProcessToNetworkForHostResolution", "(I)Z", (void*) android_net_utils_bindProcessToNetworkForHostResolution },
	{ "bindSocketToNetwork", "(II)I", (void*) android_net_utils_bindSocketToNetwork },
	{ "protectFromVpn", "(I)Z", (void*)android_net_utils_protectFromVpn },
	{ "queryUserAccess", "(II)Z", (void*)android_net_utils_queryUserAccess },
	{ "attachDropAllBPFFilter", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_attachDropAllBPFFilter },
	{ "detachBPFFilter", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_detachBPFFilter },
	{ "getTcpRepairWindow", "(Ljava/io/FileDescriptor;)Landroid/net/TcpRepairWindow;", (void*) android_net_utils_getTcpRepairWindow },
	{ "resNetworkSend", "(I[BII)Ljava/io/FileDescriptor;", (void*) android_net_utils_resNetworkSend },
	{ "resNetworkQuery", "(ILjava/lang/String;III)Ljava/io/FileDescriptor;", (void*) android_net_utils_resNetworkQuery },
	{ "resNetworkResult", "(Ljava/io/FileDescriptor;)Landroid/net/DnsResolver$DnsResponse;", (void*) android_net_utils_resNetworkResult },
	{ "resNetworkCancel", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_resNetworkCancel },
	{ "getDnsNetwork", "()Landroid/net/Network;", (void*) android_net_utils_getDnsNetwork },
	};
	// clang-format on

	int register_android_net_NetworkUtils(JNIEnv* env)
	{
	return RegisterMethodsOrDie(env, NETUTILS_PKG_NAME, gNetworkUtilMethods,
	NELEM(gNetworkUtilMethods));
	}

	}; // namespace android