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 "JNIHelp.h"
 #include "NetdClient.h"
 #include <utils/misc.h>
 #include <android_runtime/AndroidRuntime.h>
 #include <utils/Log.h>
 #include <arpa/inet.h>
 #include <net/if.h>
 #include <linux/filter.h>
 #include <linux/if.h>
 #include <linux/if_ether.h>
 #include <linux/if_packet.h>
 #include <net/if_ether.h>
 #include <netinet/ip.h>
 #include <netinet/udp.h>
 #include <cutils/properties.h>

 #include "core_jni_helpers.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_start(const char * const ifname);
 int dhcp_start_renew(const char * const ifname);
 int dhcp_get_results(const char * const ifname,
                      const char *ipaddr,
                      const char *gateway,
                      uint32_t *prefixLength,
                      const char *dns[],
                      const char *server,
                      uint32_t *lease,
                      const char *vendorInfo,
                      const char *domains,
                      const char *mtu);

 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 {

 static const uint16_t kDhcpClientPort = 68;

 /*
  * 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 clear;
     jmethodID setIpAddress;
     jmethodID setGateway;
     jmethodID addDns;
     jmethodID setDomains;
     jmethodID setServerAddress;
     jmethodID setLeaseDuration;
     jmethodID setVendorInfo;
 } dhcpResultsFieldIds;

 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_getDhcpResults(JNIEnv* env, jobject clazz, jstring ifname,
         jobject dhcpResults)
 {
     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    dns3[PROPERTY_VALUE_MAX];
     char    dns4[PROPERTY_VALUE_MAX];
     const char *dns[5] = {dns1, dns2, dns3, dns4, NULL};
     char  server[PROPERTY_VALUE_MAX];
     uint32_t lease;
     char vendorInfo[PROPERTY_VALUE_MAX];
     char domains[PROPERTY_VALUE_MAX];
     char mtu[PROPERTY_VALUE_MAX];

     const char *nameStr = env->GetStringUTFChars(ifname, NULL);
     if (nameStr == NULL) return (jboolean)false;

     result = ::dhcp_get_results(nameStr, ipaddr, gateway, &prefixLength,
             dns, server, &lease, vendorInfo, domains, mtu);
     if (result != 0) {
         ALOGD("dhcp_get_results failed : %s (%s)", nameStr, ::dhcp_get_errmsg());
     }

     env->ReleaseStringUTFChars(ifname, nameStr);
     if (result == 0) {
         env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.clear);

         // set the linkAddress
         // dhcpResults->addLinkAddress(inetAddress, prefixLength)
         result = env->CallBooleanMethod(dhcpResults, dhcpResultsFieldIds.setIpAddress,
                 env->NewStringUTF(ipaddr), prefixLength);
     }

     if (result == 0) {
         // set the gateway
         result = env->CallBooleanMethod(dhcpResults,
                 dhcpResultsFieldIds.setGateway, env->NewStringUTF(gateway));
     }

     if (result == 0) {
         // dhcpResults->addDns(new InetAddress(dns1))
         result = env->CallBooleanMethod(dhcpResults,
                 dhcpResultsFieldIds.addDns, env->NewStringUTF(dns1));
     }

     if (result == 0) {
         env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.setDomains,
                 env->NewStringUTF(domains));

         result = env->CallBooleanMethod(dhcpResults,
                 dhcpResultsFieldIds.addDns, env->NewStringUTF(dns2));

         if (result == 0) {
             result = env->CallBooleanMethod(dhcpResults,
                     dhcpResultsFieldIds.addDns, env->NewStringUTF(dns3));
             if (result == 0) {
                 result = env->CallBooleanMethod(dhcpResults,
                         dhcpResultsFieldIds.addDns, env->NewStringUTF(dns4));
             }
         }
     }

     if (result == 0) {
         // dhcpResults->setServerAddress(new InetAddress(server))
         result = env->CallBooleanMethod(dhcpResults, dhcpResultsFieldIds.setServerAddress,
                 env->NewStringUTF(server));
     }

     if (result == 0) {
         // dhcpResults->setLeaseDuration(lease)
         env->CallVoidMethod(dhcpResults,
                 dhcpResultsFieldIds.setLeaseDuration, lease);

         // dhcpResults->setVendorInfo(vendorInfo)
         env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.setVendorInfo,
                 env->NewStringUTF(vendorInfo));
     }
     return (jboolean)(result == 0);
 }

 static jboolean android_net_utils_startDhcp(JNIEnv* env, jobject clazz, jstring ifname)
 {
     const char *nameStr = env->GetStringUTFChars(ifname, NULL);
     if (nameStr == NULL) return (jboolean)false;
     if (::dhcp_start(nameStr) != 0) {
         ALOGD("dhcp_start failed : %s", nameStr);
         return (jboolean)false;
     }
     return (jboolean)true;
 }

 static jboolean android_net_utils_startDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname)
 {
     const char *nameStr = env->GetStringUTFChars(ifname, NULL);
     if (nameStr == NULL) return (jboolean)false;
     if (::dhcp_start_renew(nameStr) != 0) {
         ALOGD("dhcp_start_renew failed : %s", nameStr);
         return (jboolean)false;
     }
     return (jboolean)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());
 }

 static void android_net_utils_attachDhcpFilter(JNIEnv *env, jobject clazz, jobject javaFd)
 {
     int fd = jniGetFDFromFileDescriptor(env, javaFd);
     uint32_t ip_offset = sizeof(ether_header);
     uint32_t proto_offset = ip_offset + offsetof(iphdr, protocol);
     uint32_t flags_offset = ip_offset +  offsetof(iphdr, frag_off);
     uint32_t dport_indirect_offset = ip_offset + offsetof(udphdr, dest);
     struct sock_filter filter_code[] = {
         // Check the protocol is UDP.
         BPF_STMT(BPF_LD  | BPF_B   | BPF_ABS,  proto_offset),
         BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K,    IPPROTO_UDP, 0, 6),

         // Check this is not a fragment.
         BPF_STMT(BPF_LD  | BPF_H    | BPF_ABS, flags_offset),
         BPF_JUMP(BPF_JMP | BPF_JSET | BPF_K,   0x1fff, 4, 0),

         // Get the IP header length.
         BPF_STMT(BPF_LDX | BPF_B    | BPF_MSH, ip_offset),

         // Check the destination port.
         BPF_STMT(BPF_LD  | BPF_H    | BPF_IND, dport_indirect_offset),
         BPF_JUMP(BPF_JMP | BPF_JEQ  | BPF_K,   kDhcpClientPort, 0, 1),

         // Accept or reject.
         BPF_STMT(BPF_RET | BPF_K,              0xffff),
         BPF_STMT(BPF_RET | BPF_K,              0)
     };
     struct sock_fprog filter = {
         sizeof(filter_code) / sizeof(filter_code[0]),
         filter_code,
     };

     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 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);
 }


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

 /*
  * JNI registration.
  */
 static JNINativeMethod gNetworkUtilMethods[] = {
     /* name, signature, funcPtr */
     { "resetConnections", "(Ljava/lang/String;I)I",  (void *)android_net_utils_resetConnections },
     { "startDhcp", "(Ljava/lang/String;)Z",  (void *)android_net_utils_startDhcp },
     { "startDhcpRenew", "(Ljava/lang/String;)Z",  (void *)android_net_utils_startDhcpRenew },
     { "getDhcpResults", "(Ljava/lang/String;Landroid/net/DhcpResults;)Z",  (void *)android_net_utils_getDhcpResults },
     { "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 },
     { "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 },
     { "attachDhcpFilter", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_attachDhcpFilter },
 };

 int register_android_net_NetworkUtils(JNIEnv* env)
 {
     jclass dhcpResultsClass = FindClassOrDie(env, "android/net/DhcpResults");

     dhcpResultsFieldIds.clear = GetMethodIDOrDie(env, dhcpResultsClass, "clear", "()V");
     dhcpResultsFieldIds.setIpAddress =GetMethodIDOrDie(env, dhcpResultsClass, "setIpAddress",
             "(Ljava/lang/String;I)Z");
     dhcpResultsFieldIds.setGateway = GetMethodIDOrDie(env, dhcpResultsClass, "setGateway",
             "(Ljava/lang/String;)Z");
     dhcpResultsFieldIds.addDns = GetMethodIDOrDie(env, dhcpResultsClass, "addDns",
             "(Ljava/lang/String;)Z");
     dhcpResultsFieldIds.setDomains = GetMethodIDOrDie(env, dhcpResultsClass, "setDomains",
             "(Ljava/lang/String;)V");
     dhcpResultsFieldIds.setServerAddress = GetMethodIDOrDie(env, dhcpResultsClass,
             "setServerAddress", "(Ljava/lang/String;)Z");
     dhcpResultsFieldIds.setLeaseDuration = GetMethodIDOrDie(env, dhcpResultsClass,
             "setLeaseDuration", "(I)V");
     dhcpResultsFieldIds.setVendorInfo = GetMethodIDOrDie(env, dhcpResultsClass, "setVendorInfo",
             "(Ljava/lang/String;)V");

     return RegisterMethodsOrDie(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 "JNIHelp.h"
	#include "NetdClient.h"
	#include <utils/misc.h>
	#include <android_runtime/AndroidRuntime.h>
	#include <utils/Log.h>
	#include <arpa/inet.h>
	#include <net/if.h>
	#include <linux/filter.h>
	#include <linux/if.h>
	#include <linux/if_ether.h>
	#include <linux/if_packet.h>
	#include <net/if_ether.h>
	#include <netinet/ip.h>
	#include <netinet/udp.h>
	#include <cutils/properties.h>

	#include "core_jni_helpers.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_start(const char * const ifname);
	int dhcp_start_renew(const char * const ifname);
	int dhcp_get_results(const char * const ifname,
	const char *ipaddr,
	const char *gateway,
	uint32_t *prefixLength,
	const char *dns[],
	const char *server,
	uint32_t *lease,
	const char *vendorInfo,
	const char *domains,
	const char *mtu);

	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 {

	static const uint16_t kDhcpClientPort = 68;

	/*
	* 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 clear;
	jmethodID setIpAddress;
	jmethodID setGateway;
	jmethodID addDns;
	jmethodID setDomains;
	jmethodID setServerAddress;
	jmethodID setLeaseDuration;
	jmethodID setVendorInfo;
	} dhcpResultsFieldIds;

	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_getDhcpResults(JNIEnv* env, jobject clazz, jstring ifname,
	jobject dhcpResults)
	{
	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 dns3[PROPERTY_VALUE_MAX];
	char dns4[PROPERTY_VALUE_MAX];
	const char *dns[5] = {dns1, dns2, dns3, dns4, NULL};
	char server[PROPERTY_VALUE_MAX];
	uint32_t lease;
	char vendorInfo[PROPERTY_VALUE_MAX];
	char domains[PROPERTY_VALUE_MAX];
	char mtu[PROPERTY_VALUE_MAX];

	const char *nameStr = env->GetStringUTFChars(ifname, NULL);
	if (nameStr == NULL) return (jboolean)false;

	result = ::dhcp_get_results(nameStr, ipaddr, gateway, &prefixLength,
	dns, server, &lease, vendorInfo, domains, mtu);
	if (result != 0) {
	ALOGD("dhcp_get_results failed : %s (%s)", nameStr, ::dhcp_get_errmsg());
	}

	env->ReleaseStringUTFChars(ifname, nameStr);
	if (result == 0) {
	env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.clear);

	// set the linkAddress
	// dhcpResults->addLinkAddress(inetAddress, prefixLength)
	result = env->CallBooleanMethod(dhcpResults, dhcpResultsFieldIds.setIpAddress,
	env->NewStringUTF(ipaddr), prefixLength);
	}

	if (result == 0) {
	// set the gateway
	result = env->CallBooleanMethod(dhcpResults,
	dhcpResultsFieldIds.setGateway, env->NewStringUTF(gateway));
	}

	if (result == 0) {
	// dhcpResults->addDns(new InetAddress(dns1))
	result = env->CallBooleanMethod(dhcpResults,
	dhcpResultsFieldIds.addDns, env->NewStringUTF(dns1));
	}

	if (result == 0) {
	env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.setDomains,
	env->NewStringUTF(domains));

	result = env->CallBooleanMethod(dhcpResults,
	dhcpResultsFieldIds.addDns, env->NewStringUTF(dns2));

	if (result == 0) {
	result = env->CallBooleanMethod(dhcpResults,
	dhcpResultsFieldIds.addDns, env->NewStringUTF(dns3));
	if (result == 0) {
	result = env->CallBooleanMethod(dhcpResults,
	dhcpResultsFieldIds.addDns, env->NewStringUTF(dns4));
	}
	}
	}

	if (result == 0) {
	// dhcpResults->setServerAddress(new InetAddress(server))
	result = env->CallBooleanMethod(dhcpResults, dhcpResultsFieldIds.setServerAddress,
	env->NewStringUTF(server));
	}

	if (result == 0) {
	// dhcpResults->setLeaseDuration(lease)
	env->CallVoidMethod(dhcpResults,
	dhcpResultsFieldIds.setLeaseDuration, lease);

	// dhcpResults->setVendorInfo(vendorInfo)
	env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.setVendorInfo,
	env->NewStringUTF(vendorInfo));
	}
	return (jboolean)(result == 0);
	}

	static jboolean android_net_utils_startDhcp(JNIEnv* env, jobject clazz, jstring ifname)
	{
	const char *nameStr = env->GetStringUTFChars(ifname, NULL);
	if (nameStr == NULL) return (jboolean)false;
	if (::dhcp_start(nameStr) != 0) {
	ALOGD("dhcp_start failed : %s", nameStr);
	return (jboolean)false;
	}
	return (jboolean)true;
	}

	static jboolean android_net_utils_startDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname)
	{
	const char *nameStr = env->GetStringUTFChars(ifname, NULL);
	if (nameStr == NULL) return (jboolean)false;
	if (::dhcp_start_renew(nameStr) != 0) {
	ALOGD("dhcp_start_renew failed : %s", nameStr);
	return (jboolean)false;
	}
	return (jboolean)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());
	}

	static void android_net_utils_attachDhcpFilter(JNIEnv *env, jobject clazz, jobject javaFd)
	{
	int fd = jniGetFDFromFileDescriptor(env, javaFd);
	uint32_t ip_offset = sizeof(ether_header);
	uint32_t proto_offset = ip_offset + offsetof(iphdr, protocol);
	uint32_t flags_offset = ip_offset + offsetof(iphdr, frag_off);
	uint32_t dport_indirect_offset = ip_offset + offsetof(udphdr, dest);
	struct sock_filter filter_code[] = {
	// Check the protocol is UDP.
	BPF_STMT(BPF_LD \| BPF_B \| BPF_ABS, proto_offset),
	BPF_JUMP(BPF_JMP \| BPF_JEQ \| BPF_K, IPPROTO_UDP, 0, 6),

	// Check this is not a fragment.
	BPF_STMT(BPF_LD \| BPF_H \| BPF_ABS, flags_offset),
	BPF_JUMP(BPF_JMP \| BPF_JSET \| BPF_K, 0x1fff, 4, 0),

	// Get the IP header length.
	BPF_STMT(BPF_LDX \| BPF_B \| BPF_MSH, ip_offset),

	// Check the destination port.
	BPF_STMT(BPF_LD \| BPF_H \| BPF_IND, dport_indirect_offset),
	BPF_JUMP(BPF_JMP \| BPF_JEQ \| BPF_K, kDhcpClientPort, 0, 1),

	// Accept or reject.
	BPF_STMT(BPF_RET \| BPF_K, 0xffff),
	BPF_STMT(BPF_RET \| BPF_K, 0)
	};
	struct sock_fprog filter = {
	sizeof(filter_code) / sizeof(filter_code[0]),
	filter_code,
	};

	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 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);
	}


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

	/*
	* JNI registration.
	*/
	static JNINativeMethod gNetworkUtilMethods[] = {
	/* name, signature, funcPtr */
	{ "resetConnections", "(Ljava/lang/String;I)I", (void *)android_net_utils_resetConnections },
	{ "startDhcp", "(Ljava/lang/String;)Z", (void *)android_net_utils_startDhcp },
	{ "startDhcpRenew", "(Ljava/lang/String;)Z", (void *)android_net_utils_startDhcpRenew },
	{ "getDhcpResults", "(Ljava/lang/String;Landroid/net/DhcpResults;)Z", (void *)android_net_utils_getDhcpResults },
	{ "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 },
	{ "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 },
	{ "attachDhcpFilter", "(Ljava/io/FileDescriptor;)V", (void*) android_net_utils_attachDhcpFilter },
	};

	int register_android_net_NetworkUtils(JNIEnv* env)
	{
	jclass dhcpResultsClass = FindClassOrDie(env, "android/net/DhcpResults");

	dhcpResultsFieldIds.clear = GetMethodIDOrDie(env, dhcpResultsClass, "clear", "()V");
	dhcpResultsFieldIds.setIpAddress =GetMethodIDOrDie(env, dhcpResultsClass, "setIpAddress",
	"(Ljava/lang/String;I)Z");
	dhcpResultsFieldIds.setGateway = GetMethodIDOrDie(env, dhcpResultsClass, "setGateway",
	"(Ljava/lang/String;)Z");
	dhcpResultsFieldIds.addDns = GetMethodIDOrDie(env, dhcpResultsClass, "addDns",
	"(Ljava/lang/String;)Z");
	dhcpResultsFieldIds.setDomains = GetMethodIDOrDie(env, dhcpResultsClass, "setDomains",
	"(Ljava/lang/String;)V");
	dhcpResultsFieldIds.setServerAddress = GetMethodIDOrDie(env, dhcpResultsClass,
	"setServerAddress", "(Ljava/lang/String;)Z");
	dhcpResultsFieldIds.setLeaseDuration = GetMethodIDOrDie(env, dhcpResultsClass,
	"setLeaseDuration", "(I)V");
	dhcpResultsFieldIds.setVendorInfo = GetMethodIDOrDie(env, dhcpResultsClass, "setVendorInfo",
	"(Ljava/lang/String;)V");

	return RegisterMethodsOrDie(env, NETUTILS_PKG_NAME, gNetworkUtilMethods,
	NELEM(gNetworkUtilMethods));
	}

	}; // namespace android