Java FFM的TUN虚拟网卡封装
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package org.kne.cloud.network.tun;
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import java.lang.foreign.*;
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import java.lang.invoke.MethodHandle;
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import java.nio.charset.Charset;
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import java.util.*;
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import org.kne.cloud.network.tun.WindowsInterfaceConverter.GUID;
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/**
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* Windows DNS 设置管理类
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* 支持获取、设置和修改网络接口的 DNS 配置
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*/
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public class WindowsDNSManager {
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// 内存布局
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public static final AddressLayout POINTER = ValueLayout.ADDRESS;
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public static final ValueLayout.OfInt DWORD = ValueLayout.JAVA_INT;
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public static final ValueLayout.OfLong DWORD64 = ValueLayout.JAVA_LONG;
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public static final ValueLayout.OfByte BYTE = ValueLayout.JAVA_BYTE;
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public static final ValueLayout.OfShort WORD = ValueLayout.JAVA_SHORT;
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// DNS 设置常量
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public static final int DNS_SETTINGS_VERSION1 = 0x0001;
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public static final int DNS_INTERFACE_SETTINGS_VERSION1 = 0x0001;
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public static final int DNS_INTERFACE_SETTINGS_VERSION2 = 0x0002;
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// DNS 设置标志
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public static final long DNS_SETTING_IPV6 = 0x0001L;
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public static final long DNS_SETTING_NAMESERVER = 0x0002L;
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public static final long DNS_SETTING_SEARCHLIST = 0x0004L;
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public static final long DNS_SETTING_REGISTRATION_ENABLED = 0x0008L;
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public static final long DNS_SETTING_REGISTER_ADAPTER_NAME = 0x0010L;
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public static final long DNS_SETTING_DOMAIN = 0x0020L;
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public static final long DNS_SETTING_HOSTNAME = 0x0040L;
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public static final long DNS_SETTINGS_ENABLE_LLMNR = 0x0080L;
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public static final long DNS_SETTINGS_QUERY_ADAPTER_NAME = 0x0100L;
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public static final long DNS_SETTING_PROFILE_NAMESERVER = 0x0200L;
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public static final long DNS_SETTING_DISABLE_UNCONSTRAINED_QUERIES = 0x0400L;
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public static final long DNS_SETTING_SUPPLEMENTAL_SEARCH_LIST = 0x0800L;
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// DNS_SETTINGS 结构体布局 (通用 DNS 设置)
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public static final GroupLayout DNS_SETTINGS_LAYOUT = MemoryLayout.structLayout(
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DWORD.withName("Version"), // ULONG Version
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MemoryLayout.paddingLayout(4),
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DWORD64.withName("Flags"), // ULONG64 Flags
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POINTER.withName("Hostname"), // PWSTR Hostname
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POINTER.withName("Domain"), // PWSTR Domain
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POINTER.withName("SearchList") // PWSTR SearchList
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);
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// DNS_INTERFACE_SETTINGS 结构体布局 (接口特定 DNS 设置 V1)
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public static final GroupLayout DNS_INTERFACE_SETTINGS_LAYOUT = MemoryLayout.structLayout(
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DWORD.withName("Version"), // ULONG Version
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MemoryLayout.paddingLayout(4),
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DWORD64.withName("Flags"), // ULONG64 Flags
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POINTER.withName("Domain"), // PWSTR Domain
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POINTER.withName("NameServer"), // PWSTR NameServer
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POINTER.withName("SearchList"), // PWSTR SearchList
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DWORD.withName("RegistrationEnabled"), // ULONG RegistrationEnabled
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DWORD.withName("RegisterAdapterName"), // ULONG RegisterAdapterName
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DWORD.withName("EnableLLMNR"), // ULONG EnableLLMNR
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DWORD.withName("QueryAdapterName"), // ULONG QueryAdapterName
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POINTER.withName("ProfileNameServer") // PWSTR ProfileNameServer
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);
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// DNS_INTERFACE_SETTINGS_EX 结构体布局 (扩展版本)
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public static final GroupLayout DNS_INTERFACE_SETTINGS_EX_LAYOUT = MemoryLayout.structLayout(
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DNS_INTERFACE_SETTINGS_LAYOUT.withName("SettingsV1"),
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DWORD.withName("DisableUnconstrainedQueries"), // ULONG DisableUnconstrainedQueries
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MemoryLayout.paddingLayout(4),
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POINTER.withName("SupplementalSearchList") // PWSTR SupplementalSearchList
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);
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private static final SymbolLookup LOOKUP;
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private static final Linker LINKER = Linker.nativeLinker();
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// 方法句柄
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private static final MethodHandle GET_INTERFACE_DNS_SETTINGS;
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private static final MethodHandle FREE_INTERFACE_DNS_SETTINGS;
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private static final MethodHandle SET_INTERFACE_DNS_SETTINGS;
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private static final MethodHandle FREE_DNS_SETTINGS;
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private static final MethodHandle GET_DNS_SETTINGS;
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static {
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try {
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// 加载 dnsapi.dll
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System.loadLibrary("dnsapi");
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LOOKUP = SymbolLookup.loaderLookup();
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// GetInterfaceDnsSettings 函数
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// DWORD GetInterfaceDnsSettings(GUID *Interface, DNS_INTERFACE_SETTINGS *Settings);
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FunctionDescriptor getInterfaceDnsSettingsDesc = FunctionDescriptor.of(
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DWORD, // 返回值: DWORD
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POINTER, // Interface: GUID*
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POINTER // Settings: DNS_INTERFACE_SETTINGS*
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);
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// SetInterfaceDnsSettings 函数
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// DWORD SetInterfaceDnsSettings(GUID *Interface, DNS_INTERFACE_SETTINGS *Settings);
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FunctionDescriptor setInterfaceDnsSettingsDesc = FunctionDescriptor.of(
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DWORD, // 返回值: DWORD
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POINTER, // Interface: GUID*
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POINTER // Settings: DNS_INTERFACE_SETTINGS*
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);
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FunctionDescriptor freeInterfaceDnsSettingsDesc = FunctionDescriptor.ofVoid(
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POINTER
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);
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// FreeDnsSettings 函数
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// VOID FreeDnsSettings(DNS_SETTINGS *Settings);
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FunctionDescriptor freeDnsSettingsDesc = FunctionDescriptor.ofVoid(
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POINTER // Settings: DNS_SETTINGS*
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);
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// GetDnsSettings 函数
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// DWORD GetDnsSettings(DNS_SETTINGS *Settings);
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FunctionDescriptor getDnsSettingsDesc = FunctionDescriptor.of(
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DWORD, // 返回值: DWORD
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POINTER // Settings: DNS_SETTINGS*
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);
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// 获取方法句柄
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GET_INTERFACE_DNS_SETTINGS = LINKER.downcallHandle(
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LOOKUP.find("GetInterfaceDnsSettings").orElseThrow(),
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getInterfaceDnsSettingsDesc
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);
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SET_INTERFACE_DNS_SETTINGS = LINKER.downcallHandle(
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LOOKUP.find("SetInterfaceDnsSettings").orElseThrow(),
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setInterfaceDnsSettingsDesc
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);
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FREE_DNS_SETTINGS = LINKER.downcallHandle(
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LOOKUP.find("FreeDnsSettings").orElseThrow(),
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freeInterfaceDnsSettingsDesc
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);
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FREE_INTERFACE_DNS_SETTINGS = LINKER.downcallHandle(
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LOOKUP.find("FreeInterfaceDnsSettings").orElseThrow(),
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freeDnsSettingsDesc
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);
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GET_DNS_SETTINGS = LINKER.downcallHandle(
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LOOKUP.find("GetDnsSettings").orElseThrow(),
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getDnsSettingsDesc
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);
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} catch (Throwable e) {
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throw new RuntimeException("Failed to initialize Windows DNS manager", e);
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}
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}
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/**
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* DNS 设置信息类 (Java 对象版本)
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*/
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public static class DnsInterfaceSettings {
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private int version;
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private long flags;
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private String domain;
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private List<String> nameServers;
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private List<String> searchList;
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private boolean registrationEnabled;
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private boolean registerAdapterName;
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private boolean enableLLMNR;
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private boolean queryAdapterName;
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private String profileNameServer;
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private boolean disableUnconstrainedQueries;
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private List<String> supplementalSearchList;
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public DnsInterfaceSettings() {
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this.version = DNS_INTERFACE_SETTINGS_VERSION1;
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this.flags = 0;
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}
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// Getters and Setters
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public int getVersion() { return version; }
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public void setVersion(int version) { this.version = version; }
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public long getFlags() { return flags; }
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public void setFlags(long flags) { this.flags = flags; }
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public String getDomain() { return domain; }
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public void setDomain(String domain) { this.domain = domain; }
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public List<String> getNameServers() { return nameServers; }
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public void setNameServers(List<String> nameServers) { this.nameServers = nameServers; }
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public List<String> getSearchList() { return searchList; }
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public void setSearchList(List<String> searchList) { this.searchList = searchList; }
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public boolean isRegistrationEnabled() { return registrationEnabled; }
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public void setRegistrationEnabled(boolean registrationEnabled) {
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this.registrationEnabled = registrationEnabled;
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}
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public boolean isRegisterAdapterName() { return registerAdapterName; }
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public void setRegisterAdapterName(boolean registerAdapterName) {
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this.registerAdapterName = registerAdapterName;
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}
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public boolean isEnableLLMNR() { return enableLLMNR; }
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public void setEnableLLMNR(boolean enableLLMNR) { this.enableLLMNR = enableLLMNR; }
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public boolean isQueryAdapterName() { return queryAdapterName; }
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public void setQueryAdapterName(boolean queryAdapterName) {
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this.queryAdapterName = queryAdapterName;
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}
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public String getProfileNameServer() { return profileNameServer; }
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public void setProfileNameServer(String profileNameServer) {
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this.profileNameServer = profileNameServer;
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}
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public boolean isDisableUnconstrainedQueries() { return disableUnconstrainedQueries; }
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public void setDisableUnconstrainedQueries(boolean disableUnconstrainedQueries) {
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this.disableUnconstrainedQueries = disableUnconstrainedQueries;
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}
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public List<String> getSupplementalSearchList() { return supplementalSearchList; }
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public void setSupplementalSearchList(List<String> supplementalSearchList) {
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this.supplementalSearchList = supplementalSearchList;
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}
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder();
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sb.append("DNS Interface Settings:\n");
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sb.append(" Version: ").append(version).append("\n");
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sb.append(" Flags: 0x").append(Long.toHexString(flags)).append("\n");
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sb.append(" Domain: ").append(domain != null ? domain : "(null)").append("\n");
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sb.append(" Name Servers: ").append(nameServers).append("\n");
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sb.append(" Search List: ").append(searchList).append("\n");
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sb.append(" Registration Enabled: ").append(registrationEnabled).append("\n");
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sb.append(" Register Adapter Name: ").append(registerAdapterName).append("\n");
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sb.append(" Enable LLMNR: ").append(enableLLMNR).append("\n");
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sb.append(" Query Adapter Name: ").append(queryAdapterName).append("\n");
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sb.append(" Profile Name Server: ").append(profileNameServer).append("\n");
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sb.append(" Disable Unconstrained Queries: ").append(disableUnconstrainedQueries).append("\n");
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sb.append(" Supplemental Search List: ").append(supplementalSearchList);
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return sb.toString();
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}
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}
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/**
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* 从网卡获取 DNS 设置
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* @param interfaceGuid 网卡的 GUID
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* @return DNS 设置对象
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*/
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public static DnsInterfaceSettings getInterfaceDnsSettings(GUID interfaceGuid,DnsInterfaceSettings oldSettings) {
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try (Arena arena = Arena.ofConfined()) {
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// 创建 GUID 内存段
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MemorySegment guidSegment = interfaceGuid.toMemorySegment( arena);
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// 分配 DNS_INTERFACE_SETTINGS 结构体 (版本1)
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MemorySegment dnsSettings = createDnsInterfaceSettingsMemory(oldSettings, arena);
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// 设置版本
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dnsSettings.set(DWORD, 0, DNS_INTERFACE_SETTINGS_VERSION1);
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// 调用 GetInterfaceDnsSettings
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int result = (int) GET_INTERFACE_DNS_SETTINGS.invokeExact(
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guidSegment,
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dnsSettings
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);
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if (result != 0) { // NO_ERROR = 0
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throw new WindowsAPIException("GetInterfaceDnsSettings failed", result);
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}
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DnsInterfaceSettings resultv=parseDnsInterfaceSettings(dnsSettings, arena);
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FREE_INTERFACE_DNS_SETTINGS.invokeExact(dnsSettings);
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// 解析结构体为 Java 对象
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return resultv;
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} catch (Throwable e) {
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throw new RuntimeException("Error getting interface DNS settings", e);
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}
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}
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/**
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* 应用 DNS 设置到网卡
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* @param interfaceGuid 网卡的 GUID
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* @param settings DNS 设置对象
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* @return 操作结果 (0 = 成功)
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*/
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public static void setInterfaceDnsSettings(GUID interfaceGuid, DnsInterfaceSettings settings) {
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try (Arena arena = Arena.ofConfined()) {
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// 创建 GUID 内存段
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MemorySegment guidSegment = interfaceGuid.toMemorySegment( arena);
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// 创建 DNS_INTERFACE_SETTINGS 结构体
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MemorySegment dnsSettings = createDnsInterfaceSettingsMemory(settings, arena);
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// 调用 SetInterfaceDnsSettings
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int result= (int) SET_INTERFACE_DNS_SETTINGS.invokeExact(
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guidSegment,
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dnsSettings
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);
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if (result != 0) { // NO_ERROR = 0
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throw new WindowsAPIException("SetInterfaceDnsSettings failed", result);
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}
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} catch (Throwable e) {
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throw new RuntimeException("Error setting interface DNS settings", e);
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}
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}
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/**
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* 解析 DNS_INTERFACE_SETTINGS 结构体为 Java 对象
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*/
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private static DnsInterfaceSettings parseDnsInterfaceSettings(MemorySegment dnsSettings, Arena arena) {
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DnsInterfaceSettings settings = new DnsInterfaceSettings();
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// 读取基本字段
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int version = dnsSettings.get(DWORD, 0);
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settings.setVersion(version);
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long flags = dnsSettings.get(DWORD64, 8);
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settings.setFlags(flags);
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// 读取字符串字段
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MemorySegment domainPtr = dnsSettings.get(POINTER, 16);
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if (!domainPtr.equals(MemorySegment.NULL)) {
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String domain = readWideString(domainPtr, arena);
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settings.setDomain(domain);
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}else {
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settings.setDomain(null);
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}
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// 读取 NameServer (可能是多个服务器，用空格分隔)
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MemorySegment nameServerPtr = dnsSettings.get(POINTER, 24);
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if (!nameServerPtr.equals(MemorySegment.NULL)) {
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String nameServerStr = readWideString(nameServerPtr, arena);
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if (nameServerStr != null && !nameServerStr.isEmpty()) {
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String[] servers = nameServerStr.split("\\s+");
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settings.setNameServers(Arrays.asList(servers));
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}
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}else {
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settings.setNameServers(null);
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}
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// 读取 SearchList (可能是多个域名，用空格分隔)
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MemorySegment searchListPtr = dnsSettings.get(POINTER, 32);
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if (!searchListPtr.equals(MemorySegment.NULL)) {
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String searchListStr = readWideString(searchListPtr, arena);
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if (searchListStr != null && !searchListStr.isEmpty()) {
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String[] domains = searchListStr.split("\\s+");
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settings.setSearchList(Arrays.asList(domains));
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}
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}else {
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settings.setSearchList(null);
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}
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// 读取布尔值字段
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int registrationEnabled = dnsSettings.get(DWORD, 40);
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settings.setRegistrationEnabled(registrationEnabled != 0);
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int registerAdapterName = dnsSettings.get(DWORD, 44);
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settings.setRegisterAdapterName(registerAdapterName != 0);
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int enableLLMNR = dnsSettings.get(DWORD, 48);
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settings.setEnableLLMNR(enableLLMNR != 0);
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int queryAdapterName = dnsSettings.get(DWORD, 52);
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settings.setQueryAdapterName(queryAdapterName != 0);
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// 读取 ProfileNameServer
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MemorySegment profileNameServerPtr = dnsSettings.get(POINTER, 56);
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if (!profileNameServerPtr.equals(MemorySegment.NULL)) {
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String profileNameServer = readWideString(profileNameServerPtr, arena);
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settings.setProfileNameServer(profileNameServer);
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}else {
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settings.setProfileNameServer(null);
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}
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return settings;
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}
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/**
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* 创建 DNS_INTERFACE_SETTINGS 结构体的内存表示
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*/
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private static MemorySegment createDnsInterfaceSettingsMemory(DnsInterfaceSettings settings, Arena arena) {
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// 分配结构体内存
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MemorySegment dnsSettings = arena.allocate(DNS_INTERFACE_SETTINGS_LAYOUT);
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// 设置版本和标志
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dnsSettings.set(DWORD, 0, settings.getVersion());
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dnsSettings.set(DWORD64, 8, settings.getFlags());
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// 设置 Domain
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if (settings.getDomain() != null) {
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MemorySegment domainStr = toWideString(settings.getDomain(), arena);
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dnsSettings.set(POINTER, 16, domainStr);
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} else {
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dnsSettings.set(POINTER, 16, MemorySegment.NULL);
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}
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// 设置 NameServer (多个服务器用空格分隔)
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if (settings.getNameServers()!=null) {
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String nameServerStr = String.join(" ", settings.getNameServers());
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MemorySegment nameServerSegment = toWideString(nameServerStr, arena);
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dnsSettings.set(POINTER, 24, nameServerSegment);
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} else {
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dnsSettings.set(POINTER, 24, MemorySegment.NULL);
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}
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// 设置 SearchList (多个域名用空格分隔)
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if (settings.getSearchList()!=null) {
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String searchListStr = String.join(" ", settings.getSearchList());
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MemorySegment searchListSegment = toWideString(searchListStr, arena);
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dnsSettings.set(POINTER, 32, searchListSegment);
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} else {
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dnsSettings.set(POINTER, 32, MemorySegment.NULL);
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}
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// 设置布尔值字段
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dnsSettings.set(DWORD, 40, settings.isRegistrationEnabled() ? 1 : 0);
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dnsSettings.set(DWORD, 44, settings.isRegisterAdapterName() ? 1 : 0);
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dnsSettings.set(DWORD, 48, settings.isEnableLLMNR() ? 1 : 0);
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dnsSettings.set(DWORD, 52, settings.isQueryAdapterName() ? 1 : 0);
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// 设置 ProfileNameServer
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if (settings.getProfileNameServer() != null ) {
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MemorySegment profileNameServerSegment = toWideString(settings.getProfileNameServer(), arena);
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dnsSettings.set(POINTER, 56, profileNameServerSegment);
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} else {
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dnsSettings.set(POINTER, 56, MemorySegment.NULL);
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}
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return dnsSettings;
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}
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/**
|
||||
* 将 Java String 转换为 Windows 宽字符串 (UTF-16 LE)
|
||||
*/
|
||||
private static MemorySegment toWideString(String str, Arena arena) {
|
||||
if (str == null ) {
|
||||
return MemorySegment.NULL;
|
||||
}
|
||||
|
||||
byte[] utf16Bytes = str.getBytes(java.nio.charset.StandardCharsets.UTF_16LE);
|
||||
MemorySegment segment = arena.allocate(utf16Bytes.length + 2);
|
||||
segment.copyFrom(MemorySegment.ofArray(utf16Bytes));
|
||||
|
||||
// 添加 null 终止符
|
||||
segment.set(ValueLayout.JAVA_BYTE, utf16Bytes.length, (byte) 0);
|
||||
segment.set(ValueLayout.JAVA_BYTE, utf16Bytes.length + 1, (byte) 0);
|
||||
|
||||
return segment;
|
||||
}
|
||||
|
||||
/**
|
||||
* 读取 Windows 宽字符串
|
||||
*/
|
||||
private static String readWideString(MemorySegment strPtr, Arena arena) {
|
||||
if (strPtr.equals(MemorySegment.NULL)) {
|
||||
return null;
|
||||
}
|
||||
strPtr= strPtr.reinterpret(0xffffffffL);
|
||||
//return strPtr.getString(0,Charset.forName("UTF-16"));
|
||||
try {
|
||||
// 计算字符串长度 (找到 null 终止符)
|
||||
long length = 0;
|
||||
while (true) {
|
||||
short ch = strPtr.get(ValueLayout.JAVA_SHORT, length * 2);
|
||||
if (ch == 0) {
|
||||
break;
|
||||
}
|
||||
length++;
|
||||
}
|
||||
|
||||
// 读取字符串数据
|
||||
byte[] bytes = new byte[(int) (length * 2)];
|
||||
MemorySegment.copy(strPtr, 0, MemorySegment.ofArray(bytes), 0, bytes.length);
|
||||
|
||||
return new String(bytes, java.nio.charset.StandardCharsets.UTF_16LE);
|
||||
} catch (Exception e) {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user