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Changed to new ProtocolVersion

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This commit is contained in:
Finn
2026-01-18 18:34:29 +01:00
parent 978d30a82c
commit 63ac0c2d89
7 changed files with 145 additions and 208 deletions
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4
pom.xml
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@@ -6,7 +6,7 @@
<groupId>org.openautonomousconnection</groupId> <groupId>org.openautonomousconnection</groupId>
<artifactId>INSServer</artifactId> <artifactId>INSServer</artifactId>
<version>1.0.0-BETA.1.0</version> <version>1.0.0-BETA.1.1</version>
<organization> <organization>
<name>Open Autonomous Connection</name> <name>Open Autonomous Connection</name>
<url>https://open-autonomous-connection.org/</url> <url>https://open-autonomous-connection.org/</url>
@@ -104,7 +104,7 @@
<dependency> <dependency>
<groupId>org.openautonomousconnection</groupId> <groupId>org.openautonomousconnection</groupId>
<artifactId>Protocol</artifactId> <artifactId>Protocol</artifactId>
<version>1.0.0-BETA.5.2</version> <version>1.0.0-BETA.5.4</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.projectlombok</groupId> <groupId>org.projectlombok</groupId>

78
src/main/java/org/openautonomousconnection/insserver/ClassicHandler.java
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@@ -1,78 +0,0 @@
package org.openautonomousconnection.insserver;
import org.openautonomousconnection.insserver.utils.ClassicHelper;
import org.openautonomousconnection.insserver.utils.ParsedDomain;
import org.openautonomousconnection.protocol.ProtocolBridge;
import org.openautonomousconnection.protocol.side.ins.ConnectedProtocolClient;
import org.openautonomousconnection.protocol.versions.v1_0_0.beta.INSRecord;
import org.openautonomousconnection.protocol.versions.v1_0_0.beta.INSRecordType;
import org.openautonomousconnection.protocol.versions.v1_0_0.classic.handlers.ClassicHandlerINSServer;
import org.openautonomousconnection.protocol.versions.v1_0_0.classic.objects.Classic_Domain;
import org.openautonomousconnection.protocol.versions.v1_0_0.classic.objects.Classic_RequestDomain;
import org.openautonomousconnection.protocol.versions.v1_0_0.classic.utils.Classic_ProtocolVersion;
import java.sql.*;
import java.util.List;
public class ClassicHandler extends ClassicHandlerINSServer {
private ProtocolBridge bridge() {
return Main.getProtocolBridge();
}
@Override
public void handleMessage(ConnectedProtocolClient client, String message, Classic_ProtocolVersion protocolVersion) {
bridge().getLogger().info("[ClassicHandler] Message received from ClientID " + client.getConnectionHandler().getClientID() +
" (Classic Version " + protocolVersion.version + ", Client Version: " +
client.getClientVersion().toString() + "): " + message);
}
@Override
public Classic_Domain getDomain(Classic_RequestDomain requestDomain) throws SQLException {
ParsedDomain pd = ClassicHelper.parseDomain(requestDomain);
// FIRST try A-record
List<INSRecord> a = bridge().getProtocolINSServer().resolve(pd.tln, pd.name, pd.sub, INSRecordType.A);
if (!a.isEmpty()) {
return ClassicHelper.buildClassicDomain(pd, a.get(0));
}
// If no A, try CNAME
List<INSRecord> cnameList = bridge().getProtocolINSServer().resolve(pd.tln, pd.name, pd.sub, INSRecordType.CNAME);
if (cnameList.isEmpty()) return null; // completely not found
INSRecord cname = cnameList.get(0);
// CNAME target = "www.example.net" or "app.dev"
String[] cnameParts = cname.value.split("\\.");
if (cnameParts.length < 2) return null;
String cnameTln = cnameParts[cnameParts.length - 1];
String cnameName = cnameParts[cnameParts.length - 2];
String cnameSub = cnameParts.length > 2
? String.join(".", java.util.Arrays.copyOfRange(cnameParts, 0, cnameParts.length - 2))
: null;
List<INSRecord> aAfterCname = bridge().getProtocolINSServer().resolve(cnameTln, cnameName, cnameSub, INSRecordType.A);
if (aAfterCname.isEmpty()) return null;
return ClassicHelper.buildClassicDomain(pd, aAfterCname.get(0));
}
@Override
public Classic_Domain ping(Classic_RequestDomain req) {
return new Classic_Domain(req.name, req.topLevelDomain, null, req.path, bridge());
}
@Override
public void unsupportedClassicPacket(String className, Object[] content, ConnectedProtocolClient client) {
bridge().getLogger().warn(
"[Classic UnsupportedPacket] From client " + client.getConnectionHandler().getClientID() +
": packet=" + className + " content=" + java.util.Arrays.toString(content)
);
}
}

193
src/main/java/org/openautonomousconnection/insserver/DatabaseINSServer.java
View File

@@ -1,25 +1,30 @@
package org.openautonomousconnection.insserver; package org.openautonomousconnection.insserver;
import dev.unlegitdqrk.unlegitlibrary.file.ConfigurationManager; import dev.unlegitdqrk.unlegitlibrary.file.ConfigurationManager;
import org.openautonomousconnection.insserver.utils.TargetName;
import org.openautonomousconnection.protocol.side.ins.ProtocolINSServer; import org.openautonomousconnection.protocol.side.ins.ProtocolINSServer;
import org.openautonomousconnection.protocol.versions.v1_0_0.beta.INSRecord; import org.openautonomousconnection.protocol.versions.v1_0_0.beta.INSRecord;
import org.openautonomousconnection.protocol.versions.v1_0_0.beta.INSRecordType; import org.openautonomousconnection.protocol.versions.v1_0_0.beta.INSRecordType;
import org.openautonomousconnection.protocol.versions.v1_0_0.classic.helper.TargetName;
import java.io.File; import java.io.File;
import java.io.IOException; import java.io.IOException;
import java.security.cert.CertificateException; import java.security.cert.CertificateException;
import java.sql.*; import java.sql.*;
import java.util.ArrayList; import java.util.*;
import java.util.List;
/**
* Database-backed INS server.
* <p>
* This implementation resolves records from the SQL schema and performs CNAME recursion (with loop detection + depth limit).
* Returned records are deterministically sorted so that callers can safely select index 0 as the "best" record.
*/
public final class DatabaseINSServer extends ProtocolINSServer { public final class DatabaseINSServer extends ProtocolINSServer {
private final String jdbcUrl; private final String jdbcUrl;
private final String jdbcUser; private final String jdbcUser;
private final String jdbcPassword; private final String jdbcPassword;
private final ConfigurationManager configurationManager; private final ConfigurationManager config;
/** /**
* Creates a new database-backed INS server. * Creates a new database-backed INS server.
@@ -27,38 +32,40 @@ public final class DatabaseINSServer extends ProtocolINSServer {
* @throws IOException If the base server initialization fails. * @throws IOException If the base server initialization fails.
* @throws CertificateException If required certificate files are missing or invalid. * @throws CertificateException If required certificate files are missing or invalid.
*/ */
public DatabaseINSServer() throws IOException, CertificateException { public DatabaseINSServer() throws Exception {
super(new File("config.properties")); super(new File("config.properties"));
configurationManager = new ConfigurationManager(new File("config.properties")); config = new ConfigurationManager(new File("config.properties"));
configurationManager.loadProperties(); config.loadProperties();
if (!configurationManager.isSet("db.url")) { if (!config.isSet("db.url")) {
configurationManager.set( config.set(
"db.url", "db.url",
"jdbc:mysql://localhost:3306/ins?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC" "jdbc:mysql://localhost:3306/ins?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC"
); );
configurationManager.saveProperties(); config.saveProperties();
} }
if (!configurationManager.isSet("db.user")) { if (!config.isSet("db.user")) {
configurationManager.set("db.user", "username"); config.set("db.user", "username");
configurationManager.saveProperties(); config.saveProperties();
} }
if (!configurationManager.isSet("db.password")) { if (!config.isSet("db.password")) {
configurationManager.set("db.password", "password"); config.set("db.password", "password");
configurationManager.saveProperties(); config.saveProperties();
} }
if (!configurationManager.isSet("port")) { if (!config.isSet("port")) {
configurationManager.set("port", 1023); config.set("port", 1023);
configurationManager.saveProperties(); config.saveProperties();
} }
jdbcUrl = configurationManager.getString("db.url"); jdbcUrl = config.getString("db.url");
jdbcUser = configurationManager.getString("db.user"); jdbcUser = config.getString("db.user");
jdbcPassword = configurationManager.getString("db.password"); jdbcPassword = config.getString("db.password");
Main.getSettings().port = config.getInt("port");
} }
private Connection openConnection() throws SQLException { private Connection openConnection() throws SQLException {
@@ -68,30 +75,42 @@ public final class DatabaseINSServer extends ProtocolINSServer {
/** /**
* Resolves a request for an INS record based on TLN, name, subname and record type. * Resolves a request for an INS record based on TLN, name, subname and record type.
* <p> * <p>
* This implementation: * The implementation:
* <ul> * <ul>
* <li>Locates the corresponding InfoName in the SQL schema</li> * <li>Locates the corresponding InfoName in the SQL schema</li>
* <li>Returns all matching {@link INSRecord} entries</li> * <li>Returns all matching {@link INSRecord} entries</li>
* <li>Performs CNAME recursion (with a depth limit) when no direct * <li>Performs CNAME recursion (with loop detection + depth limit) when no direct records for the requested type exist</li>
* records for the requested type exist</li> * <li>Returns deterministically sorted results (so index 0 can be used as "best record")</li>
* </ul> * </ul>
*
* @param tln The top-level name.
* @param name The InfoName.
* @param sub Optional subname, may be {@code null}.
* @param type The requested record type.
* @return Resolved records (possibly empty).
*/ */
@Override @Override
public List<INSRecord> resolve(String tln, String name, String sub, INSRecordType type) { public List<INSRecord> resolve(String tln, String name, String sub, INSRecordType type) {
try { try {
return resolveInternal(tln, name, sub, type, 0); List<INSRecord> out = resolveInternal(tln, name, sub, type, 0, new HashSet<>());
out.sort(recordComparator(type));
return out;
} catch (SQLException ex) { } catch (SQLException ex) {
getProtocolBridge().getLogger().exception("INS resolve failed for " + formatName(tln, name, sub) + " type=" + type, ex); getProtocolBridge().getLogger().exception(
"INS resolve failed for " + formatName(tln, name, sub) + " type=" + type,
ex
);
return new ArrayList<>(); return new ArrayList<>();
} }
} }
/** /**
* Resolves the TLN info site, * Resolves the TLN info site which is used when a client queries {@code info.<tln>} without any sub-name.
* which is used when a client queries {@code info.<tln>} without any sub-name.
* <p> * <p>
* The value is read from {@code tln.info} and must be of the form * The value is read from {@code tln.info} and must be of the form {@code "host:port"}.
* {@code "host:port"}. *
* @param tln The TLN name.
* @return The configured info target ("host:port") or {@code null} if not present.
*/ */
@Override @Override
public String resolveTLNInfoSite(String tln) { public String resolveTLNInfoSite(String tln) {
@@ -103,7 +122,7 @@ public final class DatabaseINSServer extends ProtocolINSServer {
ps.setString(1, tln); ps.setString(1, tln);
try (ResultSet rs = ps.executeQuery()) { try (ResultSet rs = ps.executeQuery()) {
if (rs.next()) return rs.getString("info"); // expected "host:port" if (rs.next()) return rs.getString("info");
} }
} catch (SQLException ex) { } catch (SQLException ex) {
getProtocolBridge().getLogger().exception("Failed to resolve TLN info site for tln=" + tln, ex); getProtocolBridge().getLogger().exception("Failed to resolve TLN info site for tln=" + tln, ex);
@@ -118,18 +137,35 @@ public final class DatabaseINSServer extends ProtocolINSServer {
} }
/** /**
* Recursive resolver with CNAME handling and depth limit. * Internal recursive resolver with CNAME handling.
*
* @param depth Current recursion depth.
* @param visited Loop detection set of canonical names (sub.name.tln).
*/ */
private List<INSRecord> resolveInternal(String tln, String name, String sub, INSRecordType requestedType, int depth) throws SQLException { private List<INSRecord> resolveInternal(
final int MAX_CNAME_DEPTH = 8; String tln,
String name,
String sub,
INSRecordType requestedType,
int depth,
Set<String> visited
) throws SQLException {
final int MAX_CNAME_DEPTH = 16;
String canonical = formatName(tln, name, sub).toLowerCase(Locale.ROOT);
if (!visited.add(canonical)) {
// loop detected
getProtocolBridge().getLogger().warn("CNAME loop detected for " + canonical + " type=" + requestedType);
return new ArrayList<>();
}
if (depth > MAX_CNAME_DEPTH) { if (depth > MAX_CNAME_DEPTH) {
getProtocolBridge().getLogger().warn("CNAME recursion limit exceeded for " + formatName(tln, name, sub) + " type=" + requestedType); getProtocolBridge().getLogger().warn("CNAME recursion limit exceeded for " + canonical + " type=" + requestedType);
return new ArrayList<>(); return new ArrayList<>();
} }
try (Connection conn = openConnection()) { try (Connection conn = openConnection()) {
// Get IDs
Integer tlnId = findTLNId(conn, tln); Integer tlnId = findTLNId(conn, tln);
if (tlnId == null) return new ArrayList<>(); if (tlnId == null) return new ArrayList<>();
@@ -138,43 +174,93 @@ public final class DatabaseINSServer extends ProtocolINSServer {
Integer subNameId = findSubNameId(conn, infoNameId, sub); Integer subNameId = findSubNameId(conn, infoNameId, sub);
// Get records // 1) direct records
List<INSRecord> direct = loadRecords(conn, infoNameId, subNameId, requestedType); List<INSRecord> direct = loadRecords(conn, infoNameId, subNameId, requestedType);
direct.sort(recordComparator(requestedType));
// No more recursion when CNAME received // If the requested type is CNAME, do not recurse.
if (requestedType == INSRecordType.CNAME) return direct; if (requestedType == INSRecordType.CNAME) return direct;
if (!direct.isEmpty()) return direct; if (!direct.isEmpty()) return direct;
// CNAME lookup // 2) fallback to CNAME if no direct records exist
List<INSRecord> cnames = loadRecords(conn, infoNameId, subNameId, INSRecordType.CNAME); List<INSRecord> cnames = loadRecords(conn, infoNameId, subNameId, INSRecordType.CNAME);
if (cnames.isEmpty()) return direct; // empty cnames.sort(recordComparator(INSRecordType.CNAME));
if (cnames.isEmpty()) return new ArrayList<>();
List<INSRecord> aggregated = new ArrayList<>(); List<INSRecord> aggregated = new ArrayList<>();
for (INSRecord cname : cnames) { for (INSRecord cname : cnames) {
TargetName target = parseCnameTarget(cname.value); TargetName target = parseCnameTarget(cname.value);
if (target == null) { if (target == null) {
getProtocolBridge().getLogger().warn("Invalid CNAME target '" + cname.value + "' on " + formatName(tln, name, sub)); getProtocolBridge().getLogger().warn("Invalid CNAME target '" + cname.value + "' on " + canonical);
continue; continue;
} }
// Rekursiv den Zielnamen auflösen // recurse on the target name to fetch the original requested type
aggregated.addAll(resolveInternal(target.tln, target.name, target.sub, requestedType, depth + 1)); List<INSRecord> resolvedTarget = resolveInternal(
target.tln(),
target.name(),
target.sub(),
requestedType,
depth + 1,
visited
);
aggregated.addAll(resolvedTarget);
} }
aggregated.sort(recordComparator(requestedType));
return aggregated; return aggregated;
} finally {
// important: visited is shared across the recursion chain on purpose
// (do not remove canonical here; loop detection should stay for the whole chain)
} }
} }
/**
* Deterministic ordering for returned records. The goal is stable ranking so callers can pick index 0.
*
* <p>Rules:
* <ul>
* <li>priority ASC (smaller is better)</li>
* <li>weight DESC (larger is better)</li>
* <li>port ASC (smaller is better)</li>
* <li>ttl DESC (larger is better)</li>
* <li>value ASC (case-insensitive) as final tie-breaker</li>
* </ul>
*
* @param requestedType The type being requested (kept for future type-specific tuning).
* @return Comparator for {@link INSRecord}.
*/
private Comparator<INSRecord> recordComparator(INSRecordType requestedType) {
return Comparator
.comparingInt((INSRecord r) -> safeInt(r.priority))
.thenComparingInt(r -> -safeInt(r.weight))
.thenComparingInt(r -> safeInt(r.port))
.thenComparingInt(r -> -safeInt(r.ttl))
.thenComparing(r -> safeString(r.value), String.CASE_INSENSITIVE_ORDER);
}
private static int safeInt(int v) {
return v;
}
private static String safeString(String s) {
return s == null ? "" : s;
}
/** /**
* Loads all records of a given type for (infoname_id, subname_id). * Loads all records of a given type for (infoname_id, subname_id).
* *
* @param type May be {@code null} to load all types. * @param type May be {@code null} to load all types.
*/ */
private List<INSRecord> loadRecords(Connection conn, int infonameId, Integer subnameId, INSRecordType type) throws SQLException { private List<INSRecord> loadRecords(Connection conn, int infonameId, Integer subnameId, INSRecordType type) throws SQLException {
StringBuilder sql = new StringBuilder(
StringBuilder sql = new StringBuilder("SELECT type, value, ttl, priority, port, weight FROM records WHERE infoname_id = ? "); "SELECT type, value, ttl, priority, port, weight " +
"FROM records " +
"WHERE infoname_id = ? "
);
if (subnameId == null) sql.append("AND subname_id IS NULL "); if (subnameId == null) sql.append("AND subname_id IS NULL ");
else sql.append("AND subname_id = ? "); else sql.append("AND subname_id = ? ");
@@ -213,7 +299,6 @@ public final class DatabaseINSServer extends ProtocolINSServer {
try (PreparedStatement ps = conn.prepareStatement(sql)) { try (PreparedStatement ps = conn.prepareStatement(sql)) {
ps.setString(1, tln); ps.setString(1, tln);
try (ResultSet rs = ps.executeQuery()) { try (ResultSet rs = ps.executeQuery()) {
if (rs.next()) return rs.getInt("id"); if (rs.next()) return rs.getInt("id");
} }
@@ -227,12 +312,10 @@ public final class DatabaseINSServer extends ProtocolINSServer {
try (PreparedStatement ps = conn.prepareStatement(sql)) { try (PreparedStatement ps = conn.prepareStatement(sql)) {
ps.setInt(1, tlnId); ps.setInt(1, tlnId);
ps.setString(2, infoName); ps.setString(2, infoName);
try (ResultSet rs = ps.executeQuery()) { try (ResultSet rs = ps.executeQuery()) {
if (rs.next()) return rs.getInt("id"); if (rs.next()) return rs.getInt("id");
} }
} }
return null; return null;
} }
@@ -248,16 +331,14 @@ public final class DatabaseINSServer extends ProtocolINSServer {
if (rs.next()) return rs.getInt("id"); if (rs.next()) return rs.getInt("id");
} }
} }
return null; return null;
} }
/** /**
* Parses a CNAME target string into TLN, InfoName and optional subname. * Parses a CNAME target string into TLN, InfoName and optional subname.
* <p>
* *
* @param value Raw CNAME value from the {@code records} table. * @param value Raw CNAME value (e.g. "sub.app.example" or "example.net").
* @return Parsed {@link TargetName} or {@code null} if the value is invalid. * @return Parsed {@link TargetName} or {@code null} if invalid.
*/ */
private TargetName parseCnameTarget(String value) { private TargetName parseCnameTarget(String value) {
if (value == null) return null; if (value == null) return null;
@@ -265,7 +346,7 @@ public final class DatabaseINSServer extends ProtocolINSServer {
if (trimmed.isEmpty()) return null; if (trimmed.isEmpty()) return null;
String[] parts = trimmed.split("\\."); String[] parts = trimmed.split("\\.");
if (parts.length < 2) return null; // at least "<name>.<tln>" if (parts.length < 2) return null;
String tln = parts[parts.length - 1]; String tln = parts[parts.length - 1];
String name = parts[parts.length - 2]; String name = parts[parts.length - 2];
@@ -273,12 +354,10 @@ public final class DatabaseINSServer extends ProtocolINSServer {
if (parts.length > 2) { if (parts.length > 2) {
StringBuilder sb = new StringBuilder(); StringBuilder sb = new StringBuilder();
for (int i = 0; i < parts.length - 2; i++) { for (int i = 0; i < parts.length - 2; i++) {
if (i > 0) sb.append('.'); if (i > 0) sb.append('.');
sb.append(parts[i]); sb.append(parts[i]);
} }
sub = sb.toString(); sub = sb.toString();
} }

7
src/main/java/org/openautonomousconnection/insserver/Main.java
View File

@@ -9,6 +9,7 @@ import lombok.Getter;
import org.openautonomousconnection.protocol.ProtocolBridge; import org.openautonomousconnection.protocol.ProtocolBridge;
import org.openautonomousconnection.protocol.ProtocolSettings; import org.openautonomousconnection.protocol.ProtocolSettings;
import org.openautonomousconnection.protocol.versions.ProtocolVersion; import org.openautonomousconnection.protocol.versions.ProtocolVersion;
import org.openautonomousconnection.protocol.versions.v1_0_0.classic.handlers.builtin.INSClassic;
import java.io.File; import java.io.File;
import java.util.Scanner; import java.util.Scanner;
@@ -31,7 +32,11 @@ public class Main {
settings.eventManager.registerListener(Listener.class); settings.eventManager.registerListener(Listener.class);
settings.port = 1023; settings.port = 1023;
protocolBridge = new ProtocolBridge(new DatabaseINSServer(), settings, ProtocolVersion.PV_1_0_0_BETA, new File("logs")); DatabaseINSServer server = new DatabaseINSServer();
protocolBridge = new ProtocolBridge(server, settings, ProtocolVersion.PV_1_0_0_BETA, new File("logs"));
protocolBridge.setClassicHandlerINSServer(new INSClassic(protocolBridge));
server.getPipelineServer().start();
commandManager = new CommandManager(protocolBridge.getProtocolSettings().eventManager); commandManager = new CommandManager(protocolBridge.getProtocolSettings().eventManager);
Scanner scanner = new Scanner(System.in); Scanner scanner = new Scanner(System.in);

38
src/main/java/org/openautonomousconnection/insserver/utils/ClassicHelper.java
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@@ -1,38 +0,0 @@
package org.openautonomousconnection.insserver.utils;
import org.openautonomousconnection.insserver.Main;
import org.openautonomousconnection.protocol.versions.v1_0_0.beta.INSRecord;
import org.openautonomousconnection.protocol.versions.v1_0_0.classic.objects.Classic_Domain;
import org.openautonomousconnection.protocol.versions.v1_0_0.classic.objects.Classic_RequestDomain;
public class ClassicHelper {
public static Classic_Domain buildClassicDomain(ParsedDomain req, INSRecord rec) {
Classic_Domain info = new Classic_Domain(req.name, req.tln, req.sub, req.path, Main.getProtocolBridge());
String host = rec.value;
int port = rec.port > 0 ? rec.port : 80;
return new Classic_Domain(
req.name, req.tln,
host.contains(":") ? host : host + ":" + port,
req.path, Main.getProtocolBridge());
}
public static ParsedDomain parseDomain(Classic_RequestDomain req) {
String tln = req.topLevelDomain; // example: "net"
String full = req.name; // example: "api.v1.example"
String[] parts = full.split("\\.");
if (parts.length == 1) {
return new ParsedDomain(tln, full, null, req.path);
}
String name = parts[parts.length - 1];
String sub = parts.length > 1
? String.join(".", java.util.Arrays.copyOfRange(parts, 0, parts.length - 1))
: null;
return new ParsedDomain(tln, name, sub, req.path);
}
}

15
src/main/java/org/openautonomousconnection/insserver/utils/ParsedDomain.java
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@@ -1,15 +0,0 @@
package org.openautonomousconnection.insserver.utils;
public final class ParsedDomain {
public final String tln;
public final String name;
public final String sub;
public final String path;
public ParsedDomain(String tln, String name, String sub, String path) {
this.tln = tln;
this.name = name;
this.sub = sub;
this.path = path;
}
}

16
src/main/java/org/openautonomousconnection/insserver/utils/TargetName.java
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@@ -1,16 +0,0 @@
package org.openautonomousconnection.insserver.utils;
/**
* Represents a parsed CNAME target in (tln, name, sub) form.
*/
public final class TargetName {
public final String tln;
public final String name;
public final String sub;
public TargetName(String tln, String name, String sub) {
this.tln = tln;
this.name = name;
this.sub = sub;
}
}