3.41.8

changelog.md

@@ -1,5 +1,21 @@
 # Changelog
 
+## 2025-03-12 - 3.41.8 - fix(portproxy)
+Improve TLS handshake timeout handling and connection piping in PortProxy
+
+- Increase the default initial handshake timeout from 60 seconds to 120 seconds
+- Add a 30-second grace period before terminating connections waiting for initial TLS data
+- Refactor piping logic by removing redundant callback and establishing piping immediately after flushing buffered data
+- Enhance debug logging during TLS ClientHello processing for improved SNI extraction insights
+
+## 2025-03-12 - 3.41.7 - fix(core)
+Refactor PortProxy and SniHandler: improve configuration handling, logging, and whitespace consistency
+
+- Standardized indentation and spacing for configuration properties in PortProxy settings (e.g. ACME options, keepAliveProbes, allowSessionTicket)
+- Simplified conditional formatting and improved inline comments in PortProxy
+- Enhanced logging messages in SniHandler for TLS handshake and session resumption detection
+- Improved debugging output (e.g. hexdump of initial TLS packet) and consistency of multi-line expressions
+
 ## 2025-03-12 - 3.41.6 - fix(SniHandler)
 Refactor SniHandler: update whitespace, comment formatting, and consistent type definitions
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@push.rocks/smartproxy",
-  "version": "3.41.6",
+  "version": "3.41.8",
   "private": false,
   "description": "A powerful proxy package that effectively handles high traffic, with features such as SSL/TLS support, port proxying, WebSocket handling, dynamic routing with authentication options, and automatic ACME certificate management.",
   "main": "dist_ts/index.js",

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartproxy',
-  version: '3.41.6',
+  version: '3.41.8',
   description: 'A powerful proxy package that effectively handles high traffic, with features such as SSL/TLS support, port proxying, WebSocket handling, dynamic routing with authentication options, and automatic ACME certificate management.'
 }

ts/classes.portproxy.ts

@@ -216,7 +216,7 @@ export class PortProxy {
       targetIP: settingsArg.targetIP || 'localhost',
 
       // Timeout settings with reasonable defaults
-      initialDataTimeout: settingsArg.initialDataTimeout || 60000, // 60 seconds for initial handshake
+      initialDataTimeout: settingsArg.initialDataTimeout || 120000, // 120 seconds for initial handshake
       socketTimeout: ensureSafeTimeout(settingsArg.socketTimeout || 3600000), // 1 hour socket timeout
       inactivityCheckInterval: settingsArg.inactivityCheckInterval || 60000, // 60 seconds interval
       maxConnectionLifetime: ensureSafeTimeout(settingsArg.maxConnectionLifetime || 86400000), // 24 hours default
@@ -232,13 +232,13 @@ export class PortProxy {
 
       // Feature flags
       disableInactivityCheck: settingsArg.disableInactivityCheck || false,
-      enableKeepAliveProbes: settingsArg.enableKeepAliveProbes !== undefined 
-                            ? settingsArg.enableKeepAliveProbes : true,
+      enableKeepAliveProbes:
+        settingsArg.enableKeepAliveProbes !== undefined ? settingsArg.enableKeepAliveProbes : true,
       enableDetailedLogging: settingsArg.enableDetailedLogging || false,
       enableTlsDebugLogging: settingsArg.enableTlsDebugLogging || false,
       enableRandomizedTimeouts: settingsArg.enableRandomizedTimeouts || false,
-      allowSessionTicket: settingsArg.allowSessionTicket !== undefined 
-                         ? settingsArg.allowSessionTicket : true,
+      allowSessionTicket:
+        settingsArg.allowSessionTicket !== undefined ? settingsArg.allowSessionTicket : true,
 
       // Rate limiting defaults
       maxConnectionsPerIP: settingsArg.maxConnectionsPerIP || 100,
@@ -261,8 +261,8 @@ export class PortProxy {
         renewThresholdDays: 30,
         autoRenew: true,
         certificateStore: './certs',
-        skipConfiguredCerts: false
-      }
+        skipConfiguredCerts: false,
+      },
     };
 
     // Initialize NetworkProxy if enabled
@@ -280,7 +280,7 @@ export class PortProxy {
       const networkProxyOptions: any = {
         port: this.settings.networkProxyPort!,
         portProxyIntegration: true,
-        logLevel: this.settings.enableDetailedLogging ? 'debug' : 'info'
+        logLevel: this.settings.enableDetailedLogging ? 'debug' : 'info',
       };
 
       // Add ACME settings if configured
@@ -321,7 +321,7 @@ export class PortProxy {
     // Update settings
     this.settings.acme = {
       ...this.settings.acme,
-      ...acmeSettings
+      ...acmeSettings,
     };
 
     // If NetworkProxy is initialized, update its ACME settings
@@ -379,17 +379,19 @@ export class PortProxy {
       try {
         certPair = {
           key: fs.readFileSync('assets/certs/key.pem', 'utf8'),
-          cert: fs.readFileSync('assets/certs/cert.pem', 'utf8')
+          cert: fs.readFileSync('assets/certs/cert.pem', 'utf8'),
         };
       } catch (certError) {
         console.log(`Warning: Could not read default certificates: ${certError}`);
-        console.log('Using empty certificate placeholders - ACME will generate proper certificates if enabled');
+        console.log(
+          'Using empty certificate placeholders - ACME will generate proper certificates if enabled'
+        );
 
         // Use empty placeholders - NetworkProxy will use its internal defaults
         // or ACME will generate proper ones if enabled
         certPair = {
           key: '',
-          cert: ''
+          cert: '',
         };
       }
 
@@ -402,8 +404,8 @@ export class PortProxy {
       // Log ACME-eligible domains if ACME is enabled
       if (this.settings.acme?.enabled) {
         const acmeEligibleDomains = proxyConfigs
-          .filter(config => !config.hostName.includes('*')) // Exclude wildcards
-          .map(config => config.hostName);
+          .filter((config) => !config.hostName.includes('*')) // Exclude wildcards
+          .map((config) => config.hostName);
 
         if (acmeEligibleDomains.length > 0) {
           console.log(`Domains eligible for ACME certificates: ${acmeEligibleDomains.join(', ')}`);
@@ -413,9 +415,14 @@ export class PortProxy {
       }
 
       // Update NetworkProxy with the converted configs
-      this.networkProxy.updateProxyConfigs(proxyConfigs).then(() => {
-        console.log(`Successfully synchronized ${proxyConfigs.length} domain configurations to NetworkProxy`);
-      }).catch(err => {
+      this.networkProxy
+        .updateProxyConfigs(proxyConfigs)
+        .then(() => {
+          console.log(
+            `Successfully synchronized ${proxyConfigs.length} domain configurations to NetworkProxy`
+          );
+        })
+        .catch((err) => {
           console.log(`Error synchronizing configurations: ${err.message}`);
         });
     } catch (err) {
@@ -546,9 +553,7 @@ export class PortProxy {
       proxySocket.on('data', () => this.updateActivity(record));
 
       if (this.settings.enableDetailedLogging) {
-        console.log(
-          `[${connectionId}] TLS connection successfully forwarded to NetworkProxy`
-        );
+        console.log(`[${connectionId}] TLS connection successfully forwarded to NetworkProxy`);
       }
     });
   }
@@ -849,16 +854,35 @@ export class PortProxy {
       // Process any remaining data in the queue before switching to piping
       processDataQueue();
       
-      // Setup function to establish piping - we'll use this after flushing data
-      const setupPiping = () => {
-        // Mark that we're switching to piping mode
+      // Set up piping immediately - don't delay this crucial step
       pipingEstablished = true;
       
-        // Setup piping in both directions
+      // Flush all pending data to target
+      if (record.pendingData.length > 0) {
+        const combinedData = Buffer.concat(record.pendingData);
+        
+        if (this.settings.enableDetailedLogging) {
+          console.log(`[${connectionId}] Forwarding ${combinedData.length} bytes of initial data to target`);
+        }
+        
+        // Write pending data immediately
+        targetSocket.write(combinedData, (err) => {
+          if (err) {
+            console.log(`[${connectionId}] Error writing pending data to target: ${err.message}`);
+            return this.initiateCleanupOnce(record, 'write_error');
+          }
+        });
+        
+        // Clear the buffer now that we've processed it
+        record.pendingData = [];
+        record.pendingDataSize = 0;
+      }
+      
+      // Setup piping in both directions without any delays
       socket.pipe(targetSocket);
       targetSocket.pipe(socket);
       
-        // Resume the socket to ensure data flows
+      // Resume the socket to ensure data flows - CRITICAL!
       socket.resume();
       
       // Process any data that might be queued in the interim
@@ -898,28 +922,7 @@ export class PortProxy {
             }`
         );
       }
-      };
 
-      // Flush all pending data to target
-      if (record.pendingData.length > 0) {
-        const combinedData = Buffer.concat(record.pendingData);
-        targetSocket.write(combinedData, (err) => {
-          if (err) {
-            console.log(`[${connectionId}] Error writing pending data to target: ${err.message}`);
-            return this.initiateCleanupOnce(record, 'write_error');
-          }
-
-          // Establish piping now that we've flushed the buffered data
-          setupPiping();
-        });
-      } else {
-        // No pending data, just establish piping immediately
-        setupPiping();
-      }
-
-      // Clear the buffer now that we've processed it
-      record.pendingData = [];
-      record.pendingDataSize = 0;
 
       // Add the renegotiation handler for SNI validation with strict domain enforcement
       // This will be called after we've established piping
@@ -935,18 +938,24 @@ export class PortProxy {
                 sourceIp: record.remoteIP,
                 sourcePort: record.incoming.remotePort || 0,
                 destIp: record.incoming.localAddress || '',
-                destPort: record.incoming.localPort || 0
+                destPort: record.incoming.localPort || 0,
               };
 
               // Check for session tickets if allowSessionTicket is disabled
               if (this.settings.allowSessionTicket === false) {
                 // Analyze for session resumption attempt (session ticket or PSK)
-                const resumptionInfo = SniHandler.hasSessionResumption(renegChunk, this.settings.enableTlsDebugLogging);
+                const resumptionInfo = SniHandler.hasSessionResumption(
+                  renegChunk,
+                  this.settings.enableTlsDebugLogging
+                );
 
                 if (resumptionInfo.isResumption) {
                   // Always log resumption attempt for easier debugging
                   // Try to extract SNI for logging
-                  const extractedSNI = SniHandler.extractSNI(renegChunk, this.settings.enableTlsDebugLogging);
+                  const extractedSNI = SniHandler.extractSNI(
+                    renegChunk,
+                    this.settings.enableTlsDebugLogging
+                  );
                   console.log(
                     `[${connectionId}] Session resumption detected in renegotiation. ` +
                       `Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, ` +
@@ -973,7 +982,11 @@ export class PortProxy {
                 }
               }
 
-              const newSNI = SniHandler.extractSNIWithResumptionSupport(renegChunk, connInfo, this.settings.enableTlsDebugLogging);
+              const newSNI = SniHandler.extractSNIWithResumptionSupport(
+                renegChunk,
+                connInfo,
+                this.settings.enableTlsDebugLogging
+              );
 
               // Skip if no SNI was found
               if (!newSNI) return;
@@ -1007,9 +1020,13 @@ export class PortProxy {
         socket.on('data', renegotiationHandler);
 
         if (this.settings.enableDetailedLogging) {
-          console.log(`[${connectionId}] TLS renegotiation handler installed for SNI domain: ${serverName}`);
+          console.log(
+            `[${connectionId}] TLS renegotiation handler installed for SNI domain: ${serverName}`
+          );
           if (this.settings.allowSessionTicket === false) {
-            console.log(`[${connectionId}] Session ticket usage is disabled. Connection will be reset on reconnection attempts.`);
+            console.log(
+              `[${connectionId}] Session ticket usage is disabled. Connection will be reset on reconnection attempts.`
+            );
           }
         }
       }
@@ -1402,7 +1419,11 @@ export class PortProxy {
     }
 
     // Initialize NetworkProxy if needed (useNetworkProxy is set but networkProxy isn't initialized)
-    if (this.settings.useNetworkProxy && this.settings.useNetworkProxy.length > 0 && !this.networkProxy) {
+    if (
+      this.settings.useNetworkProxy &&
+      this.settings.useNetworkProxy.length > 0 &&
+      !this.networkProxy
+    ) {
       await this.initializeNetworkProxy();
     }
 
@@ -1413,7 +1434,11 @@ export class PortProxy {
 
       // Log ACME status
       if (this.settings.acme?.enabled) {
-        console.log(`ACME certificate management is enabled (${this.settings.acme.useProduction ? 'Production' : 'Staging'} mode)`);
+        console.log(
+          `ACME certificate management is enabled (${
+            this.settings.acme.useProduction ? 'Production' : 'Staging'
+          } mode)`
+        );
         console.log(`ACME HTTP challenge server on port ${this.settings.acme.port}`);
 
         // Register domains for ACME certificates if enabled
@@ -1536,8 +1561,8 @@ export class PortProxy {
 
       // Check if this connection should be forwarded directly to NetworkProxy
       // First check port-based forwarding settings
-      let shouldUseNetworkProxy = this.settings.useNetworkProxy && 
-                                 this.settings.useNetworkProxy.includes(localPort);
+      let shouldUseNetworkProxy =
+        this.settings.useNetworkProxy && this.settings.useNetworkProxy.includes(localPort);
 
       // We'll look for domain-specific settings after SNI extraction
 
@@ -1548,9 +1573,12 @@ export class PortProxy {
         // Set an initial timeout for handshake data
         let initialTimeout: NodeJS.Timeout | null = setTimeout(() => {
           if (!initialDataReceived) {
-            console.log(
-              `[${connectionId}] Initial data timeout (${this.settings.initialDataTimeout}ms) for connection from ${remoteIP} on port ${localPort}`
-            );
+            console.log(`[${connectionId}] Initial data warning (${this.settings.initialDataTimeout}ms) for connection from ${remoteIP}`);
+            
+            // Add a grace period instead of immediate termination
+            setTimeout(() => {
+              if (!initialDataReceived) {
+                console.log(`[${connectionId}] Final initial data timeout after grace period`);
                 if (connectionRecord.incomingTerminationReason === null) {
                   connectionRecord.incomingTerminationReason = 'initial_timeout';
                   this.incrementTerminationStat('incoming', 'initial_timeout');
@@ -1558,6 +1586,8 @@ export class PortProxy {
                 socket.end();
                 this.cleanupConnection(connectionRecord, 'initial_timeout');
               }
+            }, 30000); // 30 second grace period
+          }
         }, this.settings.initialDataTimeout!);
 
         // Make sure timeout doesn't keep the process alive
@@ -1601,11 +1631,17 @@ export class PortProxy {
             // Check for TLS ClientHello with either no SNI or session tickets
             if (this.settings.allowSessionTicket === false && SniHandler.isClientHello(chunk)) {
               // Extract SNI first
-              const extractedSNI = SniHandler.extractSNI(chunk, this.settings.enableTlsDebugLogging);
+              const extractedSNI = SniHandler.extractSNI(
+                chunk,
+                this.settings.enableTlsDebugLogging
+              );
               const hasSNI = !!extractedSNI;
 
               // Analyze for session resumption attempt
-              const resumptionInfo = SniHandler.hasSessionResumption(chunk, this.settings.enableTlsDebugLogging);
+              const resumptionInfo = SniHandler.hasSessionResumption(
+                chunk,
+                this.settings.enableTlsDebugLogging
+              );
 
               // Always log for debugging purposes
               console.log(
@@ -1652,7 +1688,7 @@ export class PortProxy {
               sourceIp: remoteIP,
               sourcePort: socket.remotePort || 0,
               destIp: socket.localAddress || '',
-              destPort: socket.localPort || 0
+              destPort: socket.localPort || 0,
             };
 
             // Extract SNI to check for domain-specific NetworkProxy settings
@@ -1674,7 +1710,8 @@ export class PortProxy {
 
               // Use domain-specific NetworkProxy port if configured
               if (domainConfig?.useNetworkProxy) {
-                const networkProxyPort = domainConfig.networkProxyPort || this.settings.networkProxyPort;
+                const networkProxyPort =
+                  domainConfig.networkProxyPort || this.settings.networkProxyPort;
 
                 if (this.settings.enableDetailedLogging) {
                   console.log(
@@ -1683,7 +1720,13 @@ export class PortProxy {
                 }
 
                 // Forward to NetworkProxy with domain-specific port
-                this.forwardToNetworkProxy(connectionId, socket, connectionRecord, chunk, networkProxyPort);
+                this.forwardToNetworkProxy(
+                  connectionId,
+                  socket,
+                  connectionRecord,
+                  chunk,
+                  networkProxyPort
+                );
                 return;
               }
             }
@@ -1693,10 +1736,16 @@ export class PortProxy {
           } else {
             // If not TLS, use normal direct connection
             console.log(`[${connectionId}] Non-TLS connection on NetworkProxy port ${localPort}`);
-            this.setupDirectConnection(connectionId, socket, connectionRecord, undefined, undefined, chunk);
+            this.setupDirectConnection(
+              connectionId,
+              socket,
+              connectionRecord,
+              undefined,
+              undefined,
+              chunk
+            );
           }
         });
-        
       } else {
         // For non-NetworkProxy ports, proceed with normal processing
 
@@ -1718,9 +1767,12 @@ export class PortProxy {
         if (this.settings.sniEnabled) {
           initialTimeout = setTimeout(() => {
             if (!initialDataReceived) {
-              console.log(
-                `[${connectionId}] Initial data timeout (${this.settings.initialDataTimeout}ms) for connection from ${remoteIP} on port ${localPort}`
-              );
+              console.log(`[${connectionId}] Initial data warning (${this.settings.initialDataTimeout}ms) for connection from ${remoteIP}`);
+              
+              // Add a grace period instead of immediate termination
+              setTimeout(() => {
+                if (!initialDataReceived) {
+                  console.log(`[${connectionId}] Final initial data timeout after grace period`);
                   if (connectionRecord.incomingTerminationReason === null) {
                     connectionRecord.incomingTerminationReason = 'initial_timeout';
                     this.incrementTerminationStat('incoming', 'initial_timeout');
@@ -1728,6 +1780,8 @@ export class PortProxy {
                   socket.end();
                   this.cleanupConnection(connectionRecord, 'initial_timeout');
                 }
+              }, 30000); // 30 second grace period
+            }
           }, this.settings.initialDataTimeout!);
 
           // Make sure timeout doesn't keep the process alive
@@ -1760,7 +1814,7 @@ export class PortProxy {
                 sourceIp: remoteIP,
                 sourcePort: socket.remotePort || 0,
                 destIp: socket.localAddress || '',
-                destPort: socket.localPort || 0
+                destPort: socket.localPort || 0,
               };
 
               SniHandler.extractSNIWithResumptionSupport(chunk, debugConnInfo, true);
@@ -1823,7 +1877,8 @@ export class PortProxy {
               );
             }
 
-            const networkProxyPort = domainConfig.networkProxyPort || this.settings.networkProxyPort;
+            const networkProxyPort =
+              domainConfig.networkProxyPort || this.settings.networkProxyPort;
 
             if (initialChunk && connectionRecord.isTLS) {
               // For TLS connections with initial chunk, forward to NetworkProxy
@@ -1861,7 +1916,10 @@ export class PortProxy {
                 )}`
               );
             }
-          } else if (this.settings.defaultAllowedIPs && this.settings.defaultAllowedIPs.length > 0) {
+          } else if (
+            this.settings.defaultAllowedIPs &&
+            this.settings.defaultAllowedIPs.length > 0
+          ) {
             if (
               !isGlobIPAllowed(
                 remoteIP,
@@ -1974,6 +2032,7 @@ export class PortProxy {
           initialDataReceived = false;
 
           socket.once('data', (chunk: Buffer) => {
+            // Clear timeout immediately
             if (initialTimeout) {
               clearTimeout(initialTimeout);
               initialTimeout = null;
@@ -1981,6 +2040,23 @@ export class PortProxy {
             
             initialDataReceived = true;
             
+            // Add debugging ONLY if detailed logging is enabled - avoid heavy processing
+            if (this.settings.enableTlsDebugLogging && SniHandler.isClientHello(chunk)) {
+              // Move heavy debug logging to a separate async task to not block the flow
+              setImmediate(() => {
+                try {
+                  const resumptionInfo = SniHandler.hasSessionResumption(chunk, true);
+                  const standardSNI = SniHandler.extractSNI(chunk, true);
+                  const pskSNI = SniHandler.extractSNIFromPSKExtension(chunk, true);
+                  
+                  console.log(`[${connectionId}] ClientHello details: isResumption=${resumptionInfo.isResumption}, hasSNI=${resumptionInfo.hasSNI}`);
+                  console.log(`[${connectionId}] SNI extraction results: standardSNI=${standardSNI || 'none'}, pskSNI=${pskSNI || 'none'}`);
+                } catch (err) {
+                  console.log(`[${connectionId}] Error in debug logging: ${err}`);
+                }
+              });
+            }
+
             // Block non-TLS connections on port 443
             // Always enforce TLS on standard HTTPS port
             if (!SniHandler.isTlsHandshake(chunk) && localPort === 443) {
@@ -2012,12 +2088,18 @@ export class PortProxy {
               // Check for session tickets if allowSessionTicket is disabled
               if (this.settings.allowSessionTicket === false && SniHandler.isClientHello(chunk)) {
                 // Analyze for session resumption attempt
-                const resumptionInfo = SniHandler.hasSessionResumption(chunk, this.settings.enableTlsDebugLogging);
+                const resumptionInfo = SniHandler.hasSessionResumption(
+                  chunk,
+                  this.settings.enableTlsDebugLogging
+                );
 
                 if (resumptionInfo.isResumption) {
                   // Always log resumption attempt for easier debugging
                   // Try to extract SNI for logging
-                  const extractedSNI = SniHandler.extractSNI(chunk, this.settings.enableTlsDebugLogging);
+                  const extractedSNI = SniHandler.extractSNI(
+                    chunk,
+                    this.settings.enableTlsDebugLogging
+                  );
                   console.log(
                     `[${connectionId}] Session resumption detected in SNI handler. ` +
                       `Has SNI: ${resumptionInfo.hasSNI ? 'Yes' : 'No'}, ` +
@@ -2054,11 +2136,12 @@ export class PortProxy {
                 sourceIp: remoteIP,
                 sourcePort: socket.remotePort || 0,
                 destIp: socket.localAddress || '',
-                destPort: socket.localPort || 0
+                destPort: socket.localPort || 0,
               };
 
               // Use the new processTlsPacket method for comprehensive handling
-              serverName = SniHandler.processTlsPacket(
+              serverName =
+                SniHandler.processTlsPacket(
                   chunk,
                   connInfo,
                   this.settings.enableTlsDebugLogging,

ts/classes.snihandler.ts

@@ -1321,6 +1321,7 @@ export class SniHandler {
    * @param cachedSni - Optional cached SNI from previous connections (for racing detection)
    * @returns The extracted server name or undefined if not found or more data needed
    */
+
   public static processTlsPacket(
     buffer: Buffer,
     connectionInfo: {
@@ -1373,6 +1374,74 @@ export class SniHandler {
       return undefined;
     }
 
+    // Enhanced session resumption detection
+    if (this.isClientHello(buffer)) {
+      const resumptionInfo = this.hasSessionResumption(buffer, enableLogging);
+
+      if (resumptionInfo.isResumption) {
+        log(`Session resumption detected in TLS packet`);
+
+        // Always try standard SNI extraction first
+        const standardSni = this.extractSNI(buffer, enableLogging);
+        if (standardSni) {
+          log(`Found standard SNI in session resumption: ${standardSni}`);
+
+          // Cache this SNI
+          this.cacheSession(connectionInfo.sourceIp, standardSni);
+          return standardSni;
+        }
+
+        // Enhanced session resumption SNI extraction
+        // Try extracting from PSK identity
+        const pskSni = this.extractSNIFromPSKExtension(buffer, enableLogging);
+        if (pskSni) {
+          log(`Extracted SNI from PSK extension: ${pskSni}`);
+          this.cacheSession(connectionInfo.sourceIp, pskSni);
+          return pskSni;
+        }
+
+        // Additional check for SNI in session tickets
+        if (enableLogging) {
+          log(`Checking for session ticket information to extract server name...`);
+          // Log more details for debugging
+          try {
+            // Look at the raw buffer for patterns
+            log(`Buffer hexdump (first 100 bytes): ${buffer.slice(0, 100).toString('hex')}`);
+
+            // Try to find hostname-like patterns in the buffer
+            const bufferStr = buffer.toString('utf8', 0, buffer.length);
+            const hostnamePattern =
+              /([a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?/gi;
+            const hostMatches = bufferStr.match(hostnamePattern);
+
+            if (hostMatches && hostMatches.length > 0) {
+              log(`Possible hostnames found in buffer: ${hostMatches.join(', ')}`);
+
+              // Check if any match looks like a valid domain
+              for (const match of hostMatches) {
+                if (match.includes('.') && match.length > 3) {
+                  log(`Potential SNI found in session data: ${match}`);
+                  // Don't automatically use this - just log for debugging
+                }
+              }
+            }
+          } catch (e) {
+            log(`Error scanning for patterns: ${e}`);
+          }
+        }
+
+        // If we still don't have SNI, check for cached sessions
+        const cachedSni = this.getCachedSession(connectionInfo.sourceIp);
+        if (cachedSni) {
+          log(`Using cached SNI for session resumption: ${cachedSni}`);
+          return cachedSni;
+        }
+
+        log(`Session resumption without extractable SNI`);
+        // If allowSessionTicket=false, should be rejected by caller
+      }
+    }
+
     // For handshake messages, try the full extraction process
     const sni = this.extractSNIWithResumptionSupport(buffer, connectionInfo, enableLogging);