fix(pop3): run socket.destroy() if pop3 socket is not closed in 1.5s

imap-core/lib/imap-connection.js

@@ -93,6 +93,8 @@ class IMAPConnection extends EventEmitter {
         this._closing = false;
         this._closed = false;
 
+        this._closingTimeout = null;
+
         this.logger = {};
         ['info', 'debug', 'error'].forEach(level => {
             this.logger[level] = (...args) => {
@@ -286,6 +288,7 @@ class IMAPConnection extends EventEmitter {
 
                 setImmediate(() => this._onClose());
             }, 1500);
+            this._closingTimeout.unref();
         }
 
         this._closing = true;

lib/pop3/connection.js

@@ -22,6 +22,7 @@ class POP3Connection extends EventEmitter {
 
         this._closed = false;
         this._closing = false;
+        this._closingTimeout = null;
 
         this.secured = !!this._server.options.secure;
         this._upgrading = false;
@@ -116,6 +117,7 @@ class POP3Connection extends EventEmitter {
      * @event
      */
     _onClose(/* hadError */) {
+        clearTimeout(this._closingTimeout);
         if (this._closed) {
             return;
         }
@@ -138,6 +140,9 @@ class POP3Connection extends EventEmitter {
             this.remoteAddress
         );
 
+        // clear session
+        this.session = null;
+
         this.emit('close');
     }
 
@@ -184,9 +189,32 @@ class POP3Connection extends EventEmitter {
     }
 
     close() {
+        if (this._closed || this._closing) {
+            return;
+        }
+
         if (!this._socket.destroyed && this._socket.writable) {
             this._socket.end();
         }
+
+        this._server.connections.delete(this);
+
+        // allow socket to close in 1500ms or force it to close
+        this._closingTimeout = setTimeout(() => {
+            if (this._closed) {
+                return;
+            }
+
+            try {
+                this._socket.destroy();
+            } catch (err) {
+                // ignore
+            }
+
+            setImmediate(() => this._onClose());
+        }, 1500);
+        this._closingTimeout.unref();
+
         this._closing = true;
     }
 

package.json

@@ -53,7 +53,7 @@
         "base32.js": "0.1.0",
         "bcryptjs": "2.4.3",
         "bson": "6.1.0",
-        "bullmq": "4.12.0",
+        "bullmq": "4.12.1",
         "fido2-lib": "3.4.1",
         "gelf": "2.0.1",
         "generate-password": "1.7.0",
@@ -66,7 +66,7 @@
         "ioredis": "5.3.2",
         "ipaddr.js": "2.1.0",
         "isemail": "3.2.0",
-        "joi": "17.10.2",
+        "joi": "17.11.0",
         "js-yaml": "4.1.0",
         "key-fingerprint": "1.1.0",
         "libbase64": "1.2.1",