Fix timeout configuration bug

TransportImpl now uses timeout from Config instead of hardcoded value.

Added getTimeoutMs/setTimeoutMs to Config interface so users can configure timeout before creating SSH connection.

Fixes #1028

Author: melihbirim

src/main/java/net/schmizz/sshj/Config.java

@@ -204,4 +204,19 @@ public interface Config {
     int getMaxCircularBufferSize();
 
     void setMaxCircularBufferSize(int maxCircularBufferSize);
+
+    /**
+     * Returns the timeout in milliseconds for blocking operations (e.g., authentication, channel open, etc.).
+     * The default value is 30000 milliseconds (30 seconds).
+     *
+     * @return the timeout in milliseconds
+     */
+    int getTimeoutMs();
+
+    /**
+     * Sets the timeout in milliseconds for blocking operations (e.g., authentication, channel open, etc.).
+     *
+     * @param timeoutMs the timeout in milliseconds
+     */
+    void setTimeoutMs(int timeoutMs);
 }

src/main/java/net/schmizz/sshj/ConfigImpl.java

@@ -51,6 +51,7 @@ public class ConfigImpl
     private boolean verifyHostKeyCertificates = true;
     // HF-982: default to 16MB buffers.
     private int maxCircularBufferSize = 16 * 1024 * 1024;
+    private int timeoutMs = 30 * 1000; // Default to 30 seconds
 
     @Override
     public List<Factory.Named<Cipher>> getCipherFactories() {
@@ -202,6 +203,16 @@ public void setVerifyHostKeyCertificates(boolean value) {
         verifyHostKeyCertificates = value;
     }
 
+    @Override
+    public int getTimeoutMs() {
+        return timeoutMs;
+    }
+
+    @Override
+    public void setTimeoutMs(int timeoutMs) {
+        this.timeoutMs = timeoutMs;
+    }
+
     /**
      * Modern servers neglect the key algorithm ssh-rsa. OpenSSH 8.8 even dropped its support by default in favour
      * of rsa-sha2-*. However, there are legacy servers like Apache SSHD that don't support the newer replacements

src/main/java/net/schmizz/sshj/transport/TransportImpl.java

@@ -98,7 +98,7 @@ static final class ConnInfo {
      */
     private final String clientID;
 
-    private volatile int timeoutMs = 30 * 1000; // Crazy long, but it was the original default
+    private volatile int timeoutMs;
 
     private volatile boolean authed = false;
 
@@ -142,6 +142,7 @@ public TransportImpl(Config config) {
         this.decoder = new Decoder(this);
         this.kexer = new KeyExchanger(this);
         this.clientID = String.format("SSH-2.0-%s", config.getVersion());
+        this.timeoutMs = config.getTimeoutMs();
     }
 
     @Override

src/test/groovy/net/schmizz/sshj/ConfigImplSpec.groovy

@@ -84,4 +84,23 @@ class ConfigImplSpec extends Specification {
         then:
         config.keyAlgorithms == [ED25519, SSH_RSA, RSA_SHA_512, ECDSA, RSA_SHA_256]
     }
+
+    def "default timeout should be 30 seconds"() {
+        given:
+        def config = new DefaultConfig()
+
+        expect:
+        config.getTimeoutMs() == 30000
+    }
+
+    def "timeout can be set and retrieved"() {
+        given:
+        def config = new DefaultConfig()
+
+        when:
+        config.setTimeoutMs(60000)
+
+        then:
+        config.getTimeoutMs() == 60000
+    }
 }

src/test/java/net/schmizz/sshj/transport/TransportImplTimeoutTest.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * 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.
+ */
+package net.schmizz.sshj.transport;
+
+import net.schmizz.sshj.Config;
+import net.schmizz.sshj.DefaultConfig;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class TransportImplTimeoutTest {
+
+    @Test
+    void shouldUseDefaultTimeoutFromConfig() {
+        Config config = new DefaultConfig();
+        Transport transport = new TransportImpl(config);
+
+        assertThat(transport.getTimeoutMs()).isEqualTo(30000);
+    }
+
+    @Test
+    void shouldUseCustomTimeoutFromConfig() {
+        Config config = new DefaultConfig();
+        config.setTimeoutMs(60000);
+        Transport transport = new TransportImpl(config);
+
+        assertThat(transport.getTimeoutMs()).isEqualTo(60000);
+    }
+
+    @Test
+    void shouldAllowChangingTimeoutAfterCreation() {
+        Config config = new DefaultConfig();
+        Transport transport = new TransportImpl(config);
+
+        transport.setTimeoutMs(45000);
+
+        assertThat(transport.getTimeoutMs()).isEqualTo(45000);
+    }
+}