103 lines
3.7 KiB
Markdown
103 lines
3.7 KiB
Markdown
# j3270
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[](https://git.hugfreevikings.wtf/rudi/j3270/actions)
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[](https://git.hugfreevikings.wtf/rudi/j3270/releases)
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[](https://adoptium.net)
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[](LICENSE)
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An **x3270-aligned IBM 3270 mainframe terminal emulator** written in pure Java. Designed for high compatibility with IBM z/OS, z/VM, CMS, and TSO systems over TN3270 and TN3270E.
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---
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## 🚀 Quick Download & Run
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### Latest Standalone JAR
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You can download the ready-to-run executable JAR directly from the releases or CI builds:
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- **[Download Latest Tagged Release (`j3270.jar`)](https://git.hugfreevikings.wtf/rudi/j3270/releases)**
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- **[Latest Nightly CI Artifacts](https://git.hugfreevikings.wtf/rudi/j3270/actions)** (Download under the latest successful workflow run)
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### Running `j3270`
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Requires **Java 11 or higher** (Java 11, 17, 21+):
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```bash
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# Launch interactive GUI
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java -jar j3270.jar
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# Connect to TLS/SSL mainframe with custom port
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java -jar j3270.jar -s mainframe.example.com 992
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# Or using standard x3270 L: prefix
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java -jar j3270.jar L:mainframe.example.com:992
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# Connect via Plain TN3270 (Non-E)
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java -jar j3270.jar -P mainframe.example.com 23
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# Or using standard x3270 P: prefix
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java -jar j3270.jar P:mainframe.example.com:23
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# Connect with unverified/self-signed certificate verification bypass
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java -jar j3270.jar --tls --insecure mainframe.example.com 992
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# Launch with custom configuration file
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java -jar j3270.jar -c config.ini
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# Launch directly from source runner
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./run.sh
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```
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---
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## ✨ Features
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- **TN3270 & TN3270E Protocol Support**: RFC 2355 compliant state machine, negotiation, Device-Type query, plain TN3270 fallback, and SSL/TLS encryption.
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- **SSL/TLS Security**:
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- Encrypted TN3270 over TLS connections on standard port `992` or custom ports.
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- Interactive certificate verification prompt for self-signed or untrusted certificates with fingerprint, subject, issuer, and validity inspection.
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- Optional unverified/insecure mode for testing and headless scripting.
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- **IND$FILE File Transfer**: Full support for both **CUT** and **DFT (DDM)** high-speed structured field transfers with ASCII/binary translation, CRLF handling, and recfm/lrecl formatting for TSO, VM/CMS, and CICS.
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- **z/VM & Line-Mode Support**: Proper SSCP-LU and unformatted line handling (`CP TERM CONMODE 3270` supported).
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- **APL & Graphic Escape**: Comprehensive box-drawing and math symbol character rendering.
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- **Terminal Models**:
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- Model 2 (24x80)
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- Model 3 (32x80)
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- Model 4 (43x80)
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- Model 5 (27x132)
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- **Zero-Dependency Core**: Modular architecture separated into:
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- `lib3270j`: Reusable Java 3270 protocol, data stream parser, charset translation, and telnet state machine.
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- `j3270`: Desktop Swing user interface and session management.
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---
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## 🛠️ Building from Source
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### Standalone Build (No Gradle Required)
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The project includes self-contained, portable build scripts:
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```bash
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# Build executable JAR in 2 seconds:
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sh ./build_all.sh
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# Run all 57 automated unit tests in ~500ms:
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sh ./test_all.sh
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```
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The resulting standalone JAR is created at `build/j3270.jar`.
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### Gradle Build (Optional)
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```bash
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./gradlew build
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./gradlew test
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```
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---
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## 📜 Acknowledgements
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- [x3270](https://x3270.miraheze.org/wiki/Main_Page) — Reference C implementation and protocol specifications
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- [Antigravity](https://antigravity.google/)
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- Claude Opus 4.6
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- Gemini 3.1 Pro
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- Gemini 3.7 Flash
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- Gemma4 12B and 26B
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- GPT-OSS 120B
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- Qwen3 4B and 32B
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