libajp13 - A complete AJPv1.3 Java library

libajp13 is a fully featured open source library implementing the Apache JServ Protocol version 1.3 (ajp13), based on the Apache Protocol Reference.

The library has been developed from Espen Wiborg's ajp_client. At this point, most of the code has been refactored and improved to support all AJP13 packet types.

Issues

This implementation is derived from Dan Milstein's reversing work, based on Tomcat 3.x AJP code. If you've discovered a bug, please open an issue in Github.

As of 02/27/2017, the JaCoCoverage analysis of project "libajp13" reports:

How To Use it

The following code examples show how to use libajp13.

For more details, please refer to the official JavaDoc.

CPing and CPong

//Create a CPing message
AjpMessage msg = new CPingMessage();
//Send the content of the packet - msg.getBytes()
[...]
AjpMessage reply = AjpReader.parseMessage(gotBytes);
if (reply instanceof CPongMessage) {
  System.out.println("[OK] Valid CPong");
}

Shutdown

AjpMessage msg = new ShutdownMessage();

EndResponse with session reuse set to 'true'

AjpMessage msg = new EndResponseMessage(true);

SendBodyChunkMessage

AjpMessage msg = new SendBodyChunkMessage("ABCD".getBytes());

SendHeadersMessage

List<Pair<String, String>> headers = new LinkedList<>();
headers.add(Pair.make("Content-Type","text/html; charset=utf-8"));
AjpMessage msg = new SendHeadersMessage(200,"OK",headers);

GetBodyChunkMessage

AjpMessage msg = new GetBodyChunkMessage(10);

BodyMessage

AjpMessage msg = new BodyMessage("MyStringSentAsBytes".getBytes());

ForwardRequestMessage to build a simple GET request

List<Pair<String, String>> headers = new LinkedList<>();
headers.add(Pair.make("Content-Type","text/html; charset=utf-8"));
AjpMessage msg = new ForwardRequestMessage(2, new URL("http://127.0.0.1/"), headers, null);

ForwardRequestMessage using ForwardRequestMessageGetBuilder

AjpMessage msg = ForwardRequestMessage.ForwardRequestMessageGetBuilder(new URL("http://192.168.1.1/log/"));

ForwardRequestMessage to build a PUT request with custom headers and attributes

List<Pair<String, String>> headers = new LinkedList<>();
headers.add(Pair.make("Content-Type","text/html; charset=utf-8"));
headers.add(Pair.make("CustomHeaderName","CustomHeaderValue"));
List<Pair<String, String>> attributes = new LinkedList<>();
attributes.add(Pair.make("jvm_route","3131212"));
attributes.add(Pair.make("custom_attribute","custom_value"));
AjpMessage msg = new ForwardRequestMessage(5, "HTTP/1.0", "/api/", "127.0.0.1", "localhost", "127.0.0.1", 8009, true, headers, attributes);

Useful links

• https://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html
• https://tomcat.apache.org/tomcat-7.0-doc/api/org/apache/coyote/ajp/Constants.html
• https://github.com/kohsuke/ajp-client
• http://isu.ifmo.ru/docs/IAS904/web.904/q20202/protocol/AJPv21.html
• http://en.wikipedia.org/wiki/Apache_JServ_Protocol
• https://tomcat.apache.org/tomcat-7.0-doc/config/ajp.html