Nirmalya Sinha Nirmalya Sinha - 5 months ago 14
Java Question

Netconf: Not able to perform getConfig()

We have a netconf enabled router and I am able to perform get/get-config operations using Mg-Soft client browser. This is the output of getConfig() -

REQ:

<nc:get-config xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0">
<nc:source>
<nc:running/>
</nc:source>
</nc:get-config>


RESP:

<?xml version="1.0" encoding="utf-8"?>
<data xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
<configure xmlns="urn:nokia.com:sros:ns:yang:sr:conf">
<qos>
<sap-ingress>
.....
</data>


But I am unable to perform the same operation using tailf Netconf client.
Here is my code -

public class Client {
public static void main(String args[]) throws JNCException,
ParserConfigurationException, SAXException, IOException {

DeviceUser deviceUser;
String deviceUserName = "user";
deviceUser = new DeviceUser(deviceUserName, "admin", "admin");
Device device = new Device("simulator", deviceUser, "10.135.16.13", 830);
device.connect(deviceUserName);
device.newSession(new Subscriber("simulator"), "mySession");
NetconfSession session = device.getSession("mySession");

NodeSet config = session.getConfig(NetconfSession.RUNNING);
String xmlString = config.toXMLString();
session.closeSession();
System.out.println(xmlString);
}
}

class Subscriber extends IOSubscriber {
String devName;
public static boolean rawMode = false;
Subscriber(String devName) {
super(rawMode);
this.devName = devName;
}
public void input(String data) {
System.out.println("RECV: " + data);
}

public void output(String data) {
System.out.println("SEND: " + data);
}
}


I am getting the following in the eclipse console -

SEND: <hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
<capabilities>
<capability>urn:ietf:params:netconf:base:1.0</capability>
</capabilities>
</hello>

RECV: <hello xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
<capabilities>
<capability>urn:ietf:params:netconf:base:1.0</capability>
<capability>urn:ietf:params:netconf:base:1.1</capability>
<capability>urn:ietf:params:netconf:capability:writable-running:1.0</capability>
<capability>urn:ietf:params:netconf:capability:candidate:1.0</capability>
<capability>urn:ietf:params:netconf:capability:validate:1.0</capability>
<capability>urn:ietf:params:netconf:capability:validate:1.1</capability>
<capability>urn:ietf:params:netconf:capability:startup:1.0</capability>
<capability>urn:ietf:params:netconf:capability:url:1.0?scheme=ftp,tftp,file</capability>
<capability>urn:ietf:params:netconf:capability:with-defaults:1.0?basic-mode=trim&amp;also-supported=report-all</capability>
<capability>urn:ietf:params:xml:ns:netconf:base:1.0?module=ietf-netconf&amp;revision=2011-06-01&amp;features=writable-running,validate,startup,url&amp;deviations=alu-netconf-deviations-r13</capability>
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<session-id>52</session-id>
</hello>

SEND: <nc:rpc xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" nc:message-id="1">
<nc:get-config>
<nc:source>
<nc:running/> </nc:source>
</nc:get-config>
</nc:rpc>

RECV: <?xml version="1.0" encoding="UTF-8"?>
<rpc-reply urn:ietf:params:xml:ns:netconf:base:1.0:message-id="1" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
<rpc-error>
<error-type>rpc</error-type>
<error-tag>missing-attribute</error-tag>
<error-severity>error</error-severity>
<error-info>
<bad-element>message-id</bad-element>
<bad-element>rpc</bad-element>
</error-info>
<error-message>
Check that message-id attribute is present and less than 4096 characters
</error-message>
</rpc-error>
</rpc-reply>

[Fatal Error] :2:20: Attribute name "urn:ietf" associated with an element type "rpc-reply" must be followed by the ' = ' character.
[Fatal Error] :2:20: Attribute name "urn:ietf" associated with an element type "rpc-reply" must be followed by the ' = ' character.
org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 20; Attribute name "urn:ietf" associated with an element type "rpc-reply" must be followed by the ' = ' character.
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
at com.tailf.jnc.YangXMLParser.parse(YangXMLParser.java:50)
at com.tailf.jnc.XMLParser.parse(XMLParser.java:154)
at com.tailf.jnc.NetconfSession.recv_rpc_reply(NetconfSession.java:1495)
at com.tailf.jnc.NetconfSession.recv_rpc_reply_data(NetconfSession.java:1472)
at com.tailf.jnc.NetconfSession.getConfig(NetconfSession.java:443)
at client.Client.main(Client.java:51)
Exception in thread "main" Parse error: parse error: org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 20; Attribute name "urn:ietf" associated with an element type "rpc-reply" must be followed by the ' = ' character.
at com.tailf.jnc.YangXMLParser.parse(YangXMLParser.java:54)
at com.tailf.jnc.XMLParser.parse(XMLParser.java:154)
at com.tailf.jnc.NetconfSession.recv_rpc_reply(NetconfSession.java:1495)
at com.tailf.jnc.NetconfSession.recv_rpc_reply_data(NetconfSession.java:1472)
at com.tailf.jnc.NetconfSession.getConfig(NetconfSession.java:443)
at client.Client.main(Client.java:51)

Answer

You actually seem to have two problems, neither of which appear to be your fault. The get-config request from JNC seems to be malformed: message-id attribute should be in the default namespace, not in NETCONF message namespace.

SEND: <nc:rpc xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" nc:message-id="1">
  <nc:get-config>
    <nc:source>
      <nc:running/>    </nc:source>
  </nc:get-config>
</nc:rpc>

Should actually be:

SEND: <nc:rpc xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
  <nc:get-config>
    <nc:source>
      <nc:running/>    </nc:source>
  </nc:get-config>
</nc:rpc>

The second problem is your server, which appears to be unable to handle this malformed request - and is responding with a malformed message (it is not even an XML message):

RECV: <?xml version="1.0" encoding="UTF-8"?>
<rpc-reply urn:ietf:params:xml:ns:netconf:base:1.0:message-id="1" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <rpc-error>
        <error-type>rpc</error-type>
        <error-tag>missing-attribute</error-tag>
        <error-severity>error</error-severity>
        <error-info>
            <bad-element>message-id</bad-element>
            <bad-element>rpc</bad-element>
        </error-info>
        <error-message>
            Check that message-id attribute is present and less than 4096 characters
        </error-message>
    </rpc-error>
</rpc-reply>

It should be responding with:

RECV: <?xml version="1.0" encoding="UTF-8"?>
<rpc-reply nc:message-id="1" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
    <rpc-error>
        <error-type>rpc</error-type>
        <error-tag>missing-attribute</error-tag>
        <error-severity>error</error-severity>
        <error-info>
            <bad-element>message-id</bad-element>
            <bad-element>rpc</bad-element>
        </error-info>
        <error-message>
            Check that message-id attribute is present and less than 4096 characters
        </error-message>
    </rpc-error>
</rpc-reply>

since it is supposed to return all attributes verbatim. Otherwise, this would be standard behavior when a message without a message-id attribute is sent to a server.

Relevant RFC4741 text below (the same applies to RFC6241, NETCONF 1.1).

Section 4.1:

The <rpc> element has a mandatory attribute "message-id", which is an arbitrary string chosen by the sender of the RPC that will commonly encode a monotonically increasing integer. The receiver of the RPC does not decode or interpret this string but simply saves it to be used as a "message-id" attribute in any resulting <rpc-reply> message. For example: <rpc message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <some-method> <!-- method parameters here... --> </some-method> </rpc>

If additional attributes are present in an <rpc> element, a NETCONF peer MUST return them unmodified in the <rpc-reply> element.

Section 4.3

An error is returned if an <rpc> element is received without a message-id attribute. Note that only in this case is it acceptable for the NETCONF peer to omit the message-id attribute in the <rpc-reply> element.

<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <get-config> <source> <running/> </source> </get-config> </rpc>

<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <rpc-error> <error-type>rpc</error-type> <error-tag>missing-attribute</error-tag> <error-severity>error</error-severity> <error-info> <bad-attribute>message-id</bad-attribute> <bad-element>rpc</bad-element> </error-info> </rpc-error> </rpc-reply>

So I believe you should be reporting two issues to both the maker of the device and to creators of JNC.

The reason it is working with the MG-SOFT client is that it sends a proper message-id attribute, so your case never happens.