java - 网络 session : Not able to perform getConfig()

Question

我们有一个支持 netconf 的路由器，我可以使用 Mg-Soft 客户端浏览器执行获取/获取配置操作。这是 getConfig() 的输出 -

请求:

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

响应:

<?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>

但我无法使用 tailf Netconf 客户端执行相同的操作。这是我的代码-

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);
    }
}

我在 eclipse 控制台中得到以下信息 -

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>
    <capability>urn:alcatel-lucent.com:sros:ns:yang:netconf-deviations-r13?module=alu-netconf-deviations-r13&amp;revision=2015-01-23</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 1

您实际上似乎有两个问题，但都不是您的错。来自 JNC 的 get-config 请求似乎格式不正确:message-id属性应该在默认命名空间中，而不是在 NETCONF 消息命名空间中。

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>

实际上应该是:

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>

第二个问题是您的服务器，它似乎无法处理这个格式错误的请求 - 并且正在响应格式错误的消息(它甚至不是 XML 消息):

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>

它应该响应:

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>

因为它应该逐字返回所有属性。否则，当消息没有 message-id 时，这将是标准行为属性被发送到服务器。

相关RFC4741文本如下(同样适用于RFC6241，NETCONF 1.1)。

Section 4.1 :

The <rpc> element has a mandatory attribute "message-id", which is anarbitrary string chosen by the sender of the RPC that will commonlyencode a monotonically increasing integer. The receiver of the RPCdoes not decode or interpret this string but simply saves it to beused 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 NETCONFpeer MUST return them unmodified in the <rpc-reply> element.

Section 4.3

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


所以我认为您应该向设备制造商和 JNC 的创建者报告两个问题。

它与 MG-SOFT 客户端一起工作的原因是它发送一个正确的 message-id属性，因此您的情况永远不会发生。