snmp4j snmpwalk與社區字符串索引

Question

如何使用snmp4j和社區字符串索引做snmpwalk？

我可以通過改變社會的字符串，例如公共@ 123 （123是VLANID）

做一個共用字符串索引但這僅適用於SNMPGET !! ??：

public ResponseEvent get(OID oids) throws IOException { 
    PDU pdu = new PDU(); 
    pdu.add(new VariableBinding(oid)); 
    pdu.setType(PDU.GETNEXT); 
    ResponseEvent event = snmp.send(pdu, getTarget(), null); 
} 

private Target getTarget() { 
    Address targetAddress = GenericAddress.parse(sw.getAddress()); 
    CommunityTarget target = new CommunityTarget(); 
    target.setCommunity(new OctetString(communityString)); 
    target.setAddress(targetAddress); 
    target.setRetries(2); 
    target.setTimeout(1500); 
    target.setVersion(SnmpConstants.version2c); 
    return target; 
} 

但當我嘗試做一個snmpwalk的這樣，我收到了超時

public HashMap<String, String> snmpWalk(String strOid) throws IOException { 
    OID oid = new OID(strOid); 
    TreeUtils treeUtils = new TreeUtils(snmp, new DefaultPDUFactory()); 
    HashMap<String, String> snmpResult = new HashMap<String, String>(); 
    List<TreeEvent> events = treeUtils.getSubtree(getTarget(), oid); 
    // some more code ... 
} 

Answer 1

我寫A S固定的問題

/** maxRepetitions needs to be set for BULKGET to work<br> 
* it defines the maximum lines/results returned for one request. 
*/ 
private int maxRepetitions = 50; 

/** maxSizeResponsePDU needs to be set for BULKGET to work */ 
private int maxSizeResponsePDU = 65535; 

public HashMap<String, String> snmpWalk (String startOid) throws IOException{ 
    //String startOid = "1.3.6.1.4.1.9.9.46.1.3.1.1.4.1"; 
    String oid = startOid; 
    HashMap<String, String> varBindings = new HashMap<String, String>(); 

    while (oid.startsWith(startOid)) { 
     PDU pdu = getVariableBinding(new OID(oid), PDU.GETBULK); 
     if (pdu == null || pdu.size() == 0) return varBindings; 

     for (int i=0; i<pdu.size(); i++) { 
      VariableBinding var = pdu.get(i); 
      if (var == null) return varBindings; 

      oid = var.getOid().toString(); 
      if (oid.startsWith(startOid)) { 
       varBindings.put(oid, var.getVariable().toString()); 
      } else { 
       return varBindings; 
      } 
     } 
    } 
    return varBindings; 
} 

/** 
* Method which takes a single OID and returns the response from the agent 
* as a String. 
* 
* @param oid 
* @return 
* @throws IOException 
*/ 
public PDU getVariableBinding(OID oid, int type) throws IOException { 
    ResponseEvent event = get(new OID[] { oid }, type); 

    if (event == null || event.getResponse() == null) { 
     warn(oid); 
     return null; 
    } 

    return event.getResponse(); 
} 

public ResponseEvent get(OID oids[], int type) throws IOException { 
    PDU pdu = new PDU(); 
    for (OID oid : oids) { 
     pdu.add(new VariableBinding(oid)); 
    } 
    pdu.setType(type); 

    pdu.setMaxRepetitions(maxRepetitions); // This makes GETBULK work as expected 

    ResponseEvent event = snmp.send(pdu, getTarget(), null); 
    if (event != null) { 
     return event; 
    } 
    throw new RuntimeException("GET timed out"); 
} 

private Target getTarget() { 
    Address targetAddress = GenericAddress.parse(sw.getAddress()); 
    CommunityTarget target = new CommunityTarget(); 
    target.setCommunity(new OctetString(communityString)); 
    target.setAddress(targetAddress); 
    target.setRetries(2); 
    target.setTimeout(3000); 
    target.setVersion(SnmpConstants.version2c); 

    target.setMaxSizeRequestPDU(maxSizeResponsePDU); // This makes GETBULK work as expected 

    return target; 
} 

Answer 2

隨着SNMP4J有它已經爲您提供了實現這裏的「走」功能TreeUtils class：使用GETBULK

設置maxRepetitions這是重要的，maxSizeResponsePDU我用這個值NMP-走法併爲maxRepetitions和nonRepeaters字段設置合理的默認值。