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org.apache.nifi.snmp.utils.SNMPUtils Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.nifi.snmp.utils;
import org.apache.nifi.snmp.exception.InvalidAuthProtocolException;
import org.apache.nifi.snmp.exception.InvalidPrivProtocolException;
import org.apache.nifi.snmp.exception.InvalidSnmpVersionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.snmp4j.PDU;
import org.snmp4j.PDUv1;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.security.AuthHMAC128SHA224;
import org.snmp4j.security.AuthHMAC192SHA256;
import org.snmp4j.security.AuthHMAC256SHA384;
import org.snmp4j.security.AuthHMAC384SHA512;
import org.snmp4j.security.AuthMD5;
import org.snmp4j.security.AuthSHA;
import org.snmp4j.security.Priv3DES;
import org.snmp4j.security.PrivAES128;
import org.snmp4j.security.PrivAES192;
import org.snmp4j.security.PrivAES256;
import org.snmp4j.security.PrivDES;
import org.snmp4j.smi.AbstractVariable;
import org.snmp4j.smi.AssignableFromInteger;
import org.snmp4j.smi.AssignableFromLong;
import org.snmp4j.smi.AssignableFromString;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.Variable;
import org.snmp4j.smi.VariableBinding;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Vector;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
/**
* Utility helper class that simplifies interactions with target SNMP API and NIFI API.
*/
public final class SNMPUtils {
public static final String SNMP_PROP_DELIMITER = "$";
public static final String SNMP_PROP_PREFIX = "snmp" + SNMP_PROP_DELIMITER;
private static final Logger logger = LoggerFactory.getLogger(SNMPUtils.class);
private static final String OID_PROP_PATTERN = SNMP_PROP_PREFIX + "%s" + SNMP_PROP_DELIMITER + "%s";
private static final Pattern OID_PATTERN = Pattern.compile("[0-9+.]*");
private static final Map AUTH_MAP;
private static final Map PRIV_MAP;
private static final Map REPORT_MAP;
private static final Map VERSION_MAP;
private SNMPUtils() {
// hide implicit constructor
}
static {
final Map map = new HashMap<>();
map.put("1.3.6.1.6.3.15.1.1.1", "usmStatsUnsupportedSecLevels");
map.put("1.3.6.1.6.3.15.1.1.2", "usmStatsNotInTimeWindows");
map.put("1.3.6.1.6.3.15.1.1.3", "usmStatsUnknownUserNames");
map.put("1.3.6.1.6.3.15.1.1.4", "usmStatsUnknownEngineIDs");
map.put("1.3.6.1.6.3.15.1.1.5", "usmStatsWrongDigests");
map.put("1.3.6.1.6.3.15.1.1.6", "usmStatsDecryptionErrors");
REPORT_MAP = Collections.unmodifiableMap(map);
}
static {
final Map map = new HashMap<>();
map.put("DES", PrivDES.ID);
map.put("3DES", Priv3DES.ID);
map.put("AES128", PrivAES128.ID);
map.put("AES192", PrivAES192.ID);
map.put("AES256", PrivAES256.ID);
PRIV_MAP = Collections.unmodifiableMap(map);
}
static {
final Map map = new HashMap<>();
map.put("SHA", AuthSHA.ID);
map.put("MD5", AuthMD5.ID);
map.put("HMAC128SHA224", AuthHMAC128SHA224.ID);
map.put("HMAC192SHA256", AuthHMAC192SHA256.ID);
map.put("HMAC256SHA384", AuthHMAC256SHA384.ID);
map.put("HMAC384SHA512", AuthHMAC384SHA512.ID);
AUTH_MAP = Collections.unmodifiableMap(map);
}
static {
final Map map = new HashMap<>();
map.put("SNMPv1", SnmpConstants.version1);
map.put("SNMPv2c", SnmpConstants.version2c);
map.put("SNMPv3", SnmpConstants.version3);
VERSION_MAP = Collections.unmodifiableMap(map);
}
public static Map getPduAttributeMap(final PDU response) {
final Vector variableBindings = response.getVariableBindings();
final Map attributes = variableBindings.stream()
.collect(Collectors.toMap(k -> String.format(OID_PROP_PATTERN, k.getOid(), k.getSyntax()),
v -> v.getVariable().toString()
));
attributes.computeIfAbsent(SNMP_PROP_PREFIX + "errorIndex", v -> String.valueOf(response.getErrorIndex()));
attributes.computeIfAbsent(SNMP_PROP_PREFIX + "errorStatus", v -> String.valueOf(response.getErrorStatus()));
attributes.computeIfAbsent(SNMP_PROP_PREFIX + "errorStatusText", v -> response.getErrorStatusText());
attributes.computeIfAbsent(SNMP_PROP_PREFIX + "nonRepeaters", v -> String.valueOf(response.getNonRepeaters()));
attributes.computeIfAbsent(SNMP_PROP_PREFIX + "requestID", v -> String.valueOf(response.getRequestID()));
attributes.computeIfAbsent(SNMP_PROP_PREFIX + "type", v -> String.valueOf(response.getType()));
attributes.computeIfAbsent(SNMP_PROP_PREFIX + "typeString", v -> PDU.getTypeString(response.getType()));
return attributes;
}
public static Map getV1TrapPduAttributeMap(final PDUv1 v1TrapPdu) {
final Map trapAttributes = getPduAttributeMap(v1TrapPdu);
trapAttributes.computeIfAbsent(SNMP_PROP_PREFIX + "enterprise", v -> String.valueOf(v1TrapPdu.getEnterprise()));
trapAttributes.computeIfAbsent(SNMP_PROP_PREFIX + "agentAddress", v -> String.valueOf(v1TrapPdu.getAgentAddress()));
trapAttributes.computeIfAbsent(SNMP_PROP_PREFIX + "genericTrapType", v -> String.valueOf(v1TrapPdu.getGenericTrap()));
trapAttributes.computeIfAbsent(SNMP_PROP_PREFIX + "specificTrapType", v -> String.valueOf(v1TrapPdu.getSpecificTrap()));
trapAttributes.computeIfAbsent(SNMP_PROP_PREFIX + "timestamp", v -> String.valueOf(v1TrapPdu.getTimestamp()));
return trapAttributes;
}
public static Map createWalkOidValuesMap(final List variableBindings) {
final Map attributes = new HashMap<>();
variableBindings.forEach(vb -> addAttributeFromVariable(vb, attributes));
return attributes;
}
public static OID getPriv(final String privProtocol) {
if (PRIV_MAP.containsKey(privProtocol)) {
return PRIV_MAP.get(privProtocol);
}
throw new InvalidPrivProtocolException("Invalid privacy protocol provided.");
}
public static OID getAuth(final String authProtocol) {
if (AUTH_MAP.containsKey(authProtocol)) {
return AUTH_MAP.get(authProtocol);
}
throw new InvalidAuthProtocolException("Invalid authentication protocol provided.");
}
public static boolean addVariables(final PDU pdu, final Map attributes) {
boolean result = false;
try {
for (Map.Entry attributeEntry : attributes.entrySet()) {
if (attributeEntry.getKey().startsWith(SNMPUtils.SNMP_PROP_PREFIX)) {
final String[] splits = attributeEntry.getKey().split("\\" + SNMPUtils.SNMP_PROP_DELIMITER);
final String snmpPropName = splits[1];
final String snmpPropValue = attributeEntry.getValue();
if (SNMPUtils.OID_PATTERN.matcher(snmpPropName).matches()) {
final Optional var;
if (splits.length == 2) { // no SMI syntax defined
var = Optional.of(new OctetString(snmpPropValue));
} else {
final int smiSyntax = Integer.parseInt(splits[2]);
var = SNMPUtils.stringToVariable(snmpPropValue, smiSyntax);
}
if (var.isPresent()) {
final VariableBinding varBind = new VariableBinding(new OID(snmpPropName), var.get());
pdu.add(varBind);
result = true;
}
}
}
}
} catch (ArrayIndexOutOfBoundsException e) {
return false;
}
return result;
}
public static VariableBinding[] addGetVariables(final Map attributes) {
List variableBindings = new ArrayList<>();
try {
for (Map.Entry attributeEntry : attributes.entrySet()) {
if (attributeEntry.getKey().startsWith(SNMPUtils.SNMP_PROP_PREFIX)) {
final String[] splits = attributeEntry.getKey().split("\\" + SNMPUtils.SNMP_PROP_DELIMITER);
final String snmpPropName = splits[1];
if (SNMPUtils.OID_PATTERN.matcher(snmpPropName).matches()) {
variableBindings.add(new VariableBinding(new OID(snmpPropName)));
}
}
}
} catch (ArrayIndexOutOfBoundsException e) {
return new VariableBinding[0];
}
return variableBindings.toArray(new VariableBinding[0]);
}
public static OID[] addWalkVariables(final Map attributes) {
List oids = new ArrayList<>();
try {
for (Map.Entry attributeEntry : attributes.entrySet()) {
if (attributeEntry.getKey().startsWith(SNMPUtils.SNMP_PROP_PREFIX)) {
final String[] splits = attributeEntry.getKey().split("\\" + SNMPUtils.SNMP_PROP_DELIMITER);
final String snmpPropName = splits[1];
if (SNMPUtils.OID_PATTERN.matcher(snmpPropName).matches()) {
oids.add(new OID(snmpPropName));
}
}
}
} catch (ArrayIndexOutOfBoundsException e) {
return new OID[0];
}
return oids.toArray(new OID[0]);
}
private static void addAttributeFromVariable(final VariableBinding variableBinding, final Map attributes) {
attributes.put(SNMP_PROP_PREFIX + variableBinding.getOid() + SNMP_PROP_DELIMITER + variableBinding.getVariable().getSyntax(), variableBinding.getVariable().toString());
}
private static Optional stringToVariable(final String value, final int smiSyntax) {
Variable var = AbstractVariable.createFromSyntax(smiSyntax);
try {
if (var instanceof AssignableFromString) {
((AssignableFromString) var).setValue(value);
} else if (var instanceof AssignableFromInteger) {
((AssignableFromInteger) var).setValue(Integer.parseInt(value));
} else if (var instanceof AssignableFromLong) {
((AssignableFromLong) var).setValue(Long.parseLong(value));
} else {
logger.error("Unsupported conversion of [ {} ] to ", var.getSyntaxString());
var = null;
}
} catch (IllegalArgumentException e) {
logger.error("Unsupported conversion of [ {} ] to ", var.getSyntaxString(), e);
var = null;
}
return Optional.ofNullable(var);
}
public static Optional getErrorMessage(final String oid) {
Optional errorMessage = Optional.ofNullable(REPORT_MAP.get(oid));
if (!errorMessage.isPresent() && oid.charAt(oid.length() - 1) == '0') {
final String cutLastOidValue = oid.substring(0, oid.length() - 2);
errorMessage = Optional.ofNullable(REPORT_MAP.get(cutLastOidValue));
}
return errorMessage.map(s -> oid + ": " + s);
}
public static int getVersion(final String snmpVersion) {
return Optional.ofNullable(VERSION_MAP.get(snmpVersion))
.orElseThrow(() -> new InvalidSnmpVersionException("Invalid SNMP version provided."));
}
}
