def sendVarBinds(self, snmpEngine, targetName, contextEngineId, contextName, nonRepeaters, maxRepetitions, varBinds, cbFun, cbCtx=None): reqPDU = v2c.GetBulkRequestPDU() v2c.apiBulkPDU.setDefaults(reqPDU) v2c.apiBulkPDU.setNonRepeaters(reqPDU, nonRepeaters) v2c.apiBulkPDU.setMaxRepetitions(reqPDU, maxRepetitions) v2c.apiBulkPDU.setVarBinds(reqPDU, varBinds) return self.sendPdu(snmpEngine, targetName, contextEngineId, contextName, reqPDU, self.processResponseVarBinds, (targetName, nonRepeaters, maxRepetitions, contextEngineId, contextName, reqPDU, cbFun, cbCtx))
def sendReq(self, snmpEngine, addrName, nonRepeaters, maxRepetitions, varBinds, cbFun, cbCtx=None, contextEngineId=None, contextName=''): (transportDomain, transportAddress, timeout, retryCount, messageProcessingModel, securityModel, securityName, securityLevel) = config.getTargetInfo(snmpEngine, addrName) reqPDU = v2c.GetBulkRequestPDU() v2c.apiBulkPDU.setDefaults(reqPDU) v2c.apiBulkPDU.setNonRepeaters(reqPDU, nonRepeaters) v2c.apiBulkPDU.setMaxRepetitions(reqPDU, maxRepetitions) v2c.apiBulkPDU.setVarBinds(reqPDU, varBinds) sendRequestHandle = getNextHandle() try: self._sendPdu( snmpEngine, transportDomain, transportAddress, messageProcessingModel, securityModel, securityName, securityLevel, contextEngineId, contextName, reqPDU, timeout, retryCount, 0, # retries sendRequestHandle, (self.processResponsePdu, (cbFun, cbCtx))) except StatusInformation: statusInformation = sys.exc_info()[1] debug.logger & debug.flagApp and debug.logger( 'sendReq: sendPduHandle %s: _sendPdu() failed with %r' % (sendRequestHandle, statusInformation)) cbFun(sendRequestHandle, statusInformation['errorIndication'], 0, 0, (), cbCtx) return sendRequestHandle
def SnmpwalkAsync(target_IP=None, oid=None, community='public', walk_timeout=10, mode='ipv4'): """Script to run in the remote device for snmp mib walk. This script can be copied to the remote device eg:wan and can be executed directly using python for snmp mib walk The walk can done for both ipv6 and ipv4 :param target_IP: device IP for mib query :type target_IP: string :param oid: mib query OID :type oid: string :param community: community string for mib query, defaults to public :type community: string, optional :param walk_timeout: snmp walk timeout, defaults to 10 :type walk_timeout: integer, optional :param mode: mib query mode, defaults to ipv4 :type mode: string, optional :return: mib query output :rtype: string """ # SNMP table header headVars = [v2c.ObjectIdentifier((oid))] # Build PDU reqPDU = v2c.GetBulkRequestPDU() v2c.apiBulkPDU.setDefaults(reqPDU) v2c.apiBulkPDU.setNonRepeaters(reqPDU, 0) v2c.apiBulkPDU.setMaxRepetitions(reqPDU, 25) v2c.apiBulkPDU.setVarBinds(reqPDU, [(x, v2c.null) for x in headVars]) # Build message reqMsg = v2c.Message() v2c.apiMessage.setDefaults(reqMsg) v2c.apiMessage.setCommunity(reqMsg, community) v2c.apiMessage.setPDU(reqMsg, reqPDU) startedAt = time.time() output_list = [] def cbTimerFun(timeNow): # Duration if timeNow - startedAt > walk_timeout: if walk_timeout != 0: raise Exception("Request timed out") else: if timeNow - startedAt > 30: transportDispatcher.jobFinished(1) # noinspection PyUnusedLocal def cbRecvFun(transportDispatcher, transportDomain, transportAddress, wholeMsg, reqPDU=reqPDU, headVars=headVars): while wholeMsg: rspMsg, wholeMsg = decoder.decode(wholeMsg, asn1Spec=v2c.Message()) rspPDU = v2c.apiMessage.getPDU(rspMsg) # Match response to request if v2c.apiBulkPDU.getRequestID( reqPDU) == v2c.apiBulkPDU.getRequestID(rspPDU): # Format var-binds table varBindTable = v2c.apiBulkPDU.getVarBindTable(reqPDU, rspPDU) # Check for SNMP errors reported errorStatus = v2c.apiBulkPDU.getErrorStatus(rspPDU) if errorStatus and errorStatus != 2: errorIndex = v2c.apiBulkPDU.getErrorIndex(rspPDU) print('%s at %s' % (errorStatus.prettyPrint(), errorIndex and varBindTable[int(errorIndex) - 1] or '?')) transportDispatcher.jobFinished(1) break # Report SNMP table for tableRow in varBindTable: for name, val in tableRow: # print mib data print('from: %s, %s = %s' % (transportAddress, name.prettyPrint(), val.prettyPrint())) output_list.append( 'from: %s, %s = %s\n' % (transportAddress, name.prettyPrint(), val.prettyPrint())) # Stop on EOM for oid, val in varBindTable[-1]: if not isinstance(val, v2c.Null): break else: transportDispatcher.jobFinished(1) # Generate request for next row v2c.apiBulkPDU.setVarBinds(reqPDU, [(x, v2c.null) for x, y in varBindTable[-1]]) v2c.apiBulkPDU.setRequestID(reqPDU, v2c.getNextRequestID()) transportDispatcher.sendMessage(encoder.encode(reqMsg), transportDomain, transportAddress) return wholeMsg transportDispatcher = AsyncoreDispatcher() transportDispatcher.registerRecvCbFun(cbRecvFun) transportDispatcher.registerTimerCbFun(cbTimerFun) if mode == 'ipv4': transportDispatcher.registerTransport( udp.domainName, udp.UdpSocketTransport().openClientMode()) transportDispatcher.sendMessage(encoder.encode(reqMsg), udp.domainName, (target_IP, 161)) else: transportDispatcher.registerTransport( udp6.domainName, udp6.Udp6SocketTransport().openClientMode()) transportDispatcher.sendMessage(encoder.encode(reqMsg), udp6.domainName, (target_IP, 161)) transportDispatcher.jobStarted(1) # Dispatcher will finish as job#1 counter reaches zero transportDispatcher.runDispatcher() transportDispatcher.closeDispatcher() if output_list != []: return output_list else: return
This script performs similar to the following Net-SNMP command: | $ snmpbulkwalk -v2c -c public -ObentU -Cn0 -Cr25 demo.snmplabs.com 1.3.6 """# from pysnmp.carrier.asyncore.dispatch import AsyncoreDispatcher from pysnmp.carrier.asyncore.dgram import udp from pyasn1.codec.ber import encoder, decoder from pysnmp.proto.api import v2c from time import time # SNMP table header headVars = [v2c.ObjectIdentifier((1, 3, 6))] # Build PDU reqPDU = v2c.GetBulkRequestPDU() v2c.apiBulkPDU.setDefaults(reqPDU) v2c.apiBulkPDU.setNonRepeaters(reqPDU, 0) v2c.apiBulkPDU.setMaxRepetitions(reqPDU, 25) v2c.apiBulkPDU.setVarBinds(reqPDU, [(x, v2c.null) for x in headVars]) # Build message reqMsg = v2c.Message() v2c.apiMessage.setDefaults(reqMsg) v2c.apiMessage.setCommunity(reqMsg, 'public') v2c.apiMessage.setPDU(reqMsg, reqPDU) startedAt = time() def cbTimerFun(timeNow):