public static extern SNMPAPI_STATUS SnmpFreeDescriptor(int syntax, ref SMIOCTETS desc);
public static extern SNMPAPI_STATUS SnmpEncodeMsg(IntPtr session, IntPtr src, IntPtr dest, IntPtr context, IntPtr pdu, ref SMIOCTETS octets);
public static extern IntPtr SnmpStrToContext(IntPtr session, ref SMIOCTETS octets);
public static extern SNMPAPI_STATUS SnmpContextToStr(IntPtr context, ref SMIOCTETS octets);
/// <summary>
/// FUNCTION: Send
/// PURPOSE : To send a pdu in order to set the MIB values
/// </summary>
public bool Send()
{
bool Success = false; // init success to failure
try
{
if (VBLInit)
{
if (Vbl.Item.Count > 0)
{
SNMPAPI_STATUS Result = new SNMPAPI_STATUS(); // set up a result item
// create entities for the source and destination addresses
IntPtr Source = SnmpAPI.SnmpStrToEntity(Session, LocalAddr);
IntPtr Destin = SnmpAPI.SnmpStrToEntity(Session, RemoteAddr);
// create arrays to hold Variable Info
SMIOID[] OID = new SMIOID[Vbl.Item.Count]; // an array of oids
SMIVALUE[] Val = new SMIVALUE[Vbl.Item.Count]; // an array of values
SMIOCTETS[] Oct = new SMIOCTETS[Vbl.Item.Count]; // an array of octets
SMIOCTETS DestOct = new SMIOCTETS(); // the destination octect
GCHandle[] PinnedArray = new GCHandle[Vbl.Item.Count]; // an array of pinned memory
byte[][] ba = new byte[Vbl.Item.Count][]; // a multi-dimensional byte array
IntPtr VbL1 = new IntPtr(); // pointer to variable bindings list
IntPtr Context = new IntPtr(); // pointer to a context object
// start looping through all items in the variable bindings list
for (int i = 0; i < Vbl.Item.Count; i++)
{
ba[i] = new byte[((VARIABLE_ITEM)Vbl.Item[i]).Value.Length]; // new byte array
// check to see if the user has passed the separator
if (Vbl.ParentEntity.Substring(Vbl.ParentEntity.Length - 1, 1) != "." &&
((VARIABLE_ITEM)Vbl.Item[i]).Entity.Substring(0, 1) != ".")
{
Result = SnmpAPI.SnmpStrToOid(Vbl.ParentEntity + "." + ((VARIABLE_ITEM)Vbl.Item[i]).Entity, ref OID[i]);
}
else
{
Result = SnmpAPI.SnmpStrToOid(Vbl.ParentEntity + ((VARIABLE_ITEM)Vbl.Item[i]).Entity, ref OID[i]);
}
// check result
if (Result == SNMPAPI_STATUS.SNMPAPI_FAILURE)
{
throw new Exception("SNMP OID Creation Failure");
}
// create the octet and value for this variable
Oct[i].size = (uint)((VARIABLE_ITEM)Vbl.Item[i]).Value.Length; // set the octet size
ba[i] = Encoding.ASCII.GetBytes(((VARIABLE_ITEM)Vbl.Item[i]).Value); // encode string to byte array
PinnedArray[i] = GCHandle.Alloc(ba[i], GCHandleType.Pinned); // this creates a static memory location
Oct[i].octets = PinnedArray[i].AddrOfPinnedObject(); // set the octet pointer
// now, check what type of variable this is and set the value accordingly
switch (((VARIABLE_ITEM)Vbl.Item[i]).Type)
{
case VARIABLE_TYPE.VARIABLE_TYPE_INT:
Val[i].type = SNMPAPI_SYNTAX.SNMP_SYNTAX_INT;
Val[i].val.sNumber = int.Parse(((VARIABLE_ITEM)Vbl.Item[i]).Value);
break;
case VARIABLE_TYPE.VARIABLE_TYPE_INT32:
Val[i].type = SNMPAPI_SYNTAX.SNMP_SYNTAX_INT32;
Val[i].val.hNumber = long.Parse(((VARIABLE_ITEM)Vbl.Item[i]).Value);
break;
case VARIABLE_TYPE.VARIABLE_TYPE_OCTECT:
Val[i].type = SNMPAPI_SYNTAX.SNMP_SYNTAX_OCTETS;
Val[i].val.str = Oct[i];
break;
}
// check to see if this is the first item, or an item to append
if (i == 0)
{
VbL1 = SnmpAPI.SnmpCreateVbl(Session, ref OID[i], ref Val[i]);
}
else
{
Result = SnmpAPI.SnmpSetVb(VbL1, 0, ref OID[i], ref Val[i]);
}
}
// now, set up the protocol description unit
IntPtr Pdu = SnmpAPI.SnmpCreatePdu(Session, (int)SNMPAPI_PDU.SNMP_PDU_SET, Vbl.RequestID, 0, 0, VbL1);
// set the destination octet (we only need to set the first one, the rest will flow accordingly)
DestOct.size = (uint)((VARIABLE_ITEM)Vbl.Item[0]).Value.Length;
DestOct.octets = PinnedArray[0].AddrOfPinnedObject();
Context = SnmpAPI.SnmpStrToContext(Session, ref DestOct);
// set the port to 162
Result = SnmpAPI.SnmpSetPort(Destin, 162);
// now send the messages
Result = SnmpAPI.SnmpSendMsg(Session, Source, Destin, Context, Pdu);
// SNMPAPI use requires us to handle some garbage collecting ourselves, else suffer memory leakage.
// free the context
Result = SnmpAPI.SnmpFreeContext(Context);
// free the pdu
Result = SnmpAPI.SnmpFreePdu(Pdu);
// free the variable lists
SnmpAPI.SnmpFreeVbl(VbL1);
for (int t = 0; t < Vbl.Item.Count; t++)
{
// free the pinned arrays
PinnedArray[t].Free();
// free the oids
SnmpAPI.SnmpFreeDescriptor((int)SNMPAPI_SYNTAX.SNMP_SYNTAX_OID, ref OID[t]);
}
// finally, free the entities
SnmpAPI.SnmpFreeEntity(Source);
SnmpAPI.SnmpFreeEntity(Destin);
Success = true;
}
else
{
throw new Exception("Variable Binding List Empty.");
}
}
else
{
throw new Exception("Variable Binding Does Not Exist.");
}
}
catch (Exception Err)
{
ErrMess = Err.Message;
}
return(Success); // return success flag
}
public bool Listen(string RemoteMachine)
{
bool Success = false; // init success to failure
try
{
SNMPAPI_STATUS Result = new SNMPAPI_STATUS(); // set up a result item
// this is our call-back function
SnmpAPI.SnmpCallback SnmpCB1 = new SnmpAPI.SnmpCallback(OnSnmpMessage);
// get the local and remote ip addresses
this.LocalAddr = Dns.GetHostEntry(Dns.GetHostName()).AddressList[0].ToString();
this.RemoteAddr = Dns.GetHostEntry(RemoteMachine).AddressList[0].ToString();
// initialize the snmp api system
Result = SnmpAPI.SnmpStartup(out major, out minor, out level, out translate, out retran);
if (Result != SNMPAPI_STATUS.SNMPAPI_SUCCESS)
{
throw new Exception("SNMP Initialization Error");
}
// create the session
Session = SnmpAPI.SnmpCreateSession(IntPtr.Zero, 0, SnmpCB1, IntPtr.Zero);
if (Result == SNMPAPI_STATUS.SNMPAPI_FAILURE)
{
throw new Exception("SNMP Create Session Error");
}
Result = SnmpRegister(Session, System.IntPtr.Zero, System.IntPtr.Zero, System.IntPtr.Zero, System.IntPtr.Zero, (int)SNMPAPI_STATE.SNMPAPI_ON);
if (Result != SNMPAPI_STATUS.SNMPAPI_SUCCESS)
{
throw new Exception("SNMP Initialization Error");
}
IntPtr VbL1 = new IntPtr(); // pointer to variable bindings list
SMIOID[] OID = new SMIOID[1]; // an array of oids
SMIVALUE[] Val = new SMIVALUE[1]; // an array of values
// create entities for the source and destination addresses
IntPtr Source = SnmpAPI.SnmpStrToEntity(Session, LocalAddr);
IntPtr Destin = SnmpAPI.SnmpStrToEntity(Session, RemoteAddr);
VbL1 = SnmpAPI.SnmpCreateVbl(Session, ref OID[0], ref Val[0]);
VARIABLE_ITEM VariableListItem = new VARIABLE_ITEM();
VariableListItem.Entity = ".1";
VariableListItem.Type = VARIABLE_TYPE.VARIABLE_TYPE_OCTECT;
VariableListItem.Value = "GetAlarmDescription(AlarmCode)";
AddVariableListItem(VariableListItem);
IntPtr Pdu = SnmpAPI.SnmpCreatePdu(Session, (int)SNMPAPI_PDU.SNMP_PDU_GETBULK, Int16.MinValue, Int16.MinValue, Int16.MinValue, VbL1);
GCHandle[] PinnedArray = new GCHandle[1]; // an array of pinned memory
SMIOCTETS DestOct = new SMIOCTETS(); // the destination octect
// set the destination octet (we only need to set the first one, the rest will flow accordingly)
DestOct.size = (uint)(VariableListItem.Value.Length);
//DestOct.octets = PinnedArray[0].AddrOfPinnedObject();
IntPtr Context = SnmpAPI.SnmpStrToContext(Session, ref DestOct);
// set the port to 162
Result = SnmpAPI.SnmpSetPort(Destin, 162);
while (!Success)
{
Result = SnmpAPI.SnmpRecvMsg(Session, out Source, out Destin, out Context, out Pdu);
if (Result == SNMPAPI_STATUS.SNMPAPI_SUCCESS)
//throw new Exception("SNMP Initialization Error");
{
int teste1;
int teste0;
int teste3; int teste4;
IntPtr vlb;
Result = SnmpAPI.SnmpGetPduData(Pdu, out teste0, out teste1, out teste3, out teste4, out vlb);
//VARIABLE_BINDING_LIST teste11 = teste;
Success = true;
break;
}
Thread.Sleep(100);
}
}
catch (Exception Err)
{
ErrMess = Err.Message;
}
return(Success);
}
