# SNMPAgent Class

The SNMPAgent class is used to implement UDP-based SNMP Agent Applications.

## Syntax

```text
SNMPAgent
```

## Remarks

The SNMPAgent class implements a UDP-based standard SNMP Agent as specified in the SNMP RFCs. The class supports SNMP v1, v2c, and v3.

SNMP over DTLS is also supported when [SSLEnabled](#sslenabled-property-snmpagent-class) is set to True. When acting as a client, the [SSLServerAuthentication](#sslserverauthentication-event-snmpagent-class) event allows you to check the server identity and other security attributes. The [SSLStatus](#sslstatus-event-snmpagent-class) event provides information about the DTLS handshake. Additional SSL-related settings are also supported through the [Config](#config-method-snmpagent-class) method. When acting as a server, the **SSLCert** properties are used to select a certificate for the server. When client authentication is required, the [SSLAuthenticateClients](#sslauthenticateclients-property-snmpagent-class) property can be set to True and the [SSLClientAuthentication](#sslclientauthentication-event-snmpagent-class) event can be used to examine client credentials.

The class provides both encoding/decoding and transport capabilities, making the task of developing a custom SNMP agent as simple as setting a few key properties and handling a few events. SNMP data such as SNMP object id-s (OID-s) are exchanged as text strings, thus further simplifying the task of handling them.

The class is activated/deactivated by calling the [Activate](#activate-method-snmpagent-class) or [Deactivate](#deactivate-method-snmpagent-class) method. These methods enable or disable sending and receiving. The activation status can be found in the [Active](#active-property-snmpagent-class) property.

The class operates asynchronously. Requests are received through events such as [GetRequest](#getrequest-event-snmpagent-class), [GetBulkRequest](#getbulkrequest-event-snmpagent-class), [GetNextRequest](#getnextrequest-event-snmpagent-class), etc. and the corresponding responses are automatically sent when the events return. Traps are sent through the [SendTrap](#sendtrap-method-snmpagent-class) method.

SNMPv3 USM security passwords are requested through the [GetUserPassword](#getuserpassword-event-snmpagent-class) event, and event parameters such as *User* and *SecurityLevel* provide information about the security attributes of received requests, and enable granular decision capability about what to provide and what not to provide. The [SendSecureTrap](#sendsecuretrap-method-snmpagent-class) method is used to send authenticated (secure) SNMPv3 traps.

The [AddUser](#adduser-method-snmpagent-class), [RemoveUser](#removeuser-method-snmpagent-class), [ShowCache](#showcache-method-snmpagent-class), and [ClearCache](#clearcache-method-snmpagent-class) methods are used to manage an internal authentication cache. This internal cache can be used as an alternative to the [GetUserPassword](#getuserpassword-event-snmpagent-class) event, automatically checking the cache against the security parameters provided in the request signature.

SNMP OIDs, types, and values are provided in the [Objects](#objects-property-snmpagent-class) collection of SNMP objects for both sent and received packets.

Other packet information is provided through corresponding event parameters, such as Community, or RequestId.

## Property List

*The following is the full list of the properties of the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [AcceptData](#acceptdata-property-snmpagent-class) | Enables or disables data reception. |
| [Active](#active-property-snmpagent-class) | Indicates whether the class is active. |
| [LocalEngineId](#localengineid-property-snmpagent-class) | The Engine Id of the SNMP Agent. |
| [LocalHost](#localhost-property-snmpagent-class) | The name of the local host or user-assigned IP interface through which connections are initiated or accepted. |
| [LocalPort](#localport-property-snmpagent-class) | The port in the local host where the class listens. |
| [Objects](#objects-property-snmpagent-class) | The objects in the current request. |
| [RequestId](#requestid-property-snmpagent-class) | The request-id to mark outgoing packets with. |
| [SNMPVersion](#snmpversion-property-snmpagent-class) | Version of SNMP used for outgoing requests (traps). |
| [SSLAcceptServerCert](#sslacceptservercert-property-snmpagent-class) | Instructs the class to unconditionally accept the server certificate that matches the supplied certificate. |
| [SSLAuthenticateClients](#sslauthenticateclients-property-snmpagent-class) | If set to True, the server asks the client(s) for a certificate. |
| [SSLCert](#sslcert-property-snmpagent-class) | The certificate to be used during Secure Sockets Layer (SSL) negotiation. |
| [SSLEnabled](#sslenabled-property-snmpagent-class) | Whether DTLS is enabled. |
| [SSLServerCert](#sslservercert-property-snmpagent-class) | The server certificate for the last established connection. |
| [SysUpTime](#sysuptime-property-snmpagent-class) | Time passed since the agent was initialized (in hundredths of a second). |

## Method List

*The following is the full list of the methods of the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [Activate](#activate-method-snmpagent-class) | Activates the class. |
| [AddUser](#adduser-method-snmpagent-class) | Adds a user to the internal authentication cache. |
| [ClearCache](#clearcache-method-snmpagent-class) | Clears the internal authentication database. |
| [Config](#config-method-snmpagent-class) | Sets or retrieves a configuration setting. |
| [Deactivate](#deactivate-method-snmpagent-class) | Deactivates the class. |
| [DoEvents](#doevents-method-snmpagent-class) | This method processes events from the internal message queue. |
| [HashPasswords](#hashpasswords-method-snmpagent-class) | Hashes all passwords in the cache. |
| [PauseData](#pausedata-method-snmpagent-class) | This method pauses data reception. |
| [ProcessData](#processdata-method-snmpagent-class) | This method reenables data reception after a call to PauseData . |
| [RemoveUser](#removeuser-method-snmpagent-class) | Removes the user specified by User from the internal authentication cache. |
| [Reset](#reset-method-snmpagent-class) | Clears the object arrays. |
| [SendResponse](#sendresponse-method-snmpagent-class) | Sends a response packet to a Get, Get-Next, Get-Bulk, or Set request. |
| [SendSecureResponse](#sendsecureresponse-method-snmpagent-class) | Sends an authenticated and/or encrypted SNMPv3 response. |
| [SendSecureTrap](#sendsecuretrap-method-snmpagent-class) | Sends an authenticated and/or encrypted SNMPv3 trap. |
| [SendTrap](#sendtrap-method-snmpagent-class) | Sends an SNMP Trap. |
| [ShowCache](#showcache-method-snmpagent-class) | Lists all entries in the internal user authentication cache. |
| [Value](#value-method-snmpagent-class) | Returns the value corresponding to an OID. |

## Event List

*The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [BadPacket](#badpacket-event-snmpagent-class) | Fired for erroneous and/or malformed messages. |
| [CacheEntry](#cacheentry-event-snmpagent-class) | Shows in the internal cache. |
| [Connected](#connected-event-snmpagent-class) | Fired immediately after a connection completes (or fails). |
| [Disconnected](#disconnected-event-snmpagent-class) | Fired when a connection is closed. |
| [DiscoveryRequest](#discoveryrequest-event-snmpagent-class) | Fired when an SNMPv3 discovery packet is received. |
| [Error](#error-event-snmpagent-class) | Fired when information is available about errors during data delivery. |
| [GetBulkRequest](#getbulkrequest-event-snmpagent-class) | Fired when a GetBulkRequest packet is received. |
| [GetNextRequest](#getnextrequest-event-snmpagent-class) | Fired when a GetNextRequest packet is received. |
| [GetRequest](#getrequest-event-snmpagent-class) | Fired when a GetRequest packet is received. |
| [GetUserPassword](#getuserpassword-event-snmpagent-class) | Retrieves a password associated with a user. |
| [GetUserSecurityLevel](#getusersecuritylevel-event-snmpagent-class) | Sets the security level for an incoming packet. |
| [HashPassword](#hashpassword-event-snmpagent-class) | Fired before and after a password is hashed. |
| [PacketTrace](#packettrace-event-snmpagent-class) | Fired for every packet sent or received. |
| [ReadyToSend](#readytosend-event-snmpagent-class) | Fired when the class is ready to send data. |
| [Report](#report-event-snmpagent-class) | Fired when a Report packet is received. |
| [SetRequest](#setrequest-event-snmpagent-class) | Fired when a SetRequest packet is received. |
| [SSLClientAuthentication](#sslclientauthentication-event-snmpagent-class) | Fired when the client presents its credentials to the server. |
| [SSLServerAuthentication](#sslserverauthentication-event-snmpagent-class) | Fires when connecting to the server. |
| [SSLStatus](#sslstatus-event-snmpagent-class) | Shows the progress of the secure connection. |

## Config Settings

*The following is a list of config settings for the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [AuthenticationKey](#AuthenticationKey) | The key to use for authentication. |
| [CompatibilityMode](#CompatibilityMode) | Whether to operate the class in a specific compatibility mode. |
| [ContextEngineId](#ContextEngineId) | Sets the context engine id of the SNMP entity. |
| [ContextName](#ContextName) | Sets the context name of the SNMP entity. |
| [DataToSend](#DataToSend) | Sends a raw packet. |
| [DecryptLogPackets](#DecryptLogPackets) | Whether to decrypt logged packets. |
| [EncryptionKey](#EncryptionKey) | The key to use for encryption. |
| [ForceLocalPort](#ForceLocalPort) | Forces the class to bind to a specific port. |
| [IgnoreDiscoveryRequestType](#IgnoreDiscoveryRequestType) | Treats other request types as discovery requests. |
| [IncomingContextEngineId](#IncomingContextEngineId) | The engine Id of the received packet. |
| [IncomingContextName](#IncomingContextName) | The context name of the received packet. |
| [MsgMaxSize](#MsgMaxSize) | The maximum supported message size. |
| [RespondFromDestIP](#RespondFromDestIP) | Whether to respond from the IP address that the request was sent to. |
| [SourceAddress](#SourceAddress) | The source address of the received packet. |
| [SourcePort](#SourcePort) | The source port of the received packet. |
| [TimeWindow](#TimeWindow) | The time window used for SNMPv3 timeliness checking (authentication). |
| [TrapAgentAddress](#TrapAgentAddress) | The address of the object generating the trap. |
| [TrapCommunity](#TrapCommunity) | The value of the Community parameter for SNMP traps. |
| [TrapEnterprise](#TrapEnterprise) | The type of the object generating the trap. |
| [TrapPort](#TrapPort) | The port where SNMP traps are sent. |
| [CaptureIPPacketInfo](#CaptureIPPacketInfo) | Used to capture the packet information. |
| [DelayHostResolution](#DelayHostResolution) | Whether the hostname is resolved when RemoteHost is set. |
| [DestinationAddress](#DestinationAddress) | Used to get the destination address from the packet information. |
| [DontFragment](#DontFragment) | Used to set the Don't Fragment flag of outgoing packets. |
| [LocalHost](#LocalHost) | The name of the local host through which connections are initiated or accepted. |
| [LocalPort](#LocalPort) | The port in the local host where the class binds. |
| [MaxPacketSize](#MaxPacketSize) | The maximum length of the packets that can be received. |
| [QOSDSCPValue](#QOSDSCPValue) | Used to specify an arbitrary QOS/DSCP setting (optional). |
| [QOSTrafficType](#QOSTrafficType) | Used to specify QOS/DSCP settings (optional). |
| [ShareLocalPort](#ShareLocalPort) | If set to True, allows more than one instance of the class to be active on the same local port. |
| [SourceIPAddress](#SourceIPAddress) | Used to set the source IP address used when sending a packet. |
| [SourceMacAddress](#SourceMacAddress) | Used to set the source MAC address used when sending a packet. |
| [UseConnection](#UseConnection) | Determines whether to use a connected socket. |
| [UseIPv6](#UseIPv6) | Whether or not to use IPv6. |
| [AbsoluteTimeout](#AbsoluteTimeout) | Determines whether timeouts are inactivity timeouts or absolute timeouts. |
| [FirewallData](#FirewallData) | Used to send extra data to the firewall. |
| [InBufferSize](#InBufferSize) | The size in bytes of the incoming queue of the socket. |
| [OutBufferSize](#OutBufferSize) | The size in bytes of the outgoing queue of the socket. |
| [BuildInfo](#BuildInfo) | Information about the product's build. |
| [CodePage](#CodePage) | The system code page used for Unicode to Multibyte translations. |
| [LicenseInfo](#LicenseInfo) | Information about the current license. |
| [MaskSensitiveData](#MaskSensitiveData) | Whether sensitive data is masked in log messages. |
| [ProcessIdleEvents](#ProcessIdleEvents) | Whether the class uses its internal event loop to process events when the main thread is idle. |
| [SelectWaitMillis](#SelectWaitMillis) | The length of time in milliseconds the class will wait when DoEvents is called if there are no events to process. |
| [UseInternalSecurityAPI](#UseInternalSecurityAPI) | Whether or not to use the system security libraries or an internal implementation. |

# AcceptData Property ([SNMPAgent](#snmpagent-class) Class)

Enables or disables data reception.

## Syntax

```text
ANSI (Cross Platform)
int GetAcceptData();

Unicode (Windows)
BOOL GetAcceptData();
```

## Default Value

TRUE

## Remarks

Setting the property to False temporarily disables data reception. Setting the property to True re-enables data reception.

This property is read-only and not available at design time.

## Data Type

Boolean

# Active Property ([SNMPAgent](#snmpagent-class) Class)

Indicates whether the class is active.

## Syntax

```text
ANSI (Cross Platform)
int GetActive();

Unicode (Windows)
BOOL GetActive();
```

## Default Value

FALSE

## Remarks

This property indicates whether the class is currently active and can send or receive data.

The class will be automatically activated if it is not already and you attempt to perform an operation which requires the class to be active.

Use the [Activate](#activate-method-snmpagent-class) and [Deactivate](#deactivate-method-snmpagent-class) methods to control whether the class is active.

This property is read-only and not available at design time.

## Data Type

Boolean

# LocalEngineId Property ([SNMPAgent](#snmpagent-class) Class)

The Engine Id of the SNMP Agent.

## Syntax

```text
ANSI (Cross Platform)
int GetLocalEngineId(char* &lpLocalEngineId, int &lenLocalEngineId);int SetLocalEngineId(const char* lpLocalEngineId, int lenLocalEngineId);

Unicode (Windows)
INT GetLocalEngineId(LPSTR &lpLocalEngineId, INT &lenLocalEngineId);INT SetLocalEngineId(LPCSTR lpLocalEngineId, INT lenLocalEngineId);
```

## Default Value

""

## Remarks

This property is only used for SNMPv3 packets (when [SNMPVersion](#snmpversion-property-snmpagent-class) is 3).

## Data Type

Binary String

# LocalHost Property ([SNMPAgent](#snmpagent-class) Class)

The name of the local host or user-assigned IP interface through which connections are initiated or accepted.

## Syntax

```text
ANSI (Cross Platform)
char* GetLocalHost();int SetLocalHost(const char* lpszLocalHost);

Unicode (Windows)
LPWSTR GetLocalHost();INT SetLocalHost(LPCWSTR lpszLocalHost);
```

## Default Value

""

## Remarks

This property contains the name of the local host as obtained by the *gethostname()* system call, or if the user has assigned an IP address, the value of that address.

In multihomed hosts (machines with more than one IP interface) setting LocalHost to the IP address of an interface will make the class initiate connections (or accept in the case of server classes) only through that interface. It is recommended to provide an IP address rather than a hostname when setting this property to ensure the desired interface is used.

If the class is connected, the LocalHost property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multihomed hosts (machines with more than one IP interface).

NOTE: LocalHost is not persistent. You must always set it in code, and never in the property window.

## Data Type

String

# LocalPort Property ([SNMPAgent](#snmpagent-class) Class)

The port in the local host where the class listens.

## Syntax

```text
ANSI (Cross Platform)
int GetLocalPort();int SetLocalPort(int iLocalPort);

Unicode (Windows)
INT GetLocalPort();INT SetLocalPort(INT iLocalPort);
```

## Default Value

161

## Remarks

The LocalPort property must be set before the class is activated ([Active](#active-property-snmpagent-class) is set to True). It instructs the class to bind to a specific port (or communication endpoint) in the local machine (default 161).

You may also set LocalPort to 0. This allows the TCP/IP stack to choose a port at random. The value chosen is provided via the LocalPort property after the class is activated through the [Active](#active-property-snmpagent-class) property.

LocalPort cannot be changed once the class is [Active](#active-property-snmpagent-class). Any attempt to set the LocalPort property when the class is [Active](#active-property-snmpagent-class) will generate an error.

NOTE: on macOS and iOS, root permissions are required to set LocalPort to any value below 1024.

## Data Type

Integer

# Objects Property ([SNMPAgent](#snmpagent-class) Class)

The objects in the current request.

## Syntax

```text
IPWorksSNMPList<IPWorksSNMPSNMPObject>* GetObjects();
int SetObjects(IPWorksSNMPList<IPWorksSNMPSNMPObject>* val);
```

## Remarks

The SNMP objects being sent or received in the current request. The collection is first cleared, then populated every time an SNMP packet is received. It is also used to create outgoing SNMP packets.

## Data Type

[IPWorksSNMPSNMPObject](#snmpobject-type)

# RequestId Property ([SNMPAgent](#snmpagent-class) Class)

The request-id to mark outgoing packets with.

## Syntax

```text
ANSI (Cross Platform)
int GetRequestId();int SetRequestId(int iRequestId);

Unicode (Windows)
INT GetRequestId();INT SetRequestId(INT iRequestId);
```

## Default Value

1

## Remarks

If a custom value is needed for RequestId, the property must be set before sending the request. The class increments RequestId automatically after sending each packet.

This property is not available at design time.

## Data Type

Integer

# SNMPVersion Property ([SNMPAgent](#snmpagent-class) Class)

Version of SNMP used for outgoing requests (traps).

## Syntax

```text
ANSI (Cross Platform)
int GetSNMPVersion();int SetSNMPVersion(int iSNMPVersion);

Unicode (Windows)
INT GetSNMPVersion();INT SetSNMPVersion(INT iSNMPVersion);
```

## Possible Values

```text
SNMPVER_V1(1), SNMPVER_V2C(2), SNMPVER_V3(3)
```

## Default Value

2

## Remarks

This property takes one of the following values:

|  |  |
| --- | --- |
| snmpverV1 (1) | SNMP Version 1. |
| snmpverV2c (2) | SNMP Version 2c. |
| snmpverV3 (3) | SNMP Version 3. |

## Data Type

Integer

# SSLAcceptServerCert Property ([SNMPAgent](#snmpagent-class) Class)

Instructs the class to unconditionally accept the server certificate that matches the supplied certificate.

## Syntax

```text
IPWorksSNMPCertificate* GetSSLAcceptServerCert();
int SetSSLAcceptServerCert(IPWorksSNMPCertificate* val);
```

## Remarks

If it finds any issues with the certificate presented by the server, the class will normally terminate the connection with an error.

You may override this behavior by supplying a value for SSLAcceptServerCert. If the certificate supplied in SSLAcceptServerCert is the same as the certificate presented by the server, then the server certificate is accepted unconditionally, and the connection will continue normally.

NOTE: This functionality is provided only for cases in which you otherwise know that you are communicating with the right server. If used improperly, this property may create a security breach. Use it at your own risk.

## Data Type

[IPWorksSNMPCertificate](#certificate-type)

# SSLAuthenticateClients Property ([SNMPAgent](#snmpagent-class) Class)

If set to True, the server asks the client(s) for a certificate.

## Syntax

```text
ANSI (Cross Platform)
int GetSSLAuthenticateClients();int SetSSLAuthenticateClients(int bSSLAuthenticateClients);

Unicode (Windows)
BOOL GetSSLAuthenticateClients();INT SetSSLAuthenticateClients(BOOL bSSLAuthenticateClients);
```

## Default Value

FALSE

## Remarks

This property is used in conjunction with the [SSLClientAuthentication](#sslclientauthentication-event-snmpagent-class) event. Please refer to the documentation of the [SSLClientAuthentication](#sslclientauthentication-event-snmpagent-class) event for details.

## Data Type

Boolean

# SSLCert Property ([SNMPAgent](#snmpagent-class) Class)

The certificate to be used during Secure Sockets Layer (SSL) negotiation.

## Syntax

```text
IPWorksSNMPCertificate* GetSSLCert();
int SetSSLCert(IPWorksSNMPCertificate* val);
```

## Remarks

This property includes the digital certificate that the class will use during SSL negotiation. Set this property to a valid certificate before starting SSL negotiation. To set a certificate, you may set the [Encoded](#Certificate_f_Encoded) field to the encoded certificate. To select a certificate, use the store and subject fields.

## Data Type

[IPWorksSNMPCertificate](#certificate-type)

# SSLEnabled Property ([SNMPAgent](#snmpagent-class) Class)

Whether DTLS is enabled.

## Syntax

```text
ANSI (Cross Platform)
int GetSSLEnabled();int SetSSLEnabled(int bSSLEnabled);

Unicode (Windows)
BOOL GetSSLEnabled();INT SetSSLEnabled(BOOL bSSLEnabled);
```

## Default Value

FALSE

## Remarks

This setting specifies whether DTLS is enabled in the class. When False (default) the class operates in plaintext mode. When True DTLS is enabled.

This property is not available at design time.

## Data Type

Boolean

# SSLServerCert Property ([SNMPAgent](#snmpagent-class) Class)

The server certificate for the last established connection.

## Syntax

```text
IPWorksSNMPCertificate* GetSSLServerCert();
```

## Remarks

This property contains the server certificate for the last established connection.

SSLServerCert is reset every time a new connection is attempted.

This property is read-only.

## Data Type

[IPWorksSNMPCertificate](#certificate-type)

# SysUpTime Property ([SNMPAgent](#snmpagent-class) Class)

Time passed since the agent was initialized (in hundredths of a second).

## Syntax

```text
ANSI (Cross Platform)
int64 GetSysUpTime();int SetSysUpTime(int64 lSysUpTime);

Unicode (Windows)
LONG64 GetSysUpTime();INT SetSysUpTime(LONG64 lSysUpTime);
```

## Default Value

0

## Remarks

This property is used when sending SNMP traps, and it normally provides the time since the system was restarted in 1/100s of a second.

If another value is desired, you may set this property to a custom value. From that point on, SysUpTime will return the value set plus time elapsed.

This property is not available at design time.

## Data Type

Long64

# Activate Method ([SNMPAgent](#snmpagent-class) Class)

Activates the class.

## Syntax

```text
ANSI (Cross Platform)
int Activate();

Unicode (Windows)
INT Activate();
```

## Remarks

This method activates the component and will allow it to send or receive data.

The class will be automatically activated if it is not already and you attempt to perform an operation which requires the class to be active.

NOTE: Use the [Active](#active-property-snmpagent-class) property to check whether the component is active.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# AddUser Method ([SNMPAgent](#snmpagent-class) Class)

Adds a user to the internal authentication cache.

## Syntax

```text
ANSI (Cross Platform)
int AddUser(const char* lpszUser, int iAuthenticationProtocol, const char* lpszAuthenticationPassword, int iEncryptionAlgorithm, const char* lpszEncryptionPassword);

Unicode (Windows)
INT AddUser(LPCWSTR lpszUser, INT iAuthenticationProtocol, LPCWSTR lpszAuthenticationPassword, INT iEncryptionAlgorithm, LPCWSTR lpszEncryptionPassword);
```

## Remarks

The internal authentication cache can be used as an alternative to the [GetUserPassword](#getuserpassword-event-snmpagent-class) event, automatically checking the cache against the security parameters provided in the request signature.

The [ShowCache](#showcache-method-snmpagent-class) method is used to show the contents of the internal authentication cache.

The [ClearCache](#clearcache-method-snmpagent-class) method can be used to completely clear the cache.

Valid Authentication Protocols are:

|  |  |
| --- | --- |
| HMAC-MD5-96 (1) | Message-Digest algorithm 5. |
| HMAC-SHA-96 (2) | Secure Hash Algorithm. |
| HMAC-192-SHA-256 (3) | Secure Hash Algorithm. |
| HMAC-384-SHA-512 (4) | Secure Hash Algorithm. |
| HMAC-128-SHA-224 (5) | Secure Hash Algorithm. |
| HMAC-256-SHA-384 (6) | Secure Hash Algorithm. |

Valid Encryption Algorithms are:

|  |  |
| --- | --- |
| DES (1) | Data Encryption Standard. |
| AES (2) | Advanced Encryption Standard with key length of 128. |
| 3DES (3) | Triple Data Encryption Standard. |
| AES192 (4) | Advanced Encryption Standard with key length of 192. |
| AES256 (5) | Advanced Encryption Standard with key length of 256. |

NOTE: Specifying an authentication protocol of 0 is a special case where the class will attempt to verify users with all valid authentication protocols.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# ClearCache Method ([SNMPAgent](#snmpagent-class) Class)

Clears the internal authentication database.

## Syntax

```text
ANSI (Cross Platform)
int ClearCache();

Unicode (Windows)
INT ClearCache();
```

## Remarks

All user records are removed from the internal authentication cache as a result of this call.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# Config Method ([SNMPAgent](#snmpagent-class) Class)

Sets or retrieves a configuration setting.

## Syntax

```text
ANSI (Cross Platform)
char* Config(const char* lpszConfigurationString);

Unicode (Windows)
LPWSTR Config(LPCWSTR lpszConfigurationString);
```

## Remarks

Config is a generic method available in every class. It is used to set and retrieve [configuration settings](#config-settings-snmpagent-class) for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these *internal properties* is provided through the Config method.

To set a configuration setting named *PROPERTY*, you must call *Config("PROPERTY=VALUE")*, where *VALUE* is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a [configuration setting](#config-settings-snmpagent-class), you must call *Config("PROPERTY")*. The value will be returned as a string.

## Error Handling (C++)

This method returns a String value; after it returns, call the *GetLastErrorCode()* method to obtain its result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message.

# Deactivate Method ([SNMPAgent](#snmpagent-class) Class)

Deactivates the class.

## Syntax

```text
ANSI (Cross Platform)
int Deactivate();

Unicode (Windows)
INT Deactivate();
```

## Remarks

This method deactivates the component and will prohibit it from sending and receiving data.

NOTE: Use the [Active](#active-property-snmpagent-class) property to check whether the component is active.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# DoEvents Method ([SNMPAgent](#snmpagent-class) Class)

This method processes events from the internal message queue.

## Syntax

```text
ANSI (Cross Platform)
int DoEvents();

Unicode (Windows)
INT DoEvents();
```

## Remarks

When DoEvents is called, the class processes any available events. If no events are available, it waits for a preset period of time, and then returns.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# HashPasswords Method ([SNMPAgent](#snmpagent-class) Class)

Hashes all passwords in the cache.

## Syntax

```text
ANSI (Cross Platform)
int HashPasswords();

Unicode (Windows)
INT HashPasswords();
```

## Remarks

Forces computation of all passwords hashes in the cache. Used together with the [HashPassword](#hashpassword-event-snmpagent-class) event to enable implementations of external password hash storage.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# PauseData Method ([SNMPAgent](#snmpagent-class) Class)

This method pauses data reception.

## Syntax

```text
ANSI (Cross Platform)
int PauseData();

Unicode (Windows)
INT PauseData();
```

## Remarks

This method pauses data reception when called. While data reception is paused, the DataIn event will not fire. Call [ProcessData](#processdata-method-snmpagent-class) to reenable data reception.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# ProcessData Method ([SNMPAgent](#snmpagent-class) Class)

This method reenables data reception after a call to PauseData .

## Syntax

```text
ANSI (Cross Platform)
int ProcessData();

Unicode (Windows)
INT ProcessData();
```

## Remarks

This method reenables data reception after a previous call to [PauseData](#pausedata-method-snmpagent-class). When [PauseData](#pausedata-method-snmpagent-class) is called, the DataIn event will not fire. To reenable data reception and allow DataIn to fire, call this method.

NOTE: This method is used only after previously calling [PauseData](#pausedata-method-snmpagent-class). It does not need to be called to process incoming data by default.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# RemoveUser Method ([SNMPAgent](#snmpagent-class) Class)

Removes the user specified by User from the internal authentication cache.

## Syntax

```text
ANSI (Cross Platform)
int RemoveUser(const char* lpszUser);

Unicode (Windows)
INT RemoveUser(LPCWSTR lpszUser);
```

## Remarks

The internal authentication cache can be used as an alternative to the [GetUserPassword](#getuserpassword-event-snmpagent-class) event, automatically checking the cache against the security parameters provided in the request signature.

The [ShowCache](#showcache-method-snmpagent-class) method is used to show the contents of the internal authentication cache.

The [ClearCache](#clearcache-method-snmpagent-class) method can be used to completely clear the cache.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# Reset Method ([SNMPAgent](#snmpagent-class) Class)

Clears the object arrays.

## Syntax

```text
ANSI (Cross Platform)
int Reset();

Unicode (Windows)
INT Reset();
```

## Remarks

Clears the object arrays, and sets the trap and error properties to their default values. This is useful for reinitializing all the properties that are used to create outgoing packets before building a new packet.

Note: [SNMPVersion](#snmpversion-property-snmpagent-class) will be reset to **snmpverV2c (2)**.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SendResponse Method ([SNMPAgent](#snmpagent-class) Class)

Sends a response packet to a Get, Get-Next, Get-Bulk, or Set request.

## Syntax

```text
ANSI (Cross Platform)
int SendResponse(const char* lpszRemoteHost, int iRemotePort, int iRequestId, const char* lpszCommunity, int iErrorStatus, int iErrorIndex);

Unicode (Windows)
INT SendResponse(LPCWSTR lpszRemoteHost, INT iRemotePort, INT iRequestId, LPCWSTR lpszCommunity, INT iErrorStatus, INT iErrorIndex);
```

## Remarks

Use this method to send asynchronous response packets. A valid *RequestId* must be specified. SendResponse sends an unauthenticated response packet. Depending upon the value of the [SNMPVersion](#snmpversion-property-snmpagent-class) property, the packet is constructed as an SNMPv1, SNMPv2c, or SNMPv3 (unauthenticated) response PDU. To send authenticated or encrypted SNMPv3 responses, use [SendSecureResponse](#sendsecureresponse-method-snmpagent-class)

The *RemoteHost* and *RemotePort* parameters are used to determine where the response is to be sent. The object identifiers, types, and values for the request are taken from the [Objects](#objects-property-snmpagent-class) collection. The *RequestId*, *Community*, *ErrorStatus*, and *ErrorIndex* parameters are used to specify other properties of the response.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SendSecureResponse Method ([SNMPAgent](#snmpagent-class) Class)

Sends an authenticated and/or encrypted SNMPv3 response.

## Syntax

```text
ANSI (Cross Platform)
int SendSecureResponse(const char* lpszRemoteHost, int iRemotePort, int iRequestId, int iMessageId, int iErrorStatus, int iErrorIndex, const char* lpszUser, int iAuthenticationProtocol, const char* lpszAuthenticationPassword, int iEncryptionAlgorithm, const char* lpszEncryptionPassword);

Unicode (Windows)
INT SendSecureResponse(LPCWSTR lpszRemoteHost, INT iRemotePort, INT iRequestId, INT iMessageId, INT iErrorStatus, INT iErrorIndex, LPCWSTR lpszUser, INT iAuthenticationProtocol, LPCWSTR lpszAuthenticationPassword, INT iEncryptionAlgorithm, LPCWSTR lpszEncryptionPassword);
```

## Remarks

Similar to the [SendResponse](#sendresponse-method-snmpagent-class) method except that *User*, *Authentication Protocol*, and *AuthenticationPassword* are used to authenticate the response. *EncryptionAlgorithm* and *EncryptionPassword* (if not empty) are used to encrypt the response.

The MessageId argument must match the *MessageId* parameter obtained from the [GetRequest](#getrequest-event-snmpagent-class), [GetNextRequest](#getnextrequest-event-snmpagent-class), [SetRequest](#setrequest-event-snmpagent-class), or [GetBulkRequest](#getbulkrequest-event-snmpagent-class) event.

The user and password arguments used to send the response will be added to the internal user cache. If the user is already in the cache, its passwords will be updated with those supplied.

Valid Authentication Protocols are:

|  |  |
| --- | --- |
| HMAC-MD5-96 (1) | Message-Digest algorithm 5. |
| HMAC-SHA-96 (2) | Secure Hash Algorithm. |
| HMAC-192-SHA-256 (3) | Secure Hash Algorithm. |
| HMAC-384-SHA-512 (4) | Secure Hash Algorithm. |
| HMAC-128-SHA-224 (5) | Secure Hash Algorithm. |
| HMAC-256-SHA-384 (6) | Secure Hash Algorithm. |

Valid Encryption Algorithms are:

|  |  |
| --- | --- |
| DES (1) | Data Encryption Standard. |
| AES (2) | Advanced Encryption Standard with key length of 128. |
| 3DES (3) | Triple Data Encryption Standard. |
| AES192 (4) | Advanced Encryption Standard with key length of 192. |
| AES256 (5) | Advanced Encryption Standard with key length of 256. |

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SendSecureTrap Method ([SNMPAgent](#snmpagent-class) Class)

Sends an authenticated and/or encrypted SNMPv3 trap.

## Syntax

```text
ANSI (Cross Platform)
int SendSecureTrap(const char* lpszRemoteHost, const char* lpszTrapOID, const char* lpszUser, int iAuthenticationProtocol, const char* lpszAuthenticationPassword, int iEncryptionAlgorithm, const char* lpszEncryptionPassword);

Unicode (Windows)
INT SendSecureTrap(LPCWSTR lpszRemoteHost, LPCWSTR lpszTrapOID, LPCWSTR lpszUser, INT iAuthenticationProtocol, LPCWSTR lpszAuthenticationPassword, INT iEncryptionAlgorithm, LPCWSTR lpszEncryptionPassword);
```

## Remarks

Similar to the [SendTrap](#sendtrap-method-snmpagent-class) method except that *User*, *AuthenticationPassword*, and *Authentication Protocol* are used to authenticate the trap. *EncryptionPassword* (if not empty) and *EncryptionAlgorithm* are used to encrypt the message.

The user and password arguments used to send the trap will be added to the internal user cache. If the user is already in the cache, its passwords will be updated with those supplied.

Valid Authentication Protocols are:

|  |  |
| --- | --- |
| HMAC-MD5-96 (1) | Message-Digest algorithm 5. |
| HMAC-SHA-96 (2) | Secure Hash Algorithm. |
| HMAC-192-SHA-256 (3) | Secure Hash Algorithm. |
| HMAC-384-SHA-512 (4) | Secure Hash Algorithm. |
| HMAC-128-SHA-224 (5) | Secure Hash Algorithm. |
| HMAC-256-SHA-384 (6) | Secure Hash Algorithm. |

Valid Encryption Algorithms are:

|  |  |
| --- | --- |
| DES (1) | Data Encryption Standard. |
| AES (2) | Advanced Encryption Standard with key length of 128. |
| 3DES (3) | Triple Data Encryption Standard. |
| AES192 (4) | Advanced Encryption Standard with key length of 192. |
| AES256 (5) | Advanced Encryption Standard with key length of 256. |

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# SendTrap Method ([SNMPAgent](#snmpagent-class) Class)

Sends an SNMP Trap.

## Syntax

```text
ANSI (Cross Platform)
int SendTrap(const char* lpszRemoteHost, const char* lpszTrapOID);

Unicode (Windows)
INT SendTrap(LPCWSTR lpszRemoteHost, LPCWSTR lpszTrapOID);
```

## Remarks

Depending upon the value of the [SNMPVersion](#snmpversion-property-snmpagent-class) property, the packet is constructed as an SNMPv1 or SNMPv2 Trap PDU. The following configuration settings provide more control about how traps are generated: [TrapPort](#TrapPort), [TrapAgentAddress](#TrapAgentAddress), [TrapCommunity](#TrapCommunity), [TrapEnterprise](#TrapEnterprise). The [SysUpTime](#sysuptime-property-snmpagent-class) property provides the trap timestamp.

SendTrap sends an unauthenticated trap. The [SendSecureTrap](#sendsecuretrap-method-snmpagent-class) method is used to send authenticated SNMPv3 traps.

If any values are provided in the [Objects](#objects-property-snmpagent-class) collection, they are sent unchanged. In the case of an SNMPv2 or SNMPv3 Trap, if [Objects](#objects-property-snmpagent-class) has a count that is equal to 0, the following values are set: sysUpTime.0 equal to [SysUpTime](#sysuptime-property-snmpagent-class) and snmpTrapOID.0 equal to *TrapOID*.

For SNMPv2 and SNMPv3 Traps, *TrapOID* must contain the full OID of the Trap. For SNMPv1, TrapOID must be a string of the form *"generic.specific"* where *generic* and *specific* are numeric values providing the Trap Generic Type and Specific Type.

For SNMPv1, *TrapOID* must be of the form "GenericTrap.SpecificTrap". These values are sent in the PDU header. [TrapAgentAddress](#TrapAgentAddress) and [TrapEnterprise](#TrapEnterprise) are taken from the corresponding configuration settings.

Additionally, the following symbolic values are recognized and translated as follows:

|  |  |  |
| --- | --- | --- |
| Trap Name | OID (SNMPv2 and above) | SNMPv1 GenericType |
| coldStart | 1.3.6.1.6.3.1.1.5.1 | 0 |
| warmStart | 1.3.6.1.6.3.1.1.5.2 | 1 |
| linkDown | 1.3.6.1.6.3.1.1.5.3 | 2 |
| linkUp | 1.3.6.1.6.3.1.1.5.4 | 3 |
| authenticationFailure | 1.3.6.1.6.3.1.1.5.5 | 4 |
| egpNeighborLoss | 1.3.6.1.6.3.1.1.5.6 | 5 |
| enterpriseSpecific | 1.3.6.1.6.3.1.1.5.7 | 6 |

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# ShowCache Method ([SNMPAgent](#snmpagent-class) Class)

Lists all entries in the internal user authentication cache.

## Syntax

```text
ANSI (Cross Platform)
int ShowCache();

Unicode (Windows)
INT ShowCache();
```

## Remarks

A [CacheEntry](#cacheentry-event-snmpagent-class) event is fired for every record in the internal user authentication cache.

The internal authentication cache can be used as an alternative to the [GetUserPassword](#getuserpassword-event-snmpagent-class) event, automatically checking the cache against the security parameters provided in the request signature.

The ShowCache method is used to show the contents of the internal authentication cache.

The [ClearCache](#clearcache-method-snmpagent-class) method can be used to completely clear the cache.

## Error Handling (C++)

This method returns a result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the *GetLastErrorCode()* method after it returns.)

# Value Method ([SNMPAgent](#snmpagent-class) Class)

Returns the value corresponding to an OID.

## Syntax

```text
ANSI (Cross Platform)
char* Value(const char* lpszOID);

Unicode (Windows)
LPWSTR Value(LPCWSTR lpszOID);
```

## Remarks

If the OID does not exist in the [Objects](#objects-property-snmpagent-class) collection, a trappable error is generated.

Please refer to the [SNMPObject](#snmpobject-type) type for more information.

## Error Handling (C++)

This method returns a String value; after it returns, call the *GetLastErrorCode()* method to obtain its result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message.

# BadPacket Event ([SNMPAgent](#snmpagent-class) Class)

Fired for erroneous and/or malformed messages.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireBadPacket(SNMPAgentBadPacketEventParams *e);
typedef struct {  const char *Packet;
  int lenPacket;  const char *SourceAddress;  int SourcePort;  int ErrorCode;  const char *ErrorDescription;  int Report;
  int reserved;
} SNMPAgentBadPacketEventParams;

Unicode (Windows)
virtual INT FireBadPacket(SNMPAgentBadPacketEventParams *e);
typedef struct {  LPCSTR Packet;
  INT lenPacket;  LPCWSTR SourceAddress;  INT SourcePort;  INT ErrorCode;  LPCWSTR ErrorDescription;  BOOL Report;
  INT reserved;
} SNMPAgentBadPacketEventParams;
```

## Remarks

The full message is provided in the *Packet* parameter.

The BadPacket event is also fired when authentication fails for received packets due to a bad password or other reasons.

If the *Report* parameter is set to True, an unauthenticated error report will be sent to the client, otherwise the packet will be silently ignored.

Please refer to the [GetUserPassword](#getuserpassword-event-snmpagent-class) event for more information concerning SNMPv3 authentication.

# CacheEntry Event ([SNMPAgent](#snmpagent-class) Class)

Shows in the internal cache.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireCacheEntry(SNMPAgentCacheEntryEventParams *e);
typedef struct {  const char *User;  const char *AuthenticationProtocol;  const char *AuthenticationPassword;  const char *EncryptionAlgorithm;  const char *EncryptionPassword;
  int reserved;
} SNMPAgentCacheEntryEventParams;

Unicode (Windows)
virtual INT FireCacheEntry(SNMPAgentCacheEntryEventParams *e);
typedef struct {  LPCWSTR User;  LPCWSTR AuthenticationProtocol;  LPCWSTR AuthenticationPassword;  LPCWSTR EncryptionAlgorithm;  LPCWSTR EncryptionPassword;
  INT reserved;
} SNMPAgentCacheEntryEventParams;
```

## Remarks

CacheEntry events are triggered by a call to [ShowCache](#showcache-method-snmpagent-class). One event is fired for each user.

# Connected Event ([SNMPAgent](#snmpagent-class) Class)

Fired immediately after a connection completes (or fails).

## Syntax

```text
ANSI (Cross Platform)
virtual int FireConnected(SNMPAgentConnectedEventParams *e);
typedef struct {  const char *RemoteAddress;  int RemotePort;  int StatusCode;  const char *Description;
  int reserved;
} SNMPAgentConnectedEventParams;

Unicode (Windows)
virtual INT FireConnected(SNMPAgentConnectedEventParams *e);
typedef struct {  LPCWSTR RemoteAddress;  INT RemotePort;  INT StatusCode;  LPCWSTR Description;
  INT reserved;
} SNMPAgentConnectedEventParams;
```

## Remarks

This event fires after a connection completes or fails.

*StatusCode* is the value returned by the system TCP/IP stack. This will be 0 if the connection was successful.

*Description* contains a human readable description of the status. This will be "OK" if the connection was successful.

*RemoteAddress* is the IP address of the remote host.

*RemotePort* is the port on the remote host.

# Disconnected Event ([SNMPAgent](#snmpagent-class) Class)

Fired when a connection is closed.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireDisconnected(SNMPAgentDisconnectedEventParams *e);
typedef struct {  const char *RemoteAddress;  int RemotePort;  int StatusCode;  const char *Description;
  int reserved;
} SNMPAgentDisconnectedEventParams;

Unicode (Windows)
virtual INT FireDisconnected(SNMPAgentDisconnectedEventParams *e);
typedef struct {  LPCWSTR RemoteAddress;  INT RemotePort;  INT StatusCode;  LPCWSTR Description;
  INT reserved;
} SNMPAgentDisconnectedEventParams;
```

## Remarks

This event fires after a connection is broken.

*StatusCode* is the value returned by the system TCP/IP stack. This will be 0 if the connection was broken normally.

*Description* contains a human readable description of the status. This will be "OK" if the connection was broken normally.

*RemoteAddress* is the IP address of the remote host.

*RemotePort* is the port on the remote host.

# DiscoveryRequest Event ([SNMPAgent](#snmpagent-class) Class)

Fired when an SNMPv3 discovery packet is received.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireDiscoveryRequest(SNMPAgentDiscoveryRequestEventParams *e);
typedef struct {  const char *EngineId;
  int lenEngineId;  int EngineBoots;  int EngineTime;  const char *User;  int SecurityLevel;  const char *SourceAddress;  int SourcePort;  int Respond;
  int reserved;
} SNMPAgentDiscoveryRequestEventParams;

Unicode (Windows)
virtual INT FireDiscoveryRequest(SNMPAgentDiscoveryRequestEventParams *e);
typedef struct {  LPCSTR EngineId;
  INT lenEngineId;  INT EngineBoots;  INT EngineTime;  LPCWSTR User;  INT SecurityLevel;  LPCWSTR SourceAddress;  INT SourcePort;  BOOL Respond;
  INT reserved;
} SNMPAgentDiscoveryRequestEventParams;
```

## Remarks

*EngineId*, *EngineBoots*, *EngineTime*, and *User* are the values received from *SourceAddress*.

For SNMPv3, the *User* parameter shows the user that was supplied with the packet. This parameter *MUST* be used together with the *SecurityLevel* parameter which shows the level of security in the message.

The *SecurityLevel* parameter shows whether the request has been authenticated. If *SecurityLevel* is 0, the request has *NOT* been authenticated (i.e. the packet signature has not been verified). For an authenticated, non encrypted request, *SecurityLevel* is 1. For an authenticated and encrypted request, *SecurityLevel* is 2.

*Respond* is True by default, and will automatically send a response using the value in [LocalEngineId](#localengineid-property-snmpagent-class). To suppress the response, set *Respond* to False.

The value returned to *SourceAddress* for *EngineBoots* is always 0, and *EngineTime* is the number of seconds since January 1st, 1970 (GMT).

# Error Event ([SNMPAgent](#snmpagent-class) Class)

Fired when information is available about errors during data delivery.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireError(SNMPAgentErrorEventParams *e);
typedef struct {  int ErrorCode;  const char *Description;
  int reserved;
} SNMPAgentErrorEventParams;

Unicode (Windows)
virtual INT FireError(SNMPAgentErrorEventParams *e);
typedef struct {  INT ErrorCode;  LPCWSTR Description;
  INT reserved;
} SNMPAgentErrorEventParams;
```

## Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the class fails with an error.

The *ErrorCode* parameter contains an error code, and the *Description* parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the [Error Codes](#trappable-errors-snmpagent-class) section.

# GetBulkRequest Event ([SNMPAgent](#snmpagent-class) Class)

Fired when a GetBulkRequest packet is received.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireGetBulkRequest(SNMPAgentGetBulkRequestEventParams *e);
typedef struct {  int RequestId;  int MessageId;  int SNMPVersion;  const char *Community;  const char *User;  int SecurityLevel;  const char *SourceAddress;  int SourcePort;  int NonRepeaters;  int MaxRepetitions;  int ErrorIndex;  int ErrorStatus;  const char *ErrorDescription;  int Respond;
  int reserved;
} SNMPAgentGetBulkRequestEventParams;

Unicode (Windows)
virtual INT FireGetBulkRequest(SNMPAgentGetBulkRequestEventParams *e);
typedef struct {  INT RequestId;  INT MessageId;  INT SNMPVersion;  LPCWSTR Community;  LPCWSTR User;  INT SecurityLevel;  LPCWSTR SourceAddress;  INT SourcePort;  INT NonRepeaters;  INT MaxRepetitions;  INT ErrorIndex;  INT ErrorStatus;  LPCWSTR ErrorDescription;  BOOL Respond;
  INT reserved;
} SNMPAgentGetBulkRequestEventParams;
```

## Remarks

This is only available for SNMP versions 2 and 3.

The list of variables in the SNMP packet, including optional values and types, is provided through the [Objects](#objects-property-snmpagent-class) collection. Each object is of type [SNMPObject](#snmpobject-type). This type describes the [Oid](#SNMPObject_f_Oid), [ObjectType](#SNMPObject_f_ObjectType), and [Value](#SNMPObject_f_Value) of each SNMP object. These variables must be copied to another location before the event has completed executing, or they may be overridden by other events.

 The *SourceAddress* and *SourcePort* parameters show the address and port of the sender as reported by the TCP/IP stack.

The *MessageId* parameter identifies the received request.

For SNMPv3, the *User* parameter shows the user that was supplied with the packet. This parameter *MUST* be used together with the *SecurityLevel* parameter which shows the level of security in the message.

The *SecurityLevel* parameter shows whether the request has been authenticated. If *SecurityLevel* is 0, the request has *NOT* been authenticated (i.e. the packet signature has not been verified). For an authenticated, non encrypted request, *SecurityLevel* is 1. For an authenticated and encrypted request, *SecurityLevel* is 2.

To send a response, the *Respond* parameter must be set to true. By default, this value is false, which means no response will be sent. The *ErrorStatus* parameter may also be set to a valid SNMP status code (the default value is 0, which represents no error).

The following is a list of valid SNMP status code values:

|  |  |
| --- | --- |
| 0 (noError) | No error. |
| 1 (tooBig) | The response cannot fit in a single SNMP message. |
| 2 (noSuchName) | Variable does not exist. |
| 3 (badValue) | Invalid value or syntax. |
| 4 (readOnly) | Variable is read-only. |
| 5 (genError) | Other error (SNMPv1). |
| 6 (noAccess) | Access denied. |
| 7 (wrongType) | Wrong object type. |
| 8 (wrongLength) | Wrong length. |
| 9 (wrongEncoding) | Wrong encoding. |
| 10 (wrongValue) | Wrong value. |
| 11 (noCreation) | No creation. |
| 12 (inconsistentValue) | Inconsistent value. |
| 13 (resourceUnavailable) | Resource unavailable. |
| 14 (commitFailed) | Commit failed. |
| 15 (undoFailed) | Undo failed. |
| 16 (authorizationError) | Authorization error. |
| 17 (notWritable) | Variable is not writable. |
| 18 (inconsistentName) | Inconsistent name. |

 The *ErrorIndex* parameter indicates the index of the first variable (object) that caused an error. The default value is 0.

Variable indexes start with 0. *ErrorIndex* has no meaning when *ErrorStatus* is 0 (no error).

A GetBulkRequest is very similar to a GetNextRequest, the difference is that Getbulk performs a continuous GetNext operation based on the *MaxRepetitions* value. The *NonRepeaters* value will determine the number of [Objects](#objects-property-snmpagent-class) for which a simple GetNext operation should be performed. For the remaining variables, a continuous GetNext operation is performed based on the *MaxRepetitions* value.

So if you send a request containing X objects, the agent will perform N simple GetNext operations and M continuous GetNext operations X - N times. With X being the number of objects received, N being the number of *NonRepeaters*, and M being the number of *MaxRepetitions*. Thus the SNMPMgr is expecting to receive N + M x (X - N) objects, assuming that each object has M successors.

# GetNextRequest Event ([SNMPAgent](#snmpagent-class) Class)

Fired when a GetNextRequest packet is received.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireGetNextRequest(SNMPAgentGetNextRequestEventParams *e);
typedef struct {  int RequestId;  int MessageId;  int SNMPVersion;  const char *Community;  const char *User;  int SecurityLevel;  const char *SourceAddress;  int SourcePort;  int ErrorIndex;  int ErrorStatus;  const char *ErrorDescription;  int Respond;
  int reserved;
} SNMPAgentGetNextRequestEventParams;

Unicode (Windows)
virtual INT FireGetNextRequest(SNMPAgentGetNextRequestEventParams *e);
typedef struct {  INT RequestId;  INT MessageId;  INT SNMPVersion;  LPCWSTR Community;  LPCWSTR User;  INT SecurityLevel;  LPCWSTR SourceAddress;  INT SourcePort;  INT ErrorIndex;  INT ErrorStatus;  LPCWSTR ErrorDescription;  BOOL Respond;
  INT reserved;
} SNMPAgentGetNextRequestEventParams;
```

## Remarks

The list of variables in the SNMP packet, including optional values and types, is provided through the [Objects](#objects-property-snmpagent-class) collection. Each object is of type [SNMPObject](#snmpobject-type). This type describes the [Oid](#SNMPObject_f_Oid), [ObjectType](#SNMPObject_f_ObjectType), and [Value](#SNMPObject_f_Value) of each SNMP object. These variables must be copied to another location before the event has completed executing, or they may be overridden by other events.

 The *SourceAddress* and *SourcePort* parameters show the address and port of the sender as reported by the TCP/IP stack.

The *MessageId* parameter identifies the received request.

For SNMPv3, the *User* parameter shows the user that was supplied with the packet. This parameter *MUST* be used together with the *SecurityLevel* parameter which shows the level of security in the message.

The *SecurityLevel* parameter shows whether the request has been authenticated. If *SecurityLevel* is 0, the request has *NOT* been authenticated (i.e. the packet signature has not been verified). For an authenticated, non encrypted request, *SecurityLevel* is 1. For an authenticated and encrypted request, *SecurityLevel* is 2.

To send a response, the *Respond* parameter must be set to true. By default, this value is false, which means no response will be sent. The *ErrorStatus* parameter may also be set to a valid SNMP status code (the default value is 0, which represents no error).

The following is a list of valid SNMP status code values:

|  |  |
| --- | --- |
| 0 (noError) | No error. |
| 1 (tooBig) | The response cannot fit in a single SNMP message. |
| 2 (noSuchName) | Variable does not exist. |
| 3 (badValue) | Invalid value or syntax. |
| 4 (readOnly) | Variable is read-only. |
| 5 (genError) | Other error (SNMPv1). |
| 6 (noAccess) | Access denied. |
| 7 (wrongType) | Wrong object type. |
| 8 (wrongLength) | Wrong length. |
| 9 (wrongEncoding) | Wrong encoding. |
| 10 (wrongValue) | Wrong value. |
| 11 (noCreation) | No creation. |
| 12 (inconsistentValue) | Inconsistent value. |
| 13 (resourceUnavailable) | Resource unavailable. |
| 14 (commitFailed) | Commit failed. |
| 15 (undoFailed) | Undo failed. |
| 16 (authorizationError) | Authorization error. |
| 17 (notWritable) | Variable is not writable. |
| 18 (inconsistentName) | Inconsistent name. |

 The *ErrorIndex* parameter indicates the index of the first variable (object) that caused an error. The default value is 0.

Variable indexes start with 0. *ErrorIndex* has no meaning when *ErrorStatus* is 0 (no error).

# GetRequest Event ([SNMPAgent](#snmpagent-class) Class)

Fired when a GetRequest packet is received.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireGetRequest(SNMPAgentGetRequestEventParams *e);
typedef struct {  int RequestId;  int MessageId;  int SNMPVersion;  const char *Community;  const char *User;  int SecurityLevel;  const char *SourceAddress;  int SourcePort;  int ErrorIndex;  int ErrorStatus;  const char *ErrorDescription;  int Respond;
  int reserved;
} SNMPAgentGetRequestEventParams;

Unicode (Windows)
virtual INT FireGetRequest(SNMPAgentGetRequestEventParams *e);
typedef struct {  INT RequestId;  INT MessageId;  INT SNMPVersion;  LPCWSTR Community;  LPCWSTR User;  INT SecurityLevel;  LPCWSTR SourceAddress;  INT SourcePort;  INT ErrorIndex;  INT ErrorStatus;  LPCWSTR ErrorDescription;  BOOL Respond;
  INT reserved;
} SNMPAgentGetRequestEventParams;
```

## Remarks

The list of variables in the SNMP packet, including optional values and types, is provided through the [Objects](#objects-property-snmpagent-class) collection. Each object is of type [SNMPObject](#snmpobject-type). This type describes the [Oid](#SNMPObject_f_Oid), [ObjectType](#SNMPObject_f_ObjectType), and [Value](#SNMPObject_f_Value) of each SNMP object. These variables must be copied to another location before the event has completed executing, or they may be overridden by other events.

 The *SourceAddress* and *SourcePort* parameters show the address and port of the sender as reported by the TCP/IP stack.

The *MessageId* parameter identifies the received request.

For SNMPv3, the *User* parameter shows the user that was supplied with the packet. This parameter *MUST* be used together with the *SecurityLevel* parameter which shows the level of security in the message.

The *SecurityLevel* parameter shows whether the request has been authenticated. If *SecurityLevel* is 0, the request has *NOT* been authenticated (i.e. the packet signature has not been verified). For an authenticated, non encrypted request, *SecurityLevel* is 1. For an authenticated and encrypted request, *SecurityLevel* is 2.

To send a response, the *Respond* parameter must be set to true. By default, this value is false, which means no response will be sent. The *ErrorStatus* parameter may also be set to a valid SNMP status code (the default value is 0, which represents no error).

The following is a list of valid SNMP status code values:

|  |  |
| --- | --- |
| 0 (noError) | No error. |
| 1 (tooBig) | The response cannot fit in a single SNMP message. |
| 2 (noSuchName) | Variable does not exist. |
| 3 (badValue) | Invalid value or syntax. |
| 4 (readOnly) | Variable is read-only. |
| 5 (genError) | Other error (SNMPv1). |
| 6 (noAccess) | Access denied. |
| 7 (wrongType) | Wrong object type. |
| 8 (wrongLength) | Wrong length. |
| 9 (wrongEncoding) | Wrong encoding. |
| 10 (wrongValue) | Wrong value. |
| 11 (noCreation) | No creation. |
| 12 (inconsistentValue) | Inconsistent value. |
| 13 (resourceUnavailable) | Resource unavailable. |
| 14 (commitFailed) | Commit failed. |
| 15 (undoFailed) | Undo failed. |
| 16 (authorizationError) | Authorization error. |
| 17 (notWritable) | Variable is not writable. |
| 18 (inconsistentName) | Inconsistent name. |

 The *ErrorIndex* parameter indicates the index of the first variable (object) that caused an error. The default value is 0.

Variable indexes start with 0. *ErrorIndex* has no meaning when *ErrorStatus* is 0 (no error).

# GetUserPassword Event ([SNMPAgent](#snmpagent-class) Class)

Retrieves a password associated with a user.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireGetUserPassword(SNMPAgentGetUserPasswordEventParams *e);
typedef struct {  int PasswordType;  const char *User;  char *Password;  int Algorithm;
  int reserved;
} SNMPAgentGetUserPasswordEventParams;

Unicode (Windows)
virtual INT FireGetUserPassword(SNMPAgentGetUserPasswordEventParams *e);
typedef struct {  INT PasswordType;  LPCWSTR User;  LPWSTR Password;  INT Algorithm;
  INT reserved;
} SNMPAgentGetUserPasswordEventParams;
```

## Remarks

The GetUserPassword event is fired after initial inspection of SNMPv3 requests.

The type of password required is provided in the *PasswordType* parameter: 1 for authentication, and 2 for encryption (privacy).

The password corresponding to *User* (if any) must be provided in the *Password* parameter. If the password is valid, processing will continue to other events such as [GetRequest](#getrequest-event-snmpagent-class), [SetRequest](#setrequest-event-snmpagent-class), etc.

If the *PasswordType* parameter is 1 (authentication is used), the *Algorithm* parameter can be set. Possible values are:

|  |  |
| --- | --- |
| Value | Authentication Algorithm |
| 0 (default) | Any |
| 1 | MD5 |
| 2 | SHA1 |
| 3 | SHA256 |
| 4 | SHA512 |

 If the *PasswordType* parameter is 2 (encryption is used), the *Algorithm* parameter must also be set. Possible values are:

|  |  |
| --- | --- |
| Value | Encryption Algorithm |
| 1 (default) | DES |
| 2 | AES |
| 3 | 3DES |
| 4 | AES192 |
| 5 | AES256 |

If the password does not match the signature in the request, a [BadPacket](#badpacket-event-snmpagent-class) event will be fired, at which point you can decide whether to report the error to the client (see the description of the [BadPacket](#badpacket-event-snmpagent-class) event for more information).

If the *User* is invalid or unknown, set the password to empty string (default) to ignore the request. This will result in a [BadPacket](#badpacket-event-snmpagent-class) event being fired, at which point you can decide whether to report the error to the client or not.

# GetUserSecurityLevel Event ([SNMPAgent](#snmpagent-class) Class)

Sets the security level for an incoming packet.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireGetUserSecurityLevel(SNMPAgentGetUserSecurityLevelEventParams *e);
typedef struct {  const char *User;  const char *EngineId;
  int lenEngineId;  int SecurityLevel;
  int reserved;
} SNMPAgentGetUserSecurityLevelEventParams;

Unicode (Windows)
virtual INT FireGetUserSecurityLevel(SNMPAgentGetUserSecurityLevelEventParams *e);
typedef struct {  LPCWSTR User;  LPCSTR EngineId;
  INT lenEngineId;  INT SecurityLevel;
  INT reserved;
} SNMPAgentGetUserSecurityLevelEventParams;
```

## Remarks

The GetUserSecurityLevel event is fired after the first inspection of each SNMPv3 request. The *SecurityLevel* parameter determines the level of security for the message.

On entry, the *SecurityLevel* parameter contains the default security level for *User* if the user is located in the internal cache, or if the *User* is not found in the cache, the *SecurityLevel* will be -1.

The value of *SecurityLevel* upon exiting the event, determines how the message will be processed:

|  |  |
| --- | --- |
| -1 | The message will be ignored and a [BadPacket](#badpacket-event-snmpagent-class) event will be fired. |
| 0 | No security. The message will be processed without any authentication and/or encryption. |
| 1 | Authentication only. The message will be checked for a valid signature and the [GetUserPassword](#getuserpassword-event-snmpagent-class) event will be fired to verify the authentication password. |
| 2 | Authentication and Privacy. The message will be checked for a valid signature and the [GetUserPassword](#getuserpassword-event-snmpagent-class) event will be fired twice: first to verify the authentication password, and then to verify the privacy password. |

# HashPassword Event ([SNMPAgent](#snmpagent-class) Class)

Fired before and after a password is hashed.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireHashPassword(SNMPAgentHashPasswordEventParams *e);
typedef struct {  const char *Password;  int AuthAlgorithm;  char *Hash;
  int reserved;
} SNMPAgentHashPasswordEventParams;

Unicode (Windows)
virtual INT FireHashPassword(SNMPAgentHashPasswordEventParams *e);
typedef struct {  LPCWSTR Password;  INT AuthAlgorithm;  LPWSTR Hash;
  INT reserved;
} SNMPAgentHashPasswordEventParams;
```

## Remarks

SNMPv3 passwords are hashed in order to obtain authentication and encryption keys. This is an expensive operation, and in certain situations it may be preferable to store the hashed passwords externally and supply them on demand.

If a hash is required, the event fires with an empty string in the *Hash* parameter. In this case, you can choose to supply a value for the hash and stop the class from computing the hash.

The event also fires every time a hash is computed. In this case, the *Hash* parameter contains the value of the computed hash.

*AuthAlgorithm* contains either 1 for HMAC-MD5-96, 2 for HMAC-SHA-96 or 3 for HMAC-192-SHA-256

# PacketTrace Event ([SNMPAgent](#snmpagent-class) Class)

Fired for every packet sent or received.

## Syntax

```text
ANSI (Cross Platform)
virtual int FirePacketTrace(SNMPAgentPacketTraceEventParams *e);
typedef struct {  const char *Packet;
  int lenPacket;  int Direction;  const char *PacketAddress;  int PacketPort;
  int reserved;
} SNMPAgentPacketTraceEventParams;

Unicode (Windows)
virtual INT FirePacketTrace(SNMPAgentPacketTraceEventParams *e);
typedef struct {  LPCSTR Packet;
  INT lenPacket;  INT Direction;  LPCWSTR PacketAddress;  INT PacketPort;
  INT reserved;
} SNMPAgentPacketTraceEventParams;
```

## Remarks

The PacketTrace event shows all the packets sent or received by the class.

*Packet* contains the full contents of the datagram.

*Direction* shows the direction of the packet: 1 for incoming packets, and 2 for outgoing packets.

In the case of an incoming packet, *PacketAddress* and *PacketPort* identify the source of the packet.

In the case of an outgoing packet, *PacketAddress* and *PacketPort* identify the destination of the packet.

# ReadyToSend Event ([SNMPAgent](#snmpagent-class) Class)

Fired when the class is ready to send data.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireReadyToSend(SNMPAgentReadyToSendEventParams *e);
typedef struct {
  int reserved;
} SNMPAgentReadyToSendEventParams;

Unicode (Windows)
virtual INT FireReadyToSend(SNMPAgentReadyToSendEventParams *e);
typedef struct {
  INT reserved;
} SNMPAgentReadyToSendEventParams;
```

## Remarks

The ReadyToSend event indicates that the underlying TCP/IP subsystem is ready to accept data after a failed DataToSend(TBD. DataToSend is removed).

# Report Event ([SNMPAgent](#snmpagent-class) Class)

Fired when a Report packet is received.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireReport(SNMPAgentReportEventParams *e);
typedef struct {  int RequestId;  int SNMPVersion;  const char *Community;  const char *User;  int SecurityLevel;  const char *SourceAddress;  int SourcePort;  int ErrorIndex;  int ErrorStatus;  const char *ErrorDescription;
  int reserved;
} SNMPAgentReportEventParams;

Unicode (Windows)
virtual INT FireReport(SNMPAgentReportEventParams *e);
typedef struct {  INT RequestId;  INT SNMPVersion;  LPCWSTR Community;  LPCWSTR User;  INT SecurityLevel;  LPCWSTR SourceAddress;  INT SourcePort;  INT ErrorIndex;  INT ErrorStatus;  LPCWSTR ErrorDescription;
  INT reserved;
} SNMPAgentReportEventParams;
```

## Remarks

For SNMPv3, the *User* parameter shows the user that was supplied with the packet. This parameter *MUST* be used together with the *SecurityLevel* parameter which shows the level of security in the message.

The *SecurityLevel* parameter shows whether the request has been authenticated. If *SecurityLevel* is 0, the request has *NOT* been authenticated (i.e. the packet signature has not been verified). For an authenticated, non encrypted request, *SecurityLevel* is 1. For an authenticated and encrypted request, *SecurityLevel* is 2.

The list of variables in the SNMP packet, including optional values and types, is provided through the [Objects](#objects-property-snmpagent-class) collection. Each object is of type [SNMPObject](#snmpobject-type). This type describes the [Oid](#SNMPObject_f_Oid), [ObjectType](#SNMPObject_f_ObjectType), and [Value](#SNMPObject_f_Value) of each SNMP object. These variables must be copied to another location before the event has completed executing, or they may be overridden by other events.

 The *SourceAddress* and *SourcePort* parameters show the address and port of the sender as reported by the TCP/IP stack.

# SetRequest Event ([SNMPAgent](#snmpagent-class) Class)

Fired when a SetRequest packet is received.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireSetRequest(SNMPAgentSetRequestEventParams *e);
typedef struct {  int RequestId;  int MessageId;  int SNMPVersion;  const char *Community;  const char *User;  int SecurityLevel;  const char *SourceAddress;  int SourcePort;  int ErrorIndex;  int ErrorStatus;  const char *ErrorDescription;  int Respond;
  int reserved;
} SNMPAgentSetRequestEventParams;

Unicode (Windows)
virtual INT FireSetRequest(SNMPAgentSetRequestEventParams *e);
typedef struct {  INT RequestId;  INT MessageId;  INT SNMPVersion;  LPCWSTR Community;  LPCWSTR User;  INT SecurityLevel;  LPCWSTR SourceAddress;  INT SourcePort;  INT ErrorIndex;  INT ErrorStatus;  LPCWSTR ErrorDescription;  BOOL Respond;
  INT reserved;
} SNMPAgentSetRequestEventParams;
```

## Remarks

The list of variables in the SNMP packet, including optional values and types, is provided through the [Objects](#objects-property-snmpagent-class) collection. Each object is of type [SNMPObject](#snmpobject-type). This type describes the [Oid](#SNMPObject_f_Oid), [ObjectType](#SNMPObject_f_ObjectType), and [Value](#SNMPObject_f_Value) of each SNMP object. These variables must be copied to another location before the event has completed executing, or they may be overridden by other events.

 The *SourceAddress* and *SourcePort* parameters show the address and port of the sender as reported by the TCP/IP stack.

The *MessageId* parameter identifies the received request.

For SNMPv3, the *User* parameter shows the user that was supplied with the packet. This parameter *MUST* be used together with the *SecurityLevel* parameter which shows the level of security in the message.

The *SecurityLevel* parameter shows whether the request has been authenticated. If *SecurityLevel* is 0, the request has *NOT* been authenticated (i.e. the packet signature has not been verified). For an authenticated, non encrypted request, *SecurityLevel* is 1. For an authenticated and encrypted request, *SecurityLevel* is 2.

To send a response, the *Respond* parameter must be set to true. By default, this value is false, which means no response will be sent. The *ErrorStatus* parameter may also be set to a valid SNMP status code (the default value is 0, which represents no error).

The following is a list of valid SNMP status code values:

|  |  |
| --- | --- |
| 0 (noError) | No error. |
| 1 (tooBig) | The response cannot fit in a single SNMP message. |
| 2 (noSuchName) | Variable does not exist. |
| 3 (badValue) | Invalid value or syntax. |
| 4 (readOnly) | Variable is read-only. |
| 5 (genError) | Other error (SNMPv1). |
| 6 (noAccess) | Access denied. |
| 7 (wrongType) | Wrong object type. |
| 8 (wrongLength) | Wrong length. |
| 9 (wrongEncoding) | Wrong encoding. |
| 10 (wrongValue) | Wrong value. |
| 11 (noCreation) | No creation. |
| 12 (inconsistentValue) | Inconsistent value. |
| 13 (resourceUnavailable) | Resource unavailable. |
| 14 (commitFailed) | Commit failed. |
| 15 (undoFailed) | Undo failed. |
| 16 (authorizationError) | Authorization error. |
| 17 (notWritable) | Variable is not writable. |
| 18 (inconsistentName) | Inconsistent name. |

 The *ErrorIndex* parameter indicates the index of the first variable (object) that caused an error. The default value is 0.

Variable indexes start with 0. *ErrorIndex* has no meaning when *ErrorStatus* is 0 (no error).

# SSLClientAuthentication Event ([SNMPAgent](#snmpagent-class) Class)

Fired when the client presents its credentials to the server.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireSSLClientAuthentication(SNMPAgentSSLClientAuthenticationEventParams *e);
typedef struct {  const char *RemoteAddress;  int RemotePort;  const char *CertEncoded;
  int lenCertEncoded;  const char *CertSubject;  const char *CertIssuer;  const char *Status;  int Accept;
  int reserved;
} SNMPAgentSSLClientAuthenticationEventParams;

Unicode (Windows)
virtual INT FireSSLClientAuthentication(SNMPAgentSSLClientAuthenticationEventParams *e);
typedef struct {  LPCWSTR RemoteAddress;  INT RemotePort;  LPCSTR CertEncoded;
  INT lenCertEncoded;  LPCWSTR CertSubject;  LPCWSTR CertIssuer;  LPCWSTR Status;  BOOL Accept;
  INT reserved;
} SNMPAgentSSLClientAuthenticationEventParams;
```

## Remarks

This event fires when a client connects to the class and presents a certificate for authentication. The *Accept* parameter is a recommendation on whether to continue or close the connection. This is just a suggestion: application software must use its own logic to determine whether to continue or not.

When *Accept* is False, *Status* shows why the verification failed (otherwise, *Status* contains the string "OK").

*RemoteAddress* is the IP address of the connecting client.

*RemotePort* is the source port of the connecting client.

*CertEncoded* is the base64 encoded certificate presented by the client.

*CertSubject* is the subject of the certificate presented by the client.

*CertIssuer* is the subject of the issuer of the certificate presented by the client.

*Status* is the status of the certificate.

*Accept* defines whether the certificate is accepted.

# SSLServerAuthentication Event ([SNMPAgent](#snmpagent-class) Class)

Fires when connecting to the server.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireSSLServerAuthentication(SNMPAgentSSLServerAuthenticationEventParams *e);
typedef struct {  const char *RemoteAddress;  int RemotePort;  const char *CertEncoded;
  int lenCertEncoded;  const char *CertSubject;  const char *CertIssuer;  const char *Status;  int Accept;
  int reserved;
} SNMPAgentSSLServerAuthenticationEventParams;

Unicode (Windows)
virtual INT FireSSLServerAuthentication(SNMPAgentSSLServerAuthenticationEventParams *e);
typedef struct {  LPCWSTR RemoteAddress;  INT RemotePort;  LPCSTR CertEncoded;
  INT lenCertEncoded;  LPCWSTR CertSubject;  LPCWSTR CertIssuer;  LPCWSTR Status;  BOOL Accept;
  INT reserved;
} SNMPAgentSSLServerAuthenticationEventParams;
```

## Remarks

This event is where the client can decide whether to continue with the connection process or not. The *Accept* parameter is a recommendation on whether to continue or close the connection. This is just a suggestion: application software must use its own logic to determine whether to continue or not.

When *Accept* is False, *Status* shows why the verification failed (otherwise, *Status* contains the string "OK"). If it is decided to continue, you can override and accept the certificate by setting the *Accept* parameter to True.

*RemoteAddress* is the IP address of the server.

*RemotePort* is the source port of the server.

*CertEncoded* is the base64 encoded certificate presented by the server.

*CertSubject* is the subject of the certificate presented by the server.

*CertIssuer* is the subject of the issuer of the certificate presented by the server.

*Status* is the status of the certificate.

*Accept* defines whether the certificate is accepted.

# SSLStatus Event ([SNMPAgent](#snmpagent-class) Class)

Shows the progress of the secure connection.

## Syntax

```text
ANSI (Cross Platform)
virtual int FireSSLStatus(SNMPAgentSSLStatusEventParams *e);
typedef struct {  const char *RemoteAddress;  int RemotePort;  const char *Message;
  int reserved;
} SNMPAgentSSLStatusEventParams;

Unicode (Windows)
virtual INT FireSSLStatus(SNMPAgentSSLStatusEventParams *e);
typedef struct {  LPCWSTR RemoteAddress;  INT RemotePort;  LPCWSTR Message;
  INT reserved;
} SNMPAgentSSLStatusEventParams;
```

## Remarks

The event is fired for informational and logging purposes only. It is used to track the progress of the connection.

*RemoteAddress* is the IP address of the remote machine.

*RemotePort* is the port of the remote machine.

*Message* is the log message.

# Certificate Type

This is the digital certificate being used.

## Syntax

 *IPWorksSNMPCertificate* (declared in *ipworkssnmp.h*)

## Remarks

This type describes the current digital certificate. The certificate may be a public or private key. The fields are used to identify or select certificates.

The following fields are available:

- [EffectiveDate](#Certificate_f_EffectiveDate)

- [ExpirationDate](#Certificate_f_ExpirationDate)

- [ExtendedKeyUsage](#Certificate_f_ExtendedKeyUsage)

- [Fingerprint](#Certificate_f_Fingerprint)

- [FingerprintSHA1](#Certificate_f_FingerprintSHA1)

- [FingerprintSHA256](#Certificate_f_FingerprintSHA256)

- [Issuer](#Certificate_f_Issuer)

- [PrivateKey](#Certificate_f_PrivateKey)

- [PrivateKeyAvailable](#Certificate_f_PrivateKeyAvailable)

- [PrivateKeyContainer](#Certificate_f_PrivateKeyContainer)

- [PublicKey](#Certificate_f_PublicKey)

- [PublicKeyAlgorithm](#Certificate_f_PublicKeyAlgorithm)

- [PublicKeyLength](#Certificate_f_PublicKeyLength)

- [SerialNumber](#Certificate_f_SerialNumber)

- [SignatureAlgorithm](#Certificate_f_SignatureAlgorithm)

- [Store](#Certificate_f_Store)

- [StorePassword](#Certificate_f_StorePassword)

- [StoreType](#Certificate_f_StoreType)

- [SubjectAltNames](#Certificate_f_SubjectAltNames)

- [ThumbprintMD5](#Certificate_f_ThumbprintMD5)

- [ThumbprintSHA1](#Certificate_f_ThumbprintSHA1)

- [ThumbprintSHA256](#Certificate_f_ThumbprintSHA256)

- [Usage](#Certificate_f_Usage)

- [UsageFlags](#Certificate_f_UsageFlags)

- [Version](#Certificate_f_Version)

- [Subject](#Certificate_f_Subject)

- [Encoded](#Certificate_f_Encoded)

## Fields

 **EffectiveDate** *char* (read-only)*
*Default Value: ""*

The date on which this certificate becomes valid. Before this date, it is not valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2000 15:00:00.

 **ExpirationDate** *char* (read-only)*
*Default Value: ""*

The date on which the certificate expires. After this date, the certificate will no longer be valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2001 15:00:00.

 **ExtendedKeyUsage** *char* (read-only)*
*Default Value: ""*

A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs).

 **Fingerprint** *char* (read-only)*
*Default Value: ""*

The hex-encoded, 16-byte MD5 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: *bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02*

 **FingerprintSHA1** *char* (read-only)*
*Default Value: ""*

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: *30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84*

 **FingerprintSHA256** *char* (read-only)*
*Default Value: ""*

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: *6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53*

 **Issuer** *char* (read-only)*
*Default Value: ""*

The issuer of the certificate. This field contains a string representation of the name of the issuing authority for the certificate.

 **PrivateKey** *char* (read-only)*
*Default Value: ""*

The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data.

NOTE: The [PrivateKey](#Certificate_f_PrivateKey) may be available but not exportable. In this case, [PrivateKey](#Certificate_f_PrivateKey) returns an empty string.

 **PrivateKeyAvailable** *int (read-only)*
*Default Value: FALSE*

Whether a [PrivateKey](#Certificate_f_PrivateKey) is available for the selected certificate. If [PrivateKeyAvailable](#Certificate_f_PrivateKeyAvailable) is True, the certificate may be used for authentication purposes (e.g., server authentication).

 **PrivateKeyContainer** *char* (read-only)*
*Default Value: ""*

The name of the [PrivateKey](#Certificate_f_PrivateKey) container for the certificate (if available). This functionality is available only on Windows platforms.

 **PublicKey** *char* (read-only)*
*Default Value: ""*

The public key of the certificate. The key is provided as PEM/Base64-encoded data.

 **PublicKeyAlgorithm** *char* (read-only)*
*Default Value: ""*

The textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_DH") or an object identifier (OID) string representing the algorithm.

 **PublicKeyLength** *int (read-only)*
*Default Value: 0*

The length of the certificate's public key (in bits). Common values are 512, 1024, and 2048.

 **SerialNumber** *char* (read-only)*
*Default Value: ""*

The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number.

 **SignatureAlgorithm** *char* (read-only)*
*Default Value: ""*

The text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_MD5RSA") or an object identifier (OID) string representing the algorithm.

 **Store** *char**
*Default Value: "MY"*

The name of the certificate store for the client certificate.

The [StoreType](#Certificate_f_StoreType) field denotes the type of the certificate store specified by [Store](#Certificate_f_Store). If the store is password-protected, specify the password in [StorePassword](#Certificate_f_StorePassword).

[Store](#Certificate_f_Store) is used in conjunction with the [Subject](#Certificate_f_Subject) field to specify client certificates. If [Store](#Certificate_f_Store) has a value, and [Subject](#Certificate_f_Subject) or [Encoded](#Certificate_f_Encoded) is set, a search for a certificate is initiated. Please see the [Subject](#Certificate_f_Subject) field for details.

 Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

|  |  |
| --- | --- |
| MY | A certificate store holding personal certificates with their associated private keys. |
| CA | Certifying authority certificates. |
| ROOT | Root certificates. |

When the certificate store type is *cstPFXFile*, this property must be set to the name of the file. When the type is *cstPFXBlob*, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

 **StorePassword** *char**
*Default Value: ""*

If the type of certificate store requires a password, this field is used to specify the password needed to open the certificate store.

 **StoreType** *int*
*Default Value: 0*

The type of certificate store for this certificate.

 The class supports both public and private keys in a variety of formats. When the *cstAuto* value is used, the class will automatically determine the type. This field can take one of the following values:

```csharp
sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11,
                               @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll",
                               "123456", // PIN
                               "CN=cert_subject");
sftp.SSHUser = "test";
sftp.SSHLogon("myhost", 22);
```

```csharp
certmgr.CertStoreType = CertStoreTypes.cstPKCS11;
certmgr.OnCertList += (s, e) => {
  secKeyBlob = e.CertEncoded;
};
certmgr.CertStore = @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll";
certmgr.CertStorePassword = "123456"; // PIN
certmgr.ListStoreCertificates();

sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11, secKeyBlob, "123456", "*");
sftp.SSHUser = "test";
sftp.SSHLogon("myhost", 22);
```

|  |  |
| --- | --- |
| 0 (cstUser - default) | For Windows, this specifies that the certificate store is a certificate store owned by the current user. NOTE: This store type is not available in Java. |
| 1 (cstMachine) | For Windows, this specifies that the certificate store is a machine store. NOTE: This store type is not available in Java. |
| 2 (cstPFXFile) | The certificate store is the name of a PFX (PKCS#12) file containing certificates. |
| 3 (cstPFXBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in PFX (PKCS#12) format. |
| 4 (cstJKSFile) | The certificate store is the name of a Java Key Store (JKS) file containing certificates. NOTE: This store type is only available in Java. |
| 5 (cstJKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in Java Key Store (JKS) format. NOTE: This store type is only available in Java. |
| 6 (cstPEMKeyFile) | The certificate store is the name of a PEM-encoded file that contains a private key and an optional certificate. |
| 7 (cstPEMKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a private key and an optional certificate. |
| 8 (cstPublicKeyFile) | The certificate store is the name of a file that contains a PEM- or DER-encoded public key certificate. |
| 9 (cstPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a PEM- or DER-encoded public key certificate. |
| 10 (cstSSHPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains an SSH-style public key. |
| 11 (cstP7BFile) | The certificate store is the name of a PKCS#7 file containing certificates. |
| 12 (cstP7BBlob) | The certificate store is a string (binary) representing a certificate store in PKCS#7 format. |
| 13 (cstSSHPublicKeyFile) | The certificate store is the name of a file that contains an SSH-style public key. |
| 14 (cstPPKFile) | The certificate store is the name of a file that contains a PPK (PuTTY Private Key). |
| 15 (cstPPKBlob) | The certificate store is a string (binary) that contains a PPK (PuTTY Private Key). |
| 16 (cstXMLFile) | The certificate store is the name of a file that contains a certificate in XML format. |
| 17 (cstXMLBlob) | The certificate store is a string that contains a certificate in XML format. |
| 18 (cstJWKFile) | The certificate store is the name of a file that contains a JWK (JSON Web Key). |
| 19 (cstJWKBlob) | The certificate store is a string that contains a JWK (JSON Web Key). |
| 21 (cstBCFKSFile) | The certificate store is the name of a file that contains a BCFKS (Bouncy Castle FIPS Key Store). NOTE: This store type is only available in Java and .NET. |
| 22 (cstBCFKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in BCFKS (Bouncy Castle FIPS Key Store) format. NOTE: This store type is only available in Java and .NET. |
| 23 (cstPKCS11) | The certificate is present on a physical security key accessible via a PKCS#11 interface. To use a security key, create a new [Certificate](#certificate-type) object and pass cstPKCS11 as the [StoreType](#Certificate_f_StoreType), the full path of the PKCS#11 DLL as the [Store](#Certificate_f_Store), and the PIN as the [StorePassword](#Certificate_f_StorePassword). Code Example. SSH Authentication with Security Key (without CertMgr): Alternatively, collect the necessary data using the [CertMgr](CertMgr.md#CertMgr) class by calling the [ListStoreCertificates](CertMgr.md#CertMgr_m_ListStoreCertificates) method after setting the corresponding properties accordingly. The certificate information returned in the [CertList](CertMgr.md#CertMgr_e_CertList) event's CertEncoded parameter may be saved for later use. When using a certificate obtained with this approach, pass the previously saved security key information as the [Store](#Certificate_f_Store) and set [StorePassword](#Certificate_f_StorePassword) to the PIN. Code Example. SSH Authentication with Security Key (with CertMgr): |
| 99 (cstAuto) | The store type is automatically detected from the input data. This setting may be used with both public and private keys and can detect any of the supported formats automatically. |

 **SubjectAltNames** *char* (read-only)*
*Default Value: ""*

Comma-separated lists of alternative subject names for the certificate.

 **ThumbprintMD5** *char* (read-only)*
*Default Value: ""*

The MD5 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

 **ThumbprintSHA1** *char* (read-only)*
*Default Value: ""*

The SHA-1 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

 **ThumbprintSHA256** *char* (read-only)*
*Default Value: ""*

The SHA-256 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

 **Usage** *char* (read-only)*
*Default Value: ""*

The text description of [UsageFlags](#Certificate_f_UsageFlags).

This value will be one or more of the following strings and will be separated by commas:

- Digital Signature
- Non-Repudiation
- Key Encipherment
- Data Encipherment
- Key Agreement
- Certificate Signing
- CRL Signing
- Encipher Only

If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names.

 **UsageFlags** *int (read-only)*
*Default Value: 0*

The flags that show intended use for the certificate. The value of [UsageFlags](#Certificate_f_UsageFlags) is a combination of the following flags:

|  |  |
| --- | --- |
| 0x80 | Digital Signature |
| 0x40 | Non-Repudiation |
| 0x20 | Key Encipherment |
| 0x10 | Data Encipherment |
| 0x08 | Key Agreement |
| 0x04 | Certificate Signing |
| 0x02 | CRL Signing |
| 0x01 | Encipher Only |

Please see the [Usage](#Certificate_f_Usage) field for a text representation of [UsageFlags](#Certificate_f_UsageFlags).

This functionality currently is not available when the provider is OpenSSL.

 **Version** *char* (read-only)*
*Default Value: ""*

The certificate's version number. The possible values are the strings "V1", "V2", and "V3".

 **Subject** *char**
*Default Value: ""*

The subject of the certificate used for client authentication.

This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject.

If a matching certificate is found, the field is set to the full subject of the matching certificate.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate store.

The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=example@email.com". Common fields and their meanings are as follows:

| Field | Meaning |
| --- | --- |
| CN | Common Name. This is commonly a hostname like www.server.com. |
| O | Organization |
| OU | Organizational Unit |
| L | Locality |
| S | State |
| C | Country |
| E | Email Address |

If a field value contains a comma, it must be quoted.

 **Encoded** *char**
*Default Value: ""*

The certificate (PEM/Base64 encoded). This field is used to assign a specific certificate. The [Store](#Certificate_f_Store) and [Subject](#Certificate_f_Subject) fields also may be used to specify a certificate.

When [Encoded](#Certificate_f_Encoded) is set, a search is initiated in the current [Store](#Certificate_f_Store) for the private key of the certificate. If the key is found, [Subject](#Certificate_f_Subject) is updated to reflect the full subject of the selected certificate; otherwise, [Subject](#Certificate_f_Subject) is set to an empty string.

## Constructors

```text
Certificate()
```

 Creates a instance whose properties can be set.

```text
Certificate(const char* lpEncoded, int lenEncoded)
```

 Parses * Encoded * as an X.509 public key.

```text
Certificate(int iStoreType, const char* lpStore, int lenStore, const char* lpszStorePassword, const char* lpszSubject)
```

 * StoreType * identifies the type of certificate store to use. See for descriptions of the different certificate stores. * Store * is a byte array containing the certificate data. * StorePassword * is the password used to protect the store.

 After the store has been successfully opened, the component will attempt to find the certificate identified by * Subject * . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN). The * Subject * parameter can also take an MD5, SHA-1, or SHA-256 thumbprint of the certificate to load in a "Thumbprint=value" format.

# SNMPObject Type

The current SNMP object.

## Syntax

 *IPWorksSNMPSNMPObject* (declared in *ipworkssnmp.h*)

## Remarks

This type defines an SNMP object. Each object has an [Oid](#SNMPObject_f_Oid), [ObjectType](#SNMPObject_f_ObjectType), and [Value](#SNMPObject_f_Value). These values are populated by the class when incoming packets are received. You may use these fields to define objects to be used in outgoing packets.

The following fields are available:

- [ObjectType](#SNMPObject_f_ObjectType)

- [Oid](#SNMPObject_f_Oid)

- [TypeString](#SNMPObject_f_TypeString)

- [Value](#SNMPObject_f_Value)

## Fields

 **ObjectType** *int*
*Default Value: 5*

The current object's type. The default type is NULL (5).

The corresponding object id and value are specified by the [Oid](#SNMPObject_f_Oid) and [Value](#SNMPObject_f_Value) fields.

Possible object type values include:

|  |  |
| --- | --- |
| otInteger (2) | 2 |
| otOctetString (4) | 4 |
| otNull (5) | 5 |
| otObjectID (6) | 6 |
| otIPAddress (64) | 64 |
| otCounter32 (65) | 65 |
| otGauge32 (66) | 66 |
| otTimeTicks (67) | 67 |
| otOpaque (68) | 68 |
| otNSAP (69) | 69 |
| otCounter64 (70) | 70 |
| otUnsignedInteger32 (71) | 71 |

The class also supports the following artificial object values used to designate error conditions:

|  |  |
| --- | --- |
| otNoSuchObject (128) | No such object error. |
| otNoSuchInstance (129) | No such instance error. |
| otEndOfMibView (130) | End of MIB View error. |

 **Oid** *char**
*Default Value: ""*

The current object's id which is encoded as a string of numbers separated by periods. For instance: "1.3.6.1.2.1.1.1.0" (OID for "system description").

The corresponding object type and value (if any) are specified by the [ObjectType](#SNMPObject_f_ObjectType) and [Value](#SNMPObject_f_Value) fields.

**Example**

```text
SNMPControl.ObjCount = 1
SNMPControl.ObjId(0) = "1.3.6.1.2.1.1.1.0"
```

 **TypeString** *char* (read-only)*
*Default Value: ""*

A string representation of the current object's [ObjectType](#SNMPObject_f_ObjectType).

The corresponding object id and value are specified by the [Oid](#SNMPObject_f_Oid) and [Value](#SNMPObject_f_Value) fields.

 **Value** *char**
*Default Value: ""*

The current object's value. The corresponding object id and type are specified by the [Oid](#SNMPObject_f_Oid) and [ObjectType](#SNMPObject_f_ObjectType) fields.

**Example**

```text
SNMPControl.ObjCount = 1
SNMPControl.ObjId(0) = "1.3.6.1.2.1.1.1.0"
SNMPControl.ObjValue(0) = "New Value"
```

## Constructors

```text
SNMPObject()
```

```text
SNMPObject(const char* lpszOid)
```

```text
SNMPObject(const char* lpszOid, const char* lpValue, int lenValue)
```

```text
SNMPObject(const char* lpszOid, const char* lpValue, int lenValue, int iObjectType)
```

# IPWorksSNMPList Type

## Syntax

 *IPWorksSNMPList<T>* (declared in *ipworkssnmp.h*)

## Remarks

 *IPWorksSNMPList* is a generic class that is used to hold a collection of objects of type *T*, where *T* is one of the custom types supported by the SNMPAgent class.

```text
int GetCount() {}
```

```text
int SetCount(int count) {}
```

```text
T* Get(int index) {}
```

```text
T* Set(int index, T* value) {}
```

|  |  |
| --- | --- |
| Methods |  |
| GetCount | This method returns the current size of the collection. |
| SetCount | This method sets the size of the collection. This method returns 0 if setting the size was successful; or -1 if the collection is ReadOnly. When adding additional objects to a collection call this method to specify the new size. Increasing the size of the collection preserves existing objects in the collection. |
| Get | This method gets the item at the specified position. The index parameter specifies the index of the item in the collection. This method returns NULL if an invalid index is specified. |
| Set | This method sets the item at the specified position. The index parameter specifies the index of the item in the collection that is being set. This method returns -1 if an invalid index is specified. Note: Objects created using the new operator must be freed using the delete operator; they will not be automatically freed by the class. |

# Config Settings ([SNMPAgent](#snmpagent-class) Class)

 The class accepts one or more of the following *configuration settings*. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these *internal properties* is provided through the [Config](#config-method-snmpagent-class) method.

### SNMPAgent Config Settings

**AuthenticationKey**: The key to use for authentication.This setting takes the hex-encoded key for authentication and may be set before calling [SendSecureTrap](#sendsecuretrap-method-snmpagent-class).

**CompatibilityMode**: Whether to operate the component in a specific compatibility mode.This setting will cause the component to operate in a manner different than normal so that it is compatible with third-party products and libraries. The following table lists the possible values for this setting:

|  |  |
| --- | --- |
| 0 (default) | Component operates normally for greatest compatibility. |
| 1 | Component uses SNMP4j-compatible encryption (AES192 and AES256). |
| 2 | Component automatically detects whether to use SNMP4j-compatible encryption (AES192 and AES256). Note: This option is only applicable when receiving packets. If you are using [SNMPMgr](SNMPMgr.md#SNMPMgr) or sending secure traps, you will need to select either 0 or 1. |

**ContextEngineId**: Sets the context engine id of the SNMP entity. If set, the context engine id included in the PDU will be set.

**ContextName**: Sets the context name of the SNMP entity. If set, the context name included in the PDU will be set.

**DataToSend**: Sends a raw packet.This should be set to the hexadecimal representation of a packet. When set the represented packet is sent.

**DecryptLogPackets**: Whether to decrypt logged packets.When set to *true* this setting will cause the class to decrypt packets logged in [PacketTrace](#packettrace-event-snmpagent-class). This only applies when using SNMP Version 3. The default is *false*.

**EncryptionKey**: The key to use for encryption.This setting takes the hex-encoded key for encryption and may be set before calling [SendSecureTrap](#sendsecuretrap-method-snmpagent-class).

**ForceLocalPort**: Forces the class to bind to a specific port. The default value is True, which makes the class throw an error if [LocalPort](#localport-property-snmpagent-class) is busy. When [ForceLocalPort](#ForceLocalPort) is set to False and the port is busy, the class silently chooses another random port.

**IgnoreDiscoveryRequestType**: Treats other request types as discovery requests.When *true* tells the class to treat any request with an empty *EngineID* and *varBindList* as a discovery request. The default is *false*.

**IncomingContextEngineId**: The engine Id of the received packet.This setting holds the engine Id of the received packet. This may be queried at any time, including from within an event, and returns the engine Id of the received packet. This is not needed in most cases, but can be used to store the incoming engine Id to send an asynchronous response later. This value is read-only.

**IncomingContextName**: The context name of the received packet.This setting holds the context name of the received packet. This may be queried at any time, including from within an event, and returns the context name of the received packet. This is not needed in most cases, but can be used to store the incoming context name to send an asynchronous response later. This value is read-only.

**MsgMaxSize**: The maximum supported message size.This setting specifies the maximum supported message size in bytes. This is only applicable when [SNMPVersion](#snmpversion-property-snmpagent-class) is set to 3. This corresponds to the "msgMaxSize" field in the request. The default maximum message size is *16384* bytes.

**RespondFromDestIP**: Whether to respond from the IP address that the request was sent to.By default the class will always respond from the interface defined by [LocalHost](#localhost-property-snmpagent-class). In the case where aliases have been defined on the system, incoming traffic may have a different value for the destination. This setting tells the class to respond using a source address that matches the destination address of the received packet. This setting should only be set to True if there is a specific reason to do so.

**SourceAddress**: The source address of the received packet.This setting holds the source address of the received packet. This may be queried at any time, including from within an event, and returns the source address of the received packet. This value is read-only.

**SourcePort**: The source port of the received packet.This setting holds the source port of the received packet. This may be queried at any time, including from within an event, and returns the source port of the received packet. This value is read-only.

**TimeWindow**: The time window used for SNMPv3 timeliness checking (authentication).The default value is 150 (seconds).

**TrapAgentAddress**: The address of the object generating the trap.This setting is used to specify the agent-addr field when sending V1 Traps. The default value is the address of the localhost. This value must be an IPv4 address.

**TrapCommunity**: The value of the Community parameter for SNMP traps.Typical values are "public" or "private". The default value is "public".

**TrapEnterprise**: The type of the object generating the trap.This setting specifies the type of object generating the SNMP Trap. The default value is "1.3.6.1.6.3.1.1.5" (i.e. SNMPv2-MIB::snmpTraps).

**TrapPort**: The port where SNMP traps are sent. The *TrapPort* is the UDP port where SNMP traps are sent.

A valid port number (a value between 1 and 65535) is required. The default value is 162.

### UDP Config Settings

**CaptureIPPacketInfo**: Used to capture the packet information.If this is set to True, the component will capture the IP packet information.

The default value for this setting is False.

NOTE: This configuration setting is available only in Windows.

**DelayHostResolution**: Whether the hostname is resolved when RemoteHost is set.This configuration setting specifies whether a hostname is resolved immediately when RemoteHost is set. If *true* the class will resolve the hostname and the IP address will be present in the RemoteHost property. If *false*, the hostname is not resolved until needed by the component when a method to connect or send data is called. If desired, ResolveRemoteHost may be called to manually resolve the value in RemoteHost at any time.

The default value is *false*.

**DestinationAddress**: Used to get the destination address from the packet information.If [CaptureIPPacketInfo](#CaptureIPPacketInfo) is set to True, then this will be populated with the packet's destination address when a packet is received. This information will be accessible in the DataIn event.

NOTE: This configuration setting is available only in Windows.

**DontFragment**: Used to set the Don't Fragment flag of outgoing packets.When set to True, packets sent by the class will have the Don't Fragment flag set. The default value is False.

**LocalHost**: The name of the local host through which connections are initiated or accepted. The [LocalHost](#localhost-property-snmpagent-class) setting contains the name of the local host as obtained by the *gethostname()* system call, or if the user has assigned an IP address, the value of that address.

In multihomed hosts (machines with more than one IP interface), setting LocalHost to the value of an interface will make the class initiate connections (or accept in the case of server classes) only through that interface.

If the class is connected, the [LocalHost](#localhost-property-snmpagent-class) setting shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multihomed hosts (machines with more than one IP interface).

**LocalPort**: The port in the local host where the class binds. This configuration setting must be set before a connection is attempted. It instructs the class to bind to a specific port (or communication endpoint) in the local machine.

Setting this to 0 (default) enables the system to choose a port at random. The chosen port will be shown by [LocalPort](#localport-property-snmpagent-class) after the connection is established.

[LocalPort](#localport-property-snmpagent-class) cannot be changed once a connection is made. Any attempt to set this when a connection is active will generate an error.

This configuration setting is useful when trying to connect to services that require a trusted port on the client side. An example is the remote shell (rsh) service in UNIX systems.

**MaxPacketSize**: The maximum length of the packets that can be received.This configuration setting specifies the maximum size of the datagrams that the class will accept without truncation.

**QOSDSCPValue**: Used to specify an arbitrary QOS/DSCP setting (optional).[UseConnection](#UseConnection) must be True to use this configuration setting. This option allows you to specify an arbitrary DSCP value between 0 and 63. The default is 0. When set to the default value, the component will not set a DSCP value.

NOTE: This configuration setting uses the qWAVE API and is available only on Windows 7, Windows Server 2008 R2, and later.

**QOSTrafficType**: Used to specify QOS/DSCP settings (optional).[UseConnection](#UseConnection) must be True to use this setting. You may specify either the text or integer values: BestEffort (0), Background (1), ExcellentEffort (2), AudioVideo (3), Voice (4), and Control (5).

NOTE: This configuration setting uses the qWAVE API and is available only on Windows Vista and Windows Server 2008 or above.

NOTE: QOSTrafficType must be set before setting [Active](#active-property-snmpagent-class) to True.

**ShareLocalPort**: If set to True, allows more than one instance of the class to be active on the same local port.This option must be set before the class is activated through the [Active](#active-property-snmpagent-class) property or it will have no effect.

The default value for this setting is False.

**SourceIPAddress**: Used to set the source IP address used when sending a packet.This configuration setting can be used to override the source IP address when sending a packet.

NOTE: This configuration setting is available only in Windows and requires that the winpcap library be installed (or npcap with winpcap compatibility).

**SourceMacAddress**: Used to set the source MAC address used when sending a packet.This configuration setting can be used to override the source MAC address when sending a packet.

NOTE: This configuration setting is available only in Windows and requires that the winpcap library be installed (or npcap with winpcap compatibility).

**UseConnection**: Determines whether to use a connected socket.[UseConnection](#UseConnection) specifies whether or not the class should use a connected socket. The connection is defined as an association in between the local address/port and the remote address/port. As such, this is not a connection in the traditional Transmission Control Protocol (TCP) sense. It means only that the class will send and receive data to and from the specified destination.

The default value for this setting is False.

**UseIPv6**: Whether or not to use IPv6.By default, the component expects an IPv4 address for local and remote host properties, and it will create an IPv4 socket. To use IPv6 instead, set this to True.

### Socket Config Settings

**AbsoluteTimeout**: Determines whether timeouts are inactivity timeouts or absolute timeouts.If [AbsoluteTimeout](#AbsoluteTimeout) is set to True, any method that does not complete within Timeout seconds will be aborted. By default, *AbsoluteTimeout* is False, and the timeout is an inactivity timeout.

NOTE: This option is not valid for User Datagram Protocol (UDP) ports.

**FirewallData**: Used to send extra data to the firewall.When the firewall is a tunneling proxy, use this property to send custom (additional) headers to the firewall (e.g., headers for custom authentication schemes).

**InBufferSize**: The size in bytes of the incoming queue of the socket.This is the size of an internal queue in the Transmission Control Protocol (TCP)/IP stack. You can increase or decrease its size depending on the amount of data that you will be receiving. In some cases, increasing the value of the *InBufferSize* setting can provide significant improvements in performance.

Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated the *InBufferSize* reverts to its defined size. The same happens if you attempt to make it too large or too small.

**OutBufferSize**: The size in bytes of the outgoing queue of the socket.This is the size of an internal queue in the TCP/IP stack. You can increase or decrease its size depending on the amount of data that you will be sending. In some cases, increasing the value of the *OutBufferSize* setting can provide significant improvements in performance.

Some TCP/IP implementations do not support variable buffer sizes. If that is the case, when the class is activated the *OutBufferSize* reverts to its defined size. The same happens if you attempt to make it too large or too small.

### Base Config Settings

**BuildInfo**: Information about the product's build.When queried, this setting will return a string containing information about the product's build.

**CodePage**: The system code page used for Unicode to Multibyte translations.The default code page is Unicode UTF-8 (65001).

The following is a list of valid code page identifiers:

|  |  |
| --- | --- |
| Identifier | Name |
| 037 | IBM EBCDIC - U.S./Canada |
| 437 | OEM - United States |
| 500 | IBM EBCDIC - International |
| 708 | Arabic - ASMO 708 |
| 709 | Arabic - ASMO 449+, BCON V4 |
| 710 | Arabic - Transparent Arabic |
| 720 | Arabic - Transparent ASMO |
| 737 | OEM - Greek (formerly 437G) |
| 775 | OEM - Baltic |
| 850 | OEM - Multilingual Latin I |
| 852 | OEM - Latin II |
| 855 | OEM - Cyrillic (primarily Russian) |
| 857 | OEM - Turkish |
| 858 | OEM - Multilingual Latin I + Euro symbol |
| 860 | OEM - Portuguese |
| 861 | OEM - Icelandic |
| 862 | OEM - Hebrew |
| 863 | OEM - Canadian-French |
| 864 | OEM - Arabic |
| 865 | OEM - Nordic |
| 866 | OEM - Russian |
| 869 | OEM - Modern Greek |
| 870 | IBM EBCDIC - Multilingual/ROECE (Latin-2) |
| 874 | ANSI/OEM - Thai (same as 28605, ISO 8859-15) |
| 875 | IBM EBCDIC - Modern Greek |
| 932 | ANSI/OEM - Japanese, Shift-JIS |
| 936 | ANSI/OEM - Simplified Chinese (PRC, Singapore) |
| 949 | ANSI/OEM - Korean (Unified Hangul Code) |
| 950 | ANSI/OEM - Traditional Chinese (Taiwan; Hong Kong SAR, PRC) |
| 1026 | IBM EBCDIC - Turkish (Latin-5) |
| 1047 | IBM EBCDIC - Latin 1/Open System |
| 1140 | IBM EBCDIC - U.S./Canada (037 + Euro symbol) |
| 1141 | IBM EBCDIC - Germany (20273 + Euro symbol) |
| 1142 | IBM EBCDIC - Denmark/Norway (20277 + Euro symbol) |
| 1143 | IBM EBCDIC - Finland/Sweden (20278 + Euro symbol) |
| 1144 | IBM EBCDIC - Italy (20280 + Euro symbol) |
| 1145 | IBM EBCDIC - Latin America/Spain (20284 + Euro symbol) |
| 1146 | IBM EBCDIC - United Kingdom (20285 + Euro symbol) |
| 1147 | IBM EBCDIC - France (20297 + Euro symbol) |
| 1148 | IBM EBCDIC - International (500 + Euro symbol) |
| 1149 | IBM EBCDIC - Icelandic (20871 + Euro symbol) |
| 1200 | Unicode UCS-2 Little-Endian (BMP of ISO 10646) |
| 1201 | Unicode UCS-2 Big-Endian |
| 1250 | ANSI - Central European |
| 1251 | ANSI - Cyrillic |
| 1252 | ANSI - Latin I |
| 1253 | ANSI - Greek |
| 1254 | ANSI - Turkish |
| 1255 | ANSI - Hebrew |
| 1256 | ANSI - Arabic |
| 1257 | ANSI - Baltic |
| 1258 | ANSI/OEM - Vietnamese |
| 1361 | Korean (Johab) |
| 10000 | MAC - Roman |
| 10001 | MAC - Japanese |
| 10002 | MAC - Traditional Chinese (Big5) |
| 10003 | MAC - Korean |
| 10004 | MAC - Arabic |
| 10005 | MAC - Hebrew |
| 10006 | MAC - Greek I |
| 10007 | MAC - Cyrillic |
| 10008 | MAC - Simplified Chinese (GB 2312) |
| 10010 | MAC - Romania |
| 10017 | MAC - Ukraine |
| 10021 | MAC - Thai |
| 10029 | MAC - Latin II |
| 10079 | MAC - Icelandic |
| 10081 | MAC - Turkish |
| 10082 | MAC - Croatia |
| 12000 | Unicode UCS-4 Little-Endian |
| 12001 | Unicode UCS-4 Big-Endian |
| 20000 | CNS - Taiwan |
| 20001 | TCA - Taiwan |
| 20002 | Eten - Taiwan |
| 20003 | IBM5550 - Taiwan |
| 20004 | TeleText - Taiwan |
| 20005 | Wang - Taiwan |
| 20105 | IA5 IRV International Alphabet No. 5 (7-bit) |
| 20106 | IA5 German (7-bit) |
| 20107 | IA5 Swedish (7-bit) |
| 20108 | IA5 Norwegian (7-bit) |
| 20127 | US-ASCII (7-bit) |
| 20261 | T.61 |
| 20269 | ISO 6937 Non-Spacing Accent |
| 20273 | IBM EBCDIC - Germany |
| 20277 | IBM EBCDIC - Denmark/Norway |
| 20278 | IBM EBCDIC - Finland/Sweden |
| 20280 | IBM EBCDIC - Italy |
| 20284 | IBM EBCDIC - Latin America/Spain |
| 20285 | IBM EBCDIC - United Kingdom |
| 20290 | IBM EBCDIC - Japanese Katakana Extended |
| 20297 | IBM EBCDIC - France |
| 20420 | IBM EBCDIC - Arabic |
| 20423 | IBM EBCDIC - Greek |
| 20424 | IBM EBCDIC - Hebrew |
| 20833 | IBM EBCDIC - Korean Extended |
| 20838 | IBM EBCDIC - Thai |
| 20866 | Russian - KOI8-R |
| 20871 | IBM EBCDIC - Icelandic |
| 20880 | IBM EBCDIC - Cyrillic (Russian) |
| 20905 | IBM EBCDIC - Turkish |
| 20924 | IBM EBCDIC - Latin-1/Open System (1047 + Euro symbol) |
| 20932 | JIS X 0208-1990 & 0121-1990 |
| 20936 | Simplified Chinese (GB2312) |
| 21025 | IBM EBCDIC - Cyrillic (Serbian, Bulgarian) |
| 21027 | Extended Alpha Lowercase |
| 21866 | Ukrainian (KOI8-U) |
| 28591 | ISO 8859-1 Latin I |
| 28592 | ISO 8859-2 Central Europe |
| 28593 | ISO 8859-3 Latin 3 |
| 28594 | ISO 8859-4 Baltic |
| 28595 | ISO 8859-5 Cyrillic |
| 28596 | ISO 8859-6 Arabic |
| 28597 | ISO 8859-7 Greek |
| 28598 | ISO 8859-8 Hebrew |
| 28599 | ISO 8859-9 Latin 5 |
| 28605 | ISO 8859-15 Latin 9 |
| 29001 | Europa 3 |
| 38598 | ISO 8859-8 Hebrew |
| 50220 | ISO 2022 Japanese with no halfwidth Katakana |
| 50221 | ISO 2022 Japanese with halfwidth Katakana |
| 50222 | ISO 2022 Japanese JIS X 0201-1989 |
| 50225 | ISO 2022 Korean |
| 50227 | ISO 2022 Simplified Chinese |
| 50229 | ISO 2022 Traditional Chinese |
| 50930 | Japanese (Katakana) Extended |
| 50931 | US/Canada and Japanese |
| 50933 | Korean Extended and Korean |
| 50935 | Simplified Chinese Extended and Simplified Chinese |
| 50936 | Simplified Chinese |
| 50937 | US/Canada and Traditional Chinese |
| 50939 | Japanese (Latin) Extended and Japanese |
| 51932 | EUC - Japanese |
| 51936 | EUC - Simplified Chinese |
| 51949 | EUC - Korean |
| 51950 | EUC - Traditional Chinese |
| 52936 | HZ-GB2312 Simplified Chinese |
| 54936 | Windows XP: GB18030 Simplified Chinese (4 Byte) |
| 57002 | ISCII Devanagari |
| 57003 | ISCII Bengali |
| 57004 | ISCII Tamil |
| 57005 | ISCII Telugu |
| 57006 | ISCII Assamese |
| 57007 | ISCII Oriya |
| 57008 | ISCII Kannada |
| 57009 | ISCII Malayalam |
| 57010 | ISCII Gujarati |
| 57011 | ISCII Punjabi |
| 65000 | Unicode UTF-7 |
| 65001 | Unicode UTF-8 |

 The following is a list of valid code page identifiers for Mac OS only:

|  |  |
| --- | --- |
| Identifier | Name |
| 1 | ASCII |
| 2 | NEXTSTEP |
| 3 | JapaneseEUC |
| 4 | UTF8 |
| 5 | ISOLatin1 |
| 6 | Symbol |
| 7 | NonLossyASCII |
| 8 | ShiftJIS |
| 9 | ISOLatin2 |
| 10 | Unicode |
| 11 | WindowsCP1251 |
| 12 | WindowsCP1252 |
| 13 | WindowsCP1253 |
| 14 | WindowsCP1254 |
| 15 | WindowsCP1250 |
| 21 | ISO2022JP |
| 30 | MacOSRoman |
| 10 | UTF16String |
| 0x90000100 | UTF16BigEndian |
| 0x94000100 | UTF16LittleEndian |
| 0x8c000100 | UTF32String |
| 0x98000100 | UTF32BigEndian |
| 0x9c000100 | UTF32LittleEndian |
| 65536 | Proprietary |

**LicenseInfo**: Information about the current license.When queried, this setting will return a string containing information about the license this instance of a class is using. It will return the following information:

- Product: The product the license is for.
- Product Key: The key the license was generated from.
- License Source: Where the license was found (e.g., RuntimeLicense, License File).
- License Type: The type of license installed (e.g., Royalty Free, Single Server).
- Last Valid Build: The last valid build number for which the license will work.

**MaskSensitiveData**: Whether sensitive data is masked in log messages.In certain circumstances it may be beneficial to mask sensitive data, like passwords, in log messages. Set this to *true* to mask sensitive data. The default is *true*.

**ProcessIdleEvents**: Whether the class uses its internal event loop to process events when the main thread is idle.If set to False, the class will not fire internal idle events. Set this to False to use the class in a background thread on Mac OS. By default, this setting is True.

**SelectWaitMillis**: The length of time in milliseconds the class will wait when DoEvents is called if there are no events to process.If there are no events to process when [DoEvents](#doevents-method-snmpagent-class) is called, the class will wait for the amount of time specified here before returning. The default value is 20.

**UseInternalSecurityAPI**: Whether or not to use the system security libraries or an internal implementation. When set to *false*, the class will use the system security libraries by default to perform cryptographic functions where applicable.

Setting this configuration setting to *true* tells the class to use the internal implementation instead of using the system security libraries.

 On Windows, this setting is set to *false* by default. On Linux/macOS, this setting is set to *true* by default.

 To use the system security libraries for Linux, OpenSSL support must be enabled. For more information on how to enable OpenSSL, please refer to the [OpenSSL Notes](platforms.md) section.

# Trappable Errors ([SNMPAgent](#snmpagent-class) Class)

## Error Handling (C++)

Call the *GetLastErrorCode()* method to obtain the last called method's result code; *0* indicates success, while a non-zero error code indicates that this method encountered an error during its execution. Known error codes are listed below. If an error occurs, the *GetLastError()* method can be called to retrieve the associated error message.

### SNMPAgent Errors

|  |  |
| --- | --- |
| 201 | Timeout. |
| 301 | Bad Object Index. |
| 302 | Value exceeds maximum number of objects allowed. |
| 303 | The value must be an IP address in dotted format. |
| 305 | Unsupported SNMP version. |
| 306 | Unknown PDU type. |
| 307 | The class is busy performing the current action. |
| 308 | Verification failed. |
| 309 | Missing password for Verification. |
| 310 | Missing signature. |
| 311 | Missing remote time. |
| 312 | Missing timeout value. |
| 313 | Decryption Failed. |
| 314 | Missing password for decryption. |
| 315 | Not encrypted. |
| 316 | Security model not supported. |
| 317 | Defective packet |
| 318 | Not from bound point. |
| 319 | Operation not permitted in current role. |
| 320 | Bad packet. |
| 321 | Message not authenticated. |
| 322 | No such oid. |
| 323 | Missing privacy parameter. |
| 324 | Bad engine id. |
| 325 | Bad time frame. |
| 326 | Bad user name. |
| 327 | Security level was not accepted. |
| 328 | Discovery failed. |
| 329 | Incorrect key length. |
| 330 | No authentication password supplied. |

The class may also return one of the following error codes, which are inherited from other classes.

### UDP Errors

|  |  |
| --- | --- |
| 104 | UDP is already [Active](#active-property-snmpagent-class). |
| 106 | You cannot change the [LocalPort](#localport-property-snmpagent-class) while the class is [Active](#active-property-snmpagent-class). |
| 107 | You cannot change the [LocalHost](#localhost-property-snmpagent-class) at this time. A connection is in progress. |
| 109 | The class must be [Active](#active-property-snmpagent-class) for this operation. |
| 112 | You cannot change [MaxPacketSize](#MaxPacketSize) while the class is [Active](#active-property-snmpagent-class). |
| 113 | You cannot change [ShareLocalPort](#ShareLocalPort) option while the class is [Active](#active-property-snmpagent-class). |
| 114 | You cannot change RemoteHost when [UseConnection](#UseConnection) is set and the class [Active](#active-property-snmpagent-class). |
| 115 | You cannot change RemotePort when [UseConnection](#UseConnection) is set and the class is [Active](#active-property-snmpagent-class). |
| 116 | RemotePort cannot be zero when [UseConnection](#UseConnection) is set. Please specify a valid service port number. |
| 117 | You cannot change [UseConnection](#UseConnection) while the class is [Active](#active-property-snmpagent-class). |
| 118 | Message cannot be longer than [MaxPacketSize](#MaxPacketSize). |
| 119 | Message too short. |
| 434 | Unable to convert string to selected CodePage. |

### SSL Errors

|  |  |
| --- | --- |
| 270 | Cannot load specified security library. |
| 271 | Cannot open certificate store. |
| 272 | Cannot find specified certificate. |
| 273 | Cannot acquire security credentials. |
| 274 | Cannot find certificate chain. |
| 275 | Cannot verify certificate chain. |
| 276 | Error during handshake. |
| 280 | Error verifying certificate. |
| 281 | Could not find client certificate. |
| 282 | Could not find server certificate. |
| 283 | Error encrypting data. |
| 284 | Error decrypting data. |

### TCP/IP Errors

|  |  |
| --- | --- |
| 10004 | [10004] Interrupted system call. |
| 10009 | [10009] Bad file number. |
| 10013 | [10013] Access denied. |
| 10014 | [10014] Bad address. |
| 10022 | [10022] Invalid argument. |
| 10024 | [10024] Too many open files. |
| 10035 | [10035] Operation would block. |
| 10036 | [10036] Operation now in progress. |
| 10037 | [10037] Operation already in progress. |
| 10038 | [10038] Socket operation on nonsocket. |
| 10039 | [10039] Destination address required. |
| 10040 | [10040] Message is too long. |
| 10041 | [10041] Protocol wrong type for socket. |
| 10042 | [10042] Bad protocol option. |
| 10043 | [10043] Protocol is not supported. |
| 10044 | [10044] Socket type is not supported. |
| 10045 | [10045] Operation is not supported on socket. |
| 10046 | [10046] Protocol family is not supported. |
| 10047 | [10047] Address family is not supported by protocol family. |
| 10048 | [10048] Address already in use. |
| 10049 | [10049] Cannot assign requested address. |
| 10050 | [10050] Network is down. |
| 10051 | [10051] Network is unreachable. |
| 10052 | [10052] Net dropped connection or reset. |
| 10053 | [10053] Software caused connection abort. |
| 10054 | [10054] Connection reset by peer. |
| 10055 | [10055] No buffer space available. |
| 10056 | [10056] Socket is already connected. |
| 10057 | [10057] Socket is not connected. |
| 10058 | [10058] Cannot send after socket shutdown. |
| 10059 | [10059] Too many references, cannot splice. |
| 10060 | [10060] Connection timed out. |
| 10061 | [10061] Connection refused. |
| 10062 | [10062] Too many levels of symbolic links. |
| 10063 | [10063] File name is too long. |
| 10064 | [10064] Host is down. |
| 10065 | [10065] No route to host. |
| 10066 | [10066] Directory is not empty |
| 10067 | [10067] Too many processes. |
| 10068 | [10068] Too many users. |
| 10069 | [10069] Disc Quota Exceeded. |
| 10070 | [10070] Stale NFS file handle. |
| 10071 | [10071] Too many levels of remote in path. |
| 10091 | [10091] Network subsystem is unavailable. |
| 10092 | [10092] WINSOCK DLL Version out of range. |
| 10093 | [10093] Winsock is not loaded yet. |
| 11001 | [11001] Host not found. |
| 11002 | [11002] Nonauthoritative 'Host not found' (try again or check DNS setup). |
| 11003 | [11003] Nonrecoverable errors: FORMERR, REFUSED, NOTIMP. |
| 11004 | [11004] Valid name, no data record (check DNS setup). |