GetHostByAddr Method of the IFWXFirewall Interface

The GetHostByAddr method retrieves host information corresponding to an address.

Syntax

HRESULT GetHostByAddr(
  [in]	 const char* addr,
  [in]	 int len,
  [in]	 int type,
  [out]	char* buf,
  [in, out]  int* buflen
);

Parameters

addr

Pointer to the network address for the host. Host addresses are stored in network byte order.

len

Length of the address.

type

Type of the address.

buf

Pointer to the data area to receive the hostent data. The data area must be larger than the size of a hostent structure because the supplied data area is used by Windows Sockets to contain a hostent structure and all of the data referenced by members of the hostent structure. A buffer of MAXGETHOSTSTRUCT bytes is recommended.

buflen

On input, specifies the size of the data area for the buf parameter. If the buffer is too small, the error code HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER) is returned and the buflen parameter receives the size of the required buffer.

Return Value

S_OK

Success, the buffer was filled with the host information.

HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER)

Insufficient buffer space was provided. That is, the buffer pointed to by the buf parameter is not large enough to contain the host information. For more information, see the description of the buflen parameter.

HRESULT_FROM_WIN32(WSAHOST_NOT_FOUND)

The address specified could not be found in the relevant database.

HRESULT_FROM_WIN32(WSATRY_AGAIN)

No response was received from an authoritative server.

HRESULT_FROM_WIN32(WSANO_DATA)

The address specified is valid and was found in the database, but no information of the type requested is associated with it.

Remarks

Unlike the IFWXSession::GetHostByAddr method, this method does not check permissions or policy rules, does not log the name resolution, and cannot use autodial to dial out for the name resolution.

Requirements

Server Requires Windows Server 2008.
Version Requires Forefront Threat Management Gateway (TMG).
Header

Declared in Wspfwext.idl.

DLL

Requires Wspsrv.exe.

See Also

IFWXFirewall
IFWXSession::GetHostByAddr


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Build date: 11/30/2009

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