/// <summary>
/// Loop epm receive process
/// </summary>
private static void epmReceiveLoop()
{
byte[] responseStub = new byte[eptMapResponseStub.Length];
Buffer.BlockCopy(eptMapResponseStub, 0, responseStub, 0, eptMapResponseStub.Length);
while (true)
{
RpceServerSessionContext context;
ushort opnum;
try
{
byte[] requestStub = epmServer.ExpectCall(EPM_RECEIVE_LOOP_TIMEOUT, out context, out opnum);
if (opnum == eptMapOpnum)
{
p_syntax_id_t ifSpec = new p_syntax_id_t();
// 37 == offset of interface uuid, 16 == the size of uuid
ifSpec.if_uuid = new Guid(ArrayUtility.SubArray(requestStub, 37, 16));
//53 == offset of interface vers_major
ifSpec.if_vers_major = BitConverter.ToUInt16(requestStub, 53);
//57 == offset of interface vers_minor
ifSpec.if_vers_minor = BitConverter.ToUInt16(requestStub, 57);
if (endpointMap.ContainsKey(ifSpec))
{
//copy tower from request stub to response stub
//37 is the offset to interface uuid in request
//53 is the offset to interface uuid in response
Buffer.BlockCopy(requestStub, 37, responseStub, 53, 70);
//modify the endpoint in big enddian oder, offset is 112
responseStub[112] = (byte)(endpointMap[ifSpec] >> 8);
responseStub[113] = (byte)endpointMap[ifSpec];
//modify the address, offset is 119
Buffer.BlockCopy(hostIp.GetAddressBytes(), 0, responseStub, 119, 4);
//todo support Ipv6
epmServer.SendResponse(context, responseStub);
}
}
}
catch (TimeoutException)
{
continue;
}
}
}
/// <summary>
/// update context on receiving RPCE CO Bind PDU.
/// </summary>
/// <param name="bindPdu">Bind PDU to receive.</param>
internal void UpdateContextOnReceivingBindPdu(RpceCoBindPdu bindPdu)
{
this.MaxTransmitFragmentSize = bindPdu.max_xmit_frag;
this.MaxReceiveFragmentSize = bindPdu.max_recv_frag;
if (bindPdu.assoc_group_id != 0)
{
this.AssociateGroupId = bindPdu.assoc_group_id;
}
else
{
if (this.associateGroupIdList.Count == 0)
{
this.AssociateGroupId = bindPdu.assoc_group_id + 1;
}
else
{
this.associateGroupIdList.Sort();
this.AssociateGroupId = this.associateGroupIdList[this.associateGroupIdList.Count - 1] + 1;
}
}
associateGroupIdList.Add(this.AssociateGroupId);
if (bindPdu.p_context_elem.p_cont_elem != null &&
bindPdu.p_context_elem.p_cont_elem.Length > 0)
{
this.InterfaceId
= bindPdu.p_context_elem.p_cont_elem[0].abstract_syntax.if_uuid;
this.InterfaceMajorVersion
= bindPdu.p_context_elem.p_cont_elem[0].abstract_syntax.if_vers_major;
this.InterfaceMinorVersion
= bindPdu.p_context_elem.p_cont_elem[0].abstract_syntax.if_vers_minor;
this.NdrVersion = RpceNdrVersion.None;
this.PresentationContextsTable.Clear();
for (int i = 0; i < bindPdu.p_context_elem.p_cont_elem.Length; i++)
{
p_cont_elem_t p_cont_elem = bindPdu.p_context_elem.p_cont_elem[i];
if (p_cont_elem.transfer_syntaxes == null)
{
continue;
}
for (int j = 0; j < p_cont_elem.transfer_syntaxes.Length; j++)
{
p_syntax_id_t transfer_syntax = p_cont_elem.transfer_syntaxes[j];
if (transfer_syntax.if_uuid == RpceUtility.NDR_INTERFACE_UUID
&&
transfer_syntax.if_vers_major == RpceUtility.NDR_INTERFACE_MAJOR_VERSION
&&
transfer_syntax.if_vers_minor == RpceUtility.NDR_INTERFACE_MINOR_VERSION)
{
this.NdrVersion |= RpceNdrVersion.NDR;
this.PresentationContextsTable.Add(p_cont_elem.p_cont_id, RpceNdrVersion.NDR);
}
else if (transfer_syntax.if_uuid == RpceUtility.NDR64_INTERFACE_UUID
&&
transfer_syntax.if_vers_major == RpceUtility.NDR64_INTERFACE_MAJOR_VERSION
&&
transfer_syntax.if_vers_minor == RpceUtility.NDR64_INTERFACE_MINOR_VERSION)
{
this.NdrVersion |= RpceNdrVersion.NDR64;
this.PresentationContextsTable.Add(p_cont_elem.p_cont_id, RpceNdrVersion.NDR64);
}
else
{
byte[] uuid = transfer_syntax.if_uuid.ToByteArray();
if (ArrayUtility.CompareArrays(
ArrayUtility.SubArray(
uuid,
0,
RpceUtility.BIND_TIME_FEATURE_NEGOTIATION_BITMASK_PREFIX_LENGTH),
ArrayUtility.SubArray(
RpceUtility.BIND_TIME_FEATURE_NEGOTIATION_BITMASK_GUID_BYTES,
0,
RpceUtility.BIND_TIME_FEATURE_NEGOTIATION_BITMASK_PREFIX_LENGTH))
&&
transfer_syntax.if_vers_major == 1
&&
transfer_syntax.if_vers_minor == 0)
{
this.BindTimeFeatureNegotiationBitmask = (RpceBindTimeFeatureNegotiationBitmask)
uuid[RpceUtility.BIND_TIME_FEATURE_NEGOTIATION_BITMASK_PREFIX_LENGTH];
}
}
}
}
}
}
/// <summary>
/// Loop epm receive process
/// </summary>
private static void epmReceiveLoop()
{
byte[] responseStub = new byte[eptMapResponseStub.Length];
Buffer.BlockCopy(eptMapResponseStub, 0, responseStub, 0, eptMapResponseStub.Length);
while (true)
{
RpceServerSessionContext context;
ushort opnum;
try
{
byte[] requestStub = epmServer.ExpectCall(EPM_RECEIVE_LOOP_TIMEOUT, out context, out opnum);
if (opnum == eptMapOpnum)
{
p_syntax_id_t ifSpec = new p_syntax_id_t();
// 37 == offset of interface uuid, 16 == the size of uuid
ifSpec.if_uuid = new Guid(ArrayUtility.SubArray(requestStub, 37, 16));
//53 == offset of interface vers_major
ifSpec.if_vers_major = BitConverter.ToUInt16(requestStub, 53);
//57 == offset of interface vers_minor
ifSpec.if_vers_minor = BitConverter.ToUInt16(requestStub, 57);
if (endpointMap.ContainsKey(ifSpec))
{
//copy tower from request stub to response stub
//37 is the offset to interface uuid in request
//53 is the offset to interface uuid in response
Buffer.BlockCopy(requestStub, 37, responseStub, 53, 70);
//modify the endpoint in big enddian oder, offset is 112
responseStub[112] = (byte)(endpointMap[ifSpec] >> 8);
responseStub[113] = (byte)endpointMap[ifSpec];
//modify the address, offset is 119
Buffer.BlockCopy(hostIp.GetAddressBytes(), 0, responseStub, 119, 4);
//todo support Ipv6
epmServer.SendResponse(context, responseStub);
}
}
}
catch (TimeoutException)
{
continue;
}
}
}
