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refactored PB-TNC state machine in receive direction

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This commit is contained in:
Andreas Steffen
2010-12-09 23:38:38 +01:00
parent 7382a639fb
commit 68fada37b1
1 changed files with 90 additions and 83 deletions
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src/libcharon/plugins/tnccs_20/batch/pb_tnc_batch.c
+90 -83
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@@ -206,6 +206,93 @@ METHOD(pb_tnc_batch_t, build, void,
writer->destroy(writer);
}
/*
* Implements the PB-TNC state machine in receive direction
*/
static bool state_transition_upon_receive(pb_tnc_state_t *state,
pb_tnc_batch_type_t batch_type,
bool is_server)
{
switch (*state)
{
case PB_STATE_INIT:
if (is_server && batch_type == PB_BATCH_CDATA)
{
*state = PB_STATE_SERVER_WORKING;
break;
}
if (!is_server && batch_type == PB_BATCH_SDATA)
{
*state = PB_STATE_CLIENT_WORKING;
break;
}
if (batch_type == PB_BATCH_CLOSE)
{
*state = PB_STATE_END;
break;
}
return FALSE;
case PB_STATE_SERVER_WORKING:
if (!is_server && batch_type == PB_BATCH_SDATA)
{
*state = PB_STATE_CLIENT_WORKING;
break;
}
if (!is_server && batch_type == PB_BATCH_RESULT)
{
*state = PB_STATE_DECIDED;
break;
}
if ((is_server && batch_type == PB_BATCH_CRETRY) ||
(!is_server && batch_type == PB_BATCH_SRETRY))
{
break;
}
if (batch_type == PB_BATCH_CLOSE)
{
*state = PB_STATE_END;
break;
}
return FALSE;
case PB_STATE_CLIENT_WORKING:
if (is_server && batch_type == PB_BATCH_CDATA)
{
*state = PB_STATE_SERVER_WORKING;
break;
}
if (is_server && batch_type == PB_BATCH_CRETRY)
{
break;
}
if (batch_type == PB_BATCH_CLOSE)
{
*state = PB_STATE_END;
break;
}
return FALSE;
case PB_STATE_DECIDED:
if ((is_server && batch_type == PB_BATCH_CRETRY) ||
(!is_server && batch_type == PB_BATCH_SRETRY))
{
*state = PB_STATE_SERVER_WORKING;
break;
}
if (batch_type == PB_BATCH_CLOSE)
{
*state = PB_STATE_END;
break;
}
return FALSE;
case PB_STATE_END:
if (batch_type == PB_BATCH_CLOSE)
{
break;
}
return FALSE;
}
return TRUE;
}
static status_t process_batch_header(private_pb_tnc_batch_t *this,
pb_tnc_state_t *state)
{
@@ -214,7 +301,7 @@ static status_t process_batch_header(private_pb_tnc_batch_t *this,
pb_error_message_t *err_msg;
u_int8_t version, flags, reserved, type;
u_int32_t batch_len;
bool directionality, unexpected_batch_type = FALSE;
bool directionality;
if (this->encoding.len < PB_TNC_BATCH_HEADER_SIZE)
{
@@ -270,88 +357,8 @@ static status_t process_batch_header(private_pb_tnc_batch_t *this,
err_msg->set_offset(err_msg, 3);
goto fatal;
}
switch (*state)
{
case PB_STATE_INIT:
if (this->is_server && this->type == PB_BATCH_CDATA)
{
*state = PB_STATE_SERVER_WORKING;
break;
}
if (!this->is_server && this->type == PB_BATCH_SDATA)
{
*state = PB_STATE_CLIENT_WORKING;
break;
}
if (this->type == PB_BATCH_CLOSE)
{
*state = PB_STATE_END;
break;
}
unexpected_batch_type = TRUE;
break;
case PB_STATE_SERVER_WORKING:
if (!this->is_server && this->type == PB_BATCH_SDATA)
{
*state = PB_STATE_CLIENT_WORKING;
break;
}
if (!this->is_server && this->type == PB_BATCH_RESULT)
{
*state = PB_STATE_DECIDED;
break;
}
if ((this->is_server && this->type == PB_BATCH_CRETRY) ||
(!this->is_server && this->type == PB_BATCH_SRETRY))
{
break;
}
if (this->type == PB_BATCH_CLOSE)
{
*state = PB_STATE_END;
break;
}
unexpected_batch_type = TRUE;
break;
case PB_STATE_CLIENT_WORKING:
if (this->is_server && this->type == PB_BATCH_CDATA)
{
*state = PB_STATE_SERVER_WORKING;
break;
}
if (this->is_server && this->type == PB_BATCH_CRETRY)
{
break;
}
if (this->type == PB_BATCH_CLOSE)
{
*state = PB_STATE_END;
break;
}
unexpected_batch_type = TRUE;
break;
case PB_STATE_DECIDED:
if ((this->is_server && this->type == PB_BATCH_CRETRY) ||
(!this->is_server && this->type == PB_BATCH_SRETRY))
{
*state = PB_STATE_SERVER_WORKING;
break;
}
if (this->type == PB_BATCH_CLOSE)
{
*state = PB_STATE_END;
break;
}
unexpected_batch_type = TRUE;
break;
case PB_STATE_END:
if (this->type == PB_BATCH_CLOSE)
{
break;
}
unexpected_batch_type = TRUE;
}
if (unexpected_batch_type)
if (!state_transition_upon_receive(state, this->type, this->is_server))
{
DBG1(DBG_TNC, "Unexpected PB-TNC Batch Type: %N",
pb_tnc_batch_type_names, this->type);