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doubango/tinySIGCOMP/src/tcomp_message.c

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/*
* Copyright (C) 2010-2011 Mamadou Diop.
*
* Contact: Mamadou Diop <diopmamadou(at)doubango[dot]org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DOUBANGO.
*
*/
/**@file tcomp_message.c
* @brief SIGCOMP message as per RFC 3320 subclause 7.
* A message sent from the compressor dispatcher to the decompressordispatcher. In case of a message-based transport such as UDP, a
* SigComp message corresponds to exactly one datagram. For a stream-based transport such as TCP, the SigComp messages are
* separated by reserved delimiters.
*
* @author Mamadou Diop <diopmamadou(at)yahoo.fr>
*
*/
#include "tcomp_message.h"
#include "tcomp_nack_codes.h"
#include "tsk_memory.h"
#include "tsk_debug.h"
#include "tsk_binaryutils.h"
#include "tsk_sha1.h"
#include <string.h>
#define MIN_LEN 2
#define HEADER_GET_LEN(message) (message->headerSigComp & 0x03)
#define HEADER_GET_T(message) (message->headerSigComp & 0x04)
#define HEADER_IS_VALID(message) (message->headerSigComp >= 0xf8)
#define HEADER_GET_DEST_VALUE(destination) ( sigcomp_encoding_destination[destination] )
#define HEADER_GET_STATE_LENGTH(length) ( sigcomp_encoding_partial_id_length[length] )
static void initFeedbackItem(tcomp_message_t *message, uint8_t** start_ptr);
static void initStateId(tcomp_message_t *message, uint8_t** start_ptr, uint8_t state_len);
static void initStateful(tcomp_message_t *message, uint8_t** start_ptr, uint8_t* end_ptr);
static void initStateless(tcomp_message_t *message, uint8_t** start_ptr, uint8_t* end_ptr, int32_t *nack_code);
static void initNack(tcomp_message_t *message, uint8_t** start_ptr, uint8_t* end_ptr, int32_t* nack_code);
/*
Creates new SigComp message.
*/
tcomp_message_t* tcomp_message_create(const void* input_ptr, tsk_size_t input_size, tsk_bool_t stream, int32_t* nack_code)
{
tcomp_message_t *message;
if(!nack_code) {
TSK_DEBUG_ERROR("Invalid parameter");
return tsk_null;
}
if(!input_ptr) {
TSK_DEBUG_ERROR("Invalid parameter");
*nack_code = NACK_INTERNAL_ERROR;
return tsk_null;
}
if(input_size < MIN_LEN) {
TSK_DEBUG_ERROR("MESSAGE_TOO_SHORT");
*nack_code = NACK_MESSAGE_TOO_SHORT;
return tsk_null;
}
if((message = tsk_object_new(tcomp_message_def_t))) {
uint8_t *dummy_ptr, *end_ptr;
uint8_t state_len;
message->startPtr = input_ptr;
message->stateId = tcomp_buffer_create_null();
message->remaining_sigcomp_buffer = tcomp_buffer_create_null();
message->uploaded_UDVM_buffer = tcomp_buffer_create_null();
message->ret_feedback_buffer= tcomp_buffer_create_null();
message->isNack = 0;
dummy_ptr = ((uint8_t*)input_ptr);
end_ptr = (dummy_ptr + input_size);
//
message->totalSize = input_size;
message->stream_based = stream;
message->bytecodes_destination = 0;
/* Get sigcomp header */
message->headerSigComp = *dummy_ptr;
dummy_ptr++;
/* Check message validity --> magic code (11111)? */
message->isOK = HEADER_IS_VALID(message);
if(!message->isOK) {
TSK_DEBUG_ERROR("SigComp Message not valid (magic code mismatch)");
*nack_code = NACK_INTERNAL_ERROR;
goto bail;
}
/* Feedback item */
if((HEADER_GET_T(message)!=0)) {
initFeedbackItem(message, &dummy_ptr);
if(!message->isOK) {
goto bail;
}
}
/*
* If the len field is non-zero, then the SigComp message contains a state identifier
* to access a state item at the receiving endpoint.
*/
state_len = HEADER_GET_STATE_LENGTH( HEADER_GET_LEN(message) );
if(state_len) {
initStateId(message, &dummy_ptr, state_len);
initStateful(message, &dummy_ptr, end_ptr);
TSK_DEBUG_INFO("SigComp - Decompressing stateful message with state id =");
tcomp_buffer_print(message->stateId);
}
else {
if( !*dummy_ptr && !(*(dummy_ptr+1)&0xf0) ) {
// "code_len" field of zero --> it's a nack
initNack(message, &dummy_ptr, end_ptr, nack_code);
}
else {
initStateless(message, &dummy_ptr, end_ptr, nack_code);
}
}
/*
* The fields (RFC 3320 section 7) except for the "remaining SigComp message" are referred to
* as the "SigComp header" (note that this may include the uploaded UDVM bytecode).
*/
if(message->isOK) {
message->header_size = ( message->totalSize - tcomp_buffer_getSize(message->remaining_sigcomp_buffer));
}
}
else {
TSK_DEBUG_ERROR("Failed to create new SigComp message");
}
bail:
if(message && !message->isOK) {
TSK_OBJECT_SAFE_FREE(message);
}
return message;
}
/*
Iniatizes the feedback item field.
*/
static void initFeedbackItem(tcomp_message_t *message, uint8_t** start_ptr)
{
/*
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+---+---+---+---+---+---+---+---+ +---+---+---+---+---+---+---+---+
| 0 | returned_feedback_field | | 1 | returned_feedback_length |
+---+---+---+---+---+---+---+---+ +---+---+---+---+---+---+---+---+
| |
: returned_feedback_field :
| |
+---+---+---+---+---+---+---+---+
*/
if((**start_ptr) <= 128) {
tcomp_buffer_referenceBuff(message->ret_feedback_buffer, *start_ptr, 1);
(void)(*start_ptr++);
}
else {
tcomp_buffer_referenceBuff(message->ret_feedback_buffer, *start_ptr, 1+(**start_ptr&0x7f));
*start_ptr += tcomp_buffer_getSize(message->ret_feedback_buffer);
}
}
/*
Initializes the state identifier field.
*/
static void initStateId(tcomp_message_t *message, uint8_t** start_ptr, uint8_t state_len)
{
tcomp_buffer_referenceBuff(message->stateId, *start_ptr, state_len);
*start_ptr += state_len;
}
/*
Initializes a stateful SigComp message.
*/
static void initStateful(tcomp_message_t *message, uint8_t** start_ptr, uint8_t* end_ptr)
{
/*
+---+---+---+---+---+---+---+---+
| |
: partial state identifier :
| |
+---+---+---+---+---+---+---+---+
| |
: remaining SigComp message :
| |
+---+---+---+---+---+---+---+---+
*/
message->isOK &= (*start_ptr<=end_ptr);
if(message->isOK) {
tcomp_buffer_referenceBuff(message->remaining_sigcomp_buffer, *start_ptr,
((end_ptr-*start_ptr)));
}
}
/*
Initializes a stateless SigComp message.
*/
static void initStateless(tcomp_message_t *message, uint8_t** start_ptr, uint8_t* end_ptr, int32_t *nack_code)
{
int has_bytecode = (HEADER_GET_LEN(message) == 0); // No state ==> message contains udvm bytecode
message->isOK &= has_bytecode;
if(!message->isOK) {
return;
}
/*
+---+---+---+---+---+---+---+---+
| code_len |
+---+---+---+---+---+---+---+---+
| code_len | destination |
+---+---+---+---+---+---+---+---+
| |
: uploaded UDVM bytecode :
| |
+---+---+---+---+---+---+---+---+
| |
: remaining SigComp message :
| |
+---+---+---+---+---+---+---+---+
*/
{
uint32_t code_len1, bytecodes_len;
uint8_t code_len2, destination, *bytecodes_uploaded_udvm, *remaining_SigComp_message;
uint8_t* dummy_ptr = ((uint8_t*)*start_ptr);
/* Code_len --> 12bits [8+4] */
code_len1 = *dummy_ptr;
dummy_ptr++; /* skip first code_len 8bits */
code_len2 = (*dummy_ptr) & 0xf0; /* code_len 4 remaining bits */
destination = (*dummy_ptr) & 0x0f; /* 4bits after code_len */
dummy_ptr++; /* skip code_len 4bits + destination 4bits ==> 1-byte */
/* Get bytecodes length (12bits) */
bytecodes_len = ( (code_len1<<4)|(code_len2>>4) );
/* Starting memory address (code destination address). In UDVM. */
message->bytecodes_destination = HEADER_GET_DEST_VALUE(destination);
if((message->bytecodes_destination < 128) || (message->bytecodes_destination > 1024)) {
TSK_DEBUG_ERROR("INVALID_CODE_LOCATION");
*nack_code = NACK_INVALID_CODE_LOCATION;
message->isOK = 0;
return;
}
/* Uploaded UDVM pointer */
bytecodes_uploaded_udvm = dummy_ptr; /* SigComp header, feedback_item, code_len and destination have been skipped */
/* Skip uploaded udvm */
dummy_ptr += bytecodes_len;
/* remaining SigComp message */
remaining_SigComp_message = dummy_ptr;
/* check that remaining sigcomp message is valide */
if( !(message->isOK &= (remaining_SigComp_message <= end_ptr )) ) {
TSK_DEBUG_ERROR("MESSAGE_TOO_SHORT");
*nack_code = NACK_MESSAGE_TOO_SHORT;
return;
}
//
// Setting buffers
//
tcomp_buffer_referenceBuff(message->uploaded_UDVM_buffer, bytecodes_uploaded_udvm, bytecodes_len);
tcomp_buffer_referenceBuff(message->remaining_sigcomp_buffer, remaining_SigComp_message, ((end_ptr-remaining_SigComp_message)));
}
}
/*
Initializes a NACK message as per RFC 4077.
*/
static void initNack(tcomp_message_t *message, uint8_t** start_ptr, uint8_t* end_ptr, int32_t* nack_code)
{
/*
+---+---+---+---+---+---+---+---+
| code_len = 0 |
+---+---+---+---+---+---+---+---+
| code_len = 0 | version = 1 |
+---+---+---+---+---+---+---+---+
| Reason Code |
+---+---+---+---+---+---+---+---+
| OPCODE of failed instruction |
+---+---+---+---+---+---+---+---+
| PC of failed instruction |
| |
+---+---+---+---+---+---+---+---+
| |
: SHA-1 Hash of failed message :
| |
+---+---+---+---+---+---+---+---+
| |
: Error Details :
| |
+---+---+---+---+---+---+---+---+*/
uint8_t* dummy_ptr;
message->isNack = 1;
if( (end_ptr - *start_ptr)<25 ) {
*nack_code = NACK_MESSAGE_TOO_SHORT;
TSK_DEBUG_ERROR("MESSAGE_TOO_SHORT");
message->isOK = 0;
return;
}
dummy_ptr = ((uint8_t*)*start_ptr);
dummy_ptr++; /* skip first code_len byte */
if(!(message->isOK = (*dummy_ptr++ == NACK_VERSION))) {
return;
}
if(!message->nack_info) {
message->nack_info = tcomp_nackinfo_create();
}
message->nack_info->reasonCode = *dummy_ptr++;
message->nack_info->opcode = *dummy_ptr++;
message->nack_info->pc = TSK_BINARY_GET_2BYTES(dummy_ptr);
dummy_ptr+=2;
memcpy(message->nack_info->sha1, dummy_ptr, TSK_SHA1_DIGEST_SIZE);
dummy_ptr += TSK_SHA1_DIGEST_SIZE;
if(dummy_ptr < end_ptr) {
/* Has error details */
tcomp_buffer_appendBuff(message->nack_info->details, dummy_ptr, (end_ptr-dummy_ptr));
}
}
//========================================================
// SigComp message object definition
//
static tsk_object_t* tcomp_message_ctor(tsk_object_t *self, va_list * app)
{
tcomp_message_t *message = self;
if(message) {
}
return self;
}
static tsk_object_t* tcomp_message_dtor(tsk_object_t *self)
{
tcomp_message_t *message = self;
if(message) {
TSK_OBJECT_SAFE_FREE(message->stateId);
TSK_OBJECT_SAFE_FREE(message->remaining_sigcomp_buffer);
TSK_OBJECT_SAFE_FREE(message->uploaded_UDVM_buffer);
TSK_OBJECT_SAFE_FREE(message->ret_feedback_buffer);
TSK_OBJECT_SAFE_FREE(message->nack_info);
}
else {
TSK_DEBUG_WARN("NULL SigComp message.");
}
return self;
}
static const tsk_object_def_t tcomp_message_def_s = {
sizeof(tcomp_message_t),
tcomp_message_ctor,
tcomp_message_dtor,
tsk_null
};
const tsk_object_def_t* tcomp_message_def_t = &tcomp_message_def_s;
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