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cipfile.c
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cipfile.c
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/*******************************************************************************
* Copyright (c) 2020, Rockwell Automation, Inc.
* All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include <string.h>
#include "cipfile.h"
#include "endianconv.h"
#include "cipcommon.h"
#include "opener_api.h"
#include "trace.h"
#include "cipstring.h"
#include "cipstringi.h"
#define STATIC_FILE_OBJECT_NUMBER_OF_INSTANCES 1
#define CIP_FILE_OBJECT_DEFAULT_TIMEOUT 10U
static CipClass *file_object_class = NULL;
static CipFileObjectValues file_object_values[
STATIC_FILE_OBJECT_NUMBER_OF_INSTANCES];
static CipFileObjectValues *eds_file_instance = &file_object_values[0]; /* EDS file instance*/
static CipBool dummy_attribute;
static const CipUint kCipFileEDSAndIconFileInstanceNumber = 0xC8U; //200
typedef struct cip_file_upload_session {
bool inUse;
CipFileObjectValues *associated_instance;
size_t last_send_size;
CipUsint negotiated_transfer_size;
CipUsint transfer_number;
uint_fast64_t session_timeout_milliseconds;
} CipFileObjectUploadSession;
#define CIP_FILE_UPLOAD_SESSIONS 1
static CipFileObjectUploadSession upload_sessions[CIP_FILE_UPLOAD_SESSIONS];
typedef struct cip_file_download_session {
bool inUse;
CipFileObjectValues *associated_instance;
CipUdint file_size;
CipUint file_format_version;
CipRevision file_revision;
CipStringI file_name;
CipOctet data[CIP_FILE_MAX_TRANSFERABLE_SIZE];
CipOctet *current_data_position;
CipUsint negotiated_transfer_size;
CipUsint transfer_number;
} CipFileDownloadSession;
#define CIP_FILE_MAX_FILE_TRANSFER_SESSIONS 1
CipFileDownloadSession download_sessions[CIP_FILE_MAX_FILE_TRANSFER_SESSIONS];
typedef enum cip_file_initiate_general_status_code {
kCipFileInitiateGeneralStatusFileNameTooLong = 0x15U,
kCipFileInitiateGeneralStatusTooManyLanguagesInFileName = 0x15U,
kCipFileInitiateGeneralStatusFileEmpty = 0x0CU,
kCipFileInitiateGeneralStatusFileOffsetOutOfRange = 0x20U,
kCipFileInitiateGeneralStatusReadWriteSizeGoesBeyondEndOfFile = 0x20U
} CipFileInitiateGeneralStatusCode;
typedef enum cip_file_initiate_extended_status_code {
kCipFileInitiateExtendedStatusFileSizeTooLarge = 0x0004U,
kCipFileInitiateExtendedStatusFileFormatVersionNotCompatible = 0x0005U,
kCipFileInitiateExtendedStatusFailOnTransferZeroSize = 0x0008U,
kCipFileInitiateExtendedStatusFileNameEmpty = 0x000AU,
kCipFileInitiateExtendedStatusFileNameTooLong = 0x0001U,
kCipFileInitiateExtendedStatusTooManyLanguagesInFileName = 0x0002U,
kCipFileInitiateExtendedStatusFileEmpty = 0x0000U, /**< Dummy code indicating no additional code required */
kCipFileInitiateExtendedStatusFileOffsetOutOfRange = 0x0002U,
kCipFileInitiateExtendedStatusReadWriteSizeGoesBeyondEndOfFile = 0x0003U
} CipFileInitiateExtendedStatusCode;
typedef enum cip_file_transfer_general_status_code {
kCipFileTransferGeneralStatusFailOnTransferOutOfSequence = 0x20U,
kCipFileTransferGeneralStatusFailOnTransferOther = 0x20U,
kCipFileTransferGeneralStatusFailOnTransferZeroSize = 0x20U,
kCipFileTransferGeneralStatusFailOnTransferDuplicate = 0x20U,
kCipFileTransferGeneralStatusTransferAlreadyInitiatedOrInProgress = 0x0CU, /**< additional status state attribute */
kCipFileTransferGeneralStatusFailOnChecksum = 0xD0U, /**< Fail on checksum */
kCipFileTransferGeneralStatusFailOnSaveToNonVolatileMemory = 0x0019U /**< Dummy code indicating no additional code required */
} CipFileTransferGeneralStatusCode;
typedef enum cip_file_transfer_extended_status_code {
kCipFileTransferExtendedStatusFailOnTransferOutOfSequence = 0x0006U,
kCipFileTransferExtendedStatusFailOnTransferOther = 0x0007U,
kCipFileTransferExtendedStatusFailOnTransferZeroSize = 0x0008U,
kCipFileTransferExtendedStatusFailOnTransferDuplicate = 0x000BU,
kCipFileTransferExtendedStatusFileNameTooLong = 0x0001U,
kCipFileTransferExtendedStatusFailOnChecksum = 0x0000U, /**< Dummy code indicating no additional code required */
kCipFileTransferExtendedStatusFailOnSaveToNonVolatileMemory = 0x0000U /**< Dummy code indicating no additional code required */
} CipFileTransferExtendedStatusCode;
/** @brief Valid values for CIP File Object State
*
*/
typedef enum cip_file_object_state {
kCipFileObjectStateNonExistent = 0,
kCipFileObjectStateFileEmpty,
kCipFileObjectStateFileLoaded,
kCipFileObjectStateTransferUploadInitiated,
kCipFileObjectStateTransferDownloadInitiated,
kCipFileObjectStateTransferUploadInProgress,
kCipFileObjectStateTransferDownloadInProgress,
kCipFileObjectStateStoring
} CipFileObjectState;
void CipFileSetDownloadAndClearSupported(
CipFileObjectValues *const file_instance);
CipFileObjectUploadSession *CipFileGetUnusedUploadSession() {
for(size_t i = 0; i < CIP_FILE_UPLOAD_SESSIONS; ++i) {
if(false == upload_sessions[i].inUse) {
return &upload_sessions[i];
}
}
return NULL;
}
void CipFileInitializeUploadSessions() {
memset(upload_sessions,
0,
sizeof(CipFileObjectUploadSession) * CIP_FILE_UPLOAD_SESSIONS);
}
void CipFileResetTimeout(CipFileObjectUploadSession *const session) {
session->session_timeout_milliseconds =
session->associated_instance->file_transfer_timeout * 1000ULL; /* seconds to milliseconds */
}
void CipFileReleaseUploadSession(CipFileObjectValues *const struct_to_instance)
{
if(NULL != struct_to_instance->aquired_session) {
memset( struct_to_instance->aquired_session, 0,
sizeof(CipFileObjectUploadSession) );
struct_to_instance->aquired_session = NULL;
}
}
void CipFileTimeoutSession(CipFileObjectUploadSession *const session) {
CipFileObjectValues *const struct_to_instance = session->associated_instance;
OPENER_TRACE_INFO("Upload session timed out\n");
if(NULL != struct_to_instance->file_handle) {
rewind(struct_to_instance->file_handle);
}
CipFileReleaseUploadSession(struct_to_instance);
struct_to_instance->state = kCipFileObjectStateFileLoaded;
}
void CipFileSessionTimerCheck(const MilliSeconds elapsed_time) {
for(size_t i = 0; i < CIP_FILE_UPLOAD_SESSIONS; ++i) {
if(upload_sessions[i].inUse) {
if(elapsed_time > upload_sessions[i].session_timeout_milliseconds) {
CipFileTimeoutSession(&upload_sessions[i]);
} else {
upload_sessions[i].session_timeout_milliseconds -= elapsed_time;
} OPENER_TRACE_INFO("CipFile: Time left %" PRIu64 "\n",
upload_sessions[i].session_timeout_milliseconds);
}
}
}
void CipFileTakeUploadSession(CipFileObjectValues *const struct_to_instance,
CipFileObjectUploadSession *const session) {
struct_to_instance->aquired_session = session;
session->inUse = true;
session->associated_instance = struct_to_instance;
CipFileResetTimeout(session);
}
void CipFileEncodeFileRevision(const void *const data,
ENIPMessage *const outgoing_message) {
const CipFileObjectFileRevision *const file_revision = data;
EncodeCipUsint(&(file_revision->major_revision), outgoing_message);
EncodeCipUsint(&(file_revision->minor_revision), outgoing_message);
}
void EncodeCipFileObjectDirectory(const void *const data,
ENIPMessage *const outgoing_message) {
CipClass *const class = GetCipClass(kCipFileObjectClassCode);
CipInstance *instances = class->instances; /* pointer to first instance */
while (NULL != instances) /* as long as pointer in not NULL */
{
EncodeCipUint(&instances->instance_number, outgoing_message);
CipAttributeStruct *instance_name = GetCipAttribute(instances, 2);
EncodeCipStringI( (CipStringIStruct *) instance_name->data,
outgoing_message );
CipAttributeStruct *file_name = GetCipAttribute(instances, 4);
EncodeCipStringI( (CipStringIStruct *) file_name->data, outgoing_message );
instances = instances->next;
}
}
void GenerateResponseHeader(
const CipFileInitiateGeneralStatusCode general_status,
const CipUsint additional_status_size,
const CipUint additional_status_code,
const CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response) {
InitializeENIPMessage(&message_router_response->message);
message_router_response->reply_service =
(0x80 | message_router_request->service);
message_router_response->general_status = general_status;
message_router_response->additional_status[0] = additional_status_code;
message_router_response->size_of_additional_status = additional_status_size;
}
static CipFileObjectValues *CipFileObjectGetDataStruct(
const CipInstance *RESTRICT const instance) {
return instance->data;
}
CipUint CipFileCalculateChecksumFromArray(const CipUdint file_size,
const CipOctet *file_content) {
CipUint checksum = 0;
for(size_t i = 0; i < file_size; ++i) {
checksum += file_content[i];
}
return (CipUint) (0x10000UL - (CipUdint) checksum);
}
CipUint CipFileCalculateChecksumFromFile(const CipUdint file_size,
FILE *file_handle) {
CipUint checksum = 0;
for(size_t i = 0; i < file_size; ++i) {
CipOctet byte = 0;
if( 1 != fread(&byte, sizeof(CipOctet), 1, file_handle) ) {
OPENER_TRACE_ERR("File read error in checksum creation!\n");
}
checksum += byte;
}
return (CipUint) (0x10000UL - (CipUdint) checksum);
}
static CipFileObjectState InitiateUpload(CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response)
{
CipFileObjectUploadSession *upload_session = CipFileGetUnusedUploadSession();
if(NULL == upload_session) {
message_router_response->general_status = kCipErrorResourceUnavailable;
message_router_response->size_of_additional_status = 0;
message_router_response->additional_status[0] = 0;
return kCipFileObjectStateFileLoaded;
}
CipUsint client_maximum_transfer_size = GetUsintFromMessage(
&message_router_request->data);
CipUsint chosen_transfer_size = (client_maximum_transfer_size <
CIP_FILE_OBJECT_MAXIMUM_TRANSFER_SIZE) ?
client_maximum_transfer_size :
CIP_FILE_OBJECT_MAXIMUM_TRANSFER_SIZE;
CipAttributeStruct *file_size_attribute = GetCipAttribute(instance, 6);
CipUdint *file_size = (CipUdint *) file_size_attribute->data;
EncodeCipUdint(file_size, &message_router_response->message);
EncodeCipUsint(&chosen_transfer_size, &message_router_response->message);
CipFileObjectValues *const struct_to_instance = CipFileObjectGetDataStruct(
instance);
OPENER_ASSERT(NULL != struct_to_instance);
rewind(struct_to_instance->file_handle);
upload_session->negotiated_transfer_size = chosen_transfer_size;
upload_session->transfer_number = 0;
if(0U == client_maximum_transfer_size) {
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->size_of_additional_status = 1;
message_router_response->additional_status[0] =
kCipFileInitiateExtendedStatusFailOnTransferZeroSize;
CipFileReleaseUploadSession(struct_to_instance);
return kCipFileObjectStateFileLoaded;
}
CipFileTakeUploadSession(struct_to_instance, upload_session);
return kCipFileObjectStateTransferUploadInitiated;
}
static CipFileObjectState TransferUploadFromInitiateUpload(
CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response) {
CipFileObjectValues *const struct_to_instance = CipFileObjectGetDataStruct(
instance);
OPENER_ASSERT(NULL != struct_to_instance);
CipFileObjectUploadSession *upload_session =
struct_to_instance->aquired_session;
CipUsint received_transfer_number = GetSintFromMessage(
&message_router_request->data);
if(0 != received_transfer_number) {
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->size_of_additional_status = 1;
message_router_response->additional_status[0] =
kCipFileTransferExtendedStatusFailOnTransferOutOfSequence;
return kCipFileObjectStateTransferUploadInProgress;
}
CipFileResetTimeout(upload_session);
EncodeCipUsint(&received_transfer_number, &message_router_response->message);
upload_session->transfer_number = 1; // Had to start with 0, so the next must be 1
CipUsint transfer_packet_type = kCipFileTransferPacketTypeFirstTransferPacket;
CipOctet data_to_send[CIP_FILE_OBJECT_MAXIMUM_TRANSFER_SIZE] = { 0 };
CipUsint negotiated_transfer_size = upload_session->negotiated_transfer_size;
const size_t data_send_length = fread(data_to_send,
sizeof(CipOctet),
negotiated_transfer_size,
struct_to_instance->file_handle);
if( ferror(struct_to_instance->file_handle) ) {
perror("Error occurred in TransferUploadFromInitiateUpload");
}
if(negotiated_transfer_size > data_send_length) {
transfer_packet_type = kCipFileTransferPacketTypeFirstAndLastPacket;
}
EncodeCipUsint(&transfer_packet_type, &message_router_response->message);
memcpy(message_router_response->message.current_message_position,
data_to_send,
data_send_length);
message_router_response->message.current_message_position += data_send_length;
message_router_response->message.used_message_length += data_send_length;
if(kCipFileTransferPacketTypeFirstAndLastPacket == transfer_packet_type) {
EncodeCipUint(&struct_to_instance->file_checksum,
&message_router_response->message);
rewind(struct_to_instance->file_handle);
CipFileReleaseUploadSession(struct_to_instance);
return kCipFileObjectStateFileLoaded;
}
return kCipFileObjectStateTransferUploadInProgress;
}
static CipFileObjectState TransferUpload(CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response)
{
CipFileObjectValues *struct_to_instance =
CipFileObjectGetDataStruct(instance);
OPENER_ASSERT(NULL != struct_to_instance);
CipFileObjectUploadSession *upload_session =
struct_to_instance->aquired_session;
CipUsint received_transfer_number = GetSintFromMessage(
&message_router_request->data);
if(upload_session->transfer_number != received_transfer_number &&
upload_session->transfer_number - 1 != received_transfer_number) {
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->size_of_additional_status = 1;
message_router_response->additional_status[0] =
kCipFileTransferExtendedStatusFailOnTransferOutOfSequence;
return kCipFileObjectStateTransferUploadInProgress;
}
CipFileResetTimeout(upload_session); //Only update on correct sequence number
if(upload_session->transfer_number - 1 == received_transfer_number) {
upload_session->transfer_number--;
fseek(struct_to_instance->file_handle,
-1 * (long) upload_session->last_send_size,
SEEK_CUR);
}
EncodeCipUsint(&received_transfer_number, &message_router_response->message);
CipUsint transfer_packet_type = (
upload_session->transfer_number !=
0 ? kCipFileTransferPacketTypeMiddleTransferPacket :
kCipFileTransferPacketTypeFirstTransferPacket);
CipOctet data_to_send[CIP_FILE_OBJECT_MAXIMUM_TRANSFER_SIZE] = { 0 };
CipUsint negotiated_transfer_size = upload_session->negotiated_transfer_size;
const size_t data_send_length = fread(data_to_send,
sizeof(CipOctet),
negotiated_transfer_size,
struct_to_instance->file_handle);
upload_session->last_send_size = data_send_length;
if(negotiated_transfer_size > data_send_length) {
transfer_packet_type = kCipFileTransferPacketTypeLastTransferPacket;
}
EncodeCipUsint(&transfer_packet_type, &message_router_response->message);
memcpy(message_router_response->message.current_message_position,
data_to_send,
data_send_length);
message_router_response->message.current_message_position += data_send_length;
message_router_response->message.used_message_length += data_send_length;
if(kCipFileTransferPacketTypeLastTransferPacket == transfer_packet_type) {
OPENER_TRACE_INFO("Last transfer packet\n");
EncodeCipUint(&struct_to_instance->file_checksum,
&message_router_response->message);
rewind(struct_to_instance->file_handle);
CipFileReleaseUploadSession(struct_to_instance);
return kCipFileObjectStateFileLoaded;
}
upload_session->transfer_number++;
return kCipFileObjectStateTransferUploadInProgress;
}
EipStatus CipFileInitiateUpload(CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response,
const struct sockaddr *originator_address,
const int encapsulation_session) {
CipAttributeStruct *state_attribute = GetCipAttribute(instance, 1);
CipUsint *state = (CipUsint *) state_attribute->data;
switch(*state) {
case kCipFileObjectStateNonExistent:
GenerateResponseHeader(kCipErrorObjectDoesNotExist,
0,
0,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateFileEmpty:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferDownloadInitiated:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferDownloadInProgress:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateStoring:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateFileLoaded:
/* Insert Happy Path */
GenerateResponseHeader(kCipErrorSuccess,
0,
0,
message_router_request,
message_router_response);
*state = InitiateUpload(instance,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferUploadInitiated:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferUploadInProgress:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
default:
OPENER_TRACE_ERR("Unknown state %d in File Object instance: %d",
*state,
instance->instance_number);
OPENER_ASSERT(false);
break;
}
return kEipStatusOkSend;
}
EipStatus CipFileUploadTransfer(CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response,
const struct sockaddr *originator_address,
const int encapsulation_session) {
CipAttributeStruct *state_attribute = GetCipAttribute(instance, 1);
CipUsint *state = (CipUsint *) state_attribute->data;
switch(*state) {
case kCipFileObjectStateNonExistent:
GenerateResponseHeader(kCipErrorObjectDoesNotExist,
0,
0,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateFileEmpty:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferDownloadInitiated:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferDownloadInProgress:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateStoring:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateFileLoaded:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferUploadInitiated:
/* Insert Happy Path */
GenerateResponseHeader(kCipErrorSuccess,
0,
0,
message_router_request,
message_router_response);
*state = TransferUploadFromInitiateUpload(instance,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferUploadInProgress:
/* Insert Happy Path */
GenerateResponseHeader(kCipErrorSuccess,
0,
0,
message_router_request,
message_router_response);
*state = TransferUpload(instance,
message_router_request,
message_router_response);
break;
default:
OPENER_TRACE_ERR("Unknown state %d in File Object instance: %d",
*state,
instance->instance_number);
OPENER_ASSERT(false);
break;
}
return kEipStatusOkSend;
}
static CipFileObjectState InitiateDownload(CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response)
{
/* received parameters */
download_sessions[0].file_size = GetUdintFromMessage(
&message_router_request->data);
download_sessions[0].file_format_version = GetUintFromMessage(
&message_router_request->data);
download_sessions[0].file_revision.major_revision = GetUsintFromMessage(
&message_router_request->data);
download_sessions[0].file_revision.minor_revision = GetUsintFromMessage(
&message_router_request->data);
//get filename from message
CipStringIDecodeFromMessage(&download_sessions[0].file_name,
message_router_request);
/* Check for errors */
if(CIP_FILE_MAX_TRANSFERABLE_SIZE < download_sessions[0].file_size) {
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->size_of_additional_status = 1;
message_router_response->additional_status[0] =
kCipFileInitiateExtendedStatusFileSizeTooLarge;
return kCipFileObjectStateFileEmpty;
}
if(1 > download_sessions[0].file_format_version ||
1 < download_sessions[0].file_format_version) {
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->size_of_additional_status = 1;
message_router_response->additional_status[0] =
kCipFileInitiateExtendedStatusFileFormatVersionNotCompatible;
return kCipFileObjectStateFileEmpty;
}
if( 0 == download_sessions[0].file_name.number_of_strings ||
CipStringIsAnyStringEmpty( &(download_sessions[0].file_name) ) ) {
OPENER_TRACE_INFO("Number of strings: %d\n",
download_sessions[0].file_name.number_of_strings);
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->size_of_additional_status = 1;
message_router_response->additional_status[0] =
kCipFileInitiateExtendedStatusFileNameEmpty;
return kCipFileObjectStateFileEmpty;
}
/* Checks done */
/* returned parameters */
CipUdint incremental_burn = 0;
CipUint incremetal_burn_time = 0;
CipUsint transfer_size = CIP_FILE_OBJECT_MAXIMUM_TRANSFER_SIZE;
EncodeCipUdint(&incremental_burn, &message_router_response->message);
EncodeCipUint(&incremetal_burn_time, &message_router_response->message);
EncodeCipUsint(&transfer_size, &message_router_response->message);
return kCipFileObjectStateTransferDownloadInitiated;
}
EipStatus CipFileResetDownloadTransferSession(
CipFileDownloadSession *const session) {
session->file_format_version = 0;
session->file_revision.major_revision = 0;
session->file_revision.minor_revision = 0;
session->file_size = 0;
CipStringIDelete(&session->file_name);
session->current_data_position = session->data;
session->transfer_number = 0;
memset(session->data, 0, CIP_FILE_MAX_TRANSFERABLE_SIZE);
return kEipStatusOk;
}
static CipFileObjectState TransferDownloadFromInitiateDownload(
CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response) {
/* Get transfer number and packet type*/
CipUsint transfer_number = GetUsintFromMessage(&message_router_request->data);
CipUsint transfer_packet_type = GetUsintFromMessage(
&message_router_request->data);
if(kCipFileTransferPacketTypeAbortTransfer == transfer_packet_type) {
CipFileResetDownloadTransferSession(&download_sessions[0]);
message_router_response->general_status = kCipErrorSuccess;
EncodeCipUsint(&transfer_number, &message_router_response->message);
return kCipFileObjectStateFileEmpty;
}
/* If middle or last packet type, return error, as this is not possible here */
if(kCipFileTransferPacketTypeMiddleTransferPacket == transfer_packet_type ||
kCipFileTransferPacketTypeLastTransferPacket == transfer_packet_type) {
OPENER_TRACE_ERR(
"CIP File: On switch from InitiateDownload to Download Transfer, first packet expected but not received\n");
message_router_response->general_status = kCipErrorObjectStateConflict;
message_router_response->size_of_additional_status = 1;
CipAttributeStruct *state_attribute = GetCipAttribute(instance, 1);
CipUsint *state = (CipUsint *) state_attribute->data;
message_router_response->additional_status[0] = *state;
return kCipFileObjectStateTransferDownloadInitiated;
}
/* If the transfer number is not zero, return error. This has to be the first packet */
if(0 != transfer_number) {
OPENER_TRACE_ERR(
"CIP File: On switch from InitiateDownload to Download Transfer, transfer number 0 expected, but not received\n");
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->additional_status[0] =
kCipFileTransferExtendedStatusFailOnTransferOutOfSequence;
message_router_response->size_of_additional_status = 1;
return kCipFileObjectStateTransferDownloadInitiated;
}
/* Calculate payload length */
size_t payload_length = message_router_request->request_data_size -
sizeof(CipUsint) - sizeof(CipUsint)
- (kCipFileTransferPacketTypeFirstAndLastPacket ==
transfer_packet_type ? sizeof(CipUint) : 0);
if(CIP_FILE_OBJECT_MAXIMUM_TRANSFER_SIZE < payload_length) { /* payload has to be smaller than maximum transfer size */
OPENER_TRACE_ERR("CIP File: Payload greater than maximum transfer size\n");
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->additional_status[0] =
kCipFileInitiateExtendedStatusFileSizeTooLarge;
message_router_response->size_of_additional_status = 1;
EncodeCipUsint(&transfer_number, &message_router_response->message);
return kCipFileObjectStateFileEmpty;
}
if(kCipFileTransferPacketTypeFirstAndLastPacket == transfer_packet_type) {
//size_t data_payload_length = payload_length - sizeof(CipUint); /* Last 16-bits are checksum */
const CipUint calculated_checksum = CipFileCalculateChecksumFromArray(
payload_length,
message_router_request->data);
const CipUint received_checksum =
*(CipUint *) (message_router_request->data + payload_length);
EncodeCipUsint(&transfer_number, &message_router_response->message);
if(calculated_checksum != received_checksum) {
message_router_response->general_status =
kCipFileTransferGeneralStatusFailOnChecksum;
CipFileResetDownloadTransferSession(&download_sessions[0]);
return kCipFileObjectStateFileEmpty;
}
memcpy(download_sessions[0].data,
message_router_request->data,
payload_length);
return kCipFileObjectStateStoring;
}
if(kCipFileTransferPacketTypeFirstTransferPacket == transfer_packet_type) {
size_t data_payload_length = payload_length; /* No checksum */
memcpy(download_sessions[0].current_data_position,
message_router_request->data,
data_payload_length);
download_sessions[0].current_data_position += data_payload_length;
EncodeCipUsint(&transfer_number, &message_router_response->message);
return kCipFileObjectStateTransferDownloadInProgress;
}
return kCipFileObjectStateTransferDownloadInitiated;
}
static CipFileObjectState TransferDownload(CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response)
{
/* Get transfer number and packet type*/
CipUsint transfer_number = GetUsintFromMessage(&message_router_request->data);
CipUsint transfer_packet_type = GetUsintFromMessage(
&message_router_request->data);
if(kCipFileTransferPacketTypeAbortTransfer == transfer_packet_type) {
CipFileResetDownloadTransferSession(&download_sessions[0]);
message_router_response->general_status = kCipErrorSuccess;
EncodeCipUsint(&transfer_number, &message_router_response->message);
return kCipFileObjectStateFileEmpty;
}
/* First Packet has already been processed in TransferDownloadFromInitiateDownload */
if(kCipFileTransferPacketTypeFirstTransferPacket == transfer_packet_type ||
kCipFileTransferPacketTypeFirstAndLastPacket == transfer_packet_type) {
message_router_response->general_status = kCipErrorObjectStateConflict;
message_router_response->size_of_additional_status = 1;
CipAttributeStruct *state_attribute = GetCipAttribute(instance, 1);
CipUsint *state = (CipUsint *) state_attribute->data;
message_router_response->additional_status[0] = *state;
return kCipFileObjectStateTransferDownloadInProgress;
}
/* If the transfer number is not zero, return error. This has to be the first packet */
if(download_sessions[0].transfer_number + 1 != transfer_number) {
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->size_of_additional_status = 1;
if(download_sessions[0].transfer_number == transfer_number) {
message_router_response->additional_status[0] =
kCipFileTransferExtendedStatusFailOnTransferDuplicate;
} else {
message_router_response->additional_status[0] =
kCipFileTransferExtendedStatusFailOnTransferOutOfSequence;
}
return kCipFileObjectStateTransferDownloadInProgress;
}
/* transfer number ok */
download_sessions[0].transfer_number = transfer_number;
/* Calculate payload length */
size_t payload_length = message_router_request->request_data_size -
sizeof(CipUsint) - sizeof(CipUsint);
if(CIP_FILE_OBJECT_MAXIMUM_TRANSFER_SIZE < payload_length) { /* payload has to be smaller than maximum transfer size */
message_router_response->general_status = kCipErrorInvalidParameter;
message_router_response->additional_status[0] =
kCipFileInitiateExtendedStatusFileSizeTooLarge;
message_router_response->size_of_additional_status = 1;
EncodeCipUsint(&transfer_number, &message_router_response->message);
return kCipFileObjectStateFileEmpty;
}
if(kCipFileTransferPacketTypeMiddleTransferPacket == transfer_packet_type) {
size_t data_payload_length = payload_length; /* No checksum */
memcpy(download_sessions[0].current_data_position,
message_router_request->data,
data_payload_length);
download_sessions[0].current_data_position += data_payload_length;
EncodeCipUsint(&transfer_number, &message_router_response->message);
return kCipFileObjectStateTransferDownloadInProgress;
}
if(kCipFileTransferPacketTypeLastTransferPacket == transfer_packet_type) {
size_t data_payload_length = payload_length - sizeof(CipUint); /* Last 16-bits are checksum */
/* Get last bits of data */
memcpy(download_sessions[0].current_data_position,
message_router_request->data,
data_payload_length);
download_sessions[0].current_data_position += data_payload_length;
EncodeCipUsint(&transfer_number, &message_router_response->message);
/* Calculate checksum */
const CipUint calculated_checksum = CipFileCalculateChecksumFromArray(
download_sessions[0].current_data_position - download_sessions[0].data,
download_sessions[
0].data);
const CipUint received_checksum =
*(CipUint *) (message_router_request->data + data_payload_length);
OPENER_TRACE_INFO(
"Download Transfer calculated checksum: %x - received checksum: %x\n",
calculated_checksum,
received_checksum);
if(calculated_checksum != received_checksum) {
message_router_response->general_status =
kCipFileTransferGeneralStatusFailOnChecksum;
CipFileResetDownloadTransferSession(&download_sessions[0]);
return kCipFileObjectStateFileEmpty;
}
/* Currently no save to non-volatile storage */
return kCipFileObjectStateStoring;
}
return kCipFileObjectStateTransferDownloadInProgress; //TODO: What to do if nothing matches? Check this again
}
static CipFileObjectState CipFileStore(CipInstance *RESTRICT const instance) {
OPENER_TRACE_INFO("CIP File: Storing instance %d\n",
instance->instance_number);
CipFileObjectValues *struct_to_instance;
if( NULL == ( struct_to_instance = CipFileObjectGetDataStruct(instance) ) ) {
/*No entry found - not possible as instance was found */
OPENER_ASSERT(false);
}
/* copy data to file object instance*/
struct_to_instance->file_size = download_sessions[0].file_size;
memcpy(struct_to_instance->data,
download_sessions[0].data,
struct_to_instance->file_size);
struct_to_instance->file_format_version =
download_sessions[0].file_format_version;
struct_to_instance->file_revision.major_revision =
download_sessions[0].file_revision.major_revision;
struct_to_instance->file_revision.minor_revision =
download_sessions[0].file_revision.minor_revision;
struct_to_instance->file_checksum = CipFileCalculateChecksumFromArray(
struct_to_instance->file_size,
struct_to_instance->data);
CipStringIDelete(&struct_to_instance->file_name);
CipStringICopy(&struct_to_instance->file_name,
&download_sessions[0].file_name);
return kCipFileObjectStateFileLoaded;
}
EipStatus CipFileInitiateDownload(CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response,
const struct sockaddr *originator_address,
const int encapsulation_session) {
CipFileObjectValues *struct_to_instance;
if( NULL == ( struct_to_instance = CipFileObjectGetDataStruct(instance) ) ) {
/*No entry found - not possible as instance was found */
OPENER_ASSERT(false);
}
return struct_to_instance->initiate_download(instance,
message_router_request,
message_router_response,
originator_address,
encapsulation_session);
}
EipStatus CipFileInitiateDownloadImplementation(
CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response,
const struct sockaddr *originator_address,
const int encapsulation_session) {
CipAttributeStruct *file_access_attribute = GetCipAttribute(instance, 10);
CipAttributeStruct *state_attribute = GetCipAttribute(instance, 1);
CipUsint *state = (CipUsint *) state_attribute->data;
if(kCipFileObjectFileAccessRuleReadOnly ==
*(CipUsint *) file_access_attribute->data) {
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
return kEipStatusOkSend;
}
switch(*state) {
case kCipFileObjectStateNonExistent:
GenerateResponseHeader(kCipErrorObjectDoesNotExist,
0,
0,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateFileEmpty:
GenerateResponseHeader(kCipErrorSuccess,
0,
0,
message_router_request,
message_router_response);
*state = InitiateDownload(instance,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferDownloadInitiated:
/* File object in invalid state for this operation */
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferDownloadInProgress:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateStoring:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateFileLoaded:
/* Insert Happy Path */
GenerateResponseHeader(kCipErrorSuccess,
1,
*state,
message_router_request,
message_router_response);
CipFileResetDownloadTransferSession(&download_sessions[0]);
//*state = ClearFileDataAndAttrributes();
*state = InitiateDownload(instance,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferUploadInitiated:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
case kCipFileObjectStateTransferUploadInProgress:
GenerateResponseHeader(kCipErrorObjectStateConflict,
1,
*state,
message_router_request,
message_router_response);
break;
default:
OPENER_TRACE_ERR("Unknown state %d in File Object instance: %d",
*state,
instance->instance_number);
OPENER_ASSERT(false);
break;
}
return kEipStatusOkSend;
}
EipStatus CipFileDownloadTransfer(CipInstance *RESTRICT const instance,
CipMessageRouterRequest *const message_router_request,
CipMessageRouterResponse *const message_router_response,
const struct sockaddr *originator_address,
const int encapsulation_session) {
CipFileObjectValues *struct_to_instance;
if( NULL == ( struct_to_instance = CipFileObjectGetDataStruct(instance) ) ) {
/*No entry found - not possible as instance was found */