int BER_ENCODE_CTYPE_INT8(unsigned char *buf, CTYPE_INT8 *value) {
CTYPE_INT16U offset = 0;
CTYPE_INT16U len = BER_GET_LENGTH_CTYPE_INT8(value);
buf[offset++] = ASN1_TAG_INTEGER;
offset += encodeLength(&buf[offset], len);
#if GOOSE_FIXED_SIZE == 1
ber_encode_integer_fixed_size(&buf[offset], value, SV_GET_LENGTH_INT8);
#else
ber_encode_integer(&buf[offset], value, SV_GET_LENGTH_INT8);
#endif
return offset + len;
}
int BER_ENCODE_CTYPE_ENUM(unsigned char *buf, CTYPE_ENUM *value) {
CTYPE_INT16U offset = 0;
CTYPE_INT16U len = BER_GET_LENGTH_CTYPE_ENUM(value);
buf[offset++] = ASN1_TAG_INTEGER;
offset += encodeLength(&buf[offset], len);
#if GOOSE_FIXED_SIZE == 1
ber_encode_integer_fixed_size(&buf[offset], value, SV_GET_LENGTH_INT8);
#else
ber_encode_integer(&buf[offset], value, SV_GET_LENGTH_INT32U); // assuming enum is an int - allows any enum type to be used
#endif
return offset + len;
}
// creates a GSE packet, including frame header. returns 0 on fail; number of bytes on success
int gseEncodePacket(struct gseControl *gseControl, unsigned char *buf) {
int offset = 0;
int size = 0;
int ADPULength = getGseHeaderLength(gseControl);
int len = ADPULength + 9 + getLengthBytes(ADPULength); // APDU tag size (1 byte), plus 8 "header" bytes
//printf("ADPULength: %i, len: %i\n", ADPULength, len);
// frame header
memcpy(&buf[offset], gseControl->ethHeaderData.destMACAddress, 6); // destination MAC addresses
offset += 6;
memcpy(&buf[offset], LOCAL_MAC_ADDRESS, 6); // source MAC addresses
offset += 6;
buf[offset++] = 0x81; // TPID
buf[offset++] = 0x00;
netmemcpy(&buf[offset], &gseControl->ethHeaderData.VLAN_ID, 2); // TCI
buf[offset] |= (gseControl->ethHeaderData.VLAN_PRIORITY << 5);
offset += 2;
buf[offset++] = 0x88; // EtherType
buf[offset++] = 0xB8;
netmemcpy(&buf[offset], &gseControl->ethHeaderData.APPID, 2); // APPID
offset += 2;
netmemcpy(&buf[offset], &len, 2); // length
offset += 2;
buf[offset++] = 0x00; // reserved 1
buf[offset++] = 0x00;
buf[offset++] = 0x00; // reserved 2
buf[offset++] = 0x00;
buf[offset++] = ASN1_TAG_SEQUENCE;
offset += encodeLength(&buf[offset], ADPULength /*+ getLengthBytes(ADPULength) + 1*/);
buf[offset++] = GSE_TAG_GOCBREF;
size = strlen((const char *) gseControl->gocbRef);
buf[offset++] = size;
memcpy(&buf[offset], gseControl->gocbRef, size);
offset += size;
buf[offset++] = GSE_TAG_TIME_ALLOWED_TO_LIVE;
offset += encodeLength(&buf[offset], BER_GET_LENGTH_CTYPE_INT32U(&gseControl->timeAllowedToLive));
#if GOOSE_FIXED_SIZE == 1
offset += ber_encode_integer_fixed_size(&buf[offset], &gseControl->timeAllowedToLive, SV_GET_LENGTH_INT32U);
#else
offset += ber_encode_integer(&buf[offset], &gseControl->timeAllowedToLive, SV_GET_LENGTH_INT32U);
#endif
buf[offset++] = GSE_TAG_DATSET;
size = strlen((const char *) gseControl->datSet);
buf[offset++] = size;
memcpy(&buf[offset], gseControl->datSet, size);
offset += size;
buf[offset++] = GSE_TAG_GOID;
size = strlen((const char *) gseControl->goID);
buf[offset++] = size;
memcpy(&buf[offset], gseControl->goID, size);
offset += size;
buf[offset++] = GSE_TAG_T;
offset += encodeLength(&buf[offset], BER_GET_LENGTH_CTYPE_TIMESTAMP(&gseControl->t));
setTimestamp(&gseControl->t);
memcpy(&buf[offset], &gseControl->t, BER_GET_LENGTH_CTYPE_TIMESTAMP(&gseControl->t));
offset += BER_GET_LENGTH_CTYPE_TIMESTAMP(&gseControl->t);
buf[offset++] = GSE_TAG_STNUM;
offset += encodeLength(&buf[offset], BER_GET_LENGTH_CTYPE_INT32U(&gseControl->stNum));
#if GOOSE_FIXED_SIZE == 1
offset += ber_encode_integer_fixed_size(&buf[offset], &gseControl->stNum, SV_GET_LENGTH_INT32U);
#else
offset += ber_encode_integer(&buf[offset], &gseControl->stNum, SV_GET_LENGTH_INT32U);
#endif
buf[offset++] = GSE_TAG_SQNUM;
offset += encodeLength(&buf[offset], BER_GET_LENGTH_CTYPE_INT32U(&gseControl->sqNum));
#if GOOSE_FIXED_SIZE == 1
offset += ber_encode_integer_fixed_size(&buf[offset], &gseControl->sqNum, SV_GET_LENGTH_INT32U);
#else
offset += ber_encode_integer(&buf[offset], &gseControl->sqNum, SV_GET_LENGTH_INT32U);
#endif
buf[offset++] = GSE_TAG_SIMULATION;
offset += encodeLength(&buf[offset], BER_GET_LENGTH_CTYPE_BOOLEAN(&gseControl->test));
offset += ber_encode_integer(&buf[offset], &gseControl->test, SV_GET_LENGTH_BOOLEAN);
buf[offset++] = GSE_TAG_CONFREV;
offset += encodeLength(&buf[offset], BER_GET_LENGTH_CTYPE_INT32U(&gseControl->confRev));
#if GOOSE_FIXED_SIZE == 1
offset += ber_encode_integer_fixed_size(&buf[offset], &gseControl->confRev, SV_GET_LENGTH_INT32U);
#else
offset += ber_encode_integer(&buf[offset], &gseControl->confRev, SV_GET_LENGTH_INT32U);
#endif
buf[offset++] = GSE_TAG_NDSCOM;
offset += encodeLength(&buf[offset], BER_GET_LENGTH_CTYPE_BOOLEAN(&gseControl->ndsCom));
offset += ber_encode_integer(&buf[offset], &gseControl->ndsCom, SV_GET_LENGTH_BOOLEAN);
buf[offset++] = GSE_TAG_NUMDATSETENTRIES;
offset += encodeLength(&buf[offset], BER_GET_LENGTH_CTYPE_INT32U(&gseControl->numDatSetEntries));
#if GOOSE_FIXED_SIZE == 1
offset += ber_encode_integer_fixed_size(&buf[offset], &gseControl->numDatSetEntries, SV_GET_LENGTH_INT32U);
#else
offset += ber_encode_integer(&buf[offset], &gseControl->numDatSetEntries, SV_GET_LENGTH_INT32U);
#endif
buf[offset++] = GSE_TAG_ALLDATA;
offset += encodeLength(&buf[offset], (gseControl->getDatasetLength)());
offset += (gseControl->encodeDataset)(&buf[offset]);
// assume network interface, such as WinPcap, generates CRC bytes
return offset;
}
