Diff: rapid61850/gseEncodePacket.c

Revision:

0:f09b7bb8bcce

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rapid61850/gseEncodePacket.c	Tue Oct 02 21:31:05 2012 +0000
@@ -0,0 +1,187 @@
+/**
+ * Rapid-prototyping protection schemes with IEC 61850
+ *
+ * Copyright (c) 2012 Steven Blair
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include "encodePacket.h"
+#include "gsePacketData.h"
+#include "gseEncode.h"
+#include "svEncode.h"
+
+int getGseHeaderLength(struct gseControl *gseControl) {
+    int size = 0;
+    int len = 0;
+
+    size = strlen((const char *) gseControl->gocbRef);
+    len += size + getLengthBytes(size) + 1;
+
+    size = BER_GET_LENGTH_CTYPE_INT32U(&gseControl->timeAllowedToLive);
+    len += size + getLengthBytes(size) + 1;
+
+    size = strlen((const char *) gseControl->datSet);
+    len += size + getLengthBytes(size) + 1;
+
+    size = strlen((const char *) gseControl->goID);
+    len += size + getLengthBytes(size) + 1;
+
+    size = BER_GET_LENGTH_CTYPE_TIMESTAMP(&gseControl->t);
+    len += size + getLengthBytes(size) + 1;
+
+    size = BER_GET_LENGTH_CTYPE_INT32U(&gseControl->stNum);
+    len += size + getLengthBytes(size) + 1;
+
+    size = BER_GET_LENGTH_CTYPE_INT32U(&gseControl->sqNum);
+    len += size + getLengthBytes(size) + 1;
+
+    size = BER_GET_LENGTH_CTYPE_BOOLEAN(&gseControl->test);
+    len += size + getLengthBytes(size) + 1;
+
+    size = BER_GET_LENGTH_CTYPE_INT32U(&gseControl->confRev);
+    len += size + getLengthBytes(size) + 1;
+
+    size = BER_GET_LENGTH_CTYPE_BOOLEAN(&gseControl->ndsCom);
+    len += size + getLengthBytes(size) + 1;
+
+    size = BER_GET_LENGTH_CTYPE_INT32U(&gseControl->numDatSetEntries);
+    len += size + getLengthBytes(size) + 1;
+
+    size = (gseControl->getDatasetLength)();
+    len += size + getLengthBytes(size) + 1;
+
+    return 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;
+}