mohamed rahil | e04626f | 2016-04-05 20:42:53 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2016 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.isis.io.util; |
| 17 | |
| 18 | |
| 19 | import com.google.common.base.MoreObjects; |
| 20 | import com.google.common.primitives.Bytes; |
| 21 | import org.onosproject.isis.io.isispacket.tlv.PaddingTlv; |
| 22 | import org.onosproject.isis.io.isispacket.tlv.TlvHeader; |
| 23 | |
| 24 | import javax.xml.bind.DatatypeConverter; |
| 25 | import java.util.ArrayList; |
| 26 | import java.util.List; |
| 27 | import java.util.StringTokenizer; |
| 28 | |
| 29 | /** |
| 30 | * Represents ISIS utils. |
| 31 | */ |
| 32 | public final class IsisUtil { |
| 33 | public static final int AREAADDRESS = 1; |
| 34 | public static final int ISREACHABILITY = 2; |
| 35 | public static final int ISNEIGHBORS = 6; |
| 36 | public static final int PADDING = 8; |
| 37 | public static final int LSPENTRY = 9; |
| 38 | public static final int AUTHENTICATION = 10; |
| 39 | public static final int CHECKSUM = 12; |
| 40 | public static final int EXTENDEDISREACHABILITY = 22; |
| 41 | public static final int ISALIAS = 24; |
| 42 | public static final int IPINTERNALREACHABILITY = 128; |
| 43 | public static final int PROTOCOLSUPPORTED = 129; |
| 44 | public static final int IPEXTERNALREACHABILITY = 130; |
| 45 | public static final int IDRPINFORMATION = 131; |
| 46 | public static final int IPINTERFACEADDRESS = 132; |
| 47 | public static final int L1HELLOPDU = 1; |
| 48 | public static final int L2HELLOPDU = 2; |
| 49 | public static final int P2PHELLOPDU = 3; |
| 50 | public static final int L1LSPDU = 18; |
| 51 | public static final int L2LSPDU = 20; |
| 52 | public static final int L1CSNP = 24; |
| 53 | public static final int L2CSNP = 25; |
| 54 | public static final int L1PSNP = 26; |
| 55 | public static final int L2PSNP = 27; |
| 56 | public static final int L1L2_LS_PDUHEADERLENGTH = 27; |
| 57 | public static final int P2PPDUHEADERLENGTH = 20; |
| 58 | public static final int PSNPPDUHEADERLENGTH = 17; |
| 59 | public static final char ETHER_FRAME_LEN = 1514; |
| 60 | public static final int ID_SIX_BYTES = 6; |
| 61 | public static final int ID_PLUS_ONE_BYTE = 7; |
| 62 | public static final int ID_PLUS_TWO_BYTE = 8; |
| 63 | public static final int THREE_BYTES = 3; |
| 64 | public static final int SIX_BYTES = 6; |
| 65 | public static final int FOUR_BYTES = 4; |
| 66 | public static final int PADDING_FIXED_LENGTH = 255; |
| 67 | |
| 68 | /** |
| 69 | * Creates an instance of this class. |
| 70 | */ |
| 71 | private IsisUtil() { |
| 72 | |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Parse byte array to string system ID. |
| 77 | * |
| 78 | * @param bytes system ID |
| 79 | * @return systemId system ID. |
| 80 | */ |
| 81 | public static String systemId(byte[] bytes) { |
| 82 | String systemId = ""; |
| 83 | for (Byte byt : bytes) { |
| 84 | String hexa = Integer.toHexString(Byte.toUnsignedInt(byt)); |
| 85 | if (hexa.length() % 2 != 0) { |
| 86 | hexa = "0" + hexa; |
| 87 | } |
| 88 | systemId = systemId + hexa; |
| 89 | if (systemId.length() == 4 || systemId.length() == 9) { |
| 90 | systemId = systemId + "."; |
| 91 | } |
| 92 | } |
| 93 | return systemId; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Parse byte array to LAN ID. |
| 98 | * |
| 99 | * @param bytes LAN ID |
| 100 | * @return systemId system ID. |
| 101 | */ |
| 102 | public static String systemIdPlus(byte[] bytes) { |
| 103 | String systemId = ""; |
| 104 | for (Byte byt : bytes) { |
| 105 | String hexa = Integer.toHexString(Byte.toUnsignedInt(byt)); |
| 106 | if (hexa.length() % 2 != 0) { |
| 107 | hexa = "0" + hexa; |
| 108 | } |
| 109 | systemId = systemId + hexa; |
| 110 | if (systemId.length() == 4 || systemId.length() == 9 |
| 111 | || systemId.length() == 14) { |
| 112 | systemId = systemId + "."; |
| 113 | } |
| 114 | } |
| 115 | return systemId; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Parse byte array to area address. |
| 120 | * |
| 121 | * @param bytes area address |
| 122 | * @return areaAddress area address |
| 123 | */ |
| 124 | public static String areaAddres(byte[] bytes) { |
| 125 | int count = 0; |
| 126 | String areaAddress = ""; |
| 127 | for (Byte byt : bytes) { |
| 128 | String hexa = Integer.toHexString(Byte.toUnsignedInt(byt)); |
| 129 | if (hexa.length() % 2 != 0) { |
| 130 | hexa = "0" + hexa; |
| 131 | } |
| 132 | if (count == 0) { |
| 133 | hexa = hexa + "."; |
| 134 | } |
| 135 | areaAddress = areaAddress + hexa; |
| 136 | count++; |
| 137 | } |
| 138 | return areaAddress; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Parse area address to bytes. |
| 143 | * |
| 144 | * @param address area address |
| 145 | * @return areaAddress area address |
| 146 | */ |
| 147 | public static List<Byte> areaAddresToBytes(String address) { |
| 148 | List<Byte> idLst = new ArrayList(); |
| 149 | StringTokenizer tokenizer = new StringTokenizer(address, "."); |
| 150 | int count = 0; |
| 151 | while (tokenizer.hasMoreElements()) { |
| 152 | String str = tokenizer.nextToken(); |
| 153 | if (str.length() % 2 != 0) { |
| 154 | str = "0" + str; |
| 155 | } |
| 156 | if (count > 0) { |
| 157 | |
| 158 | for (int i = 0; i < str.length(); i = i + 2) { |
| 159 | idLst.add((byte) Integer.parseInt(str.substring(i, i + 2), 16)); |
| 160 | } |
| 161 | } else { |
| 162 | idLst.add((byte) Integer.parseInt(str, 16)); |
| 163 | } |
| 164 | count++; |
| 165 | } |
| 166 | return idLst; |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Gets PDU header length. |
| 171 | * |
| 172 | * @param pduType PDU type |
| 173 | * @return headerLength header length |
| 174 | */ |
| 175 | public static int getPduHeaderLength(int pduType) { |
| 176 | int headerLength = 0; |
| 177 | switch (pduType) { |
| 178 | case L1HELLOPDU: |
| 179 | case L2HELLOPDU: |
| 180 | case L1LSPDU: |
| 181 | case L2LSPDU: |
| 182 | headerLength = L1L2_LS_PDUHEADERLENGTH; |
| 183 | break; |
| 184 | case P2PHELLOPDU: |
| 185 | headerLength = P2PPDUHEADERLENGTH; |
| 186 | break; |
| 187 | case L1PSNP: |
| 188 | case L2PSNP: |
| 189 | headerLength = PSNPPDUHEADERLENGTH; |
| 190 | break; |
| 191 | default: |
| 192 | break; |
| 193 | } |
| 194 | return headerLength; |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Parse source and LAN ID. |
| 199 | * |
| 200 | * @param id source and LAN ID |
| 201 | * @return sourceAndLanIdToBytes source and LAN ID |
| 202 | */ |
| 203 | public static List<Byte> sourceAndLanIdToBytes(String id) { |
| 204 | List<Byte> idLst = new ArrayList(); |
| 205 | |
| 206 | StringTokenizer tokenizer = new StringTokenizer(id, "."); |
| 207 | while (tokenizer.hasMoreElements()) { |
| 208 | int i = 0; |
| 209 | String str = tokenizer.nextToken(); |
| 210 | idLst.add((byte) Integer.parseInt(str.substring(0, i + 2), 16)); |
| 211 | if (str.length() > 2) { |
| 212 | idLst.add((byte) Integer.parseInt(str.substring(i + 2, str.length()), 16)); |
| 213 | } |
| 214 | |
| 215 | } |
| 216 | return idLst; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Parse padding for PDU based on current length. |
| 221 | * |
| 222 | * @param currentLength current length |
| 223 | * @return byteArray padding array |
| 224 | */ |
| 225 | public static byte[] paddingForPdu(int currentLength) { |
| 226 | List<Byte> bytes = new ArrayList<>(); |
| 227 | while (ETHER_FRAME_LEN > currentLength) { |
| 228 | int length = ETHER_FRAME_LEN - currentLength; |
| 229 | TlvHeader tlvHeader = new TlvHeader(); |
| 230 | tlvHeader.setTlvType(PADDING); |
| 231 | if (length >= PADDING_FIXED_LENGTH) { |
| 232 | tlvHeader.setTlvLength(PADDING_FIXED_LENGTH); |
| 233 | } else { |
| 234 | tlvHeader.setTlvLength(ETHER_FRAME_LEN - currentLength); |
| 235 | } |
| 236 | PaddingTlv tlv = new PaddingTlv(tlvHeader); |
| 237 | bytes.addAll(Bytes.asList(tlv.asBytes())); |
| 238 | currentLength = currentLength + tlv.tlvLength(); |
| 239 | } |
| 240 | byte[] byteArray = new byte[bytes.size()]; |
| 241 | int i = 0; |
| 242 | for (byte byt : bytes) { |
| 243 | byteArray[i++] = byt; |
| 244 | } |
| 245 | return byteArray; |
| 246 | |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * Converts an integer to two bytes. |
| 251 | * |
| 252 | * @param numberToConvert number to convert |
| 253 | * @return numInBytes given number as bytes |
| 254 | */ |
| 255 | public static byte[] convertToTwoBytes(int numberToConvert) { |
| 256 | |
| 257 | byte[] numInBytes = new byte[2]; |
| 258 | String s1 = Integer.toHexString(numberToConvert); |
| 259 | if (s1.length() % 2 != 0) { |
| 260 | s1 = "0" + s1; |
| 261 | } |
| 262 | byte[] hexas = DatatypeConverter.parseHexBinary(s1); |
| 263 | if (hexas.length == 1) { |
| 264 | numInBytes[0] = 0; |
| 265 | numInBytes[1] = hexas[0]; |
| 266 | } else { |
| 267 | numInBytes[0] = hexas[0]; |
| 268 | numInBytes[1] = hexas[1]; |
| 269 | } |
| 270 | return numInBytes; |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * Converts a number to four bytes. |
| 275 | * |
| 276 | * @param numberToConvert number to convert |
| 277 | * @return numInBytes given number as bytes |
| 278 | */ |
| 279 | public static byte[] convertToFourBytes(int numberToConvert) { |
| 280 | |
| 281 | byte[] numInBytes = new byte[4]; |
| 282 | String s1 = Integer.toHexString(numberToConvert); |
| 283 | if (s1.length() % 2 != 0) { |
| 284 | s1 = "0" + s1; |
| 285 | } |
| 286 | byte[] hexas = DatatypeConverter.parseHexBinary(s1); |
| 287 | if (hexas.length == 1) { |
| 288 | numInBytes[0] = 0; |
| 289 | numInBytes[1] = 0; |
| 290 | numInBytes[2] = 0; |
| 291 | numInBytes[3] = hexas[0]; |
| 292 | } else if (hexas.length == 2) { |
| 293 | numInBytes[0] = 0; |
| 294 | numInBytes[1] = 0; |
| 295 | numInBytes[2] = hexas[0]; |
| 296 | numInBytes[3] = hexas[1]; |
| 297 | } else if (hexas.length == 3) { |
| 298 | numInBytes[0] = 0; |
| 299 | numInBytes[1] = hexas[0]; |
| 300 | numInBytes[2] = hexas[1]; |
| 301 | numInBytes[3] = hexas[2]; |
| 302 | } else { |
| 303 | numInBytes[0] = hexas[0]; |
| 304 | numInBytes[1] = hexas[1]; |
| 305 | numInBytes[2] = hexas[2]; |
| 306 | numInBytes[3] = hexas[3]; |
| 307 | } |
| 308 | return numInBytes; |
| 309 | } |
| 310 | |
| 311 | @Override |
| 312 | public String toString() { |
| 313 | return MoreObjects.toStringHelper(getClass()) |
| 314 | .omitNullValues() |
| 315 | .toString(); |
| 316 | } |
| 317 | } |