| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.wifi; |
| |
| import android.text.TextUtils; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| /** |
| * Class for storing an IMSI (International Mobile Subscriber Identity) parameter. The IMSI |
| * contains number (up to 15) of numerical digits. When an IMSI ends with a '*', the specified |
| * IMSI is a prefix. |
| */ |
| public class IMSIParameter { |
| /** |
| * Per 2.2 of 3GPP TS 23.003 |
| * MCC (Mobile Country Code) is a 3 digit number and MNC (Mobile Network Code) is a 2 |
| * or 3 digit number; |
| * The max length of IMSI is 15; |
| */ |
| public static final int MCC_MNC_LENGTH_5 = 5; |
| public static final int MCC_MNC_LENGTH_6 = 6; |
| private static final int MAX_IMSI_LENGTH = 15; |
| |
| private final String mImsi; |
| private final boolean mPrefix; |
| |
| @VisibleForTesting |
| public IMSIParameter(String imsi, boolean prefix) { |
| mImsi = imsi; |
| mPrefix = prefix; |
| } |
| |
| /** |
| * Build an IMSIParameter object from the given string. A null will be returned for a |
| * malformed string. |
| * |
| * @param imsi The IMSI string |
| * @return {@link IMSIParameter} |
| */ |
| public static IMSIParameter build(String imsi) { |
| if (TextUtils.isEmpty(imsi)) { |
| return null; |
| } |
| if (imsi.length() > MAX_IMSI_LENGTH) { |
| return null; |
| } |
| |
| // Detect the first non-digit character. |
| int nonDigitIndex; |
| char stopChar = '\0'; |
| for (nonDigitIndex = 0; nonDigitIndex < imsi.length(); nonDigitIndex++) { |
| stopChar = imsi.charAt(nonDigitIndex); |
| if (stopChar < '0' || stopChar > '9') { |
| break; |
| } |
| } |
| |
| if (nonDigitIndex == imsi.length()) { |
| // Full IMSI. |
| return new IMSIParameter(imsi, false); |
| } else if (nonDigitIndex == imsi.length() - 1 && stopChar == '*' |
| && (nonDigitIndex == MCC_MNC_LENGTH_5 || nonDigitIndex == MCC_MNC_LENGTH_6)) { |
| // IMSI prefix. |
| return new IMSIParameter(imsi.substring(0, nonDigitIndex), true); |
| } |
| return null; |
| } |
| |
| /** |
| * Perform matching against the given full IMSI. |
| * |
| * @param fullIMSI The full IMSI to match against |
| * @return true if matched |
| */ |
| public boolean matchesImsi(String fullIMSI) { |
| if (fullIMSI == null) { |
| return false; |
| } |
| |
| if (mPrefix) { |
| // Prefix matching. |
| return mImsi.regionMatches(false, 0, fullIMSI, 0, mImsi.length()); |
| } else { |
| // Exact matching. |
| return mImsi.equals(fullIMSI); |
| } |
| } |
| |
| /** |
| * Perform matching against the given MCC-MNC (Mobile Country Code and Mobile Network |
| * Code) combination. |
| * |
| * @param mccMnc The MCC-MNC to match against |
| * @return true if matched |
| */ |
| public boolean matchesMccMnc(String mccMnc) { |
| if (mccMnc == null) { |
| return false; |
| } |
| if (mccMnc.length() != MCC_MNC_LENGTH_5 && mccMnc.length() != MCC_MNC_LENGTH_6) { |
| return false; |
| } |
| if (mPrefix && mccMnc.length() != mImsi.length()) { |
| return false; |
| } |
| |
| return mImsi.startsWith(mccMnc); |
| } |
| |
| /** |
| * If the IMSI is full length. |
| * |
| * @return true If the length of IMSI is full, false otherwise. |
| */ |
| public boolean isFullImsi() { |
| return !mPrefix; |
| } |
| |
| @Override |
| public boolean equals(Object thatObject) { |
| if (this == thatObject) { |
| return true; |
| } |
| if (!(thatObject instanceof IMSIParameter)) { |
| return false; |
| } |
| |
| IMSIParameter that = (IMSIParameter) thatObject; |
| return mPrefix == that.mPrefix && TextUtils.equals(mImsi, that.mImsi); |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = mImsi != null ? mImsi.hashCode() : 0; |
| result = 31 * result + (mPrefix ? 1 : 0); |
| return result; |
| } |
| |
| @Override |
| public String toString() { |
| if (mPrefix) { |
| return mImsi + '*'; |
| } |
| else { |
| return mImsi; |
| } |
| } |
| } |