public static boolean matchIpRange()

in dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java [743:807]
57 lines of code
22 McCabe index (conditional complexity)

    public static boolean matchIpRange(String pattern, String host, int port) throws UnknownHostException {
        if (pattern == null || host == null) {
            throw new IllegalArgumentException(
                    "Illegal Argument pattern or hostName. Pattern:" + pattern + ", Host:" + host);
        }
        pattern = pattern.trim();
        if ("*.*.*.*".equals(pattern) || "*".equals(pattern)) {
            return true;
        }

        InetAddress inetAddress = InetAddress.getByName(host);
        boolean isIpv4 = isValidV4Address(inetAddress);
        String[] hostAndPort = getPatternHostAndPort(pattern, isIpv4);
        if (hostAndPort[1] != null && !hostAndPort[1].equals(String.valueOf(port))) {
            return false;
        }
        pattern = hostAndPort[0];

        String splitCharacter = SPLIT_IPV4_CHARACTER;
        if (!isIpv4) {
            splitCharacter = SPLIT_IPV6_CHARACTER;
        }
        String[] mask = pattern.split(splitCharacter);
        // check format of pattern
        checkHostPattern(pattern, mask, isIpv4);

        host = inetAddress.getHostAddress();
        if (pattern.equals(host)) {
            return true;
        }

        // short name condition
        if (!ipPatternContainExpression(pattern)) {
            InetAddress patternAddress = InetAddress.getByName(pattern);
            return patternAddress.getHostAddress().equals(host);
        }

        String[] ipAddress = host.split(splitCharacter);

        for (int i = 0; i < mask.length; i++) {
            if ("*".equals(mask[i]) || mask[i].equals(ipAddress[i])) {
                continue;
            } else if (mask[i].contains("-")) {
                String[] rangeNumStrs = StringUtils.split(mask[i], '-');
                if (rangeNumStrs.length != 2) {
                    throw new IllegalArgumentException("There is wrong format of ip Address: " + mask[i]);
                }
                Integer min = getNumOfIpSegment(rangeNumStrs[0], isIpv4);
                Integer max = getNumOfIpSegment(rangeNumStrs[1], isIpv4);
                Integer ip = getNumOfIpSegment(ipAddress[i], isIpv4);
                if (ip < min || ip > max) {
                    return false;
                }
            } else if ("0".equals(ipAddress[i])
                    && ("0".equals(mask[i])
                            || "00".equals(mask[i])
                            || "000".equals(mask[i])
                            || "0000".equals(mask[i]))) {
                continue;
            } else if (!mask[i].equals(ipAddress[i])) {
                return false;
            }
        }
        return true;
    }