是否有任何功能可以在雪花中不使用 Parse_IP 将 CIDR 块拆分为 IP 开始和 IP 结束

Question

例如对于 cidr 2c0f:eb00:400::/40 (jw.org) ip_start 应该是 - 2c0f:eb00:400:: ip_end 将是 - 2c0f:eb00:4ff:ffff:ffff:ffff:ffff:ffff

Answer 1

我提交了一个内部错误来修复此边缘情况 (SNOW-374145) 的 PARSE_IP() 内部函数。

同时，您可以使用 Java UDF，例如：

select ipv6range('FF02:0:0:0:0:1:FF00::/104');

Returns:

[
  "/ff02:0:0:0:0:1:ff00:0",
  "/ff02:0:0:0:0:1:ffff:ffff"
]

代码取自https://github.com/edazdarevic/CIDRUtils：

create or replace function ipv6range(s string) 
returns array 
language java 
handler='MyClass.x'
as $$
/*
* The MIT License
*
* Copyright (c) 2013 Edin Dazdarevic (edin.dazdarevic@gmail.com)
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* */


import java.math.BigInteger;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;

public class MyClass{
public static String[] x(String x) throws Exception{
    CIDRUtils cidr = new CIDRUtils(x);
    return new String[]{cidr.startAddress.toString(), cidr.endAddress.toString()};
}
}

/**
 * A class that enables to get an IP range from CIDR specification. It supports
 * both IPv4 and IPv6.
 */
public class CIDRUtils {
    private final String cidr;

    private InetAddress inetAddress;
    InetAddress startAddress;
    InetAddress endAddress;
    private final int prefixLength;


    public CIDRUtils(String cidr) throws UnknownHostException {

        this.cidr = cidr;

        /* split CIDR to address and prefix part */
        if (this.cidr.contains("/")) {
            int index = this.cidr.indexOf("/");
            String addressPart = this.cidr.substring(0, index);
            String networkPart = this.cidr.substring(index + 1);

            inetAddress = InetAddress.getByName(addressPart);
            prefixLength = Integer.parseInt(networkPart);

            calculate();
        } else {
            throw new IllegalArgumentException("not an valid CIDR format!");
        }
    }


    private void calculate() throws UnknownHostException {

        ByteBuffer maskBuffer;
        int targetSize;
        if (inetAddress.getAddress().length == 4) {
            maskBuffer =
                    ByteBuffer
                            .allocate(4)
                            .putInt(-1);
            targetSize = 4;
        } else {
            maskBuffer = ByteBuffer.allocate(16)
                    .putLong(-1L)
                    .putLong(-1L);
            targetSize = 16;
        }

        BigInteger mask = (new BigInteger(1, maskBuffer.array())).not().shiftRight(prefixLength);

        ByteBuffer buffer = ByteBuffer.wrap(inetAddress.getAddress());
        BigInteger ipVal = new BigInteger(1, buffer.array());

        BigInteger startIp = ipVal.and(mask);
        BigInteger endIp = startIp.add(mask.not());

        byte[] startIpArr = toBytes(startIp.toByteArray(), targetSize);
        byte[] endIpArr = toBytes(endIp.toByteArray(), targetSize);

        this.startAddress = InetAddress.getByAddress(startIpArr);
        this.endAddress = InetAddress.getByAddress(endIpArr);

    }

    private byte[] toBytes(byte[] array, int targetSize) {
        int counter = 0;
        List<Byte> newArr = new ArrayList<Byte>();
        while (counter < targetSize && (array.length - 1 - counter >= 0)) {
            newArr.add(0, array[array.length - 1 - counter]);
            counter++;
        }

        int size = newArr.size();
        for (int i = 0; i < (targetSize - size); i++) {

            newArr.add(0, (byte) 0);
        }

        byte[] ret = new byte[newArr.size()];
        for (int i = 0; i < newArr.size(); i++) {
            ret[i] = newArr.get(i);
        }
        return ret;
    }

    public String getNetworkAddress() {

        return this.startAddress.getHostAddress();
    }

    public String getBroadcastAddress() {
        return this.endAddress.getHostAddress();
    }

    public boolean isInRange(String ipAddress) throws UnknownHostException {
        InetAddress address = InetAddress.getByName(ipAddress);
        BigInteger start = new BigInteger(1, this.startAddress.getAddress());
        BigInteger end = new BigInteger(1, this.endAddress.getAddress());
        BigInteger target = new BigInteger(1, address.getAddress());

        int st = start.compareTo(target);
        int te = target.compareTo(end);

        return (st == -1 || st == 0) && (te == -1 || te == 0);
    }
}
$$
;

顺便说一句，PARSE_IP() 显示的错误（直到修复）是“解析 IP 时出错：无效的 IPv6 地址。IP 地址包含太多字段。”

是否有任何功能可以在雪花中不使用 Parse_IP 将 CIDR 块拆分为 IP 开始和 IP 结束

Is there any function to split CIDR block into IP start and IP end without using Parse_IP in snowflake

java

ip

user-defined-functions

snowflake-cloud-data-platform