IPv6验证

Question

我使用IPAddressUtil.isIPv6LiteralAddress (ipAddress)方法来验证IPv6，但是对于IPV6的IPV6 6地址/前缀长度格式(格式在RFC 4291第2.3节中提到)，这种方法失败了。

有谁知道任何验证“ipv6 6地址/前缀长度”格式的验证器吗？

IPV6的法律表述

1. ABCD:EF01 01:2345:6789:ABCD:EF01 01:2345:6789
2. 2001年:Db8:0:0:8:800:200 C:417 A
3. FF01 01:0:0:0:0:0:0:101
4. 0:0:0:0:0:0：
5. 0:0:0:0:0:0:0
6. 2001年:Db8：：8:800:200 C:417 A
7. FF01 01:101
8. ::1
9. :：
10. 0:0:0:0:0:0:13.1.68.3
11. 0:0:0:0:0:FFFF:129.144.52.38
12. *13.1.68.3
13. F:129.144.52.38
14. 2001:0DB8:0000:60 30:0000:0000:0000:0000/60
15. 2001年:0DB8：：60 30:0:0:0:0/60
16. 2001年:0DB8:0:60 30：：/60

非IPV6的法律表述

1. 2001:0DB8:0:CD3/60
2. 2001年:0DB8：：CD30 30/60
3. 2001:0DB8::CD3/60

Answer 1

看看这是否有效：

try {
    if (subjectString.matches(
        "(?ix)\\A(?:                                                  # Anchor address\n" +
        " (?:  # Mixed\n" +
        "  (?:[A-F0-9]{1,4}:){6}                                # Non-compressed\n" +
        " |(?=(?:[A-F0-9]{0,4}:){2,6}                           # Compressed with 2 to 6 colons\n" +
        "     (?:[0-9]{1,3}\\.){3}[0-9]{1,3}                     #    and 4 bytes\n" +
        "     \\z)                                               #    and anchored\n" +
        "  (([0-9A-F]{1,4}:){1,5}|:)((:[0-9A-F]{1,4}){1,5}:|:)  #    and at most 1 double colon\n" +
        " |::(?:[A-F0-9]{1,4}:){5}                              # Compressed with 7 colons and 5 numbers\n" +
        " )\n" +
        " (?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.){3}  # 255.255.255.\n" +
        " (?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])           # 255\n" +
        "|     # Standard\n" +
        " (?:[A-F0-9]{1,4}:){7}[A-F0-9]{1,4}                    # Standard\n" +
        "|     # Compressed\n" +
        " (?=(?:[A-F0-9]{0,4}:){0,7}[A-F0-9]{0,4}               # Compressed with at most 7 colons\n" +
        "    \\z)                                                #    and anchored\n" +
        " (([0-9A-F]{1,4}:){1,7}|:)((:[0-9A-F]{1,4}){1,7}|:)    #    and at most 1 double colon\n" +
        "|(?:[A-F0-9]{1,4}:){7}:|:(:[A-F0-9]{1,4}){7}           # Compressed with 8 colons\n" +
        ")/[A-F0-9]{0,4}\\z                                                    # Anchor address")) 
        {
        // String matched entirely
    } else {
        // Match attempt failed
    } 
} catch (PatternSyntaxException ex) {
    // Syntax error in the regular expression
}

大约一年前，我为一些复杂的正则表达式购买了一个名为RegexMagic的非常有用的程序。

这应该是Java，所以它应该编译，我假设/60可以在0000和FFFF之间，您可以修改最后一部分。

/A-F0-9{0,4}是我添加到正则表达式中以匹配示例的内容。

Answer 2

您可以使用Guava库，特别是使用com.google.common.net.InetAddresses类，调用isInetAddress()。

isInetAddress

public static boolean isInetAddress(String ipString)

如果提供的字符串是有效的IP字符串文本，则返回true，否则返回false。

参数：作为IP字符串文本计算的ipString - String

如果参数是有效的IP字符串文本，返回：true

Answer 3

IPAddress Java库支持以多态方式解析IPv4和IPv6 CIDR子网(即地址/前缀格式)。免责声明:我是项目经理。

下面的方法是验证的示例代码：

static void parse(String str) {
    IPAddressString addrString = new IPAddressString(str);
    try {
         IPAddress addr = addrString.toAddress();
         IPAddress hostAddr = addrString.toHostAddress();
         Integer prefix = addr.getNetworkPrefixLength();
         if(prefix == null) {
             System.out.println(addr + " has no prefix length"); 
         } else {
             System.out.println(addr + " has host address " + hostAddr + " and prefix length " + prefix);
         }
    } catch(AddressStringException e) {
        System.out.println(addrString + " is invalid: " + e.getMessage());
    }
}

使用问题中提供的例子，上述方法的输出如下：

abcd:ef01:2345:6789:abcd:ef01:2345:6789 has no prefix length
2001:db8::8:800:200c:417a has no prefix length
ff01::101 has no prefix length
::1 has no prefix length
:: has no prefix length
2001:db8::8:800:200c:417a has no prefix length
ff01::101 has no prefix length
::1 has no prefix length
:: has no prefix length
::d01:4403 has no prefix length
::ffff:8190:3426 has no prefix length
::d01:4403 has no prefix length
FFFF:129.144.52.38 is invalid: FFFF:129.144.52.38 IP Address error: address has too few segments
2001:db8:0:cd30::/60 has host address 2001:db8:0:cd30:: and prefix length 60
2001:db8:0:cd30::/60 has host address 2001:db8:0:cd30:: and prefix length 60
2001:db8:0:cd30::/60 has host address 2001:db8:0:cd30:: and prefix length 60
2001:0DB8:0:CD3/60 is invalid: 2001:0DB8:0:CD3/60 IP Address error: address has too few segments
2001:db8::cd30/60 has host address 2001:db8::cd30 and prefix length 60
2001:db8::cd3/60 has host address 2001:db8::cd3 and prefix length 60

如你所见，关于FFFF:129.144.52.38是有效的，大约2001年:Db8：：cd3 30/60和2001:Db8:Db8:CD3/60无效，这个问题是不正确的。第一个条件是::FFFF:129.144.52.38