json - How to validate the subnet mask with ajv

Question

I am trying to validate an ipv4 address with the prefix for the subnet mask (CIDR notation).
Is there a way to do this with ajv or with the ajv-format package?

my first attempts (in ts) look like this:

type typeIpv4 = {
    ipv4: string
}

const schemaIpv4: JSONSchemaType<typeIpv4> = {
    type: "object",
    properties: {
        ipv4: {
            type: "string",
            format: "ipv4"
        }
    },
    required: ["ipv4"]
}

example, incoming json:

{
    ipv4: "192.168.100.14/24",
}

a not very nice solution is to cut out the IP address, validate it with ajv and test the mask by hand (programmatically) itself:

const ip: typeIpv4 = { ipv4: ipv4.split("/")[0] }
const validateIp = ajv.compile(schemaIpv4);

For example joi offers the cidr notation as validation option:

const schema = joi.string().ip({
    version: [
        'ipv4',
        'ipv6'
    ],
    cidr: 'optional'
});

I have read the documentary of ajv but i might have misunderstood something.

UPDATE:
work-around: I split the string and parse the mask to an Int/number

const splitIpv4 = ipv4.split("/")
    const ip: typeIpv4 = {
        ipv4: splitIpv4[0],
        cidr: parseInt(splitIpv4[1])
    }

I have added the additional property cidr to the schema. Now the validation goes over the range of valid subnet masks (0-32 corresponds to 0.0.0.0 - 255.255.255.255)

...
cidr: {
            type: "number",
            minimum: 0,
            maximum: 32
        }
...

The problem here is that it is not looked whether the specified IP address is a network or broadcast address in the subnet.

question from:https://stackoverflow.com/questions/66050374/how-to-validate-the-subnet-mask-with-ajv

Answer 1

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