84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
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package main
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import (
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"encoding/json"
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"fmt"
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"math"
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"net"
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"os"
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)
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type Azure struct {
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ChangeNumber int `json:"changeNumber"`
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Cloud string `json:"cloud"`
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Values []struct {
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Name string `json:"name"`
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ID string `json:"id"`
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Properties struct {
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ChangeNumber int `json:"changeNumber"`
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Region string `json:"region"`
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RegionID int `json:"regionId"`
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Platform string `json:"platform"`
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SystemService string `json:"systemService"`
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AddressPrefixes []string `json:"addressPrefixes"`
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NetworkFeatures []string `json:"networkFeatures"`
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} `json:"properties"`
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} `json:"values"`
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}
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func main() {
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// https://www.microsoft.com/en-us/download/details.aspx?id=56519
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f, err := os.Open("./ServiceTags_Public_20230724.json")
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if err != nil {
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panic(err)
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}
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defer f.Close()
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input := Azure{}
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err = json.NewDecoder(f).Decode(&input)
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if err != nil {
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panic(err)
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}
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totalIpv4 := 0
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totalIpv6 := 0
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smallestIpv4Prefix := 32
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smallestIpv6Prefix := 128
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for _, v := range input.Values {
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for _, addr := range v.Properties.AddressPrefixes {
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_, cidr, err := net.ParseCIDR(addr)
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if err != nil {
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panic(err)
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}
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ones, bits := cidr.Mask.Size()
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if bits == 128 {
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// Only track /64 blocks
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bits = 64
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totalIpv6 += int(math.Pow(2.0, float64(bits-ones)))
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if ones < smallestIpv6Prefix {
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smallestIpv6Prefix = ones
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}
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} else if bits == 32 {
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totalIpv4 += int(math.Pow(2.0, float64(bits-ones)))
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if ones < smallestIpv4Prefix {
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smallestIpv4Prefix = ones
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}
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} else {
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panic("unknown bits??")
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}
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}
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}
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fmt.Println("Total Ipv4 Address Count", totalIpv4, "Smallest Ipv4 Prefix", smallestIpv4Prefix)
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fmt.Println("Total Ipv6 Address Count", totalIpv6, "Smallest Ipv6 Prefix", smallestIpv6Prefix)
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}
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