mirror of https://github.com/smcquay/cidr/
36 lines
661 B
Go
36 lines
661 B
Go
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package main
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import (
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"fmt"
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"net"
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"os"
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"github.com/apparentlymart/go-cidr/cidr"
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)
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const usage = "sn <cidr>"
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func main() {
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if len(os.Args) < 2 {
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fmt.Fprintf(os.Stderr, "usage: %v\n", usage)
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os.Exit(1)
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}
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nets := []*net.IPNet{}
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for _, sn := range os.Args[1:] {
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_, net, err := net.ParseCIDR(sn)
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v invalid: %v\n", sn, err)
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os.Exit(1)
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}
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nets = append(nets, net)
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a, b := cidr.AddressRange(net)
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l := cidr.AddressCount(net)
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fmt.Printf("%-16s %-16s %10d\n", a, b, l)
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}
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if err := cidr.NoOverlap(nets); err != nil {
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fmt.Fprintf(os.Stderr, "overlaping networks: %v\n", err)
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os.Exit(1)
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}
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}
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