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33 lines
624 B
33 lines
624 B
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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)
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const usage = "cidr <cidr>[, cidr2,...,cidrN]"
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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 := AddressRange(net)
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l := 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 := 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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