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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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