55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
/* netcheck: check whether a given network or address overlaps with any existing routes */
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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/docker/docker/pkg/mflag"
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weavenet "github.com/weaveworks/weave/net"
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)
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func fatal(err error) {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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type stringList map[string]struct{}
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func (ss *stringList) Set(value string) error {
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(*ss)[value] = struct{}{}
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return nil
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}
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func (ss *stringList) String() string {
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return fmt.Sprintf("%v", *ss)
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}
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func main() {
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ignoreIfaceNames := make(stringList)
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mflag.Var(&ignoreIfaceNames, []string{"-ignore-iface"}, "name of interface to ignore)")
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mflag.Parse()
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if len(mflag.Args()) < 1 {
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fmt.Fprintln(os.Stderr, "usage: netcheck [--ignore-iface <iface-name>] network-cidr")
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os.Exit(1)
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}
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cidrStr := mflag.Args()[0]
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addr, ipnet, err := net.ParseCIDR(cidrStr)
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if err != nil {
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fatal(err)
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}
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if ipnet.IP.Equal(addr) {
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err = weavenet.CheckNetworkFree(ipnet, ignoreIfaceNames)
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} else {
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err = weavenet.CheckAddressOverlap(addr, ignoreIfaceNames)
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}
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if err != nil {
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fatal(err)
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}
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os.Exit(0)
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}
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