117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
package main
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import (
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"os"
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"github.com/knadh/koanf"
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"github.com/knadh/koanf/providers/posflag"
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"github.com/sirupsen/logrus"
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flag "github.com/spf13/pflag"
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)
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var (
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// Version and date of the build. This is injected at build-time.
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buildVersion = "unknown"
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buildDate = "unknown"
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k = koanf.New(".")
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)
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func main() {
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var (
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logger = initLogger()
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)
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// Initialize hub.
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hub := NewHub(logger, buildVersion)
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// Configure Flags
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// Use the POSIX compliant pflag lib instead of Go's flag lib.
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f := flag.NewFlagSet("config", flag.ContinueOnError)
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f.Usage = renderCustomHelp
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// Path to one or more config files to load into koanf along with some config params.
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f.StringSliceP("query", "q", []string{}, "Domain name to query")
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f.StringSliceP("type", "t", []string{}, "Type of DNS record to be queried (A, AAAA, MX etc)")
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f.StringSliceP("class", "c", []string{}, "Network class of the DNS record to be queried (IN, CH, HS etc)")
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f.StringSliceP("nameserver", "n", []string{}, "Address of the nameserver to send packets to")
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// Resolver Options
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f.Int("timeout", 5, "Sets the timeout for a query to T seconds. The default timeout is 5 seconds.")
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f.Bool("search", false, "Use the search list provided in resolv.conf. It sets the `ndots` parameter as well unless overriden by `ndots` flag.")
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f.Int("ndots", 1, "Specify the ndots paramter. Default value is taken from resolv.conf and fallbacks to 1 if ndots statement is missing in resolv.conf")
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f.BoolP("ipv4", "4", false, "Use IPv4 only")
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f.BoolP("ipv6", "6", false, "Use IPv6 only")
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// Output Options
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f.BoolP("json", "J", false, "Set the output format as JSON")
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f.Bool("time", false, "Display how long it took for the response to arrive")
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f.Bool("color", true, "Show colored output")
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f.Bool("debug", false, "Enable debug mode")
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// Parse and Load Flags
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f.Parse(os.Args[1:])
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if err := k.Load(posflag.Provider(f, ".", k), nil); err != nil {
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hub.Logger.Errorf("error loading flags: %v", err)
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f.Usage()
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hub.Logger.Exit(2)
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}
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hub.FreeArgs = f.Args()
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// set log level
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if k.Bool("debug") {
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// Set logger level
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hub.Logger.SetLevel(logrus.DebugLevel)
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} else {
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hub.Logger.SetLevel(logrus.InfoLevel)
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}
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// Run the app.
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hub.Logger.Debug("Starting doggo 🐶")
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// Parse Query Args
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err := hub.loadQueryArgs()
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if err != nil {
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hub.Logger.WithError(err).Error("error parsing flags/arguments")
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hub.Logger.Exit(2)
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}
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// Load Nameservers
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for _, srv := range hub.QueryFlags.Nameservers {
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ns, err := initNameserver(srv)
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if err != nil {
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hub.Logger.WithError(err).Errorf("error parsing nameserver: %s", ns)
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hub.Logger.Exit(2)
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}
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if ns.Address != "" && ns.Type != "" {
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hub.Nameservers = append(hub.Nameservers, ns)
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}
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}
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// fallback to system nameserver
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if len(hub.Nameservers) == 0 {
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ns, err := getDefaultServers()
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if err != nil {
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hub.Logger.WithError(err).Errorf("error fetching system default nameserver")
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hub.Logger.Exit(2)
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}
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hub.Nameservers = ns
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}
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// Load Resolvers
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err = hub.initResolver()
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if err != nil {
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hub.Logger.WithError(err).Error("error loading resolver")
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hub.Logger.Exit(2)
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}
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// Start App
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if len(hub.QueryFlags.QNames) == 0 {
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f.Usage()
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hub.Logger.Exit(0)
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}
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err = hub.Lookup()
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if err != nil {
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hub.Logger.WithError(err).Error("error looking up DNS records")
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hub.Logger.Exit(2)
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}
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}
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