100 lines
2.9 KiB
Go
100 lines
2.9 KiB
Go
/*
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Copyright © 2020 NAME HERE <EMAIL ADDRESS>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cmd
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import (
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"fmt"
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"os"
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"github.com/davecgh/go-spew/spew"
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"github.com/google/gopacket"
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"github.com/google/gopacket/pcap"
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homedir "github.com/mitchellh/go-homedir"
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"github.com/spf13/cobra"
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"github.com/spf13/viper"
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)
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var cfgFile string
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// rootCmd represents the base command when called without any subcommands
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var rootCmd = &cobra.Command{
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Use: "sniff-dns",
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Short: "basic local DNS sniffer",
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// Uncomment the following line if your bare application
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// has an action associated with it:
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Run: func(cmd *cobra.Command, args []string) {
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if handle, err := pcap.OpenLive("enx4ce1734b8f22", 1600, true, pcap.BlockForever); err != nil {
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panic(err)
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} else if err := handle.SetBPFFilter("udp and port 53"); err != nil { // optional
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panic(err)
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} else {
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packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
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for packet := range packetSource.Packets() {
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spew.Dump(packet)
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}
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}
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},
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}
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// Execute adds all child commands to the root command and sets flags appropriately.
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// This is called by main.main(). It only needs to happen once to the rootCmd.
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func Execute() {
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if err := rootCmd.Execute(); err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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}
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func init() {
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cobra.OnInitialize(initConfig)
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// Here you will define your flags and configuration settings.
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// Cobra supports persistent flags, which, if defined here,
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// will be global for your application.
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rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.sniff-dns.yaml)")
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// Cobra also supports local flags, which will only run
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// when this action is called directly.
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rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
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}
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// initConfig reads in config file and ENV variables if set.
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func initConfig() {
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if cfgFile != "" {
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// Use config file from the flag.
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viper.SetConfigFile(cfgFile)
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} else {
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// Find home directory.
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home, err := homedir.Dir()
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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// Search config in home directory with name ".sniff-dns" (without extension).
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viper.AddConfigPath(home)
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viper.SetConfigName(".sniff-dns")
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}
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viper.AutomaticEnv() // read in environment variables that match
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// If a config file is found, read it in.
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if err := viper.ReadInConfig(); err == nil {
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fmt.Println("Using config file:", viper.ConfigFileUsed())
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}
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}
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