Steven Polley
e85b644e82
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This to allow configurable time between knock sequence transmissions. It's important the sequence arrive in the correct order, and some networks have multiple paths.
77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
/*
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Copyright © 2024 Steven Polley <himself@stevenpolley.net>
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*/
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package cmd
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import (
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"fmt"
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"log"
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"net"
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"os"
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"time"
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"deadbeef.codes/steven/hyp/otphyp"
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"github.com/spf13/cobra"
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)
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// knockCmd represents the knock command
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var knockCmd = &cobra.Command{
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Use: "knock <hypServer>",
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Short: "Sends an authenticated knock sequence to the server specified",
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Long: `Runs the hyp client and performs an authentic knock sequence
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against the server provided.
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Example usage:
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hyp knock <hypServer>
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hyp knock hyp.deadbeef.codes
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hyp knock 10.69.4.20
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`,
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Args: cobra.ExactArgs(1),
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Run: func(cmd *cobra.Command, args []string) {
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// load secret and generate ports using secret and current time
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secretFilePath, err := cmd.Flags().GetString("secret")
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if err != nil {
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panic(fmt.Errorf("failed to parse command flag 'secret': %w", err))
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}
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maxJitter, err := cmd.Flags().GetInt("maxjitter")
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if err != nil {
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panic(fmt.Errorf("failed to parse command flag 'maxjitter': %w", err))
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}
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if maxJitter < 1 || maxJitter > 1500 {
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panic(fmt.Errorf("maxjitter must be value between 1 and 1500"))
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}
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secretBytes, err := os.ReadFile(secretFilePath)
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if err != nil {
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log.Fatalf("failed to read file 'hyp.secret': %v", err)
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}
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sharedSecret := string(secretBytes)
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ports, err := otphyp.GeneratePorts(sharedSecret, time.Now())
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if err != nil {
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log.Fatalf("failed to generate ports from shared secret: %v", err)
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}
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// Transmit
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for _, port := range ports {
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fmt.Printf("knock | %s:%d\n", args[0], port)
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conn, _ := net.Dial("udp", fmt.Sprintf("%s:%d", args[0], port))
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conn.Write([]byte{0})
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conn.Close()
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time.Sleep(time.Millisecond * time.Duration(maxJitter)) // TBD: Make this configurable with flag (maxJitter)
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}
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},
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}
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func init() {
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rootCmd.AddCommand(knockCmd)
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knockCmd.PersistentFlags().String("secret", "hyp.secret", "Path to the file containing the hyp secret.")
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knockCmd.PersistentFlags().Int("maxjitter", 200, "Specifies the time in milliseconds between knock sequence transmissions.")
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}
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