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add optional refreshtime parameter to client
continuous-integration/drone/push Build is passing Details 

If refreshtime is specified, instead the client running as a one-shot command, it will instead run persistently and perform a new authentic knock sequence each specified time in minutes.
This commit is contained in:
Steven Polley 2024-04-20 17:23:52 -06:00
parent f660a5a2e5
commit 2af574fd18
1 changed files with 30 additions and 13 deletions
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43
hyp/cmd/knock.go
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@ -47,6 +47,11 @@ Example usage:
panic(fmt.Errorf("maxjitter must be value between 1 and 1500"))
}
refreshTime, err := cmd.Flags().GetInt("refreshtime")
if err != nil {
panic(fmt.Errorf("failed to parse command flag 'refreshtime': %w", err))
}
secretBytes, err := os.ReadFile(secretFilePath)
if err != nil {
log.Fatalf("failed to read file 'hyp.secret': %v", err)
@ -57,18 +62,29 @@ Example usage:
log.Fatalf("failed to base32 decode secret '%s': %v", secretFilePath, err)
}
ports, err := otphyp.GeneratePorts(decodedSecret, time.Now())
if err != nil {
log.Fatalf("failed to generate ports from shared secret: %v", err)
}
for {
// Transmit
for _, port := range ports {
fmt.Printf("knock | %s:%d\n", args[0], port)
conn, _ := net.Dial("udp", fmt.Sprintf("%s:%d", args[0], port))
conn.Write([]byte{0})
conn.Close()
time.Sleep(time.Millisecond * time.Duration(maxJitter)) // TBD: Make this configurable with flag (maxJitter)
ports, err := otphyp.GeneratePorts(decodedSecret, time.Now())
if err != nil {
log.Fatalf("failed to generate ports from shared secret: %v", err)
}
// Transmit
for _, port := range ports {
fmt.Printf("knock | %s:%d\n", args[0], port)
conn, _ := net.Dial("udp", fmt.Sprintf("%s:%d", args[0], port))
conn.Write([]byte{0})
conn.Close()
time.Sleep(time.Millisecond * time.Duration(maxJitter)) // TBD: Make this configurable with flag (maxJitter)
}
if refreshTime < 1 {
break
}
sleepDuration := time.Minute * time.Duration(refreshTime)
fmt.Printf("waiting until: %s...\n", time.Now().Add(sleepDuration).Format("15:04:05"))
time.Sleep(sleepDuration)
}
},
}
@ -76,6 +92,7 @@ Example usage:
func init() {
rootCmd.AddCommand(knockCmd)
knockCmd.PersistentFlags().String("secret", "hyp.secret", "Path to the file containing the hyp secret.")
knockCmd.PersistentFlags().Int("maxjitter", 200, "Specifies the time in milliseconds between knock sequence transmissions.")
knockCmd.PersistentFlags().String("secret", "hyp.secret", "Path to the file containing the hyp secret")
knockCmd.PersistentFlags().Int("maxjitter", 200, "Specifies the time in milliseconds between transmissions while performing the knock sequence")
knockCmd.PersistentFlags().Int("refreshtime", 0, "If specified, the hyp client will run persistently and send a full knock sequence at this interval in minutes")
}