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Add maxjitter flag to hyp client
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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.
This commit is contained in:
Steven Polley 2024-04-16 19:44:25 -06:00
parent 2c43affac9
commit e85b644e82
1 changed files with 11 additions and 2 deletions
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13
hyp/cmd/knock.go
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@ -38,6 +38,14 @@ Example usage:
panic(fmt.Errorf("failed to parse command flag 'secret': %w", err)) panic(fmt.Errorf("failed to parse command flag 'secret': %w", err))
} }
maxJitter, err := cmd.Flags().GetInt("maxjitter")
if err != nil {
panic(fmt.Errorf("failed to parse command flag 'maxjitter': %w", err))
}
if maxJitter < 1 || maxJitter > 1500 {
panic(fmt.Errorf("maxjitter must be value between 1 and 1500"))
}
secretBytes, err := os.ReadFile(secretFilePath) secretBytes, err := os.ReadFile(secretFilePath)
if err != nil { if err != nil {
log.Fatalf("failed to read file 'hyp.secret': %v", err) log.Fatalf("failed to read file 'hyp.secret': %v", err)
@ -50,12 +58,12 @@ Example usage:
} }
// Transmit // Transmit
fmt.Println("Transmitting knock sequence:", ports)
for _, port := range ports { 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, _ := net.Dial("udp", fmt.Sprintf("%s:%d", args[0], port))
conn.Write([]byte{0}) conn.Write([]byte{0})
conn.Close() conn.Close()
time.Sleep(time.Millisecond * 200) // TBD: Make this configurable with flag (maxJitter) time.Sleep(time.Millisecond * time.Duration(maxJitter)) // TBD: Make this configurable with flag (maxJitter)
} }
}, },
} }
@ -64,4 +72,5 @@ func init() {
rootCmd.AddCommand(knockCmd) rootCmd.AddCommand(knockCmd)
knockCmd.PersistentFlags().String("secret", "hyp.secret", "Path to the file containing the hyp secret.") 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.")
} }