initial release

.gitignore

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+rakefile

cmd/root.go

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+package cmd
+
+import (
+	"fmt"
+	"log"
+	"net"
+
+	"github.com/spf13/cobra"
+)
+
+var RootCmd = &cobra.Command{
+	Use:   "porttester",
+	Short: "test if the tcp port is open",
+	Long:  "A cross platform TCP port availability tester. Useful for firewall testing both host and external.",
+	Run:   port_tester,
+}
+
+var host string
+var port int
+
+func init() {
+	RootCmd.PersistentFlags().StringVarP(&host, "hostname", "o", "", "hostname or ip to connect to")
+	RootCmd.PersistentFlags().IntVarP(&port, "port", "p", -1, "TCP port to test")
+}
+
+func port_tester(cmd *cobra.Command, args []string) {
+	addr := fmt.Sprintf("%s:%d", host, port)
+	conn, err := net.Dial("tcp", addr)
+
+	if err != nil {
+		log.Fatalf("Connection Failed: %v", err)
+	} else {
+		conn.Close()
+	}
+
+	log.Printf("Port %d is opened", port)
+}

porttester.go

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+package main
+
+import (
+	"log"
+	"os"
+
+	"./cmd"
+)
+
+func main() {
+	err := cmd.RootCmd.Execute()
+	if err != nil {
+		log.Printf("error to execute:%v", err)
+		os.Exit(1)
+	}
+}

readme.md

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+# A simple port tester
+A cross platform TCP port availability tester. Useful for firewall testing both host and external.
+
+## Usage
+```
+./porttester -o host -p 8080
+```