works

.gitignore

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+temp
+*.json

README.md

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+# goNmapTelegramBot
+
+This is a simple telegram bot, that gets an ip, performs a nmap port scan, and returns the result to the telegram user.
+
+Warning: is not recommended to leave the Bot running, a possible attack to the Bot (and the server where is the Bot running) could be insect command lines outside the nmap
+
+
+![goNmapTelegramBot](https://raw.githubusercontent.com/arnaucode/goNmapTelegramBot/master/screenrecording1.gif "goNmapTelegramBot")

main.go

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+package main
+
+import (
+	"strings"
+)
+
+func checkIp(text string) bool {
+	if len(strings.Split(text, ".")) != 4 {
+		return false
+	}
+	if len(strings.Split(text, "")) > 16 {
+		return false
+	}
+
+	return true
+}
+
+func main() {
+	readConfig()
+	telegramBot()
+}

nmap.go

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+package main
+
+import (
+	"fmt"
+	"os/exec"
+)
+
+func nmap(ip string) string {
+	out, err := exec.Command("nmap", "-T4", "F", ip).Output()
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	fmt.Println(string(out))
+	return string(out)
+}

readConfig.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+)
+
+//Config stores the data from json twitterConfig.json file
+type Config struct {
+	TelegramBotToken string `json:"telegramBotToken"`
+}
+
+var config Config
+
+func readConfig() {
+	file, e := ioutil.ReadFile("config.json")
+	if e != nil {
+		fmt.Println("error:", e)
+	}
+	content := string(file)
+	json.Unmarshal([]byte(content), &config)
+	fmt.Println("config.json read comlete, Telegram bot ready")
+
+}

telegramBot.go

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+package main
+
+import (
+	"fmt"
+	"log"
+
+	"gopkg.in/telegram-bot-api.v4"
+)
+
+func telegramBot() {
+	bot, err := tgbotapi.NewBotAPI(config.TelegramBotToken)
+	if err != nil {
+		log.Panic(err)
+	}
+
+	//bot.Debug = true
+	//log.Printf("Authorized on account %s", bot.Self.UserName)
+
+	u := tgbotapi.NewUpdate(0)
+	u.Timeout = 60
+
+	updates, err := bot.GetUpdatesChan(u)
+
+	for update := range updates {
+		if update.Message == nil {
+			continue
+		}
+
+		//log.Printf("[%s] %s", update.Message.From.UserName, update.Message.Text)
+		fmt.Println("new ip to scan: " + update.Message.Text)
+		var result string
+		ok := checkIp(update.Message.Text)
+		if update.Message.Text == "/start" {
+			result = "welcome to nmap telegram bot, written in Go lang"
+		} else {
+
+			if ok {
+				result = nmap(update.Message.Text)
+			} else {
+				result = "ip not valid"
+			}
+		}
+
+		msg := tgbotapi.NewMessage(update.Message.Chat.ID, result)
+		msg.ReplyToMessageID = update.Message.MessageID
+
+		bot.Send(msg)
+	}
+}