commit 19e607fa6904e3ce0fc0be36f8508311c0c380b7
Author: TaurusXin <i@taurusxin.com>
Date:   Mon Apr 22 13:57:55 2024 +0800

    init: repository

diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.exe
+
+tcping
\ No newline at end of file
diff --git a/Makefile b/Makefile
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index 0000000..e69de29
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
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+# Tcping GO
+
+一个使用go写的小工具，用于检测TCP端口是否开放。
+
+## 使用方法
+
+```shell
+tcping -h
+
+Usage of tcping:
+  -c, --count int          测试次数，默认为4次 (default 4)
+  -h, --help               显示帮助信息
+  -t, --infinite           无限次测试
+  -6, --ipv6               使用 IPv6，需搭配域名使用
+  -p, --port int           端口，默认为80 (default 80)
+  -s, --timeout duration   超时时间，默认为2秒 (default 2s)
+```
diff --git a/go.mod b/go.mod
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index 0000000..eb4e2f9
--- /dev/null
+++ b/go.mod
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+module tcping
+
+go 1.22.1
+
+require github.com/spf13/pflag v1.0.5
diff --git a/go.sum b/go.sum
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index 0000000..287f6fa
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
diff --git a/main.go b/main.go
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--- /dev/null
+++ b/main.go
@@ -0,0 +1,142 @@
+package main
+
+import (
+	flag "github.com/spf13/pflag"
+	"fmt"
+	"net"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+func main() {
+	var (
+		port            int
+		count           int
+		timeoutDuration time.Duration
+		infinite        bool
+		ipv6						bool
+
+		successCount int
+		attemptCount int
+		stopped      bool
+	)
+
+	// 设置命令行参数
+	help := flag.BoolP("help", "h", false, "显示帮助信息")
+	flag.IntVarP(&port, "port", "p", 80, "端口，默认为80")
+	flag.IntVarP(&count, "count", "c", 4, "测试次数，默认为4次")
+	flag.DurationVarP(&timeoutDuration, "timeout", "s", 2*time.Second, "超时时间，默认为2秒")
+	flag.BoolVarP(&infinite, "infinite", "t", false, "无限次测试")
+	flag.BoolVarP(&ipv6, "ipv6", "6", false, "使用 IPv6，需搭配域名使用")
+	
+	flag.Parse()
+
+	if *help {
+		flag.Usage()
+		os.Exit(0)
+	}
+
+	args := flag.Args()
+	if len(args) < 1 {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	if port < 1 || port > 65535 {
+		fmt.Println("端口号必须在1-65535之间")
+		os.Exit(1)
+	}
+
+	hostname := args[0]
+
+	// 设置信号捕获
+	stopped = false
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+
+	ip := ""
+
+	if net.ParseIP(hostname) == nil {
+		// 解析域名
+		ips, err := net.LookupIP(hostname)
+		if err != nil {
+			fmt.Printf("解析 %s 失败: %s\n", hostname, err)
+			os.Exit(1)
+		}
+		record := "A"
+		if ipv6 {
+			record = "AAAA"
+		}
+		ip, err = filterIP(ips, ipv6)
+		if (err != nil) {
+			fmt.Printf("找不到 %s 的 %s 记录\n", hostname, record)
+			os.Exit(1)
+		}
+		fmt.Printf("使用 %s 的 %s 记录: %s\n", hostname, record, ip)
+	} else {
+		ip = hostname
+	}
+
+	address := net.JoinHostPort(ip, fmt.Sprintf("%d", port))
+
+	if infinite {
+		count = -1
+	}
+
+	done := make(chan bool, 1)
+	go func() {
+		for i := 0; infinite || i < count; i++ {
+			start := time.Now()
+			conn, err := net.DialTimeout("tcp", address, timeoutDuration)
+			duration := time.Since(start)
+			attemptCount++
+
+			if err != nil {
+				fmt.Printf("测试到 %s 的连接失败: %s\n", address, "连接超时")
+			} else {
+				successCount++
+				fmt.Printf("[%d] 来自 %s 的响应: 时间=%s\n",i+1, address, fmt.Sprintf("%.3fms", float64(duration)/float64(time.Millisecond)))
+				conn.Close()
+			}
+
+			if !infinite && attemptCount >= count {
+				break
+			}
+			time.Sleep(1 * time.Second)
+		}
+		done <- true
+	}()
+
+	// 等待信号或测试完成
+	select {
+	case <-sigChan:
+		fmt.Println("\n测试被用户中断")
+		stopped = true
+	case <-done:
+	}
+
+	// 打印统计结果
+	if !stopped {
+		fmt.Println()
+	}
+	fmt.Printf("测试完成，成功次数: %d/%d\n", successCount, attemptCount)
+}
+
+func filterIP(ips []net.IP, ipv6 bool) (string, error) {
+	if ipv6 {
+		for _, ip := range ips {
+			if ip.To16() != nil && ip.To4() == nil {
+				return ip.String(), nil
+			}
+		}
+	} else {
+		for _, ip := range ips {
+			if ip.To4() != nil && ip.To16() != nil {
+				return ip.String(), nil
+			}
+		}
+	}
+	return "", fmt.Errorf("找不到合适的IP地址")
+}