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@@ -0,0 +1,67 @@
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+//端口扫描，扫描哪些端口在使用
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+package main
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+
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+import (
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+ "fmt"
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+ "net"
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+ "os"
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+ "sync"
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+ "time"
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+)
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+
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+func checkPort(ip net.IP, port int, wg *sync.WaitGroup) {
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+ tcpAddr := net.TCPAddr{
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+ IP: ip,
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+ Port: port,
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+ }
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+ ch := make(chan bool)
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+ timeout := make(chan bool)
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+ go func() {
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+ time.Sleep(3 * time.Second)
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+ timeout <- true
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+ }()
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+ go func() {
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+ conn, err := net.DialTCP("tcp", nil, &tcpAddr)
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+ ch <- true
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+ if err == nil {
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+ fmt.Printf("ip: %v port: %v \n", ip, port)
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+ defer func() {
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+ if conn != nil {
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+ e := conn.Close()
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+ if e != nil {
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+ fmt.Println(e)
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+ }
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+ }
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+ }()
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+ }
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+ }()
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+ select {
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+ case <-timeout:
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+ wg.Done()
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+ case <-ch:
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+ wg.Done()
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+ }
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+}
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+func checkIp(ip string) bool {
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+ if net.ParseIP(ip) == nil {
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+ fmt.Println("非法ip地址")
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+ return false
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+ } else {
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+ return true
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+ }
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+}
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+func main() {
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+
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+ startTime := time.Now()
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+ wg := sync.WaitGroup{}
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+ wg.Add(65534)
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+ ip := os.Args[1]
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+ if checkIp(ip) {
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+ for port := 1; port <= 65534; port++ {
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+ go checkPort(net.ParseIP(ip), port, &wg)
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+ }
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+ }
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+ wg.Wait()
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+ endTime := time.Now()
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+ fmt.Printf("执行时间 %v", endTime.Sub(startTime))
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+}
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