GoLand编写 TCP 端口扫描器的详细过程（golang接口测试框架）快来看

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package main
import (
“fmt”
“net”
“sort”
)
func worker(ports chan int, results chan int) {
for p :=range ports {
address :=fmt.Sprintf(“20.194.168.28:%d”, p)
conn, err :=net.Dial(“tcp”, address)
if err !=nil {
results <- 0
continue
}
conn.Close()
results <- p
}
}
func main() {
ports :=make(chan int, 100)
results :=make(chan int)
var openports []int
var closeports []int
for i :=0; i < cap(ports); i++ {
go worker(ports, results)
}
go func() {
for i :=1; i < 1024; i++ {
ports <- i
}
}()
for i :=1; i < 1024; i++ {
port :=<-results
if port !=0 {
openports=append(openports, port)
} else {
closeports=append(closeports, port)
}
}
close(ports)
close(results)
sort.Ints(openports)
sort.Ints(closeports)
for _, port :=range closeports {
fmt.Printf(“%d closed\n”, port)
}
for _, port :=range openports {
fmt.Printf(“%d opened\n”, port)
}
}
// func main() {
// start :=time.Now()
// var wg sync.WaitGroup
// for i :=21; i < 120; i++ {
// wg.Add(1)
// go func(j int) {
// defer wg.Done()
// address :=fmt.Sprintf(“20.194.168.28:%d”, j)
// conn, err :=net.Dial(“tcp”, address)
// if err !=nil {
// fmt.Printf(“%s 关闭了\n”, address)
// return
// }
// conn.Close()
// fmt.Printf(“%s 打开了！！！\n”, address)
// }(i)
// }
// wg.Wait()
// elapsed :=time.Since(start) / 1e9
// fmt.Printf(“\n\n%d seconds”, elapsed)
// }
// func main() {
// for i :=21; i < 120; i++ {
// address :=fmt.Sprintf(“20.194.168.28:%d”, i)
// conn, err :=net.Dial(“tcp”, address)
// if err !=nil {
// fmt.Printf(“%s failed 关闭了\n”, address)
// continue
// }
// conn.Close()
// fmt.Printf(“%s connected 打开了！！！\n”, address)
// }
// }