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91 lines
1.6 KiB
91 lines
1.6 KiB
package network
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import (
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"crypto/rand"
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"math/big"
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"net"
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"strconv"
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)
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/**
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扫描本机空闲端口
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参数说明：
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startPort 扫描开始端口 不包含这个端口
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endPort 扫描结束端口 不包含这个端口
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count 扫描端口数量
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*/
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func ScanPort(startPort, endPort int64, count int) []int64 {
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usePort := make([]int64, 0)
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for startPort < endPort {
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startPort = startPort + 1
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udpserver, err := net.ResolveUDPAddr("udp", ":"+strconv.FormatInt(int64(startPort), 10))
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if err != nil {
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continue
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}
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udpConn, err := net.ListenUDP("udp", udpserver)
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if err != nil {
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continue
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}
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udpConn.Close()
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ln, err := net.Listen("tcp", "0.0.0.0:"+strconv.FormatInt(int64(startPort), 10))
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if err != nil {
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continue
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}
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usePort = append(usePort, startPort)
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ln.Close()
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if len(usePort) >= count {
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break
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}
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}
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return usePort
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}
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/**
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* 取随机端口
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*/
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func RandPort(min, max int64) int64 {
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var port int64
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for {
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port = RandInt64(min, max)
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udpserver, err := net.ResolveUDPAddr("udp", ":"+strconv.FormatInt(int64(port), 10))
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if err != nil {
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continue
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}
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udpConn, err := net.ListenUDP("udp", udpserver)
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if err != nil {
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continue
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}
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udpConn.Close()
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ln, err := net.Listen("tcp", "0.0.0.0:"+strconv.FormatInt(int64(port), 10))
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if err != nil {
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continue
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}
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ln.Close()
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break
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}
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return port
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}
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/**
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* 取随机数
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*/
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func RandInt64(min, max int64) int64 {
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var randnum int64
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for {
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maxBigInt := big.NewInt(max)
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i, _ := rand.Int(rand.Reader, maxBigInt)
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if i.Int64() > min {
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randnum = i.Int64()
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break
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}
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}
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return randnum
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}
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