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port.go
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port.go
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package socks5
import (
"errors"
"net"
"strconv"
"strings"
)
// GetRandomPort return a random port by specific network.
// The network must be "tcp", "udp".
func GetRandomPort(network string) (err error, port uint16) {
network = strings.ToLower(network)
addr := "0.0.0.0:0"
switch network {
case "tcp", "tcp4", "tcp6":
tcpAddr, err := net.ResolveTCPAddr(network, addr)
if err != nil {
return err, 0
}
ln, err := net.ListenTCP(network, tcpAddr)
if err != nil {
return err, 0
}
_, portStr, err := net.SplitHostPort(ln.Addr().String())
p, err := strconv.Atoi(portStr)
port = uint16(p)
err = ln.Close()
if err != nil {
return err, 0
}
return err, port
case "udp", "udp4", "udp6":
udpAddr, err := net.ResolveUDPAddr(network, addr)
if err != nil {
return err, 0
}
ln, err := net.ListenUDP(network, udpAddr)
if err != nil {
return err, 0
}
_, portStr, err := net.SplitHostPort(ln.LocalAddr().String())
p, err := strconv.Atoi(portStr)
port = uint16(p)
err = ln.Close()
if err != nil {
return err, 0
}
return err, port
default:
return errors.New("unknown network type " + network), 0
}
}
// IsFreePort indicates the port is available.
// The network must be "tcp", "udp".
func IsFreePort(network string, port uint16) error {
network = strings.ToLower(network)
portStr := strconv.Itoa(int(port))
addr := "0.0.0.0:" + portStr
switch network {
case "tcp":
tcpAddr, err := net.ResolveTCPAddr(network, addr)
if err != nil {
return err
}
ln, err := net.ListenTCP(network, tcpAddr)
if err != nil {
return err
}
ln.Close()
if err != nil {
return err
}
return nil
case "udp":
udpAddr, err := net.ResolveUDPAddr(network, addr)
if err != nil {
return err
}
ln, err := net.ListenUDP(network, udpAddr)
if err != nil {
return err
}
ln.Close()
if err != nil {
return err
}
return nil
default:
return errors.New("unknown network type " + network)
}
}