45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
/*
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Copyright 2016 gtalent2@gmail.com
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This Source Code Form is subject to the terms of the Mozilla Public
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License, v. 2.0. If a copy of the MPL was not distributed with this
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file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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package main
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import (
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"bytes"
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"log"
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"os/exec"
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"strconv"
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)
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func setupPortForward(ruleName, ip, port string) {
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pfrule := "\"rdr pass on $ext_if proto { tcp, udp } from any to any port {" + port + "} -> " + ip + "\""
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in, err := exec.Command("pfctl", "-a", "\""+ruleName+"\"", "-f", "-").StdinPipe()
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defer in.Close()
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if err != nil {
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log.Println("Port Forwarding:", err)
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}
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_, err = in.Write([]byte(pfrule))
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if err != nil {
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log.Println("Port Forwarding:", err)
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}
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}
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func portUsageCount(ports ...int) int {
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cmd := "/usr/bin/sockstat"
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args := []string{"-4c"}
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for _, v := range ports {
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args = append(args, "-p")
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args = append(args, strconv.Itoa(v))
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}
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out, err := exec.Command(cmd, args...).Output()
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if err != nil {
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log.Println("Port Usage Check: Could not run \""+cmd+"\":", err)
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}
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return bytes.Count(out, []byte{'\n'}) - 1
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}
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