47 lines
907 B
Go
47 lines
907 B
Go
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//+build darwin
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package freeport
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import (
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"fmt"
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"os/exec"
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"regexp"
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"strconv"
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)
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/*
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$ sysctl net.inet.ip.portrange.first net.inet.ip.portrange.last
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net.inet.ip.portrange.first: 49152
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net.inet.ip.portrange.last: 65535
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*/
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const (
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ephPortFirst = "net.inet.ip.portrange.first"
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ephPortLast = "net.inet.ip.portrange.last"
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command = "sysctl"
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)
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var ephPortRe = regexp.MustCompile(`^\s*(\d+)\s+(\d+)\s*$`)
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func getEphemeralPortRange() (int, int, error) {
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cmd := exec.Command(command, "-n", ephPortFirst, ephPortLast)
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out, err := cmd.Output()
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if err != nil {
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return 0, 0, err
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}
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val := string(out)
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m := ephPortRe.FindStringSubmatch(val)
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if m != nil {
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min, err1 := strconv.Atoi(m[1])
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max, err2 := strconv.Atoi(m[2])
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if err1 == nil && err2 == nil {
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return min, max, nil
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}
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}
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return 0, 0, fmt.Errorf("unexpected sysctl value %q for keys %q %q", val, ephPortFirst, ephPortLast)
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}
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