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154230cdd7
The function used a `cmdErr` error, but it was discarded when returning an error. Also removing the named "err" return variable. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
42 lines
1.4 KiB
Go
42 lines
1.4 KiB
Go
package portallocator
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import (
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"bytes"
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"fmt"
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"os/exec"
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)
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func getDynamicPortRange() (start int, end int, _ error) {
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portRangeKernelSysctl := []string{"net.inet.ip.portrange.hifirst", "net.ip.portrange.hilast"}
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portRangeLowCmd := exec.Command("/sbin/sysctl", portRangeKernelSysctl[0])
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var portRangeLowOut bytes.Buffer
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portRangeLowCmd.Stdout = &portRangeLowOut
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err := portRangeLowCmd.Run()
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if err != nil {
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return 0, 0, fmt.Errorf("port allocator - sysctl net.inet.ip.portrange.hifirst failed: %v", err)
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}
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n, err := fmt.Sscanf(portRangeLowOut.String(), "%d", &start)
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if n != 1 || err != nil {
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if err == nil {
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err = fmt.Errorf("unexpected count of parsed numbers (%d)", n)
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}
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return 0, 0, fmt.Errorf("port allocator - failed to parse system ephemeral port range start from %s: %v", portRangeLowOut.String(), err)
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}
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portRangeHighCmd := exec.Command("/sbin/sysctl", portRangeKernelSysctl[1])
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var portRangeHighOut bytes.Buffer
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portRangeHighCmd.Stdout = &portRangeHighOut
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err = portRangeHighCmd.Run()
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if err != nil {
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return 0, 0, fmt.Errorf("port allocator - sysctl net.inet.ip.portrange.hilast failed: %v", err)
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}
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n, err = fmt.Sscanf(portRangeHighOut.String(), "%d", &end)
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if n != 1 || err != nil {
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if err == nil {
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err = fmt.Errorf("unexpected count of parsed numbers (%d)", n)
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}
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return 0, 0, fmt.Errorf("port allocator - failed to parse system ephemeral port range end from %s: %v", portRangeHighOut.String(), err)
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}
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return start, end, nil
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}
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