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portallocator_linux.go

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package portallocator

import (

"bufio"

"fmt"

"os"

)

func getDynamicPortRange() (start int, end int, err error) {

const portRangeKernelParam = "/proc/sys/net/ipv4/ip_local_port_range"

portRangeFallback := fmt.Sprintf("using fallback port range %d-%d", defaultPortRangeStart, defaultPortRangeEnd)

file, err := os.Open(portRangeKernelParam)

if err != nil {

return 0, 0, fmt.Errorf("port allocator - %s due to error: %v", portRangeFallback, err)

}

defer file.Close()

n, err := fmt.Fscanf(bufio.NewReader(file), "%d\t%d", &start, &end)

if n != 2 || err != nil {

if err == nil {

err = fmt.Errorf("unexpected count of parsed numbers (%d)", n)

}

return 0, 0, fmt.Errorf("port allocator - failed to parse system ephemeral port range from %s - %s: %v", portRangeKernelParam, portRangeFallback, err)

}

return start, end, nil

}