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//go:build windows
package hostos
import (
"os/exec"
"regexp"
"strconv"
)
const (
defaultDynamicFirst = 49152
defaultDynamicLast = 65535
)
var dynamicStart = regexp.MustCompile(`(?i)start\s*port\s*:\s*(\d+)`)
var dynamicCount = regexp.MustCompile(`(?i)number\s+of\s+ports\s*:\s*(\d+)`)
func LocalPortRange() (int, int, error) {
out, err := exec.Command("netsh", "int", "ipv4", "show", "dynamicport", "tcp").Output()
if err != nil {
return defaultDynamicFirst, defaultDynamicLast, nil
}
start := dynamicStart.FindStringSubmatch(string(out))
count := dynamicCount.FindStringSubmatch(string(out))
if start == nil || count == nil {
return defaultDynamicFirst, defaultDynamicLast, nil
}
first, err1 := strconv.Atoi(start[1])
n, err2 := strconv.Atoi(count[1])
if err1 != nil || err2 != nil || n < 1 {
return defaultDynamicFirst, defaultDynamicLast, nil
}
return first, first + n - 1, nil
}
