Merge pull request #7234 from derekmarcotte/dm-freebsd

Fix undefined: getEphemeralPortRange error on FreeBSD.

helper/freeport/ephemeral_freebsd.go

@@ -0,0 +1,46 @@
+//+build freebsd
+
+package freeport
+
+import (
+	"fmt"
+	"os/exec"
+	"regexp"
+	"strconv"
+)
+
+/*
+$ sysctl net.inet.ip.portrange.first net.inet.ip.portrange.last
+net.inet.ip.portrange.first: 49152
+net.inet.ip.portrange.last: 65535
+*/
+
+const (
+	ephPortFirst = "net.inet.ip.portrange.first"
+	ephPortLast  = "net.inet.ip.portrange.last"
+	command      = "sysctl"
+)
+
+var ephPortRe = regexp.MustCompile(`^\s*(\d+)\s+(\d+)\s*$`)
+
+func getEphemeralPortRange() (int, int, error) {
+	cmd := exec.Command(command, "-n", ephPortFirst, ephPortLast)
+	out, err := cmd.Output()
+	if err != nil {
+		return 0, 0, err
+	}
+
+	val := string(out)
+
+	m := ephPortRe.FindStringSubmatch(val)
+	if m != nil {
+		min, err1 := strconv.Atoi(m[1])
+		max, err2 := strconv.Atoi(m[2])
+
+		if err1 == nil && err2 == nil {
+			return min, max, nil
+		}
+	}
+
+	return 0, 0, fmt.Errorf("unexpected sysctl value %q for keys %q %q", val, ephPortFirst, ephPortLast)
+}