Some code reorg

cmd/jailhost.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"golang.org/x/net/route"
 	"net"
+	"regexp"
+	"strings"
 )
 
 var defaultRoute4 = [4]byte{0, 0, 0, 0}
@@ -103,3 +105,22 @@ func (jh *JailHost) GetDefaultGateway6() string {
 	}
 	return jh.default_gateway6
 }
+
+func getHostInUseIPv4() ([]string, error) {
+	var ips []string
+
+	re := regexp.MustCompile(ifconfigipv4re)
+
+	out, err := executeCommand("/sbin/ifconfig")
+	if err != nil {
+		return ips, fmt.Errorf("ERROR executing \"/sbin/ifconfig\": %s", err)
+	}
+
+	for _, line := range strings.Split(out, "\n") {
+		if re.MatchString(line) {
+			ips = append(ips, re.FindStringSubmatch(line)[1])
+		}
+	}
+
+	return ips, nil
+}