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package sockaddr
import (
"errors"
"os/exec"
)
var cmds map[string][]string = map[string][]string{
"route": {"/usr/sbin/route", "-n", "get", "default"},
}
type routeInfo struct {
cmds map[string][]string
}
// NewRouteInfo returns a BSD-specific implementation of the RouteInfo
// interface.
func NewRouteInfo() (routeInfo, error) {
return routeInfo{
cmds: cmds,
}, nil
}
// GetDefaultInterfaceName returns the interface name attached to the default
// route on the default interface.
func (ri routeInfo) GetDefaultInterfaceName() (string, error) {
out, err := exec.Command(cmds["route"][0], cmds["route"][1:]...).Output()
if err != nil {
return "", err
}
var ifName string
if ifName, err = parseDefaultIfNameFromRoute(string(out)); err != nil {
return "", errors.New("No default interface found")
}
return ifName, nil
}
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