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package sockaddr
import (
"errors"
"os/exec"
)
type routeInfo struct {
cmds map[string][]string
}
// NewRouteInfo returns a Linux-specific implementation of the RouteInfo
// interface.
func NewRouteInfo() (routeInfo, error) {
// CoreOS Container Linux moved ip to /usr/bin/ip, so look it up on
// $PATH and fallback to /sbin/ip on error.
path, _ := exec.LookPath("ip")
if path == "" {
path = "/sbin/ip"
}
return routeInfo{
cmds: map[string][]string{"ip": {path, "route"}},
}, 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(ri.cmds["ip"][0], ri.cmds["ip"][1:]...).Output()
if err != nil {
return "", err
}
var ifName string
if ifName, err = parseDefaultIfNameFromIPCmd(string(out)); err != nil {
return "", errors.New("No default interface found")
}
return ifName, nil
}
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