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|
//go:build linux
// +build linux
package gateway
import (
"fmt"
"io"
"net"
"os"
)
const (
// See http://man7.org/linux/man-pages/man8/route.8.html
file = "/proc/net/route"
)
func readRoutes() ([]byte, error) {
f, err := os.Open(file)
if err != nil {
return nil, fmt.Errorf("can't access %s", file)
}
defer f.Close()
bytes, err := io.ReadAll(f)
if err != nil {
return nil, fmt.Errorf("can't read %s", file)
}
return bytes, nil
}
func discoverGatewayOSSpecific() (ip net.IP, err error) {
bytes, err := readRoutes()
if err != nil {
return nil, err
}
return parseLinuxGatewayIP(bytes)
}
func discoverGatewayInterfaceOSSpecific() (ip net.IP, err error) {
bytes, err := readRoutes()
if err != nil {
return nil, err
}
return parseLinuxInterfaceIP(bytes)
}
|
