github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/router/network/network_linux.go (about)

     1  //go:build linux && !android
     2  
     3  /*
     4   * Copyright (C) 2020 The "MysteriumNetwork/node" Authors.
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License as published by
     8   * the Free Software Foundation, either version 3 of the License, or
     9   * (at your option) any later version.
    10   *
    11   * This program is distributed in the hope that it will be useful,
    12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14   * GNU General Public License for more details.
    15   *
    16   * You should have received a copy of the GNU General Public License
    17   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    18   */
    19  
    20  package network
    21  
    22  import (
    23  	"net"
    24  	"os/exec"
    25  
    26  	"github.com/jackpal/gateway"
    27  )
    28  
    29  // RoutingTable implements a set of platform specific tool for creating, deleting
    30  // and observe routing tables rules for a different needs.
    31  type RoutingTable struct{}
    32  
    33  // DiscoverGateway returns system default gateway.
    34  func (t *RoutingTable) DiscoverGateway() (net.IP, error) {
    35  	return gateway.DiscoverGateway()
    36  }
    37  
    38  // ExcludeRule adds a single IP address to be excluded from the main tunnelled traffic.
    39  // Traffic sent to the IP address will be directed to the system default gaitway
    40  // instead of tunnel.
    41  func (t *RoutingTable) ExcludeRule(ip, gw net.IP) error {
    42  	_, err := exec.Command("sudo", "ip", "route", "add", ip.String(), "via", gw.String()).CombinedOutput()
    43  	if err != nil {
    44  		return err
    45  	}
    46  	return nil
    47  }
    48  
    49  // DeleteRule removes excluded routing table rule to return it back to routing
    50  // thought the tunnel.
    51  func (t *RoutingTable) DeleteRule(ip, gw net.IP) error {
    52  	_, err := exec.Command("sudo", "ip", "route", "delete", ip.String(), "via", gw.String()).CombinedOutput()
    53  	if err != nil {
    54  		return err
    55  	}
    56  	return nil
    57  }