github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/utils/netutil/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 netutil
    21  
    22  import (
    23  	"net"
    24  	"os/exec"
    25  	"strings"
    26  
    27  	"github.com/rs/zerolog/log"
    28  
    29  	"github.com/mysteriumnetwork/node/utils/cmdutil"
    30  )
    31  
    32  func assignIP(iface string, subnet net.IPNet) error {
    33  	if err := cmdutil.SudoExec("ip", "address", "replace", "dev", iface, subnet.String()); err != nil {
    34  		return err
    35  	}
    36  	return cmdutil.SudoExec("ip", "link", "set", "dev", iface, "up")
    37  }
    38  
    39  func excludeRoute(ip, gw net.IP) error {
    40  	return cmdutil.SudoExec("ip", "route", "add", ip.String(), "via", gw.String())
    41  }
    42  
    43  func deleteRoute(ip, gw string) error {
    44  	return cmdutil.SudoExec("ip", "route", "delete", ip, "via", gw)
    45  }
    46  
    47  func addDefaultRoute(iface string) error {
    48  	if err := cmdutil.SudoExec("ip", "route", "add", "0.0.0.0/1", "dev", iface); err != nil {
    49  		return err
    50  	}
    51  
    52  	if err := cmdutil.SudoExec("ip", "route", "add", "128.0.0.0/1", "dev", iface); err != nil {
    53  		return err
    54  	}
    55  
    56  	if ipv6Enabled() {
    57  		if err := cmdutil.SudoExec("ip", "-6", "route", "add", "::/1", "dev", iface); err != nil {
    58  			return err
    59  		}
    60  
    61  		if err := cmdutil.SudoExec("ip", "-6", "route", "add", "8000::/1", "dev", iface); err != nil {
    62  			return err
    63  		}
    64  	}
    65  
    66  	return nil
    67  }
    68  
    69  func logNetworkStats() {
    70  	for _, args := range [][]string{{"iptables", "-L", "-n"}, {"iptables", "-L", "-n", "-t", "nat"}, {"ip", "route", "list"}, {"ip", "address", "list"}} {
    71  		out, err := exec.Command("sudo", args...).CombinedOutput()
    72  		logOutputToTrace(out, err, args...)
    73  	}
    74  }
    75  
    76  func ipv6Enabled() bool {
    77  	out, err := cmdutil.ExecOutput("sysctl", "net.ipv6.conf.all.disable_ipv6")
    78  	if err != nil {
    79  		log.Error().Err(err).Msg("Failed to detect if IPv6 disabled on the host")
    80  
    81  		return true
    82  	}
    83  
    84  	return strings.Contains(string(out), "net.ipv6.conf.all.disable_ipv6 = 0")
    85  }