github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/p2p/net_android.go (about)

     1  //go:build android
     2  
     3  /*
     4   * Copyright (C) 2021 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 p2p
    21  
    22  import (
    23  	"net"
    24  	"strings"
    25  
    26  	"github.com/rs/zerolog/log"
    27  )
    28  
    29  func defaultInterfaceAddress() string {
    30  	ifaces, err := net.Interfaces()
    31  	if err != nil {
    32  		log.Warn().Err(err).Msgf("Failed to get list of interfaces")
    33  		return ""
    34  	}
    35  
    36  	for _, i := range ifaces {
    37  		if ip := upAndRunning(i, "wlan"); ip != "" {
    38  			return ip
    39  		}
    40  	}
    41  
    42  	for _, i := range ifaces {
    43  		if ip := upAndRunning(i, "rmnet"); ip != "" {
    44  			return ip
    45  		}
    46  	}
    47  
    48  	return ""
    49  }
    50  
    51  func upAndRunning(iface net.Interface, prefix string) string {
    52  	if !strings.HasPrefix(iface.Name, prefix) {
    53  		return ""
    54  	}
    55  
    56  	if !strings.Contains(iface.Flags.String(), "up") {
    57  		return ""
    58  	}
    59  
    60  	i, err := net.InterfaceByName(iface.Name)
    61  	if err != nil {
    62  		log.Warn().Err(err).Msgf("Failed to get interface by name: %s", iface.Name)
    63  		return ""
    64  	}
    65  
    66  	addrs, err := i.Addrs()
    67  	if err != nil {
    68  		log.Warn().Err(err).Msgf("Failed to get interface addresses: %s", iface.Name)
    69  		return ""
    70  	}
    71  
    72  	for _, addr := range addrs {
    73  		ip, _, err := net.ParseCIDR(addr.String())
    74  		if err != nil {
    75  			log.Warn().Err(err).Msgf("Failed to get interface addresses: %s", iface.Name)
    76  			return ""
    77  		}
    78  
    79  		if ip.To4() == nil {
    80  			return ""
    81  		}
    82  
    83  		return ip.String()
    84  	}
    85  	return ""
    86  }