96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
/*
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* devices.cpp
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*
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* Copyright (c) 2011 Arnout Engelen
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "devices.h"
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#include <iostream>
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#include <cstring>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <ifaddrs.h>
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bool selected(int devc, char** devicenames, char* devicename) {
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if (devc == 0)
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return true;
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for (int i = 0; i < devc; i++)
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if (strcmp(devicenames[i], devicename) == 0)
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return true;
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return false;
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}
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bool already_seen(device* devices, char* devicename) {
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for (class device* current_device = devices;
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current_device != NULL;
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current_device = current_device->next) {
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if (strcmp(current_device->name, devicename) == 0)
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return true;
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}
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return false;
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}
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// The interface is up, not a loopback and running?
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bool up_running(int ifa_flags) {
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return !(ifa_flags & IFF_LOOPBACK) &&
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(ifa_flags & IFF_UP) &&
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(ifa_flags & IFF_RUNNING);
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}
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/**
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* This function can return null, if no good interface is found
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* When 'all' is set to 'false', the function avoids loopback interface and down/not running interfaces
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*/
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device * get_devices(int devc, char** devicenames, bool all)
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{
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struct ifaddrs *ifaddr, *ifa;
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if (getifaddrs(&ifaddr) == -1)
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{
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std::cerr << "Fail to get interface addresses" << std::endl;
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// perror("getifaddrs");
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return NULL;
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}
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device* devices = NULL;
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for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next)
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{
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if (ifa->ifa_addr == NULL)
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continue;
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if (!selected(devc, devicenames, ifa->ifa_name))
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continue;
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if (already_seen(devices, ifa->ifa_name))
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continue;
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if (!all && !up_running(ifa->ifa_flags))
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continue;
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devices = new device(strdup(ifa->ifa_name),devices);
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}
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freeifaddrs(ifaddr);
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return devices;
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}
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device * get_default_devices() {
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return get_devices(0, NULL, false);
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}
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