source: source/ariba/communication/networkinfo/NetworkInformation.cpp@ 4604

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// The Ariba-Underlay Copyright
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// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
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// UniversitÀt Karlsruhe (TH)
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// [License]

#include "NetworkInformation.h"

namespace ariba {
namespace communication {

use_logging_cpp(NetworkInformation);

NetworkInformation::NetworkInformation() : infoSocket( -1 ){

        infoSocket = socket( AF_INET, SOCK_DGRAM, 0 );
}

NetworkInformation::~NetworkInformation(){

        close( infoSocket );
}

NetworkInterfaceList NetworkInformation::getInterfaces(){

        NetworkInterfaceList retlist;

        //
        // get all network interfaces with basic information
        // and all addresses configured on the interface
        //

        // TODO: can be optimized using SIOCGIFCOUNT
        // but maybe this way its more robust?
        // TODO: or using if_nameindex() problem is here,
        // that i don't know the number of ifaces returned ...

        struct ifconf ifconf;
        int ifnum = 5;
        int lastlen = 0;

        ifconf.ifc_buf = NULL;
        ifconf.ifc_len = 0;

        while( true ){

                ifconf.ifc_len = sizeof(struct ifreq) * ifnum;
                ifconf.ifc_buf = (char*)realloc( ifconf.ifc_buf, ifconf.ifc_len );

                int ret = ioctl( infoSocket, SIOCGIFCONF, &ifconf );
                if (ret < 0){
                        logging_error( "getting interface list failed with: " <<
                                                strerror(errno));
                        return retlist;
                }

                if( ifconf.ifc_len > lastlen ){
                        lastlen = ifconf.ifc_len;
                        ifnum += 10;
                        continue;
                }

                break; // length did not change any more, success
        }

        struct ifreq* ifr = ifconf.ifc_req;

        for (int i = 0; i<ifconf.ifc_len; i+=sizeof(struct ifreq), ifr++){
                NetworkInterface interface;
                interface.name = string( ifr->ifr_name );
                retlist.push_back( interface );
        }

        free( ifconf.ifc_buf );

        //
        // SIOCGIFCONF does not return interfaces that are currently
        // not running. therefore we try to complete the list of interfaces now
        // using getifaddrs. but we can't use _only_ getifaddrs, because
        // it only contains an interface it it has an address configured
        //

        struct ifaddrs* ifap;
        getifaddrs( &ifap );

        for( struct ifaddrs* p = ifap; p != NULL; p=p->ifa_next ){
                NetworkInterface interface;
                interface.name = string( p->ifa_name );

                if( find(retlist.begin(), retlist.end(), interface) == retlist.end() )
                        retlist.push_back( interface );
        }

        freeifaddrs( ifap );

        //
        // now we start to complete the interface information.
        // we can't just call al IO ctrls and then get the
        // information, as some vars of the ifreq structure
        // hold several values, depending on the request
        // see /usr/include/net/if.h

        NetworkInterfaceList::iterator i = retlist.begin();
        NetworkInterfaceList::iterator iend = retlist.end();

        for( ; i != iend; i++ ){

                NetworkInterface* interface = &(*i);
                struct ifreq ifr;

                memset( &ifr, 0, sizeof(struct ifreq) );
                strcpy( ifr.ifr_name, i->name.c_str() );


                { // get interface index
                        if( ioctl(infoSocket, SIOCGIFINDEX, &ifr) ){
                                logging_error( "could not get interface index for " <<
                                                i->name << ": " << strerror(errno) );
                                return retlist;
                        }

                        interface->index = ifr.ifr_ifindex;
                }

                { // get interface flags
                        if( ioctl(infoSocket, SIOCGIFFLAGS, &ifr) ){
                                logging_error( "could not get interface flags for " <<
                                                i->name << ": " << strerror(errno) );
                                return retlist;
                        }

                        interface->isRunning   = (ifr.ifr_flags & IFF_RUNNING)   != 0 ? true : false;
                        interface->isUp        = (ifr.ifr_flags & IFF_UP)        != 0 ? true : false;
                        interface->isLoopback  = (ifr.ifr_flags & IFF_LOOPBACK)  != 0 ? true : false;
                        interface->isBroadcast = (ifr.ifr_flags & IFF_BROADCAST) != 0 ? true : false;
                        interface->isMulticast = (ifr.ifr_flags & IFF_MULTICAST) != 0 ? true : false;
                }

                { // get mtu
                        if( ioctl(infoSocket, SIOCGIFMTU, &ifr) ){
                                logging_error( "could not get mtu for " <<
                                                i->name << ": " << strerror(errno) );
                                return retlist;
                        }

                        interface->mtu = ifr.ifr_mtu;
                }

                { // get tx queue length
                        if( ioctl(infoSocket, SIOCGIFTXQLEN, &ifr) ){
                                logging_error( "could not get tx queue length for " <<
                                                i->name << ": " << strerror(errno) );
                                return retlist;
                        }

                        interface->txQueueLen = ifr.ifr_qlen;
                }

        } // for( ; i != iend; i++ )*/

        return retlist;
}

NetworkInterface NetworkInformation::getInterface(int index){

        NetworkInterfaceList ifaces = getInterfaces();
        NetworkInterfaceList::iterator i = ifaces.begin();
        NetworkInterfaceList::iterator iend = ifaces.end();

        for( ; i != iend; i++ ){
                if( i->index == index ) return *i;
        }

        return NetworkInterface::UNDEFINED;
}

NetworkInterface NetworkInformation::getInterface(string name){

        NetworkInterfaceList ifaces = getInterfaces();
        NetworkInterfaceList::iterator i = ifaces.begin();
        NetworkInterfaceList::iterator iend = ifaces.end();

        for( ; i != iend; i++ ){
                if( i->name.compare(name) == 0 ) return *i;
        }

        return NetworkInterface::UNDEFINED;
}

}} // namespace ariba, communication