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00039 #include "NetworkChangeDetection.h"
00040
00041 namespace ariba {
00042 namespace communication {
00043
00044 use_logging_cpp(NetworkChangeDetection);
00045 SystemEventType NetworkChangeDetectionEventType("NetworkChangeDetectionEventType");
00046
00047 NetworkChangeDetection::NetworkChangeDetection()
00048 : running( false ), monitoringThread( NULL ), routingSocket( -1 ){
00049 startMonitoring();
00050 }
00051
00052 NetworkChangeDetection::~NetworkChangeDetection(){
00053 stopMonitoring();
00054 }
00055
00056 void NetworkChangeDetection::registerNotification(NetworkChangeInterface* callback){
00057
00058 RegistrationList::iterator i = find(
00059 registrations.begin(), registrations.end(), callback );
00060
00061 if( i == registrations.end() )
00062 registrations.push_back( callback );
00063 }
00064
00065 void NetworkChangeDetection::unregisterNotification(NetworkChangeInterface* callback){
00066
00067 RegistrationList::iterator i = find(
00068 registrations.begin(), registrations.end(), callback );
00069
00070 if( i != registrations.end() )
00071 registrations.erase( i );
00072 }
00073
00074 void NetworkChangeDetection::startMonitoring(){
00075
00076 logging_debug( "starting network change monitoring ..." );
00077
00078 running = true;
00079 monitoringThread = new boost::thread(
00080 boost::bind(&NetworkChangeDetection::monitoringThreadFunc, this) );
00081 }
00082
00083 void NetworkChangeDetection::stopMonitoring(){
00084
00085 logging_debug( "stopping network change monitoring ..." );
00086
00087
00088 running = false;
00089
00090 shutdown( routingSocket, SHUT_RDWR );
00091 close( routingSocket );
00092
00093
00094 monitoringThread->join();
00095
00096 delete monitoringThread;
00097 monitoringThread = NULL;
00098 }
00099
00100 void NetworkChangeDetection::monitoringThreadFunc(NetworkChangeDetection* obj){
00101
00102
00103
00104
00105
00106
00107
00108
00109
00110
00111
00112
00113
00114
00115
00116
00117
00118
00119
00120
00121
00122 obj->routingSocket = socket( PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE );
00123 if( obj->routingSocket < 0 ){
00124 logging_error("could not connect to routing socket: " +
00125 string(strerror(errno)));
00126 return;
00127 }
00128
00129
00130
00131
00132
00133
00134
00135
00136 struct timeval tv;
00137 tv.tv_sec = 1;
00138 tv.tv_usec = 0;
00139
00140 setsockopt( obj->routingSocket, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv) );
00141
00142
00143
00144
00145
00146
00147
00148 struct sockaddr_nl addr;
00149 memset( &addr, 0, sizeof(addr) );
00150 addr.nl_family = AF_NETLINK;
00151 addr.nl_groups = RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR | RTMGRP_LINK;
00152 addr.nl_pid = getpid();
00153
00154 int ret = bind( obj->routingSocket, (struct sockaddr*)&addr, sizeof(addr) );
00155 if( ret < 0 ){
00156 close( obj->routingSocket );
00157 logging_error( "could not bind routing socket: " + string(strerror(errno)) );
00158 return;
00159 }
00160
00161
00162
00163
00164
00165 logging_debug( "network change monitoring started" );
00166
00167 while( obj->running ){
00168
00169 char buffer[1024];
00170 struct nlmsghdr* header = (struct nlmsghdr*)buffer;
00171
00172 int bytesRead = recv( obj->routingSocket, &buffer, sizeof(buffer), 0 );
00173
00174 if( bytesRead < 0 ){
00175
00176
00177 if( errno == EWOULDBLOCK ) continue;
00178
00179
00180 if( errno == EBADF ) return;
00181
00182
00183 if( errno == EAGAIN || errno == EINTR ) return;
00184
00185
00186 logging_error( "could not read from routing socket: " +
00187 string(strerror(errno)) );
00188 break;
00189 }
00190
00191 for( ; bytesRead > 0; header = NLMSG_NEXT(header, bytesRead)) {
00192 if (!NLMSG_OK(header, (size_t)bytesRead) ||
00193 (size_t) bytesRead < sizeof(struct nlmsghdr) ||
00194 (size_t) bytesRead < (size_t)header->nlmsg_len) {
00195 continue;
00196 }
00197
00198
00199
00200 if(header->nlmsg_pid == 0) continue;
00201
00202
00203
00204
00205
00206
00207
00208 NetworkChangeInterface::NetworkChangeInfo changeInfo;
00209
00210 switch( header->nlmsg_type ){
00211
00212
00213
00214
00215
00216
00217 case RTM_NEWADDR:
00218 case RTM_DELADDR:
00219
00220 changeInfo = obj->extractAddressEvent( header );
00221 break;
00222
00223
00224
00225
00226
00227
00228 default: break;
00229
00230 }
00231
00232 logging_info( "network change detected: [" << changeInfo << "]" );
00233
00234
00235
00236
00237
00238 SystemQueue::instance().scheduleEvent(
00239 SystemEvent( obj, NetworkChangeDetectionEventType,
00240 new NetworkChangeInterface::NetworkChangeInfo(changeInfo)));
00241
00242 }
00243 }
00244
00245 logging_debug( "network change monitoring stopped" );
00246 }
00247
00248 NetworkChangeInterface::NetworkChangeInfo NetworkChangeDetection::extractAddressEvent(struct nlmsghdr* header){
00249 NetworkChangeInterface::NetworkChangeInfo changeInfo;
00250
00251
00252
00253
00254
00255
00256 if( header->nlmsg_type == RTM_NEWADDR ){
00257 logging_debug("network change message RTM_NEWADDR");
00258 changeInfo.type = NetworkChangeInterface::EventTypeInterfaceUp;
00259 }else if( header->nlmsg_type == RTM_DELADDR ){
00260 logging_debug("network change message RTM_DELADDR");
00261 changeInfo.type = NetworkChangeInterface::EventTypeInterfaceDown;
00262 }
00263
00264 struct ifaddrmsg* detailAddr = (struct ifaddrmsg*)NLMSG_DATA(header);
00265 changeInfo.interface = networkInformation.getInterface( detailAddr->ifa_index );
00266
00267 return changeInfo;
00268 }
00269
00270 void NetworkChangeDetection::handleSystemEvent(const SystemEvent& event){
00271
00272 NetworkChangeInterface::NetworkChangeInfo* changeInfo = event.getData<NetworkChangeInterface::NetworkChangeInfo>();
00273 const NetworkChangeDetection* obj = (const NetworkChangeDetection*)event.getListener();
00274
00275 RegistrationList::const_iterator i = obj->registrations.begin();
00276 RegistrationList::const_iterator iend = obj->registrations.end();
00277
00278 for( ; i != iend; i++ )
00279 (*i)->onNetworkChange(*changeInfo);
00280
00281 delete changeInfo;
00282 }
00283
00284 }}