1 // 2 // Copyright (C) 2015 The Android Open Source Project 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #include "dhcp_client/device_info.h" 18 19 #include <net/if.h> 20 #include <netinet/in.h> 21 #include <sys/ioctl.h> 22 23 #include <memory> 24 #include <string> 25 26 #include <base/logging.h> 27 28 using shill::ByteString; 29 using shill::Sockets; 30 using shill::RTNLHandler; 31 using std::unique_ptr; 32 33 namespace { 34 35 base::LazyInstance<dhcp_client::DeviceInfo> g_dhcp_device_info 36 = LAZY_INSTANCE_INITIALIZER; 37 38 } // namespace 39 40 namespace dhcp_client { 41 42 DeviceInfo::DeviceInfo() 43 : sockets_(new Sockets()), 44 rtnl_handler_(RTNLHandler::GetInstance()) { 45 } 46 47 DeviceInfo::~DeviceInfo() {} 48 49 DeviceInfo* DeviceInfo::GetInstance() { 50 return g_dhcp_device_info.Pointer(); 51 } 52 53 bool DeviceInfo::GetDeviceInfo(const std::string& interface_name, 54 ByteString* mac_address, 55 unsigned int* interface_index ) { 56 struct ifreq ifr; 57 size_t if_name_len = interface_name.size(); 58 if (if_name_len > IFNAMSIZ) { 59 LOG(ERROR) << "Interface name is too long."; 60 return false; 61 } 62 memcpy(ifr.ifr_name, interface_name.c_str(), if_name_len); 63 ifr.ifr_name[if_name_len] = 0; 64 int fd = sockets_->Socket(AF_INET, SOCK_DGRAM, 0); 65 if (fd == -1) { 66 PLOG(ERROR) << "Failed to create socket."; 67 return false; 68 } 69 70 shill::ScopedSocketCloser socket_closer(sockets_.get(), fd); 71 // Get interface hardware address 72 if (sockets_->Ioctl(fd, SIOCGIFHWADDR, &ifr) == -1) { 73 PLOG(ERROR) << "Failed to get interface hardware address."; 74 return false; 75 } 76 int if_index = rtnl_handler_->GetInterfaceIndex(interface_name); 77 if (if_index == -1) { 78 LOG(ERROR) << "Unable to get interface index."; 79 return false; 80 } 81 *interface_index = if_index; 82 *mac_address = ByteString(ifr.ifr_hwaddr.sa_data, IFHWADDRLEN); 83 84 return true; 85 } 86 87 } // namespace dhcp_client 88 89
