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
DeviceInfo()42 DeviceInfo::DeviceInfo()
43 : sockets_(new Sockets()),
44 rtnl_handler_(RTNLHandler::GetInstance()) {
45 }
46
~DeviceInfo()47 DeviceInfo::~DeviceInfo() {}
48
GetInstance()49 DeviceInfo* DeviceInfo::GetInstance() {
50 return g_dhcp_device_info.Pointer();
51 }
52
GetDeviceInfo(const std::string & interface_name,ByteString * mac_address,unsigned int * interface_index)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