1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
// Copyright (c) 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/network_interfaces_linux.h"
#if !defined(OS_ANDROID)
#include <linux/ethtool.h>
#endif // !defined(OS_ANDROID)
#include <linux/if.h>
#include <linux/sockios.h>
#include <linux/wireless.h>
#include <set>
#include <sys/ioctl.h>
#include <sys/types.h>
#include "base/files/file_path.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "base/threading/thread_restrictions.h"
#include "net/base/address_tracker_linux.h"
#include "net/base/escape.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/base/network_interfaces_posix.h"
#include "url/gurl.h"
namespace net {
namespace {
// When returning true, the platform native IPv6 address attributes were
// successfully converted to net IP address attributes. Otherwise, returning
// false and the caller should drop the IP address which can't be used by the
// application layer.
bool TryConvertNativeToNetIPAttributes(int native_attributes,
int* net_attributes) {
// For Linux/ChromeOS/Android, we disallow addresses with attributes
// IFA_F_OPTIMISTIC, IFA_F_DADFAILED, and IFA_F_TENTATIVE as these
// are still progressing through duplicated address detection (DAD)
// and shouldn't be used by the application layer until DAD process
// is completed.
if (native_attributes & (
#if !defined(OS_ANDROID)
IFA_F_OPTIMISTIC | IFA_F_DADFAILED |
#endif // !OS_ANDROID
IFA_F_TENTATIVE)) {
return false;
}
if (native_attributes & IFA_F_TEMPORARY) {
*net_attributes |= IP_ADDRESS_ATTRIBUTE_TEMPORARY;
}
if (native_attributes & IFA_F_DEPRECATED) {
*net_attributes |= IP_ADDRESS_ATTRIBUTE_DEPRECATED;
}
return true;
}
} // namespace
namespace internal {
inline const unsigned char* GetIPAddressData(const IPAddressNumber& ip) {
return ip.data();
}
// Gets the connection type for interface |ifname| by checking for wireless
// or ethtool extensions.
NetworkChangeNotifier::ConnectionType GetInterfaceConnectionType(
const std::string& ifname) {
base::ScopedFD s(socket(AF_INET, SOCK_STREAM, 0));
if (!s.is_valid())
return NetworkChangeNotifier::CONNECTION_UNKNOWN;
// Test wireless extensions for CONNECTION_WIFI
struct iwreq pwrq = {};
strncpy(pwrq.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
if (ioctl(s.get(), SIOCGIWNAME, &pwrq) != -1)
return NetworkChangeNotifier::CONNECTION_WIFI;
#if !defined(OS_ANDROID)
// Test ethtool for CONNECTION_ETHERNET
struct ethtool_cmd ecmd = {};
ecmd.cmd = ETHTOOL_GSET;
struct ifreq ifr = {};
ifr.ifr_data = &ecmd;
strncpy(ifr.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
if (ioctl(s.get(), SIOCETHTOOL, &ifr) != -1)
return NetworkChangeNotifier::CONNECTION_ETHERNET;
#endif // !defined(OS_ANDROID)
return NetworkChangeNotifier::CONNECTION_UNKNOWN;
}
std::string GetInterfaceSSID(const std::string& ifname) {
base::ScopedFD ioctl_socket(socket(AF_INET, SOCK_DGRAM, 0));
if (!ioctl_socket.is_valid())
return "";
struct iwreq wreq = {};
strncpy(wreq.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
char ssid[IW_ESSID_MAX_SIZE + 1] = {0};
wreq.u.essid.pointer = ssid;
wreq.u.essid.length = IW_ESSID_MAX_SIZE;
if (ioctl(ioctl_socket.get(), SIOCGIWESSID, &wreq) != -1)
return ssid;
return "";
}
bool GetNetworkListImpl(
NetworkInterfaceList* networks,
int policy,
const base::hash_set<int>& online_links,
const internal::AddressTrackerLinux::AddressMap& address_map,
GetInterfaceNameFunction get_interface_name) {
std::map<int, std::string> ifnames;
for (internal::AddressTrackerLinux::AddressMap::const_iterator it =
address_map.begin();
it != address_map.end(); ++it) {
// Ignore addresses whose links are not online.
if (online_links.find(it->second.ifa_index) == online_links.end())
continue;
sockaddr_storage sock_addr;
socklen_t sock_len = sizeof(sockaddr_storage);
// Convert to sockaddr for next check.
if (!IPEndPoint(it->first, 0)
.ToSockAddr(reinterpret_cast<sockaddr*>(&sock_addr), &sock_len)) {
continue;
}
// Skip unspecified addresses (i.e. made of zeroes) and loopback addresses
if (IsLoopbackOrUnspecifiedAddress(reinterpret_cast<sockaddr*>(&sock_addr)))
continue;
int ip_attributes = IP_ADDRESS_ATTRIBUTE_NONE;
if (it->second.ifa_family == AF_INET6) {
// Ignore addresses whose attributes are not actionable by
// the application layer.
if (!TryConvertNativeToNetIPAttributes(it->second.ifa_flags,
&ip_attributes))
continue;
}
// Find the name of this link.
std::map<int, std::string>::const_iterator itname =
ifnames.find(it->second.ifa_index);
std::string ifname;
if (itname == ifnames.end()) {
char buffer[IFNAMSIZ] = {0};
ifname.assign(get_interface_name(it->second.ifa_index, buffer));
// Ignore addresses whose interface name can't be retrieved.
if (ifname.empty())
continue;
ifnames[it->second.ifa_index] = ifname;
} else {
ifname = itname->second;
}
// Based on the interface name and policy, determine whether we
// should ignore it.
if (ShouldIgnoreInterface(ifname, policy))
continue;
NetworkChangeNotifier::ConnectionType type =
GetInterfaceConnectionType(ifname);
networks->push_back(
NetworkInterface(ifname, ifname, it->second.ifa_index, type, it->first,
it->second.ifa_prefixlen, ip_attributes));
}
return true;
}
std::string GetWifiSSIDFromInterfaceListInternal(
const NetworkInterfaceList& interfaces,
internal::GetInterfaceSSIDFunction get_interface_ssid) {
std::string connected_ssid;
for (size_t i = 0; i < interfaces.size(); ++i) {
if (interfaces[i].type != NetworkChangeNotifier::CONNECTION_WIFI)
return "";
std::string ssid = get_interface_ssid(interfaces[i].name);
if (i == 0) {
connected_ssid = ssid;
} else if (ssid != connected_ssid) {
return "";
}
}
return connected_ssid;
}
} // namespace internal
bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
if (networks == NULL)
return false;
internal::AddressTrackerLinux tracker;
tracker.Init();
return internal::GetNetworkListImpl(
networks, policy, tracker.GetOnlineLinks(), tracker.GetAddressMap(),
&internal::AddressTrackerLinux::GetInterfaceName);
}
std::string GetWifiSSID() {
NetworkInterfaceList networks;
if (GetNetworkList(&networks, INCLUDE_HOST_SCOPE_VIRTUAL_INTERFACES)) {
return internal::GetWifiSSIDFromInterfaceListInternal(
networks, internal::GetInterfaceSSID);
}
return "";
}
} // namespace net
|
