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
|
// Copyright 2008, Google Inc.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// 3. Neither the name of Google Inc. nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// We use the OSX system API function WirelessScanSplit. This function is not
// documented or included in the SDK, so we use a reverse-engineered header,
// osx_wifi_.h. This file is taken from the iStumbler project
// (http://www.istumbler.net).
// TODO(cprince): remove platform-specific #ifdef guards when OS-specific
// sources (e.g. WIN32_CPPSRCS) are implemented
#ifdef OS_MACOSX
#include "gears/geolocation/wifi_data_provider_osx.h"
#include <dlfcn.h>
#include <stdio.h>
#include "gears/base/common/string_utils.h"
#include "gears/geolocation/wifi_data_provider_common.h"
// The time periods, in milliseconds, between successive polls of the wifi data.
extern const int kDefaultPollingInterval = 120000; // 2 mins
extern const int kNoChangePollingInterval = 300000; // 5 mins
extern const int kTwoNoChangePollingInterval = 600000; // 10 mins
// static
template<>
WifiDataProviderImplBase *WifiDataProvider::DefaultFactoryFunction() {
return new OsxWifiDataProvider();
}
OsxWifiDataProvider::OsxWifiDataProvider() : is_first_scan_complete_(false) {
Start();
}
OsxWifiDataProvider::~OsxWifiDataProvider() {
stop_event_.Signal();
Join();
}
bool OsxWifiDataProvider::GetData(WifiData *data) {
assert(data);
MutexLock lock(&data_mutex_);
*data = wifi_data_;
// If we've successfully completed a scan, indicate that we have all of the
// data we can get.
return is_first_scan_complete_;
}
// Thread implementation
void OsxWifiDataProvider::Run() {
void *apple_80211_library = dlopen(
"/System/Library/PrivateFrameworks/Apple80211.framework/Apple80211",
RTLD_LAZY);
if (!apple_80211_library) {
is_first_scan_complete_ = true;
return;
}
WirelessAttach_function_ = reinterpret_cast<WirelessAttachFunction>(
dlsym(apple_80211_library, "WirelessAttach"));
WirelessScanSplit_function_ = reinterpret_cast<WirelessScanSplitFunction>(
dlsym(apple_80211_library, "WirelessScanSplit"));
WirelessDetach_function_ = reinterpret_cast<WirelessDetachFunction>(
dlsym(apple_80211_library, "WirelessDetach"));
assert(WirelessAttach_function_ &&
WirelessScanSplit_function_ &&
WirelessDetach_function_);
if ((*WirelessAttach_function_)(&wifi_context_, 0) != noErr) {
is_first_scan_complete_ = true;
return;
}
// Regularly get the access point data.
int polling_interval = kDefaultPollingInterval;
do {
WifiData new_data;
GetAccessPointData(&new_data.access_point_data);
bool update_available;
data_mutex_.Lock();
update_available = wifi_data_.DiffersSignificantly(new_data);
wifi_data_ = new_data;
data_mutex_.Unlock();
polling_interval =
UpdatePollingInterval(polling_interval, update_available);
if (update_available) {
is_first_scan_complete_ = true;
NotifyListeners();
}
} while (!stop_event_.WaitWithTimeout(polling_interval));
(*WirelessDetach_function_)(wifi_context_);
dlclose(apple_80211_library);
}
void OsxWifiDataProvider::GetAccessPointData(
WifiData::AccessPointDataSet *access_points) {
assert(access_points);
assert(WirelessScanSplit_function_);
CFArrayRef managed_access_points = NULL;
CFArrayRef adhoc_access_points = NULL;
if ((*WirelessScanSplit_function_)(wifi_context_,
&managed_access_points,
&adhoc_access_points,
0) != noErr) {
return;
}
if (managed_access_points == NULL) {
return;
}
int num_access_points = CFArrayGetCount(managed_access_points);
for (int i = 0; i < num_access_points; ++i) {
const WirelessNetworkInfo *access_point_info =
reinterpret_cast<const WirelessNetworkInfo*>(
CFDataGetBytePtr(
reinterpret_cast<const CFDataRef>(
CFArrayGetValueAtIndex(managed_access_points, i))));
// Currently we get only MAC address, signal strength, channel
// signal-to-noise and SSID
// TODO(steveblock): Work out how to get age.
AccessPointData access_point_data;
access_point_data.mac_address =
MacAddressAsString16(access_point_info->macAddress);
// WirelessNetworkInfo::signal appears to be signal strength in dBm.
access_point_data.radio_signal_strength = access_point_info->signal;
access_point_data.channel = access_point_info->channel;
// WirelessNetworkInfo::noise appears to be noise floor in dBm.
access_point_data.signal_to_noise = access_point_info->signal -
access_point_info->noise;
std::string16 ssid;
if (UTF8ToString16(reinterpret_cast<const char*>(access_point_info->name),
access_point_info->nameLen,
&ssid)) {
access_point_data.ssid = ssid;
}
access_points->insert(access_point_data);
}
}
#endif // OS_MACOSX
|
