1 /* wireless_frame.cpp
2 *
3 * Wireshark - Network traffic analyzer
4 * By Gerald Combs <gerald@wireshark.org>
5 * Copyright 1998 Gerald Combs
6 *
7 * SPDX-License-Identifier: GPL-2.0-or-later
8 */
9
10 #include "wireless_frame.h"
11 #include <ui_wireless_frame.h>
12
13 #include "config.h"
14
15 #include <glib.h>
16
17 #include <capture/capture_session.h>
18 #include <capture/capture_sync.h>
19
20 #include <capture/ws80211_utils.h>
21
22 #include "ui/ws_ui_util.h"
23 #include <wsutil/utf8_entities.h>
24 #include <wsutil/802_11-utils.h>
25 #include "wireshark_application.h"
26
27 #include <QProcess>
28 #include <QAbstractItemView>
29
30 // To do:
31 // - Disable or hide invalid channel types.
32 // - Push more status messages ("switched to...") to the status bar.
33 // - Add a "Decrypt in the driver" checkbox?
34 // - Check for frequency and channel type changes.
35 // - Find something appropriate to run from the helperToolButton on Linux.
36
37 // Questions:
38 // - From our perspective, what's the difference between "NOHT" and "HT20"?
39
40 const int update_interval_ = 1500; // ms
41
WirelessFrame(QWidget * parent)42 WirelessFrame::WirelessFrame(QWidget *parent) :
43 QFrame(parent),
44 ui(new Ui::WirelessFrame),
45 interfaces_(NULL),
46 capture_in_progress_(false),
47 iface_timer_id_(-1)
48 {
49 ui->setupUi(this);
50
51 ui->helperToolButton->hide();
52
53 if (ws80211_init() == WS80211_INIT_OK) {
54 ui->stackedWidget->setEnabled(true);
55 ui->stackedWidget->setCurrentWidget(ui->interfacePage);
56
57 #ifdef HAVE_AIRPCAP
58 // We should arguably add ws80211_get_helper_name and ws80211_get_helper_tooltip.
59 // This works for now and is translatable.
60 ui->helperToolButton->setText(tr("AirPcap Control Panel"));
61 ui->helperToolButton->setToolTip(tr("Open the AirPcap Control Panel"));
62 ui->helperToolButton->show();
63 ui->helperToolButton->setEnabled(ws80211_get_helper_path() != NULL);
64 #endif
65
66 } else {
67 ui->stackedWidget->setEnabled(false);
68 ui->stackedWidget->setCurrentWidget(ui->noWirelessPage);
69 }
70
71 ui->fcsFilterFrame->setVisible(ws80211_has_fcs_filter());
72
73 updateInterfaceList();
74 connect(wsApp, &WiresharkApplication::localInterfaceEvent,
75 this, &WirelessFrame::handleInterfaceEvent);
76 }
77
~WirelessFrame()78 WirelessFrame::~WirelessFrame()
79 {
80 ws80211_free_interfaces(interfaces_);
81 delete ui;
82 }
83
setCaptureInProgress(bool capture_in_progress)84 void WirelessFrame::setCaptureInProgress(bool capture_in_progress)
85 {
86 capture_in_progress_ = capture_in_progress;
87 updateWidgets();
88 }
89
90
startTimer(int interval)91 int WirelessFrame::startTimer(int interval)
92 {
93 if (iface_timer_id_ != -1) {
94 killTimer(iface_timer_id_);
95 iface_timer_id_ = -1;
96 }
97 iface_timer_id_ = QFrame::startTimer(interval);
98 return iface_timer_id_;
99 }
100
handleInterfaceEvent(const char * ifname _U_,int added,int up _U_)101 void WirelessFrame::handleInterfaceEvent(const char *ifname _U_, int added, int up _U_)
102 {
103 if (!added) {
104 // Unfortunately when an interface removed event is received the network
105 // interface is still present for a while in the system.
106 // To overcome this update the interface list after a while.
107 startTimer(update_interval_);
108 } else {
109 updateInterfaceList();
110 }
111 }
112
timerEvent(QTimerEvent * event)113 void WirelessFrame::timerEvent(QTimerEvent *event)
114 {
115 if (event->timerId() != iface_timer_id_) {
116 QFrame::timerEvent(event);
117 return;
118 }
119 killTimer(iface_timer_id_);
120 iface_timer_id_ = -1;
121 updateInterfaceList();
122 }
123
124 // Check to see if the ws80211 interface list matches the one in our
125 // combobox. Rebuild ours if necessary and select the first interface if
126 // the current selection goes away.
updateInterfaceList()127 void WirelessFrame::updateInterfaceList()
128 {
129 ws80211_free_interfaces(interfaces_);
130 interfaces_ = ws80211_find_interfaces();
131 const QString old_iface = ui->interfaceComboBox->currentText();
132 guint iface_count = 0;
133 bool list_changed = false;
134
135 // Don't interfere with user activity.
136 if (ui->interfaceComboBox->view()->isVisible()
137 || ui->channelComboBox->view()->isVisible()
138 || ui->channelTypeComboBox->view()->isVisible()
139 || ui->fcsComboBox->view()->isVisible()) {
140 startTimer(update_interval_);
141 return;
142 }
143
144 if (interfaces_ && interfaces_->len > 0) {
145 iface_count = interfaces_->len;
146 }
147
148 if ((int) iface_count != ui->interfaceComboBox->count()) {
149 list_changed = true;
150 } else {
151 for (guint i = 0; i < iface_count; i++) {
152 struct ws80211_interface *iface = g_array_index(interfaces_, struct ws80211_interface *, i);
153 if (ui->interfaceComboBox->itemText(i).compare(iface->ifname) != 0) {
154 list_changed = true;
155 break;
156 }
157 }
158 }
159
160 if (list_changed) {
161 ui->interfaceComboBox->clear();
162 for (guint i = 0; i < iface_count; i++) {
163 struct ws80211_interface *iface = g_array_index(interfaces_, struct ws80211_interface *, i);
164 ui->interfaceComboBox->addItem(iface->ifname);
165 if (old_iface.compare(iface->ifname) == 0) {
166 ui->interfaceComboBox->setCurrentIndex(ui->interfaceComboBox->count() - 1);
167 }
168 }
169 }
170
171 if (ui->interfaceComboBox->currentText().compare(old_iface) != 0) {
172 getInterfaceInfo();
173 }
174 }
175
updateWidgets()176 void WirelessFrame::updateWidgets()
177 {
178 bool enable_interface = false;
179 bool enable_channel = false;
180 bool enable_offset = false;
181 bool enable_show_fcs = false;
182
183 if (ui->interfaceComboBox->count() > 0) {
184 enable_interface = true;
185 enable_show_fcs = true;
186 }
187
188 if (enable_interface && ui->channelComboBox->count() > 0) {
189 enable_channel = true;
190 }
191
192 if (enable_channel && ui->channelTypeComboBox->count() > 1) {
193 enable_offset = true;
194 }
195
196 ui->interfaceComboBox->setEnabled(enable_interface);
197 ui->channelComboBox->setEnabled(enable_channel);
198 ui->channelTypeComboBox->setEnabled(enable_offset);
199 ui->fcsComboBox->setEnabled(!capture_in_progress_ && enable_show_fcs);
200 }
201
on_helperToolButton_clicked()202 void WirelessFrame::on_helperToolButton_clicked()
203 {
204 const QString helper_path = ws80211_get_helper_path();
205 if (helper_path.isEmpty()) return;
206
207 QString command = QString("\"%1\"").arg(helper_path);
208 QProcess::startDetached(command, QStringList());
209 }
210
on_prefsToolButton_clicked()211 void WirelessFrame::on_prefsToolButton_clicked()
212 {
213 emit showWirelessPreferences("wlan");
214 }
215
getInterfaceInfo()216 void WirelessFrame::getInterfaceInfo()
217 {
218 const QString cur_iface = ui->interfaceComboBox->currentText();
219
220 ui->channelComboBox->clear();
221 ui->channelTypeComboBox->clear();
222 ui->fcsComboBox->clear();
223
224 if (cur_iface.isEmpty()) {
225 updateWidgets();
226 return;
227 }
228
229 for (guint i = 0; i < interfaces_->len; i++) {
230 struct ws80211_interface *iface = g_array_index(interfaces_, struct ws80211_interface *, i);
231 if (cur_iface.compare(iface->ifname) == 0) {
232 struct ws80211_iface_info iface_info;
233 QString units = " GHz";
234
235 ws80211_get_iface_info(iface->ifname, &iface_info);
236
237 for (guint j = 0; j < iface->frequencies->len; j++) {
238 guint32 frequency = g_array_index(iface->frequencies, guint32, j);
239 double ghz = frequency / 1000.0;
240 QString chan_str = QString("%1 " UTF8_MIDDLE_DOT " %2%3")
241 .arg(ieee80211_mhz_to_chan(frequency))
242 .arg(ghz, 0, 'f', 3)
243 .arg(units);
244 ui->channelComboBox->addItem(chan_str, frequency);
245 if ((int)frequency == iface_info.current_freq) {
246 ui->channelComboBox->setCurrentIndex(ui->channelComboBox->count() - 1);
247 }
248 units = QString();
249 }
250 // XXX - Do we need to make a distinction between WS80211_CHAN_NO_HT
251 // and WS80211_CHAN_HT20? E.g. is there a driver that won't capture
252 // HT frames if you use WS80211_CHAN_NO_HT?
253 ui->channelTypeComboBox->addItem("20 MHz", WS80211_CHAN_NO_HT);
254 if (iface_info.current_chan_type == WS80211_CHAN_NO_HT || iface_info.current_chan_type == WS80211_CHAN_HT20) {
255 ui->channelTypeComboBox->setCurrentIndex(0);
256 }
257 if (iface->channel_types & (1 << WS80211_CHAN_HT40MINUS)) {
258 ui->channelTypeComboBox->addItem("HT 40-", WS80211_CHAN_HT40MINUS);
259 if (iface_info.current_chan_type == WS80211_CHAN_HT40MINUS) {
260 ui->channelTypeComboBox->setCurrentIndex(ui->channelTypeComboBox->count() - 1);
261 }
262 }
263 if (iface->channel_types & (1 << WS80211_CHAN_HT40PLUS)) {
264 ui->channelTypeComboBox->addItem("HT 40+", WS80211_CHAN_HT40PLUS);
265 if (iface_info.current_chan_type == WS80211_CHAN_HT40PLUS) {
266 ui->channelTypeComboBox->setCurrentIndex(ui->channelTypeComboBox->count() - 1);
267 }
268 }
269 if (iface->channel_types & (1 << WS80211_CHAN_VHT80)) {
270 ui->channelTypeComboBox->addItem("VHT 80", WS80211_CHAN_VHT80);
271 if (iface_info.current_chan_type == WS80211_CHAN_VHT80) {
272 ui->channelTypeComboBox->setCurrentIndex(ui->channelTypeComboBox->count() - 1);
273 }
274 }
275 if (iface->channel_types & (1 << WS80211_CHAN_VHT160)) {
276 ui->channelTypeComboBox->addItem("VHT 160", WS80211_CHAN_VHT160);
277 if (iface_info.current_chan_type == WS80211_CHAN_VHT160) {
278 ui->channelTypeComboBox->setCurrentIndex(ui->channelTypeComboBox->count() - 1);
279 }
280 }
281
282 if (ws80211_has_fcs_filter()) {
283 ui->fcsComboBox->setCurrentIndex(iface_info.current_fcs_validation);
284 }
285 }
286 }
287
288 updateWidgets();
289 }
290
setInterfaceInfo()291 void WirelessFrame::setInterfaceInfo()
292 {
293 QString cur_iface = ui->interfaceComboBox->currentText();
294 int cur_chan_idx = ui->channelComboBox->currentIndex();
295 int cur_type_idx = ui->channelTypeComboBox->currentIndex();
296 int cur_fcs_idx = ui->fcsComboBox->currentIndex();
297
298 if (cur_iface.isEmpty() || cur_chan_idx < 0 || cur_type_idx < 0) return;
299
300 QString err_str;
301
302 #if defined(HAVE_LIBNL) && defined(HAVE_NL80211) && defined(HAVE_LIBPCAP)
303 int frequency = ui->channelComboBox->itemData(cur_chan_idx).toInt();
304 int chan_type = ui->channelTypeComboBox->itemData(cur_type_idx).toInt();
305 int bandwidth = getBandwidthFromChanType(chan_type);
306 int center_freq = getCenterFrequency(frequency, bandwidth);
307 const gchar *chan_type_s = ws80211_chan_type_to_str(chan_type);
308 gchar *center_freq_s = NULL;
309 gchar *data, *primary_msg, *secondary_msg;
310 int ret;
311
312 if (frequency < 0 || chan_type < 0) return;
313
314 if (center_freq != -1) {
315 center_freq_s = g_strdup(QString::number(center_freq).toUtf8().constData());
316 }
317
318 ret = sync_interface_set_80211_chan(cur_iface.toUtf8().constData(),
319 QString::number(frequency).toUtf8().constData(), chan_type_s,
320 center_freq_s, NULL,
321 &data, &primary_msg, &secondary_msg, main_window_update);
322
323 g_free(center_freq_s);
324 g_free(data);
325 g_free(primary_msg);
326 g_free(secondary_msg);
327
328 /* Parse the error msg */
329 if (ret) {
330 err_str = tr("Unable to set channel or offset.");
331 }
332 #elif defined(HAVE_AIRPCAP)
333 int frequency = ui->channelComboBox->itemData(cur_chan_idx).toInt();
334 int chan_type = ui->channelTypeComboBox->itemData(cur_type_idx).toInt();
335 if (frequency < 0 || chan_type < 0) return;
336
337 if (ws80211_set_freq(cur_iface.toUtf8().constData(), frequency, chan_type, -1, -1) != 0) {
338 err_str = tr("Unable to set channel or offset.");
339 }
340 #endif
341
342 if (cur_fcs_idx >= 0) {
343 if (ws80211_set_fcs_validation(cur_iface.toUtf8().constData(), (enum ws80211_fcs_validation) cur_fcs_idx) != 0) {
344 err_str = tr("Unable to set FCS validation behavior.");
345 }
346 }
347
348 if (!err_str.isEmpty()) {
349 wsApp->pushStatus(WiresharkApplication::TemporaryStatus, err_str);
350 }
351
352 getInterfaceInfo();
353 }
354
getCenterFrequency(int control_frequency,int bandwidth)355 int WirelessFrame::getCenterFrequency(int control_frequency, int bandwidth)
356 {
357 if (bandwidth < 80 || control_frequency < 5180)
358 return -1;
359
360 return ((control_frequency - 5180) / bandwidth) * bandwidth + 5180 + (bandwidth / 2) - 10;
361 }
362
getBandwidthFromChanType(int chan_type)363 int WirelessFrame::getBandwidthFromChanType(int chan_type)
364 {
365 switch (chan_type) {
366 case WS80211_CHAN_VHT80:
367 return 80;
368 case WS80211_CHAN_VHT160:
369 return 160;
370 default:
371 return -1;
372 }
373 }
374
on_interfaceComboBox_activated(int)375 void WirelessFrame::on_interfaceComboBox_activated(int)
376 {
377 getInterfaceInfo();
378 }
379
on_channelComboBox_activated(int)380 void WirelessFrame::on_channelComboBox_activated(int)
381 {
382 setInterfaceInfo();
383 }
384
on_channelTypeComboBox_activated(int)385 void WirelessFrame::on_channelTypeComboBox_activated(int)
386 {
387 setInterfaceInfo();
388 }
389
on_fcsComboBox_activated(int)390 void WirelessFrame::on_fcsComboBox_activated(int)
391 {
392 setInterfaceInfo();
393 }
394