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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsWifiMonitor.h"
#include "nsWifiAccessPoint.h"
#include "nsServiceManagerUtils.h"
#include "nsComponentManagerUtils.h"
#include <glib.h>
#define DLADM_STRSIZE 256
#define DLADM_SECTIONS 3
using namespace mozilla;
struct val_strength_t {
const char* strength_name;
int signal_value;
};
static val_strength_t strength_vals[] = {{"very weak", -112},
{"weak", -88},
{"good", -68},
{"very good", -40},
{"excellent", -16}};
static nsWifiAccessPoint* do_parse_str(char* bssid_str, char* essid_str,
char* strength) {
unsigned char mac_as_int[6] = {0};
sscanf(bssid_str, "%x:%x:%x:%x:%x:%x", &mac_as_int[0], &mac_as_int[1],
&mac_as_int[2], &mac_as_int[3], &mac_as_int[4], &mac_as_int[5]);
int signal = 0;
uint32_t strength_vals_count = sizeof(strength_vals) / sizeof(val_strength_t);
for (uint32_t i = 0; i < strength_vals_count; i++) {
if (!strncasecmp(strength, strength_vals[i].strength_name, DLADM_STRSIZE)) {
signal = strength_vals[i].signal_value;
break;
}
}
nsWifiAccessPoint* ap = new nsWifiAccessPoint();
if (ap) {
ap->setMac(mac_as_int);
ap->setSignal(signal);
size_t len = essid_str ? strnlen(essid_str, DLADM_STRSIZE) : 0;
ap->setSSID(essid_str, len);
}
return ap;
}
static void do_dladm(nsCOMArray<nsWifiAccessPoint>& accessPoints) {
GError* err = nullptr;
char* sout = nullptr;
char* serr = nullptr;
int exit_status = 0;
char* dladm_args[] = {
"/usr/bin/pfexec", "/usr/sbin/dladm", "scan-wifi", "-p", "-o",
"BSSID,ESSID,STRENGTH"};
gboolean rv = g_spawn_sync("/", dladm_args, nullptr, (GSpawnFlags)0, nullptr,
nullptr, &sout, &serr, &exit_status, &err);
if (rv && !exit_status) {
char wlan[DLADM_SECTIONS][DLADM_STRSIZE + 1];
uint32_t section = 0;
uint32_t sout_scan = 0;
uint32_t wlan_put = 0;
bool escape = false;
nsWifiAccessPoint* ap;
char sout_char;
do {
sout_char = sout[sout_scan++];
if (escape) {
escape = false;
if (sout_char != '\0') {
wlan[section][wlan_put++] = sout_char;
continue;
}
}
if (sout_char == '\\') {
escape = true;
continue;
}
if (sout_char == ':') {
wlan[section][wlan_put] = '\0';
section++;
wlan_put = 0;
continue;
}
if ((sout_char == '\0') || (sout_char == '\n')) {
wlan[section][wlan_put] = '\0';
if (section == DLADM_SECTIONS - 1) {
ap = do_parse_str(wlan[0], wlan[1], wlan[2]);
if (ap) {
accessPoints.AppendObject(ap);
}
}
section = 0;
wlan_put = 0;
continue;
}
wlan[section][wlan_put++] = sout_char;
} while ((wlan_put <= DLADM_STRSIZE) && (section < DLADM_SECTIONS) &&
(sout_char != '\0'));
}
g_free(sout);
g_free(serr);
}
nsresult nsWifiMonitor::DoScan() {
// Regularly get the access point data.
nsCOMArray<nsWifiAccessPoint> lastAccessPoints;
nsCOMArray<nsWifiAccessPoint> accessPoints;
while (mKeepGoing) {
accessPoints.Clear();
do_dladm(accessPoints);
bool accessPointsChanged =
!AccessPointsEqual(accessPoints, lastAccessPoints);
ReplaceArray(lastAccessPoints, accessPoints);
nsresult rv = CallWifiListeners(lastAccessPoints, accessPointsChanged);
NS_ENSURE_SUCCESS(rv, rv);
LOG(("waiting on monitor\n"));
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
mon.Wait(PR_SecondsToInterval(kDefaultWifiScanInterval));
}
return NS_OK;
}