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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/. */
// Developed by J.R. Oldroyd <fbsd@opal.com>, December 2012.
// For FreeBSD we use the getifaddrs(3) to obtain the list of interfaces
// and then check for those with an 802.11 media type and able to return
// a list of stations. This is similar to ifconfig(8).
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#ifdef __DragonFly__
# include <netproto/802_11/ieee80211_ioctl.h>
#else
# include <net80211/ieee80211_ioctl.h>
#endif
#include <ifaddrs.h>
#include <string.h>
#include <unistd.h>
#include "nsWifiAccessPoint.h"
using namespace mozilla;
static nsresult FreeBSDGetAccessPointData(
nsCOMArray<nsWifiAccessPoint>& accessPoints) {
// get list of interfaces
struct ifaddrs* ifal;
if (getifaddrs(&ifal) < 0) {
return NS_ERROR_FAILURE;
}
accessPoints.Clear();
// loop through the interfaces
nsresult rv = NS_ERROR_FAILURE;
struct ifaddrs* ifa;
for (ifa = ifal; ifa; ifa = ifa->ifa_next) {
// limit to one interface per address
if (ifa->ifa_addr->sa_family != AF_LINK) {
continue;
}
// store interface name in socket structure
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
ifr.ifr_addr.sa_family = AF_LOCAL;
// open socket to interface
int s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0);
if (s < 0) {
continue;
}
// clear interface media structure
struct ifmediareq ifmr;
memset(&ifmr, 0, sizeof(ifmr));
strncpy(ifmr.ifm_name, ifa->ifa_name, sizeof(ifmr.ifm_name));
// get interface media information
if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
close(s);
continue;
}
// check interface is a WiFi interface
if (IFM_TYPE(ifmr.ifm_active) != IFM_IEEE80211) {
close(s);
continue;
}
// perform WiFi scan
struct ieee80211req i802r;
char iscanbuf[32 * 1024];
memset(&i802r, 0, sizeof(i802r));
strncpy(i802r.i_name, ifa->ifa_name, sizeof(i802r.i_name));
i802r.i_type = IEEE80211_IOC_SCAN_RESULTS;
i802r.i_data = iscanbuf;
i802r.i_len = sizeof(iscanbuf);
if (ioctl(s, SIOCG80211, &i802r) < 0) {
close(s);
continue;
}
// close socket
close(s);
// loop through WiFi networks and build geoloc-lookup structure
char* vsr = (char*)i802r.i_data;
unsigned len = i802r.i_len;
while (len >= sizeof(struct ieee80211req_scan_result)) {
struct ieee80211req_scan_result* isr =
(struct ieee80211req_scan_result*)vsr;
// determine size of this entry
char* id;
int idlen;
if (isr->isr_meshid_len) {
id = vsr + isr->isr_ie_off + isr->isr_ssid_len;
idlen = isr->isr_meshid_len;
} else {
id = vsr + isr->isr_ie_off;
idlen = isr->isr_ssid_len;
}
// copy network data
char ssid[IEEE80211_NWID_LEN + 1];
strncpy(ssid, id, idlen);
ssid[idlen] = '\0';
nsWifiAccessPoint* ap = new nsWifiAccessPoint();
ap->setSSID(ssid, strlen(ssid));
ap->setMac(isr->isr_bssid);
ap->setSignal(isr->isr_rssi);
accessPoints.AppendObject(ap);
rv = NS_OK;
// log the data
LOG(
("FreeBSD access point: "
"SSID: %s, MAC: %02x-%02x-%02x-%02x-%02x-%02x, "
"Strength: %d, Channel: %dMHz\n",
ssid, isr->isr_bssid[0], isr->isr_bssid[1], isr->isr_bssid[2],
isr->isr_bssid[3], isr->isr_bssid[4], isr->isr_bssid[5],
isr->isr_rssi, isr->isr_freq));
// increment pointers
len -= isr->isr_len;
vsr += isr->isr_len;
}
}
freeifaddrs(ifal);
return rv;
}
nsresult nsWifiMonitor::DoScan() {
// Regularly get the access point data.
nsCOMArray<nsWifiAccessPoint> lastAccessPoints;
nsCOMArray<nsWifiAccessPoint> accessPoints;
do {
nsresult rv = FreeBSDGetAccessPointData(accessPoints);
if (NS_FAILED(rv)) return rv;
bool accessPointsChanged =
!AccessPointsEqual(accessPoints, lastAccessPoints);
ReplaceArray(lastAccessPoints, accessPoints);
rv = CallWifiListeners(lastAccessPoints, accessPointsChanged);
NS_ENSURE_SUCCESS(rv, rv);
// wait for some reasonable amount of time. pref?
LOG(("waiting on monitor\n"));
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
mon.Wait(PR_SecondsToInterval(kDefaultWifiScanInterval));
} while (mKeepGoing);
return NS_OK;
}
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