Task 2 should be finished
This commit is contained in:
ti_mo
+219
-8
@@ -1,18 +1,81 @@
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channel_bandwidth = "CBW20"; % 20MHz
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addpath("from_matlab_example");
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rxFrame1 = trace1.iq(:);
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rxFrame2 = trace2.iq(:);
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rxFrame3 = trace3.iq(:);
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rxFrame4 = trace4.iq(:);
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function beaconFrames = extractBeaconFrames(rxFrame)
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beaconFrames = [];
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searchOffset = 0;
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beaconFrames1 = extractBeaconFrames(rxFrame1);
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beaconFrames2 = extractBeaconFrames(rxFrame2);
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beaconFrames3 = extractBeaconFrames(rxFrame3);
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beaconFrames4 = extractBeaconFrames(rxFrame4);
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% 1.
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disp("Beacon Frame 1")
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printBeaconTable(beaconFrames1);
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disp("Beacon Frame 2")
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printBeaconTable(beaconFrames2);
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disp("Beacon Frame 3")
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printBeaconTable(beaconFrames3);
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disp("Beacon Frame 4")
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printBeaconTable(beaconFrames4);
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% 2.
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%{
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Address 1: used to announce the destination station, in a beacon frame its
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FF:FF:FF:FF:FF:FF (meaning broadcast to all stations)
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Address 2: used to remark the source device address of the frame,
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the ap mac who sent the beacon is inserted
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Address 3: used for the bssid of the device sending the beacon, means
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usually address 2 equals address 3, when no virtual ap is used
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Address 4: this field does not exists, after the seq ctrl the frame body
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follows containing beacon data instead of an address, like
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timestamp, beacon interval, capability info, ssid, potentially
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the channel number, see the extracts from 2.1
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%}
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% 3.
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%{
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Downlink:
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Address 1: MAC of the destination station
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Address 2: MAC of the AP which further routes the frame
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Address 3: MAC of the initial sender which has started the process of
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the frame to AP's
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Address 4: not used
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Uplink:
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Address 1: MAC of the AP the WiFi frame should route through
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(the connected AP)
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Address 2: MAC of the sending station
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Address 3: used to store the final destination MAC address
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Address 4: not used
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4 Address case:
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Address 4: is only used in wireless bridge solutions, environments where
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multiple AP's connect different LAN's to one big one
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%}
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function beaconFrames = extractBeaconFrames(rxFrame)
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beaconFrames = struct( ...
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"SSID", {}, ...
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"BSSID", {}, ...
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"Offset", {}, ...
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"MAC_Config", {}, ...
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"Bits", {}, ...
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"SNR_dB", {} ...
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);
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searchOffset = 0;
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index = 1;
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while searchOffset < length(rxFrame)
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oldOffset = searchOffset;
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[bitsData, decParams, searchOffset, res] = recoverOFDMBits(rxFrame, searchOffset);
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if searchOffset <= oldOffset
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searchOffset = oldOffset + 1;
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end
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if isempty(bitsData)
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continue;
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end
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@@ -20,10 +83,158 @@ function beaconFrames = extractBeaconFrames(rxFrame)
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[cfgMAC, ~, decodeStatus] = wlanMPDUDecode(bitsData, SuppressWarnings=true);
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if ~decodeStatus && matches(cfgMAC.FrameType, "Beacon")
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disp("Beacon at " + searchOffset);
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beaconFrames(end + 1) = cfgMAC;
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if isempty(cfgMAC.ManagementConfig.SSID)
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ssid = "Hidden";
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else
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ssid = string(cfgMAC.ManagementConfig.SSID);
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end
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if isfield(res, "PacketOffset")
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beaconFrames(index).Offset = res.PacketOffset;
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else
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beaconFrames(index).Offset = oldOffset;
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end
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if isfield(res, "LLTFSNR")
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beaconFrames(index).SNR_dB = res.LLTFSNR;
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else
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beaconFrames(index).SNR_dB = NaN;
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end
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beaconFrames(index).SSID = ssid;
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beaconFrames(index).BSSID = string(cfgMAC.Address3);
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beaconFrames(index).MAC_Config = cfgMAC;
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beaconFrames(index).Bits = bitsData;
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index = index + 1;
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end
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end
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end
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beaconFrames1 = extractBeaconFrames(rxFrame1);
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function printBeaconTable(beaconFrames)
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beaconCount = numel(beaconFrames);
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tableFormat = "%-20s %-18s %-10s %-8s %-8s %-8s %-12s %-8s %-80s\n";
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if(beaconCount < 1)
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disp("No valid beacons could be extracted")
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return;
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end
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fprintf("\n");
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fprintf(tableFormat, ...
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"SSID", "BSSID", "Interval", "B. ch.", "Op. ch.", "SNR", "Vendor", "Std.", "Rates");
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for i = 1 : beaconCount
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mgmt = beaconFrames(i).MAC_Config.ManagementConfig;
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ssid = string(beaconFrames(i).SSID);
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bssid = toMACAddress(beaconFrames(i).BSSID);
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interval = string(mgmt.BeaconInterval);
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snr = sprintf("%.1f", beaconFrames(i).SNR_dB);
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[bch, opch] = extractChannels(mgmt);
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vendor = lookupVendor(beaconFrames(i).BSSID);
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rates = getRates(mgmt);
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std = getWifiStandard(mgmt);
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fprintf(tableFormat, ...
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ssid, bssid, interval, bch, opch, snr, vendor, std, rates);
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end
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fprintf("\n");
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end
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function mac = toMACAddress(mac)
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mac = upper(string(mac));
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if strlength(mac) ~= 12
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return;
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end
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macChars = char(mac);
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mac = string(sprintf("%s:%s:%s:%s:%s:%s", ...
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macChars(1:2), ...
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macChars(3:4), ...
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macChars(5:6), ...
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macChars(7:8), ...
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macChars(9:10), ...
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macChars(11:12)));
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end
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function rates = getRates(mgmt)
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basicRates = string(mgmt.BasicRates);
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additionalRates = string(mgmt.AdditionalRates);
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if isempty(basicRates) && isempty(additionalRates)
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rates = "-";
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return;
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end
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basicRates = "[" + strjoin(basicRates, ", ") + "]";
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rates = strjoin([basicRates, additionalRates], ", ");
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end
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function vendor = lookupVendor(bssid)
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bssid = upper(string(bssid));
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if strlength(bssid) < 6
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vendor = "-";
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return;
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end
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oui = extractBefore(bssid, 7);
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switch oui
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case { "C884A1", "5CE176" }
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vendor = "Cisco";
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case { "6466B3", "647002" }
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vendor = "TP-Link";
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otherwise
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vendor = "Unknown";
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end
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end
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function std = getWifiStandard(mgmt)
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rates = [string(mgmt.BasicRates), string(mgmt.AdditionalRates)];
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if any(contains(rates, ["6 Mbps", "9 Mbps", "12 Mbps", "18 Mbps", "24 Mbps", "36 Mbps", "48 Mbps", "54 Mbps"]))
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std = "802.11g";
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elseif any(contains(rates, ["1 Mbps", "2 Mbps", "5.5 Mbps", "11 Mbps"]))
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std = "802.11b";
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else
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std = "Unknown";
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end
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end
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function [b_ch, op_ch] = extractChannels(mgmt)
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b_ch = "-";
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op_ch = "-";
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ies = mgmt.InformationElements;
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if(isempty(ies))
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return;
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end
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for i = 1 : size(ies, 1)
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id = ies{i, 1};
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value = ies{i, 2};
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if isempty(id) || isempty(value)
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continue;
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end
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switch id(1)
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case 3
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b_ch = string(double(value(1)));
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case 61
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op_ch = string(double(value(1)));
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end
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if ~strcmp(b_ch, "-") && ~strcmp(op_ch, "-")
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return;
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end
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end
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end
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