Task 2 should be finished

lab_3/task2.m

@@ -10,17 +10,52 @@ beaconFrames2 = extractBeaconFrames(rxFrame2);
 beaconFrames3 = extractBeaconFrames(rxFrame3);
 beaconFrames4 = extractBeaconFrames(rxFrame4);
 
-cfgMAC = beaconFrames1(1).MAC_Config;
-mgmt = cfgMAC.ManagementConfig;
-
-disp(mgmt)
-properties(mgmt)
-
+% 1.
+disp("Beacon Frame 1")
 printBeaconTable(beaconFrames1);
+disp("Beacon Frame 2")
 printBeaconTable(beaconFrames2);
+disp("Beacon Frame 3")
 printBeaconTable(beaconFrames3);
+disp("Beacon Frame 4")
 printBeaconTable(beaconFrames4);
 
+% 2.
+%{
+Address 1: used to announce the destination station, in a beacon frame its 
+           FF:FF:FF:FF:FF:FF (meaning broadcast to all stations)
+Address 2: used to remark the source device address of the frame, 
+           the ap mac who sent the beacon is inserted
+Address 3: used for the bssid of the device sending the beacon, means
+           usually address 2 equals address 3, when no virtual ap is used
+Address 4: this field does not exists, after the seq ctrl the frame body
+           follows containing beacon data instead of an address, like
+           timestamp, beacon interval, capability info, ssid, potentially
+           the channel number, see the extracts from 2.1
+%}
+
+% 3.
+%{
+Downlink: AP -> Station
+Address 1: MAC of the destination station
+Address 2: MAC of the AP which transmits the frame
+Address 3: MAC of the initial sender which has started the frame
+Address 4: not used
+
+Uplink: Station -> AP
+Address 1: MAC of the AP that receives and potentially forwards the frame
+Address 2: MAC of the sending station
+Address 3: MAC of the final destination station
+Address 4: not used
+
+4 Address case: wireless bridge:
+Address 1: MAC of the AP that should receive / transmit through the frame, 
+           for example AP, bridge node, repeater or mesh node
+Address 2: MAC of the transmitter (into the other network)
+Address 3: MAC of the final destination
+Address 4: MAC of the initial sender
+%}
+
 function beaconFrames = extractBeaconFrames(rxFrame)
     beaconFrames = struct( ...
                            "SSID", {}, ...
@@ -31,8 +66,6 @@ function beaconFrames = extractBeaconFrames(rxFrame)
                            "SNR_dB", {} ...
                          );
 
-    channel_bandwidth = "CBW20"; % 20MHz
-
     searchOffset = 0;
     index = 1;
 
@@ -80,25 +113,129 @@ function beaconFrames = extractBeaconFrames(rxFrame)
 end
 
 function printBeaconTable(beaconFrames)
+    beaconCount = numel(beaconFrames);
+
+    tableFormat = "%-20s %-18s %-10s %-8s %-8s %-8s %-12s %-8s %-80s\n";
+
+    if(beaconCount < 1)
+        disp("No valid beacons could be extracted")
+        return;
+    end
+
     fprintf("\n");
-    fprintf("%-20s %-18s %-10s %-8s %-8s %-8s %-12s %-8s %-20s\n", ...
+    fprintf(tableFormat, ...
         "SSID", "BSSID", "Interval", "B. ch.", "Op. ch.", "SNR", "Vendor", "Std.", "Rates");
-    
-    for i = 1:numel(beaconFrames)
+
+    for i = 1 : beaconCount
+        mgmt = beaconFrames(i).MAC_Config.ManagementConfig;
+
         ssid = string(beaconFrames(i).SSID);
-        bssid = string(beaconFrames(i).BSSID);
-        interval = string(beaconFrames(i).MAC_Config.ManagementConfig.BeaconInterval);
+        bssid = toMACAddress(beaconFrames(i).BSSID);
+        interval = string(mgmt.BeaconInterval);
         snr = sprintf("%.1f", beaconFrames(i).SNR_dB);
     
-        bch = "-";
-        opch = "-";
-        vendor = "-";
-        std = "-";
-        rates = "-";
+        [bch, opch] = extractChannels(mgmt);
+        vendor = lookupVendor(beaconFrames(i).BSSID);
+        rates = getRates(mgmt);
+        std = getWifiStandard(mgmt);
     
-        fprintf("%-20s %-18s %-10s %-8s %-8s %-8s %-12s %-8s %-20s\n", ...
+        fprintf(tableFormat, ...
             ssid, bssid, interval, bch, opch, snr, vendor, std, rates);
     end
     
     fprintf("\n");
+end
+
+function mac = toMACAddress(mac)
+    mac = upper(string(mac));
+    
+    if strlength(mac) ~= 12
+        return;
+    end
+    
+    macChars = char(mac);
+
+    mac = string(sprintf("%s:%s:%s:%s:%s:%s", ...
+        macChars(1:2), ...
+        macChars(3:4), ...
+        macChars(5:6), ...
+        macChars(7:8), ...
+        macChars(9:10), ...
+        macChars(11:12)));
+end
+
+function rates = getRates(mgmt)
+    basicRates = string(mgmt.BasicRates);
+    additionalRates = string(mgmt.AdditionalRates);
+    
+    if isempty(basicRates) && isempty(additionalRates)
+        rates = "-";
+        return;
+    end
+    
+    basicRates = "[" + strjoin(basicRates, ", ") + "]";    
+    rates = strjoin([basicRates, additionalRates], ", ");
+end
+
+function vendor = lookupVendor(bssid)
+    bssid = upper(string(bssid));
+    
+    if strlength(bssid) < 6
+        vendor = "-";
+        return;
+    end
+    
+    oui = extractBefore(bssid, 7);
+    
+    switch oui
+        case { "C884A1", "5CE176" }
+            vendor = "Cisco";
+        case { "6466B3", "647002" }
+            vendor = "TP-Link";
+        otherwise
+            vendor = "Unknown";
+    end
+end
+
+function std = getWifiStandard(mgmt)
+    rates = [string(mgmt.BasicRates), string(mgmt.AdditionalRates)];
+    
+    if any(contains(rates, ["6 Mbps", "9 Mbps", "12 Mbps", "18 Mbps", "24 Mbps", "36 Mbps", "48 Mbps", "54 Mbps"]))
+        std = "802.11g";
+    elseif any(contains(rates, ["1 Mbps", "2 Mbps", "5.5 Mbps", "11 Mbps"]))
+        std = "802.11b";
+    else
+        std = "Unknown";
+    end
+end
+
+function [b_ch, op_ch] = extractChannels(mgmt)
+    b_ch = "-";
+    op_ch = "-";
+
+    ies = mgmt.InformationElements;
+
+    if(isempty(ies)) 
+        return; 
+    end
+
+    for i = 1 : size(ies, 1)
+        id = ies{i, 1};
+        value = ies{i, 2};
+
+        if isempty(id) || isempty(value)
+            continue;
+        end
+
+        switch id(1)
+            case 3
+                b_ch = string(double(value(1)));
+            case 61
+                op_ch = string(double(value(1)));
+        end
+
+        if ~strcmp(b_ch, "-") && ~strcmp(op_ch, "-")
+            return;
+        end
+    end
 end