wifiscan 0.4.0

Wireless network scanner TUI with monitor mode, handshake capture, deauth, and evil twin
Documentation 
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use std::collections::HashMap;
use std::sync::OnceLock;

static OUI_DB: OnceLock<HashMap<String, String>> = OnceLock::new();

/// Try to load OUI data from common system paths, then fall back to embedded DB.
pub fn init_oui() {
    OUI_DB.get_or_init(|| {
        // Try system OUI files first (from ieee-data package or manual download)
        let system_paths = [
            "/usr/share/ieee-data/oui.csv",
            "/usr/share/hwdata/oui.txt",
            "/usr/share/misc/oui.txt",
            "/var/lib/ieee-data/oui.csv",
            "/etc/oui.txt",
            "./oui.txt",
        ];

        for path in &system_paths {
            if let Ok(contents) = std::fs::read_to_string(path) {
                let db = parse_oui_file(&contents, path);
                if db.len() > 100 {
                    eprintln!("[+] Loaded {} OUI entries from {}", db.len(), path);
                    return db;
                }
            }
        }

        // Fall back to embedded database
        eprintln!("[*] No system OUI file found. Using built-in database (~500 vendors).");
        eprintln!("    For full coverage: sudo apt install ieee-data");
        eprintln!("    Or: curl -sL https://standards-oui.ieee.org/oui/oui.txt > ./oui.txt");
        build_embedded_db()
    });
}

/// Parse various OUI file formats (IEEE oui.txt, oui.csv, hwdata)
fn parse_oui_file(contents: &str, path: &str) -> HashMap<String, String> {
    let mut db = HashMap::new();

    if path.ends_with(".csv") {
        // CSV format: MA-L,OUI_PREFIX,Organization Name,...
        for line in contents.lines().skip(1) {
            let fields: Vec<&str> = line.splitn(4, ',').collect();
            if fields.len() >= 3 {
                let prefix = fields[1].trim().replace(['-', '"'], "").to_uppercase();
                let name = fields[2].trim().replace('"', "");
                if prefix.len() == 6 && !name.is_empty() {
                    db.insert(prefix, shorten_vendor(&name));
                }
            }
        }
    } else {
        // IEEE oui.txt format: "XX-XX-XX   (hex)\t\tVendor Name"
        // or hwdata format: "XXXXXX VendorName"
        for line in contents.lines() {
            let trimmed = line.trim();

            // IEEE format: "00-00-00   (hex)\t\tXerox Corporation"
            if trimmed.contains("(hex)") {
                let parts: Vec<&str> = trimmed.splitn(2, "(hex)").collect();
                if parts.len() == 2 {
                    let prefix = parts[0].trim().replace('-', "").to_uppercase();
                    let name = parts[1].trim();
                    if prefix.len() >= 6 && !name.is_empty() {
                        db.insert(prefix[..6].to_string(), shorten_vendor(name));
                    }
                }
            }
            // hwdata format: "001122 Vendor Name"
            else if trimmed.len() > 7 && trimmed.as_bytes()[6] == b' ' {
                let prefix = &trimmed[..6];
                if prefix.chars().all(|c| c.is_ascii_hexdigit()) {
                    let name = trimmed[7..].trim();
                    if !name.is_empty() {
                        db.insert(prefix.to_uppercase(), shorten_vendor(name));
                    }
                }
            }
        }
    }
    db
}

/// Shorten long vendor names to fit the TUI. Keep it readable.
fn shorten_vendor(name: &str) -> String {
    // Common substitutions
    let s = name
        .replace("Corporation", "Corp")
        .replace("Incorporated", "Inc")
        .replace("Technologies", "Tech")
        .replace("Technology", "Tech")
        .replace("Electronics", "Elec")
        .replace("Communications", "Comm")
        .replace("International", "Intl")
        .replace("Semiconductor", "Semi")
        .replace("Industries", "Ind")
        .replace(" Co., Ltd.", "")
        .replace(" Co.,Ltd.", "")
        .replace(" Co., Ltd", "")
        .replace(" Ltd.", "")
        .replace(" Ltd", "")
        .replace(" LLC", "")
        .replace(" L.L.C.", "")
        .replace(", Inc.", "")
        .replace(", Inc", "")
        .replace(" Inc.", "")
        .replace(" Inc", "")
        .replace(" GmbH", "")
        .replace(" AG", "")
        .replace(" S.A.", "")
        .replace(" B.V.", "")
        .replace(" Pty", "")
        .replace(" S.r.l.", "")
        .replace(" Corp.", "")
        .replace(" Corp", "");

    let s = s.trim().to_string();

    // Truncate if still long
    if s.len() > 20 {
        let truncated: String = s.chars().take(17).collect();
        format!("{}...", truncated)
    } else {
        s
    }
}

/// Embedded fallback DB covering the most common wireless vendors.
/// Much larger than original - covers router, client, and IoT manufacturers.
fn build_embedded_db() -> HashMap<String, String> {
    let mut m: HashMap<String, String> = HashMap::new();

    let entries: &[(&[&str], &str)] = &[
        // Apple
        (&["00A040","000A27","000A95","000D93","0010FA","001124","001451","0016CB",
           "0017F2","0019E3","001B63","001CB3","001D4F","001E52","001F5B","001FF3",
           "002241","002312","002332","002436","002500","00264A","0026B0","0026BB",
           "003065","003EE1","0050E4","006171","00B362","00C610","00CDFE","00F4B9",
           "00F76F","041552","04489A","044BED","04D3CF","04E536","04F13E","04F7E4",
           "080007","0C4DE9","0CD746","0CF0A4","10417F","109ADD","10DDB1","140004",
           "14109F","1499E2","149A10","18AF61","18AF8F","18E7F4","1C1AC0","1C36BB",
           "1C5CF2","1C9148","1CABA7","20768F","209BCD","244B03","24A074","24A2E1",
           "24F094","28A02B","28CFE9","28E14C","28E7CF","2C200B","2C3361","2CB43A",
           "2CF0A2","2CF0EE","30636B","3090AB","30F7C5","341298","34159E","34C059",
           "3C0754","3C15C2","3C2EF9","3CAB8E","3CD0F8","40331A","4030B9","403CFC",
           "40A6D9","40B395","40D3AE","440010","44D884","48437C","48A195","48D705",
           "4C3275","4C57CA","4C74BF","4C8093","50EAD6","54724F","549F13","54AE27",
           "54E43A","581FAA","5855CA","58B035","5C5948","5C8D4E","5C969D","5CADCF",
           "5CF5DA","5CF7E6","60C547","60D9C7","60F445","60FACD","60FEC5","643803",
           "6476BA","68644B","68967B","689C70","68A86D","68DBCA","68FEF7","6C19C0",
           "6C3E6D","6C40C6","6C4008","6C72E7","6C94F8","6C96CF","6CC26B","700DBC",
           "7014A6","7831C1","78886D","78CA39","7CD1C3","80929F","843835","84FCE6",
           "88E87F","8C8590","9027E4","903C92","9088A2","9C20E6","A0999B","A4D1D2",
           "A860B6","AC3C0B","ACFDEC","B0481A","B4F0AB","B8098A","B8C111","BC3BAF",
           "BC5436","C06394","C0847A","C0B658","C0CECD","C0D012","C4B301","C82A14",
           "C86F1D","CC2DB7","CC4463","D023DB","D04F7E","D0817A","D4619D","D89695",
           "DC2B2A","DC415F","DCA4CA","E0338E","E0B9BA","E4C63D","E4E0A6","E80688",
           "E8802E","EC3586","F0B479","F0DBE2","F40F24","F4F15A","F82793","FC253F"], "Apple"),
        // Samsung
        (&["000726","0007AB","000BAC","000D6B","000FDE","001247","001377","001599",
           "0016DB","0016EB","001856","00197D","001A8A","001B98","001EAE","001EE1",
           "001FCC","001FCD","002119","002339","002399","002454","002567","00265D",
           "5CA6E6","6C2F2C","84119E","8C7715","9463D1","98524A","A8B86E","AC5F3E",
           "B0DF3A","B8D7AF","C44619","CC079F","E4F042","E8508B","F0253C","F40E11",
           "F8042E","F895C7","FCAA14","1C5A3E","342D0D","3810D5","4844F7","507226",
           "600292","6C83FF","BC4760","C0BDD1","D0DFC7","C8B5B7","9C650E","C45006",
           "10D38A","E440E2","54FB58","78D6F0","802BF9","3C8BFE","78ABBB","6C5C14",
           "DC6672","283084","A007B6","4CE676","ACE4B5","285F2F","64B310","B83765",
           "E09971","10D542","00F46F","E8614F"], "Samsung"),
        // Intel
        (&["001111","001302","001500","0013CE","001517","001DE0","001E64","001E65",
           "001F3C","002214","003067","0040C7","007A95","008C54","00A0C9","00D0B7",
           "100BA9","18563A","18FFF0","1CBFCE","244B81","34028E","34E6AD","3C6AA7",
           "484520","4C3488","4CEB42","502B73","58A839","5C5F67","609620","6036DD",
           "641CB0","6C294D","6C88A1","7C2A31","7C5CF8","7CD95C","803773","80C5F2",
           "8468C8","84EF18","88B111","8CA982","9826B6","9C4E36","9CEBEA","A02BB8",
           "A0C589","A4348B","A44CC8","A4C494","AC7289","B4D5BD","BC7737","C8348E",
           "D0C6B3","D4258B","D46D6D","D48564","E00C7F","E0D55E","E44790","E8D8D1",
           "F48C50","F4D108","F8633F","F8942E","F8F1B6","48A472","046C59","7C7A91",
           "401C83","387B47","94659C","0C7A15","3CF862","A09347"], "Intel"),
        // Qualcomm / Atheros
        (&["001374","001A6B","001D0F","00037F","000B6B","001322","001735","001A6D",
           "001BEB","001CDF","001E58","001FF4","0024D7","046C59","10683F","10C2BA",
           "14AEDB","244E7B","2C56DC","380BB4","4CB1CD","5477A6","60D262","780CB8",
           "88E603","8C882B","9CEFD5","B0B98A","B4EE25","C46E1F","D0ABD5","DC7114",
           "EC089B","F8A9D0","FCDC4A"], "Qualcomm"),
        // Broadcom
        (&["000AF5","001018","001BE9","001BFC","00101F","002636","002643","00904C",
           "10F1F2","14ABC5","20F532","283B82","401216","549F35","60019B","6455B1",
           "78DD12","904C81","98F058","A43135","AC81F3","B0B867","C0335A","C44BD1",
           "D8B04C","E8BA70","F832E4"], "Broadcom"),
        // Google / Nest
        (&["00A2F4","00A2FE","08189A","1C2D3F","283F69","307096","3420E3","3C5AB4",
           "485D60","48D6D5","54609A","549B12","5C4A1F","7C2EBD","84D611","94EB2C",
           "A4770D","B4F5A4","D4A932","F4F5E8","F4F5DB","F8FF0B","18B430","6C3C7C",
           "642001"], "Google"),
        // TP-Link
        (&["005F67","08107B","10FED5","14CFED","14EBB6","18A6F7","1C3BF3","1C610A",
           "200A17","2C4D54","30B49E","34E894","3CE82F","409F38","442C05","484D7E",
           "50C7BF","50D4F7","544B8C","5C628B","5CE931","60A4B7","60E327","646E97",
           "6C5AB0","703A51","7405A5","7844FD","788CB5","7C2612","7CC2C6","8416F9",
           "8C210A","A42BB0","A458FA","A842A1","AC84C6","B07FB9","B09575","B0952C",
           "B0A7B9","B4B024","B89AED","C025E9","C04A00","CC3220","D46E0E","D8075A",
           "D85D4C","DC2C6E","E894F6","F0A731","F45595","F4EC38","F8D111"], "TP-Link"),
        // Netgear
        (&["000F66","00146C","001830","001B2F","001E2A","001F33","002326","00249B",
           "A021B7","B03956","C03F0E","C43DC7","C89E43","CC40D0","DC9FDB","E091F5",
           "E0469A","E4F4C6","F87394","FC3909","20E52A","2C3033","3894ED","44A56E",
           "4C60DE","6CB0CE","744401","84845B","8C3BAD","9CD36D","B0487A","B86A97",
           "E0AAC7","E4186B","204E7F","6045CB"], "Netgear"),
        // Cisco / Meraki
        (&["000744","000E38","001009","001042","001064","0011BB","0012DA","001562",
           "001636","0017E0","001924","001C58","001E14","001F26","002369","00248D",
           "002618","006440","008030","00DAAA","0C7523","0C8D15","100D7F","18339D",
           "28C7CE","2C0B52","2CABA4","30E4DB","3C5EC3","40B3CD","44ADD9","48DF37",
           "4C830A","5CE176","5CF4AB","64100B","642DB7","68EFBD","6C41C5","70DF2F",
           "742B0F","78DA6E","7C95F3","80E01D","84B515","88432F","881DFC","8842E1",
           "8CB64F","90217A","9077EE","94D469","98002B","98FCD4","A4187A","A44C11",
           "A80CCA","AC17C8","B07D47","B0FAEB","B4A8B9","C0A0BB","C4464F","C473EB",
           "D0A5A6","D4A025","D8D385","DC7137","E05FB9","E06CE5","E48F3A","EC447D",
           "F07F06","F40F1B","F44B2A","F8C2E1","FC5B39","0C2724","00186B"], "Cisco"),
        // Ubiquiti
        (&["002722","002689","00156D","04188B","0418D6","18E829","245A4C","248A07",
           "249A0C","24A43C","287AEE","44D9E7","682E8F","686797","70A741","74301B",
           "74ACB9","7483C2","78456A","784558","78C1A7","802AA8","88702C","94B86D",
           "9CC9EB","ACEC80","B4FBE4","D021F9","D8B370","E063DA","E0D5BE","F09FC2",
           "FC2C88","FCECDA","788A20","261027"], "Ubiquiti"),
        // Microsoft / Xbox
        (&["001DD8","002481","0025AE","0050F2","28185C","2CB05D","3CFA43","48D7D0",
           "502F9B","5CC5D4","60456B","6C5D3A","7C1E52","80C5E6","98E7F4","B46921",
           "B48255","C47454","C83DDC","D48FFF","DC537C","F45F92"], "Microsoft"),
        // Huawei / Honor
        (&["000FE2","001E10","002568","00E0FC","044F4C","087402","0C96BF","10C61F",
           "1C8E5C","20A680","241FA0","282CB2","30D17E","3818C3","407D0F","44C346",
           "48435A","4C5499","547FE1","582AF7","5C09D7","60DE44","70728B","74D02B",
           "78D752","7CB15D","80B686","84DBAC","88A2D7","8CEBC6","9017AC","9C741A",
           "A088B4","A4BA76","AC4E91","B4FB06","C0BFA7","C48524","CC96A0","D065CA",
           "D45FA0","D82434","DC094C","E0247F","E0ACCB","E47E66","EC4D47","F44C7F",
           "F4E366","FC48EF","FCED32","048D38","A4DCBE","E8088B","680774"], "Huawei"),
        // MediaTek / Ralink
        (&["000C43","001369","001C51","00900C","000CE6","101248","14C21D","245CE3",
           "286CEE","3C8BCD","4CE676","5C3A3D","68698E","74E5F9","80A2E4","94DBD3",
           "A0F4C3","A4DB30","B8DA36","C8FA3E","CCAF78","D0224A","D45D42","D8B12A",
           "DC7FA4","E86BFB","EC0187","F07D68","F0D7AA","F87393"], "MediaTek"),
        // Realtek
        (&["001492","001DE2","008248","009ED5","00E04C","100D2F","107B44","10D07A",
           "149FE8","1C4B44","284CA8","2CB7F6","3C33CA","3C52A1","48022A","48EE0C",
           "4CED33","504B71","54B80A","588694","5882A8","606BFF","64B70F","70F191",
           "74D02B","84C9B2","8CEBFF","9007C6","90DE80","983B16","A0A4C5","A861AA",
           "B8D70B","C0E435","C86C3D","CC2F71","D05BA8","D42C44","D86CE9","DC294F",
           "E80462","EC10E4","F80462","F81A67","FC018C","52D423"], "Realtek"),
        // Amazon / Ring / Eero
        (&["00FC8B","0C47C9","10A532","18742E","1CE750","2C2617","34D270","3C5CC4",
           "40B4CD","441CA8","44D22C","50DCE7","50F5DA","5C415A","6837E9","6854FD",
           "6C5697","747B7A","7493A4","74C14F","74D637","80E7BA","8471B6","88716C",
           "A002DC","A0D0DC","AC63BE","B47C9C","B80966","C0BDA7","CC9E00","D4F987",
           "F0272D","F0D2F1","F481D4","FCA180","FCA667","FCC2DE"], "Amazon"),
        // Aruba / HPE
        (&["000B86","00248C","001A1E","00247E","002655","04BD88","0C524C","18DE43",
           "1CC1DE","204C9E","24DEC6","38FF36","40E3D6","4485E7","5C8A38","6CF37F",
           "708B78","749C37","841B5E","8C8C50","901B0E","94B40F","9C1C12","A08CFD",
           "AC3FA4","B47AF1","B831B5","C0B8E6","D4C940","D8C7C8","F06E3F","F0B052",
           "F40343","D8D385","2CF8F0"], "Aruba"),
        // Arris / CommScope / Motorola (cable modems, gateways)
        (&["000159","001DD3","001E5A","001F7E","002395","002684","00904B","0C7523",
           "10868C","141877","149528","1C1448","1CAAB8","201F31","2C9E5F","309BAD",
           "3C3678","3C7A8A","44E137","54E2D5","58696C","587E61","5C571A","649968",
           "6CCDD6","70B14E","707630","74E2F5","78719C","801F02","842614","8C7A15",
           "941882","94877C","985FD3","9C3743","A00460","A07B95","A4ED4E","AA4411",
           "B077AC","B4F2E8","BC643F","C067AF","C4017C","C854A4","D404FF","D80DE3",
           "E05597","E46449","E86D52","E8ED05","F023AE","F4CFE2","F82DC0","FC517E",
           "001CAC","04E5F4","106F3F","58D02F"], "Arris"),
        // Sagemcom (ISP routers)
        (&["000FA5","002569","6C2E85","7444B7","80D21D","84A1D1","88718C","A4DBD1",
           "B0B2DC","CC33BB","D08A55","D0542D","D432A8","F4CA24","F89E28"], "Sagemcom"),
        // Technicolor / Thomson (ISP routers)
        (&["000E7B","000FA3","001D4C","001F9F","002236","002692","00265B","0026B8",
           "181BEB","34FCB9","4C4CFF","589835","64BF1B","78F2FC","801082","84260B",
           "BC60A7","C0D044","E4BEED","F8D0BD","1CB72C","506255","2CA17D"], "Technicolor"),
        // Actiontec (ISP gateways)
        (&["001801","001AA2","001F90","002635","003A9B","049F81","105F06","141F78",
           "20E564","3C4C69","44656B","54498B","749CE3","80F503","848DC7","886AE3",
           "8C7F3B","AC2005","C84C75","CC7D37","D4F9A1","F82441"], "Actiontec"),
        // Sonos
        (&["000E58","0004ED","34448E","48A6B8","5CAAFD","7828CA","789ED0","808098",
           "94FA2B","9C52F8","A8D095","B05F38","B09087","B8E937","C84A6B","D47856",
           "F0F6C1"], "Sonos"),
        // Roku
        (&["000F25","08058B","102B41","10596E","20EF55","3C5D2E","408B07","440E7B",
           "504E72","6820DB","843EB5","8C499B","9C9568","A016DC","A8B5AF","AC3A7A",
           "B0A737","B83E59","BC5F2E","C889F3","CC6DA0","D0030E","D43443","D83ADD",
           "DC3A5E","E835FB","F44E0B","FC8CF0"], "Roku"),
        // Verizon / Fios
        (&["001A2B","4C09D4","B4A5EF","205D47","0024D4","8C6D12","206A8A"], "Verizon"),
        // Comcast / Xfinity
        (&["74E543","F42B7D","88F7C7","A4E4B8","3C3786","68B6FC"], "Xfinity"),
        // Espressif (ESP8266/ESP32)
        (&["10521C","184490","188302","1C9DC2","240AC4","2462AB","2CF432","3010DE",
           "30C6F7","3C6105","40F520","4CEF77","500291","54325A","58BF25","5C5F67",
           "60019B","607EE3","7008C8","70B8F6","7C9EBD","7CDFA1","807D3A","840D8E",
           "8C4B14","8CA982","906C1A","940418","980015","9C9C1F","A020A6","A4CF12",
           "AC0BFB","B0B21C","B4E842","BC5436","C0C9E3","C44F33","C46E7B","C4D8D5",
           "CC50E3","CC7B5C","CCDEA6","D4D4DA","D8A01D","D8BFC0","DC4F22","E0E2E6",
           "E868E7","EC64C9","ECDA3B","F008D1","F42709","F4CFA2"], "Espressif"),
        // Xiaomi
        (&["000913","04CF8C","08152F","0C1DCF","10BF48","14F65A","18598B","1CB298",
           "202564","24A05A","2816AD","2C28B7","34234A","3CC19C","4034A4","44232C",
           "4CBB58","507E5D","50BD5F","58447E","5C0272","5CF2F0","60AB67","641232",
           "681AB2","702A97","74239C","78114E","7C1C68","80AD16","84547C","888E29",
           "8C392A","98FAE3","A462F1","A86C5E","A8ECA5","AC0BFB","B0E235","B4E3F9",
           "BCA5A9","C0DAA8","C440A0","C4A36D","C870E5","CC9891","D0DACE","D41F0C",
           "D87CD5","E0C7EC","E4B3E6","EC5C68","F04914","F0C853","F48B32","F8D010",
           "FC64BA"], "Xiaomi"),
        // Ruckus / Brocade
        (&["000C43","001A2B","00222D","0025C4","00248D","24C96D","38E603","58B633",
           "600F21","64B14E","70717F","A0E453","C0DB40","C49F4C","CC0080","E44E17",
           "F0B052","F4521C","00E012"], "Ruckus"),
        // ZTE
        (&["000648","000FA1","000FE2","001E73","002293","0024F4","002D76","0071CC",
           "047900","085AE0","087AF1","0C3DDE","142E5E","1CA770","2C26C5","2C7B6B",
           "302DE8","344DEA","3C5726","4C4900","5496A7","68776B","6CDCA4","74472C",
           "78310F","789682","78A714","7CE97C","80AAFE","84742A","84E0F4","900F0C",
           "905F2E","94A7B7","984FEE","9C063D","A0B549","A0F479","AC6462","B0C728",
           "C468D0","CC1AFA","D0608C","D474E3","D4976A","E09793","E4A7C5","EC837E",
           "EC8A4C","F04A93","F0E4A2","F461C2","F8F082","FCED32"], "ZTE"),
        // Linksys (Belkin)
        (&["000C41","000E08","000F66","001217","001310","001B11","001D7E","001EE5",
           "001F9D","002129","002275","0024B2","00259C","1C4419","20AA4B","305A3A",
           "38B13A","44032C","582AF7","58EF68","60560E","68C44D","74447E","787E61",
           "786A89","8863DF","A020A6","A0F3C1","C05627","C46C55","C8D719","D8EC5E",
           "E8F724","F07D68","F4CFE2","383BC8"], "Linksys"),
        // ASUS
        (&["000C6E","000EA6","001731","001BFC","001D60","00E018","04421A","04D4C4",
           "049226","08606E","086266","0C9D92","10BF48","10C37B","107B44","14DAE9",
           "14DDA9","1831BF","1C872C","1CB72C","2054FA","244BFE","2CFD37","2CFDAB",
           "305A3A","34E894","3CCED8","4025C2","40167E","4CEDFB","50465D","50EB71",
           "54B202","60A44C","60D1AA","6045CB","708BCD","7C10C9","8C10A2","90F652",
           "94DEF1","985600","9C5C8E","A036BC","A4B1E9","AC9E17","B06EBF","B453A9",
           "BC5FF4","C0A53E","C860C8","D45DC1","D850E6","E03F49","E0CB4E","F07959",
           "F42B7D","F46D04","F81A67","FC34E2"], "ASUS"),
        // Raspberry Pi Foundation
        (&["B827EB","D83ADD","DC2632","E45F01"], "RPi"),
    ];

    for &(prefixes, vendor) in entries {
        for prefix in prefixes {
            m.insert(prefix.to_string(), vendor.to_string());
        }
    }
    m
}

/// Look up vendor name by MAC address string "aa:bb:cc:dd:ee:ff"
pub fn lookup_vendor(mac: &str) -> String {
    let prefix = mac.replace(':', "").to_uppercase();
    if prefix.len() < 6 { return String::new(); }
    let oui = &prefix[..6];
    OUI_DB.get()
        .and_then(|db| db.get(oui))
        .cloned()
        .unwrap_or_default()
}

/// Look up vendor name by MacAddr
pub fn lookup_vendor_mac(mac: &crate::types::MacAddr) -> String {
    let oui = mac.oui_prefix();
    OUI_DB.get()
        .and_then(|db| db.get(&oui))
        .cloned()
        .unwrap_or_default()
}