wifi_scan 0.6.3

A crate to list WiFi hotspots in your area. Fork of booyaa/wifiscanner with many improvements to make it future-proof.
Documentation 
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use crate::{Error, Result, Wifi};

use libwifi::{frame::components::RsnAkmSuite, parsers::parse_rsn_information};
use win32_wlan::query_system_interfaces;

/// Returns a list of WiFi hotspots in your area - Windows uses the `win32-wlan` crate.
pub fn scan() -> Result<Vec<Wifi>> {
    let interfaces = futures::executor::block_on(query_system_interfaces())
        .map_err(|e| Error::InterfaceError(e.to_string()))?;

    if let Some(interface) = interfaces.first() {
        let networks = interface
            .blocking_scan()
            .map_err(|e| Error::ScanFailed(e.to_string()))?;

        let wifi_list = networks
            .iter()
            .filter_map(|network| {
                network.ssid().map(|ssid| Wifi {
                    mac: network.bss_id().to_string(),
                    ssid: ssid.to_string(),
                    channel: get_channel(network.ch_center_frequency() / 1000),
                    signal_level: format!("{:.2}", network.rssi() as f64),
                    security: get_security(network.information_frame()),
                })
            })
            .collect();

        Ok(wifi_list)
    } else {
        Err(Error::InterfaceError(
            "No WiFi interfaces found".to_string(),
        ))
    }
}

fn get_channel(frequency: u32) -> String {
    if (2412..=2472).contains(&frequency) {
        ((frequency - 2407) / 5).to_string()
    } else if frequency == 2484 {
        "14".to_string() // japan
    } else if (5180..=5895).contains(&frequency) {
        ((frequency - 5000) / 5).to_string()
    } else if (5955..=7115).contains(&frequency) {
        ((frequency - 5950) / 5).to_string()
    } else {
        "Unknown".to_string()
    }
}

fn get_security(ie_data: &[u8]) -> String {
    let mut has_rsn = false;
    let mut has_wpa = false;
    let mut securities = Vec::new();

    let mut i = 0;
    while i + 1 < ie_data.len() {
        let element_id = ie_data[i];
        let length = ie_data[i + 1] as usize;

        if i + 2 + length > ie_data.len() {
            break;
        }

        let element_data = &ie_data[i + 2..i + 2 + length];

        match element_id {
            48 => {
                has_rsn = true;
                if let Ok(rsn) = parse_rsn_information(element_data) {
                    let sec = format_security(&rsn.akm_suites);
                    if !sec.is_empty() {
                        securities.push(sec);
                    }
                }
            }
            221 => {
                if length >= 4 {
                    let oui = &element_data[0..3];
                    if oui == [0x00, 0x50, 0xF2] && element_data.get(3) == Some(&0x01) {
                        has_wpa = true;
                        securities.push("WPA-PSK".to_string());
                    }
                }
            }
            _ => {}
        }

        i += 2 + length;
    }

    if securities.is_empty() {
        if has_rsn || has_wpa {
            "WPA/WPA2".to_string()
        } else {
            "Open".to_string()
        }
    } else {
        securities.join(", ")
    }
}

fn format_security(akm_suites: &[RsnAkmSuite]) -> String {
    let mut securities = Vec::new();

    for akm_suite in akm_suites {
        let security = match akm_suite {
            RsnAkmSuite::PSK => "WPA2-Personal (PSK)",
            RsnAkmSuite::SAE => "WPA3-Personal (SAE)",
            RsnAkmSuite::EAP => "WPA2-Enterprise (EAP)",
            RsnAkmSuite::EAP256 => "WPA3-Enterprise (EAP-256)",
            RsnAkmSuite::EAPFT => "WPA2-Enterprise (EAP-FT)",
            RsnAkmSuite::PSK256 => "WPA3-Personal (PSK-256)",
            RsnAkmSuite::PSKFT => "WPA2-Personal (PSK-FT)",
            RsnAkmSuite::SUITEBEAP256 => "WPA3-Enterprise (Suite-B EAP-256)",
            _ => "",
        };

        if !security.is_empty() {
            securities.push(security.to_string());
        }
    }

    if securities.is_empty() {
        "WPA2".to_string()
    } else {
        securities.join(", ")
    }
}