intval3/lib/wifi/index.js

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'use strict'
const networkPattern = /network[\s\S]*?=[\s\S]*?{([\s\S]*?)}/gi
const quoteRe = new RegExp('"', 'g')
const filePath = '/etc/wpa_supplicant/wpa_supplicant.conf'
const reconfigure = '/sbin/wpa_cli reconfigure'
const refresh = '/sbin/ifdown wlan0 && /sbin/ifup --force wlan0'
const iwlist = '/sbin/iwlist wlan0 scanning | grep "ESSID:"'
const iwgetid = '/sbin/iwgetid'
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const log = require('../log')('wifi')
const exec = require('child_process').exec
const fs = require('fs')
let _entry = null
let _ssid = null
let _cb = null
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/** Class representing the wifi features */
class Wifi {
constructor () {
}
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/**
* List available wifi access points
*
* @param {function} callback Function which gets invoked after list is returned
*/
list (callback) {
exec(iwlist, (err, stdout, stderr) => {
if (err) {
console.error(err)
return callback(err)
}
const lines = stdout.split('\n')
let output = []
let line
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let i = 0
for (let l of lines) {
line = l.replace('ESSID:', '').trim()
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if (line !== '""' && i < 5) {
line = line.replace(quoteRe, '')
output.push(line)
}
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i++
}
output = output.filter(ap => {
if (ap !== '') return ap
})
return callback(null, output)
})
}
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/**
* (internal function) Invoked after config file is read,
* then invokes file write on the config file
*
* @param {object} err (optional) Error object only present if problem reading config file
* @param {string} data Contents of the config file
*/
_readConfigCb (err, data) {
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let parsed
let current
if (err) {
console.error(err)
return _cb(err)
}
parsed = this._parseConfig(data)
current = parsed.find(network => {
return network.ssid === _ssid
})
if (typeof current !== 'undefined') {
data = data.replace(current.raw, _entry)
} else {
data += '\n\n' + _entry
}
_entry = null
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fs.writeFile(filePath, data, 'utf8', this._writeConfigCb.bind(this))
}
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/**
* (internal function) Invoked after config file is written,
* then executes reconfiguration command
*
* @param {object} err (optional) Error object only present if problem writing config file
*/
_writeConfigCb (err) {
if (err) {
console.error(err)
return _cb(err)
}
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exec(reconfigure, this._reconfigureCb.bind(this))
}
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/**
* (internal function) Invoked after reconfiguration command is complete
*
* @param {object} err (optional) Error object only present if configuration command fails
* @param {string} stdout Standard output from reconfiguration command
* @param {string} stderr Error output from command if fails
*/
_reconfigureCb (err, stdout, stderr) {
if (err) {
console.error(err)
return _cb(err)
}
console.log('Wifi reconfigured')
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exec(refresh, this._refreshCb.bind(this))
}
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/**
* (internal function) Invoked after wifi refresh command is complete
*
* @param {object} err (optional) Error object only present if refresh command fails
* @param {string} stdout Standard output from refresh command
* @param {string} stderr Error output from command if fails
*/
_refreshCb (err, stdout, stderr) {
if (err) {
console.error(err)
return _cb(err)
}
console.log('Wifi refreshed')
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_cb(null, { ssid : _ssid })
_cb = () => {}
}
_parseConfig (str) {
const networks = []
const lines = str.split('\n')
let network = {}
for (let line of lines) {
if (line.substring(0, 9) === 'network={') {
network = {}
network.raw = line
} else if (network.raw && line.indexOf('ssid=') !== -1) {
network.ssid = line.replace('ssid=', '').trim().replace(quoteRe, '')
if (network.raw) {
network.raw += '\n' + line
}
} else if (network.raw && line.substring(0, 1) === '}') {
network.raw += '\n' + line
networks.push(network)
network = {}
} else if (network.raw) {
network.raw += '\n' + line
}
}
return networks
}
/**
* Create sanitized wpa_supplicant.conf stanza for
* configuring wifi without storing plaintext passwords
* @example
* network={
* ssid="YOUR_SSID"
* #psk="YOUR_PASSWORD"
* psk=6a24edf1592aec4465271b7dcd204601b6e78df3186ce1a62a31f40ae9630702
* }
*
* @param {string} ssid SSID of wifi network
* @param {string} pwd Plaintext passphrase of wifi network
* @param {function} callback Function called after psk hash is generated
*/
createPSK (ssid, pwd, callback) {
const cmd = `wpa_passphrase "${ssid}" "${pwd}" | grep "psk="`
let lines
let hash
let plaintext
exec(cmd, (err, stdout, stderr) => {
if (err) {
return callback(err)
}
lines = stdout.replace('#psk=', '').split('psk=')
hash = lines[1]
plaintext = lines[0]
callback(null, hash.trim(), plaintext.trim())
})
}
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/**
* Function which initializes the processes for adding a wifi access point authentication
*
* @param {string} ssid SSID of network to configure
* @param {string} pwd Password of access point, plaintext to be masked
* @param {string} hash Password/SSID of access point, securely hashed
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* @param {function} callback Function invoked after process is complete, or fails
*/
setNetwork (ssid, pwd, hash, callback) {
let masked = pwd.split('').map(char => { return char !== '"' ? '*' : '"' }).join('')
_entry = `network={\n\tssid="${ssid}"\n\t#psk=${masked}\n\tpsk=${hash}\n}\n`
_cb = callback
_ssid = ssid
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fs.readFile(filePath, 'utf8', this._readConfigCb.bind(this))
}
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/**
* Executes command which gets the currently connected network
*
* @param {function} callback Function which is invoked after command is completed
*/
getNetwork (callback) {
let output
exec(iwgetid, (err, stdout, stderr) => {
if (err) {
return callback(err)
}
output = stdout.split('ESSID:')[1].replace(quoteRe, '').trim()
callback(null, output)
})
}
}
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module.exports = new Wifi()