mirror of
https://github.com/billz/raspap-webgui.git
synced 2025-03-01 10:31:47 +00:00
101 lines
3.4 KiB
PHP
101 lines
3.4 KiB
PHP
<?php
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/**
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* Linux iw parser class
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*
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* @description Parses output of iw to determine properties of a given physical device (phy)
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* @author Bill Zimmerman <billzimmerman@gmail.com>
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* @license https://github.com/raspap/raspap-webgui/blob/master/LICENSE
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* @see https://wireless.wiki.kernel.org/en/users/Documentation/iw
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*/
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declare(strict_types=1);
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namespace RaspAP\Parsers;
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class IwParser
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{
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private $iw_output;
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public function __construct(string $interface = 'wlan0')
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{
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// Resolve physical device for selected interface
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$iface = escapeshellarg($interface);
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$pattern = "iw dev | awk -v iface=".$iface." '/^phy#/ { phy = $0 } $1 == \"Interface\" { interface = $2 } interface == iface { print phy }'";
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exec($pattern, $return);
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$phy = $return[0];
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// Fetch 'iw info' output for phy
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$this->iw_output = shell_exec("iw $phy info");
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}
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/**
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* Parses raw output of 'iw info' command, filtering supported frequencies.
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*
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* Frequencies with the following regulatory restrictions are excluded:
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* (no IR): the AP won't Initiate Radiation until a DFS scan (or similar) is complete on these bands.
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* (radar detection): the specified channels are shared with radar equipment.
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* (disabled): self-explanatory.
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*/
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public function parseIwInfo()
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{
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$excluded = [
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"(no IR, radar detection)",
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"(radar detection)",
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"(disabled)",
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"(no IR)"
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];
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$excluded_pattern = implode('|', array_map('preg_quote', $excluded));
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$pattern = '/\*\s+(\d+)\s+MHz \[(\d+)\] \(([\d.]+) dBm\)\s(?!' .$excluded_pattern. ')/';
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$supportedFrequencies = [];
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// Match iw_output containing supported frequencies
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preg_match_all($pattern, $this->iw_output, $matches, PREG_SET_ORDER, 0);
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/* For frequencies > 5500 MHz only the following "channels" are allowed:
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* 100 108 116 124 132 140 149 157 184 192
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* @see https://w1.fi/cgit/hostap/tree/src/common/hw_features_common.c
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*/
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$allowed = [100, 108, 116, 124, 132, 140, 149, 157, 184, 192];
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foreach ($matches as $match) {
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$frequency = [
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'MHz' => (int)$match[1],
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'Channel' => (int)$match[2],
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'dBm' => (float)$match[3],
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];
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if ( ($frequency['MHz'] >= 5500 && in_array($frequency['Channel'], $allowed))
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|| $frequency['MHz'] < 5500 ) {
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$supportedFrequencies[] = $frequency;
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}
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}
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return $supportedFrequencies;
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}
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/**
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* Converts an ieee80211 frequency to a channel value
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* Adapted from iw source
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* @param int $freq
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* @see https://git.kernel.org/pub/scm/linux/kernel/git/jberg/iw.git/tree/util.c
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*/
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public function ieee80211_frequency_to_channel(int $freq)
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{
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/* see 802.11-2007 17.3.8.3.2 and Annex J */
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if ($freq == 2484) {
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return 14;
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} else if ($freq < 2484) {
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return ($freq - 2407) / 5;
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} else if ($freq >= 4910 && $freq <= 4980) {
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return ($freq - 4000) / 5;
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} else if ($freq <= 45000) { /* DMG band lower limit */
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return ($freq - 5000) / 5;
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} else if ($freq >= 58320 && $freq <= 64800) {
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return ($freq - 56160) / 2160;
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} else {
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return 0;
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}
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}
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}
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