43 lines
1.4 KiB
Plaintext
43 lines
1.4 KiB
Plaintext
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#!/bin/bash
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slog(){
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echo "$1" | sudo -u sats tee -a /home/sats/satsd/log/update.log > /dev/null;
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}
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HSALT="***SALT***";
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HPEPPER="***PEPPER***";
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slog ">>> Dynamic Wireless Credentials";
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# [1] Wifi scan for "SATS_*" APs
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#========================================================#
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# (1) Get interface name #
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IFACE=`ifconfig | grep -P "^w" | awk '{print $1}'`;
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# (2) Get nearest AP matching "SATS_*" and extract HASH #
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AP_HASH=`sudo iwlist wlan0 scan | grep -P "^\s*ESSID:\"SATS_.+\"\s*$" | sed 's/^[ \t]*ESSID:"SATS_//' | sed 's/"[ \t]*$//'`;
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# (3) Manage no AP found #
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test `echo -ne $AP_HASH | wc -l` -eq 0 && slog "no AP found" && exit;
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# [2] Calculate WIFI PASS from SSID hash
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#========================================================#
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PASS=`echo -ne "$HPEPPER$(echo -n "${HSALT}${AP_HASH}" | sha512sum | sed 's/[ \t]*-$//')" | sha512sum | sed 's/[ \t]*-//'`;
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# [3] Update 'wpa_supplicant.conf'
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#========================================================#
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# (1) Update SSID #
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sudo cat /etc/wpa_supplicant/wpa_supplicant.conf | sed "s/^[ \t]*ssid=.*$/\tssid=\"SATS_$AP_HASH\"/" | sudo tee /etc/wpa_supplicant/wpa_supplicant.tmp;
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# (2) Update PASS #
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sudo cat /etc/wpa_supplicant/wpa_supplicant.tmp | sed "s/^[ \t]*psk=.*$/\tpsk=\"$PASS\"/" | sudo tee /etc/wpa_supplicant/wpa_supplicant.conf;
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# (3) Remove tmp file #
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sudo rm /etc/wpa_supplicant/wpa_supplicant.tmp;
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slog "<<< Done";
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