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@tetsuharu-kono
Last active January 30, 2023 00:14
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Wi-Fi site survey script for macOS
#!/bin/zsh
# Wi-Fi Site Survey
# 2020.07.22 Rev. 0.1
# First release
# 2023.01.30 Rev. 0.2
# Fixed channel and BSSID not being retrieved by Monterey
# Fail on unset variables and command errors
set -ue -o pipefail
# Prevent commands misbehaving due to locale differences
export LC_ALL=C
# Signal Strength
S_MIN=100
S_MAX=-100
S_SUM=0
# Noise
N_MIN=100
N_MAX=-100
N_SUM=0
# Signal-to-Noise Ratio
SNR_MIN=100
SNR_MAX=-100
SNR_SUM=0
NUM=0
while true; do
# 2023.01.30 Monterey now requires sudo to get BSSID
wireless_info=(`(IFS=$'\n';sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I | tr -d ' ')`)
NUM=$((NUM+1))
# 必要な情報を抽出
# 2023.01.30 Channel information changed to 17th element in array in Monterey
S="${wireless_info[1]##*:}"
N="${wireless_info[3]##*:}"
AUTH="${wireless_info[11]#*:}"
BSSID="${wireless_info[12]#*:}"
SSID="${wireless_info[13]##*:}"
CH="${wireless_info[17]##*:}"
# Signal Strength min
if [ ${S} -lt ${S_MIN} ]; then
S_MIN=${S}
fi
# Signal Strength max
if [ ${S} -gt ${S_MAX} ]; then
S_MAX=${S}
fi
# Signal Strength avg
S_SUM=$((S_SUM+S))
S_AVG=$((S_SUM/NUM))
# Noise min
if [ ${N} -lt ${N_MIN} ]; then
N_MIN=${N}
fi
# Noise max
if [ ${N} -gt ${N_MAX} ]; then
N_MAX=${N}
fi
# Noise avg
N_SUM=$((N_SUM+N))
N_AVG=$((N_SUM/NUM))
# SNR min
SNR=$((S-N))
if [ ${SNR} -lt ${SNR_MIN} ]; then
SNR_MIN=${SNR}
fi
# SNR max
if [ ${SNR} -gt ${SNR_MAX} ]; then
SNR_MAX=${SNR}
fi
# SNR avg
SNR_SUM=$((SNR_SUM+SNR))
SNR_AVG=$((SNR_SUM/NUM))
# ASCIIグラフ(50桁)
LENGTH_S=$(((100+S)/2));
LENGTH_N=$(((100+N)/2));
LENGTH_SNR=$((SNR/2));
GRAPH_S=$(printf "%-50s" `printf %${LENGTH_S}s | sed "s/ /\|/g"`)
GRAPH_N=$(printf "%-50s" `printf %${LENGTH_N}s | sed "s/ /\|/g"`)
GRAPH_SNR=$(printf "%-50s" `printf %${LENGTH_SNR}s | sed "s/ /\|/g"`)
# Signal Strength ASCIIグラフカラー
if [ $S -gt -40 ]; then
# Excellent - blue
GRAPH_S="\e[34m${GRAPH_S}\e[m"
elif [ $S -gt -50 ]; then
# Good - green
GRAPH_S="\e[32m${GRAPH_S}\e[m"
elif [ $S -gt -60 ]; then
# Fair - yellow
GRAPH_S="\e[33m${GRAPH_S}\e[m"
elif [ $S -gt -70 ]; then
# Poor - orange
GRAPH_S="\033[38;5;202m${GRAPH_S}\033[m"
else
# Bad - red
GRAPH_S="\e[31m${GRAPH_S}\e[m"
fi
# Signal-to-Noise Ratio ASCIIグラフカラー
if [ $SNR -ge 30 ]; then
# Excellent - blue
GRAPH_SNR="\e[34m${GRAPH_SNR}\e[m"
elif [ $SNR -ge 25 ]; then
# Good - green
GRAPH_SNR="\e[32m${GRAPH_SNR}\e[m"
elif [ $SNR -ge 20 ]; then
# Fair - yellow
GRAPH_SNR="\e[33m${GRAPH_SNR}\e[m"
elif [ $SNR -ge 15 ]; then
# Poor - orange
GRAPH_SNR="\033[38;5;202m${GRAPH_SNR}\033[m"
else
# Bad - red
# GRAPH_SNR="\e[31m${GRAPH_SNR}\e[m"
GRAPH_SNR="\033[38;5;160m${GRAPH_SNR}\033[m"
fi
# 画面表示
clear
echo "Wi-Fi Site Survey(elapsed time: ${NUM} sec)"
echo -e "SSID: ${SSID}(${AUTH:u}/ch=${CH}MHz/${BSSID})"
echo -e " S: ${GRAPH_S} ${S} dBm (min/avg/max = ${S_MIN}/${S_AVG}/${S_MAX} dBm)"
echo -e " N: ${GRAPH_N} ${N} dBm (min/avg/max = ${N_MIN}/${N_AVG}/${N_MAX} dBm)"
echo -e " SNR: ${GRAPH_SNR} ${SNR} dB (min/avg/max = ${SNR_MIN}/ ${SNR_AVG}/ ${SNR_MAX} dB)"
sleep 1
done
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