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wifichannel.sh
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#!/bin/bash
# This tool converts channel number to center frequency in MHz, and vice versa
# Author: Jiri Brejcha, [email protected], @jiribrejcha
# Idea sparked by Nick Turner @nickjvturner, thanks to Adrian Granados @adriangranados and Keith Parsons @KeithRParsons
INPUT="$1"
BAND=""
VERSION="1.0.9"
SCRIPT_NAME="$(basename "$0")"
usage(){
echo "Converts channel number to center frequency in MHz, and vice versa."
echo
echo "Usage:"
echo " $SCRIPT_NAME <channel-number>"
echo " $SCRIPT_NAME <center-frequency>"
echo " $SCRIPT_NAME [options]"
echo
echo "Options:"
echo " -v, --version Show version"
echo " -h, --help Show this screen"
echo " -2, -2.4 List all 2.4 GHz channels"
echo " -5 List all 5 GHz channels"
echo " -6 List all 6 GHz channels"
echo
exit 0
}
version(){
echo "$VERSION"
exit 0
}
# Checks if it is a valid 2.4, 5 or 6 GHz channel or frequency
invalid_input(){
if [ -z "$BAND" ]; then
echo "Error: Invalid channel number or frequency. Use \"-h\" for help."
exit 1
fi
}
# Only accept a single or no argument
if [ "$#" -gt 2 ]; then
invalid_input
fi
# 5 GHz channels
ALL_5_CHANNELS=(36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 100 102 104 106 108 110 112 114 116 118 120 122 124 126 128 132 134 136 138 140 142 144 149 151 153 155 157 159 161 165 169 173 177 181)
UNBONDED_5_CHANNELS=(36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 144 149 153 157 161 165 169 173 177 181)
UNII_1_CHANNELS=(36 38 40 42 44 46 48)
UNII_2A_CHANNELS=(52 54 56 58 60 62 64)
UNII_2C_CHANNELS=(100 102 104 106 108 110 112 114 116 118 120 122 124 126 128 132 134 136 138 140 142 144)
UNII_3_CHANNELS=(149 151 153 155 157 159 161 165)
UNII_4_CHANNELS=(169 173 177 181)
# List all 2.4 GHz channels
show_all_2_4(){
for i in {1..14}; do
INPUT="$i"
if [ "$INPUT" -eq 14 ]; then
BAND="2.4"
echo "Band: $BAND GHz Channel: $INPUT Center freq: 2484 MHz Recommended: No"
elif [ "$INPUT" -ge 1 ] && [ "$INPUT" -le 13 ]; then
BAND="2.4"
PAD=""
if [ "$INPUT" -ge 1 ] && [ "$INPUT" -le 9 ]; then
PAD=" "
fi
if [ "$INPUT" -eq 1 ] || [ "$INPUT" -eq 6 ] || [ "$INPUT" -eq 11 ]; then
echo "Band: $BAND GHz Channel:$PAD $INPUT Center freq: $((($INPUT * 5) + 2407)) MHz Recommended: Yes"
else
echo "Band: $BAND GHz Channel:$PAD $INPUT Center freq: $((($INPUT * 5) + 2407)) MHz Recommended: No"
fi
fi
done
exit 0
}
# List all 5 GHz channels
show_all_5(){
BAND="5"
for INPUT in "${UNBONDED_5_CHANNELS[@]}"; do
if [[ " ${UNII_1_CHANNELS[*]} " =~ " ${INPUT} " ]]; then
echo "Band: $BAND GHz Channel: $INPUT Center freq: $((($INPUT * 5) + 5000)) MHz U-NII-1"
elif [[ " ${UNII_2A_CHANNELS[*]} " =~ " ${INPUT} " ]]; then
echo "Band: $BAND GHz Channel: $INPUT Center freq: $((($INPUT * 5) + 5000)) MHz U-NII-2A"
elif [[ " ${UNII_2C_CHANNELS[*]} " =~ " ${INPUT} " ]]; then
echo "Band: $BAND GHz Channel: $INPUT Center freq: $((($INPUT * 5) + 5000)) MHz U-NII-2C"
elif [[ " ${UNII_3_CHANNELS[*]} " =~ " ${INPUT} " ]]; then
echo "Band: $BAND GHz Channel: $INPUT Center freq: $((($INPUT * 5) + 5000)) MHz U-NII-3"
fi
done
exit 0
}
# List all 6 GHz channels
show_all_6(){
BAND="6"
for INPUT in {1..233}; do
# Workout padding
PAD=""
if [ ${#INPUT} -eq 1 ]; then
PAD=" "
elif [ ${#INPUT} -eq 2 ]; then
PAD=" "
fi
# Indicate lower or upper 6 GHz to illustrate difference between countries using 500 MHz and 1200 MHz
if [ $INPUT -le 93 ]; then
LOWER_UPPER="Lower 6 GHz"
else
LOWER_UPPER="Upper 6 GHz"
fi
if [ $(($INPUT%4)) -eq 1 ]; then
if [ $(($INPUT%16)) -eq 5 ]; then
echo "Band: $BAND GHz Channel:$PAD $INPUT Center freq: $((($INPUT * 5) + 5950)) MHz PSC: Yes $LOWER_UPPER"
else
echo "Band: $BAND GHz Channel:$PAD $INPUT Center freq: $((($INPUT * 5) + 5950)) MHz PSC: No $LOWER_UPPER"
fi
fi
done
exit 0
}
# Convert frequency in MHz to channel number
freq_to_channel(){
# 2.4 GHz
if [ "$INPUT" -eq 2484 ]; then
BAND="2.4"
echo "Band: $BAND GHz Channel: 14 Recommended: No"
elif [ "$INPUT" -ge 2412 ] && [ "$INPUT" -lt 2484 ] && [ $(($INPUT%2412%5)) -eq 0 ]; then
BAND="2.4"
CHANNEL_2_4="$(((($INPUT - 2412) / 5) + 1))"
if [ "$CHANNEL_2_4" -eq 1 ] || [ "$CHANNEL_2_4" -eq 6 ] || [ "$CHANNEL_2_4" -eq 11 ]; then
echo "Band: $BAND GHz Channel: $CHANNEL_2_4 Recommended: Yes"
else
echo "Band: $BAND GHz Channel: $CHANNEL_2_4 Recommended: No"
fi
# 5 GHz
elif [ "$INPUT" -ge 5160 ] && [ "$INPUT" -le 5905 ] && [ $(($INPUT%5)) -eq 0 ]; then
CHANNEL_5="$(((($INPUT - 5180) / 5) + 36))"
if [[ " ${ALL_5_CHANNELS[*]} " =~ " ${CHANNEL_5} " ]]; then
BAND="5"
if [[ " ${UNII_1_CHANNELS[*]} " =~ " ${CHANNEL_5} " ]]; then
echo "Band: $BAND GHz Channel: $CHANNEL_5 Center freq: $INPUT MHz U-NII-1"
elif [[ " ${UNII_2A_CHANNELS[*]} " =~ " ${CHANNEL_5} " ]]; then
echo "Band: $BAND GHz Channel: $CHANNEL_5 Center freq: $INPUT MHz U-NII-2A"
elif [[ " ${UNII_2C_CHANNELS[*]} " =~ " ${CHANNEL_5} " ]]; then
echo "Band: $BAND GHz Channel: $CHANNEL_5 Center freq: $INPUT MHz U-NII-2C"
elif [[ " ${UNII_3_CHANNELS[*]} " =~ " ${CHANNEL_5} " ]]; then
echo "Band: $BAND GHz Channel: $CHANNEL_5 Center freq: $INPUT MHz U-NII-3"
elif [[ " ${UNII_4_CHANNELS[*]} " =~ " ${CHANNEL_5} " ]]; then
echo "Band: $BAND GHz Channel: $CHANNEL_5 Center freq: $INPUT MHz U-NII-4"
fi
fi
# 6 GHz
elif [ "$INPUT" -ge 5955 ] && [ "$INPUT" -le 7115 ]; then
CHANNEL_6="$(((($INPUT - 5955) / 5) + 1))"
# Indicate lower or upper 6 GHz to illustrate difference between countries using 500 MHz and 1200 MHz
if [ $CHANNEL_6 -le 93 ]; then
LOWER_UPPER="Lower 6 GHz"
else
LOWER_UPPER="Upper 6 GHz"
fi
# Valid 6 GHz PSC channel
if [ $(($CHANNEL_6%4)) -eq 1 ] && [ $(($CHANNEL_6%16)) -eq 5 ]; then
BAND="6"
echo "Band: $BAND GHz Channel: $CHANNEL_6 PSC: Yes $LOWER_UPPER"
# Valid 6 GHz non-PSC channel
elif [ $(($CHANNEL_6%4)) -eq 1 ]; then
BAND="6"
echo "Band: $BAND GHz Channel: $CHANNEL_6 PSC: No $LOWER_UPPER"
fi
fi
invalid_input
}
# Convert channel number to frequency in MHz
channel_to_freq(){
# 2.4 GHz
if [ "$INPUT" -eq 14 ]; then
BAND="2.4"
echo "Band: $BAND GHz Channel: $INPUT Center freq: 2484 MHz Recommended: No"
elif [ "$INPUT" -ge 1 ] && [ "$INPUT" -le 13 ]; then
BAND="2.4"
if [ "$INPUT" -eq 1 ] || [ "$INPUT" -eq 6 ] || [ "$INPUT" -eq 11 ]; then
echo "Band: $BAND GHz Channel: $INPUT Center freq: $((($INPUT * 5) + 2407)) MHz Recommended: Yes"
else
echo "Band: $BAND GHz Channel: $INPUT Center freq: $((($INPUT * 5) + 2407)) MHz Recommended: No"
fi
fi
# 5 GHz
if [[ " ${ALL_5_CHANNELS[*]} " =~ " ${INPUT} " ]]; then
BAND="5"
CTF_5_OUTPUT="Band: $BAND GHz Channel: $INPUT Center freq: $((($INPUT * 5) + 5000)) MHz"
if [[ " ${UNII_1_CHANNELS[*]} " =~ " ${INPUT} " ]]; then
CTF_5_OUTPUT="$CTF_5_OUTPUT U-NII-1"
elif [[ " ${UNII_2A_CHANNELS[*]} " =~ " ${INPUT} " ]]; then
CTF_5_OUTPUT="$CTF_5_OUTPUT U-NII-2A"
elif [[ " ${UNII_2C_CHANNELS[*]} " =~ " ${INPUT} " ]]; then
CTF_5_OUTPUT="$CTF_5_OUTPUT U-NII-2C"
elif [[ " ${UNII_3_CHANNELS[*]} " =~ " ${INPUT} " ]]; then
CTF_5_OUTPUT="$CTF_5_OUTPUT U-NII-3"
fi
echo "$CTF_5_OUTPUT"
fi
# 6 GHz
# Indicate lower or upper 6 GHz to illustrate difference between countries using 500 MHz and 1200 MHz
if [ "$INPUT" -le 93 ]; then
LOWER_UPPER="Lower 6 GHz"
else
LOWER_UPPER="Upper 6 GHz"
fi
# 6 GHz PSC channel
if [ "$INPUT" -ge 1 ] && [ "$INPUT" -le 233 ] && [ $(($INPUT%4)) -eq 1 ] && [ $(($INPUT%16)) -eq 5 ]; then
BAND="6"
echo "Band: $BAND GHz Channel: $INPUT Center freq: $((($INPUT * 5) + 5950)) MHz PSC: Yes $LOWER_UPPER"
# 6 GHz non-PSC channel
elif [ "$INPUT" -ge 1 ] && [ "$INPUT" -le 233 ] && [ $(($INPUT%4)) -eq 1 ]; then
BAND="6"
echo "Band: $BAND GHz Channel: $INPUT Center freq: $((($INPUT * 5) + 5950)) MHz PSC: No $LOWER_UPPER"
fi
invalid_input
}
#-------------
# Main logic
#-------------
# Process options and filter invalid input out
case $INPUT in
-h | --help | '') usage ;;
-v | --version) version ;;
-2.4 | -2) show_all_2_4 ;;
-5) show_all_5 ;;
-6) show_all_6 ;;
*[!0-9]*) invalid_input ;;
esac
# Convert channel to frequency or vice versa
if [ "$INPUT" -ge 2412 ]; then
freq_to_channel
else
channel_to_freq
fi