33 lines
488 B
Bash
Executable File
33 lines
488 B
Bash
Executable File
#!/usr/bin/env bash
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# - Convert CIDR to netmask
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# -
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cidr2mask() {
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local i mask=""
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local full_octets=$(($1/8))
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local partial_octet=$(($1%8))
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for ((i=0;i<4;i+=1)); do
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if [ $i -lt $full_octets ]; then
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mask+=255
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elif [ $i -eq $full_octets ]; then
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mask+=$((256 - 2**(8-$partial_octet)))
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else
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mask+=0
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fi
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test $i -lt 3 && mask+=.
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done
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echo $mask
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}
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cidr=$1
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mask=$(cidr2mask $cidr)
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echo ""
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echo "cidr: $cidr - mask: $mask"
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echo ""
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exit 0
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