41 lines
870 B
Bash
41 lines
870 B
Bash
#!/bin/bash
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function _mask_ip_digit
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{
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if [[ ${1} -ge 8 ]]
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then
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MASK=255
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elif [[ ${1} -le 0 ]]
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then
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MASK=0
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else
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VALUES=(0 128 192 224 240 248 252 254 255)
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MASK=${VALUES[${1}]}
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fi
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local DVAL=${2}
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((DVAL&=MASK))
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echo "${DVAL}"
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}
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# Transforms a specific IP with CIDR suffix
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# like 1.2.3.4/16 to subnet with cidr suffix
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# like 1.2.0.0/16.
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# Assumes correct IP and subnet are provided.
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function _sanitize_ipv4_to_subnet_cidr
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{
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local DIGIT_PREFIX_LENGTH="${1#*/}"
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declare -a MASKED_DIGITS DIGITS
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IFS='.' ; read -r -a DIGITS < <(echo "${1%%/*}") ; unset IFS
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for ((i = 0 ; i < 4 ; i++))
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do
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MASKED_DIGITS[i]=$(_mask_ip_digit "${DIGIT_PREFIX_LENGTH}" "${DIGITS[i]}")
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DIGIT_PREFIX_LENGTH=$((DIGIT_PREFIX_LENGTH - 8))
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done
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echo "${MASKED_DIGITS[0]}.${MASKED_DIGITS[1]}.${MASKED_DIGITS[2]}.${MASKED_DIGITS[3]}/${1#*/}"
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}
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