mirror of
https://github.com/tonusoo/koduinternet-cpe
synced 2024-11-28 22:11:00 +02:00
76 lines
1.7 KiB
Plaintext
76 lines
1.7 KiB
Plaintext
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#!/usr/bin/env bash
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# Title : mcast_converter
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# Last modified date : 12.04.2023
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# Author : Martin Tonusoo
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# Description : Script converts IPv4 multicast address to
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# multicast MAC address or multicast MAC
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# address to IPv4 multicast addresses depending
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# on the input.
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# Options : IPv4 multicast address or multicast MAC address.
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# Notes :
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# 224.0.0.0 - 239.255.255.255
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read -r mip_regex << EOF
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^2(2[4-9]|3[0-9])\.\
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(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)\.\
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(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)\.\
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(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)$
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EOF
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# 01:00:5e:00:00:00 - 01:00:5e:7f:ff:ff
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read -r mac_regex << EOF
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^01:00:5e:\
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([0-7][0-9a-f]):\
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([0-9a-f]{2}):\
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([0-9a-f]{2})$
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EOF
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if [[ "$1" =~ $mip_regex ]]; then
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for (( n="${BASH_REMATCH[2]}"; n>0; n >>= 1 )); do
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o2_bits="$(( n & 1 ))$o2_bits"
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done
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printf -v o2_bits "%08d" "$o2_bits"
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o2_bits="0${o2_bits:1}"
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printf "%s:%02x:%02x:%02x\n" \
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"01:00:5e" \
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"$(( 2#$o2_bits ))" \
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"${BASH_REMATCH[3]}" \
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"${BASH_REMATCH[4]}"
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elif [[ "$1" =~ $mac_regex ]]; then
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o4_dec=$(( 16#"${BASH_REMATCH[1]}" ))
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for (( n="$o4_dec"; n>0; n >>= 1 )); do
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o4_bits="$(( n & 1 ))$o4_bits"
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done
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printf -v o4_bits "%08d" "$o4_bits"
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o4_bits="${o4_bits:1}"
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for bits in {0..1}{0..1}{0..1}{0..1}{0..1}; do
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printf "%d.%d.%d.%d\n" \
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$(( 2#"1110${bits:0:4}" )) \
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$(( 2#"${bits:4:1}$o4_bits" )) \
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$(( 16#"${BASH_REMATCH[2]}" )) \
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$(( 16#"${BASH_REMATCH[3]}" ))
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done
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else
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printf "%s\n%s\n" \
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"Invalid multicast MAC or IPv4 address" \
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"Examples: '${0##*/} 01:00:5e:00:99:0a' or '${0##*/} 239.1.2.100'" >&2
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exit 1
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fi
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