forked from freifunk-franken/firmware
98 lines
2.2 KiB
Plaintext
98 lines
2.2 KiB
Plaintext
# Copyright 2017 Adrian Schmutzler
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# License GPLv3
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ipMacSuffix() {
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# Returns the lower 64 bits of an IPv6 address (0:aabb:ccdd:eeff)
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# based on the provided MAC address (aa:bb:cc:bb:ee:ff)
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#
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# Argument: MAC address (with colons)
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[ $# -ne "1" ] && return 1
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local mac=$1
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echo "$mac" | awk -F: '{ print "0:"$1$2":"$3$4":"$5$6 }'
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return 0
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}
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ipEUISuffix() {
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# Returns the EUI (interface ID, a8bb:ccff:fedd:eeff)
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# based on the provided MAC address (aa:bb:cc:bb:ee:ff)
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#
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# Argument: MAC address (with colons)
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[ $# -ne "1" ] && return 1
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local mac=$1
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echo "$mac" | awk -F: '{ printf("%02x%s:%sff:fe%s:%s%s\n", xor(("0x"$1),2), $2, $3, $4, $5, $6) }'
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return 0
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}
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ipAssemble() {
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# Concatenates a prefix (1st argument) and a suffix (2nd argument) to a merged IPv6 address
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# (The prefix has to bear the subnet: fdff::/64)
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# (The prefix must only contain the higher 64 bits (correct: 0:0:0:0: or 0:: - wrong: 0:0:0:0::)
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[ $# -ne "2" ] && return 1
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local prefix=$1
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local suffix=$2
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echo "$prefix" | sed -e 's,/,'$suffix'/,'
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return 0
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}
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ipMacAssemble() {
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# Concatenates a prefix (1st argument) and a MAC-based suffix (MAC address as 2nd argument) to a merged IPv6 address
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# (Details on prefix: Check ipAssemble(), details on suffix: Check ipMacSuffix())
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[ $# -ne "2" ] && return 1
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local prefix=$1
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local mac=$2
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suffix="$(ipMacSuffix "$mac")"
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ipAssemble "$prefix" "$suffix"
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return 0
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}
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ipEUIAssemble() {
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# Concatenates a prefix (1st argument) and an EUI-based suffix (MAC address as 2nd argument) to a merged IPv6 address
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# (Details on prefix: Check ipAssemble(), details on suffix: Check ipEUISuffix())
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[ $# -ne "2" ] && return 1
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local prefix=$1
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local mac=$2
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suffix="$(ipEUISuffix "$mac")"
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ipAssemble "$prefix" "$suffix"
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return 0
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}
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ipTidyColon() {
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# Collapses zeros to :: to yield short but valid IPv6 addresses
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#
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# Argument: IPv6 address to be shortened
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[ $# -ne "1" ] && return 1
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local addr=$1
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echo "$addr" | grep -q "::" || addr="$(echo "$addr" | sed -e 's,:[0:]*:,::,')"
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echo "$addr"
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return 0
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}
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macFlipLocalBit() {
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# Returns given MAC-address with locally administered bit flipped
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#
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# Argument: MAC-address
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local mac=$1
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echo "$mac" | awk -F: '{ printf("%02x:%s:%s:%s:%s:%s\n", xor(("0x"$1),2), $2, $3, $4, $5, $6) }'
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return 0
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}
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