mirror of
https://github.com/xcat2/xcat-core.git
synced 2025-11-03 21:02:34 +00:00
0f2d1aa0ca
git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@8616 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
36 lines
1.5 KiB
Bash
36 lines
1.5 KiB
Bash
#!/bin/bash
|
|
# This script will generate an IPv6 ULA. In IPv6, you know longer get to pick your favorite private network network and go for it,
|
|
# you must accept a psuedorandom /48 out of the fd::/8 space. This script will generate a /48 for either deploying an isolated
|
|
# ipv6 network that will almost certainly not conflict with present and future upstream ipv6 networks or just getting your feet wet
|
|
# with ipv6
|
|
|
|
# Implements RFC5193, section 3.2.2, with precision only down to nanoseconds at best (normalized by date output
|
|
SECSDOTNANO=$(date +%s.%N|sed -e 's/\.0*/\./')
|
|
|
|
NANOSECONDS=${SECSDOTNANO#*.}
|
|
#Convert from nanoseconds to ntp fractional seconds (I'll call them ticks for convenience)
|
|
# ns * 2**32 ticks/second * 1/1000000000 ns/s = ticks
|
|
NTPTICKS=$(( ($NANOSECONDS<<32) /1000000000))
|
|
|
|
EPOCHDELTA=2208988800
|
|
SECONDS=${SECSDOTNANO%.*}
|
|
SECONDS=$(($SECONDS+$EPOCHDELTA))
|
|
TIMESTAMP=$(printf "%08X:%08X" $SECONDS $NTPTICKS)
|
|
|
|
|
|
#next, get a mac address and convert to eui64
|
|
EUIPAD="FF:FE"
|
|
MAC=$(/sbin/ifconfig|grep HWaddr|grep -v usb|grep -v 00:00:00:00:00:00|head -n 1|awk '{print $NF}')
|
|
FIRSTBYTE=${MAC%%:*}
|
|
FIRSTBYTE=$(printf %02X $((0x$FIRSTBYTE|2)))
|
|
OTHERMANUF=${MAC%%:??:??:??}
|
|
OTHERMANUF=${OTHERMANUF#??:}
|
|
LOWMAC=${MAC#??:??:??:}
|
|
EUI=$FIRSTBYTE:$OTHERMANUF:$EUIPAD:$LOWMAC
|
|
|
|
#now, to do the SHA, spec doesn't say much about encoding, so we'll just slap the data together the laziest way
|
|
|
|
PREFIX="fd"$(echo $TIMESTAMP:$EUI|sha1sum|awk '{print $1}'|cut -c 31-)
|
|
PREFIX=$(echo $PREFIX|sed -e 's/\(....\)/\1:/g')
|
|
echo $PREFIX:/48
|