46 lines
1.3 KiB
Bash
46 lines
1.3 KiB
Bash
#!/bin/bash
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LC_ALL=C
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if [ -e "/proc/device-tree/ibm,partition-uuid" ] ; then
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UUID=$(tr -d '\0' < /proc/device-tree/ibm,partition-uuid)
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else
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UUID=$(dmidecode -s system-uuid | tr -d '[:space:]')
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fi
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if [ -z "$UUID" ] ; then
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>&2 echo "No UUID found, can't determine hostnqn."
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exit 1
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fi
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# convert UUID to lower-case only:
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UUID=$(echo $UUID | tr '[:upper:]' '[:lower:]')
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# check UUID format, e.g.: 4c4c4544-0156-4a10-8134-b7d04f383232, so: 8-4-4-4-12
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if ! [[ $UUID =~ ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ ]] ; then
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>&2 echo "UUID has invalid format."
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>&2 echo "Invalid UUID: ${UUID}"
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exit 2
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fi
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# HEURISTIC:
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# (1) if any one given character occurs more than 50% of the time, it is likely
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# that the UUID is fake.
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# (2) if the first or the last group consists of mostly the same character, it
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# is likely that the UUID is fake.
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FIRST_GROUP="$(echo $UUID | cut -d'-' -f1)"
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LAST_GROUP="$(echo $UUID | cut -d'-' -f5)"
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for i in {{0..9},{a..f}} ; do
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COUNT_TOTAL="${UUID//[^$i]}"
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COUNT_FIRST="${FIRST_GROUP//[^$i]}"
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COUNT_LAST="${LAST_GROUP//[^$i]}"
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if [ ${#COUNT_TOTAL} -ge 16 ] || [ ${#COUNT_FIRST} -ge 7 ] || [ ${#COUNT_LAST} -ge 11 ] ; then
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>&2 echo "UUID is too repetitive. This may be a false alert."
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>&2 echo "Repetitive UUID: ${UUID}"
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exit 3
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fi
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done
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HOSTNQN="nqn.2014-08.org.nvmexpress:uuid:${UUID}"
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echo $HOSTNQN
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