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authorDaniel Baumann <daniel.baumann@progress-linux.org>2021-07-02 20:40:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2021-07-02 20:40:30 +0000
commitdc597ce8df5ae6efd2728a2d7ba7d92486028f79 (patch)
tree55b9e9257eba4579667f9522368aa29f5be6754a /scripts/gen-hostnqn.sh
parentInitial commit. (diff)
downloadnvme-cli-dc597ce8df5ae6efd2728a2d7ba7d92486028f79.tar.xz
nvme-cli-dc597ce8df5ae6efd2728a2d7ba7d92486028f79.zip
Adding upstream version 1.12.upstream/1.12
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'scripts/gen-hostnqn.sh')
-rw-r--r--scripts/gen-hostnqn.sh42
1 files changed, 42 insertions, 0 deletions
diff --git a/scripts/gen-hostnqn.sh b/scripts/gen-hostnqn.sh
new file mode 100644
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--- /dev/null
+++ b/scripts/gen-hostnqn.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+LC_ALL=C
+
+UUID=$(dmidecode -s system-uuid | tr -d '[:space:]')
+
+if [ -z "$UUID" ] ; then
+ >&2 echo "No UUID found, can't determine hostnqn."
+ exit 1
+fi
+
+# convert UUID to lower-case only:
+UUID=$(echo $UUID | tr '[:upper:]' '[:lower:]')
+
+# check UUID format, e.g.: 4c4c4544-0156-4a10-8134-b7d04f383232, so: 8-4-4-4-12
+if ! [[ $UUID =~ ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$ ]] ; then
+ >&2 echo "UUID has invalid format."
+ >&2 echo "Invalid UUID: ${UUID}"
+ exit 2
+fi
+
+# HEURISTIC:
+# (1) if any one given character occurs more than 50% of the time, it is likely
+# that the UUID is fake.
+# (2) if the first or the last group consists of mostly the same character, it
+# is likely that the UUID is fake.
+FIRST_GROUP="$(echo $UUID | cut -d'-' -f1)"
+LAST_GROUP="$(echo $UUID | cut -d'-' -f5)"
+for i in {{0..9},{a..f}} ; do
+ COUNT_TOTAL="${UUID//[^$i]}"
+ COUNT_FIRST="${FIRST_GROUP//[^$i]}"
+ COUNT_LAST="${LAST_GROUP//[^$i]}"
+ if [ ${#COUNT_TOTAL} -ge 16 ] || [ ${#COUNT_FIRST} -ge 7 ] || [ ${#COUNT_LAST} -ge 11 ] ; then
+ >&2 echo "UUID is too repetitive. This may be a false alert."
+ >&2 echo "Repetitive UUID: ${UUID}"
+ exit 3
+ fi
+done
+
+HOSTNQN="nqn.2014-08.org.nvmexpress:uuid:${UUID}"
+
+echo $HOSTNQN