#/usr/bin/env bash

# You no longer need Windows for aquiring DCs GUID
IFS='
'

convertToHex() {
  # Inspired by https://docs.microsoft.com/en-us/troubleshoot/windows-server/admin-development/convert-string-guid-to-hexadecimal-string
  RAW="$1"
  GUID=$(echo "$RAW" | sed 's/\-//g')

  HEX="${GUID:6:2}"
  HEX="${HEX}${GUID:4:2}"
  HEX="${HEX}${GUID:2:2}"
  HEX="${HEX}${GUID:0:2}"
  HEX="${HEX}${GUID:10:2}"
  HEX="${HEX}${GUID:8:2}"
  HEX="${HEX}${GUID:14:2}"
  HEX="${HEX}${GUID:12:2}"
  len=${#HEX}
  HEX="${HEX}${GUID:16:${len}}"

  echo "$HEX"
}


# apt install ldb-tools
realm=$(grep -i realm /etc/samba/smb.conf | awk '{print $3}' | tr '[:upper:]' '[:lower:]')
dc=$(echo $realm | awk -F '.' '{for(i = 1; i <= NF; i++) {printf ",DC=" $i}}')
base="OU=Domain Controllers${dc}"
cn=$1
GUID=$(ldbsearch  -H /var/lib/samba/private/sam.ldb --basedn="$base" "CN=${cn}" objectGUID \
  | grep '^objectGUID:' \
  | awk '{print $2}' \
)
convertToHex "$GUID"