#!/bin/bash

# Vérifier si ces valeurs existent dans smb.conf
# idmap config REALM:range = min-max
rangeMin=100000
rangeMax=999999

sam=/var/lib/samba/private/sam.ldb

createTmpDir() {
  tmpDir=$(mktemp -d --tmpdir addGid.XXXXXX) || exit 1
  tmpRecord=$tmpDir/record_
  tmpLdif=$tmpDir/ldif
}
cleanTmpDir() {
  rm $tmpDir/*
}
removeTmpDir() {
  rm -r $tmpDir
}
                                                                                                                                                                                              
findMaxId() {                                                                                                                                                                                 
  ldbsearch -H $sam "$regexp" $field | sed '/^# Referral/ { :loop; N; $! b loop; d; }; s/^\([a-zA-Z0-9]*\): \(.*\)$/\1="\2"/g; /^$/d;' | awk '/^# record/{n++}{print > f n}' f=$tmpRecord     
                                                                                                                                                                                              
  maxID=$rangeMin                                                                                                                                                                             
  for file in `grep -l -E "^$field=" ${tmpRecord}*`                                                                                                                                           
  do                                                                                                                                                                                          
    source $file                                                                                                                                                                              
    if [ ${!field} -gt $rangeMax ]
    then
      echo "Warning: $field ${!field} for $dn is bigger than max id $rangeMax" 1>&2
    elif [ ${!field} -lt $rangeMin ]
    then
      echo "Warning: $field ${!field} for $dn is lower than min id $rangeMin" 1>&2
    else
      [ ${!field} -gt $maxID ] && maxID=${!field}
    fi
  done

  echo "Max ID found for $field: $maxID"
}

addIdNumber() {
  for file in `grep -L -E "^$field=" ${tmpRecord}*`
  do
    ((maxID++))
    source $file
    echo "Adding $field: $maxID for dn: $dn"
    echo "dn: $dn
changetype: modify
add: $field
$field: $maxID" > $tmpLdif
    ldbmodify -H $sam $tmpLdif
  done
}

umask 0077
createTmpDir

field=uidNumber
regexp="(&(objectclass=user)(!(objectclass=computer)))"
findMaxId
addIdNumber
cleanTmpDir

field=gidNumber
regexp="(objectclass=group)"
findMaxId
addIdNumber
cleanTmpDir

removeTmpDir

exit 0