#!/bin/sh
# =====================================================================
#  Projet  : DARKWALL
#  Fichier : bin/ifdhcpexit.routeHelper
#  Auteur  : Nicolas "DarkHack" Chapuis (c) 2026
# ================== DARKHACK ==================
#        [ darkweb.fr  -  system online ]
#   Powered by Perplexity, your AI assistant
#       https://www.perplexity.ai
# ==============================================
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
# =====================================================================
LOG=/tmp/dhcp-routeHelper.log

log() {
  echo "$*" >> "$LOG"
}

run_ip() {
  log "+ $*"
  out="$("$@" 2>&1)"
  rc=$?
  log "rc=$rc out=$out"
  return "$rc"
}

log "===== $(date) ====="
log "ip -6 addr"
ip -6 addr >> "$LOG"
log "ip -6 route"
ip -6 route >> "$LOG"
log "ip -6 route show table local"
ip -6 route show table local >> "$LOG"

ipSrc="${new_ip_address}"
ipSrc="${ipSrc:-$( sh /etc/darksrv/firewall/bin/GetIpForIface ${interface} )}"
if [ -n "$interface" ] && [ -n "$new_routers" ] && [ -n "$ipSrc" ]; then
  IFS_SAVE=$IFS
  IFS=','
  set -- $new_routers
  IFS=$IFS_SAVE
  
  for new_router in "$@"; do
    if run_ip ip route get $new_router dev $interface;then
     if ! ip route show dev "$interface" | grep -q "default via $new_router"; then
       echo "try Add Route '$new_router' on '$interface' by '$ipSrc'" >> "$LOG"
       if run_ip ip route add default via "$new_router" dev "$interface" src ${ipSrc} scope global; then
         echo "route added $new_router by '$ipSrc'" >> "$LOG"
       elif run_ip ip route replace default via "$new_router" dev "$interface" src ${ipSrc} scope global; then
         echo "route replaced $new_router by $ipSrc" >> "$LOG"
       else
         if ! ip route show dev "$interface" | grep -q "^default "; then
           echo "!!!!!!! Fallback Route '$interface' (scope link)" >> "$LOG"
            run_ip ip route replace default dev "$interface" src ${ipSrc} scope link
         else
           echo "default already present, no fallback" >> "$LOG"
         fi
       fi
     fi
    else
     echo "Route not ready for '$new_router' on '$interface'" >> "$LOG"
    fi
  done
else
 echo "one of follow is empty: ipSrc:$ipSrc new_routers:$new_routers interface:$interface" >> "$LOG"
fi

log "after:"
ip -6 addr >> "$LOG"
ip -6 route >> "$LOG"
ip -6 route show table local >> "$LOG"