udhcpc.user

#!/bin/sh
# This callback is activated on dhcp events from wan interface

for file in /etc/sudomesh/*; do
  depends="$depends $file"
done

for file in $depends; do
  if [ -f "$file" ] 
  then
    . "$file"
  else
    logger "$file does not exist. meshrouting depends on it"
    exit 2
  fi
done


ip_calc=$(ipcalc.sh "$ip" "$subnet")
cidr_prefix=$(echo "$ip_calc" | grep -o 'PREFIX=\([0-9]\+\)' | sed -n -e 's/PREFIX=//p');
network=$(echo "$ip_calc" | grep -o 'NETWORK=\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+\)' | sed -n -e 's/NETWORK=//p');

clear_rules() {
  ip rule del from "$network"/"$cidr_prefix" prio 13000 table main
  ip rule del to "$network"/"$cidr_prefix" prio 13000 table main
}

setup_rules() {
  # To keep from continuously adding the same rule, we delete first
  clear_rules
  ip rule add from "$network"/"$cidr_prefix" prio 13000 table main
  ip rule add to "$network"/"$cidr_prefix" prio 13000 table main

  ip route flush cache
}


check_mesh_routes() {
  local try_count=0
  local try_max=400
  local try_sleep=5
  local try_restart_interval=20

  while [ "$try_count" -lt "$try_max" ]; do
    # extract gateway ip from babeld managed routing table "public"
    local exitnode_mesh_ip=$(ip route show table public | grep $TUN | grep via | awk -F ' ' '{print $3
}' | uniq | head -n1)
    if [ -n "$exitnode_mesh_ip" ]; then  
      logger "found a mesh route to [$exitnode_mesh_ip] via [$TUN]."
      break
    fi
    try_count=`expr $try_count + 1`

    # restart every once in a while
    if [ `expr $try_count % $try_restart_interval` -eq 0 ]; then
      logger "no mesh routes available yet via [$TUN] on try [$try_count]: restarting meshrouting..."    
      /etc/init.d/meshrouting restart
    else 
      logger "no mesh routes available yet via [$TUN] on try [$try_count]: checking again in [$try_sleep]s..."    
      sleep $try_sleep
    fi
  done
}

case "$1" in
  deconfig)
    clear_rules
  ;;
  renew|bound)
    setup_rules
    check_mesh_routes
  ;;
esac