#!/usr/bin/env bash

tmp_err_msg=$(mktemp)

# -------------
# --- Some functions
# -------------
clean_up() {

   # Perform program exit housekeeping
   rm -f $tmp_err_msg
   exit $1
}

echononl(){
   echo X\\c > /tmp/shprompt$$
   if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
      echo -e -n "$*\\c" 1>&2
   else
       echo -e -n "$*" 1>&2
   fi
   rm /tmp/shprompt$$
}

fatal(){
   echo ""
   echo -e "fatal error: $*"
   echo ""
   echo -e "\t\033[31m\033[1mInstalllation will be interrupted\033[m\033[m"
   echo ""
   exit 1
}

error(){
   echo ""
   echo -e "\t[ \033[31m\033[1mFehler\033[m ]: $*"
   echo ""
}

warn (){
   echo ""
   echo -e "\t[ \033[33m\033[1mWarning\033[m ]: $*"
   echo ""
}

info (){
   echo ""
   echo -e "\t[ \033[32m\033[1mInfo\033[m ]: $*"
   echo ""
}

echo_done() {
   echo -e "\033[80G[ \033[32mdone\033[m ]"
}
echo_ok() {
   echo -e "\033[80G[ \033[32mok\033[m ]"
}
echo_warning() {
   echo -e "\033[80G[ \033[33m\033[1mwarn\033[m ]"
}
echo_failed(){
   echo -e "\033[80G[ \033[1;31mfailed\033[m ]"
}
echo_skipped() {
   echo -e "\033[80G[ \033[33m\033[1mskipped\033[m ]"
}

echononl "   Create file \"greylist_client_access_pcre\""
if [[ ! -f /etc/postfix/greylist_client_access_pcre ]]; then
   cat <<EOF > /etc/postfix/greylist_client_access_pcre
# ---
# Check Client Access for greylisting (selective greylisting)
# ---
#
# - Note:
# -
# -    Action 'check_greylist' must be defined by 'smtpd_restriction_classes' 
# -    and also set with an action (check_policy_service inet:127.0.0.1:10023) 
# -    in file /etc/postfix/ main.cf.
# -
# -    Your main.cf may looks like:
# -
# -       smtpd_restriction_classes = check_greylist
# -       check_greylist = check_policy_service inet:127.0.0.1:10023
# -
# -       smtpd_recipient_restrictions =
# -          ...
# -          check_client_access pcre:/etc/postfix/greylist_client_access_pcre,
# -          ...
# -
# -       smtpd_relay_restrictions =
# -          ...
# -          check_client_access pcre:/etc/postfix/greylist_client_access_pcre,
# -          ...

# ---
# - For clients matching the following rules greylisting check is applied.
# ---

# unkown clients
/^unknown$/    check_greylist

# everything with 3 or more hyphens in the hostname
/(\\-.+){3}$/   check_greylist
# everything with 4 or more dots in the hostname
/(\\..+){4}$/   check_greylist

# dialups
/(^|[0-9.x_-])(abo|br(e|oa)dband|cabel|(hk)?cablep?|catv|cbl|cidr|d?client2?|cust(omer)?s?|dhcp|dial?(in|up)?|d[iu]p|[asx]?dsld?|dyn(a(dsl|mic)?)?|home|in-addr|modem(cable)?|(di)?pool|ppp|ptr|rev|static|user|YahooBB[0-9]{12}|c[[:alnum:]]{6,}(\\.[a-z]{3})?\\.virtua|[1-9]Cust[0-9]+|AC[A-Z][0-9A-F]{5}\\.ipt|pcp[0-9]{6,}pcs|S0106[[:alnum:]]{12,}\\.[a-z]{2})[0-9.x_-]/  check_greylist

EOF
   if [[ $? -eq 0 ]] ; then
      echo_ok
   else
      echo_failed
   fi
else
   echo_skipped
fi


clean_up 0