From e70949f6ecc25220f057579bb636d117c61145c4 Mon Sep 17 00:00:00 2001
From: Christoph <ckubu@oopen.de>
Date: Tue, 7 May 2024 13:41:32 +0200
Subject: [PATCH] Add suport for sender domain rewriting.

---
 install_postfix_base.sh | 54 ++++++++++++++++++++++++++++++++++++++---
 1 file changed, 50 insertions(+), 4 deletions(-)

diff --git a/install_postfix_base.sh b/install_postfix_base.sh
index 1334e2b..2db2531 100755
--- a/install_postfix_base.sh
+++ b/install_postfix_base.sh
@@ -84,6 +84,14 @@ blank_line() {
    fi
 }
 
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+
 detect_os_1 () {
 
    if $(which lsb_release > /dev/null 2>&1) ; then
@@ -122,6 +130,7 @@ detect_os_1 () {
 DEFAULT_ADMIN_EMAIL="argus@oopen.de"
 DEFAULT_RELAY_HOST="b.mx.oopen.de"
 DEFAULT_SASL_AUTH=false
+DEFAULT_REWRITE_SENDER_DOMAIN=None
 
 
 # - Is this a systemd system?
@@ -338,6 +347,9 @@ if [[ "$SASL_AUTH" = "yes" ]] || $SASL_AUTH ; then
    [[ -z "$_RELAY_HOST" ]] && _RELAY_HOST="$DEFAULT_RELAY_HOST"
 fi
 
+if [[ -z ${_REWRITE_SENDER_DOMAIN} ]] ; then
+   _REWRITE_SENDER_DOMAIN="${DEFAULT_REWRITE_SENDER_DOMAIN}"
+fi
 
 
 if [[ "$SASL_AUTH" = "yes" ]] || $SASL_AUTH ; then
@@ -403,12 +415,37 @@ if [[ "$SASL_AUTH" = "yes" ]] || $SASL_AUTH ; then
       done
    fi
 
-
-
 else
    SASL_AUTH=false
 fi
 
+REWRITE_SENDER_DOMAIN=
+echo ""
+echo ""
+echo -e "\033[33m** \033[32m-- \033[33m**\033[m"
+echo ""
+echo "Change the sender domain"
+echo ""
+echo -e "\t'\033[33mNone\033[m' if no change is desired"
+echo ""
+if [[ -n "${_REWRITE_SENDER_DOMAIN}" ]] ; then
+   echononl "New sender domain [${_REWRITE_SENDER_DOMAIN}]: "
+   read REWRITE_SENDER_DOMAIN
+   if [[ "X${REWRITE_SENDER_DOMAIN}" = "X" ]]; then
+      REWRITE_SENDER_DOMAIN="${_REWRITE_SENDER_DOMAIN}"
+   fi
+else
+   while [[ "X${IPV6}" = "X" ]]; do
+      echononl "New sender domain: "
+      read REWRITE_SENDER_DOMAIN
+      if [[ "X${REWRITE_SENDER_DOMAIN}" = "X" ]]; then
+         REWRITE_SENDER_DOMAIN="None"
+      fi
+   done
+fi
+
+echo ""
+echo -e "\033[33m** \033[32m-- \033[33m**\033[m"
 
 echo ""
 echo ""
@@ -419,6 +456,12 @@ echo -e "\tIPv4 address.............: $IPV4"
 echo -e "\tIPv6 address.............: $IPV6"
 echo -e "\tAdmin e-mail.............: $ADMIN_EMAIL"
 echo ""
+if [[ "$(trim ${REWRITE_SENDER_DOMAIN,,})" = 'none' ]] ; then
+   echo -e "\trewrite sender domain....: \033[33mNone\033[m"
+else
+   echo -e "\trewrite sender domain....: $REWRITE_SENDER_DOMAIN"
+fi
+echo ""
 echo -e "\tRelay using sasl auth....: $SASL_AUTH"
 if $SASL_AUTH ; then
    echo -e "\t   sasl user.............: $SASL_USER"
@@ -455,6 +498,7 @@ _SASL_AUTH=$SASL_AUTH
 _SASL_USER=$SASL_USER
 _SASL_PASS=$SASL_PASS
 _RELAY_HOST=$RELAY_HOST
+_REWRITE_SENDER_DOMAIN=$REWRITE_SENDER_DOMAIN
 EOF
 if [[ $? -eq 0 ]] ; then
    echo_ok
@@ -1231,9 +1275,11 @@ else
 fi
 
 echononl "   Create file \"generic\""
-if [[ ! -f /etc/postfix/generic ]]; then
+if [[ "$(trim ${REWRITE_SENDER_DOMAIN,,})" = 'none' ]] ; then
+   touch /etc/postfix/generic
+else
    cat <<EOF > /etc/postfix/generic
-@localhost  @$(hostname -f)
+@$(cat cat /etc/mailname) $(hostname)@$(trim ${REWRITE_SENDER_DOMAIN,,})
 EOF
 fi
 postmap btree:/etc/postfix/generic