my_get_error_page.sh

#!/bin/sh

######### for test
# SGERROR_FILE="/home/mario.q/myScripts/sgerror.php"
# MY_GET_ERROR_PAGE="/home/mario.q/myScripts/personalSgerror.php"
#########
######### real file on pfsense
SGERROR_FILE="/usr/local/www/sgerror.php"
MY_GET_ERROR_PAGE="/home/mario.q/myScripts/my_get_error_page.php"
#########

########################################
########################################
#
# da qui in poi non dovresti modificare niente
# from here on you should not change anything
#
########################################
########################################

PFS="`cat /etc/platform`"
if [ "$PFS" != "pfSense" ]; then
    echo "This script work on pfSense"
    exit 101
fi

if [ ! -w "$SGERROR_FILE" -o ! -r "$MY_GET_ERROR_PAGE" ]; then
    echo "####"

    if [ ! -w "$SGERROR_FILE" ]; then
        # CK_SGERROR_FILE="`ls -lh "$SGERROR_FILE" 2>&1`"
        CK_SGERROR_FILE="`stat -x "$SGERROR_FILE" 2>&1 |\
                        sed 's/:[[:space:]]\{1,100\}/:/g ;\
                            /Device/,/Change/d ;\
                            /Size/d ;\
                            s/[[:space:]]\{2,100\}/ /g'`"

        echo -e "You cannot edit the file in var SGERROR_FILE=\"$SGERROR_FILE\"\n$CK_SGERROR_FILE"
    else
        echo -e " SGERROR_FILE=\"$SGERROR_FILE\"\n    OK"
    fi
    echo " ####"
    if [ ! -r "$MY_GET_ERROR_PAGE" ]; then
        CK_MY_GET_ERROR_PAGE="`ls -lh "$MY_GET_ERROR_PAGE" 2>&1`"
        echo -e " MY_GET_ERROR_PAGE=\"$MY_GET_ERROR_PAGE\"\n $CK_MY_GET_ERROR_PAGE\n    The file exist ?? you can read it ??"
    else
        echo -e " MY_GET_ERROR_PAGE=\"$MY_GET_ERROR_PAGE\"\n    OK"
    fi
    echo "####"
    exit 1
fi

FUNCTION_ORIGINAL="function get_error_page("
FUNCTION_RENAMED="function NO_get_error_page_NO("
BLOCK_START="start - this include replace the original function ---------"
BLOCK_END="end   - this include replace the original function ---------"
SGERROR_TMP="`cat $SGERROR_FILE`"
ERROR=0

case $1 in
install|i)
    if [ "`echo "$SGERROR_TMP" | grep "$FUNCTION_ORIGINAL"`" ]; then
        echo "$SGERROR_TMP" |\
        sed "s/`echo "$FUNCTION_ORIGINAL"`/`echo "$FUNCTION_RENAMED"`/" |\
        sed "/`echo "$FUNCTION_RENAMED"`/ i \\
`echo "// $BLOCK_START"`\\
`echo "// modified by \\"$(readlink -f $0)\\""`\\
`echo "include \\"$MY_GET_ERROR_PAGE\\";"`\\
`echo "// $BLOCK_END"`\\
" >$SGERROR_FILE
        echo "#### OK"
    else
        echo -e "####\n \"$FUNCTION_ORIGINAL...\"\n  Function to replace not found"
        ERROR=15
        if [ "`echo "$SGERROR_TMP" | grep "include \\"$MY_GET_ERROR_PAGE\\";"`" ]; then
            echo -e " Your personal function is active.\n  include \"$MY_GET_ERROR_PAGE\";"
        ERROR=0
        fi
        echo "####"
    fi
;;
uninstall|u)
    if [ "`echo "$SGERROR_TMP" | grep "$BLOCK_START"`" -a \
    "`echo "$SGERROR_TMP" | grep "include \\"$MY_GET_ERROR_PAGE\\";"`" -a \
    "`echo "$SGERROR_TMP" | grep "$BLOCK_END"`" ]; then
        echo "$SGERROR_TMP" |\
        sed "/`echo "$BLOCK_START"`/,/`echo "$BLOCK_END"`/d" |\
        sed "s/`echo "$FUNCTION_RENAMED"`/`echo "$FUNCTION_ORIGINAL"`/" >$SGERROR_FILE
        echo "#### OK"
    else
        echo -e "####\nnot found\n // $BLOCK_START\n include \"$MY_GET_ERROR_PAGE\";\n // $BLOCK_END"
        ERROR=20

        if [ "`echo "$SGERROR_TMP" | grep "$FUNCTION_ORIGINAL"`" ]; then
            echo -e " ####\n the function for the error page is \"$FUNCTION_ORIGINAL...\""
        else
            echo -e " Not found \"$FUNCTION_ORIGINAL...\"\n not found include \"$MY_GET_ERROR_PAGE\";"
            echo " ? ?? ???? ?????? ????????"
            ERROR=100
        fi
        echo "####"
    fi
;;
*)
    cat <<USE_H
####
  $0 [i|install] [u|uninstall]
####
  `basename $0` i|install
    Edit the file "$SGERROR_FILE"
    Rename the function "$FUNCTION_ORIGINAL..."
    and replaces it with the file "$MY_GET_ERROR_PAGE"

 ####
  `basename $0` u|uninstall
    Removes the changes to the file "$SGERROR_FILE"
    and restores the original function "$FUNCTION_ORIGINAL..."
####
USE_H
    ERROR=1
;;
esac
exit $ERROR