#----------------------------------------------------------------------------
# /www/srv/admin/cgi-helper-ip4
#
# Creation:     2013-11-07 LanSezi
# Last Update:  $Id$
#----------------------------------------------------------------------------

cgi_helper_ip4="yes"

#----------------------------------------------------------------------------
# check a given adress for correct ipv4 ranges 
#----------------------------------------------------------------------------
ip4_isvalidaddr ()
{
    local ipcheck=$(netcalc canonicalize $1)
    return $?
}
#----------------------------------------------------------------------------
# remove leading zeros from ipv4 adress
#----------------------------------------------------------------------------
ip4_normalize ()
{
    
    local ipnorm=$(netcalc canonicalize $1)
    res=${ipnorm%%/*}
}

#----------------------------------------------------------------------------
# check a ipv4 is in a range between or is same as start- and end-adress
#----------------------------------------------------------------------------
ip4_isindhcprange ()
{
    isinrange=0
    ip4_normalize $1
    local addr=$res
    ip4_normalize $2
    local start=$res
    ip4_normalize $3
    local end=$res
    if [ "$addr" == "$start" -o "$addr" == "$end" ]
    then
        return 0
    else
        if [ "` echo -e "${addr}addr\n${start}\n${end}" | sort -t . -k 1,1n -k 2,2n -k 3,3n -k 4,4n | grep -n addr`" == "2:${addr}addr" ]
        then
            return 0
        else
            return 1
        fi
    fi
}