#!/bin/bash
intf=$1
port=$2
if [ -z "${intf}" ]; then
    intf="eth0"
fi
if [ -z "${port}" ]; then
    port="3306"
fi

tcpdump -i ${intf} -s 0 -l -w - dst port ${port} | strings | perl -e '
while(<>) { chomp; next if /^[^ ]+[ ]*$/;
    if(/^(SELECT|UPDATE|DELETE|INSERT|SET|COMMIT|ROLLBACK|CREATE|DROP|ALTER|CALL)/i)
    {
        if (defined $q) { print "$q\n"; }
        $q=$_;
    } else {
        $_ =~ s/^[ \t]+//; $q.=" $_";
    }
}'