--[[ $%BEGINLICENSE%$
 Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License as
 published by the Free Software Foundation; version 2 of the
 License.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 02110-1301  USA

 $%ENDLICENSE%$ --]]

function packet_auth(fields)
	fields = fields or { }
	return "\010" ..             -- proto version
		(fields.version or "5.0.45-proxy") .. -- version
		"\000" ..             -- term-null
		"\001\000\000\000" .. -- thread-id
		"\065\065\065\065" ..
		"\065\065\065\065" .. -- challenge - part I
		"\000" ..             -- filler
		"\001\130" ..         -- server cap (long pass, 4.1 proto)
		"\008" ..             -- charset
		"\002\000" ..         -- status
		("\000"):rep(13) ..   -- filler
		"\065\065\065\065"..
		"\065\065\065\065"..
		"\065\065\065\065"..
		"\000"                -- challenge - part II
end

function connect_server()
	-- emulate a server
	proxy.response = {
		type = proxy.MYSQLD_PACKET_RAW,
		packets = {
			packet_auth()
		}
	}
	return proxy.PROXY_SEND_RESULT
end

function read_query(packet)
    if packet:byte() ~= proxy.COM_QUERY then
        proxy.response = {
		type = proxy.MYSQLD_PACKET_OK
	}
        return proxy.PROXY_SEND_RESULT
    end
    local query = packet:sub(2) 
    if query == 'SELECT 1, "ADDITION"' then
        proxy.queries:append(1, string.char(proxy.COM_QUERY) .. 'SELECT 1, "ADDITION", "SECOND ADDITION"')
	proxy.response = {
		type = proxy.MYSQLD_PACKET_OK,
		resultset = {
			fields = {
				{ name = '1' },
				{ name = 'ADDITION' },
				{ name = 'SECOND ADDITION' }
			},
			rows = {
				{ '1' , 'ADDITION' , 'SECOND ADDITION' }
			}
		}
	}
    else
        proxy.response = {
		type = proxy.MYSQLD_PACKET_ERR,
		errmsg = "(chain1a.lua) " .. query
	}
    end
    return proxy.PROXY_SEND_RESULT
end




