static int lua_proto_append_response_packet (lua_State *L) {
GString *packet;
network_mysqld_auth_response *auth_response;
gboolean needs_auto_capabilities = TRUE;
guint32 server_capabilities;
luaL_checktype(L, 1, LUA_TTABLE);
/* extract the server_capabilities first as we need them to create the struct */
lua_getfield_literal(L, -1, C("server_capabilities"));
if (lua_isnil(L, -1)) {
return luaL_error(L, ".server_capabilities has to be set");
} else if (lua_isnumber(L, -1)) {
server_capabilities = lua_tointeger(L, -1);
} else {
return luaL_error(L, ".server_capabilities has to be a number");
}
lua_pop(L, 1);
packet = g_string_new(NULL);
auth_response = network_mysqld_auth_response_new(server_capabilities);
lua_getfield_literal(L, -1, C("capabilities"));
if (!lua_isnil(L, -1)) {
auth_response->client_capabilities = lua_tointeger(L, -1);
needs_auto_capabilities = FALSE;
}
lua_pop(L, 1);
LUA_IMPORT_INT(auth_response, max_packet_size);
LUA_IMPORT_INT(auth_response, charset);
LUA_IMPORT_STR(auth_response, username);
LUA_IMPORT_STR_FROM(auth_response, auth_plugin_data, "response");
LUA_IMPORT_STR(auth_response, auth_plugin_name);
LUA_IMPORT_STR(auth_response, database);
if (network_mysqld_proto_append_auth_response(packet, auth_response)) {
network_mysqld_auth_response_free(auth_response);
g_string_free(packet, TRUE);
luaL_error(L, "to_response_packet() failed");
g_string_free(packet, TRUE);
return 0;
}
network_mysqld_auth_response_free(auth_response);
lua_pushlstring(L, S(packet));
g_string_free(packet, TRUE);
return 1;
}
static network_mysqld_lua_stmt_ret master_lua_read_query(network_mysqld_con *con) {
network_mysqld_con_lua_t *st = con->plugin_con_state;
char command = -1;
network_socket *recv_sock = con->client;
GList *chunk = recv_sock->recv_queue->chunks->head;
GString *packet = chunk->data;
if (packet->len < NET_HEADER_SIZE) return PROXY_SEND_QUERY; /* packet too short */
command = packet->str[NET_HEADER_SIZE + 0];
if (COM_QUERY == command) {
/* we need some more data after the COM_QUERY */
if (packet->len < NET_HEADER_SIZE + 2) return PROXY_SEND_QUERY;
/* LOAD DATA INFILE is nasty */
if (packet->len - NET_HEADER_SIZE - 1 >= sizeof("LOAD ") - 1 &&
0 == g_ascii_strncasecmp(packet->str + NET_HEADER_SIZE + 1, C("LOAD "))) return PROXY_SEND_QUERY;
}
/* reset the query status */
network_injection_queue_reset(st->injected.queries);
/* ok, here we go */
#ifdef HAVE_LUA_H
switch(network_mysqld_con_lua_register_callback(con, con->config->lua_script)) {
case REGISTER_CALLBACK_SUCCESS:
break;
case REGISTER_CALLBACK_LOAD_FAILED:
network_mysqld_con_send_error(con->client, C("MySQL Proxy Lua script failed to load. Check the error log."));
con->state = CON_STATE_SEND_ERROR;
return PROXY_SEND_RESULT;
case REGISTER_CALLBACK_EXECUTE_FAILED:
network_mysqld_con_send_error(con->client, C("MySQL Proxy Lua script failed to execute. Check the error log."));
con->state = CON_STATE_SEND_ERROR;
return PROXY_SEND_RESULT;
}
if (st->L) {
lua_State *L = st->L;
network_mysqld_lua_stmt_ret ret = PROXY_NO_DECISION;
g_assert(lua_isfunction(L, -1));
lua_getfenv(L, -1);
g_assert(lua_istable(L, -1));
/**
* reset proxy.response to a empty table
*/
lua_getfield(L, -1, "proxy");
g_assert(lua_istable(L, -1));
lua_newtable(L);
lua_setfield(L, -2, "response");
lua_pop(L, 1);
/**
* get the call back
*/
lua_getfield_literal(L, -1, C("read_query"));
if (lua_isfunction(L, -1)) {
/* pass the packet as parameter */
lua_pushlstring(L, packet->str + NET_HEADER_SIZE, packet->len - NET_HEADER_SIZE);
if (lua_pcall(L, 1, 1, 0) != 0) {
/* hmm, the query failed */
g_critical("(read_query) %s", lua_tostring(L, -1));
lua_pop(L, 2); /* fenv + errmsg */
/* perhaps we should clean up ?*/
return PROXY_SEND_QUERY;
} else {
if (lua_isnumber(L, -1)) {
ret = lua_tonumber(L, -1);
}
lua_pop(L, 1);
}
switch (ret) {
case PROXY_SEND_RESULT:
/* check the proxy.response table for content,
*
*/
if (network_mysqld_con_lua_handle_proxy_response(con, con->config->lua_script)) {
/**
* handling proxy.response failed
*
* send a ERR packet
*/
network_mysqld_con_send_error(con->client, C("(lua) handling proxy.response failed, check error-log"));
}
break;
case PROXY_NO_DECISION:
/**
* PROXY_NO_DECISION and PROXY_SEND_QUERY may pick another backend
*/
break;
case PROXY_SEND_QUERY:
/* send the injected queries
*
* injection_new(..., query);
*
* */
if (st->injected.queries->length) {
ret = PROXY_SEND_INJECTION;
}
break;
default:
break;
}
lua_pop(L, 1); /* fenv */
} else {
lua_pop(L, 2); /* fenv + nil */
}
g_assert(lua_isfunction(L, -1));
if (ret != PROXY_NO_DECISION) {
return ret;
}
} else {
network_mysqld_con_handle_stmt(NULL, con, packet);
return PROXY_SEND_RESULT;
}
#endif
return PROXY_NO_DECISION;
}
