1404 lines
54 KiB
C
1404 lines
54 KiB
C
/*
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* This file is distributed as part of the SkySQL Gateway. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright SkySQL Ab 2013
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*/
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#include "mysql_client_server_protocol.h"
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#include <skygw_types.h>
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#include <skygw_utils.h>
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#include <log_manager.h>
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/*
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* MySQL Protocol module for handling the protocol between the gateway
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* and the backend MySQL database.
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*
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* Revision History
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* Date Who Description
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* 14/06/2013 Mark Riddoch Initial version
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* 17/06/2013 Massimiliano Pinto Added Gateway To Backends routines
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* 27/06/2013 Vilho Raatikka Added skygw_log_write command as an example
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* and necessary headers.
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* 01/07/2013 Massimiliano Pinto Put Log Manager example code behind SS_DEBUG macros.
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* 03/07/2013 Massimiliano Pinto Added delayq for incoming data before mysql connection
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* 04/07/2013 Massimiliano Pinto Added asyncrhronous MySQL protocol connection to backend
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* 05/07/2013 Massimiliano Pinto Added closeSession if backend auth fails
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* 12/07/2013 Massimiliano Pinto Added Mysql Change User via dcb->func.auth()
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* 15/07/2013 Massimiliano Pinto Added Mysql session change via dcb->func.session()
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* 17/07/2013 Massimiliano Pinto Added dcb->command update from gwbuf->command for proper routing
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server replies to client via router->clientReply
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* 04/09/2013 Massimiliano Pinto Added dcb->session and dcb->session->client checks for NULL
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* 12/09/2013 Massimiliano Pinto Added checks in gw_read_backend_event() for gw_read_backend_handshake
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* 27/09/2013 Massimiliano Pinto Changed in gw_read_backend_event the check for dcb_read(), now is if rc < 0
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*
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*/
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#include <modinfo.h>
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MODULE_INFO info = {
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MODULE_API_PROTOCOL,
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MODULE_BETA_RELEASE,
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GWPROTOCOL_VERSION,
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"The MySQL to backend server protocol"
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};
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extern int lm_enabled_logfiles_bitmask;
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static char *version_str = "V2.0.0";
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static int gw_create_backend_connection(DCB *backend, SERVER *server, SESSION *in_session);
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static int gw_read_backend_event(DCB* dcb);
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static int gw_write_backend_event(DCB *dcb);
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static int gw_MySQLWrite_backend(DCB *dcb, GWBUF *queue);
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static int gw_error_backend_event(DCB *dcb);
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static int gw_backend_close(DCB *dcb);
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static int gw_backend_hangup(DCB *dcb);
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static int backend_write_delayqueue(DCB *dcb);
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static void backend_set_delayqueue(DCB *dcb, GWBUF *queue);
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static int gw_change_user(DCB *backend_dcb, SERVER *server, SESSION *in_session, GWBUF *queue);
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static GWBUF* process_response_data (DCB* dcb, GWBUF* readbuf, int nbytes_to_process);
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#if defined(NOT_USED)
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static int gw_session(DCB *backend_dcb, void *data);
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#endif
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static MYSQL_session* gw_get_shared_session_auth_info(DCB* dcb);
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static GWPROTOCOL MyObject = {
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gw_read_backend_event, /* Read - EPOLLIN handler */
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gw_MySQLWrite_backend, /* Write - data from gateway */
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gw_write_backend_event, /* WriteReady - EPOLLOUT handler */
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gw_error_backend_event, /* Error - EPOLLERR handler */
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gw_backend_hangup, /* HangUp - EPOLLHUP handler */
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NULL, /* Accept */
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gw_create_backend_connection, /* Connect */
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gw_backend_close, /* Close */
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NULL, /* Listen */
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gw_change_user, /* Authentication */
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NULL /* Session */
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};
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/*
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* Implementation of the mandatory version entry point
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*
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* @return version string of the module
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*/
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char *
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version()
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{
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return version_str;
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}
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/*
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* The module initialisation routine, called when the module
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* is first loaded.
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*/
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void
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ModuleInit()
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{
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}
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/*
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* The module entry point routine. It is this routine that
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* must populate the structure that is referred to as the
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* "module object", this is a structure with the set of
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* external entry points for this module.
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*
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* @return The module object
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*/
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GWPROTOCOL *
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GetModuleObject()
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{
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return &MyObject;
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}
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static MYSQL_session* gw_get_shared_session_auth_info(
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DCB* dcb)
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{
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MYSQL_session* auth_info = NULL;
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CHK_DCB(dcb);
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CHK_SESSION(dcb->session);
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spinlock_acquire(&dcb->session->ses_lock);
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if (dcb->session->state != SESSION_STATE_ALLOC) {
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auth_info = dcb->session->data;
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} else {
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"%lu [gw_get_shared_session_auth_info] Couldn't get "
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"session authentication info. Session in a wrong state %d.",
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pthread_self(),
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dcb->session->state)));
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}
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spinlock_release(&dcb->session->ses_lock);
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return auth_info;
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}
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/**
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* Backend Read Event for EPOLLIN on the MySQL backend protocol module
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* @param dcb The backend Descriptor Control Block
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* @return 1 on operation, 0 for no action
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*/
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static int gw_read_backend_event(DCB *dcb) {
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MySQLProtocol *client_protocol = NULL;
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MySQLProtocol *backend_protocol = NULL;
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MYSQL_session *current_session = NULL;
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int rc = 0;
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CHK_DCB(dcb);
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CHK_SESSION(dcb->session);
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/*< return only with complete session */
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current_session = gw_get_shared_session_auth_info(dcb);
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ss_dassert(current_session != NULL);
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backend_protocol = (MySQLProtocol *) dcb->protocol;
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CHK_PROTOCOL(backend_protocol);
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LOGIF(LD, (skygw_log_write(
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LOGFILE_DEBUG,
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"%lu [gw_read_backend_event] Read dcb %p fd %d protocol "
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"state %d, %s.",
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pthread_self(),
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dcb,
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dcb->fd,
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backend_protocol->protocol_auth_state,
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STRPROTOCOLSTATE(backend_protocol->protocol_auth_state))));
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/* backend is connected:
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*
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* 1. read server handshake
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* 2. if (success) write auth request
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* 3. and return
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*/
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/*<
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* If starting to auhenticate with backend server, lock dcb
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* to prevent overlapping processing of auth messages.
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*/
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if (backend_protocol->protocol_auth_state == MYSQL_CONNECTED)
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{
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spinlock_acquire(&dcb->authlock);
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backend_protocol = (MySQLProtocol *) dcb->protocol;
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CHK_PROTOCOL(backend_protocol);
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if (backend_protocol->protocol_auth_state == MYSQL_CONNECTED)
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{
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if (gw_read_backend_handshake(backend_protocol) != 0)
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{
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backend_protocol->protocol_auth_state = MYSQL_AUTH_FAILED;
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LOGIF(LD, (skygw_log_write(
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LOGFILE_DEBUG,
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"%lu [gw_read_backend_event] after "
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"gw_read_backend_handshake, fd %d, "
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"state = MYSQL_AUTH_FAILED.",
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pthread_self(),
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backend_protocol->owner_dcb->fd)));
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}
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else
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{
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/* handshake decoded, send the auth credentials */
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if (gw_send_authentication_to_backend(
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current_session->db,
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current_session->user,
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current_session->client_sha1,
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backend_protocol) != 0)
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{
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backend_protocol->protocol_auth_state = MYSQL_AUTH_FAILED;
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LOGIF(LD, (skygw_log_write(
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LOGFILE_DEBUG,
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"%lu [gw_read_backend_event] after "
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"gw_send_authentication_to_backend "
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"fd %d, state = MYSQL_AUTH_FAILED.",
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pthread_self(),
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backend_protocol->owner_dcb->fd)));
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}
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else
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{
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backend_protocol->protocol_auth_state = MYSQL_AUTH_RECV;
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}
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}
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}
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spinlock_release(&dcb->authlock);
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}
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/*
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* Now:
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* -- check the authentication reply from backend
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* OR
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* -- handle a previous handshake error
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*/
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if (backend_protocol->protocol_auth_state == MYSQL_AUTH_RECV ||
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backend_protocol->protocol_auth_state == MYSQL_AUTH_FAILED)
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{
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spinlock_acquire(&dcb->authlock);
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backend_protocol = (MySQLProtocol *) dcb->protocol;
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CHK_PROTOCOL(backend_protocol);
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if (backend_protocol->protocol_auth_state == MYSQL_AUTH_RECV ||
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backend_protocol->protocol_auth_state == MYSQL_AUTH_FAILED)
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{
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ROUTER_OBJECT *router = NULL;
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ROUTER *router_instance = NULL;
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void *rsession = NULL;
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SESSION *session = dcb->session;
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int receive_rc = 0;
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CHK_SESSION(session);
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router = session->service->router;
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router_instance = session->service->router_instance;
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rsession = session->router_session;
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if (backend_protocol->protocol_auth_state == MYSQL_AUTH_RECV) {
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/*<
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* Read backed auth reply
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*/
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receive_rc =
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gw_receive_backend_auth(backend_protocol);
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switch (receive_rc) {
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case -1:
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backend_protocol->protocol_auth_state = MYSQL_AUTH_FAILED;
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LOGIF(LD, (skygw_log_write(
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LOGFILE_DEBUG,
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"%lu [gw_read_backend_event] after "
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"gw_receive_backend_authentication "
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"fd %d, state = MYSQL_AUTH_FAILED.",
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pthread_self(),
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backend_protocol->owner_dcb->fd)));
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|
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Backend server didn't "
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"accept authentication for user "
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"%s.",
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current_session->user)));
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break;
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case 1:
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backend_protocol->protocol_auth_state = MYSQL_IDLE;
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LOGIF(LD, (skygw_log_write_flush(
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LOGFILE_DEBUG,
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"%lu [gw_read_backend_event] "
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"gw_receive_backend_auth succeed. "
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"dcb %p fd %d, user %s.",
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pthread_self(),
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dcb,
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dcb->fd,
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current_session->user)));
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break;
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default:
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ss_dassert(receive_rc == 0);
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LOGIF(LD, (skygw_log_write_flush(
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LOGFILE_DEBUG,
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"%lu [gw_read_backend_event] "
|
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"gw_receive_backend_auth read "
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"successfully "
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"nothing. dcb %p fd %d, user %s.",
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pthread_self(),
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dcb,
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dcb->fd,
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current_session->user)));
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rc = 0;
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goto return_with_lock;
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break;
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} /* switch */
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}
|
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|
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if (backend_protocol->protocol_auth_state == MYSQL_AUTH_FAILED)
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{
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/**
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* protocol state won't change anymore,
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* lock can be freed
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*/
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spinlock_release(&dcb->authlock);
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spinlock_acquire(&dcb->delayqlock);
|
|
|
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if (dcb->delayq != NULL)
|
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{
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|
while ((dcb->delayq = gwbuf_consume(
|
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dcb->delayq,
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GWBUF_LENGTH(dcb->delayq))) != NULL);
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}
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spinlock_release(&dcb->delayqlock);
|
|
|
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{
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GWBUF* errbuf;
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bool succp;
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|
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/* try reload users' table for next connection */
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service_refresh_users(dcb->session->service);
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#if defined(SS_DEBUG)
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LOGIF(LD, (skygw_log_write(
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LOGFILE_DEBUG,
|
|
"%lu [gw_read_backend_event] "
|
|
"calling handleError. Backend "
|
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"DCB %p, session %p",
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pthread_self(),
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dcb,
|
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dcb->session)));
|
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#endif
|
|
|
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errbuf = mysql_create_custom_error(
|
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1,
|
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0,
|
|
"Authentication with backend failed. "
|
|
"Session will be closed.");
|
|
|
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router->handleError(router_instance,
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|
rsession,
|
|
errbuf,
|
|
dcb,
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ERRACT_REPLY_CLIENT,
|
|
&succp);
|
|
|
|
ss_dassert(!succp);
|
|
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_read_backend_event] "
|
|
"after calling handleError. Backend "
|
|
"DCB %p, session %p",
|
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pthread_self(),
|
|
dcb,
|
|
dcb->session)));
|
|
|
|
if (session != NULL)
|
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{
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spinlock_acquire(&session->ses_lock);
|
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session->state = SESSION_STATE_STOPPING;
|
|
spinlock_release(&session->ses_lock);
|
|
}
|
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dcb_close(dcb);
|
|
}
|
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rc = 1;
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goto return_rc;
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}
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|
else
|
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{
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|
ss_dassert(backend_protocol->protocol_auth_state == MYSQL_IDLE);
|
|
LOGIF(LD, (skygw_log_write_flush(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_read_backend_event] "
|
|
"gw_receive_backend_auth succeed. Fd %d, "
|
|
"user %s.",
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pthread_self(),
|
|
dcb->fd,
|
|
current_session->user)));
|
|
|
|
/* check the delay queue and flush the data */
|
|
if (dcb->delayq)
|
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{
|
|
rc = backend_write_delayqueue(dcb);
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goto return_with_lock;
|
|
}
|
|
}
|
|
} /* MYSQL_AUTH_RECV || MYSQL_AUTH_FAILED */
|
|
|
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spinlock_release(&dcb->authlock);
|
|
|
|
} /* MYSQL_AUTH_RECV || MYSQL_AUTH_FAILED */
|
|
|
|
/* reading MySQL command output from backend and writing to the client */
|
|
{
|
|
GWBUF *read_buffer = NULL;
|
|
ROUTER_OBJECT *router = NULL;
|
|
ROUTER *router_instance = NULL;
|
|
SESSION *session = dcb->session;
|
|
int nbytes_read = 0;
|
|
|
|
CHK_SESSION(session);
|
|
router = session->service->router;
|
|
router_instance = session->service->router_instance;
|
|
|
|
/* read available backend data */
|
|
rc = dcb_read(dcb, &read_buffer);
|
|
|
|
if (rc < 0)
|
|
{
|
|
GWBUF* errbuf;
|
|
bool succp;
|
|
#if defined(SS_DEBUG)
|
|
LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
|
|
"Backend read error handling #2.")));
|
|
#endif
|
|
errbuf = mysql_create_custom_error(
|
|
1,
|
|
0,
|
|
"Read from backend failed");
|
|
|
|
router->handleError(router_instance,
|
|
session->router_session,
|
|
errbuf,
|
|
dcb,
|
|
ERRACT_NEW_CONNECTION,
|
|
&succp);
|
|
|
|
if (!succp)
|
|
{
|
|
spinlock_acquire(&session->ses_lock);
|
|
session->state = SESSION_STATE_STOPPING;
|
|
spinlock_release(&session->ses_lock);
|
|
}
|
|
dcb_close(dcb);
|
|
rc = 0;
|
|
goto return_rc;
|
|
}
|
|
nbytes_read = gwbuf_length(read_buffer);
|
|
|
|
if (nbytes_read == 0)
|
|
{
|
|
goto return_rc;
|
|
}
|
|
else
|
|
{
|
|
ss_dassert(read_buffer != NULL);
|
|
}
|
|
|
|
/** Packet prefix was read earlier */
|
|
if (dcb->dcb_readqueue)
|
|
{
|
|
read_buffer = gwbuf_append(dcb->dcb_readqueue, read_buffer);
|
|
nbytes_read = gwbuf_length(read_buffer);
|
|
|
|
if (nbytes_read < 5) /*< read at least command type */
|
|
{
|
|
rc = 0;
|
|
goto return_rc;
|
|
}
|
|
/** There is at least length and command type. */
|
|
else
|
|
{
|
|
read_buffer = dcb->dcb_readqueue;
|
|
dcb->dcb_readqueue = NULL;
|
|
}
|
|
}
|
|
/** This may be either short prefix of a packet, or the tail of it. */
|
|
else
|
|
{
|
|
if (nbytes_read < 5)
|
|
{
|
|
dcb->dcb_readqueue = gwbuf_append(dcb->dcb_readqueue, read_buffer);
|
|
rc = 0;
|
|
goto return_rc;
|
|
}
|
|
}
|
|
/**
|
|
* If protocol has session command set, concatenate whole
|
|
* response into one buffer.
|
|
*/
|
|
if (protocol_get_srv_command((MySQLProtocol *)dcb->protocol, false) !=
|
|
MYSQL_COM_UNDEFINED)
|
|
{
|
|
read_buffer = process_response_data(dcb, read_buffer, nbytes_read);
|
|
}
|
|
/*<
|
|
* If dcb->session->client is freed already it may be NULL.
|
|
*/
|
|
if (dcb->session->client != NULL)
|
|
{
|
|
client_protocol = SESSION_PROTOCOL(dcb->session,
|
|
MySQLProtocol);
|
|
if (client_protocol != NULL)
|
|
{
|
|
CHK_PROTOCOL(client_protocol);
|
|
|
|
if (client_protocol->protocol_auth_state ==
|
|
MYSQL_IDLE)
|
|
{
|
|
gwbuf_set_type(read_buffer, GWBUF_TYPE_MYSQL);
|
|
|
|
router->clientReply(
|
|
router_instance,
|
|
session->router_session,
|
|
read_buffer,
|
|
dcb);
|
|
rc = 1;
|
|
}
|
|
goto return_rc;
|
|
}
|
|
else if (dcb->session->client->dcb_role == DCB_ROLE_INTERNAL)
|
|
{
|
|
gwbuf_set_type(read_buffer, GWBUF_TYPE_MYSQL);
|
|
router->clientReply(router_instance, session->router_session, read_buffer, dcb);
|
|
rc = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return_rc:
|
|
return rc;
|
|
|
|
return_with_lock:
|
|
spinlock_release(&dcb->authlock);
|
|
goto return_rc;
|
|
}
|
|
|
|
/*
|
|
* EPOLLOUT handler for the MySQL Backend protocol module.
|
|
*
|
|
* @param dcb The descriptor control block
|
|
* @return 1 in success, 0 in case of failure,
|
|
*/
|
|
static int gw_write_backend_event(DCB *dcb) {
|
|
int rc = 0;
|
|
MySQLProtocol *backend_protocol = dcb->protocol;
|
|
|
|
/*<
|
|
* Don't write to backend if backend_dcb is not in poll set anymore.
|
|
*/
|
|
if (dcb->state != DCB_STATE_POLLING) {
|
|
uint8_t* data;
|
|
|
|
if (dcb->writeq != NULL)
|
|
{
|
|
data = (uint8_t *)GWBUF_DATA(dcb->writeq);
|
|
|
|
if (!(MYSQL_IS_COM_QUIT(data)))
|
|
{
|
|
/*< vraa : errorHandle */
|
|
mysql_send_custom_error(
|
|
dcb->session->client,
|
|
1,
|
|
0,
|
|
"Writing to backend failed due invalid Maxscale "
|
|
"state.");
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_write_backend_event] Write to backend "
|
|
"dcb %p fd %d "
|
|
"failed due invalid state %s.",
|
|
pthread_self(),
|
|
dcb,
|
|
dcb->fd,
|
|
STRDCBSTATE(dcb->state))));
|
|
|
|
LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
|
|
"Error : Attempt to write buffered data to backend "
|
|
"failed "
|
|
"due internal inconsistent state.")));
|
|
|
|
rc = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_write_backend_event] Dcb %p in state %s "
|
|
"but there's nothing to write either.",
|
|
pthread_self(),
|
|
dcb,
|
|
STRDCBSTATE(dcb->state))));
|
|
rc = 1;
|
|
}
|
|
goto return_rc;
|
|
}
|
|
|
|
if (backend_protocol->protocol_auth_state == MYSQL_PENDING_CONNECT) {
|
|
backend_protocol->protocol_auth_state = MYSQL_CONNECTED;
|
|
rc = 1;
|
|
goto return_rc;
|
|
}
|
|
dcb_drain_writeq(dcb);
|
|
rc = 1;
|
|
return_rc:
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_write_backend_event] "
|
|
"wrote to dcb %p fd %d, return %d",
|
|
pthread_self(),
|
|
dcb,
|
|
dcb->fd,
|
|
rc)));
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Write function for backend DCB. Store command to protocol.
|
|
*
|
|
* @param dcb The DCB of the backend
|
|
* @param queue Queue of buffers to write
|
|
* @return 0 on failure, 1 on success
|
|
*/
|
|
static int
|
|
gw_MySQLWrite_backend(DCB *dcb, GWBUF *queue)
|
|
{
|
|
MySQLProtocol *backend_protocol = dcb->protocol;
|
|
int rc = 0;
|
|
|
|
spinlock_acquire(&dcb->authlock);
|
|
/**
|
|
* Pick action according to state of protocol.
|
|
* If auth failed, return value is 0, write and buffered write
|
|
* return 1.
|
|
*/
|
|
switch (backend_protocol->protocol_auth_state) {
|
|
case MYSQL_AUTH_FAILED:
|
|
{
|
|
size_t len;
|
|
char* str;
|
|
uint8_t* packet = (uint8_t *)queue->start;
|
|
uint8_t* startpoint;
|
|
|
|
len = (size_t)MYSQL_GET_PACKET_LEN(packet);
|
|
startpoint = &packet[5];
|
|
str = (char *)malloc(len+1);
|
|
snprintf(str, len+1, "%s", startpoint);
|
|
LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
|
|
"Error : Unable to write to backend due to "
|
|
"authentication failure.")));
|
|
/** Consume query buffer */
|
|
while ((queue = gwbuf_consume(
|
|
queue,
|
|
GWBUF_LENGTH(queue))) != NULL);
|
|
free(str);
|
|
rc = 0;
|
|
spinlock_release(&dcb->authlock);
|
|
goto return_rc;
|
|
break;
|
|
}
|
|
|
|
case MYSQL_IDLE:
|
|
{
|
|
uint8_t* ptr = GWBUF_DATA(queue);
|
|
int cmd = MYSQL_GET_COMMAND(ptr);
|
|
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_MySQLWrite_backend] write to dcb %p "
|
|
"fd %d protocol state %s.",
|
|
pthread_self(),
|
|
dcb,
|
|
dcb->fd,
|
|
STRPROTOCOLSTATE(backend_protocol->protocol_auth_state))));
|
|
|
|
spinlock_release(&dcb->authlock);
|
|
/**
|
|
* Statement type is used in readwrite split router.
|
|
* Command is *not* set for readconn router.
|
|
*
|
|
* Server commands are stored to MySQLProtocol structure
|
|
* if buffer always includes a single statement.
|
|
*/
|
|
if (GWBUF_IS_TYPE_SINGLE_STMT(queue) &&
|
|
GWBUF_IS_TYPE_SESCMD(queue))
|
|
{
|
|
/** Record the command to backend's protocol */
|
|
protocol_add_srv_command(backend_protocol, cmd);
|
|
}
|
|
/** Write to backend */
|
|
rc = dcb_write(dcb, queue);
|
|
goto return_rc;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
{
|
|
uint8_t* ptr = GWBUF_DATA(queue);
|
|
int cmd = MYSQL_GET_COMMAND(ptr);
|
|
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_MySQLWrite_backend] delayed write to "
|
|
"dcb %p fd %d protocol state %s.",
|
|
pthread_self(),
|
|
dcb,
|
|
dcb->fd,
|
|
STRPROTOCOLSTATE(backend_protocol->protocol_auth_state))));
|
|
/**
|
|
* In case of session commands, store command to DCB's
|
|
* protocol struct.
|
|
*/
|
|
if (GWBUF_IS_TYPE_SINGLE_STMT(queue) &&
|
|
GWBUF_IS_TYPE_SESCMD(queue))
|
|
{
|
|
/** Record the command to backend's protocol */
|
|
protocol_add_srv_command(backend_protocol, cmd);
|
|
}
|
|
/*<
|
|
* Now put the incoming data to the delay queue unless backend is
|
|
* connected with auth ok
|
|
*/
|
|
backend_set_delayqueue(dcb, queue);
|
|
spinlock_release(&dcb->authlock);
|
|
rc = 1;
|
|
goto return_rc;
|
|
break;
|
|
}
|
|
}
|
|
return_rc:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Error event handler.
|
|
* Create error message, pass it to router's error handler and if error
|
|
* handler fails in providing enough backend servers, mark session being
|
|
* closed and call DCB close function which triggers closing router session
|
|
* and related backends (if any exists.
|
|
*/
|
|
static int gw_error_backend_event(DCB *dcb)
|
|
{
|
|
SESSION* session;
|
|
void* rsession;
|
|
ROUTER_OBJECT* router;
|
|
ROUTER* router_instance;
|
|
GWBUF* errbuf;
|
|
bool succp;
|
|
session_state_t ses_state;
|
|
|
|
CHK_DCB(dcb);
|
|
session = dcb->session;
|
|
CHK_SESSION(session);
|
|
rsession = session->router_session;
|
|
router = session->service->router;
|
|
router_instance = session->service->router_instance;
|
|
|
|
/**
|
|
* Avoid running redundant error handling procedure.
|
|
* dcb_close is already called for the DCB. Thus, either connection is
|
|
* closed by router and COM_QUIT sent or there was an error which
|
|
* have already been handled.
|
|
*/
|
|
if (dcb->state != DCB_STATE_POLLING)
|
|
{
|
|
return 1;
|
|
}
|
|
errbuf = mysql_create_custom_error(
|
|
1,
|
|
0,
|
|
"Lost connection to backend server.");
|
|
|
|
spinlock_acquire(&session->ses_lock);
|
|
ses_state = session->state;
|
|
spinlock_release(&session->ses_lock);
|
|
|
|
/**
|
|
* Session might be initialized when DCB already is in the poll set.
|
|
* Thus hangup can occur in the middle of session initialization.
|
|
* Only complete and successfully initialized sessions allow for
|
|
* calling error handler.
|
|
*/
|
|
while (ses_state == SESSION_STATE_READY)
|
|
{
|
|
spinlock_acquire(&session->ses_lock);
|
|
ses_state = session->state;
|
|
spinlock_release(&session->ses_lock);
|
|
}
|
|
|
|
if (ses_state != SESSION_STATE_ROUTER_READY)
|
|
{
|
|
gwbuf_free(errbuf);
|
|
goto retblock;
|
|
}
|
|
|
|
#if defined(SS_DEBUG)
|
|
LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
|
|
"Backend error event handling.")));
|
|
#endif
|
|
router->handleError(router_instance,
|
|
rsession,
|
|
errbuf,
|
|
dcb,
|
|
ERRACT_NEW_CONNECTION,
|
|
&succp);
|
|
|
|
/** There are not required backends available, close session. */
|
|
if (!succp) {
|
|
spinlock_acquire(&session->ses_lock);
|
|
session->state = SESSION_STATE_STOPPING;
|
|
spinlock_release(&session->ses_lock);
|
|
}
|
|
dcb_close(dcb);
|
|
|
|
retblock:
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Create a new backend connection.
|
|
*
|
|
* This routine will connect to a backend server and it is called by dbc_connect
|
|
* in router->newSession
|
|
*
|
|
* @param backend_dcb, in, out, use - backend DCB allocated from dcb_connect
|
|
* @param server, in, use - server to connect to
|
|
* @param session, in use - current session from client DCB
|
|
* @return 0/1 on Success and -1 on Failure.
|
|
* If succesful, returns positive fd to socket which is connected to
|
|
* backend server. Positive fd is copied to protocol and to dcb.
|
|
* If fails, fd == -1 and socket is closed.
|
|
*/
|
|
static int gw_create_backend_connection(
|
|
DCB *backend_dcb,
|
|
SERVER *server,
|
|
SESSION *session)
|
|
{
|
|
MySQLProtocol *protocol = NULL;
|
|
int rv = -1;
|
|
int fd = -1;
|
|
|
|
protocol = mysql_protocol_init(backend_dcb, -1);
|
|
ss_dassert(protocol != NULL);
|
|
|
|
if (protocol == NULL) {
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_create_backend_connection] Failed to create "
|
|
"protocol object for backend connection.",
|
|
pthread_self())));
|
|
LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
|
|
"Error: Failed to create "
|
|
"protocol object for backend connection.")));
|
|
goto return_fd;
|
|
}
|
|
|
|
/*< if succeed, fd > 0, -1 otherwise */
|
|
rv = gw_do_connect_to_backend(server->name, server->port, &fd);
|
|
/*< Assign protocol with backend_dcb */
|
|
backend_dcb->protocol = protocol;
|
|
|
|
/*< Set protocol state */
|
|
switch (rv) {
|
|
case 0:
|
|
ss_dassert(fd > 0);
|
|
protocol->fd = fd;
|
|
protocol->protocol_auth_state = MYSQL_CONNECTED;
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_create_backend_connection] Established "
|
|
"connection to %s:%i, protocol fd %d client "
|
|
"fd %d.",
|
|
pthread_self(),
|
|
server->name,
|
|
server->port,
|
|
protocol->fd,
|
|
session->client->fd)));
|
|
break;
|
|
|
|
case 1:
|
|
ss_dassert(fd > 0);
|
|
protocol->protocol_auth_state = MYSQL_PENDING_CONNECT;
|
|
protocol->fd = fd;
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_create_backend_connection] Connection "
|
|
"pending to %s:%i, protocol fd %d client fd %d.",
|
|
pthread_self(),
|
|
server->name,
|
|
server->port,
|
|
protocol->fd,
|
|
session->client->fd)));
|
|
break;
|
|
|
|
default:
|
|
ss_dassert(fd == -1);
|
|
ss_dassert(protocol->protocol_auth_state == MYSQL_ALLOC);
|
|
LOGIF(LD, (skygw_log_write(
|
|
LOGFILE_DEBUG,
|
|
"%lu [gw_create_backend_connection] Connection "
|
|
"failed to %s:%i, protocol fd %d client fd %d.",
|
|
pthread_self(),
|
|
server->name,
|
|
server->port,
|
|
protocol->fd,
|
|
session->client->fd)));
|
|
break;
|
|
} /*< switch */
|
|
|
|
return_fd:
|
|
return fd;
|
|
}
|
|
|
|
|
|
/**
|
|
* Error event handler.
|
|
* Create error message, pass it to router's error handler and if error
|
|
* handler fails in providing enough backend servers, mark session being
|
|
* closed and call DCB close function which triggers closing router session
|
|
* and related backends (if any exists.
|
|
*
|
|
* @param dcb The current Backend DCB
|
|
* @return 1 always
|
|
*/
|
|
static int
|
|
gw_backend_hangup(DCB *dcb)
|
|
{
|
|
SESSION* session;
|
|
void* rsession;
|
|
ROUTER_OBJECT* router;
|
|
ROUTER* router_instance;
|
|
bool succp;
|
|
GWBUF* errbuf;
|
|
session_state_t ses_state;
|
|
|
|
CHK_DCB(dcb);
|
|
session = dcb->session;
|
|
CHK_SESSION(session);
|
|
|
|
rsession = session->router_session;
|
|
router = session->service->router;
|
|
router_instance = session->service->router_instance;
|
|
|
|
errbuf = mysql_create_custom_error(
|
|
1,
|
|
0,
|
|
"Lost connection to backend server.");
|
|
|
|
spinlock_acquire(&session->ses_lock);
|
|
ses_state = session->state;
|
|
spinlock_release(&session->ses_lock);
|
|
|
|
/**
|
|
* Session might be initialized when DCB already is in the poll set.
|
|
* Thus hangup can occur in the middle of session initialization.
|
|
* Only complete and successfully initialized sessions allow for
|
|
* calling error handler.
|
|
*/
|
|
while (ses_state == SESSION_STATE_READY)
|
|
{
|
|
spinlock_acquire(&session->ses_lock);
|
|
ses_state = session->state;
|
|
spinlock_release(&session->ses_lock);
|
|
}
|
|
|
|
if (ses_state != SESSION_STATE_ROUTER_READY)
|
|
{
|
|
gwbuf_free(errbuf);
|
|
goto retblock;
|
|
}
|
|
#if defined(SS_DEBUG)
|
|
LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
|
|
"Backend hangup error handling.")));
|
|
#endif
|
|
|
|
router->handleError(router_instance,
|
|
rsession,
|
|
errbuf,
|
|
dcb,
|
|
ERRACT_NEW_CONNECTION,
|
|
&succp);
|
|
|
|
/** There are not required backends available, close session. */
|
|
if (!succp)
|
|
{
|
|
#if defined(SS_DEBUG)
|
|
LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
|
|
"Backend hangup -> closing session.")));
|
|
#endif
|
|
|
|
spinlock_acquire(&session->ses_lock);
|
|
session->state = SESSION_STATE_STOPPING;
|
|
spinlock_release(&session->ses_lock);
|
|
}
|
|
dcb_close(dcb);
|
|
|
|
retblock:
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* Send COM_QUIT to backend so that it can be closed.
|
|
* @param dcb The current Backend DCB
|
|
* @return 1 always
|
|
*/
|
|
static int
|
|
gw_backend_close(DCB *dcb)
|
|
{
|
|
DCB* client_dcb;
|
|
SESSION* session;
|
|
GWBUF* quitbuf;
|
|
|
|
CHK_DCB(dcb);
|
|
session = dcb->session;
|
|
CHK_SESSION(session);
|
|
|
|
quitbuf = mysql_create_com_quit(NULL, 0);
|
|
gwbuf_set_type(quitbuf, GWBUF_TYPE_MYSQL);
|
|
|
|
/** Send COM_QUIT to the backend being closed */
|
|
mysql_send_com_quit(dcb, 0, quitbuf);
|
|
|
|
mysql_protocol_done(dcb);
|
|
|
|
if (session != NULL && session->state == SESSION_STATE_STOPPING)
|
|
{
|
|
client_dcb = session->client;
|
|
|
|
if (client_dcb != NULL &&
|
|
client_dcb->state == DCB_STATE_POLLING)
|
|
{
|
|
/** Close client DCB */
|
|
dcb_close(client_dcb);
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* This routine put into the delay queue the input queue
|
|
* The input is what backend DCB is receiving
|
|
* The routine is called from func.write() when mysql backend connection
|
|
* is not yet complete buu there are inout data from client
|
|
*
|
|
* @param dcb The current backend DCB
|
|
* @param queue Input data in the GWBUF struct
|
|
*/
|
|
static void backend_set_delayqueue(DCB *dcb, GWBUF *queue) {
|
|
spinlock_acquire(&dcb->delayqlock);
|
|
|
|
if (dcb->delayq) {
|
|
/* Append data */
|
|
dcb->delayq = gwbuf_append(dcb->delayq, queue);
|
|
} else {
|
|
if (queue != NULL) {
|
|
/* create the delay queue */
|
|
dcb->delayq = queue;
|
|
}
|
|
}
|
|
spinlock_release(&dcb->delayqlock);
|
|
}
|
|
|
|
/**
|
|
* This routine writes the delayq via dcb_write
|
|
* The dcb->delayq contains data received from the client before
|
|
* mysql backend authentication succeded
|
|
*
|
|
* @param dcb The current backend DCB
|
|
* @return The dcb_write status
|
|
*/
|
|
static int backend_write_delayqueue(DCB *dcb)
|
|
{
|
|
GWBUF *localq = NULL;
|
|
int rc;
|
|
|
|
spinlock_acquire(&dcb->delayqlock);
|
|
|
|
if (dcb->delayq == NULL)
|
|
{
|
|
spinlock_release(&dcb->delayqlock);
|
|
rc = 1;
|
|
}
|
|
else
|
|
{
|
|
localq = dcb->delayq;
|
|
dcb->delayq = NULL;
|
|
spinlock_release(&dcb->delayqlock);
|
|
rc = dcb_write(dcb, localq);
|
|
}
|
|
|
|
if (rc == 0)
|
|
{
|
|
GWBUF* errbuf;
|
|
bool succp;
|
|
ROUTER_OBJECT *router = NULL;
|
|
ROUTER *router_instance = NULL;
|
|
void *rsession = NULL;
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|
SESSION *session = dcb->session;
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|
|
|
CHK_SESSION(session);
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|
|
|
router = session->service->router;
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|
router_instance = session->service->router_instance;
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|
rsession = session->router_session;
|
|
#if defined(SS_DEBUG)
|
|
LOGIF(LE, (skygw_log_write_flush(
|
|
LOGFILE_ERROR,
|
|
"Backend write delayqueue error handling.")));
|
|
#endif
|
|
errbuf = mysql_create_custom_error(
|
|
1,
|
|
0,
|
|
"Failed to write buffered data to back-end server. "
|
|
"Buffer was empty or back-end was disconnected during "
|
|
"operation. Session will be closed.");
|
|
|
|
router->handleError(router_instance,
|
|
rsession,
|
|
errbuf,
|
|
dcb,
|
|
ERRACT_NEW_CONNECTION,
|
|
&succp);
|
|
|
|
if (!succp)
|
|
{
|
|
if (session != NULL)
|
|
{
|
|
spinlock_acquire(&session->ses_lock);
|
|
session->state = SESSION_STATE_STOPPING;
|
|
spinlock_release(&session->ses_lock);
|
|
}
|
|
dcb_close(dcb);
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
static int gw_change_user(
|
|
DCB *backend,
|
|
SERVER *server,
|
|
SESSION *in_session,
|
|
GWBUF *queue)
|
|
{
|
|
MYSQL_session *current_session = NULL;
|
|
MySQLProtocol *backend_protocol = NULL;
|
|
MySQLProtocol *client_protocol = NULL;
|
|
char username[MYSQL_USER_MAXLEN+1]="";
|
|
char database[MYSQL_DATABASE_MAXLEN+1]="";
|
|
uint8_t client_sha1[MYSQL_SCRAMBLE_LEN]="";
|
|
uint8_t *client_auth_packet = GWBUF_DATA(queue);
|
|
unsigned int auth_token_len = 0;
|
|
uint8_t *auth_token = NULL;
|
|
int rv = -1;
|
|
int auth_ret = 1;
|
|
|
|
current_session = (MYSQL_session *)in_session->client->data;
|
|
backend_protocol = backend->protocol;
|
|
client_protocol = in_session->client->protocol;
|
|
|
|
// now get the user, after 4 bytes header and 1 byte command
|
|
client_auth_packet += 5;
|
|
strcpy(username, (char *)client_auth_packet);
|
|
client_auth_packet += strlen(username) + 1;
|
|
|
|
// get the auth token len
|
|
memcpy(&auth_token_len, client_auth_packet, 1);
|
|
ss_dassert(auth_token_len >= 0);
|
|
|
|
client_auth_packet++;
|
|
|
|
// allocate memory for token only if auth_token_len > 0
|
|
if (auth_token_len > 0) {
|
|
auth_token = (uint8_t *)malloc(auth_token_len);
|
|
ss_dassert(auth_token != NULL);
|
|
|
|
if (auth_token == NULL)
|
|
return rv;
|
|
memcpy(auth_token, client_auth_packet, auth_token_len);
|
|
client_auth_packet += auth_token_len;
|
|
}
|
|
// decode the token and check the password
|
|
// Note: if auth_token_len == 0 && auth_token == NULL, user is without password
|
|
auth_ret = gw_check_mysql_scramble_data(backend->session->client, auth_token, auth_token_len, client_protocol->scramble, sizeof(client_protocol->scramble), username, client_sha1);
|
|
|
|
if (auth_ret != 0) {
|
|
if (!service_refresh_users(backend->session->client->service)) {
|
|
/* Try authentication again with new repository data */
|
|
/* Note: if no auth client authentication will fail */
|
|
auth_ret = gw_check_mysql_scramble_data(backend->session->client, auth_token, auth_token_len, client_protocol->scramble, sizeof(client_protocol->scramble), username, client_sha1);
|
|
}
|
|
}
|
|
|
|
// let's free the auth_token now
|
|
if (auth_token)
|
|
free(auth_token);
|
|
|
|
if (auth_ret != 0) {
|
|
/*< vraa : errorHandle */
|
|
|
|
// send the error packet
|
|
mysql_send_auth_error(backend->session->client, 1, 0, "Authorization failed on change_user");
|
|
rv = 1;
|
|
|
|
} else {
|
|
// get db name
|
|
strcpy(database, (char *)client_auth_packet);
|
|
|
|
rv = gw_send_change_user_to_backend(database, username, client_sha1, backend_protocol);
|
|
|
|
/*<
|
|
* Now copy new data into user session
|
|
*/
|
|
strcpy(current_session->user, username);
|
|
strcpy(current_session->db, database);
|
|
memcpy(current_session->client_sha1, client_sha1, sizeof(current_session->client_sha1));
|
|
}
|
|
gwbuf_free(queue);
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* Session Change wrapper for func.write
|
|
* The reply packet will be back routed to the right server
|
|
* in the gw_read_backend_event checking the ROUTER_CHANGE_SESSION command in dcb->command
|
|
*
|
|
* @param
|
|
* @return always 1
|
|
*/
|
|
/*
|
|
static int gw_session(DCB *backend_dcb, void *data) {
|
|
|
|
GWBUF *queue = NULL;
|
|
|
|
queue = (GWBUF *) data;
|
|
backend_dcb->func.write(backend_dcb, queue);
|
|
|
|
return 1;
|
|
}
|
|
*/
|
|
|
|
|
|
/**
|
|
* Move packets or parts of packets from redbuf to outbuf as the packet headers
|
|
* and lengths have been noticed and counted.
|
|
* Session commands need to be marked so that they can be handled properly in
|
|
* the router's clientReply.
|
|
* Return the pointer to outbuf.
|
|
*/
|
|
static GWBUF* process_response_data (
|
|
DCB* dcb,
|
|
GWBUF* readbuf,
|
|
int nbytes_to_process) /*< number of new bytes read */
|
|
{
|
|
int npackets_left = 0; /*< response's packet count */
|
|
size_t nbytes_left = 0; /*< nbytes to be read for the packet */
|
|
MySQLProtocol* p;
|
|
GWBUF* outbuf = NULL;
|
|
|
|
/** Get command which was stored in gw_MySQLWrite_backend */
|
|
p = DCB_PROTOCOL(dcb, MySQLProtocol);
|
|
CHK_PROTOCOL(p);
|
|
|
|
/** All buffers processed here are sescmd responses */
|
|
gwbuf_set_type(readbuf, GWBUF_TYPE_SESCMD_RESPONSE);
|
|
|
|
/**
|
|
* Now it is known how many packets there should be and how much
|
|
* is read earlier.
|
|
*/
|
|
while (nbytes_to_process != 0)
|
|
{
|
|
mysql_server_cmd_t srvcmd;
|
|
bool succp;
|
|
|
|
srvcmd = protocol_get_srv_command(p, false);
|
|
|
|
/**
|
|
* Read values from protocol structure, fails if values are
|
|
* uninitialized.
|
|
*/
|
|
if (npackets_left == 0)
|
|
{
|
|
succp = protocol_get_response_status(p, &npackets_left, &nbytes_left);
|
|
|
|
if (!succp || npackets_left == 0)
|
|
{
|
|
/**
|
|
* Examine command type and the readbuf. Conclude response
|
|
* packet count from the command type or from the first
|
|
* packet content. Fails if read buffer doesn't include
|
|
* enough data to read the packet length.
|
|
*/
|
|
init_response_status(readbuf, srvcmd, &npackets_left, &nbytes_left);
|
|
}
|
|
}
|
|
/** Only session commands with responses should be processed */
|
|
ss_dassert(npackets_left > 0);
|
|
|
|
/** Read incomplete packet. */
|
|
if (nbytes_left > nbytes_to_process)
|
|
{
|
|
/** Includes length info so it can be processed */
|
|
if (nbytes_to_process >= 5)
|
|
{
|
|
/** discard source buffer */
|
|
readbuf = gwbuf_consume(readbuf, GWBUF_LENGTH(readbuf));
|
|
nbytes_left -= nbytes_to_process;
|
|
}
|
|
nbytes_to_process = 0;
|
|
}
|
|
/** Packet was read. All bytes belonged to the last packet. */
|
|
else if (nbytes_left == nbytes_to_process)
|
|
{
|
|
nbytes_left = 0;
|
|
nbytes_to_process = 0;
|
|
ss_dassert(npackets_left > 0);
|
|
npackets_left -= 1;
|
|
outbuf = gwbuf_append(outbuf, readbuf);
|
|
readbuf = NULL;
|
|
}
|
|
/**
|
|
* Packet was read. There should be more since bytes were
|
|
* left over.
|
|
* Move the next packet to its own buffer and add that next
|
|
* to the prev packet's buffer.
|
|
*/
|
|
else /*< nbytes_left < nbytes_to_process */
|
|
{
|
|
nbytes_to_process -= nbytes_left;
|
|
|
|
/** Move the prefix of the buffer to outbuf from redbuf */
|
|
outbuf = gwbuf_append(outbuf, gwbuf_clone_portion(readbuf, 0, nbytes_left));
|
|
readbuf = gwbuf_consume(readbuf, nbytes_left);
|
|
ss_dassert(npackets_left > 0);
|
|
npackets_left -= 1;
|
|
nbytes_left = 0;
|
|
}
|
|
|
|
/** Store new status to protocol structure */
|
|
protocol_set_response_status(p, npackets_left, nbytes_left);
|
|
|
|
/** A complete packet was read */
|
|
if (nbytes_left == 0)
|
|
{
|
|
/** No more packets in this response */
|
|
if (npackets_left == 0)
|
|
{
|
|
GWBUF* b = outbuf;
|
|
|
|
while (b->next != NULL)
|
|
{
|
|
b = b->next;
|
|
}
|
|
/** Mark last as end of response */
|
|
gwbuf_set_type(b, GWBUF_TYPE_RESPONSE_END);
|
|
|
|
/** Archive the command */
|
|
protocol_archive_srv_command(p);
|
|
}
|
|
/** Read next packet */
|
|
else
|
|
{
|
|
uint8_t* data;
|
|
|
|
/** Read next packet length */
|
|
data = GWBUF_DATA(readbuf);
|
|
nbytes_left = MYSQL_GET_PACKET_LEN(data)+MYSQL_HEADER_LEN;
|
|
/** Store new status to protocol structure */
|
|
protocol_set_response_status(p, npackets_left, nbytes_left);
|
|
}
|
|
}
|
|
}
|
|
return outbuf;
|
|
}
|