385 lines
8.8 KiB
C
385 lines
8.8 KiB
C
/*
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* This file is distributed as part of MaxScale. 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 2014
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <dcb.h>
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#include <buffer.h>
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#include <service.h>
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#include <session.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <router.h>
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#include <poll.h>
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#include <atomic.h>
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#include <gw.h>
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#include <adminusers.h>
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#include <skygw_utils.h>
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#include <log_manager.h>
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#include <modinfo.h>
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#include <maxscaled.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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"A maxscale protocol for the administration interface"
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};
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extern int lm_enabled_logfiles_bitmask;
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/**
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* @file maxscaled.c - MaxScale administration protocol
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*
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*
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* @verbatim
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* Revision History
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* Date Who Description
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* 13/06/2014 Mark Riddoch Initial implementation
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*
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* @endverbatim
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*/
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static char *version_str = "V1.0.0";
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static int maxscaled_read_event(DCB* dcb);
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static int maxscaled_write_event(DCB *dcb);
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static int maxscaled_write(DCB *dcb, GWBUF *queue);
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static int maxscaled_error(DCB *dcb);
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static int maxscaled_hangup(DCB *dcb);
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static int maxscaled_accept(DCB *dcb);
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static int maxscaled_close(DCB *dcb);
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static int maxscaled_listen(DCB *dcb, char *config);
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/**
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* The "module object" for the maxscaled protocol module.
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*/
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static GWPROTOCOL MyObject = {
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maxscaled_read_event, /**< Read - EPOLLIN handler */
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maxscaled_write, /**< Write - data from gateway */
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maxscaled_write_event, /**< WriteReady - EPOLLOUT handler */
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maxscaled_error, /**< Error - EPOLLERR handler */
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maxscaled_hangup, /**< HangUp - EPOLLHUP handler */
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maxscaled_accept, /**< Accept */
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NULL, /**< Connect */
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maxscaled_close, /**< Close */
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maxscaled_listen, /**< Create a listener */
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NULL, /**< 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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LOGIF(LT, (skygw_log_write(
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LOGFILE_TRACE,
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"Initialise MaxScaled Protocol module.\n")));
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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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/**
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* Read event for EPOLLIN on the maxscaled protocol module.
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*
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* @param dcb The descriptor control block
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* @return
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*/
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static int
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maxscaled_read_event(DCB* dcb)
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{
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int n;
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GWBUF *head = NULL;
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SESSION *session = dcb->session;
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MAXSCALED *maxscaled = (MAXSCALED *)dcb->protocol;
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char *password;
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if ((n = dcb_read(dcb, &head)) != -1)
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{
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if (head)
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{
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unsigned char *ptr = GWBUF_DATA(head);
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ptr = GWBUF_DATA(head);
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if (GWBUF_LENGTH(head))
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{
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switch (maxscaled->state)
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{
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case MAXSCALED_STATE_LOGIN:
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maxscaled->username = strndup(GWBUF_DATA(head), GWBUF_LENGTH(head));
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maxscaled->state = MAXSCALED_STATE_PASSWD;
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dcb_printf(dcb, "PASSWORD");
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gwbuf_consume(head, GWBUF_LENGTH(head));
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break;
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case MAXSCALED_STATE_PASSWD:
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password = strndup(GWBUF_DATA(head), GWBUF_LENGTH(head));
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if (admin_verify(maxscaled->username, password))
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{
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dcb_printf(dcb, "OK----");
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maxscaled->state = MAXSCALED_STATE_DATA;
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}
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else
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{
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dcb_printf(dcb, "FAILED");
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maxscaled->state = MAXSCALED_STATE_LOGIN;
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free(maxscaled->username);
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}
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gwbuf_consume(head, GWBUF_LENGTH(head));
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free(password);
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break;
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case MAXSCALED_STATE_DATA:
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SESSION_ROUTE_QUERY(session, head);
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dcb_printf(dcb, "OK");
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break;
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}
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}
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else
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{
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// Force the free of the buffer header
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gwbuf_consume(head, 0);
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}
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}
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}
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return n;
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}
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/**
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* EPOLLOUT handler for the maxscaled protocol module.
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*
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* @param dcb The descriptor control block
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* @return
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*/
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static int
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maxscaled_write_event(DCB *dcb)
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{
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return dcb_drain_writeq(dcb);
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}
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/**
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* Write routine for the maxscaled protocol module.
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*
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* Writes the content of the buffer queue to the socket
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* observing the non-blocking principles of MaxScale.
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*
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* @param dcb Descriptor Control Block for the socket
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* @param queue Linked list of buffes to write
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*/
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static int
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maxscaled_write(DCB *dcb, GWBUF *queue)
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{
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int rc;
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rc = dcb_write(dcb, queue);
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return rc;
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}
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/**
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* Handler for the EPOLLERR event.
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*
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* @param dcb The descriptor control block
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*/
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static int
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maxscaled_error(DCB *dcb)
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{
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return 0;
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}
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/**
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* Handler for the EPOLLHUP event.
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*
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* @param dcb The descriptor control block
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*/
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static int
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maxscaled_hangup(DCB *dcb)
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{
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dcb_close(dcb);
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return 0;
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}
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/**
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* Handler for the EPOLLIN event when the DCB refers to the listening
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* socket for the protocol.
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*
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* @param dcb The descriptor control block
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* @return The number of new connections created
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*/
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static int
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maxscaled_accept(DCB *dcb)
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{
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int n_connect = 0;
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while (1)
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{
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int so;
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struct sockaddr_in addr;
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socklen_t addrlen = sizeof(struct sockaddr);
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DCB *client_dcb;
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MAXSCALED *maxscaled_pr = NULL;
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so = accept(dcb->fd, (struct sockaddr *)&addr, &addrlen);
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if (so == -1)
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return n_connect;
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else
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{
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atomic_add(&dcb->stats.n_accepts, 1);
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client_dcb = dcb_alloc(DCB_ROLE_REQUEST_HANDLER);
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if (client_dcb == NULL)
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{
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return n_connect;
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}
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client_dcb->fd = so;
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client_dcb->remote = strdup(inet_ntoa(addr.sin_addr));
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memcpy(&client_dcb->func, &MyObject, sizeof(GWPROTOCOL));
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client_dcb->session =
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session_alloc(dcb->session->service, client_dcb);
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maxscaled_pr = (MAXSCALED *)malloc(sizeof(MAXSCALED));
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client_dcb->protocol = (void *)maxscaled_pr;
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if (maxscaled_pr == NULL)
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{
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dcb_add_to_zombieslist(client_dcb);
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return n_connect;
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}
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if (poll_add_dcb(client_dcb) == -1)
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{
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dcb_add_to_zombieslist(dcb);
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return n_connect;
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}
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n_connect++;
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maxscaled_pr->state = MAXSCALED_STATE_LOGIN;
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maxscaled_pr->username = NULL;
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dcb_printf(client_dcb, "USER");
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}
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}
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return n_connect;
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}
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/**
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* The close handler for the descriptor. Called by the gateway to
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* explicitly close a connection.
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*
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* @param dcb The descriptor control block
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*/
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static int
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maxscaled_close(DCB *dcb)
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{
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MAXSCALED *maxscaled = dcb->protocol;
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if (maxscaled && maxscaled->username)
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{
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free(maxscaled->username);
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maxscaled->username = NULL;
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}
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return 0;
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}
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/**
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* Maxscale daemon listener entry point
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*
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* @param listener The Listener DCB
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* @param config Configuration (ip:port)
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*/
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static int
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maxscaled_listen(DCB *listener, char *config)
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{
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struct sockaddr_in addr;
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int one = 1;
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int rc;
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memcpy(&listener->func, &MyObject, sizeof(GWPROTOCOL));
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if (!parse_bindconfig(config, 6033, &addr))
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return 0;
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if ((listener->fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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{
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return 0;
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}
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// socket options
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setsockopt(listener->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
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// set NONBLOCKING mode
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setnonblocking(listener->fd);
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// bind address and port
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if (bind(listener->fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
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{
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return 0;
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}
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rc = listen(listener->fd, SOMAXCONN);
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if (rc == 0) {
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LOGIF(LD, (skygw_log_write(
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LOGFILE_DEBUG,
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"Listening maxscale connections at %s\n",
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config)));
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} else {
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int eno = errno;
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errno = 0;
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LOGIF(LE, (skygw_log_write(
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LOGFILE_ERROR,
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"Failed to start listening for maxscale admin connections "
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"due error %d, %s\n\n",
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eno,
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strerror(eno))));
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return 0;
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}
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if (poll_add_dcb(listener) == -1)
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{
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return 0;
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}
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return 1;
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}
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