640 lines
16 KiB
C++
640 lines
16 KiB
C++
/***********************************************************************
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*
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* Copyright (C) 2006 Novell, Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; version 2.1
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* of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, Novell, Inc.
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*
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* To contact Novell about this file by physical or electronic mail,
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* you may find current contact information at www.novell.com.
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*
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* Author: Juan Carlos Luciani <jluciani@novell.com>
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*
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***********************************************************************/
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//===[ Include files ]=====================================================
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#include "internal.h"
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//===[ External data ]=====================================================
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//===[ External prototypes ]===============================================
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//===[ Manifest constants ]================================================
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#define MAXFD 64
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#define DOMAIN_SOCKET_FILE_NAME "/var/CASA/authtoken/validate/socket"
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//===[ Type definitions ]==================================================
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//===[ Function prototypes ]===============================================
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void*
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WorkerThread(void*);
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//===[ Global variables ]==================================================
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// Usage string
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char usage[] = "\nCasaAuthtokenValidateD: usage: [-p ListenPort] [-b BeginThreads] [-g GrowThreads] [-m MaxThreads] [-D DebugLevel] [-d]\n";
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// Worker thread pool configuration parameters
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int beginThreads = 5;
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int growThreads = 5;
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int maxThreads = 4096;
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int minWaitingThreads = beginThreads;
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// Worker thread pool operating parameters
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double numThreads = 0;
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double numBusyThreads = 0;
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// Listen Port Number
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int listenPortNumber = 5000;
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//int listenPortNumber = 0;
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// Parameter indicating whether or not XSrv needs to run
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// as a daemon.
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bool daemonize = false;
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// Name to use for logging purposes
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char appName[] = "CasaAuthtokenValidateD";
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// Debug Level
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int DebugLevel = 3;
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bool UseSyslog = false;
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// Variables for daemon auto-restart after crash feature
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static bool autoRestartAfterCrash = true;
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// Synchronization variables
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pthread_mutex_t interlockedMutex;
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pthread_mutex_t serverMutex;
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pthread_cond_t serverCondition;
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// Operating parameters
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bool terminating = false;
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//++=======================================================================
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void
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GrowWorkerThreadPool(int growNumber)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes: The serverMutex needs to be held when calling this
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// procedure.
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//
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// L0
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//=======================================================================--
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{
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DbgTrace(1, "GrowWorkerThreadPool- Start\n", 0);
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for (int i = 0; i < growNumber; i++)
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{
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int threadCreateStatus;
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pthread_t thread;
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if ((threadCreateStatus = pthread_create(&thread,
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NULL,
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(void*(*)(void*))WorkerThread,
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NULL) == 0))
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{
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// Worker thread created
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numThreads ++;
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}
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else
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{
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DbgTrace(0, "GrowWorkerThreadPool- Thread creation failed, status = %0d\n", threadCreateStatus);
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}
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}
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// Let our server know if we ended up with no worker threads
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if (numThreads == 0)
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pthread_cond_signal(&serverCondition);
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DbgTrace(1, "GrowWorkerThreadPool- End\n", 0);
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} /*-- GrowWorkerThreadPool() --*/
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//++=======================================================================
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void
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WorkerThreadBusy(void)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L0
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//=======================================================================--
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{
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DbgTrace(1, "WorkerThreadBusy- Start\n", 0);
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// Acquire our mutex
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pthread_mutex_lock(&serverMutex);
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// Increment the numBusyThread count and grow the number of worker threads
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// if necessary.
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numBusyThreads ++;
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if ((numThreads - numBusyThreads) < minWaitingThreads)
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GrowWorkerThreadPool(growThreads);
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// Release our mutex
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pthread_mutex_unlock(&serverMutex);
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DbgTrace(1, "WorkerThreadBusy- End\n", 0);
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} /*-- WorkerThreadBusy() --*/
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//++=======================================================================
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bool
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WorkerThreadWaiting(void)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L0
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//=======================================================================--
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{
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bool retValue;
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DbgTrace(1, "WorkerThreadWaiting- Start\n", 0);
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// Acquire our mutex
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pthread_mutex_lock(&serverMutex);
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// Decrement the numBusyThread count and determine if there are
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// too many of us laying around.
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numBusyThreads --;
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if ((numThreads - numBusyThreads) > minWaitingThreads
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&& ((numBusyThreads + growThreads) / numThreads) < 0.33 )
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retValue = true;
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else
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retValue = false;
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// Release our mutex
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pthread_mutex_unlock(&serverMutex);
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DbgTrace(1, "WorkerThreadWaiting- End, retValue = %X\n", retValue);
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return retValue;
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} /*-- WorkerThreadWaiting() --*/
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//++=======================================================================
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void*
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WorkerThread(void*)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L0
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//=======================================================================--
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{
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DbgTrace(1, "WorkerThread- Start\n", 0);
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// Set the thread in the detached state so that it is cleaned up when it exits
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pthread_detach(pthread_self());
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// Loop until told to terminate
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while (!terminating)
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{
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// Get a request that needs servicing
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int32_t requestId = IpcServerGetRequest();
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if (requestId != 0)
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{
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// We got a request that needs servicing, now get the
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// data associated with it.
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char *pReqData;
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int dataLen = IpcServerGetRequestData(requestId, &pReqData);
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if (dataLen != 0)
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{
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// Indicate that we are now busy
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WorkerThreadBusy();
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// Just echo the data back as the reply
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IpcServerCompleteRequest(requestId, pReqData);
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// Indicate that we are no longer busy and get indication of
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// whether or not we should continue to try to process requests.
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if (WorkerThreadWaiting() == true)
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{
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DbgTrace(1, "WorkerThread- Requested to terminate\n", 0);
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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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DbgTrace(0, "WorkerThread- Error obtaining Request data\n", 0);
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IpcServerAbortRequest(requestId);
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}
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}
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else
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{
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// No need to service requests any longer
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break;
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}
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}
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// Decrement the number of worker threads and signal our main thread
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// to terminate itself if we are the last worker thread.
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pthread_mutex_lock(&serverMutex);
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numThreads --;
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if (numThreads == 0)
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pthread_cond_signal(&serverCondition);
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pthread_mutex_unlock(&serverMutex);
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DbgTrace(1, "WorkerThread- End\n", 0);
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// Exit
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pthread_exit(NULL);
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return 0; // never-reached!
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} /*-- WorkerThread() --*/
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//++=======================================================================
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void
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SigTermHandler(
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int signum)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L2
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//=======================================================================--
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{
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DbgTrace(1, "SigTermHandler- Start\n", 0);
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// Indicate that we are terminating
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terminating = true;
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// Shutdown the IPC Server
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IpcServerShutdown();
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DbgTrace(1, "SigTermHandler- End\n", 0);
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} /*-- SigTermHandler() --*/
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//++=======================================================================
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void
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DaemonInit(
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const char *pname)
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes: Copy of daemon_init() in Richard Stevens Unix Network
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// Programming Book.
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//
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// L0
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//=======================================================================--
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{
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pid_t pid;
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char *pNoAutoRestartEnvvar;
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DbgTrace(1, "DaemonInit- Start\n", 0);
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// Determine if we need to disable the auto-restart after crash feature
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if ((pNoAutoRestartEnvvar = getenv("CASA_NO_AUTORESTART_AFTER_CRASH")) != NULL
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&& strcmp(pNoAutoRestartEnvvar, "0") != 0)
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{
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DbgTrace(1, "DaemonInit- Disabling daemon auto-restart after crash feature\n", 0);
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autoRestartAfterCrash = false;
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}
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// Fork to run in the background, check for error.
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if ((pid = fork()) == -1)
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{
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DbgTrace(0, "DaemonInit- Fork error = %d\n", errno);
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exit(0);
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}
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else if (pid != 0)
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{
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// The fork succeeded and we are the parent process, terminate
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// ourselves.
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exit(0);
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}
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/* 1st child continues */
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// Become the session leader and set to ignore SIGHUP
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setsid();
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signal(SIGHUP, SIG_IGN);
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// Fork again to guarantee that the daemon can not acquire a
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// controlling terminal.
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if ((pid = fork()) == -1)
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{
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DbgTrace(0, "DaemonInit- Fork error = %d\n", errno);
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exit(0);
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}
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else if (pid != 0)
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{
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// The fork succeeded and we are the parent process, terminate
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// ourselves.
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exit(0);
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}
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/* 2nd child continues */
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// Close any open descriptors
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for (int i = 0; i < MAXFD; i++)
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close(i);
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// Spawn a worker
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if ((pid = fork()) == -1)
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{
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DbgTrace(0, "DaemonInit- Fork error = %d\n", errno);
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exit(0);
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}
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else if (pid == 0)
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{
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// The fork succeeded and we are the worker, continue.
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}
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else
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{
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// We are the parent of the server, check if we must execute the auto-restart
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// server after crash logic.
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if (autoRestartAfterCrash)
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{
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// Execute auto-restart server after crash logic
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while (1)
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{
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int childExitStatus;
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// Wait for children to exit
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pid = wait(&childExitStatus);
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if (pid != -1)
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{
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// Fork worker
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if ((pid = fork()) == -1)
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{
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DbgTrace(0, "DaemonInit- Fork error = %d\n", errno);
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exit(0);
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}
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else if (pid == 0)
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{
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// The fork succeeded and we are the server, exit the loop
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// to start.
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goto childContinue;
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}
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// We are the parent process, continue to watch for a terminated child process.
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syslog(LOG_USER | LOG_INFO, "CasaAuthtokenValidateD: Worker re-started after it terminated unexpectedly");
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sleep(1); // To keep from consuming too many cycles
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}
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else
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{
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// Check if we must exit the loop
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if (errno != EINTR)
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break;
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}
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}
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}
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// Terminate ourselves.
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exit(0);
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}
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childContinue:
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// Set flag to inform DbgTrace macros to use Syslog
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UseSyslog = true;
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// Change the working directory
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chdir("/var/CASA/authtoken/validate");
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// Clear our file mode creation mask
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umask(0);
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// Get ready to log
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openlog(appName, LOG_CONS | LOG_NOWAIT | LOG_ODELAY| LOG_PID, LOG_USER);
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if (DebugLevel == 0)
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setlogmask(LOG_UPTO(LOG_INFO));
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else
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setlogmask(LOG_UPTO(LOG_DEBUG));
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DbgTrace(1, "DaemonInit- End\n", 0);
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} /*-- DaemonInit() --*/
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//++=======================================================================
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int
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main(
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int argc,
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char* argv[])
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//
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// Arguments:
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//
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// Returns:
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//
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// Abstract:
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//
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// Notes:
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//
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// L0
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//=======================================================================--
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{
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int optionsSpecified = 0;
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bool doneScanning = false;
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bool invalidOption = false;
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int option;
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//printf("**** AuthTokenValidate Daemon ****\n");
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// Scan through the options specified
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while (!doneScanning)
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{
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opterr = 0;
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option = getopt(argc, argv, "m:p:b:g:D:d");
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// Proceed based on the result
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switch (option)
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{
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case 'p':
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// Port number option, record location of
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// argument.
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listenPortNumber = atoi(optarg);
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optionsSpecified ++;
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break;
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case 'b':
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// Begin threads option, override the default parameter
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// with the value of the option.
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beginThreads = atoi(optarg);
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optionsSpecified ++;
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break;
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case 'g':
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// Grow threads option, override the default parameter
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// with the value of the option.
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growThreads = atoi(optarg);
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optionsSpecified ++;
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break;
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case 'm':
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// Max threads option, override the default parameter
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// with the value of the option.
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maxThreads = atoi(optarg);
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optionsSpecified ++;
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break;
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case 'd':
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// Run as daemon option
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daemonize = true;
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optionsSpecified ++;
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break;
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case 'D':
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// Set the debug level
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DebugLevel = atoi(optarg);
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optionsSpecified++;
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break;
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case '?':
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// Invalid option detected
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doneScanning = true;
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invalidOption = true;
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break;
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default:
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// Done scanning
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doneScanning = true;
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break;
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}
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}
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// Do some sanity checking
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if (!invalidOption
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&& beginThreads > 0
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&& maxThreads > (growThreads+beginThreads)
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&& beginThreads <= maxThreads)
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{
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// The server is ready to start, check if we must
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// run it as a daemon.
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if (daemonize)
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DaemonInit(argv[0]);
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// Set a handler for SIGTERM
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signal(SIGTERM, SigTermHandler);
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// Initialize our mutexes
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pthread_mutex_init(&interlockedMutex, NULL);
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pthread_mutex_init(&serverMutex, NULL);
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// Initialize the condition that we will use to wait
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// for the exit of all of our worker threads.
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if (pthread_cond_init(&serverCondition, NULL) == 0)
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{
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// Initialize the IPC Server
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if (IpcServerInit(appName,
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DebugLevel,
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UseSyslog) == 0)
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{
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// Now setup the appropriate listen address
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int setAddressResult;
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if (listenPortNumber == 0)
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setAddressResult = IpcServerSetUnAddress(DOMAIN_SOCKET_FILE_NAME);
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else
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setAddressResult = IpcServerSetInAddress(listenPortNumber);
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if (setAddressResult == 0)
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{
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// Now start the IPC server
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if (IpcServerStart() == 0)
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{
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// Acquire our mutex
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pthread_mutex_lock(&serverMutex);
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// Start worker threads
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GrowWorkerThreadPool(beginThreads);
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// Wait for the worker threads to terminate
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pthread_cond_wait(&serverCondition, &serverMutex);
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// Release our mutex
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pthread_mutex_unlock(&serverMutex);
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}
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}
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else
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{
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DbgTrace(0, "main- Setting of listen address failed\n", 0);
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}
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}
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else
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{
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DbgTrace(0, "main- Initialization of Ipc server failed\n", 0);
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}
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}
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else
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{
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DbgTrace(0, "main- Condition initialization failed\n", 0);
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}
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}
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else
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{
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// Invalid option detected or the user failed to
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// specify the listening port number.
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printf(usage, argv[0]);
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}
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return 0;
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} /*-- main() --*/
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//=========================================================================
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//=========================================================================
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|