pssecret.cxx

SIP（Session Initiation Protocol）是由IETF定义

/* ====================================================================
 * The Vovida Software License, Version 1.0 
 * 
 * Copyright (c) 2000 Vovida Networks, Inc.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The names "VOCAL", "Vovida Open Communication Application Library",
 *    and "Vovida Open Communication Application Library (VOCAL)" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 4. Products derived from this software may not be called "VOCAL", nor
 *    may "VOCAL" appear in their name, without prior written
 *    permission of Vovida Networks, Inc.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
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 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
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 * ====================================================================
 * 
 * This software consists of voluntary contributions made by Vovida
 * Networks, Inc. and many individuals on behalf of Vovida Networks,
 * Inc.  For more information on Vovida Networks, Inc., please see
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static const char* const PSSecret_cxx_Version =
    "$Id: PSSecret.cxx,v 1.2.2.1 2003/03/13 17:46:12 bko Exp $";

#include "PSSecret.hxx"
#include <fstream>
#include "cpLog.h"
#include "vocalconfig.h"
#include "Lock.hxx"
#include "VIoException.hxx"
#include "FileStat.hxx"

using Vocal::IO::FileStat;

PSSecret* PSSecret::instance_ = 0;

PSSecret::PSSecret()
    :myReadLastModified(0),
     myWriteLastModified(0)
{
}


void PSSecret::create(const char* readFile, const char* writeFile)
{
    if(!instance_)
    {
        instance_ = new PSSecret;
    }

    instance_->myReadFile = readFile;
    instance_->myWriteFile = writeFile;

    instance_->update(true);

    assert(instance_);
}


Data PSSecret::readEntry(const char* filename, const char* user) throw (VException& )
{
    Data tmp;

    // need to read the data
    std::ifstream openFile(filename);
    
    if(!openFile)
    {
        // do something
        throw VIoException("failed to read file", __FILE__, __LINE__, 0);
    }
        
    char buf[256];
    while(openFile && !openFile.eof())
    {
        openFile.getline(buf, 256);
        buf[255] = '\0';
            
        if(strncmp(buf, user, 6) == 0)
        {
            tmp = buf;
        }
    }

    openFile.close();
    if(tmp == "")
    {
        cpLog(LOG_ERR, "could not find an entry for %s in %s", user, filename);
    }
    else
    {
        cpLog(LOG_DEBUG, "found user %s in file %s", user, filename);
    }
    return tmp;
}


void PSSecret::update(bool force)
{
    Vocal::Threads::Lock x(myMutex);

    FileStat readStat(myReadFile);

    if(force || (readStat.lastModified() > myReadLastModified))
    {
        cpLog(LOG_DEBUG_STACK, "trying to read file: %s", myReadFile.c_str());

        // do this if the file has changed
        try
        {
            myReadSecret = readEntry(myReadFile.c_str(), "reader:");
            myReadLastModified = readStat.lastModified();
        }
        catch (VException& e)
        {
            cpLog(LOG_ERR, "failed to read reader password from %s (cannot get data from pserver)",
                  myReadFile.c_str());
            myReadSecret = "";
        }
    }
    else
    {
        cpLog(LOG_DEBUG_STACK, "skipping rereading %s because up to date",
              myReadFile.c_str());
    }

    FileStat writeStat(myWriteFile);
    if(force || (writeStat.lastModified() > myWriteLastModified))
    {
        cpLog(LOG_DEBUG_STACK, "trying to read file: %s", myWriteFile.c_str());
        try
        {
            myWriteSecret = readEntry(myWriteFile.c_str(), "vocal:");
            myWriteLastModified = writeStat.lastModified();
        }
        catch (VException& e)
        {
            cpLog(LOG_DEBUG, "failed to read writer password from %s (cannot synchronize redundant pservers)",
                  myReadFile.c_str());
            myWriteSecret = "";
        }
    }
    else
    {
        cpLog(LOG_DEBUG_STACK, "skipping rereading %s because up to date",
              myWriteFile.c_str());
    }
}


Data PSSecret::readSecret()
{
    if(!instance_)
    {
        cpLog(LOG_ALERT, "you should not create PSSecret from scratch! -- you must instantiate first");
        assert(0);
//        exit(-1);
        PSSecret::create(VOCAL_INSTALL_PATH "/etc/vocal.secret", VOCAL_INSTALL_PATH "/etc/vocal.secret"); // xxx we should read from the vocal.conf file
    }
    instance_->update(false);
    LocalScopeAllocator lo;
    cpLog(LOG_DEBUG_STACK, "read secret: %s", instance_->myReadSecret.getData(lo));
    if(instance_->myReadSecret == "")
    {
        cpLog(LOG_ERR, "read secret is empty!");
    }
    return instance_->myReadSecret;
}


Data PSSecret::writeSecret()
{
    if(!instance_)
    {
        cpLog(LOG_ALERT, "you should not create PSSecret from scratch! -- you must instantiate first");
        assert(0);
//        exit(-1);
        PSSecret::create(VOCAL_INSTALL_PATH "/etc/vocal.secret", VOCAL_INSTALL_PATH "/etc/vocal.secret"); // xxx we should read from the vocal.conf file
    }
    instance_->update(false);
    LocalScopeAllocator lo;
    cpLog(LOG_DEBUG_STACK, "write secret: %s", instance_->myWriteSecret.getData(lo));
    if(instance_->myWriteSecret == "")
    {
        cpLog(LOG_DEBUG, "write secret is empty!");
    }
    return instance_->myWriteSecret;
}


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