filestub.c

支持SSL v2/v3, TLS, PKCS #5, PKCS #7, PKCS #11, PKCS #12, S/MIME, X.509v3证书等安全协议或标准的开发库编译用到NSPR

/* 
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape security libraries.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1994-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */
#define CMD_STUB 1	/* this is just a stub for security/cmd/*  */
#define MOZ_LITE 1	/* don't need that other stuff, either */

#if 0
#include "stdafx.h"
#include "dialog.h"
#include "mainfrm.h"
#include "custom.h"
#include "shcut.h"
#include "edt.h"
#include "prmon.h"
#include "fegui.h"
#include "prefapi.h"
#include <io.h>
#include "secrng.h"
#include "mailass.h"
#include "ipframe.h"
#include "mnprefs.h"

#else

#include <xp_core.h>
#include <xp_file.h>
#include <xp_mcom.h>

#define ASSERT assert
#endif

#ifdef XP_MAC
#include "prpriv.h" /* For PR_NewNamedMonitor */
#else
#include "private/prpriv.h"
#endif

#ifdef XP_WIN

#ifndef _AFXDLL
/* MSVC Debugging new...goes to regular new in release mode */
#define new DEBUG_NEW  
#endif

#ifdef __BORLANDC__
    #define _lseek lseek
#endif
       
#define WIDTHBYTES(i) ((i + 31) / 32 * 4)
#define MAXREAD 32767
       
MODULE_PRIVATE char * XP_CacheFileName();

#define MAXSTRINGLEN 8192 

#ifndef CMD_STUB

/* Return a string the same as the In string 
** but with all of the \n's replaced with \r\n's  
*/
MODULE_PRIVATE char * 
FE_Windowsify(const char * In)
{
    char *Out;
    char *o, *i; 
    int32 len;

    if(!In)
        return NULL;

    /* if every character is a \n then new string is twice as long */
    len = (int32) XP_STRLEN(In) * 2 + 1;
    Out = (char *) XP_ALLOC(len);
    if(!Out)
        return NULL;

  /* Move the characters over one by one.  If the current character is */
  /*  a \n replace add a \r before moving the \n over */
    for(i = (char *) In, o = Out; i && *i; *o++ = *i++)
       if(*i == '\n')
            *o++ = '\r';

    /* Make sure our new string is NULL terminated */
    *o = '\0';
    return(Out);
}


/*  Return some adjusted out full path on the mac. */
/*  For windows, we just return what was passed in. */
/*  We must provide it in a seperate buffer, otherwise they might change */
/*      the original and change also what they believe to be saved. */
char *
WH_FilePlatformName(const char *pName)    
{

    if(pName)   {
        return XP_STRDUP(pName);
    }
    
    return NULL;
}


char *
FE_GetProgramDirectory(char *buffer, int length)
{
    ::GetModuleFileName(theApp.m_hInstance, buffer, length);

    /*	Find the trailing slash. */
    char *pSlash = ::strrchr(buffer, '\\');
    if(pSlash)	{
	*(pSlash+1) = '\0';
    } else {
	buffer[0] = '\0';
    }
    return (buffer);
}


char*
XP_TempDirName(void)
{
    char *tmp = theApp.m_pTempDir;
    if (!tmp)
        return XP_STRDUP(".");
    return XP_STRDUP(tmp);
}

/* Windows _tempnam() lets the TMP environment variable override things sent 
** in so it look like we're going to have to make a temp name by hand.

** The user should *NOT* free the returned string.  
** It is stored in static space 
** and so is not valid across multiple calls to this function.

** The names generated look like 
**   c:\netscape\cache\m0.moz 
**   c:\netscape\cache\m1.moz 
** up to... 
**   c:\netscape\cache\m9999999.moz 
** after that if fails 
** */
PUBLIC char *
xp_TempFileName(int type, const char * request_prefix, const char * extension,
				char* file_buf)
{
    const char * directory = NULL; 
    char * ext = NULL;           /* file extension if any */
    char * prefix = NULL;        /* file prefix if any */
  
  
    XP_StatStruct statinfo;
    int status;     

    /* */
    /* based on the type of request determine what directory we should be */
    /*   looking into */
    /*   */
    switch(type) {
    case xpCache:
        directory = theApp.m_pCacheDir;
        ext = ".MOZ";
        prefix = CACHE_PREFIX;
        break;
#ifndef MOZ_LITE        
    case xpSNewsRC:
    case xpNewsRC:
    case xpNewsgroups:
    case xpSNewsgroups:
    case xpTemporaryNewsRC:
        directory = g_MsgPrefs.m_csNewsDir;
        ext = (char *)extension;
        prefix = (char *)request_prefix;
        break;
    case xpMailFolderSummary:
    case xpMailFolder:
	directory = g_MsgPrefs.m_csMailDir;
        ext = (char *)extension;
        prefix = (char *)request_prefix;
	break;
    case xpAddrBook:
	/*changed to support multi-profile */
	/*directory = theApp.m_pInstallDir->GetCharValue(); */
	directory = (const char *)theApp.m_UserDirectory;
	if ((request_prefix == 0) || (XP_STRLEN (request_prefix) == 0))
		prefix = "abook";
	ext = ".nab";
	break;
#endif /* MOZ_LITE       */
    case xpCacheFAT:
	directory = theApp.m_pCacheDir;
	prefix = "fat";
	ext = "db";
	break;
    case xpJPEGFile:
        directory = theApp.m_pTempDir;
	ext = ".jpg";
        prefix = (char *)request_prefix;
	break;
    case xpPKCS12File:
	directory = theApp.m_pTempDir;
	ext = ".p12";
	prefix = (char *)request_prefix;
	break;
    case xpTemporary:
    default:
        directory = theApp.m_pTempDir;
        ext = (char *)extension;
        prefix = (char *)request_prefix;
        break;
    }

    if(!directory)
        return(NULL);

    if(!prefix)
        prefix = "X";

    if(!ext)
        ext = ".TMP";

  /*  We need to base our temporary file names on time, and not on sequential */
  /*    addition because of the cache not being updated when the user */
  /*    crashes and files that have been deleted are over written with */
  /*    other files; bad data. */
  /*  The 52 valid DOS file name characters are */
  /*    0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_^$~!#%&-{}@`'() */
  /*  We will only be using the first 32 of the choices. */
  /* */
  /*  Time name format will be M+++++++.MOZ */
  /*    Where M is the single letter prefix (can be longer....) */
  /*    Where +++++++ is the 7 character time representation (a full 8.3 */
  /*      file name will be made). */
  /*    Where .MOZ is the file extension to be used. */
  /* */
  /*  In the event that the time requested is the same time as the last call */
  /*    to this function, then the current time is incremented by one, */
  /*    as is the last time called to facilitate unique file names. */
  /*  In the event that the invented file name already exists (can't */
  /*    really happen statistically unless the clock is messed up or we */
  /*    manually incremented the time), then the times are incremented */
  /*    until an open name can be found. */
  /* */
  /*  time_t (the time) has 32 bits, or 4,294,967,296 combinations. */
  /*  We will map the 32 bits into the 7 possible characters as follows: */
  /*    Starting with the lsb, sets of 5 bits (32 values) will be mapped */
  /*      over to the appropriate file name character, and then */
  /*      incremented to an approprate file name character. */
  /*    The left over 2 bits will be mapped into the seventh file name */
  /*      character. */
  /* */
    
    int i_letter, i_timechars, i_numtries = 0;
    char ca_time[8];
    time_t this_call = (time_t)0;
    
    /*  We have to base the length of our time string on the length */
    /*    of the incoming prefix.... */
    /* */
    i_timechars = 8 - strlen(prefix);
    
    /*  Infinite loop until the conditions are satisfied. */
    /*  There is no danger, unless every possible file name is used. */
    /* */
    while(1)    {
        /*    We used to use the time to generate this. */
        /*    Now, we use some crypto to avoid bug #47027 */
        RNG_GenerateGlobalRandomBytes((void *)&this_call, sizeof(this_call));

        /*  Convert the time into a 7 character string. */
        /*  Strip only the signifigant 5 bits. */
        /*  We'll want to reverse the string to make it look coherent */
        /*    in a directory of file names. */
        /* */
        for(i_letter = 0; i_letter < i_timechars; i_letter++) {
            ca_time[i_letter] = (char)((this_call >> (i_letter * 5)) & 0x1F);
            
          /*  Convert any numbers to their equivalent ascii code */
          /* */
            if(ca_time[i_letter] <= 9)    {
                ca_time[i_letter] += '0';
            }
          /*  Convert the character to it's equivalent ascii code */
          /* */
            else    {
                ca_time[i_letter] += 'A' - 10;
            }
        }
        
        /*  End the created time string. */
        /* */
        ca_time[i_letter] = '\0';
        
        /*  Reverse the time string. */
        /* */
        _strrev(ca_time);
        
        /*  Create the fully qualified path and file name. */
        /* */
        sprintf(file_buf, "%s\\%s%s%s", directory, prefix, ca_time, ext);

        /*  Determine if the file exists, and mark that we've tried yet */
        /*    another file name (mark to be used later). */
        /*   */
        /*  Use the system call instead of XP_Stat since we already */
        /*  know the name and we don't want recursion */
        /* */
        status = _stat(file_buf, &statinfo);
        i_numtries++;

        /*  If it does not exists, we are successful, return the name. */
        /* */
        if(status == -1)    {
           /* don't generate a directory as part of the cache temp names.    
	    * When the cache file name is passed into the other XP_File 
	    * functions we will append the cache directory to the name
            * to get the complete path.
            * This will allow the cache to be moved around
            * and for netscape to be used to generate external cache FAT's.    
            */
            if(type == xpCache )
		sprintf(file_buf, "%s%s%s", prefix, ca_time, ext);

            TRACE("Temp file name is %s\n", file_buf);
            return(file_buf);
        }
        
        /*  If there is no room for additional characters in the time, */
        /*    we'll have to return NULL here, or we go infinite. */
        /*    This is a one case scenario where the requested prefix is */
        /*    actually 8 letters long!   */
        /*  Infinite loops could occur with a 7, 6, 5, etc character prefixes */
        /*    if available files are all eaten up (rare to impossible), in */
        /*    which case, we should check at some arbitrary frequency of */
        /*    tries before we give up instead of attempting to Vulcanize */
        /*    this code.  Live long and prosper. */
        /* */
        if(i_timechars == 0)    {
            break;
        } else if(i_numtries == 0x00FF) {
            break;
        }
    }