2002-06-29 13:46:34 +00:00
|
|
|
/* mkdtemp.c - libc replacement function
|
|
|
|
* Copyright (C) 2001 Free Software Foundation, Inc.
|
|
|
|
*
|
|
|
|
* This file is part of GnuPG.
|
|
|
|
*
|
|
|
|
* GnuPG is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
|
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* GnuPG is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
* along with this program; if not, write to the Free Software
|
|
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* This is a replacement function for mkdtemp in case the platform
|
|
|
|
we're building on (like mine!) doesn't have it. */
|
|
|
|
|
|
|
|
#include <config.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <sys/stat.h>
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <fcntl.h>
|
|
|
|
#include <unistd.h>
|
|
|
|
#include "types.h"
|
|
|
|
#include "cipher.h"
|
|
|
|
|
|
|
|
#ifdef MKDIR_TAKES_ONE_ARG
|
|
|
|
# undef mkdir
|
|
|
|
# define mkdir(a,b) mkdir(a)
|
|
|
|
#endif
|
|
|
|
|
|
|
|
char *mkdtemp(char *template)
|
|
|
|
{
|
2002-07-01 16:40:52 +00:00
|
|
|
unsigned int attempts,idx,count=0;
|
2002-06-29 13:46:34 +00:00
|
|
|
byte *ch;
|
|
|
|
|
|
|
|
idx=strlen(template);
|
|
|
|
|
|
|
|
/* Walk backwards to count all the Xes */
|
|
|
|
while(idx>0 && template[idx-1]=='X')
|
|
|
|
{
|
|
|
|
count++;
|
|
|
|
idx--;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(count==0)
|
|
|
|
{
|
|
|
|
errno=EINVAL;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
ch=&template[idx];
|
|
|
|
|
|
|
|
/* Try 4 times to make the temp directory */
|
|
|
|
for(attempts=0;attempts<4;attempts++)
|
|
|
|
{
|
2002-07-01 16:40:52 +00:00
|
|
|
unsigned int remaining=count;
|
2002-06-29 13:46:34 +00:00
|
|
|
char *marker=ch;
|
|
|
|
byte *randombits;
|
|
|
|
|
|
|
|
idx=0;
|
|
|
|
|
|
|
|
/* Using really random bits is probably overkill here. The
|
|
|
|
worst thing that can happen with a directory name collision
|
|
|
|
is that the function will return an error. */
|
|
|
|
|
|
|
|
randombits=get_random_bits(4*remaining,0,0);
|
|
|
|
|
|
|
|
while(remaining>1)
|
|
|
|
{
|
|
|
|
sprintf(marker,"%02X",randombits[idx++]);
|
|
|
|
marker+=2;
|
|
|
|
remaining-=2;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Any leftover Xes? get_random_bits rounds up to full bytes,
|
|
|
|
so this is safe. */
|
|
|
|
if(remaining>0)
|
|
|
|
sprintf(marker,"%X",randombits[idx]&0xF);
|
|
|
|
|
2003-06-18 19:56:13 +00:00
|
|
|
xfree (randombits);
|
2002-06-29 13:46:34 +00:00
|
|
|
|
|
|
|
if(mkdir(template,0700)==0)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(attempts==4)
|
|
|
|
return NULL; /* keeps the errno from mkdir, whatever it is */
|
|
|
|
|
|
|
|
return template;
|
|
|
|
}
|