randfile.c revision 4bc0a2ef2b7ba50a7a717e7ddbf31472ad28e358
/* crypto/rand/randfile.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* We need to define this to get macros like S_ISBLK and S_ISCHR */
#ifndef _BOOT
#define _XOPEN_SOURCE 1
#endif /* _BOOT */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "e_os.h"
#ifdef OPENSSL_SYS_VMS
#include <unixio.h>
#endif
#ifndef NO_SYS_TYPES_H
#endif
#ifdef MAC_OS_pre_X
# include <stat.h>
#else
#endif
#define BUFSIZE 1024
#define RAND_DATA 1024
/* #define RFILE ".rnd" - defined in ../../e_os.h */
/* Note that these functions are intended for seed files only.
* Entropy devices and EGD sockets are handled in rand_unix.c */
{
/* If bytes >= 0, read up to 'bytes' bytes.
* if bytes == -1, read complete file. */
int i,ret=0,n;
/* If the state fails, put some crap in anyway */
if (i < 0) return(0);
/* this file is a device. we don't want read an infinite number
* of bytes from a random device, nor do we want to use buffered
* I/O because we will waste system entropy.
*/
}
#endif
for (;;)
{
if (bytes > 0)
else
n = BUFSIZE;
if (i <= 0) break;
/* even if n != i, use the full array */
ret+=i;
if (bytes > 0)
{
bytes-=n;
if (bytes <= 0) break;
}
}
err:
return(ret);
}
int RAND_write_file(const char *file)
{
int n;
if (i != -1) {
/* this file is a device. we don't write back to it.
* we "succeed" on the assumption this is some sort
* of random device. Otherwise attempting to write to
* and chmod the device causes problems.
*/
return(1);
}
#endif
}
#if defined(O_CREAT) && !defined(OPENSSL_SYS_WIN32)
/* For some reason Win32 can't write to files created this way */
/* chmod(..., 0600) is too late to protect the file,
* permissions should be restrictive from the start */
if (fd != -1)
#endif
#ifndef NO_CHMOD
#endif
n=RAND_DATA;
for (;;)
{
n-=BUFSIZE;
if (RAND_bytes(buf,i) <= 0)
rand_err=1;
if (i <= 0)
{
ret=0;
break;
}
ret+=i;
if (n <= 0) break;
}
#ifdef OPENSSL_SYS_VMS
/* Try to delete older versions of the file, until there aren't
any */
{
char *tmpf;
if (tmpf)
{
;
will reach the limit (32767) at
some point... */
}
}
#endif /* OPENSSL_SYS_VMS */
err:
}
{
char *s=NULL;
int ok = 0;
#ifdef __OpenBSD__
#endif
if (OPENSSL_issetugid() == 0)
s=getenv("RANDFILE");
{
return NULL;
}
else
{
if (OPENSSL_issetugid() == 0)
s=getenv("HOME");
#ifdef DEFAULT_HOME
if (s == NULL)
{
s = DEFAULT_HOME;
}
#endif
{
#ifndef OPENSSL_SYS_VMS
#endif
ok = 1;
}
else
}
#ifdef __OpenBSD__
/* given that all random loads just fail if the file can't be
* seen on a stat, we stat the file we're returning, if it
* use their own source for good random data, but defaults
* to something hopefully decent if that isn't available.
*/
if (!ok)
return(NULL);
}
return(NULL);
}
#endif
return(buf);
}