db8f03740a
unix_seed(), called by the add-seed-data op unix_add(), attempts to write seed data to the random data device. If this fails, the failure is ignored, as it must be, since there is no way to inform the caller. This change modifies the way in which the return value from write(2) is ignored, to avoid compiler warnings when building on Ubuntu 12.10, with gcc 4.7.2 and eglibc 2.15-0ubuntu20.1.
167 lines
3.4 KiB
C
167 lines
3.4 KiB
C
/*
|
|
* Copyright (c) 2006 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* 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. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <rand.h>
|
|
#include <heim_threads.h>
|
|
|
|
#include <roken.h>
|
|
|
|
#include "randi.h"
|
|
|
|
/*
|
|
* Unix /dev/random
|
|
*/
|
|
|
|
int
|
|
_hc_unix_device_fd(int flags, const char **fn)
|
|
{
|
|
static const char *rnd_devices[] = {
|
|
"/dev/urandom",
|
|
"/dev/random",
|
|
"/dev/srandom",
|
|
"/dev/arandom",
|
|
NULL
|
|
};
|
|
const char **p;
|
|
|
|
for(p = rnd_devices; *p; p++) {
|
|
int fd = open(*p, flags | O_NDELAY);
|
|
if(fd >= 0) {
|
|
if (fn)
|
|
*fn = *p;
|
|
rk_cloexec(fd);
|
|
return fd;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static void
|
|
unix_seed(const void *indata, int size)
|
|
{
|
|
int fd;
|
|
|
|
if (size <= 0)
|
|
return;
|
|
|
|
fd = _hc_unix_device_fd(O_WRONLY, NULL);
|
|
if (fd < 0)
|
|
return;
|
|
|
|
if (write(fd, indata, size) != size)
|
|
; /* don't care */
|
|
close(fd);
|
|
|
|
}
|
|
|
|
|
|
static int
|
|
unix_bytes(unsigned char *outdata, int size)
|
|
{
|
|
ssize_t count;
|
|
int fd;
|
|
|
|
if (size < 0)
|
|
return 0;
|
|
else if (size == 0)
|
|
return 1;
|
|
|
|
fd = _hc_unix_device_fd(O_RDONLY, NULL);
|
|
if (fd < 0)
|
|
return 0;
|
|
|
|
while (size > 0) {
|
|
count = read(fd, outdata, size);
|
|
if (count < 0 && errno == EINTR)
|
|
continue;
|
|
else if (count <= 0) {
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
outdata += count;
|
|
size -= count;
|
|
}
|
|
close(fd);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
unix_cleanup(void)
|
|
{
|
|
}
|
|
|
|
static void
|
|
unix_add(const void *indata, int size, double entropi)
|
|
{
|
|
unix_seed(indata, size);
|
|
}
|
|
|
|
static int
|
|
unix_pseudorand(unsigned char *outdata, int size)
|
|
{
|
|
return unix_bytes(outdata, size);
|
|
}
|
|
|
|
static int
|
|
unix_status(void)
|
|
{
|
|
int fd;
|
|
|
|
fd = _hc_unix_device_fd(O_RDONLY, NULL);
|
|
if (fd < 0)
|
|
return 0;
|
|
close(fd);
|
|
|
|
return 1;
|
|
}
|
|
|
|
const RAND_METHOD hc_rand_unix_method = {
|
|
unix_seed,
|
|
unix_bytes,
|
|
unix_cleanup,
|
|
unix_add,
|
|
unix_pseudorand,
|
|
unix_status
|
|
};
|
|
|
|
const RAND_METHOD *
|
|
RAND_unix_method(void)
|
|
{
|
|
return &hc_rand_unix_method;
|
|
}
|