NetBSD-5.0.2/sbin/rndctl/rndctl.c
/* $NetBSD: rndctl.c,v 1.17.28.1 2009/01/08 23:00:16 snj Exp $ */
/*-
* Copyright (c) 1997 Michael Graff.
* 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 author nor the names of other contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: rndctl.c,v 1.17.28.1 2009/01/08 23:00:16 snj Exp $");
#endif
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/rnd.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <err.h>
#include <string.h>
typedef struct {
const char *a_name;
u_int32_t a_type;
} arg_t;
arg_t source_types[] = {
{ "???", RND_TYPE_UNKNOWN },
{ "disk", RND_TYPE_DISK },
{ "net", RND_TYPE_NET },
{ "tape", RND_TYPE_TAPE },
{ "tty", RND_TYPE_TTY },
{ "rng", RND_TYPE_RNG },
{ NULL, 0 }
};
static void usage(void);
u_int32_t find_type(char *name);
const char *find_name(u_int32_t);
void do_ioctl(rndctl_t *);
char * strflags(u_int32_t);
void do_list(int, u_int32_t, char *);
void do_stats(void);
static void
usage(void)
{
fprintf(stderr, "usage: %s -CEce [-d devname | -t devtype]\n",
getprogname());
fprintf(stderr, " %s -ls [-d devname | -t devtype]\n",
getprogname());
exit(1);
}
u_int32_t
find_type(char *name)
{
arg_t *a;
a = source_types;
while (a->a_name != NULL) {
if (strcmp(a->a_name, name) == 0)
return (a->a_type);
a++;
}
errx(1, "device name %s unknown", name);
return (0);
}
const char *
find_name(u_int32_t type)
{
arg_t *a;
a = source_types;
while (a->a_name != NULL) {
if (type == a->a_type)
return (a->a_name);
a++;
}
warnx("device type %u unknown", type);
return ("???");
}
void
do_ioctl(rndctl_t *rctl)
{
int fd;
int res;
fd = open("/dev/urandom", O_RDONLY, 0644);
if (fd < 0)
err(1, "open");
res = ioctl(fd, RNDCTL, rctl);
if (res < 0)
err(1, "ioctl(RNDCTL)");
close(fd);
}
char *
strflags(u_int32_t fl)
{
static char str[512];
str[0] = 0;
if (fl & RND_FLAG_NO_ESTIMATE)
;
else
strlcat(str, "estimate", sizeof(str));
if (fl & RND_FLAG_NO_COLLECT)
;
else {
if (str[0])
strlcat(str, ", ", sizeof(str));
strlcat(str, "collect", sizeof(str));
}
return (str);
}
#define HEADER "Source Bits Type Flags\n"
void
do_list(int all, u_int32_t type, char *name)
{
rndstat_t rstat;
rndstat_name_t rstat_name;
int fd;
int res;
u_int32_t start;
fd = open("/dev/urandom", O_RDONLY, 0644);
if (fd < 0)
err(1, "open");
if (all == 0 && type == 0xff) {
strncpy(rstat_name.name, name, sizeof(rstat_name.name));
res = ioctl(fd, RNDGETSRCNAME, &rstat_name);
if (res < 0)
err(1, "ioctl(RNDGETSRCNAME)");
printf(HEADER);
printf("%-16s %10u %-4s %s\n",
rstat_name.source.name,
rstat_name.source.total,
find_name(rstat_name.source.type),
strflags(rstat_name.source.flags));
close(fd);
return;
}
/*
* Run through all the devices present in the system, and either
* print out ones that match, or print out all of them.
*/
printf(HEADER);
start = 0;
for (;;) {
rstat.count = RND_MAXSTATCOUNT;
rstat.start = start;
res = ioctl(fd, RNDGETSRCNUM, &rstat);
if (res < 0)
err(1, "ioctl(RNDGETSRCNUM)");
if (rstat.count == 0)
break;
for (res = 0; res < rstat.count; res++) {
if (all != 0 ||
type == rstat.source[res].type)
printf("%-16s %10u %-4s %s\n",
rstat.source[res].name,
rstat.source[res].total,
find_name(rstat.source[res].type),
strflags(rstat.source[res].flags));
}
start += rstat.count;
}
close(fd);
}
void
do_stats()
{
rndpoolstat_t rs;
int fd;
fd = open("/dev/urandom", O_RDONLY, 0644);
if (fd < 0)
err(1, "open");
if (ioctl(fd, RNDGETPOOLSTAT, &rs) < 0)
err(1, "ioctl(RNDGETPOOLSTAT)");
printf("\t%9u bits mixed into pool\n", rs.added);
printf("\t%9u bits currently stored in pool (max %u)\n",
rs.curentropy, rs.maxentropy);
printf("\t%9u bits of entropy discarded due to full pool\n",
rs.discarded);
printf("\t%9u hard-random bits generated\n", rs.removed);
printf("\t%9u pseudo-random bits generated\n", rs.generated);
close(fd);
}
int
main(int argc, char **argv)
{
rndctl_t rctl;
int ch, cmd, lflag, mflag, sflag;
u_int32_t type;
char name[16];
rctl.mask = 0;
rctl.flags = 0;
cmd = 0;
lflag = 0;
mflag = 0;
sflag = 0;
type = 0xff;
while ((ch = getopt(argc, argv, "CEcelt:d:s")) != -1) {
switch (ch) {
case 'C':
rctl.flags |= RND_FLAG_NO_COLLECT;
rctl.mask |= RND_FLAG_NO_COLLECT;
mflag++;
break;
case 'E':
rctl.flags |= RND_FLAG_NO_ESTIMATE;
rctl.mask |= RND_FLAG_NO_ESTIMATE;
mflag++;
break;
case 'c':
rctl.flags &= ~RND_FLAG_NO_COLLECT;
rctl.mask |= RND_FLAG_NO_COLLECT;
mflag++;
break;
case 'e':
rctl.flags &= ~RND_FLAG_NO_ESTIMATE;
rctl.mask |= RND_FLAG_NO_ESTIMATE;
mflag++;
break;
case 'l':
lflag++;
break;
case 't':
if (cmd != 0)
usage();
cmd = 't';
type = find_type(optarg);
break;
case 'd':
if (cmd != 0)
usage();
cmd = 'd';
type = 0xff;
strlcpy(name, optarg, sizeof(name));
break;
case 's':
sflag++;
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
/*
* No leftover non-option arguments.
*/
if (argc > 0)
usage();
/*
* Cannot list and modify at the same time.
*/
if ((lflag != 0 || sflag != 0) && mflag != 0)
usage();
/*
* Bomb out on no-ops.
*/
if (lflag == 0 && mflag == 0 && sflag == 0)
usage();
/*
* If not listing, we need a device name or a type.
*/
if (lflag == 0 && cmd == 0 && sflag == 0)
usage();
/*
* Modify request.
*/
if (mflag != 0) {
rctl.type = type;
strncpy(rctl.name, name, sizeof(rctl.name));
do_ioctl(&rctl);
exit(0);
}
/*
* List sources.
*/
if (lflag != 0)
do_list(cmd == 0, type, name);
if (sflag != 0)
do_stats();
exit(0);
}