504 lines
9.9 KiB
C
504 lines
9.9 KiB
C
/* $NetBSD: rndctl.c,v 1.25 2012/08/14 14:41:07 jruoho Exp $ */
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/*-
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* Copyright (c) 1997 Michael Graff.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of other contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sha1.h>
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#ifndef lint
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__RCSID("$NetBSD: rndctl.c,v 1.25 2012/08/14 14:41:07 jruoho Exp $");
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#endif
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/rnd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <err.h>
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#include <paths.h>
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#include <string.h>
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typedef struct {
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const char *a_name;
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u_int32_t a_type;
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} arg_t;
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static const arg_t source_types[] = {
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{ "???", RND_TYPE_UNKNOWN },
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{ "disk", RND_TYPE_DISK },
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{ "net", RND_TYPE_NET },
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{ "tape", RND_TYPE_TAPE },
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{ "tty", RND_TYPE_TTY },
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{ "rng", RND_TYPE_RNG },
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{ "skew", RND_TYPE_SKEW },
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{ "env", RND_TYPE_ENV },
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{ "vm", RND_TYPE_VM },
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{ "power", RND_TYPE_POWER },
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{ NULL, 0 }
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};
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__dead static void usage(void);
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static u_int32_t find_type(const char *name);
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static const char *find_name(u_int32_t);
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static void do_ioctl(rndctl_t *);
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static char * strflags(u_int32_t);
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static void do_list(int, u_int32_t, char *);
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static void do_stats(void);
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s -CEce [-d devname | -t devtype]\n",
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getprogname());
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fprintf(stderr, " %s -ls [-d devname | -t devtype]\n",
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getprogname());
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fprintf(stderr, " %s -[L|S] save-file\n", getprogname());
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exit(1);
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}
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static u_int32_t
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find_type(const char *name)
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{
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const arg_t *a;
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a = source_types;
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while (a->a_name != NULL) {
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if (strcmp(a->a_name, name) == 0)
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return (a->a_type);
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a++;
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}
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errx(1, "device name %s unknown", name);
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return (0);
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}
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static const char *
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find_name(u_int32_t type)
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{
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const arg_t *a;
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a = source_types;
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while (a->a_name != NULL) {
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if (type == a->a_type)
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return (a->a_name);
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a++;
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}
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warnx("device type %u unknown", type);
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return ("???");
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}
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static void
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do_save(const char *const filename)
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{
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int est1, est2;
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rndpoolstat_t rp;
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rndsave_t rs;
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SHA1_CTX s;
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int fd;
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fd = open(_PATH_URANDOM, O_RDONLY, 0644);
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if (fd < 0) {
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err(1, "device open");
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}
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if (ioctl(fd, RNDGETPOOLSTAT, &rp) < 0) {
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err(1, "ioctl(RNDGETPOOLSTAT)");
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}
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est1 = rp.curentropy;
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if (read(fd, rs.data, sizeof(rs.data)) != sizeof(rs.data)) {
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err(1, "entropy read");
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}
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if (ioctl(fd, RNDGETPOOLSTAT, &rp) < 0) {
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err(1, "ioctl(RNDGETPOOLSTAT)");
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}
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est2 = rp.curentropy;
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if (est1 - est2 < 0) {
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rs.entropy = 0;
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} else {
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rs.entropy = est1 - est2;
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}
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SHA1Init(&s);
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SHA1Update(&s, (uint8_t *)&rs.entropy, sizeof(rs.entropy));
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SHA1Update(&s, rs.data, sizeof(rs.data));
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SHA1Final(rs.digest, &s);
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close(fd);
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unlink(filename);
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fd = open(filename, O_CREAT|O_EXCL|O_WRONLY, 0600);
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if (fd < 0) {
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err(1, "output open");
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}
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if (write(fd, &rs, sizeof(rs)) != sizeof(rs)) {
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unlink(filename);
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fsync_range(fd, FDATASYNC|FDISKSYNC, (off_t)0, (off_t)0);
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err(1, "write");
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}
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fsync_range(fd, FDATASYNC|FDISKSYNC, (off_t)0, (off_t)0);
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close(fd);
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}
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static void
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do_load(const char *const filename)
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{
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int fd;
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rndsave_t rs, rszero;
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rnddata_t rd;
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SHA1_CTX s;
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uint8_t digest[SHA1_DIGEST_LENGTH];
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fd = open(filename, O_RDWR, 0600);
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if (fd < 0) {
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err(1, "input open");
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}
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unlink(filename);
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if (read(fd, &rs, sizeof(rs)) != sizeof(rs)) {
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err(1, "read");
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}
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memset(&rszero, 0, sizeof(rszero));
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if (write(fd, &rszero, sizeof(rszero) != sizeof(rszero))) {
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err(1, "overwrite");
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}
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fsync_range(fd, FDATASYNC|FDISKSYNC, (off_t)0, (off_t)0);
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close(fd);
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SHA1Init(&s);
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SHA1Update(&s, (uint8_t *)&rs.entropy, sizeof(rs.entropy));
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SHA1Update(&s, rs.data, sizeof(rs.data));
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SHA1Final(digest, &s);
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if (memcmp(digest, rs.digest, sizeof(digest))) {
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errx(1, "bad digest");
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}
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rd.len = MIN(sizeof(rd.data), sizeof(rs.data));
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rd.entropy = rs.entropy;
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memcpy(rd.data, rs.data, MIN(sizeof(rd.data), sizeof(rs.data)));
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fd = open(_PATH_URANDOM, O_RDWR, 0644);
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if (fd < 0) {
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err(1, "device open");
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}
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if (ioctl(fd, RNDADDDATA, &rd) < 0) {
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err(1, "ioctl");
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}
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close(fd);
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}
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static void
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do_ioctl(rndctl_t *rctl)
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{
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int fd;
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int res;
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fd = open(_PATH_URANDOM, O_RDONLY, 0644);
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if (fd < 0)
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err(1, "open");
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res = ioctl(fd, RNDCTL, rctl);
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if (res < 0)
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err(1, "ioctl(RNDCTL)");
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close(fd);
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}
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static char *
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strflags(u_int32_t fl)
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{
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static char str[512];
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str[0] = 0;
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if (fl & RND_FLAG_NO_ESTIMATE)
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;
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else
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strlcat(str, "estimate", sizeof(str));
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if (fl & RND_FLAG_NO_COLLECT)
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;
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else {
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if (str[0])
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strlcat(str, ", ", sizeof(str));
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strlcat(str, "collect", sizeof(str));
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}
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return (str);
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}
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#define HEADER "Source Bits Type Flags\n"
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static void
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do_list(int all, u_int32_t type, char *name)
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{
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rndstat_t rstat;
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rndstat_name_t rstat_name;
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int fd;
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int res;
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uint32_t i;
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u_int32_t start;
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fd = open(_PATH_URANDOM, O_RDONLY, 0644);
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if (fd < 0)
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err(1, "open");
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if (all == 0 && type == 0xff) {
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strncpy(rstat_name.name, name, sizeof(rstat_name.name));
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res = ioctl(fd, RNDGETSRCNAME, &rstat_name);
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if (res < 0)
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err(1, "ioctl(RNDGETSRCNAME)");
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printf(HEADER);
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printf("%-16s %10u %-4s %s\n",
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rstat_name.source.name,
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rstat_name.source.total,
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find_name(rstat_name.source.type),
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strflags(rstat_name.source.flags));
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close(fd);
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return;
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}
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/*
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* Run through all the devices present in the system, and either
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* print out ones that match, or print out all of them.
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*/
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printf(HEADER);
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start = 0;
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for (;;) {
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rstat.count = RND_MAXSTATCOUNT;
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rstat.start = start;
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res = ioctl(fd, RNDGETSRCNUM, &rstat);
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if (res < 0)
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err(1, "ioctl(RNDGETSRCNUM)");
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if (rstat.count == 0)
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break;
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for (i = 0; i < rstat.count; i++) {
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if (all != 0 ||
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type == rstat.source[i].type)
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printf("%-16s %10u %-4s %s\n",
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rstat.source[i].name,
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rstat.source[i].total,
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find_name(rstat.source[i].type),
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strflags(rstat.source[i].flags));
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}
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start += rstat.count;
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}
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close(fd);
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}
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static void
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do_stats(void)
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{
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rndpoolstat_t rs;
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int fd;
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fd = open(_PATH_URANDOM, O_RDONLY, 0644);
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if (fd < 0)
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err(1, "open");
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if (ioctl(fd, RNDGETPOOLSTAT, &rs) < 0)
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err(1, "ioctl(RNDGETPOOLSTAT)");
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printf("\t%9u bits mixed into pool\n", rs.added);
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printf("\t%9u bits currently stored in pool (max %u)\n",
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rs.curentropy, rs.maxentropy);
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printf("\t%9u bits of entropy discarded due to full pool\n",
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rs.discarded);
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printf("\t%9u hard-random bits generated\n", rs.removed);
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printf("\t%9u pseudo-random bits generated\n", rs.generated);
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close(fd);
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}
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int
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main(int argc, char **argv)
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{
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rndctl_t rctl;
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int ch, cmd, lflag, mflag, sflag;
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u_int32_t type;
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char name[16];
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const char *filename = NULL;
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rctl.mask = 0;
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rctl.flags = 0;
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cmd = 0;
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lflag = 0;
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mflag = 0;
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sflag = 0;
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type = 0xff;
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while ((ch = getopt(argc, argv, "CES:L:celt:d:s")) != -1) {
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switch (ch) {
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case 'C':
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rctl.flags |= RND_FLAG_NO_COLLECT;
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rctl.mask |= RND_FLAG_NO_COLLECT;
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mflag++;
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break;
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case 'E':
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rctl.flags |= RND_FLAG_NO_ESTIMATE;
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rctl.mask |= RND_FLAG_NO_ESTIMATE;
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mflag++;
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break;
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case 'L':
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if (cmd != 0)
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usage();
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cmd = 'L';
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filename = optarg;
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break;
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case 'S':
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if (cmd != 0)
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usage();
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cmd = 'S';
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filename = optarg;
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break;
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case 'c':
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rctl.flags &= ~RND_FLAG_NO_COLLECT;
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rctl.mask |= RND_FLAG_NO_COLLECT;
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mflag++;
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break;
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case 'e':
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rctl.flags &= ~RND_FLAG_NO_ESTIMATE;
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rctl.mask |= RND_FLAG_NO_ESTIMATE;
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mflag++;
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break;
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case 'l':
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lflag++;
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break;
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case 't':
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if (cmd != 0)
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usage();
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cmd = 't';
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type = find_type(optarg);
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break;
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case 'd':
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if (cmd != 0)
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usage();
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cmd = 'd';
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type = 0xff;
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strlcpy(name, optarg, sizeof(name));
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break;
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case 's':
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sflag++;
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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/*
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* No leftover non-option arguments.
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*/
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if (argc > 0)
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usage();
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/*
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* Save.
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*/
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if (cmd == 'S') {
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do_save(filename);
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exit(0);
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}
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/*
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* Load.
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*/
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if (cmd == 'L') {
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do_load(filename);
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exit(0);
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}
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/*
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* Cannot list and modify at the same time.
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*/
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if ((lflag != 0 || sflag != 0) && mflag != 0)
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usage();
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/*
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* Bomb out on no-ops.
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*/
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if (lflag == 0 && mflag == 0 && sflag == 0)
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usage();
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/*
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* If not listing, we need a device name or a type.
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*/
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if (lflag == 0 && cmd == 0 && sflag == 0)
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usage();
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/*
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* Modify request.
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*/
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if (mflag != 0) {
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rctl.type = type;
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strncpy(rctl.name, name, sizeof(rctl.name));
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do_ioctl(&rctl);
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exit(0);
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}
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/*
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* List sources.
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*/
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if (lflag != 0)
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do_list(cmd == 0, type, name);
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if (sflag != 0)
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do_stats();
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exit(0);
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}
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