rumpuser_random.c revision 1.2.6.2
1 1.2.6.2 tls /* 2 1.2.6.2 tls * Copyright (c) 2014 Justin Cormack. All Rights Reserved. 3 1.2.6.2 tls * 4 1.2.6.2 tls * Redistribution and use in source and binary forms, with or without 5 1.2.6.2 tls * modification, are permitted provided that the following conditions 6 1.2.6.2 tls * are met: 7 1.2.6.2 tls * 1. Redistributions of source code must retain the above copyright 8 1.2.6.2 tls * notice, this list of conditions and the following disclaimer. 9 1.2.6.2 tls * 2. Redistributions in binary form must reproduce the above copyright 10 1.2.6.2 tls * notice, this list of conditions and the following disclaimer in the 11 1.2.6.2 tls * documentation and/or other materials provided with the distribution. 12 1.2.6.2 tls * 13 1.2.6.2 tls * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 14 1.2.6.2 tls * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 1.2.6.2 tls * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 1.2.6.2 tls * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 1.2.6.2 tls * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 1.2.6.2 tls * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 19 1.2.6.2 tls * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 1.2.6.2 tls * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 1.2.6.2 tls * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 1.2.6.2 tls * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 1.2.6.2 tls * SUCH DAMAGE. 24 1.2.6.2 tls */ 25 1.2.6.2 tls 26 1.2.6.2 tls #include "rumpuser_port.h" 27 1.2.6.2 tls 28 1.2.6.2 tls #if !defined(lint) 29 1.2.6.2 tls __RCSID("$NetBSD: rumpuser_random.c,v 1.2.6.2 2014/08/20 00:02:21 tls Exp $"); 30 1.2.6.2 tls #endif /* !lint */ 31 1.2.6.2 tls 32 1.2.6.2 tls #include <sys/types.h> 33 1.2.6.2 tls 34 1.2.6.2 tls #include <assert.h> 35 1.2.6.2 tls #include <errno.h> 36 1.2.6.2 tls #include <fcntl.h> 37 1.2.6.2 tls #include <stdint.h> 38 1.2.6.2 tls #include <stdio.h> 39 1.2.6.2 tls #include <stdlib.h> 40 1.2.6.2 tls #include <string.h> 41 1.2.6.2 tls #include <unistd.h> 42 1.2.6.2 tls 43 1.2.6.2 tls #include <rump/rumpuser.h> 44 1.2.6.2 tls 45 1.2.6.2 tls #include "rumpuser_int.h" 46 1.2.6.2 tls 47 1.2.6.2 tls static const size_t random_maxread = 32; 48 1.2.6.2 tls 49 1.2.6.2 tls #ifdef PLATFORM_HAS_ARC4RANDOM_BUF 50 1.2.6.2 tls int 51 1.2.6.2 tls rumpuser__random_init(void) 52 1.2.6.2 tls { 53 1.2.6.2 tls 54 1.2.6.2 tls return 0; 55 1.2.6.2 tls } 56 1.2.6.2 tls #else 57 1.2.6.2 tls static const char *random_device = "/dev/urandom"; 58 1.2.6.2 tls static int random_fd = -1; 59 1.2.6.2 tls 60 1.2.6.2 tls int 61 1.2.6.2 tls rumpuser__random_init(void) 62 1.2.6.2 tls { 63 1.2.6.2 tls 64 1.2.6.2 tls random_fd = open(random_device, O_RDONLY); 65 1.2.6.2 tls if (random_fd < 0) { 66 1.2.6.2 tls fprintf(stderr, "random init open failed\n"); 67 1.2.6.2 tls return errno; 68 1.2.6.2 tls } 69 1.2.6.2 tls return 0; 70 1.2.6.2 tls } 71 1.2.6.2 tls #endif 72 1.2.6.2 tls 73 1.2.6.2 tls int 74 1.2.6.2 tls rumpuser_getrandom(void *buf, size_t buflen, int flags, size_t *retp) 75 1.2.6.2 tls { 76 1.2.6.2 tls #ifndef PLATFORM_HAS_ARC4RANDOM_BUF 77 1.2.6.2 tls ssize_t rv; 78 1.2.6.2 tls 79 1.2.6.2 tls rv = read(random_fd, buf, buflen > random_maxread ? random_maxread : buflen); 80 1.2.6.2 tls if (rv < 0) { 81 1.2.6.2 tls ET(errno); 82 1.2.6.2 tls } 83 1.2.6.2 tls *retp = rv; 84 1.2.6.2 tls #else 85 1.2.6.2 tls buflen = buflen > random_maxread ? random_maxread : buflen; 86 1.2.6.2 tls arc4random_buf(buf, buflen); 87 1.2.6.2 tls *retp = buflen; 88 1.2.6.2 tls #endif 89 1.2.6.2 tls 90 1.2.6.2 tls return 0; 91 1.2.6.2 tls } 92
Indexes created Thu Oct 02 07:10:07 GMT 2025