1#!/bin/sh 2# 3# $FreeBSD: src/etc/rc.d/random,v 1.3 2003/04/18 17:55:05 mtm Exp $ 4# 5 6# PROVIDE: random 7# REQUIRE: diskless mountcritlocal initrandom 8# BEFORE: FILESYSTEMS 9# KEYWORD: shutdown 10 11. /etc/rc.subr 12 13name="random" 14start_cmd="random_start" 15stop_cmd="random_stop" 16 17feed_dev_random() 18{ 19 if [ -f "${1}" -a -r "${1}" -a -s "${1}" ]; then 20 ${SYSCTL_W} kern.seedenable=1 >/dev/null 21 # Feed using a small block size so that a pool-based CSPRNG 22 # is more likely to distribute the entropy over several 23 # pools 24 cat "${1}" | dd of=/dev/random bs=512 2>/dev/null 25 ${SYSCTL_W} kern.seedenable=0 >/dev/null 26 fi 27} 28 29random_start() 30{ 31 # Reseed /dev/random with previously stored entropy. 32 case ${entropy_dir} in 33 [Nn][Oo] | '') 34 ;; 35 *) 36 entropy_dir=${entropy_dir:-/var/db/entropy} 37 if [ -d "${entropy_dir}" ]; then 38 if [ -w /dev/random ]; then 39 for seedfile in ${entropy_dir}/*; do 40 feed_dev_random "${seedfile}" 41 done 42 fi 43 fi 44 ;; 45 esac 46 47 case ${entropy_file} in 48 [Nn][Oo] | '') 49 ;; 50 *) 51 if [ -w /dev/random ]; then 52 feed_dev_random "${entropy_file}" 53 fi 54 ;; 55 esac 56} 57 58random_stop() 59{ 60 # Write some entropy so when the machine reboots /dev/random 61 # can be reseeded 62 # 63 case ${entropy_file} in 64 [Nn][Oo] | '') 65 ;; 66 *) 67 echo -n 'Writing entropy file:' 68 rm -f ${entropy_file} 69 oumask=`umask` 70 umask 077 71 if touch ${entropy_file}; then 72 entropy_file_confirmed="${entropy_file}" 73 fi 74 case ${entropy_file_confirmed} in 75 '') 76 err 1 '${entropy_file}:' \ 77 ' entropy file write failed.' 78 ;; 79 *) 80 dd if=/dev/random of=${entropy_file_confirmed} \ 81 bs=${entropy_save_sz} count=1 2> /dev/null 82 echo '.' 83 ;; 84 esac 85 umask ${oumask} 86 ;; 87 esac 88} 89 90load_rc_config $name 91run_rc_command "$1" 92