1#!/bin/sh 2# 3# $FreeBSD: src/etc/rc.d/random,v 1.3 2003/04/18 17:55:05 mtm Exp $ 4# $DragonFly: src/etc/rc.d/random,v 1.4 2006/07/10 22:19:14 dillon Exp $ 5# 6 7# PROVIDE: random 8# REQUIRE: diskless mountcritlocal initrandom 9# BEFORE: netif 10# KEYWORD: shutdown 11 12. /etc/rc.subr 13 14name="random" 15start_cmd="random_start" 16stop_cmd="random_stop" 17 18feed_dev_random() 19{ 20 if [ -f "${1}" -a -r "${1}" -a -s "${1}" ]; then 21 sysctl kern.seedenable=1 22 cat "${1}" | dd of=/dev/random bs=8k 2>/dev/null 23 sysctl kern.seedenable=0 24 fi 25} 26 27random_start() 28{ 29 # Reseed /dev/random with previously stored entropy. 30 case ${entropy_dir} in 31 [Nn][Oo]) 32 ;; 33 *) 34 entropy_dir=${entropy_dir:-/var/db/entropy} 35 if [ -d "${entropy_dir}" ]; then 36 if [ -w /dev/random ]; then 37 for seedfile in ${entropy_dir}/*; do 38 feed_dev_random "${seedfile}" 39 done 40 fi 41 fi 42 ;; 43 esac 44 45 case ${entropy_file} in 46 [Nn][Oo] | '') 47 ;; 48 *) 49 if [ -w /dev/random ]; then 50 feed_dev_random "${entropy_file}" 51 fi 52 ;; 53 esac 54} 55 56random_stop() 57{ 58 # Write some entropy so when the machine reboots /dev/random 59 # can be reseeded 60 # 61 case ${entropy_file} in 62 [Nn][Oo] | '') 63 ;; 64 *) 65 echo -n 'Writing entropy file:' 66 rm -f ${entropy_file} 67 oumask=`umask` 68 umask 077 69 if touch ${entropy_file}; then 70 entropy_file_confirmed="${entropy_file}" 71 else 72 # Try this as a reasonable alternative for read-only 73 # roots, diskless workstations, etc. 74 rm -f /var/db/entropy 75 if touch /var/db/entropy; then 76 entropy_file_confirmed=/var/db/entropy 77 fi 78 fi 79 case ${entropy_file_confirmed} in 80 '') 81 err 1 '${entropy_file_confirmed}:' \ 82 ' entropy file write failed.' 83 ;; 84 *) 85 dd if=/dev/random of=${entropy_file_confirmed} \ 86 bs=4096 count=1 2> /dev/null 87 echo '.' 88 ;; 89 esac 90 umask ${oumask} 91 ;; 92 esac 93} 94 95load_rc_config $name 96run_rc_command "$1" 97