etc/rc.d/random

   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
  14 name="random"
  15 start_cmd="random_start"
  16 stop_cmd="random_stop"
  17
  18 feed_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
  27 random_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
  56 random_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
  95 load_rc_config $name
  96 run_rc_command "$1"