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 1.3 2005/11/19 21:47:32 swildner 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 "${1}" ]; then
  21                 cat "${1}" | dd of=/dev/random bs=8k 2>/dev/null
  22         fi
  23 }
  24
  25 random_start()
  26 {
  27         # Reseed /dev/random with previously stored entropy.
  28         case ${entropy_dir} in
  29         [Nn][Oo])
  30                 ;;
  31         *)
  32                 entropy_dir=${entropy_dir:-/var/db/entropy}
  33                 if [ -d "${entropy_dir}" ]; then
  34                         if [ -w /dev/random ]; then
  35                                 for seedfile in ${entropy_dir}/*; do
  36                                         feed_dev_random "${seedfile}"
  37                                 done
  38                         fi
  39                 fi
  40                 ;;
  41         esac
  42
  43         case ${entropy_file} in
  44         [Nn][Oo] | '')
  45                 ;;
  46         *)
  47                 if [ -w /dev/random ]; then
  48                         feed_dev_random "${entropy_file}"
  49                 fi
  50                 ;;
  51         esac
  52 }
  53
  54 random_stop()
  55 {
  56         # Write some entropy so when the machine reebots /dev/random
  57         # can be reseeded
  58         #
  59         case ${entropy_file} in
  60         [Nn][Oo] | '')
  61                 ;;
  62         *)
  63                 echo -n 'Writing entropy file:'
  64                 rm -f ${entropy_file}
  65                 oumask=`umask`
  66                 umask 077
  67                 if touch ${entropy_file}; then
  68                         entropy_file_confirmed="${entropy_file}"
  69                 else
  70                         # Try this as a reasonable alternative for read-only
  71                         # roots, diskless workstations, etc.
  72                         rm -f /var/db/entropy
  73                         if touch /var/db/entropy; then
  74                                 entropy_file_confirmed=/var/db/entropy
  75                         fi
  76                 fi
  77                 case ${entropy_file_confirmed} in
  78                 '')
  79                         err 1 '${entropy_file_confirmed}:' \
  80                             ' entropy file write failed.'
  81                         ;;
  82                 *)
  83                         dd if=/dev/random of=${entropy_file_confirmed} \
  84                            bs=4096 count=1 2> /dev/null
  85                         echo '.'
  86                         ;;
  87                 esac
  88                 umask ${oumask}
  89                 ;;
  90         esac
  91 }
  92
  93 load_rc_config $name
  94 run_rc_command "$1"