etc/rc.d/initrandom

   1 #!/bin/sh
   2 #
   3 # $FreeBSD: src/etc/rc.d/initrandom,v 1.1 2002/06/13 22:14:36 gordon Exp $
   4 # $DragonFly: src/etc/rc.d/initrandom,v 1.6 2006/07/10 22:19:14 dillon Exp $
   5 #
   6
   7 # PROVIDE: initrandom
   8 # REQUIRE: initdiskless
   9 # BEFORE: disks
  10
  11 . /etc/rc.subr
  12
  13 name="initrandom"
  14 start_cmd="initrandom_start"
  15 stop_cmd=":"
  16
  17 feed_dev_random()
  18 {
  19         if [ -f "${1}" -a -r "${1}" -a -s "${1}" ]; then
  20                 sysctl kern.seedenable=1 >/dev/null
  21                 cat "${1}" | dd of=/dev/random bs=8k 2>/dev/null
  22                 sysctl kern.seedenable=0 >/dev/null
  23         fi
  24 }
  25
  26 initrandom_start()
  27 {
  28         # First pass at reseeding /dev/random.
  29         #
  30         case ${entropy_file} in
  31         [Nn][Oo] | '')
  32                 ;;
  33         *)
  34                 if [ -w /dev/random ]; then
  35                         feed_dev_random "${entropy_file}"
  36                 fi
  37                 ;;
  38         esac
  39
  40         # Mix in more junk.  At the very least this will make seeding a
  41         # bit more machine specific.  The sysctl -a will also catch the
  42         # TSC, 8254, and a few other things that tend to be somewhat more
  43         # random (even from a CD boot) so it isn't all that bad.
  44         #
  45         echo -n 'Initializing random seed: '
  46         sysctl kern.seedenable=1 >/dev/null
  47         ( ps -fauxww; sysctl -a; date; df -ib; dmesg; ps -fauxww; ) \
  48             2>&1 | dd of=/dev/random bs=8k 2>/dev/null
  49         cat /bin/ls | dd of=/dev/random bs=8k 2>/dev/null
  50         sysctl kern.seedenable=0 >/dev/null
  51         echo 'done. '
  52 }
  53
  54 load_rc_config random
  55 run_rc_command "$1"