etc/rc.d/initrandom

   1 #!/bin/sh
   2 #
   3 # $FreeBSD$
   4 #
   5
   6 # PROVIDE: initrandom
   7 # REQUIRE: initdiskless
   8 # BEFORE: disks
   9 # KEYWORD: nojail
  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 "${1}" ]; then
  20                 cat "${1}" | dd of=/dev/random bs=8k 2>/dev/null
  21         fi
  22 }
  23
  24 initrandom_start()
  25 {
  26         soft_random_generator=`sysctl kern.random 2>/dev/null`
  27
  28         echo -n 'Entropy harvesting:'
  29
  30         if [ \! -z "${soft_random_generator}" ] ; then
  31
  32                 if checkyesno harvest_interrupt; then
  33                         if [ -w /dev/random ]; then
  34                                 ${SYSCTL_W} kern.random.sys.harvest.interrupt=1 >/dev/null
  35                                 echo -n ' interrupts'
  36                         fi
  37                 fi
  38
  39                 if checkyesno harvest_ethernet; then
  40                         if [ -w /dev/random ]; then
  41                                 ${SYSCTL_W} kern.random.sys.harvest.ethernet=1 >/dev/null
  42                                 echo -n ' ethernet'
  43                         fi
  44                 fi
  45
  46                 if checkyesno harvest_p_to_p; then
  47                         if [ -w /dev/random ]; then
  48                         ${SYSCTL_W} kern.random.sys.harvest.point_to_point=1 >/dev/null
  49                                 echo -n ' point_to_point'
  50                         fi
  51                 fi
  52
  53                 # XXX temporary until we can improve the entropy
  54                 # harvesting rate.
  55                 # Entropy below is not great, but better than nothing.
  56                 # This unblocks the generator at startup
  57                 ( ps -fauxww; sysctl -a; date; df -ib; dmesg; ps -fauxww; ) \
  58                     | dd of=/dev/random bs=8k 2>/dev/null
  59                 cat /bin/ls | dd of=/dev/random bs=8k 2>/dev/null
  60
  61                 # First pass at reseeding /dev/random.
  62                 #
  63                 case ${entropy_file} in
  64                 [Nn][Oo] | '')
  65                         ;;
  66                 *)
  67                         if [ -w /dev/random ]; then
  68                                 feed_dev_random "${entropy_file}"
  69                         fi
  70                         ;;
  71                 esac
  72
  73                 echo -n ' kickstart'
  74         fi
  75
  76         echo '.'
  77 }
  78
  79 load_rc_config random
  80 run_rc_command "$1"