aboutsummaryrefslogtreecommitdiffstats
path: root/rc.d/init.d/random
blob: 3375141bcc3507cbfd8e675f20abc2b17ada5933 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
#!/bin/sh
#
# random	Script to snapshot random state and reload it at boot time.
#
# Author:       Theodore Ts'o <tytso@mit.edu>
#
# chkconfig: 2345 20 80
# description: Saves and restores system entropy pool for higher quality \
#              random number generation.

# Source function library.
. /etc/rc.d/init.d/functions

random_seed=/var/run/random-seed

# See how we were called.
case "$1" in
  start)
	# Carry a random seed from start-up to start-up
	# Load and then save 512 bytes, which is the size of the entropy pool
	if [ -f $random_seed ]; then
		cmd="cat $random_seed >/dev/urandom"
	else
		cmd="touch $random_seed"
	fi
	action "Initializing random number generator" $cmd
	chmod 600 $random_seed
	dd if=/dev/urandom of=$random_seed count=1 bs=512 2>/dev/null
	touch /var/lock/subsys/random

	;;
  stop)
	# Carry a random seed from shut-down to start-up
	# Save 512 bytes, which is the size of the entropy pool
	touch $random_seed
	chmod 600 $random_seed
	action "Saving random seed" dd if=/dev/urandom of=$random_seed count=1 bs=512 2>/dev/null
	
	rm -f /var/lock/subsys/random
	;;
  status)
	# this is way overkill, but at least we have some status output...
	if [ -c /dev/random ] ; then
		echo "The random data source exists"
	else
		echo "The random data source is missing"
	fi
	;;
  restart|reload)
	# do not do anything; this is unreasonable
	:
	;;
  *)
	# do not advertise unreasonable commands that there is no reason
	# to use with this device
	echo "Usage: random {start|stop|status|restart|reload}"
	exit 1
esac

exit 0