diff options
Diffstat (limited to 'meta/recipes-core/initscripts/initscripts-1.0/urandom')
-rwxr-xr-x | meta/recipes-core/initscripts/initscripts-1.0/urandom | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/meta/recipes-core/initscripts/initscripts-1.0/urandom b/meta/recipes-core/initscripts/initscripts-1.0/urandom new file mode 100755 index 0000000000..b6d807cf3b --- /dev/null +++ b/meta/recipes-core/initscripts/initscripts-1.0/urandom | |||
@@ -0,0 +1,46 @@ | |||
1 | #! /bin/sh | ||
2 | ### BEGIN INIT INFO | ||
3 | # Provides: urandom | ||
4 | # Required-Start: $local_fs mountvirtfs | ||
5 | # Required-Stop: $local_fs | ||
6 | # Default-Start: S | ||
7 | # Default-Stop: 0 6 | ||
8 | # Short-Description: Save and restore the random seed | ||
9 | # Description: Save the random seed on shutdown and restore it on boot, | ||
10 | # to ensure that the seed isn't predicable on startup | ||
11 | # (because the boot process is predictable) | ||
12 | ### END INIT INFO | ||
13 | |||
14 | test -c /dev/urandom || exit 0 | ||
15 | . /etc/default/rcS | ||
16 | |||
17 | case "$1" in | ||
18 | start|"") | ||
19 | test "$VERBOSE" != no && echo "Initializing random number generator..." | ||
20 | # Load and then save 512 bytes, | ||
21 | # which is the size of the entropy pool | ||
22 | if test -f /var/lib/urandom/random-seed | ||
23 | then | ||
24 | cat /var/lib/urandom/random-seed >/dev/urandom | ||
25 | fi | ||
26 | rm -f /var/lib/urandom/random-seed | ||
27 | umask 077 | ||
28 | dd if=/dev/urandom of=/var/lib/urandom/random-seed count=1 \ | ||
29 | >/dev/null 2>&1 || echo "urandom start: failed." | ||
30 | umask 022 | ||
31 | ;; | ||
32 | stop) | ||
33 | # Carry a random seed from shut-down to start-up; | ||
34 | # see documentation in linux/drivers/char/random.c | ||
35 | test "$VERBOSE" != no && echo "Saving random seed..." | ||
36 | umask 077 | ||
37 | dd if=/dev/urandom of=/var/lib/urandom/random-seed count=1 \ | ||
38 | >/dev/null 2>&1 || echo "urandom stop: failed." | ||
39 | ;; | ||
40 | *) | ||
41 | echo "Usage: urandom {start|stop}" >&2 | ||
42 | exit 1 | ||
43 | ;; | ||
44 | esac | ||
45 | |||
46 | exit 0 | ||