[1108] | 1 | #!/bin/bash |
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| 2 | # |
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| 3 | # random Script to snapshot random state and reload it at boot time. |
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| 4 | # |
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| 5 | # Author: Theodore Ts'o <tytso@mit.edu> |
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| 6 | # |
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| 7 | # chkconfig: 2345 20 80 |
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| 8 | # description: Saves and restores system entropy pool for higher quality \ |
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| 9 | # random number generation. |
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| 10 | |
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| 11 | # Source function library. |
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| 12 | . /etc/init.d/functions |
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| 13 | |
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| 14 | random_seed=/var/lib/random-seed |
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| 15 | |
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| 16 | # See how we were called. |
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| 17 | case "$1" in |
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| 18 | start) |
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| 19 | # Carry a random seed from start-up to start-up |
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| 20 | # Load and then save 512 bytes, which is the size of the entropy pool |
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| 21 | if [ -f $random_seed ]; then |
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| 22 | cat $random_seed >/dev/urandom |
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| 23 | else |
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| 24 | touch $random_seed |
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| 25 | fi |
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| 26 | action $"Initializing random number generator: " /bin/true |
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| 27 | chmod 600 $random_seed |
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| 28 | dd if=/dev/urandom of=$random_seed count=1 bs=512 2>/dev/null |
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| 29 | touch /var/lock/subsys/random |
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| 30 | |
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| 31 | ;; |
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| 32 | stop) |
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| 33 | # Carry a random seed from shut-down to start-up |
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| 34 | # Save 512 bytes, which is the size of the entropy pool |
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| 35 | touch $random_seed |
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| 36 | chmod 600 $random_seed |
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| 37 | action $"Saving random seed: " dd if=/dev/urandom of=$random_seed count=1 bs=512 2>/dev/null |
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| 38 | |
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| 39 | rm -f /var/lock/subsys/random |
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| 40 | ;; |
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| 41 | status) |
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| 42 | # this is way overkill, but at least we have some status output... |
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| 43 | if [ -c /dev/random ] ; then |
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| 44 | echo $"The random data source exists" |
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| 45 | else |
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| 46 | echo $"The random data source is missing" |
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| 47 | fi |
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| 48 | ;; |
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| 49 | restart|reload) |
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| 50 | # do not do anything; this is unreasonable |
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| 51 | : |
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| 52 | ;; |
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| 53 | *) |
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| 54 | # do not advertise unreasonable commands that there is no reason |
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| 55 | # to use with this device |
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| 56 | echo $"Usage: $0 {start|stop|status|restart|reload}" |
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| 57 | exit 1 |
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| 58 | esac |
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| 59 | |
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| 60 | exit 0 |
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| 61 | |
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