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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