android-raptor – Blame information for rev 2
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Rev | Author | Line No. | Line |
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2 | office | 1 | #!/bin/sh |
1 | office | 2 | # |
3 | # urandom This script saves the random seed between reboots. |
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4 | # It is called from the boot, halt and reboot scripts. |
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5 | # |
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6 | # Version: @(#)urandom 1.33 22-Jun-1998 miquels@cistron.nl |
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7 | # |
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8 | |||
9 | [ -c /dev/urandom ] || exit 0 |
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10 | #. /etc/default/rcS |
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11 | |||
12 | case "$1" in |
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13 | start|"") |
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14 | # check for read only file system |
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15 | if ! touch /etc/random-seed 2>/dev/null |
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16 | then |
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17 | echo "read-only file system detected...done" |
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18 | exit |
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19 | fi |
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20 | if [ "$VERBOSE" != no ] |
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21 | then |
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22 | printf "Initializing random number generator... " |
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23 | fi |
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24 | # Load and then save 512 bytes, |
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25 | # which is the size of the entropy pool |
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26 | cat /etc/random-seed >/dev/urandom |
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27 | rm -f /etc/random-seed |
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28 | umask 077 |
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29 | dd if=/dev/urandom of=/etc/random-seed count=1 \ |
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30 | >/dev/null 2>&1 || echo "urandom start: failed." |
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31 | umask 022 |
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32 | [ "$VERBOSE" != no ] && echo "done." |
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33 | ;; |
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34 | stop) |
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35 | if ! touch /etc/random-seed 2>/dev/null |
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36 | then |
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37 | exit |
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38 | fi |
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39 | # Carry a random seed from shut-down to start-up; |
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40 | # see documentation in linux/drivers/char/random.c |
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41 | [ "$VERBOSE" != no ] && printf "Saving random seed... " |
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42 | umask 077 |
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43 | dd if=/dev/urandom of=/etc/random-seed count=1 \ |
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44 | >/dev/null 2>&1 || echo "urandom stop: failed." |
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45 | [ "$VERBOSE" != no ] && echo "done." |
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46 | ;; |
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47 | *) |
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48 | echo "Usage: urandom {start|stop}" >&2 |
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49 | exit 1 |
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50 | ;; |
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51 | esac |