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#!/bin/sh
###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
# text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2010 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU General Public License, as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any
# later version. Please see the file LICENSE-GPL for details.
#
# Web Page: http://mielke.cc/brltty/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################
# Generate a key for BrlAPI.
# Usage: brltty-genkey [/path/to/file]
programName="${0}"
programMessage() {
echo "${programName}: ${1}"
}
syntaxError() {
programMessage "${1}"
exit 2
}
try() {
("${@}"; exit "${?}") 2>/dev/null && exit 0
}
if [ "${#}" -eq 0 ]
then
. "`dirname "${0}"`/brltty-config" || exit "${?}"
file="${BRLTTY_EXECUTE_ROOT}${sysconfdir}/${BRLAPI_AUTHKEYFILE}"
elif [ "${#}" -eq 1 ]
then
file="${1}"
else
syntaxError "too many parameters."
fi
umask 077
try mcookie >"${file}"
for device in "/dev/urandom" "/dev/random"
do
[ -c "${device}" -a -r "${device}" ] && {
try dd if="${device}" of="${file}" bs=32 count=1
}
done
key="${RANDOM}"
[ -n "${key}" ] && {
try echo >"${file}" "${key}"
}
programMessage "no known mechanism is supported."
rm -f -- "${file}"
exit 3
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