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#!/bin/sh
#
# Wrapper script to advice programs to use the temporary or public IPv6 addresses
#
# Symlink to "v6tmp" and "v6pub" and adjust library locations
#
# By Stefan Tomanek <stefan.tomanek@wertarbyte.de>
# https://github.com/wertarbyte/ipv6pref/
#
# You have permission to copy, modify, and redistribute under the
# terms of the GPLv3 or any later version.
# For full license terms, see COPYING.
LIB_NAME="ipv6pref/ipv6pref.so"
# directories to search for the library
LIB_DIRS="/usr/local/lib/ /usr/lib/"
dbg() {
[ "${IPV6PREF_DEBUG:-}" ] || return
echo "ipv6pref:" "$@" >&2
}
find_lib() {
for D in $LIB_DIRS; do
LIB="${D}/${LIB_NAME}"
if [ -e "$LIB" ]; then
echo "$LIB"
return 0
fi
done
echo "Unable to locate library '$LIB_NAME' in $LIB_DIRS" >&2
return 1
}
if ! [ "${IPV6PREF_WAS_HERE:-}" ]; then
# locate the library
LIB="$(find_lib)"
if [ "$?" -eq 0 ]; then
export LD_PRELOAD="${LIB} ${LD_PRELOAD}"
fi
# check wrapper name
WRAPPER="$(basename $0)"
case "$WRAPPER" in
v6pub)
dbg "Using public address by default"
export IPV6PREF_ADDR="pub"
;;
v6tmp)
dbg "Using temporary address by default"
export IPV6PREF_ADDR="tmp"
;;
esac
# check for argument
case "${1:-}" in
"-p")
dbg "Using public address"
export IPV6PREF_ADDR="pub"
shift
;;
"-t")
dbg "Using temporary address"
export IPV6PREF_ADDR="tmp"
shift
;;
esac
fi
IPV6PREF_WAS_HERE=1 exec "$@"
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