/usr/bin/withsctp is in lksctp-tools 1.0.17+dfsg-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh
# -*- sh -*-
LIBDIR=/usr/lib/x86_64-linux-gnu/lksctp-tools
BINDIR=/usr/bin
export LD_PRELOAD=${LIBDIR}/libwithsctp.so.1.0.17
if ! ${BINDIR}/checksctp 2> /dev/null
then
${BINDIR}/checksctp;
exit 1;
fi
exec "$@"
|