#!/bin/sh
#
# Check how SCM_RIGHTS and SCM_CREDENTIALS control messages are decoded in -y mode.
#
# Copyright (c) 2014-2015 Dmitry V. Levin <ldv@strace.io>
# Copyright (c) 2014-2021 The strace developers.
# All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0-or-later

. "${srcdir=.}/init.sh"

# strace -y is implemented using /proc/$pid/fd
[ -d /proc/self/fd/ ] ||
	framework_skip_ '/proc/self/fd/ is not available'

check_prog mkdir
check_prog seq
check_prog touch

mkdir dir ||
	framework_skip_ 'failed to create a directory'

file="dir/$(for i in $(seq 1 127); do echo A; done; echo Z)"

touch -- "$file" ||
	framework_skip_ 'failed to create a file'

run_prog ../scm_rights /dev/zero
run_strace -y -x -e%network $args "$file"

hex='[[:xdigit:]]'
n='[1-9][0-9]*'
sample="$(for i in $(seq 1 15); do printf '\\\\xf%x' $i; done)"
socket='<socket:\[[0-9]+\]>'

path6='(/.*/(A\\n){127}Z|\\x2f(\\x'"$hex$hex"')*\\x2f(\\x41\\x0a){127}\\x5a)'
rights_data='\[4</dev/null>, 5</dev/zero>, 6<'"$path6"'>\]'
iov='\[\{iov_base="'"$sample"'", iov_len=15\}\]'
ids='\{pid='"$n"', uid=[0-9]+, gid=[0-9]+\}'

msg_head='\{msg_name=NULL, msg_namelen=0, msg_iov='"$iov"', msg_iovlen=1, msg_control='
msg_tail=', msg_controllen='"$n"', msg_flags=0'
rights='\{cmsg_len='"$n"', cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data='"$rights_data"'\}'
creds='\{cmsg_len='"$n"', cmsg_level=SOL_SOCKET, cmsg_type=SCM_CREDENTIALS, cmsg_data='"$ids"'\}'

cat > "$EXP" << __EOF__
sendmsg\\(3$socket, $msg_head\\[$rights\\]$msg_tail\\}, 0\\) = 15
recvmsg\\(0$socket, $msg_head\\[$creds, $rights\\]$msg_tail\\}, 0\\) = 15
__EOF__

match_grep "$LOG" "$EXP"
