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#!/bin/sh -eu
#
# SPDX-License-Identifier: AGPL-3.0-or-later
#
# SEITAN - Syscall Expressive Interpreter, Transformer and Notifier
#
# filter.sh - Build binary-search tree BPF program with SECCOMP_RET_USER_NOTIF
#
# Copyright (c) 2022 Red Hat GmbH
# Author: Stefano Brivio <sbrivio@redhat.com>
IN="${@}"
OUT_NUMBERS="common/numbers.h"
HEADER_NUMBERS="/* This file was automatically generated by $(basename ${0}) */
#ifndef NUMBERS_H_
#define NUMBERS_H_
struct syscall_numbers {
char name[1024];
long number;
};
struct syscall_numbers numbers[] = {"
FOOTER_NUMBERS="};
#endif"
syscalls=(
"accept"
"bind"
"connect"
"getpeername"
"getsockname"
"getsockopt"
"listen"
"mount"
"openat"
"recvfrom"
"recvmmsg"
"recvmsg"
"sendmmsg"
"sendmsg"
"sendto"
"setsockopt"
"shutdown"
"socket"
"socketpair"
)
printf '%s\n' "${HEADER_NUMBERS}" > "${OUT_NUMBERS}"
# syscall_nr - Get syscall number from compiler, also note in numbers.h
__in="$(printf "#include <asm-generic/unistd.h>\n#include <sys/syscall.h>\n__NR_%s" ${syscalls[@]})"
__out="$(echo "${__in}" |cc -E -xc - -o - |sed -n '/\#.*$/!p'| sed '/^$/d')"
awk -v AS="${syscalls[*]}" -v BS="${__out[*]}" \
'BEGIN { MAX=split(AS,a, / /); split(BS,b, / /);
for (x = 1; x <= MAX; x++)
{ printf "\t{\"%s\",\t%d},\n", a[x], b[x] }
}' >> "${OUT_NUMBERS}"
printf '%s\n' "${FOOTER_NUMBERS}" >> "${OUT_NUMBERS}"
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