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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
# Copyright (C) 2017-2018 Peter Wu <peter@lekensteyn.nl>. All Rights Reserved.
set -e
ME_DIR="${BASH_SOURCE[0]}"
ME_DIR="${ME_DIR%/*}"
source "$ME_DIR/offsets.include" || { echo "Did you forget to run make?" >&2; exit 1; }
case "$(uname -m)" in
x86_64) ARGUMENT_REGISTER="%si" ;;
i386|i686) ARGUMENT_REGISTER="%dx" ;;
aarch64) ARGUMENT_REGISTER="%x1" ;;
arm) ARGUMENT_REGISTER="%r1" ;;
*) echo "ERROR: Unknown architecture" >&2; exit 1 ;;
esac
ARGS=( )
REGEX=".*: idxadd: .*"
for key in "${!OFFSETS[@]}"; do
values="${OFFSETS[$key]}"
values=( ${values//,/ } )
for i in {0..3}; do
value="$ARGUMENT_REGISTER"
for indirection in "${values[@]:1}"; do
value="+$indirection($value)"
done
value="+$((i * 8 + values[0]))($value)"
ARGS+=( "${key,,}$i=$value:x64" )
REGEX="$REGEX ${key,,}$i=0x([0-9a-f]+)"
done
done
turn_off() {
set +e
[[ -f /sys/kernel/debug/tracing/events/wireguard/idxadd/enable ]] || exit
echo 0 > /sys/kernel/debug/tracing/events/wireguard/idxadd/enable
echo "-:wireguard/idxadd" >> /sys/kernel/debug/tracing/kprobe_events
exit
}
trap turn_off INT TERM EXIT
echo "p:wireguard/idxadd index_hashtable_insert ${ARGS[*]}" >> /sys/kernel/debug/tracing/kprobe_events
echo 1 > /sys/kernel/debug/tracing/events/wireguard/idxadd/enable
unpack_u64() {
local i expanded="$1"
if [[ $ENDIAN == big ]]; then
printf -v expanded "%.*s$expanded" $((16 - ${#expanded})) 0000000000000000
for i in {0..7}; do
echo -n "\\x${expanded:(i * 2):2}"
done
elif [[ $ENDIAN == little ]]; then
(( ${#expanded} % 2 == 1 )) && expanded="0$expanded"
expanded="${expanded}0000000000000000"
for i in {0..7}; do
echo -n "\\x${expanded:((7 - i) * 2):2}"
done
else
echo "ERROR: Unable to determine endian" >&2
exit 1
fi
}
while read -r line; do
[[ $line =~ $REGEX ]] || continue
echo "New handshake session:"
j=1
for key in "${!OFFSETS[@]}"; do
bytes=""
for i in {0..3}; do
bytes="$bytes$(unpack_u64 "${BASH_REMATCH[j]}")"
((++j))
done
echo " $key = $(printf "$bytes" | base64)"
done
done < /sys/kernel/debug/tracing/trace_pipe
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