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#!/bin/bash
# Copyright (C) 2023 Pasha <pasha@bell01.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
show_version() {
echo "0.1a"
exit 1
}
show_usage() {
echo "Usage: $0 bpf_program_path container_id"
echo "example: $0 /usr/sbin/execsnoop-bpfcc \$(docker inspect --format=\"{{.Id}}\" 119cb41a9e09)"
echo " $0 /usr/sbin/execsnoop-bpfcc \$(kubectl get pods -o jsonpath='{range .items[*].status.containerStatuses[*]}{.containerID}{\"\n\"}{end}' --field-selector metadata.name=test-deployment-7f456874f4-mxjg4 | cut -b 10-)"
exit 1
}
if [[ "$1" == "-v" ]]; then
show_version
fi
if [ -z "$1" ] || [ -z "$2" ]; then
show_usage
fi
bpf_prog_path=$1
containerid=$2
echo "creating bpf map"
BPF_FILE=/sys/fs/bpf/$containerid
if [ -f "$BPF_FILE" ]; then
echo "error bpf map exists."
echo "please unmap or remove \"$BPF_FILE\" and try again."
exit 1
fi
echo $BPF_FILE
/usr/sbin/bpftool map create $BPF_FILE type hash key 8 value 8 entries 128 name cgroupset flags 0
cgroupid=$(containercgroup id $containerid)
if [ -z "$cgroupid" ]
then
echo "invalid container id"
echo "removing bpf map"
rm $BPF_FILE
exit 1
fi
echo "cgroupid: $cgroupid"
/usr/sbin/bpftool map update pinned $BPF_FILE key hex $cgroupid value hex 00 00 00 00 00 00 00 00 any
$bpf_prog_path --cgroup $BPF_FILE
echo "removing bpf map"
rm $BPF_FILE
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