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#!/usr/bin/python3
import sys
import time
from bcc import BPF
src = r"""
BPF_RINGBUF_OUTPUT(buffer, 1 << 4);
struct event {
char filename[64];
int dfd;
int flags;
int mode;
};
TRACEPOINT_PROBE(syscalls, sys_enter_openat) {
int zero = 0;
struct event *event = buffer.ringbuf_reserve(sizeof(struct event));
if (!event) {
return 1;
}
bpf_probe_read_user_str(event->filename, sizeof(event->filename), args->filename);
event->dfd = args->dfd;
event->flags = args->flags;
event->mode = args->mode;
buffer.ringbuf_submit(event, 0);
// or, to discard: buffer.ringbuf_discard(event, 0);
return 0;
}
"""
b = BPF(text=src)
def callback(ctx, data, size):
event = b['buffer'].event(data)
print("%-64s %10d %10d %10d" % (event.filename.decode('utf-8'), event.dfd, event.flags, event.mode))
b['buffer'].open_ring_buffer(callback)
print("Printing openat() calls, ctrl-c to exit.")
print("%-64s %10s %10s %10s" % ("FILENAME", "DIR_FD", "FLAGS", "MODE"))
try:
while 1:
b.ring_buffer_consume()
time.sleep(0.5)
except KeyboardInterrupt:
sys.exit()
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