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Copy pathkillsnoop.py
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executable file
·106 lines (89 loc) · 2.64 KB
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#!/usr/bin/python
# @lint-avoid-python-3-compatibility-imports
#
# killsnoop Trace signals issued by the kill() syscall.
# For Linux, uses BCC, eBPF. Embedded C.
#
# USAGE: killsnoop [-h] [-t] [-x] [-p PID]
#
# Copyright (c) 2015 Brendan Gregg.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 20-Sep-2015 Brendan Gregg Created this.
from __future__ import print_function
from bcc import BPF
import argparse
# arguments
examples = """examples:
./killsnoop # trace all kill() signals
./killsnoop -t # include timestamps
./killsnoop -x # only show failed kills
./killsnoop -p 181 # only trace PID 181
"""
parser = argparse.ArgumentParser(
description="Trace signals issued by the kill() syscall",
formatter_class=argparse.RawDescriptionHelpFormatter,
epilog=examples)
parser.add_argument("-t", "--timestamp", action="store_true",
help="include timestamp on output")
parser.add_argument("-x", "--failed", action="store_true",
help="only show failed opens")
parser.add_argument("-p", "--pid",
help="trace this PID only")
args = parser.parse_args()
debug = 0
# define BPF program
bpf_text = """
#include <uapi/linux/ptrace.h>
BPF_HASH(args_pid, u32, int);
BPF_HASH(args_sig, u32, int);
int kprobe__sys_kill(struct pt_regs *ctx, int tpid, int sig)
{
u32 pid = bpf_get_current_pid_tgid();
FILTER
args_pid.update(&pid, &tpid);
args_sig.update(&pid, &sig);
return 0;
};
int kretprobe__sys_kill(struct pt_regs *ctx)
{
int *tpidp, *sigp, ret = ctx->ax;
u32 pid = bpf_get_current_pid_tgid();
tpidp = args_pid.lookup(&pid);
sigp = args_sig.lookup(&pid);
if (tpidp == 0 || sigp == 0) {
return 0; // missed entry
}
bpf_trace_printk("%d %d %d\\n", *tpidp, *sigp, ret);
args_pid.delete(&pid);
args_sig.delete(&pid);
return 0;
}
"""
if args.pid:
bpf_text = bpf_text.replace('FILTER',
'if (pid != %s) { return 0; }' % args.pid)
else:
bpf_text = bpf_text.replace('FILTER', '')
if debug:
print(bpf_text)
# initialize BPF
b = BPF(text=bpf_text)
# header
if args.timestamp:
print("%-14s" % ("TIME(s)"), end="")
print("%-6s %-16s %-4s %-6s %s" % ("PID", "COMM", "SIG", "TPID", "RESULT"))
start_ts = 0
# format output
while 1:
(task, pid, cpu, flags, ts, msg) = b.trace_fields()
(tpid_s, sig_s, ret_s) = msg.split(" ")
ret = int(ret_s)
if (args.failed and (ret >= 0)):
continue
# print columns
if args.timestamp:
if start_ts == 0:
start_ts = ts
print("%-14.9f" % (ts - start_ts), end="")
print("%-6d %-16s %-4s %-6s %s" % (pid, task, sig_s, tpid_s, ret_s))