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#! /usr/bin/python3
#
# bashreadline Print entered bash commands from all running shells.
# For Linux, uses BCC, eBPF. Embedded C.
#
# USAGE: bashreadline [-s SHARED]
# This works by tracing the readline() function using a uretprobe (uprobes).
# When you failed to run the script directly with error:
# `Exception: could not determine address of symbol b'readline'`,
# you may need specify the location of libreadline.so library
# with `-s` option.
#
# Copyright 2016 Netflix, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 28-Jan-2016 Brendan Gregg Created this.
# 12-Feb-2016 Allan McAleavy migrated to BPF_PERF_OUTPUT
from __future__ import print_function
from bcc import BPF
from time import strftime
import argparse
parser = argparse.ArgumentParser(
description="Print entered bash commands from all running shells",
formatter_class=argparse.RawDescriptionHelpFormatter)
parser.add_argument("-s", "--shared", nargs="?",
const="/lib/libreadline.so", type=str,
help="specify the location of libreadline.so library.\
Default is /lib/libreadline.so")
args = parser.parse_args()
name = args.shared if args.shared else "/bin/bash"
# load BPF program
bpf_text = """
#include <uapi/linux/ptrace.h>
#include <linux/sched.h>
struct str_t {
u32 pid;
char str[80];
};
BPF_PERF_OUTPUT(events);
int printret(struct pt_regs *ctx) {
struct str_t data = {};
char comm[TASK_COMM_LEN] = {};
if (!PT_REGS_RC(ctx))
return 0;
data.pid = bpf_get_current_pid_tgid() >> 32;
bpf_probe_read_user(&data.str, sizeof(data.str), (void *)PT_REGS_RC(ctx));
bpf_get_current_comm(&comm, sizeof(comm));
if (comm[0] == 'b' && comm[1] == 'a' && comm[2] == 's' && comm[3] == 'h' && comm[4] == 0 ) {
events.perf_submit(ctx,&data,sizeof(data));
}
return 0;
};
"""
b = BPF(text=bpf_text)
b.attach_uretprobe(name=name, sym="readline", fn_name="printret")
# header
print("%-9s %-7s %s" % ("TIME", "PID", "COMMAND"))
def print_event(cpu, data, size):
event = b["events"].event(data)
print("%-9s %-7d %s" % (strftime("%H:%M:%S"), event.pid,
event.str.decode('utf-8', 'replace')))
b["events"].open_perf_buffer(print_event)
while 1:
try:
b.perf_buffer_poll()
except KeyboardInterrupt:
exit()
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