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#!/usr/bin/python
#
# bashreadline Print entered bash commands from all running shells.
# For Linux, uses BCC, eBPF. Embedded C.
#
# This works by tracing the readline() function using a uretprobe (uprobes).
#
# Copyright 2016 Netflix, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 28-Jan-2016 Brendan Gregg Created this.
from __future__ import print_function
from bcc import BPF
from time import strftime
# load BPF program
bpf_text = """
#include <uapi/linux/ptrace.h>
int printret(struct pt_regs *ctx) {
if (!ctx->ax)
return 0;
char str[80] = {};
bpf_probe_read(&str, sizeof(str), (void *)PT_REGS_RC(ctx));
bpf_trace_printk("%s\\n", &str);
return 0;
};
"""
b = BPF(text=bpf_text)
b.attach_uretprobe(name="/bin/bash", sym="readline", fn_name="printret")
# header
print("%-9s %-6s %s" % ("TIME", "PID", "COMMAND"))
# format output
while 1:
try:
(task, pid, cpu, flags, ts, msg) = b.trace_fields()
except ValueError:
continue
print("%-9s %-6d %s" % (strftime("%H:%M:%S"), pid, msg))
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