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uprobe-readline.lua
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#!/usr/bin/env bcc-lua --[[ Copyright 2016 Marek Vavrusa <mvavrusa@cloudflare.com> Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ]] -- Trace readline() call from all bash instances (print bash commands from all running shells). -- This is rough equivallent to `bashreadline` -- Source: http://www.brendangregg.com/blog/2016-02-08/linux-ebpf-bcc-uprobes.html local ffi = require('ffi') local bpf = require('bpf') local S = require('syscall') -- Kernel-space part of the program local probe = bpf.uprobe('/bin/bash:readline', function (ptregs) local line = ffi.new('char [40]') -- Create a 40 byte buffer on stack ffi.copy(line, ffi.cast('char *', ptregs.ax)) -- Cast `ax` to string pointer and copy to buffer print('%s\n', line) -- Print to trace_pipe end, true, -1, 0) -- User-space part of the program local ok, err = pcall(function() local log = bpf.tracelog() print(' TASK-PID CPU# TIMESTAMP FUNCTION') print(' | | | | |') while true do print(log:read()) end end)