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