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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../https://github.com/eunomia-bpf/bpf-developer-tutorial.html">https://github.com/eunomia-bpf/bpf-developer-tutorial</a></li><li class="chapter-item expanded affix "><li class="part-title">目录</li><li class="chapter-item expanded "><a href="../0-introduce/index.html"><strong aria-hidden="true">1.</strong> 介绍 eBPF 的基本概念、常见的开发工具</a></li><li class="chapter-item expanded "><a href="../1-helloworld/index.html"><strong aria-hidden="true">2.</strong> eBPF Hello World，基本框架和开发流程</a></li><li class="chapter-item expanded "><a href="../2-kprobe-unlink/index.html"><strong aria-hidden="true">3.</strong> 使用 kprobe 监测捕获 unlink 系统调用</a></li><li class="chapter-item expanded "><a href="../3-fentry-unlink/index.html"><strong aria-hidden="true">4.</strong> 使用 fentry 监测捕获 unlink 系统调用</a></li><li class="chapter-item expanded "><a href="../4-opensnoop/index.html"><strong aria-hidden="true">5.</strong> 捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid</a></li><li class="chapter-item expanded "><a href="../5-uprobe-bashreadline/index.html"><strong aria-hidden="true">6.</strong> 使用 uprobe 捕获 bash 的 readline 函数调用</a></li><li class="chapter-item expanded "><a href="../6-sigsnoop/index.html" class="active"><strong aria-hidden="true">7.</strong> 捕获进程发送信号的系统调用集合，使用 hash map 保存状态</a></li><li class="chapter-item expanded "><a href="../7-execsnoop/index.html"><strong aria-hidden="true">8.</strong> 捕获进程执行/退出时间，通过 perf event array 向用户态打印输出</a></li><li class="chapter-item expanded "><a href="../8-exitsnoop/index.html"><strong aria-hidden="true">9.</strong> 使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出</a></li><li class="chapter-item expanded "><a href="../9-runqlat/index.html"><strong aria-hidden="true">10.</strong> 一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度</a></li><li class="chapter-item expanded "><a href="../10-hardirqs/index.html"><strong aria-hidden="true">11.</strong> 使用 hardirqs 或 softirqs 捕获中断事件</a></li><li class="chapter-item expanded "><a href="../11-bootstrap/index.html"><strong aria-hidden="true">12.</strong> 使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用</a></li><li class="chapter-item expanded "><a href="../13-tcpconnlat/index.html"><strong aria-hidden="true">13.</strong> 使用 libbpf-bootstrap 开发程序统计 TCP 连接延时</a></li><li class="chapter-item expanded "><a href="../14-tcpstates/index.html"><strong aria-hidden="true">14.</strong> 使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT</a></li><li class="chapter-item expanded "><a href="../15-javagc/index.html"><strong aria-hidden="true">15.</strong> 使用 USDT 捕获用户态 Java GC 事件耗时</a></li><li class="chapter-item expanded "><a href="../16-memleak/index.html"><strong aria-hidden="true">16.</strong> 编写 eBPF 程序 Memleak 监控内存泄漏</a></li><li class="chapter-item expanded "><a href="../17-biopattern/index.html"><strong aria-hidden="true">17.</strong> 编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O</a></li><li class="chapter-item expanded "><a href="../18-further-reading/index.html"><strong aria-hidden="true">18.</strong> 更多的参考资料</a></li><li class="chapter-item expanded "><a href="../19-lsm-connect/index.html"><strong aria-hidden="true">19.</strong> 使用 LSM 进行安全检测防御</a></li><li class="chapter-item expanded "><a href="../20-tc/index.html"><strong aria-hidden="true">20.</strong> 使用 eBPF 进行 tc 流量控制</a></li><li class="chapter-item expanded affix "><li class="part-title">eBPF 高级特性与进阶主题</li><li class="chapter-item expanded "><a href="../22-android/index.html"><strong aria-hidden="true">21.</strong> 在 Android 上使用 eBPF 程序</a></li><li class="chapter-item expanded "><a href="../23-http/index.html"><strong aria-hidden="true">22.</strong> 使用 eBPF 追踪 HTTP 请求或其他七层协议</a></li><li class="chapter-item expanded "><a href="../30-sslsniff/index.html"><strong aria-hidden="true">23.</strong> 使用 uprobe 捕获多种库的 SSL/TLS 明文数据</a></li><li class="chapter-item expanded "><a href="../29-sockops/index.html"><strong aria-hidden="true">24.</strong> 使用 sockops 加速网络请求转发</a></li><li class="chapter-item expanded "><a href="../24-hide/index.html"><strong aria-hidden="true">25.</strong> 使用 eBPF 隐藏进程或文件信息</a></li><li class="chapter-item expanded "><a href="../25-signal/index.html"><strong aria-hidden="true">26.</strong> 使用 bpf_send_signal 发送信号终止进程</a></li><li class="chapter-item expanded "><a href="../26-sudo/index.html"><strong aria-hidden="true">27.</strong> 使用 eBPF 添加 sudo 用户</a></li><li class="chapter-item expanded "><a href="../27-replace/index.html"><strong aria-hidden="true">28.</strong> 使用 eBPF 替换任意程序读取或写入的文本</a></li><li class="chapter-item expanded "><a href="../28-detach/index.html"><strong aria-hidden="true">29.</strong> BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序</a></li><li class="chapter-item expanded "><a href="../30-sslsniff/index.html"><strong aria-hidden="true">30.</strong> 使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据</a></li><li class="chapter-item expanded affix "><li class="part-title">bcc 教程与文档</li><li class="chapter-item expanded "><a href="../bcc-documents/kernel-versions.html"><strong aria-hidden="true">31.</strong> BPF Features by Linux Kernel Version</a></li><li class="chapter-item expanded "><a href="../bcc-documents/kernel_config.html"><strong aria-hidden="true">32.</strong> Kernel Configuration for BPF Features</a></li><li class="chapter-item expanded "><a href="../bcc-documents/reference_guide.html"><strong aria-hidden="true">33.</strong> bcc Reference Guide</a></li><li class="chapter-item expanded "><a href="../bcc-documents/special_filtering.html"><strong aria-hidden="true">34.</strong> Special Filtering</a></li><li class="chapter-item expanded "><a href="../bcc-documents/tutorial.html"><strong aria-hidden="true">35.</strong> bcc Tutorial</a></li><li class="chapter-item expanded "><a href="../bcc-documents/tutorial_bcc_python_developer.html"><strong aria-hidden="true">36.</strong> bcc Python Developer Tutorial</a></li></ol>
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<h1 id="ebpf-入门开发实践教程六捕获进程发送信号的系统调用集合使用-hash-map-保存状态"><a class="header" href="#ebpf-入门开发实践教程六捕获进程发送信号的系统调用集合使用-hash-map-保存状态">eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态</a></h1>
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<p>eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。</p>
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<p>本文是 eBPF 入门开发实践教程的第六篇，主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。</p>
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<h2 id="sigsnoop"><a class="header" href="#sigsnoop">sigsnoop</a></h2>
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<p>示例代码如下：</p>
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<pre><code class="language-c">#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#define MAX_ENTRIES 10240
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#define TASK_COMM_LEN 16
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struct event {
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unsigned int pid;
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unsigned int tpid;
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int sig;
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int ret;
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char comm[TASK_COMM_LEN];
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};
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(max_entries, MAX_ENTRIES);
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__type(key, __u32);
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__type(value, struct event);
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} values SEC(".maps");
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static int probe_entry(pid_t tpid, int sig)
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{
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struct event event = {};
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__u64 pid_tgid;
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__u32 tid;
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pid_tgid = bpf_get_current_pid_tgid();
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tid = (__u32)pid_tgid;
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event.pid = pid_tgid >> 32;
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event.tpid = tpid;
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event.sig = sig;
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bpf_get_current_comm(event.comm, sizeof(event.comm));
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bpf_map_update_elem(&values, &tid, &event, BPF_ANY);
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return 0;
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}
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static int probe_exit(void *ctx, int ret)
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{
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__u64 pid_tgid = bpf_get_current_pid_tgid();
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__u32 tid = (__u32)pid_tgid;
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struct event *eventp;
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eventp = bpf_map_lookup_elem(&values, &tid);
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if (!eventp)
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return 0;
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eventp->ret = ret;
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bpf_printk("PID %d (%s) sent signal %d ",
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eventp->pid, eventp->comm, eventp->sig);
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bpf_printk("to PID %d, ret = %d",
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eventp->tpid, ret);
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cleanup:
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bpf_map_delete_elem(&values, &tid);
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return 0;
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}
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SEC("tracepoint/syscalls/sys_enter_kill")
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int kill_entry(struct trace_event_raw_sys_enter *ctx)
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{
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pid_t tpid = (pid_t)ctx->args[0];
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int sig = (int)ctx->args[1];
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return probe_entry(tpid, sig);
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}
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SEC("tracepoint/syscalls/sys_exit_kill")
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int kill_exit(struct trace_event_raw_sys_exit *ctx)
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{
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return probe_exit(ctx, ctx->ret);
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}
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char LICENSE[] SEC("license") = "Dual BSD/GPL";
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</code></pre>
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<p>上面的代码定义了一个 eBPF 程序，用于捕获进程发送信号的系统调用，包括 kill、tkill 和 tgkill。它通过使用 tracepoint 来捕获系统调用的进入和退出事件，并在这些事件发生时执行指定的探针函数，例如 probe_entry 和 probe_exit。</p>
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<p>在探针函数中，我们使用 bpf_map 存储捕获的事件信息，包括发送信号的进程 ID、接收信号的进程 ID、信号值和进程的可执行文件名称。在系统调用退出时，我们将获取存储在 bpf_map 中的事件信息，并使用 bpf_printk 打印进程 ID、进程名称、发送的信号和系统调用的返回值。</p>
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<p>最后，我们还需要使用 SEC 宏来定义探针，并指定要捕获的系统调用的名称，以及要执行的探针函数。</p>
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<p>eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 <a href="https://github.com/eunomia-bpf/eunomia-bpf">https://github.com/eunomia-bpf/eunomia-bpf</a> 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。</p>
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<p>编译运行上述代码：</p>
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<pre><code class="language-shell">docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest
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</code></pre>
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<p>或者</p>
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<pre><code class="language-console">$ ecc sigsnoop.bpf.c
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Compiling bpf object...
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Generating export types...
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Packing ebpf object and config into package.json...
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$ sudo ecli run package.json
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Runing eBPF program...
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</code></pre>
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<p>运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出：</p>
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<pre><code class="language-console">$ sudo cat /sys/kernel/debug/tracing/trace_pipe
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systemd-journal-363 [000] d...1 672.563868: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0
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systemd-journal-363 [000] d...1 672.563869: bpf_trace_printk: to PID 1400, ret = 0
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systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0
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systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: to PID 1527, ret = -3
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</code></pre>
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<h2 id="总结"><a class="header" href="#总结">总结</a></h2>
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<p>本文主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。使用 hash map 需要定义一个结构体：</p>
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<pre><code class="language-c">struct {
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__uint(type, BPF_MAP_TYPE_HASH);
|
||
__uint(max_entries, MAX_ENTRIES);
|
||
__type(key, __u32);
|
||
__type(value, struct event);
|
||
} values SEC(".maps");
|
||
</code></pre>
|
||
<p>并使用一些对应的 API 进行访问，例如 bpf_map_lookup_elem、bpf_map_update_elem、bpf_map_delete_elem 等。</p>
|
||
<p>更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档：<a href="https://github.com/eunomia-bpf/eunomia-bpf">https://github.com/eunomia-bpf/eunomia-bpf</a></p>
|
||
<p>如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 <a href="https://github.com/eunomia-bpf/bpf-developer-tutorial">https://github.com/eunomia-bpf/bpf-developer-tutorial</a> 或网站 <a href="https://eunomia.dev/zh/tutorials/">https://eunomia.dev/zh/tutorials/</a> 以获取更多示例和完整的教程。</p>
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