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/*
* RecordMySQLQuery Record MySQL queries by probing the alloc_query() function
* in mysqld. For Linux, uses BCC, eBPF. Embedded C.
*
* Basic example of BCC and uprobes.
*
* Copyright (c) Facebook, Inc.
* Licensed under the Apache License, Version 2.0 (the "License")
*/
#include <unistd.h>
#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <string>
#include "BPF.h"
const std::string BPF_PROGRAM = R"(
#include <linux/ptrace.h>
struct query_probe_t {
uint64_t ts;
pid_t pid;
char query[100];
};
BPF_HASH(queries, struct query_probe_t, int);
int probe_mysql_query(struct pt_regs *ctx, void* thd, char* query, size_t len) {
if (query) {
struct query_probe_t key = {};
key.ts = bpf_ktime_get_ns();
key.pid = bpf_get_current_pid_tgid();
bpf_probe_read_user_str(&key.query, sizeof(key.query), query);
int one = 1;
queries.update(&key, &one);
}
return 0;
}
)";
const std::string ALLOC_QUERY_FUNC = "_Z11alloc_queryP3THDPKcj";
// Define the same struct to use in user space.
struct query_probe_t {
uint64_t ts;
pid_t pid;
char query[100];
};
int main(int argc, char** argv) {
if (argc < 2) {
std::cout << "USAGE: RecordMySQLQuery PATH_TO_MYSQLD [duration]"
<< std::endl;
exit(1);
}
std::string mysql_path(argv[1]);
std::cout << "Using mysqld path: " << mysql_path << std::endl;
ebpf::BPF bpf;
auto init_res = bpf.init(BPF_PROGRAM);
if (!init_res.ok()) {
std::cerr << init_res.msg() << std::endl;
return 1;
}
auto attach_res =
bpf.attach_uprobe(mysql_path, ALLOC_QUERY_FUNC, "probe_mysql_query");
if (!attach_res.ok()) {
std::cerr << attach_res.msg() << std::endl;
return 1;
}
int probe_time = 10;
if (argc >= 3)
probe_time = atoi(argv[2]);
std::cout << "Probing for " << probe_time << " seconds" << std::endl;
sleep(probe_time);
auto table_handle = bpf.get_hash_table<query_probe_t, int>("queries");
auto table = table_handle.get_table_offline();
std::sort(
table.begin(), table.end(),
[](std::pair<query_probe_t, int> a, std::pair<query_probe_t, int> b) {
return a.first.ts < b.first.ts;
});
std::cout << table.size() << " queries recorded:" << std::endl;
for (auto it : table) {
std::cout << "Time: " << it.first.ts << " PID: " << it.first.pid
<< " Query: " << it.first.query << std::endl;
}
auto detach_res = bpf.detach_uprobe(mysql_path, ALLOC_QUERY_FUNC);
if (!detach_res.ok()) {
std::cerr << detach_res.msg() << std::endl;
return 1;
}
return 0;
}
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