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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <arpa/inet.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <sys/resource.h>
#include <bpf/libbpf.h>
#include <sys/socket.h>
#include <time.h>
#include "https_trace.h"
#include "https_trace.skel.h"
// 用于打印调试信息
static int libbpf_print_fn(enum libbpf_print_level level, const char *format,
va_list args)
{
#ifdef DEBUGBPF
return vfprintf(stderr, format, args);
#else
return 0;
#endif
}
static volatile bool exiting = false;
static void sig_handler(int signo)
{
exiting = true;
}
// 以可读格式打印字符数组
void print_chars(const char *array, size_t size)
{
size_t trimmed_size = size;
for (trimmed_size = size; trimmed_size > 0; trimmed_size--) {
if (array[trimmed_size - 1] != 0) {
break;
}
}
for (size_t i = 0; i < trimmed_size; i++) {
printf("%c", (unsigned char)array[i]);
}
printf("\n\n");
}
// 输出 HTTPS 请求和响应信息（注意：长度截断至MAX_BUF_LENGTH）
static void handle_event(void *ctx, int cpu, void *data, __u32 data_size)
{
const struct event_t *e = data;
if (e->len > 0) {
printf("====================================\n");
char buf[MAX_BUF_LENGTH + 1] = { 0 };
memcpy(buf, e->buf, e->len);
printf("%s\t%s\n\n", e->comm, e->rw ? "write" : "read");
print_chars(buf, sizeof(buf));
}
}
// 提升RLIMIT_MEMLOCK以允许BPF子系统执行任何需要的操作
static void bump_memlock_rlimit(void)
{
struct rlimit rlim_new = {
.rlim_cur = RLIM_INFINITY,
.rlim_max = RLIM_INFINITY,
};
if (setrlimit(RLIMIT_MEMLOCK, &rlim_new)) {
fprintf(stderr, "Failed to increase RLIMIT_MEMLOCK limit!\n");
exit(1);
}
}
// 查找库的路径
char *find_library_path(const char *libname)
{
char cmd[256];
static char path[256];
snprintf(cmd, sizeof(cmd), "ldconfig -p | grep %s", libname);
FILE *fp = popen(cmd, "r");
if (!fp) {
fprintf(stderr, "Failed to run command: %s\n", cmd);
return NULL;
}
// 格式: libssl3.so (libc6,x86-64) => /lib/x86_64-linux-gnu/libssl3.so
if (fgets(path, sizeof(path) - 1, fp) != NULL) {
char *p = strrchr(path, '>');
if (p && *(p + 1) == ' ') {
memmove(path, p + 2, strlen(p + 2) + 1);
char *end = strchr(path, '\n');
if (end) {
*end = '\0';
}
pclose(fp);
return path;
}
}
pclose(fp);
return NULL;
}
int main(int argc, char **argv)
{
struct https_trace_bpf *skel;
struct perf_buffer *pb = NULL;
int err = 0;
// 设置libbpf的错误和调试信息回调
libbpf_set_print(libbpf_print_fn);
// 注册信号处理程序
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
// 提升RLIMIT_MEMLOCK以允许BPF子系统执行任何需要的操作
bump_memlock_rlimit();
// 查找OpenSSL库的路径
char *libssl_path = find_library_path("libssl.so");
if (!libssl_path) {
fprintf(stderr, "Failed to find libssl.so\n");
return 1;
}
// 加载BPF程序
skel = https_trace_bpf__open_and_load();
if (!skel) {
fprintf(stderr, "Failed to open and load BPF skeleton\n");
return 1;
}
// 创建buffer并绑定事件处理回调
pb = perf_buffer__new(bpf_map__fd(skel->maps.events), 16,
handle_event, NULL, NULL, NULL);
if (!pb) {
fprintf(stderr, "Failed to create perf buffer\n");
goto cleanup;
}
// 挂载uprobe到OpenSSL库
printf("Attaching uprobe to %s\n", libssl_path);
// SSL_read
LIBBPF_OPTS(bpf_uprobe_opts, uprobe_ropts,.func_name = "SSL_read");
skel->links.probe_SSL_read_entry =
bpf_program__attach_uprobe_opts(skel->progs.probe_SSL_read_entry,
-1, libssl_path, 0, &uprobe_ropts);
LIBBPF_OPTS(bpf_uprobe_opts, uprobe_ropts_ret,.func_name =
"SSL_read",.retprobe = true);
skel->links.probe_SSL_read_exit =
bpf_program__attach_uprobe_opts(skel->progs.probe_SSL_read_exit, -1,
libssl_path, 0, &uprobe_ropts_ret);
// SSL_write
LIBBPF_OPTS(bpf_uprobe_opts, uprobe_wopts,.func_name = "SSL_write");
skel->links.probe_SSL_write_entry =
bpf_program__attach_uprobe_opts(skel->progs.probe_SSL_write_entry,
-1, libssl_path, 0, &uprobe_wopts);
LIBBPF_OPTS(bpf_uprobe_opts, uprobe_wopts_ret,.func_name =
"SSL_write",.retprobe = true);
skel->links.probe_SSL_write_exit =
bpf_program__attach_uprobe_opts(skel->progs.probe_SSL_write_exit,
-1, libssl_path, 0,
&uprobe_wopts_ret);
// 从Buffer中读取数据
printf("Tracing HTTPS traffic... Hit Ctrl-C to end.\n");
while (!exiting) {
err = perf_buffer__poll(pb, 100);
if (err == -EINTR) {
err = 0;
break;
}
if (err < 0) {
fprintf(stderr, "Error polling perf buffer: %d\n", err);
break;
}
}
cleanup:
// 释放资源
perf_buffer__free(pb);
https_trace_bpf__destroy(skel);
return -err;
}
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