eBPF BCC 实现UNIX socket抓包

在之前，我写了一个《eBPF bpftrace 实现个UNIX socket抓包试试》，但是很受限啊，不能完整打印包数据信息，今天又写了一个BCC的，感觉没问题了。

不多说，直接上代码：

#!/usr/bin/python
# @lint-avoid-python-3-compatibility-imports
#
# undump        Dump UNIX socket packets.
#               For Linux, uses BCC, eBPF. Embedded C.
# USAGE: undump [-h] [-t] [-p PID]
#
# This uses dynamic tracing of kernel functions, and will need to be updated
# to match kernel changes.
#
# Copyright (c) 2021 Rong Tao.
# Licensed under the GPL License, Version 2.0
#
# 27-Aug-2021   Rong Tao   Created this.
#
from __future__ import print_function
from bcc import BPF
from bcc.containers import filter_by_containers
from bcc.utils import printb
import argparse
from socket import inet_ntop, ntohs, AF_INET, AF_INET6
from struct import pack
from time import sleep
from datetime import datetime
import sys# arguments
examples = """examples:./undump           # trace/dump all UNIX packets./undump -t        # include timestamps./undump -p 181    # only trace/dump PID 181
"""
parser = argparse.ArgumentParser(description="Dump UNIX socket packets",formatter_class=argparse.RawDescriptionHelpFormatter,epilog=examples)parser.add_argument("-t", "--timestamp", action="store_true", help="include timestamp on output")
parser.add_argument("-p", "--pid",help="trace this PID only")
args = parser.parse_args()# define BPF program
bpf_text = """
#include <uapi/linux/ptrace.h>
#include <net/sock.h>
#include <bcc/proto.h>
#include <linux/aio.h>
#include <linux/socket.h>
#include <linux/net.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/module.h>
#include <net/sock.h>
#include <net/af_unix.h>// separate data structs for ipv4 and ipv6
struct stream_data_t {u64 ts_us;u32 pid;u32 uid;u32 sock_state;u32 sock_type;  //type of socket[STREAM|DRGMA]u64 sock_flags;char task[TASK_COMM_LEN];char *unix_sock_path;int msg_namelen;
};
BPF_PERF_OUTPUT(stream_recvmsg_events);#define MAX_PKT 512
struct recv_data_t {u32 recv_len;u8  pkt[MAX_PKT];
};// single element per-cpu array to hold the current event off the stack
BPF_PERCPU_ARRAY(unix_data, struct recv_data_t,1);BPF_PERF_OUTPUT(unix_recv_events);//static int unix_stream_recvmsg(struct socket *sock, struct msghdr *msg,
//                 size_t size, int flags)
int trace_stream_entry(struct pt_regs *ctx)
{int ret = PT_REGS_RC(ctx);u64 pid_tgid = bpf_get_current_pid_tgid();u32 pid = pid_tgid >> 32;u32 tid = pid_tgid;FILTER_PIDstruct stream_data_t data4 = {.pid = pid,};data4.uid = bpf_get_current_uid_gid();data4.ts_us = bpf_ktime_get_ns() / 1000;struct socket *sock = (struct socket *)PT_REGS_PARM1(ctx);   struct msghdr *msg = (struct msghdr *)PT_REGS_PARM2(ctx);    data4.sock_state = sock->state;data4.sock_type = sock->type;data4.sock_flags = sock->flags;data4.msg_namelen = msg->msg_namelen;bpf_get_current_comm(&data4.task, sizeof(data4.task));struct unix_sock *unsock = (struct unix_sock *)sock->sk;data4.unix_sock_path = (char *)unsock->path.dentry->d_name.name;stream_recvmsg_events.perf_submit(ctx, &data4, sizeof(data4));return 0;
};int trace_unix_stream_read_actor(struct pt_regs *ctx)
{u32 zero = 0;int ret = PT_REGS_RC(ctx);u64 pid_tgid = bpf_get_current_pid_tgid();u32 pid = pid_tgid >> 32;u32 tid = pid_tgid;FILTER_PIDstruct sk_buff *skb = (struct sk_buff *)PT_REGS_PARM1(ctx);struct recv_data_t *data = unix_data.lookup(&zero);if (!data) return 0;unsigned int data_len = skb->len;if(data_len > MAX_PKT)return 0;void *iodata = (void *)skb->data;data->recv_len = data_len;bpf_probe_read(data->pkt, data_len, iodata);unix_recv_events.perf_submit(ctx, data, data_len+sizeof(u32));return 0;
}"""if args.pid:bpf_text = bpf_text.replace('FILTER_PID','if (pid != %s) { return 0; }' % args.pid)bpf_text = bpf_text.replace('FILTER_PID', '')# process event
def print_stream_event(cpu, data, size):event = b["stream_recvmsg_events"].event(data)global start_tsif args.timestamp:if start_ts == 0:start_ts = event.ts_usprintb(b"%-9.3f" % ((float(event.ts_us) - start_ts) / 1000000), nl="")printb(b"%-6s %-12s" % (event.pid, event.task))# process event
def print_recv_pkg(cpu, data, size):event = b["unix_recv_events"].event(data)print("----------------", end="")for i in range(0, event.recv_len):print("%02x " % event.pkt[i], end="")sys.stdout.flush()if (i+1)%16 == 0:print("")print("----------------", end="")print("\n----------------recv %d bytes" % event.recv_len)# initialize BPF
b = BPF(text=bpf_text)
b.attach_kprobe(event="unix_stream_recvmsg", fn_name="trace_stream_entry")
b.attach_kprobe(event="unix_stream_read_actor", fn_name="trace_unix_stream_read_actor")print("Tracing UNIX socket packets ... Hit Ctrl-C to end")# header
if args.timestamp:print("%-9s" % ("TIME(s)"), end="")print("%-6s %-12s" % ("PID", "COMM"), end="")
print()print()
start_ts = 0# read events
b["stream_recvmsg_events"].open_perf_buffer(print_stream_event)
b["unix_recv_events"].open_perf_buffer(print_recv_pkg)while True:try:b.perf_buffer_poll()except KeyboardInterrupt:exit()

help信息

[root@localhost study]# ./undump.py -h
usage: undump.py [-h] [-t] [-p PID]Dump UNIX socket packetsoptional arguments:-h, --help         show this help message and exit-t, --timestamp    include timestamp on output-p PID, --pid PID  trace this PID onlyexamples:./undump           # trace/dump all UNIX packets./undump -t        # include timestamps./undump -p 181    # only trace/dump PID 181

效果：

abcdef前面的字段是我的消息头

struct MsgHdr {int src;int dst;int id;char data[];
}__attribute__((packed));

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