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271 lines
7.8 KiB
271 lines
7.8 KiB
#!/usr/bin/env python
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# @lint-avoid-python-3-compatibility-imports
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#
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# tcpconnect Trace TCP connect()s.
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# For Linux, uses BCC, eBPF. Embedded C.
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#
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# USAGE: tcpconnect [-h] [-t] [-p PID] [-P PORT [PORT ...]]
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#
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# All connection attempts are traced, even if they ultimately fail.
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#
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# This uses dynamic tracing of kernel functions, and will need to be updated
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# to match kernel changes.
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#
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# Copyright (c) 2015 Brendan Gregg.
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# Licensed under the Apache License, Version 2.0 (the "License")
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#
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# 25-Sep-2015 Brendan Gregg Created this.
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# 14-Feb-2016 " " Switch to bpf_perf_output.
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# 09-Jan-2019 Takuma Kume Support filtering by UID
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from __future__ import print_function
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from bcc import BPF
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from bcc.utils import printb
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import argparse
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from socket import inet_ntop, ntohs, AF_INET, AF_INET6
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from struct import pack
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import ctypes as ct
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# arguments
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examples = """examples:
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./tcpconnect # trace all TCP connect()s
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./tcpconnect -t # include timestamps
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./tcpconnect -p 181 # only trace PID 181
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./tcpconnect -P 80 # only trace port 80
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./tcpconnect -P 80,81 # only trace port 80 and 81
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./tcpconnect -U # include UID
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./tcpconnect -u 1000 # only trace UID 1000
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"""
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parser = argparse.ArgumentParser(
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description="Trace TCP connects",
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formatter_class=argparse.RawDescriptionHelpFormatter,
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epilog=examples)
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parser.add_argument("-t", "--timestamp", action="store_true",
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help="include timestamp on output")
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parser.add_argument("-p", "--pid",
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help="trace this PID only")
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parser.add_argument("-P", "--port",
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help="comma-separated list of destination ports to trace.")
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parser.add_argument("-U", "--print-uid", action="store_true",
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help="include UID on output")
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parser.add_argument("-u", "--uid",
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help="trace this UID only")
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parser.add_argument("--ebpf", action="store_true",
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help=argparse.SUPPRESS)
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args = parser.parse_args()
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debug = 0
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# define BPF program
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bpf_text = """
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#include <uapi/linux/ptrace.h>
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#include <net/sock.h>
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#include <bcc/proto.h>
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BPF_HASH(currsock, u32, struct sock *);
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// separate data structs for ipv4 and ipv6
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struct ipv4_data_t {
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u64 ts_us;
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u32 pid;
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u32 uid;
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u32 saddr;
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u32 daddr;
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u64 ip;
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u16 dport;
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char task[TASK_COMM_LEN];
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};
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BPF_PERF_OUTPUT(ipv4_events);
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struct ipv6_data_t {
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u64 ts_us;
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u32 pid;
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u32 uid;
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unsigned __int128 saddr;
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unsigned __int128 daddr;
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u64 ip;
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u16 dport;
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char task[TASK_COMM_LEN];
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};
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BPF_PERF_OUTPUT(ipv6_events);
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int trace_connect_entry(struct pt_regs *ctx, struct sock *sk)
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{
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u32 pid = bpf_get_current_pid_tgid();
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FILTER_PID
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u32 uid = bpf_get_current_uid_gid();
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FILTER_UID
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// stash the sock ptr for lookup on return
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currsock.update(&pid, &sk);
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return 0;
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};
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static int trace_connect_return(struct pt_regs *ctx, short ipver)
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{
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int ret = PT_REGS_RC(ctx);
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u32 pid = bpf_get_current_pid_tgid();
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struct sock **skpp;
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skpp = currsock.lookup(&pid);
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if (skpp == 0) {
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return 0; // missed entry
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}
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if (ret != 0) {
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// failed to send SYNC packet, may not have populated
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// socket __sk_common.{skc_rcv_saddr, ...}
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currsock.delete(&pid);
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return 0;
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}
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// pull in details
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struct sock *skp = *skpp;
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u16 dport = skp->__sk_common.skc_dport;
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FILTER_PORT
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if (ipver == 4) {
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struct ipv4_data_t data4 = {.pid = pid, .ip = ipver};
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data4.uid = bpf_get_current_uid_gid();
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data4.ts_us = bpf_ktime_get_ns() / 1000;
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data4.saddr = skp->__sk_common.skc_rcv_saddr;
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data4.daddr = skp->__sk_common.skc_daddr;
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data4.dport = ntohs(dport);
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bpf_get_current_comm(&data4.task, sizeof(data4.task));
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ipv4_events.perf_submit(ctx, &data4, sizeof(data4));
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} else /* 6 */ {
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struct ipv6_data_t data6 = {.pid = pid, .ip = ipver};
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data6.uid = bpf_get_current_uid_gid();
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data6.ts_us = bpf_ktime_get_ns() / 1000;
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bpf_probe_read(&data6.saddr, sizeof(data6.saddr),
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skp->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32);
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bpf_probe_read(&data6.daddr, sizeof(data6.daddr),
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skp->__sk_common.skc_v6_daddr.in6_u.u6_addr32);
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data6.dport = ntohs(dport);
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bpf_get_current_comm(&data6.task, sizeof(data6.task));
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ipv6_events.perf_submit(ctx, &data6, sizeof(data6));
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}
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currsock.delete(&pid);
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return 0;
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}
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int trace_connect_v4_return(struct pt_regs *ctx)
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{
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return trace_connect_return(ctx, 4);
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}
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int trace_connect_v6_return(struct pt_regs *ctx)
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{
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return trace_connect_return(ctx, 6);
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}
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"""
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# code substitutions
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if args.pid:
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bpf_text = bpf_text.replace('FILTER_PID',
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'if (pid != %s) { return 0; }' % args.pid)
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if args.port:
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dports = [int(dport) for dport in args.port.split(',')]
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dports_if = ' && '.join(['dport != %d' % ntohs(dport) for dport in dports])
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bpf_text = bpf_text.replace('FILTER_PORT',
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'if (%s) { currsock.delete(&pid); return 0; }' % dports_if)
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if args.uid:
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bpf_text = bpf_text.replace('FILTER_UID',
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'if (uid != %s) { return 0; }' % args.uid)
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bpf_text = bpf_text.replace('FILTER_PID', '')
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bpf_text = bpf_text.replace('FILTER_PORT', '')
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bpf_text = bpf_text.replace('FILTER_UID', '')
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if debug or args.ebpf:
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print(bpf_text)
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if args.ebpf:
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exit()
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# event data
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TASK_COMM_LEN = 16 # linux/sched.h
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class Data_ipv4(ct.Structure):
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_fields_ = [
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("ts_us", ct.c_ulonglong),
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("pid", ct.c_uint),
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("uid", ct.c_uint),
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("saddr", ct.c_uint),
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("daddr", ct.c_uint),
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("ip", ct.c_ulonglong),
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("dport", ct.c_ushort),
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("task", ct.c_char * TASK_COMM_LEN)
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]
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class Data_ipv6(ct.Structure):
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_fields_ = [
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("ts_us", ct.c_ulonglong),
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("pid", ct.c_uint),
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("uid", ct.c_uint),
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("saddr", (ct.c_ulonglong * 2)),
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("daddr", (ct.c_ulonglong * 2)),
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("ip", ct.c_ulonglong),
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("dport", ct.c_ushort),
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("task", ct.c_char * TASK_COMM_LEN)
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]
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# process event
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def print_ipv4_event(cpu, data, size):
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event = ct.cast(data, ct.POINTER(Data_ipv4)).contents
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global start_ts
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if args.timestamp:
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if start_ts == 0:
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start_ts = event.ts_us
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print("%-9.3f" % ((float(event.ts_us) - start_ts) / 1000000), end="")
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if args.print_uid:
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print("%-6d" % event.uid, end="")
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printb(b"%-6d %-12.12s %-2d %-16s %-16s %-4d" % (event.pid,
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event.task, event.ip,
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inet_ntop(AF_INET, pack("I", event.saddr)).encode(),
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inet_ntop(AF_INET, pack("I", event.daddr)).encode(), event.dport))
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def print_ipv6_event(cpu, data, size):
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event = ct.cast(data, ct.POINTER(Data_ipv6)).contents
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global start_ts
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if args.timestamp:
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if start_ts == 0:
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start_ts = event.ts_us
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print("%-9.3f" % ((float(event.ts_us) - start_ts) / 1000000), end="")
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if args.print_uid:
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print("%-6d" % event.uid, end="")
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printb(b"%-6d %-12.12s %-2d %-16s %-16s %-4d" % (event.pid,
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event.task, event.ip,
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inet_ntop(AF_INET6, event.saddr).encode(), inet_ntop(AF_INET6, event.daddr).encode(),
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event.dport))
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# initialize BPF
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b = BPF(text=bpf_text)
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b.attach_kprobe(event="tcp_v4_connect", fn_name="trace_connect_entry")
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b.attach_kprobe(event="tcp_v6_connect", fn_name="trace_connect_entry")
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b.attach_kretprobe(event="tcp_v4_connect", fn_name="trace_connect_v4_return")
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b.attach_kretprobe(event="tcp_v6_connect", fn_name="trace_connect_v6_return")
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# header
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if args.timestamp:
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print("%-9s" % ("TIME(s)"), end="")
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if args.print_uid:
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print("%-6s" % ("UID"), end="")
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print("%-6s %-12s %-2s %-16s %-16s %-4s" % ("PID", "COMM", "IP", "SADDR",
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"DADDR", "DPORT"))
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start_ts = 0
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# read events
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b["ipv4_events"].open_perf_buffer(print_ipv4_event)
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b["ipv6_events"].open_perf_buffer(print_ipv6_event)
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while 1:
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try:
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b.perf_buffer_poll()
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except KeyboardInterrupt:
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exit()
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