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159 lines
4.2 KiB
159 lines
4.2 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]
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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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# 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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from __future__ import print_function
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from bcc import BPF
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import argparse
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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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"""
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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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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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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
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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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u32 saddr = 0, daddr = 0;
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u16 dport = 0;
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dport = skp->__sk_common.skc_dport;
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if (ipver == 4) {
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saddr = skp->__sk_common.skc_rcv_saddr;
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daddr = skp->__sk_common.skc_daddr;
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// output
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bpf_trace_printk("4 %x %x %d\\n", saddr, daddr, ntohs(dport));
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} else /* 6 */ {
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// just grab the last 4 bytes for now
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bpf_probe_read(&saddr, sizeof(saddr),
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&skp->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32[3]);
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bpf_probe_read(&daddr, sizeof(daddr),
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&skp->__sk_common.skc_v6_daddr.in6_u.u6_addr32[3]);
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// output and flip byte order of addresses
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bpf_trace_printk("6 %x %x %d\\n", bpf_ntohl(saddr),
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bpf_ntohl(daddr), ntohs(dport));
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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',
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'if (pid != %s) { return 0; }' % args.pid)
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else:
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bpf_text = bpf_text.replace('FILTER', '')
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if debug:
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print(bpf_text)
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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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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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def inet_ntoa(addr):
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dq = ''
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for i in range(0, 4):
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dq = dq + str(addr & 0xff)
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if (i != 3):
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dq = dq + '.'
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addr = addr >> 8
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return dq
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# format output
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while 1:
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(task, pid, cpu, flags, ts, msg) = b.trace_fields()
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(ip_s, saddr_hs, daddr_hs, dport_s) = msg.split(" ")
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if args.timestamp:
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if start_ts == 0:
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start_ts = ts
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print("%-9.3f" % (ts - start_ts), end="")
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print("%-6d %-12.12s %-2s %-16s %-16s %-4s" % (pid, task, ip_s,
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inet_ntoa(int(saddr_hs, 16)) if ip_s == "4" else "..." + saddr_hs,
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inet_ntoa(int(daddr_hs, 16)) if ip_s == "4" else "..." + daddr_hs,
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dport_s))
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