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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
/*
* solisten Trace IPv4 and IPv6 listen syscalls
*
* Copyright (c) 2021 Hengqi Chen
*
* Based on solisten(8) from BCC by Jean-Tiare Le Bigot
* 31-May-2021 Hengqi Chen Created this.
*/
#include <argp.h>
#include <arpa/inet.h>
#include <errno.h>
#include <signal.h>
#include <sys/socket.h>
#include <time.h>
#include <bpf/libbpf.h>
#include <bpf/bpf.h>
#include "solisten.h"
#include "solisten.skel.h"
#include "trace_helpers.h"
#define PERF_BUFFER_PAGES 16
#define PERF_POLL_TIMEOUT_MS 100
#define warn(...) fprintf(stderr, __VA_ARGS__)
static volatile sig_atomic_t exiting = 0;
static pid_t target_pid = 0;
static bool emit_timestamp = false;
static bool verbose = false;
const char *argp_program_version = "solisten 0.1";
const char *argp_program_bug_address =
"https://github.com/iovisor/bcc/tree/master/libbpf-tools";
const char argp_program_doc[] =
"Trace IPv4 and IPv6 listen syscalls.\n"
"\n"
"USAGE: solisten [-h] [-t] [-p PID]\n"
"\n"
"EXAMPLES:\n"
" solisten # trace listen syscalls\n"
" solisten -t # output with timestamp\n"
" solisten -p 1216 # only trace PID 1216\n";
static const struct argp_option opts[] = {
{ "pid", 'p', "PID", 0, "Process ID to trace" },
{ "timestamp", 't', NULL, 0, "Include timestamp on output" },
{ "verbose", 'v', NULL, 0, "Verbose debug output" },
{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
{},
};
static error_t parse_arg(int key, char *arg, struct argp_state *state)
{
long pid;
switch (key) {
case 'p':
errno = 0;
pid = strtol(arg, NULL, 10);
if (errno || pid <= 0) {
warn("Invalid PID: %s\n", arg);
argp_usage(state);
}
target_pid = pid;
break;
case 't':
emit_timestamp = true;
break;
case 'v':
verbose = true;
break;
case 'h':
argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
{
if (level == LIBBPF_DEBUG && !verbose)
return 0;
return vfprintf(stderr, format, args);
}
static void sig_int(int signo)
{
exiting = 1;
}
static void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)
{
const struct event *e = data;
time_t t;
struct tm *tm;
char ts[32], proto[16], addr[48] = {};
__u16 family = e->proto >> 16;
__u16 type = (__u16)e->proto;
const char *prot;
if (emit_timestamp) {
time(&t);
tm = localtime(&t);
strftime(ts, sizeof(ts), "%H:%M:%S", tm);
printf("%8s ", ts);
}
if (type == SOCK_STREAM)
prot = "TCP";
else if (type == SOCK_DGRAM)
prot = "UDP";
else
prot = "UNK";
if (family == AF_INET)
snprintf(proto, sizeof(proto), "%sv4", prot);
else /* family == AF_INET6 */
snprintf(proto, sizeof(proto), "%sv6", prot);
inet_ntop(family, e->addr, addr, sizeof(addr));
printf("%-7d %-16s %-3d %-7d %-5s %-5d %-32s\n",
e->pid, e->task, e->ret, e->backlog, proto, e->port, addr);
}
static void handle_lost_events(void *ctx, int cpu, __u64 lost_cnt)
{
warn("lost %llu events on CPU #%d\n", lost_cnt, cpu);
}
int main(int argc, char **argv)
{
static const struct argp argp = {
.options = opts,
.parser = parse_arg,
.doc = argp_program_doc,
};
struct perf_buffer *pb = NULL;
struct solisten_bpf *obj;
int err;
err = argp_parse(&argp, argc, argv, 0, NULL, NULL);
if (err)
return err;
libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
libbpf_set_print(libbpf_print_fn);
obj = solisten_bpf__open();
if (!obj) {
warn("failed to open BPF object\n");
return 1;
}
obj->rodata->target_pid = target_pid;
if (fentry_exists("inet_listen", NULL)) {
bpf_program__set_autoload(obj->progs.inet_listen_entry, false);
bpf_program__set_autoload(obj->progs.inet_listen_exit, false);
} else {
bpf_program__set_autoload(obj->progs.inet_listen_fexit, false);
}
err = solisten_bpf__load(obj);
if (err) {
warn("failed to load BPF object: %d\n", err);
goto cleanup;
}
err = solisten_bpf__attach(obj);
if (err) {
warn("failed to attach BPF programs: %d\n", err);
goto cleanup;
}
pb = perf_buffer__new(bpf_map__fd(obj->maps.events), PERF_BUFFER_PAGES,
handle_event, handle_lost_events, NULL, NULL);
if (!pb) {
err = -errno;
warn("failed to open perf buffer: %d\n", err);
goto cleanup;
}
if (signal(SIGINT, sig_int) == SIG_ERR) {
warn("can't set signal handler: %s\n", strerror(errno));
err = 1;
goto cleanup;
}
if (emit_timestamp)
printf("%-8s ", "TIME(s)");
printf("%-7s %-16s %-3s %-7s %-5s %-5s %-32s\n",
"PID", "COMM", "RET", "BACKLOG", "PROTO", "PORT", "ADDR");
while (!exiting) {
err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS);
if (err < 0 && err != -EINTR) {
warn("error polling perf buffer: %s\n", strerror(-err));
goto cleanup;
}
/* reset err to return 0 if exiting */
err = 0;
}
cleanup:
perf_buffer__free(pb);
solisten_bpf__destroy(obj);
return err != 0;
}
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