| /* 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 <unistd.h> |
| |
| #include <bpf/libbpf.h> |
| #include <bpf/bpf.h> |
| #include "solisten.h" |
| #include "solisten.skel.h" |
| #include "btf_helpers.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) |
| { |
| LIBBPF_OPTS(bpf_object_open_opts, open_opts); |
| 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_print(libbpf_print_fn); |
| |
| err = ensure_core_btf(&open_opts); |
| if (err) { |
| fprintf(stderr, "failed to fetch necessary BTF for CO-RE: %s\n", strerror(-err)); |
| return 1; |
| } |
| |
| obj = solisten_bpf__open_opts(&open_opts); |
| if (!obj) { |
| warn("failed to open BPF object\n"); |
| return 1; |
| } |
| |
| obj->rodata->target_pid = target_pid; |
| |
| if (fentry_can_attach("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); |
| cleanup_core_btf(&open_opts); |
| |
| return err != 0; |
| } |