static int __test__bpf(int index)
{
int ret;
void *obj_buf;
size_t obj_buf_sz;
struct bpf_object *obj;
ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
bpf_testcase_table[index].prog_id,
true);
if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
pr_debug("Unable to get BPF object, %s\n",
bpf_testcase_table[index].msg_compile_fail);
if (index == 0)
return TEST_SKIP;
else
return TEST_FAIL;
}
obj = prepare_bpf(obj_buf, obj_buf_sz,
bpf_testcase_table[index].name);
if (!obj) {
ret = TEST_FAIL;
goto out;
}
ret = do_test(obj,
bpf_testcase_table[index].target_func,
bpf_testcase_table[index].expect_result);
out:
bpf__clear();
return ret;
}
int run() {
// Returns
// 0 - Success
// -1 - API mode looks down on ofline captures.
// -2 - api_max_con makes sense only with api_sock.
// -3 - Daemon mode and offline captures don't mix.
// -4 - Daemon mode requires log_file or api_sock.
// -5 - [!] Note: under cygwin, switch_user is largely useless
// -6 - [!] Consider specifying switch_user in daemon mode (see README)
int ret = 0;
if (read_file && api_sock) {
printf("\nFATAL: API mode looks down on ofline captures");
ret = -1;
}
if (!api_sock && api_max_conn != API_MAX_CONN) {
printf("\nFATAL: api_max_con makes sense only with api_sock.");
ret = -2;
}
if (daemon_mode) {
if (read_file) {
printf("\nFATAL: Daemon mode and offline captures don't mix.");
ret = -3;
}
if (!log_file && !api_sock) {
printf("\nFATAL: Daemon mode requires log_file or api_sock.");
ret = -4;
}
#ifdef __CYGWIN__
if (switch_user) {
printf("\n[!] Note: under cygwin, switch_user is largely useless");
ret = -5;
}
#else
if (!switch_user) {
printf("\n[!] Consider specifying switch_user in daemon mode (see README)");
ret = -6;
}
#endif /* ^__CYGWIN__ */
}
tzset();
setlocale(LC_TIME, "C");
close_spare_fds();
get_hash_seed();
http_init();
read_config(fp_file ? fp_file : (u8*)FP_FILE);
prepare_pcap();
prepare_bpf();
if (log_file) open_log();
if (api_sock) open_api();
if (daemon_mode) {
null_fd = open("/dev/null", O_RDONLY);
if (null_fd < 0) printf("\nFATAL: Cannot open '/dev/null'.");
}
if (switch_user) drop_privs();
if (daemon_mode) fork_off();
signal(SIGHUP, daemon_mode ? SIG_IGN : abort_handler);
signal(SIGINT, abort_handler);
signal(SIGTERM, abort_handler);
if (read_file) offline_event_loop();
else live_event_loop();
if (!daemon_mode)
printf("\nAll done. Processed %llu packets.\n", packet_cnt);
#ifdef DEBUG_BUILD
destroy_all_hosts();
TRK_report();
#endif /* DEBUG_BUILD */
return ret;
}
int main(int argc, char** argv) {
s32 r;
setlinebuf(stdout);
SAYF("--- p0f " VERSION " by Michal Zalewski <*****@*****.**> ---\n\n");
if (getuid() != geteuid())
FATAL("Please don't make me setuid. See README for more.\n");
while ((r = getopt(argc, argv, "+LS:df:i:m:o:pr:s:t:u:")) != -1) switch (r) {
case 'L':
list_interfaces();
exit(0);
case 'S':
#ifdef __CYGWIN__
FATAL("API mode not supported on Windows (see README).");
#else
if (api_max_conn != API_MAX_CONN)
FATAL("Multiple -S options not supported.");
api_max_conn = atol(optarg);
if (!api_max_conn || api_max_conn > 100)
FATAL("Outlandish value specified for -S.");
break;
#endif /* ^__CYGWIN__ */
case 'd':
if (daemon_mode)
FATAL("Double werewolf mode not supported yet.");
daemon_mode = 1;
break;
case 'f':
if (fp_file)
FATAL("Multiple -f options not supported.");
fp_file = (u8*)optarg;
break;
case 'i':
if (use_iface)
FATAL("Multiple -i options not supported (try '-i any').");
use_iface = (u8*)optarg;
break;
case 'm':
if (max_conn != MAX_CONN || max_hosts != MAX_HOSTS)
FATAL("Multiple -m options not supported.");
if (sscanf(optarg, "%u,%u", &max_conn, &max_hosts) != 2 ||
!max_conn || max_conn > 100000 ||
!max_hosts || max_hosts > 500000)
FATAL("Outlandish value specified for -m.");
break;
case 'o':
if (log_file)
FATAL("Multiple -o options not supported.");
log_file = (u8*)optarg;
break;
case 'p':
if (set_promisc)
FATAL("Even more promiscuous? People will call me slutty!");
set_promisc = 1;
break;
case 'r':
if (read_file)
FATAL("Multiple -r options not supported.");
read_file = (u8*)optarg;
break;
case 's':
#ifdef __CYGWIN__
FATAL("API mode not supported on Windows (see README).");
#else
if (api_sock)
FATAL("Multiple -s options not supported.");
api_sock = (u8*)optarg;
break;
#endif /* ^__CYGWIN__ */
case 't':
if (conn_max_age != CONN_MAX_AGE || host_idle_limit != HOST_IDLE_LIMIT)
FATAL("Multiple -t options not supported.");
if (sscanf(optarg, "%u,%u", &conn_max_age, &host_idle_limit) != 2 ||
!conn_max_age || conn_max_age > 1000000 ||
!host_idle_limit || host_idle_limit > 1000000)
FATAL("Outlandish value specified for -t.");
break;
case 'u':
if (switch_user)
FATAL("Split personality mode not supported.");
switch_user = (u8*)optarg;
break;
default: usage();
}
if (optind < argc) {
if (optind + 1 == argc) orig_rule = (u8*)argv[optind];
else FATAL("Filter rule must be a single parameter (use quotes).");
}
if (read_file && api_sock)
FATAL("API mode looks down on ofline captures.");
if (!api_sock && api_max_conn != API_MAX_CONN)
FATAL("Option -S makes sense only with -s.");
if (daemon_mode) {
if (read_file)
FATAL("Daemon mode and offline captures don't mix.");
if (!log_file && !api_sock)
FATAL("Daemon mode requires -o or -s.");
#ifdef __CYGWIN__
if (switch_user)
SAYF("[!] Note: under cygwin, -u is largely useless.\n");
#else
if (!switch_user)
SAYF("[!] Consider specifying -u in daemon mode (see README).\n");
#endif /* ^__CYGWIN__ */
}
tzset();
setlocale(LC_TIME, "C");
close_spare_fds();
get_hash_seed();
http_init();
read_config(fp_file ? fp_file : (u8*)FP_FILE);
prepare_pcap();
prepare_bpf();
if (log_file) open_log();
if (api_sock) open_api();
if (daemon_mode) {
null_fd = open("/dev/null", O_RDONLY);
if (null_fd < 0) PFATAL("Cannot open '/dev/null'.");
}
if (switch_user) drop_privs();
if (daemon_mode) fork_off();
signal(SIGHUP, daemon_mode ? SIG_IGN : abort_handler);
signal(SIGINT, abort_handler);
signal(SIGTERM, abort_handler);
if (read_file) offline_event_loop(); else live_event_loop();
if (!daemon_mode)
SAYF("\nAll done. Processed %llu packets.\n", packet_cnt);
#ifdef DEBUG_BUILD
destroy_all_hosts();
TRK_report();
#endif /* DEBUG_BUILD */
return 0;
}
static int __test__bpf(int idx)
{
int ret;
void *obj_buf;
size_t obj_buf_sz;
struct bpf_object *obj;
ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
bpf_testcase_table[idx].prog_id,
true, NULL);
if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
pr_debug("Unable to get BPF object, %s\n",
bpf_testcase_table[idx].msg_compile_fail);
if (idx == 0)
return TEST_SKIP;
else
return TEST_FAIL;
}
obj = prepare_bpf(obj_buf, obj_buf_sz,
bpf_testcase_table[idx].name);
if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
if (!obj)
pr_debug("Fail to load BPF object: %s\n",
bpf_testcase_table[idx].msg_load_fail);
else
pr_debug("Success unexpectedly: %s\n",
bpf_testcase_table[idx].msg_load_fail);
ret = TEST_FAIL;
goto out;
}
if (obj) {
ret = do_test(obj,
bpf_testcase_table[idx].target_func,
bpf_testcase_table[idx].expect_result);
if (ret != TEST_OK)
goto out;
if (bpf_testcase_table[idx].pin) {
int err;
if (!bpf_fs__mount()) {
pr_debug("BPF filesystem not mounted\n");
ret = TEST_FAIL;
goto out;
}
err = mkdir(PERF_TEST_BPF_PATH, 0777);
if (err && errno != EEXIST) {
pr_debug("Failed to make perf_test dir: %s\n",
strerror(errno));
ret = TEST_FAIL;
goto out;
}
if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
ret = TEST_FAIL;
if (rm_rf(PERF_TEST_BPF_PATH))
ret = TEST_FAIL;
}
}
out:
bpf__clear();
return ret;
}