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1 /* darkstat 3
2 * copyright (c) 2001-2014 Emil Mikulic.
3 *
4 * darkstat.c: signals, cmdline parsing, program body.
5 *
6 * You may use, modify and redistribute this file under the terms of the
7 * GNU General Public License version 2. (see COPYING.GPL)
8 */
9
10 #include "acct.h"
11 #include "cap.h"
12 #include "cdefs.h"
13 #include "config.h"
14 #include "conv.h"
15 #include "daylog.h"
16 #include "db.h"
17 #include "dns.h"
18 #include "err.h"
19 #include "hosts_db.h"
20 #include "http.h"
21 #include "localip.h"
22 #include "ncache.h"
23 #include "now.h"
24 #include "pidfile.h"
25 #include "str.h"
26
27 #include <assert.h>
28 #include <errno.h>
29 #include <inttypes.h>
30 #include <signal.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <syslog.h>
35 #include <unistd.h>
36 #include <pcap.h>
37
38 #ifndef INADDR_NONE
39 # define INADDR_NONE (-1) /* Solaris */
40 #endif
41
42 /* --- Signal handling --- */
43 static volatile int running = 1;
44 static void sig_shutdown(int signum _unused_) { running = 0; }
45
46 static volatile int reset_pending = 0, export_pending = 0;
47 static void sig_reset(int signum _unused_) {
48 reset_pending = 1;
49 export_pending = 1;
50 }
51
52 static void sig_export(int signum _unused_) { export_pending = 1; }
53
54 /* --- Commandline parsing --- */
55 static unsigned long parsenum(const char *str,
56 unsigned long max /* 0 for no max */) {
57 unsigned long n;
58 char *end;
59
60 errno = 0;
61 n = strtoul(str, &end, 10);
62 if (*end != '\0')
63 errx(1, "\"%s\" is not a valid number", str);
64 if (errno == ERANGE)
65 errx(1, "\"%s\" is out of range", str);
66 if ((max != 0) && (n > max))
67 errx(1, "\"%s\" is out of range (max %lu)", str, max);
68 return n;
69 }
70
71 static int opt_iface_seen = 0;
72 static void cb_interface(const char *arg) {
73 cap_add_ifname(arg);
74 opt_iface_seen = 1;
75 }
76
77 static void cb_filter(const char *arg) { cap_add_filter(arg); }
78
79 static const char *opt_capfile = NULL;
80 static void cb_capfile(const char *arg) { opt_capfile = arg; }
81
82 int opt_want_snaplen = -1;
83 static void cb_snaplen(const char *arg)
84 { opt_want_snaplen = (int)parsenum(arg, 0); }
85
86 int opt_want_pppoe = 0;
87 static void cb_pppoe(const char *arg _unused_) { opt_want_pppoe = 1; }
88
89 int opt_want_syslog = 0;
90 static void cb_syslog(const char *arg _unused_) { opt_want_syslog = 1; }
91
92 int opt_want_verbose = 0;
93 static void cb_verbose(const char *arg _unused_) { opt_want_verbose = 1; }
94
95 static int opt_want_daemonize = 1;
96 static void cb_no_daemon(const char *arg _unused_) { opt_want_daemonize = 0; }
97
98 static int opt_want_promisc = 1;
99 static void cb_no_promisc(const char *arg _unused_) { opt_want_promisc = 0; }
100
101 static int opt_want_dns = 1;
102 static void cb_no_dns(const char *arg _unused_) { opt_want_dns = 0; }
103
104 int opt_want_macs = 1;
105 static void cb_no_macs(const char *arg _unused_) { opt_want_macs = 0; }
106
107 int opt_want_lastseen = 1;
108 static void cb_no_lastseen(const char *arg _unused_) { opt_want_lastseen = 0; }
109
110 static unsigned short opt_bindport = 667;
111 static void cb_port(const char *arg)
112 { opt_bindport = (unsigned short)parsenum(arg, 65536); }
113
114 static void cb_bindaddr(const char *arg) { http_add_bindaddr(arg); }
115
116 static int is_localnet_specified = 0;
117 static void cb_local(const char *arg)
118 {
119 acct_init_localnet(arg);
120 is_localnet_specified = 1;
121 }
122
123 int opt_want_local_only = 0;
124 static void cb_local_only(const char *arg _unused_)
125 { opt_want_local_only = 1; }
126
127 static const char *opt_chroot_dir = NULL;
128 static void cb_chroot(const char *arg) { opt_chroot_dir = arg; }
129
130 static const char *opt_base = NULL;
131 static void cb_base(const char *arg) { opt_base = arg; }
132
133 static const char *opt_privdrop_user = NULL;
134 static void cb_user(const char *arg) { opt_privdrop_user = arg; }
135
136 static const char *opt_daylog_fn = NULL;
137 static void cb_daylog(const char *arg) { opt_daylog_fn = arg; }
138
139 static const char *import_fn = NULL;
140 static void cb_import(const char *arg) { import_fn = arg; }
141
142 static const char *export_fn = NULL;
143 static void cb_export(const char *arg) { export_fn = arg; }
144
145 static const char *pid_fn = NULL;
146 static void cb_pidfile(const char *arg) { pid_fn = arg; }
147
148 unsigned int opt_hosts_max = 1000;
149 static void cb_hosts_max(const char *arg)
150 { opt_hosts_max = parsenum(arg, 0); }
151
152 unsigned int opt_hosts_keep = 500;
153 static void cb_hosts_keep(const char *arg)
154 { opt_hosts_keep = parsenum(arg, 0); }
155
156 unsigned int opt_ports_max = 60;
157 static void cb_ports_max(const char *arg)
158 { opt_ports_max = parsenum(arg, 65536); }
159
160 unsigned int opt_ports_keep = 30;
161 static void cb_ports_keep(const char *arg)
162 { opt_ports_keep = parsenum(arg, 65536); }
163
164 unsigned int opt_highest_port = 65535;
165 static void cb_highest_port(const char *arg)
166 { opt_highest_port = parsenum(arg, 65535); }
167
168 int opt_wait_secs = -1;
169 static void cb_wait_secs(const char *arg)
170 { opt_wait_secs = (int)parsenum(arg, 0); }
171
172 int opt_want_hexdump = 0;
173 static void cb_hexdump(const char *arg _unused_)
174 { opt_want_hexdump = 1; }
175
176 static int opt_want_help = 0;
177 static void cb_help(const char *arg _unused_)
178 { opt_want_help = 1; }
179 static void cb_version(const char *arg _unused_)
180 { opt_want_help = -1; }
181
182 /* --- */
183
184 struct cmdline_arg {
185 const char *name, *arg_name; /* NULL arg_name means unary */
186 void (*callback)(const char *arg);
187 int num_seen;
188 };
189
190 static struct cmdline_arg cmdline_args[] = {
191 {"-i", "interface", cb_interface, -1},
192 {"-f", "filter", cb_filter, -1},
193 {"-r", "capfile", cb_capfile, 0},
194 {"-p", "port", cb_port, 0},
195 {"-b", "bindaddr", cb_bindaddr, -1},
196 {"-l", "network/netmask", cb_local, 0},
197 {"--base", "path", cb_base, 0},
198 {"--local-only", NULL, cb_local_only, 0},
199 {"--snaplen", "bytes", cb_snaplen, 0},
200 {"--pppoe", NULL, cb_pppoe, 0},
201 {"--syslog", NULL, cb_syslog, 0},
202 {"--verbose", NULL, cb_verbose, 0},
203 {"--no-daemon", NULL, cb_no_daemon, 0},
204 {"--no-promisc", NULL, cb_no_promisc, 0},
205 {"--no-dns", NULL, cb_no_dns, 0},
206 {"--no-macs", NULL, cb_no_macs, 0},
207 {"--no-lastseen", NULL, cb_no_lastseen, 0},
208 {"--chroot", "dir", cb_chroot, 0},
209 {"--user", "username", cb_user, 0},
210 {"--daylog", "filename", cb_daylog, 0},
211 {"--import", "filename", cb_import, 0},
212 {"--export", "filename", cb_export, 0},
213 {"--pidfile", "filename", cb_pidfile, 0},
214 {"--hosts-max", "count", cb_hosts_max, 0},
215 {"--hosts-keep", "count", cb_hosts_keep, 0},
216 {"--ports-max", "count", cb_ports_max, 0},
217 {"--ports-keep", "count", cb_ports_keep, 0},
218 {"--highest-port", "port", cb_highest_port, 0},
219 {"--wait", "secs", cb_wait_secs, 0},
220 {"--hexdump", NULL, cb_hexdump, 0},
221 {"--version", NULL, cb_version, 0},
222 {"--help", NULL, cb_help, 0},
223 {NULL, NULL, NULL, 0}
224 };
225
226 /* We autogenerate the usage statement from the cmdline_args data structure. */
227 static void usage(void) {
228 static char intro[] = "usage: darkstat ";
229 char indent[sizeof(intro)];
230 struct cmdline_arg *arg;
231
232 printf(PACKAGE_STRING " (using %s)\n", pcap_lib_version());
233 if (opt_want_help == -1) return;
234
235 memset(indent, ' ', sizeof(indent));
236 indent[0] = indent[sizeof(indent) - 1] = 0;
237
238 printf("\n%s", intro);
239 for (arg = cmdline_args; arg->name != NULL; arg++) {
240 printf("%s[ %s%s%s ]\n",
241 indent,
242 arg->name,
243 arg->arg_name != NULL ? " " : "",
244 arg->arg_name != NULL ? arg->arg_name : "");
245 indent[0] = ' ';
246 }
247 printf("\n"
248 "Please refer to the darkstat(8) manual page for further\n"
249 "documentation and usage examples.\n");
250 }
251
252 static void parse_sub_cmdline(const int argc, char * const *argv) {
253 struct cmdline_arg *arg;
254
255 if (argc == 0) return;
256 for (arg = cmdline_args; arg->name != NULL; arg++)
257 if (strcmp(argv[0], arg->name) == 0) {
258 if ((arg->arg_name != NULL) && (argc == 1)) {
259 fprintf(stderr,
260 "error: argument \"%s\" requires parameter \"%s\"\n",
261 arg->name, arg->arg_name);
262 usage();
263 exit(EXIT_FAILURE);
264 }
265 if (arg->num_seen > 0) {
266 fprintf(stderr,
267 "error: already specified argument \"%s\"\n",
268 arg->name);
269 usage();
270 exit(EXIT_FAILURE);
271 }
272
273 if (arg->num_seen != -1) /* accept more than one */
274 arg->num_seen++;
275
276 if (arg->arg_name == NULL) {
277 arg->callback(NULL);
278 parse_sub_cmdline(argc-1, argv+1);
279 } else {
280 arg->callback(argv[1]);
281 parse_sub_cmdline(argc-2, argv+2);
282 }
283 return;
284 }
285
286 fprintf(stderr, "error: illegal argument: \"%s\"\n", argv[0]);
287 usage();
288 exit(EXIT_FAILURE);
289 }
290
291 static void parse_cmdline(const int argc, char * const *argv) {
292 if (argc < 1) {
293 /* Not enough args. */
294 usage();
295 exit(EXIT_FAILURE);
296 }
297
298 parse_sub_cmdline(argc, argv);
299
300 if (opt_want_help) {
301 usage();
302 exit(EXIT_SUCCESS);
303 }
304
305 /* start syslogging as early as possible */
306 if (opt_want_syslog)
307 openlog("darkstat", LOG_NDELAY | LOG_PID, LOG_DAEMON);
308
309 /* default value */
310 if (opt_privdrop_user == NULL)
311 opt_privdrop_user = PRIVDROP_USER;
312
313 /* sanity check args */
314 if (!opt_iface_seen && opt_capfile == NULL)
315 errx(1, "must specify either interface (-i) or capture file (-r)");
316
317 if (opt_iface_seen && opt_capfile != NULL)
318 errx(1, "can't specify both interface (-i) and capture file (-r)");
319
320 if ((opt_hosts_max != 0) && (opt_hosts_keep >= opt_hosts_max)) {
321 opt_hosts_keep = opt_hosts_max / 2;
322 warnx("reducing --hosts-keep to %u, to be under --hosts-max (%u)",
323 opt_hosts_keep, opt_hosts_max);
324 }
325 verbosef("max %u hosts, cutting down to %u when exceeded",
326 opt_hosts_max, opt_hosts_keep);
327
328 if ((opt_ports_max != 0) && (opt_ports_keep >= opt_ports_max)) {
329 opt_ports_keep = opt_ports_max / 2;
330 warnx("reducing --ports-keep to %u, to be under --ports-max (%u)",
331 opt_ports_keep, opt_ports_max);
332 }
333 verbosef("max %u ports per host, cutting down to %u when exceeded",
334 opt_ports_max, opt_ports_keep);
335
336 if (opt_want_hexdump && !opt_want_verbose) {
337 opt_want_verbose = 1;
338 verbosef("--hexdump implies --verbose");
339 }
340
341 if (opt_want_hexdump && opt_want_daemonize) {
342 opt_want_daemonize = 0;
343 verbosef("--hexdump implies --no-daemon");
344 }
345
346 if (opt_want_local_only && !is_localnet_specified)
347 verbosef("WARNING: --local-only without -l only matches the local host");
348 }
349
350 static void run_from_capfile(void) {
351 now_init();
352 graph_init();
353 hosts_db_init();
354 cap_from_file(opt_capfile);
355 if (export_fn != NULL) db_export(export_fn);
356 hosts_db_free();
357 graph_free();
358 verbosef("Total packets: %llu, bytes: %llu",
359 (llu)acct_total_packets,
360 (llu)acct_total_bytes);
361 }
362
363 /* --- Program body --- */
364 int
365 main(int argc, char **argv)
366 {
367 test_64order();
368 parse_cmdline(argc-1, argv+1);
369
370 if (opt_capfile) {
371 run_from_capfile();
372 return 0;
373 }
374
375 /* must verbosef() before first fork to init lock */
376 verbosef("starting up");
377 if (pid_fn) pidfile_create(opt_chroot_dir, pid_fn, opt_privdrop_user);
378
379 if (opt_want_daemonize) {
380 verbosef("daemonizing to run in the background!");
381 daemonize_start();
382 verbosef("I am the main process");
383 }
384 if (pid_fn) pidfile_write_close();
385
386 /* do this first as it forks - minimize memory use */
387 if (opt_want_dns) dns_init(opt_privdrop_user);
388 cap_start(opt_want_promisc); /* needs root */
389 http_init_base(opt_base);
390 http_listen(opt_bindport);
391 ncache_init(); /* must do before chroot() */
392
393 privdrop(opt_chroot_dir, opt_privdrop_user);
394
395 /* Don't need root privs for these: */
396 now_init();
397 if (opt_daylog_fn != NULL) daylog_init(opt_daylog_fn);
398 graph_init();
399 hosts_db_init();
400 if (import_fn != NULL) db_import(import_fn);
401
402 if (signal(SIGTERM, sig_shutdown) == SIG_ERR)
403 errx(1, "signal(SIGTERM) failed");
404 if (signal(SIGINT, sig_shutdown) == SIG_ERR)
405 errx(1, "signal(SIGINT) failed");
406 if (signal(SIGUSR1, sig_reset) == SIG_ERR)
407 errx(1, "signal(SIGUSR1) failed");
408 if (signal(SIGUSR2, sig_export) == SIG_ERR)
409 errx(1, "signal(SIGUSR2) failed");
410
411 verbosef("entering main loop");
412 daemonize_finish();
413
414 while (running) {
415 int select_ret;
416 int max_fd = -1;
417 int use_timeout = 0;
418 int cap_ret;
419 struct timeval timeout;
420 struct timespec t;
421 fd_set rs, ws;
422
423 FD_ZERO(&rs);
424 FD_ZERO(&ws);
425 cap_fd_set(&rs, &max_fd, &timeout, &use_timeout);
426 http_fd_set(&rs, &ws, &max_fd, &timeout, &use_timeout);
427
428 select_ret = select(max_fd+1, &rs, &ws, NULL,
429 (use_timeout) ? &timeout : NULL);
430 if (select_ret == 0 && !use_timeout)
431 errx(1, "select() erroneously timed out");
432 if (select_ret == -1) {
433 if (errno == EINTR)
434 continue;
435 else
436 err(1, "select()");
437 }
438
439 timer_start(&t);
440 now_update();
441
442 if (export_pending) {
443 if (export_fn != NULL)
444 db_export(export_fn);
445 export_pending = 0;
446 }
447
448 if (reset_pending) {
449 if (export_pending)
450 continue; /* export before reset */
451 hosts_db_reset();
452 graph_reset();
453 reset_pending = 0;
454 }
455
456 graph_rotate();
457 cap_ret = cap_poll(&rs);
458 dns_poll();
459 http_poll(&rs, &ws);
460 timer_stop(&t, 1000000000, "event processing took longer than a second");
461
462 if (!cap_ret) {
463 running = 0;
464 }
465 }
466
467 verbosef("shutting down");
468 verbosef("pcap stats: %u packets received, %u packets dropped",
469 cap_pkts_recv, cap_pkts_drop);
470 http_stop();
471 cap_stop();
472 dns_stop();
473 if (export_fn != NULL) db_export(export_fn);
474 hosts_db_free();
475 graph_free();
476 if (opt_daylog_fn != NULL) daylog_free();
477 ncache_free();
478 if (pid_fn) pidfile_unlink();
479 verbosef("shut down");
480 return (EXIT_SUCCESS);
481 }
482
483 /* vim:set ts=3 sw=3 tw=78 expandtab: */