2 * copyright (c) 2001-2009 Emil Mikulic.
4 * darkstat.c: signals, cmdline parsing, program body.
6 * You may use, modify and redistribute this file under the terms of the
7 * GNU General Public License version 2. (see COPYING.GPL)
24 #include <arpa/inet.h>
38 # define INADDR_NONE (-1) /* Solaris */
41 /* --- Signal handling --- */
42 static volatile int running
= 1;
43 static void sig_shutdown(int signum _unused_
) { running
= 0; }
45 static volatile int reset_pending
= 0;
46 static void sig_reset(int signum _unused_
) { reset_pending
= 1; }
48 /* --- Commandline parsing --- */
50 parsenum(const char *str
, unsigned long max
/* 0 for no max */)
56 n
= strtoul(str
, &end
, 10);
58 errx(1, "\"%s\" is not a valid number", str
);
60 errx(1, "\"%s\" is out of range", str
);
61 if ((max
!= 0) && (n
> max
))
62 errx(1, "\"%s\" is out of range (max %lu)", str
, max
);
66 const char *interface
= NULL
;
67 static void cb_interface(const char *arg
) { interface
= arg
; }
69 const char *capfile
= NULL
;
70 static void cb_capfile(const char *arg
) { capfile
= arg
; }
73 static void cb_pppoe(const char *arg _unused_
) { want_pppoe
= 1; }
75 static void cb_verbose(const char *arg _unused_
) { want_verbose
= 1; }
77 int want_daemonize
= 1;
78 static void cb_no_daemon(const char *arg _unused_
) { want_daemonize
= 0; }
81 static void cb_no_promisc(const char *arg _unused_
) { want_promisc
= 0; }
84 static void cb_no_dns(const char *arg _unused_
) { want_dns
= 0; }
87 static void cb_no_macs(const char *arg _unused_
) { want_macs
= 0; }
89 int want_lastseen
= 1;
90 static void cb_no_lastseen(const char *arg _unused_
) { want_lastseen
= 0; }
92 unsigned short bindport
= 667;
93 static void cb_port(const char *arg
) { bindport
= parsenum(arg
, 65536); }
95 in_addr_t bindaddr
= INADDR_ANY
;
96 static void cb_bindaddr(const char *arg
)
98 bindaddr
= inet_addr(arg
);
99 if (bindaddr
== (in_addr_t
)INADDR_NONE
)
100 errx(1, "malformed address \"%s\"", arg
);
103 const char *filter
= NULL
;
104 static void cb_filter(const char *arg
) { filter
= arg
; }
106 static void cb_local(const char *arg
) { acct_init_localnet(arg
); }
108 const char *chroot_dir
= NULL
;
109 static void cb_chroot(const char *arg
) { chroot_dir
= arg
; }
111 const char *privdrop_user
= NULL
;
112 static void cb_user(const char *arg
) { privdrop_user
= arg
; }
114 const char *daylog_fn
= NULL
;
115 static void cb_daylog(const char *arg
)
117 if (chroot_dir
== NULL
)
118 errx(1, "the daylog file is relative to the chroot.\n"
119 "You must specify a --chroot dir before you can use --daylog.");
124 const char *import_fn
= NULL
;
125 static void cb_import(const char *arg
)
127 if (chroot_dir
== NULL
)
128 errx(1, "the import file is relative to the chroot.\n"
129 "You must specify a --chroot dir before you can use --import.");
134 const char *export_fn
= NULL
;
135 static void cb_export(const char *arg
)
137 if ((chroot_dir
== NULL
) && (capfile
== NULL
))
138 errx(1, "the export file is relative to the chroot.\n"
139 "You must specify a --chroot dir before you can use --export.");
144 static const char *pid_fn
= NULL
;
145 static void cb_pidfile(const char *arg
)
147 if (chroot_dir
== NULL
)
148 errx(1, "the pidfile is relative to the chroot.\n"
149 "You must specify a --chroot dir before you can use --pidfile.");
154 unsigned int hosts_max
= 1000;
155 static void cb_hosts_max(const char *arg
)
156 { hosts_max
= parsenum(arg
, 0); }
158 unsigned int hosts_keep
= 500;
159 static void cb_hosts_keep(const char *arg
)
160 { hosts_keep
= parsenum(arg
, 0); }
162 unsigned int ports_max
= 200;
163 static void cb_ports_max(const char *arg
)
164 { ports_max
= parsenum(arg
, 65536); }
166 unsigned int ports_keep
= 30;
167 static void cb_ports_keep(const char *arg
)
168 { ports_keep
= parsenum(arg
, 65536); }
170 unsigned int highest_port
= 65535;
171 static void cb_highest_port(const char *arg
)
172 { highest_port
= parsenum(arg
, 65535); }
174 int want_hexdump
= 0;
175 static void cb_hexdump(const char *arg _unused_
) { want_hexdump
= 1; }
180 const char *name
, *arg_name
; /* NULL arg_name means unary */
181 void (*callback
)(const char *arg
);
185 static struct cmdline_arg cmdline_args
[] = {
186 {"-i", "interface", cb_interface
, 0},
187 {"-r", "file", cb_capfile
, 0},
188 {"--pppoe", NULL
, cb_pppoe
, 0},
189 {"--verbose", NULL
, cb_verbose
, 0},
190 {"--no-daemon", NULL
, cb_no_daemon
, 0},
191 {"--no-promisc", NULL
, cb_no_promisc
, 0},
192 {"--no-dns", NULL
, cb_no_dns
, 0},
193 {"--no-macs", NULL
, cb_no_macs
, 0},
194 {"--no-lastseen", NULL
, cb_no_lastseen
, 0},
195 {"-p", "port", cb_port
, 0},
196 {"-b", "bindaddr", cb_bindaddr
, 0},
197 {"-f", "filter", cb_filter
, 0},
198 {"-l", "network/netmask", cb_local
, 0},
199 {"--chroot", "dir", cb_chroot
, 0},
200 {"--user", "username", cb_user
, 0},
201 {"--daylog", "filename", cb_daylog
, 0},
202 {"--import", "filename", cb_import
, 0},
203 {"--export", "filename", cb_export
, 0},
204 {"--pidfile", "filename", cb_pidfile
, 0},
205 {"--hosts-max", "count", cb_hosts_max
, 0},
206 {"--hosts-keep", "count", cb_hosts_keep
, 0},
207 {"--ports-max", "count", cb_ports_max
, 0},
208 {"--ports-keep", "count", cb_ports_keep
, 0},
209 {"--highest-port", "port", cb_highest_port
, 0},
210 {"--hexdump", NULL
, cb_hexdump
, 0},
211 {NULL
, NULL
, NULL
, 0}
218 for (i
=0; i
<width
; i
++) printf(" ");
222 * We autogenerate the usage statement from the cmdline_args data structure.
228 struct cmdline_arg
*arg
;
230 printf(PACKAGE_STRING
" (built with libpcap %d.%d)\n\n",
231 PCAP_VERSION_MAJOR
, PCAP_VERSION_MINOR
);
233 width
= printf("usage: darkstat ");
236 for (arg
= cmdline_args
; arg
->name
!= NULL
; arg
++) {
237 if (first
) first
= 0; else pad(width
);
238 printf("[ %s", arg
->name
);
239 if (arg
->arg_name
!= NULL
) printf(" %s", arg
->arg_name
);
243 "Please refer to the darkstat(8) manual page for further\n"
244 "documentation and usage examples.\n");
248 parse_sub_cmdline(const int argc
, char * const *argv
)
250 struct cmdline_arg
*arg
;
252 if (argc
== 0) return;
253 for (arg
= cmdline_args
; arg
->name
!= NULL
; arg
++)
254 if (strcmp(argv
[0], arg
->name
) == 0) {
255 if ((arg
->arg_name
!= NULL
) && (argc
== 1)) {
256 printf("\nerror: argument \"%s\" requires parameter \"%s\"\n",
257 arg
->name
, arg
->arg_name
);
261 if (arg
->num_seen
> 0) {
262 printf("\nerror: already specified argument \"%s\"\n",
269 if (arg
->arg_name
== NULL
) {
271 parse_sub_cmdline(argc
-1, argv
+1);
273 arg
->callback(argv
[1]);
274 parse_sub_cmdline(argc
-2, argv
+2);
279 printf("\nerror: illegal argument: \"%s\"\n", argv
[0]);
285 parse_cmdline(const int argc
, char * const *argv
)
288 /* Not enough args. */
293 parse_sub_cmdline(argc
, argv
);
295 /* some default values */
296 if (chroot_dir
== NULL
) chroot_dir
= CHROOT_DIR
;
297 if (privdrop_user
== NULL
) privdrop_user
= PRIVDROP_USER
;
299 /* sanity check args */
300 if ((interface
== NULL
) && (capfile
== NULL
))
301 errx(1, "must specify either interface (-i) or capture file (-r)");
303 if ((interface
!= NULL
) && (capfile
!= NULL
))
304 errx(1, "can't specify both interface (-i) and capture file (-r)");
306 if ((hosts_max
!= 0) && (hosts_keep
>= hosts_max
)) {
307 hosts_keep
= hosts_max
/ 2;
308 warnx("reducing --hosts-keep to %u, to be under --hosts-max (%u)",
309 hosts_keep
, hosts_max
);
311 verbosef("max %u hosts, cutting down to %u when exceeded",
312 hosts_max
, hosts_keep
);
314 if ((ports_max
!= 0) && (ports_keep
>= ports_max
)) {
315 ports_keep
= ports_max
/ 2;
316 warnx("reducing --ports-keep to %u, to be under --ports-max (%u)",
317 ports_keep
, ports_max
);
319 verbosef("max %u ports per host, cutting down to %u when exceeded",
320 ports_max
, ports_keep
);
322 if (want_hexdump
&& !want_verbose
) {
324 verbosef("--hexdump implies --verbose");
327 if (want_hexdump
&& want_daemonize
) {
329 verbosef("--hexdump implies --no-daemon");
334 run_from_capfile(void)
338 cap_from_file(capfile
, filter
);
340 if (export_fn
!= NULL
) db_export(export_fn
);
343 verbosef("Total packets: %qu, bytes: %qu", total_packets
, total_bytes
);
346 /* --- Program body --- */
348 main(int argc
, char **argv
)
351 parse_cmdline(argc
-1, argv
+1);
355 * This is very different from a regular run against a network
362 /* must verbosef() before first fork to init lock */
363 verbosef("starting up");
364 if (pid_fn
) pidfile_create(chroot_dir
, pid_fn
, privdrop_user
);
366 if (want_daemonize
) {
367 verbosef("daemonizing to run in the background!");
369 verbosef("I am the main process");
371 if (pid_fn
) pidfile_write_close();
373 /* do this first as it forks - minimize memory use */
374 if (want_dns
) dns_init(privdrop_user
);
375 cap_init(interface
, filter
, want_promisc
); /* needs root */
376 http_init(bindaddr
, bindport
, /*maxconn=*/ -1); /* low ports need root */
377 ncache_init(); /* must do before chroot() */
379 privdrop(chroot_dir
, privdrop_user
);
381 /* Don't need root privs for these: */
383 if (daylog_fn
!= NULL
) daylog_init(daylog_fn
);
386 if (import_fn
!= NULL
) db_import(import_fn
);
387 localip_init(interface
);
389 if (signal(SIGTERM
, sig_shutdown
) == SIG_ERR
)
390 errx(1, "signal(SIGTERM) failed");
391 if (signal(SIGINT
, sig_shutdown
) == SIG_ERR
)
392 errx(1, "signal(SIGINT) failed");
393 if (signal(SIGUSR1
, sig_reset
) == SIG_ERR
)
394 errx(1, "signal(SIGUSR1) failed");
396 verbosef("entering main loop");
400 int select_ret
, max_fd
= -1, use_timeout
= 0;
401 struct timeval timeout
;
407 if (export_fn
!= NULL
) db_export(export_fn
); /* FIXME: USR2? */
416 cap_fd_set(&rs
, &max_fd
, &timeout
, &use_timeout
);
417 http_fd_set(&rs
, &ws
, &max_fd
, &timeout
, &use_timeout
);
419 select_ret
= select(max_fd
+1, &rs
, &ws
, NULL
,
420 (use_timeout
) ? &timeout
: NULL
);
422 if ((select_ret
== 0) && (!use_timeout
))
423 errx(1, "select() erroneously timed out");
425 if (select_ret
== -1) {
439 verbosef("shutting down");
440 verbosef("pcap stats: %u packets received, %u packets dropped",
441 pkts_recv
, pkts_drop
);
444 if (export_fn
!= NULL
) db_export(export_fn
);
447 if (daylog_fn
!= NULL
) daylog_free();
449 if (pid_fn
) pidfile_unlink();
450 verbosef("shut down");
451 return (EXIT_SUCCESS
);
454 /* vim:set ts=3 sw=3 tw=78 expandtab: */