c4f2d992 |
1 | /* -*-c-*- |
2 | * |
f60a3434 |
3 | * $Id: daemon.c,v 1.12 2003/10/12 00:14:55 mdw Exp $ |
c4f2d992 |
4 | * |
5 | * Running a `become' daemon |
6 | * |
c758e654 |
7 | * (c) 1998 EBI |
c4f2d992 |
8 | */ |
9 | |
03f996bd |
10 | /*----- Licensing notice --------------------------------------------------* |
c4f2d992 |
11 | * |
12 | * This file is part of `become' |
13 | * |
14 | * `Become' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `Become' is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
03f996bd |
25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
c4f2d992 |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: daemon.c,v $ |
f60a3434 |
32 | * Revision 1.12 2003/10/12 00:14:55 mdw |
33 | * Major overhaul. Now uses DSA signatures rather than the bogus symmetric |
34 | * encrypt-and-hope thing. Integrated with mLib and Catacomb. |
35 | * |
79fae27d |
36 | * Revision 1.11 1999/05/04 16:17:12 mdw |
37 | * Change to header file name for parser. See log for `parse.h' for |
38 | * details. |
39 | * |
40 | * Revision 1.10 1998/04/23 13:23:09 mdw |
8702965d |
41 | * Support new interface to configuration file parser. |
42 | * |
c758e654 |
43 | * Revision 1.9 1998/01/12 16:45:59 mdw |
44 | * Fix copyright date. |
45 | * |
9e5602f0 |
46 | * Revision 1.8 1997/09/26 09:14:58 mdw |
47 | * Merged blowfish branch into trunk. |
48 | * |
49 | * Revision 1.7.2.1 1997/09/26 09:08:05 mdw |
50 | * Use the Blowfish encryption algorithm instead of IDEA. This is partly |
51 | * because I prefer Blowfish (without any particularly strong evidence) but |
52 | * mainly because IDEA is patented and Blowfish isn't. |
53 | * |
0c6c5a97 |
54 | * Revision 1.7 1997/09/17 10:23:23 mdw |
55 | * Fix a typo. Port numbers are in network order now, so don't change them. |
56 | * |
f3debbd8 |
57 | * Revision 1.6 1997/09/09 18:17:06 mdw |
58 | * Allow default port to be given as a service name or port number. |
59 | * |
60 | * Revision 1.5 1997/08/20 16:17:10 mdw |
ffdb9474 |
61 | * More sensible restart routine: `_reinit' functions replaced by `_end' and |
62 | * `_init' functions. |
63 | * |
a63eaefc |
64 | * Revision 1.4 1997/08/07 10:00:37 mdw |
65 | * (Log entry for previous version is bogus.) Read netgroups database. |
66 | * Give up privileges permanently on startup. |
607937a4 |
67 | * |
03f996bd |
68 | * Revision 1.2 1997/08/04 10:24:21 mdw |
69 | * Sources placed under CVS control. |
70 | * |
71 | * Revision 1.1 1997/07/21 13:47:50 mdw |
c4f2d992 |
72 | * Initial revision |
73 | * |
74 | */ |
75 | |
76 | /*----- Header files ------------------------------------------------------*/ |
77 | |
78 | /* --- ANSI headers --- */ |
79 | |
80 | #include <errno.h> |
81 | #include <signal.h> |
c4f2d992 |
82 | #include <stdio.h> |
83 | #include <stdlib.h> |
84 | #include <string.h> |
85 | |
86 | /* --- Unix headers --- */ |
87 | |
88 | #include <sys/types.h> |
89 | #include <sys/time.h> |
90 | #include <sys/socket.h> |
91 | |
92 | #include <netinet/in.h> |
93 | |
94 | #include <arpa/inet.h> |
95 | |
96 | #include <netdb.h> |
97 | #include <syslog.h> |
98 | #include <unistd.h> |
99 | |
f60a3434 |
100 | /* --- mLib headers --- */ |
101 | |
102 | #include <mLib/fwatch.h> |
103 | #include <mLib/quis.h> |
104 | #include <mLib/report.h> |
105 | #include <mLib/sel.h> |
106 | #include <mLib/sig.h> |
107 | #include <mLib/sym.h> |
108 | #include <mLib/trace.h> |
109 | |
110 | /* --- Catacomb headers --- */ |
111 | |
112 | #include <catacomb/buf.h> |
113 | #include <catacomb/dsa.h> |
114 | #include <catacomb/key.h> |
115 | #include <catacomb/mp.h> |
116 | #include <catacomb/noise.h> |
117 | #include <catacomb/paranoia.h> |
118 | #include <catacomb/rand.h> |
119 | #include <catacomb/sha.h> |
120 | |
c4f2d992 |
121 | /* --- Local headers --- */ |
122 | |
123 | #include "become.h" |
124 | #include "config.h" |
c4f2d992 |
125 | #include "daemon.h" |
c4f2d992 |
126 | #include "lexer.h" |
127 | #include "name.h" |
607937a4 |
128 | #include "netg.h" |
79fae27d |
129 | #include "parse.h" |
c4f2d992 |
130 | #include "rule.h" |
c4f2d992 |
131 | #include "userdb.h" |
c4f2d992 |
132 | |
133 | /*----- Arbitrary constants -----------------------------------------------*/ |
134 | |
f60a3434 |
135 | #define daemon__awakeEvery (5 * 60) /* Awaken this often to rescan */ |
c4f2d992 |
136 | |
137 | /*----- Static variables --------------------------------------------------*/ |
138 | |
c4f2d992 |
139 | static int daemon__port = -1; /* No particular port yet */ |
c4f2d992 |
140 | static int daemon__readKey = 0; /* Have I read a key? */ |
f60a3434 |
141 | static fwatch daemon__watch; |
142 | static sel_timer daemon__timer; /* Timer for reading */ |
143 | static sel_state daemon__sel; /* Select context */ |
144 | static sel_file daemon__listen; /* Listening socket selector */ |
145 | static const char *daemon__config; /* Configuration file for daemon */ |
146 | static dsa_priv daemon__key; /* The key data */ |
c4f2d992 |
147 | |
148 | /*----- Main code ---------------------------------------------------------*/ |
149 | |
150 | /* --- @daemon_usePort@ --- * |
151 | * |
152 | * Arguments: @int port@ = port to use, please |
153 | * |
154 | * Returns: --- |
155 | * |
156 | * Use: Instructs the daemon to listen to the given port. |
157 | */ |
158 | |
159 | void daemon_usePort(int port) |
160 | { |
161 | daemon__port = port; |
162 | } |
163 | |
f60a3434 |
164 | /* --- @daemon__moan@ --- * |
165 | * |
166 | * Arguments: @const char *f@ = offending file name |
167 | * @int line@ = offending line of the file |
168 | * @const char *msg@ = message |
169 | * @void *p@ = ignored |
170 | * |
171 | * Returns: --- |
172 | * |
173 | * Use: Reports an error message about a key file. |
174 | */ |
175 | |
176 | static void daemon__moan(const char *f, int line, const char *msg, void *p) |
177 | { |
178 | syslog(LOG_ERR, "key file error: %s: %d: %s", f, line, msg); |
179 | } |
180 | |
c4f2d992 |
181 | /* --- @daemon_readKey@ --- * |
182 | * |
f60a3434 |
183 | * Arguments: @const char *kf@ = pointer to key file name to use |
c4f2d992 |
184 | * |
185 | * Returns: --- |
186 | * |
f60a3434 |
187 | * Use: Loads the private key from the key file. |
c4f2d992 |
188 | */ |
189 | |
190 | void daemon_readKey(const char *kf) |
191 | { |
f60a3434 |
192 | key_packstruct kps[DSA_PRIVFETCHSZ]; |
193 | key_packdef *kp; |
194 | key_file f; |
195 | key *k; |
196 | int err; |
c4f2d992 |
197 | |
f60a3434 |
198 | if (daemon__readKey) |
c4f2d992 |
199 | return; |
f60a3434 |
200 | if (key_open(&f, kf, KOPEN_READ, daemon__moan, 0)) |
c4f2d992 |
201 | return; |
f60a3434 |
202 | kp = key_fetchinit(dsa_privfetch, kps, &daemon__key); |
203 | if ((k = key_bytype(&f, "become-dsa")) == 0) |
204 | err = KERR_NOTFOUND; |
205 | else |
206 | err = key_fetch(kp, k); |
207 | if (err) |
208 | syslog(LOG_ERR, "couldn't load key: %s", key_strerror(err)); |
209 | else { |
210 | mp_copy(daemon__key.dp.p); |
211 | mp_copy(daemon__key.dp.q); |
212 | mp_copy(daemon__key.dp.g); |
213 | mp_copy(daemon__key.x); |
214 | mp_copy(daemon__key.y); |
c4f2d992 |
215 | } |
f60a3434 |
216 | key_fetchdone(kp); |
217 | key_close(&f); |
c4f2d992 |
218 | } |
219 | |
220 | /* --- @daemon__readConfig@ --- * |
221 | * |
222 | * Arguments: @const char *cf@ = pointer to configuration file to use |
223 | * |
224 | * Returns: Zero if it worked, nonzero if it hurt... |
225 | * |
226 | * Use: Reads the configuration file, and other things. |
227 | */ |
228 | |
229 | static int daemon__readConfig(const char *cf) |
230 | { |
231 | FILE *fp; |
232 | |
233 | daemon__readKey = 0; |
234 | if ((fp = fopen(cf, "r")) == 0) |
235 | return (-1); |
236 | lexer_scan(fp); |
8702965d |
237 | parse(); |
c4f2d992 |
238 | fclose(fp); |
239 | if (!daemon__readKey) |
240 | daemon_readKey(file_KEY); |
03f996bd |
241 | T( trace(TRACE_DAEMON, "daemon: read config file"); ) |
c4f2d992 |
242 | return (0); |
243 | } |
244 | |
c4f2d992 |
245 | /* --- @daemon__read@ --- * |
246 | * |
247 | * Arguments: @int fd@ = socket handle |
f60a3434 |
248 | * @unsigned mode@ = ignored |
249 | * @void *p@ = ignored |
c4f2d992 |
250 | * |
251 | * Returns: --- |
252 | * |
253 | * Use: Examines a buffer, and returns a response. |
254 | */ |
255 | |
f60a3434 |
256 | void daemon__read(int fd, unsigned mode, void *p) |
c4f2d992 |
257 | { |
258 | unsigned char buff[65536]; /* Buffer for incoming packets */ |
c4f2d992 |
259 | struct sockaddr_in sin; /* Address of packet sender */ |
260 | char sender[64]; /* Sender's hostname (resolved) */ |
f60a3434 |
261 | octet h[SHA_HASHSZ]; /* Hash of the transmission buffer */ |
262 | sha_ctx hc; /* Hashing context */ |
c4f2d992 |
263 | request rq; /* Request buffer for verification */ |
f60a3434 |
264 | ssize_t sz; /* Length of incoming message */ |
265 | socklen_t slen; /* Length of incoming address */ |
266 | uint32 u; /* Scratch integer */ |
267 | uint16 ul; /* And another */ |
268 | struct hostent *he; /* Resolve structure */ |
269 | mp *m, *k, *r, *s; /* Integers for signing */ |
270 | int ans; /* Answer from the check */ |
271 | buf b; /* Buffer for parsing request */ |
c4f2d992 |
272 | |
f60a3434 |
273 | /* --- Kick some randomness in the pot --- */ |
c4f2d992 |
274 | |
f60a3434 |
275 | noise_timer(RAND_GLOBAL); |
c4f2d992 |
276 | |
f60a3434 |
277 | /* --- Read the message --- */ |
278 | |
279 | slen = sizeof(sin); |
280 | if ((sz = recvfrom(fd, (char *)buff, sizeof(buff), 0, |
281 | (struct sockaddr *)&sin, &slen)) < 0) { |
282 | T( trace(TRACE_DAEMON, "daemon: error reading packet: %s", |
283 | strerror(errno)); ) |
284 | syslog(LOG_INFO, "duff packet received: %e"); |
285 | return; |
c4f2d992 |
286 | } |
287 | |
288 | /* --- Resolve the host name --- */ |
289 | |
f60a3434 |
290 | he = gethostbyaddr((char *)&sin.sin_addr, sizeof(sin.sin_addr), AF_INET); |
291 | sender[0] = 0; |
292 | strncat(sender, he ? he->h_name : inet_ntoa(sin.sin_addr), |
293 | sizeof(sender) - 1); |
294 | syslog(LOG_DEBUG, "packet received from %s", sender); |
295 | T( trace(TRACE_DAEMON, "daemon: received request from %s", sender); ) |
c4f2d992 |
296 | |
297 | /* --- Unpack the block --- */ |
298 | |
c4f2d992 |
299 | rq.host = sin.sin_addr; |
f60a3434 |
300 | buf_init(&b, buff, sz); |
301 | if (buf_ensure(&b, SHA_HASHSZ)) goto fail; BSTEP(&b, SHA_HASHSZ); |
302 | if (buf_getu32(&b, &u)) goto fail; rq.from = u; |
303 | if (buf_getu32(&b, &u)) goto fail; rq.to = u; |
304 | if (buf_getu16(&b, &ul) || buf_ensure(&b, ul) || ul >= sizeof(rq.cmd)) |
305 | goto fail; |
306 | memcpy(rq.cmd, BCUR(&b), ul); |
307 | rq.cmd[ul] = 0; |
308 | BSTEP(&b, ul); |
309 | if (BLEFT(&b)) goto fail; |
310 | |
311 | /* --- Hash the request block --- */ |
312 | |
313 | sha_init(&hc); |
314 | sha_hash(&hc, buff, sz); |
315 | sha_done(&hc, h); |
c4f2d992 |
316 | |
317 | /* --- Build a reply block --- */ |
318 | |
f60a3434 |
319 | ans = rule_check(&rq); |
320 | syslog(LOG_INFO, "request from %s for %i to become %i to run %s %s", |
321 | sender, rq.from, rq.to, rq.cmd, ans ? "granted" : "denied"); |
322 | buf_init(&b, buff, sizeof(buff)); |
323 | if (buf_put(&b, h, sizeof(h)) || buf_putbyte(&b, ans)) |
324 | goto fail; |
325 | |
326 | /* --- Sign the reply block --- */ |
327 | |
328 | sha_init(&hc); |
329 | sha_hash(&hc, BBASE(&b), BLEN(&b)); |
330 | sha_done(&hc, h); |
331 | m = mp_loadb(MP_NEW, h, sizeof(h)); |
332 | rand_get(RAND_GLOBAL, h, sizeof(h)); |
333 | k = mp_loadb(MP_NEWSEC, h, sizeof(h)); |
334 | r = s = MP_NEW; |
335 | dsa_mksig(&daemon__key.dp, daemon__key.x, m, k, &r, &s); |
336 | buf_putmp(&b, r); |
337 | buf_putmp(&b, s); |
338 | mp_drop(m); |
339 | mp_drop(k); |
340 | mp_drop(r); |
341 | mp_drop(s); |
342 | if (BBAD(&b)) |
343 | goto fail; |
c4f2d992 |
344 | |
345 | /* --- Send the reply off --- */ |
346 | |
f60a3434 |
347 | sendto(fd, BBASE(&b), BLEN(&b), 0, (struct sockaddr *)&sin, sizeof(sin)); |
03f996bd |
348 | T( trace(TRACE_DAEMON, "daemon: reply sent"); ) |
f60a3434 |
349 | return; |
350 | |
351 | fail: |
352 | syslog(LOG_ERR, "couldn't respond to query"); |
353 | T( trace(TRACE_DAEMON, "daemon: failed to answer query"); ) |
354 | } |
355 | |
356 | /* --- @daemon__die@ --- * |
357 | * |
358 | * Arguments: @int n@ = signal number |
359 | * @void *p@ = ignored |
360 | * |
361 | * Returns: Doesn't. |
362 | * |
363 | * Use: Exits the daemon. |
364 | */ |
365 | |
366 | static void daemon__die(int n, void *p) |
367 | { |
368 | T( trace(TRACE_DAEMON, "daemon: killed by signal %i", n); ) |
369 | syslog(LOG_NOTICE, "killed by signal type %i", n); |
370 | remove(file_PID); |
371 | exit(0); |
372 | } |
373 | |
374 | /* --- @daemon__setTimer@ --- * |
375 | * |
376 | * Arguments: --- |
377 | * |
378 | * Returns: --- |
379 | * |
380 | * Use: Sets the interval timer up. |
381 | */ |
382 | |
383 | static void daemon__wakeUp(struct timeval *tv, void *p); |
384 | |
385 | static void daemon__setTimer(void) |
386 | { |
387 | struct timeval tv; |
388 | |
389 | gettimeofday(&tv, 0); |
390 | tv.tv_sec += daemon__awakeEvery; |
391 | sel_addtimer(&daemon__sel, &daemon__timer, &tv, daemon__wakeUp, 0); |
392 | } |
393 | |
394 | /* --- @daemon__rescan@ --- * |
395 | * |
396 | * Arguments: @int n@ = signal number |
397 | * @void *p@ = ignored |
398 | * |
399 | * Returns: --- |
400 | * |
401 | * Use: Forces a rescan of the daemon's configuration. |
402 | */ |
403 | |
404 | static void daemon__rescan(int n, void *p) |
405 | { |
406 | syslog(LOG_INFO, "rescanning configuration file"); |
407 | name_end(); |
408 | rule_end(); |
409 | netg_end(); |
410 | userdb_end(); |
411 | dsa_privfree(&daemon__key); |
412 | userdb_init(); |
413 | userdb_local(); |
414 | userdb_yp(); |
415 | netg_init(); |
416 | rule_init(); |
417 | name_init(); |
418 | if (daemon__readConfig(daemon__config)) |
419 | syslog(LOG_ERR, "error reading configuration file"); |
420 | sel_rmtimer(&daemon__timer); |
421 | daemon__setTimer(); |
422 | fwatch_update(&daemon__watch, daemon__config); |
423 | } |
424 | |
425 | /* --- @daemon__wakeUp@ --- * |
426 | * |
427 | * Arguments: @struct timeval *tv@ = ignored |
428 | * @void *p@ = ignored |
429 | * |
430 | * Returns: --- |
431 | * |
432 | * Use: Wakes up periodically to check the configuration file. |
433 | */ |
434 | |
435 | static void daemon__wakeUp(struct timeval *tv, void *p) |
436 | { |
437 | rand_seed(RAND_GLOBAL, 160); |
438 | if (fwatch_update(&daemon__watch, daemon__config)) |
439 | daemon__rescan(0, 0); |
c4f2d992 |
440 | } |
441 | |
442 | /* --- @daemon_init@ --- * |
443 | * |
444 | * Arguments: @const char *cf@ = pointer to name of configuration file |
445 | * @int port@ = port to listen to, or %$-1$% for default |
446 | * |
447 | * Returns: Never. |
448 | * |
449 | * Use: Starts `become' up in daemon mode. |
450 | */ |
451 | |
452 | void daemon_init(const char *cf, int port) |
453 | { |
454 | int s; |
f60a3434 |
455 | int i; |
456 | |
457 | static struct sigvec { |
458 | int sig; |
459 | void (*proc)(int n, void *p); |
460 | sig s; |
461 | } sigs[] = { |
462 | { SIGHUP, daemon__rescan }, |
463 | { SIGINT, daemon__die }, |
464 | { SIGTERM, daemon__die }, |
465 | { SIGQUIT, daemon__die }, |
466 | { 0, 0 } |
467 | }; |
c4f2d992 |
468 | |
469 | /* --- Remove my root privileges --- * |
470 | * |
471 | * Just in case there's anything dodgy in my configuration file, or the |
472 | * user wants me to start on a funny port. |
473 | */ |
474 | |
607937a4 |
475 | setuid(getuid()); |
c4f2d992 |
476 | |
f60a3434 |
477 | /* --- Initialize the random number generator --- */ |
478 | |
479 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
480 | rand_seed(RAND_GLOBAL, 160); |
481 | |
c4f2d992 |
482 | /* --- Initialise bits of the program --- */ |
483 | |
f60a3434 |
484 | daemon__config = cf; |
c4f2d992 |
485 | daemon__port = port; |
f60a3434 |
486 | sel_init(&daemon__sel); |
487 | sig_init(&daemon__sel); |
c4f2d992 |
488 | userdb_init(); |
489 | userdb_local(); |
490 | userdb_yp(); |
607937a4 |
491 | netg_init(); |
c4f2d992 |
492 | name_init(); |
493 | rule_init(); |
494 | openlog(quis(), 0, LOG_DAEMON); |
495 | syslog(LOG_NOTICE, "starting up"); |
496 | |
f60a3434 |
497 | if (daemon__readConfig(daemon__config)) |
498 | die(1, "couldn't read configuration file"); |
499 | fwatch_init(&daemon__watch, daemon__config); |
c4f2d992 |
500 | |
501 | /* --- Decide on a port to use --- * |
502 | * |
503 | * If I don't have a port yet (e.g., from the configuration file) then |
504 | * look it up in /etc/services under whatever name I was started as. |
505 | */ |
506 | |
0c6c5a97 |
507 | if (daemon__port == 0) { |
c4f2d992 |
508 | struct servent *se = getservbyname(quis(), "udp"); |
509 | if (!se) |
f60a3434 |
510 | die(1, "no idea which port to listen to"); |
f3debbd8 |
511 | daemon__port = se->s_port; |
c4f2d992 |
512 | } |
513 | |
514 | /* --- Now set up a socket --- */ |
515 | |
516 | { |
517 | struct sockaddr_in sin; |
518 | |
519 | if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
f60a3434 |
520 | die(1, "couldn't create socket: %s", strerror(errno)); |
c4f2d992 |
521 | sin.sin_family = AF_INET; |
0c6c5a97 |
522 | sin.sin_port = daemon__port; |
c4f2d992 |
523 | sin.sin_addr.s_addr = htonl(INADDR_ANY); |
0c6c5a97 |
524 | if (bind(s, (struct sockaddr *)&sin, sizeof(sin))) { |
f60a3434 |
525 | die(1, "couldn't bind socket to port %i: %s", |
0c6c5a97 |
526 | ntohs(daemon__port), strerror(errno)); |
527 | } |
c4f2d992 |
528 | } |
529 | |
530 | /* --- Fork off into the sunset --- */ |
531 | |
532 | #ifdef NDEBUG |
533 | { |
534 | int pid = fork(); |
535 | FILE *fp; |
536 | |
537 | /* --- Make a background process --- */ |
538 | |
539 | if (pid == -1) |
f60a3434 |
540 | die(1, "couldn't fork daemon: %s", strerror(errno)); |
c4f2d992 |
541 | else if (pid != 0) |
542 | return; |
543 | |
544 | /* --- Disconnect from the terminal --- */ |
545 | |
546 | setsid(); |
547 | |
548 | /* --- Write my process id to a file --- */ |
549 | |
550 | if ((fp = fopen(file_PID, "w")) != 0) { |
551 | fprintf(fp, "%lu\n", (unsigned long)getpid()); |
552 | fclose(fp); |
553 | } |
03f996bd |
554 | T( trace(TRACE_DAEMON, "daemon: forked to pid %li", (long)getpid()); ) |
c4f2d992 |
555 | } |
556 | #endif |
557 | |
f60a3434 |
558 | /* --- Set signal handlers --- */ |
c4f2d992 |
559 | |
f60a3434 |
560 | for (i = 0; sigs[i].proc; i++) |
561 | sig_add(&sigs[i].s, sigs[i].sig, sigs[i].proc, 0); |
c4f2d992 |
562 | |
f60a3434 |
563 | /* --- Set the timer for rescanning the file --- */ |
c4f2d992 |
564 | |
f60a3434 |
565 | daemon__setTimer(); |
c4f2d992 |
566 | |
f60a3434 |
567 | /* --- Watch for input --- */ |
c4f2d992 |
568 | |
f60a3434 |
569 | sel_initfile(&daemon__sel, &daemon__listen, s, SEL_READ, |
570 | daemon__read, 0); |
571 | sel_addfile(&daemon__listen); |
c4f2d992 |
572 | |
f60a3434 |
573 | /* --- Now wait for something exciting to happen --- */ |
c4f2d992 |
574 | |
f60a3434 |
575 | for (;;) { |
576 | if (sel_select(&daemon__sel)) { |
577 | if (errno == EINTR || errno == EAGAIN) |
578 | continue; |
579 | syslog(LOG_ERR, "error from select: %s", strerror(errno)); |
580 | exit(1); |
c4f2d992 |
581 | } |
582 | } |
583 | } |
584 | |
585 | /*----- That's all, folks -------------------------------------------------*/ |