410c8acf |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: admin.c,v 1.1 2001/02/03 20:26:37 mdw Exp $ |
4 | * |
5 | * Admin interface for configuration |
6 | * |
7 | * (c) 2001 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Trivial IP Encryption (TrIPE). |
13 | * |
14 | * TrIPE 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 | * TrIPE 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 |
25 | * along with TrIPE; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: admin.c,v $ |
32 | * Revision 1.1 2001/02/03 20:26:37 mdw |
33 | * Initial checkin. |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include "tripe.h" |
40 | |
41 | /*----- Global variables --------------------------------------------------*/ |
42 | |
43 | #ifndef NTRACE |
44 | |
45 | const trace_opt tr_opts[] = { |
46 | { 't', T_TUNNEL, "tunnel events" }, |
47 | { 'r', T_PEER, "peer events" }, |
48 | { 'a', T_ADMIN, "admin interface" }, |
49 | { 'p', T_PACKET, "packet contents" }, |
50 | { 'c', T_CRYPTO, "crypto details" }, |
51 | { 's', T_KEYSET, "symmetric keyset management" }, |
52 | { 'x', T_KEYEXCH, "key exchange" }, |
53 | { 'm', T_KEYMGMT, "key management" }, |
54 | { 'A', T_ALL, "all of the above" }, |
55 | { 0, 0, 0 } |
56 | }; |
57 | |
58 | unsigned tr_flags = 0; |
59 | #endif |
60 | |
61 | /*----- Static variables --------------------------------------------------*/ |
62 | |
63 | static admin *admins; |
64 | static sel_file sock; |
65 | static const char *sockname; |
66 | static unsigned flags = 0; |
67 | static admin *a_stdin = 0; |
68 | static sig s_term, s_int, s_hup; |
69 | |
70 | #define F_DAEMON 1u |
71 | #define F_INIT 2u |
72 | |
73 | #define T_RESOLVE SEC(30) |
74 | |
75 | /*----- Utility functions -------------------------------------------------*/ |
76 | |
77 | /* --- @a_write@ --- * |
78 | * |
79 | * Arguments: @admin *a@ = admin connection to write to |
80 | * @const char *fmt@ = pointer to format string |
81 | * @...@ = other arguments |
82 | * |
83 | * Returns: --- |
84 | * |
85 | * Use: Sends a message to an admin connection. |
86 | */ |
87 | |
88 | static void a_write(admin *a, const char *fmt, ...) |
89 | { |
90 | va_list ap; |
91 | dstr d = DSTR_INIT; |
92 | va_start(ap, fmt); |
93 | dstr_vputf(&d, fmt, ap); |
94 | va_end(ap); |
95 | write(a->fd, d.buf, d.len); |
96 | dstr_destroy(&d); |
97 | } |
98 | |
99 | /* --- @a_warn@ --- * |
100 | * |
101 | * Arguments: @const char *fmt@ = pointer to format string |
102 | * @...@ = other arguments |
103 | * |
104 | * Returns: --- |
105 | * |
106 | * Use: Informs all admin connections of a warning. |
107 | */ |
108 | |
109 | void a_warn(const char *fmt, ...) |
110 | { |
111 | va_list ap; |
112 | admin *a; |
113 | dstr d = DSTR_INIT; |
114 | |
115 | if (flags & F_INIT) |
116 | dstr_puts(&d, "WARN "); |
117 | va_start(ap, fmt); |
118 | dstr_vputf(&d, fmt, ap); |
119 | va_end(ap); |
120 | if (!(flags & F_INIT)) |
121 | moan("%s", d.buf); |
122 | else { |
123 | dstr_putc(&d, '\n'); |
124 | for (a = admins; a; a = a->next) |
125 | write(a->fd, d.buf, d.len); |
126 | } |
127 | dstr_destroy(&d); |
128 | } |
129 | |
130 | /* --- @a_trace@ --- * |
131 | * |
132 | * Arguments: @const char *p@ = pointer to a buffer |
133 | * @size_t sz@ = size of the buffer |
134 | * @void *v@ = uninteresting pointer |
135 | * |
136 | * Returns: --- |
137 | * |
138 | * Use: Custom trace output handler. |
139 | */ |
140 | |
141 | #ifndef NTRACE |
142 | static void a_trace(const char *p, size_t sz, void *v) |
143 | { |
144 | dstr d = DSTR_INIT; |
145 | admin *a; |
146 | |
147 | dstr_puts(&d, "TRACE "); |
148 | dstr_putm(&d, p, sz); |
149 | dstr_putc(&d, '\n'); |
150 | for (a = admins; a; a = a->next) |
151 | write(a->fd, d.buf, d.len); |
152 | dstr_destroy(&d); |
153 | } |
154 | #endif |
155 | |
156 | /* --- @a_quit@ --- * |
157 | * |
158 | * Arguments: --- |
159 | * |
160 | * Returns: --- |
161 | * |
162 | * Use: Shuts things down nicely. |
163 | */ |
164 | |
165 | void a_quit(void) |
166 | { |
167 | close(sock.fd); |
168 | unlink(sockname); |
169 | exit(0); |
170 | } |
171 | |
172 | /* --- @a_sigdie@ --- * |
173 | * |
174 | * Arguments: @int sig@ = signal number |
175 | * @void *v@ = an uninteresting argument |
176 | * |
177 | * Returns: --- |
178 | * |
179 | * Use Shuts down on receipt of a fatal signal. |
180 | */ |
181 | |
182 | static void a_sigdie(int sig, void *v) |
183 | { |
184 | char *p; |
185 | char buf[20]; |
186 | |
187 | switch (sig) { |
188 | case SIGTERM: p = "SIGTERM"; break; |
189 | case SIGINT: p = "SIGINT"; break; |
190 | default: |
191 | sprintf(buf, "signal %i", sig); |
192 | p = buf; |
193 | break; |
194 | } |
195 | a_warn("shutting down on %s", p); |
196 | a_quit(); |
197 | } |
198 | |
199 | /* --- @a_sighup@ --- * |
200 | * |
201 | * Arguments: @int sig@ = signal number |
202 | * @void *v@ = an uninteresting argument |
203 | * |
204 | * Returns: --- |
205 | * |
206 | * Use Logs a message about SIGHUP not being useful. |
207 | */ |
208 | |
209 | static void a_sighup(int sig, void *v) |
210 | { |
211 | a_warn("received SIGHUP: ignoring"); |
212 | } |
213 | |
214 | /*----- Adding peers ------------------------------------------------------*/ |
215 | |
216 | /* --- @a_resolve@ --- * |
217 | * |
218 | * Arguments: @struct hostent *h@ = pointer to resolved hostname |
219 | * @void *v@ = pointer to admin block |
220 | * |
221 | * Returns: --- |
222 | * |
223 | * Use: Handles a completed name resolution. |
224 | */ |
225 | |
226 | static void a_resolve(struct hostent *h, void *v) |
227 | { |
228 | admin *a = v; |
229 | T( trace(T_ADMIN, "admin: %u resolved", a->seq); ) |
230 | sel_rmtimer(&a->t); |
231 | if (!h) |
232 | a_write(a, "ERR couldn't resolve hostname `%s'\n", a->paddr); |
233 | else if (p_find(a->pname)) |
234 | a_write(a, "ERR peer `%s' already registered\n", a->pname); |
235 | else { |
236 | memcpy(&a->peer.sin.sin_addr, h->h_addr, sizeof(struct in_addr)); |
237 | if (!p_create(a->pname, &a->peer.sa, a->sasz)) |
238 | a_write(a, "ERR couldn't create peer\n"); |
239 | else |
240 | a_write(a, "OK\n"); |
241 | } |
242 | xfree(a->pname); |
243 | xfree(a->paddr); |
244 | a->pname = 0; |
245 | selbuf_enable(&a->b); |
246 | } |
247 | |
248 | /* --- @a_timer@ --- * |
249 | * |
250 | * Arguments: @struct timeval *tv@ = timer |
251 | * @void *v@ = pointer to admin block |
252 | * |
253 | * Returns: --- |
254 | * |
255 | * Use: Times out a resolver. |
256 | */ |
257 | |
258 | static void a_timer(struct timeval *tv, void *v) |
259 | { |
260 | admin *a = v; |
261 | T( trace(T_ADMIN, "admin: %u resolver timeout", a->seq); ) |
262 | bres_abort(&a->r); |
263 | a_write(a, "ERR timeout resolving `%s'\n", a->paddr); |
264 | xfree(a->pname); |
265 | xfree(a->paddr); |
266 | a->pname = 0; |
267 | selbuf_enable(&a->b); |
268 | } |
269 | |
270 | /* --- @acmd_add@ --- * |
271 | * |
272 | * Arguments: @admin *a@ = connection which requested the addition |
273 | * @unsigned ac@ = argument count |
274 | * @char *av[]@ = pointer to the argument list |
275 | * |
276 | * Returns: --- |
277 | * |
278 | * Use: Adds a new peer. |
279 | */ |
280 | |
281 | static void acmd_add(admin *a, unsigned ac, char *av[]) |
282 | { |
283 | unsigned long pt; |
284 | struct timeval tv; |
285 | char *p; |
286 | |
287 | /* --- Make sure someone's not got there already --- */ |
288 | |
289 | if (p_find(av[0])) { |
290 | a_write(a, "ERR peer `%s' already registered\n", av[0]); |
291 | return; |
292 | } |
293 | |
294 | /* --- Fill in the easy bits of address --- */ |
295 | |
296 | BURN(a->peer); |
297 | a->peer.sin.sin_family = AF_INET; |
298 | a->sasz = sizeof(a->peer.sin); |
299 | pt = strtoul(av[2], &p, 0); |
300 | if (*p) { |
301 | struct servent *s = getservbyname(av[2], "udp"); |
302 | if (!s) { |
303 | a_write(a, "ERR service `%s' not known\n", av[2]); |
304 | return; |
305 | } |
306 | pt = ntohs(s->s_port); |
307 | } |
308 | if (pt == 0 || pt >= 65536) { |
309 | a_write(a, "ERR bad port number %lu\n", pt); |
310 | return; |
311 | } |
312 | a->peer.sin.sin_port = htons(pt); |
313 | |
314 | /* --- If the name is numeric, do it the easy way --- */ |
315 | |
316 | if (inet_aton(av[1], &a->peer.sin.sin_addr)) { |
317 | if (!p_create(av[0], &a->peer.sa, a->sasz)) |
318 | a_write(a, "ERR couldn't create peer\n"); |
319 | else |
320 | a_write(a, "OK\n"); |
321 | return; |
322 | } |
323 | |
324 | /* --- Store everything for later and crank up the resolver --- * |
325 | * |
326 | * We disable the line buffer until the resolver completes (or times out). |
327 | * This prevents other commands on the same connection (though the rest of |
328 | * the system continues regardless), but makes life simpler for the client. |
329 | */ |
330 | |
331 | a->pname = xstrdup(av[0]); |
332 | a->paddr = xstrdup(av[1]); |
333 | selbuf_disable(&a->b); |
334 | gettimeofday(&tv, 0); |
335 | tv.tv_sec += T_RESOLVE; |
336 | sel_addtimer(&sel, &a->t, &tv, a_timer, a); |
337 | bres_byname(&a->r, a->paddr, a_resolve, a); |
338 | T( trace(T_ADMIN, "admin: %u resolving hostname `%s'", |
339 | a->seq, a->paddr); ) |
340 | } |
341 | |
342 | /*----- Administration commands -------------------------------------------*/ |
343 | |
344 | /* --- Miscellaneous commands --- */ |
345 | |
346 | #ifndef NTRACE |
347 | |
348 | static void acmd_trace(admin *a, unsigned ac, char *av[]) |
349 | { |
350 | if (!ac || strcmp(av[0], "?") == 0) { |
351 | const trace_opt *t; |
352 | a_write(a, "INFO Trace options:\n"); |
353 | for (t = tr_opts; t->ch; t++) { |
354 | a_write(a, "INFO %c %c %s\n", |
355 | t->ch, (tr_flags & t->f) == t->f ? '*' : ' ', t->help); |
356 | } |
357 | } else { |
358 | unsigned sense = 1; |
359 | unsigned f = tr_flags; |
360 | const trace_opt *tt; |
361 | char *p = av[0]; |
362 | |
363 | while (*p) { |
364 | switch (*p) { |
365 | case '+': sense = 1; break; |
366 | case '-': sense = 0; break; |
367 | default: |
368 | for (tt = tr_opts; tt->ch; tt++) { |
369 | if (tt->ch == *p) { |
370 | if (sense) f |= tt->f; |
371 | else f &= ~tt->f; |
372 | goto tropt_ok; |
373 | } |
374 | } |
375 | a_write(a, "ERR unknown trace option `%c'\n", *p); |
376 | return; |
377 | tropt_ok:; |
378 | break; |
379 | } |
380 | p++; |
381 | } |
382 | tr_flags = f; |
383 | trace_level(tr_flags); |
384 | } |
385 | a_write(a, "OK\n"); |
386 | } |
387 | |
388 | #endif |
389 | |
390 | static void acmd_port(admin *a, unsigned ac, char *av[]) |
391 | { |
392 | a_write(a, "INFO %u\nOK\n", p_port()); |
393 | } |
394 | |
395 | static void a_destroy(admin */*a*/); |
396 | |
397 | static void acmd_daemon(admin *a, unsigned ac, char *av[]) |
398 | { |
399 | if (flags & F_DAEMON) |
400 | a_write(a, "ERR already running as a daemon\n"); |
401 | else { |
402 | if (a_stdin) { |
403 | a_write(a_stdin, "WARN becoming a daemon\n"); |
404 | a_destroy(a_stdin); |
405 | } |
406 | if (u_daemon()) |
407 | a_write(a, "ERR error becoming a daemon: %s", strerror(errno)); |
408 | else |
409 | flags |= F_DAEMON; |
410 | } |
411 | } |
412 | |
413 | static void acmd_list(admin *a, unsigned ac, char *av[]) |
414 | { |
415 | peer *p; |
416 | for (p = p_first(); p; p = p_next(p)) |
417 | a_write(a, "INFO %s\n", p_name(p)); |
418 | a_write(a, "OK\n"); |
419 | } |
420 | |
421 | static void acmd_ifname(admin *a, unsigned ac, char *av[]) |
422 | { |
423 | peer *p; |
424 | |
425 | if ((p = p_find(av[0])) == 0) |
426 | a_write(a, "ERR peer `%s' not found\n", av[0]); |
427 | else |
428 | a_write(a, "INFO %s\nOK\n", p_ifname(p)); |
429 | } |
430 | |
431 | static void acmd_addr(admin *a, unsigned ac, char *av[]) |
432 | { |
433 | peer *p; |
434 | const addr *ad; |
435 | |
436 | if ((p = p_find(av[0])) == 0) |
437 | a_write(a, "ERR peer `%s' not found\n", av[0]); |
438 | else { |
439 | ad = p_addr(p); |
440 | assert(ad->sa.sa_family == AF_INET); |
441 | a_write(a, "INFO %s %u\nOK\n", |
442 | inet_ntoa(ad->sin.sin_addr), |
443 | (unsigned)ntohs(ad->sin.sin_port)); |
444 | } |
445 | } |
446 | |
447 | static void acmd_kill(admin *a, unsigned ac, char *av[]) |
448 | { |
449 | peer *p; |
450 | if ((p = p_find(av[0])) == 0) |
451 | a_write(a, "ERR peer `%s' not found\n", av[0]); |
452 | else { |
453 | p_destroy(p); |
454 | a_write(a, "OK\n"); |
455 | } |
456 | } |
457 | |
458 | static void acmd_quit(admin *a, unsigned ac, char *av[]) |
459 | { |
460 | a_warn("closing down on admin request"); |
461 | a_quit(); |
462 | } |
463 | |
464 | /* --- The command table and help --- */ |
465 | |
466 | typedef struct acmd { |
467 | const char *name; |
468 | const char *help; |
469 | unsigned argmin, argmax; |
470 | void (*func)(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
471 | } acmd; |
472 | |
473 | static void acmd_help(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
474 | |
475 | static const acmd acmdtab[] = { |
476 | { "help", "HELP", 0, 0, acmd_help }, |
477 | #ifndef NTRACE |
478 | { "trace", "TRACE [options]", 0, 1, acmd_trace }, |
479 | #endif |
480 | { "port", "PORT", 0, 0, acmd_port }, |
481 | { "daemon", "DAEMON", 0, 0, acmd_daemon }, |
482 | { "list", "LIST", 0, 0, acmd_list }, |
483 | { "ifname", "IFNAME peer", 1, 1, acmd_ifname }, |
484 | { "addr", "ADDR peer", 1, 1, acmd_addr }, |
485 | { "kill", "KILL peer", 1, 1, acmd_kill }, |
486 | { "add", "ADD peer addr port", 3, 3, acmd_add }, |
487 | { "quit", "QUIT", 0, 0, acmd_quit }, |
488 | { 0, 0, 0, 0, 0 } |
489 | }; |
490 | |
491 | static void acmd_help(admin *a, unsigned ac, char *av[]) |
492 | { |
493 | const acmd *c; |
494 | for (c = acmdtab; c->name; c++) |
495 | a_write(a, "INFO %s\n", c->help); |
496 | a_write(a, "OK\n"); |
497 | } |
498 | |
499 | /*----- Connection handling -----------------------------------------------*/ |
500 | |
501 | /* --- @a_destroy@ --- * |
502 | * |
503 | * Arguments: @admin *a@ = pointer to an admin block |
504 | * |
505 | * Returns: --- |
506 | * |
507 | * Use: Destroys an admin block. |
508 | */ |
509 | |
510 | static void a_destroy(admin *a) |
511 | { |
512 | T( trace(T_ADMIN, "admin: destroying connection %u", a->seq); ) |
513 | selbuf_destroy(&a->b); |
514 | if (a->b.reader.fd != a->fd) |
515 | close(a->b.reader.fd); |
516 | close(a->fd); |
517 | if (a->pname) { |
518 | xfree(a->pname); |
519 | xfree(a->paddr); |
520 | bres_abort(&a->r); |
521 | sel_rmtimer(&a->t); |
522 | } |
523 | if (a->next) |
524 | a->next->prev = a->prev; |
525 | if (a->prev) |
526 | a->prev->next = a->next; |
527 | else |
528 | admins = a->next; |
529 | if (a_stdin == a) |
530 | a_stdin = 0; |
531 | DESTROY(a); |
532 | } |
533 | |
534 | /* --- @a_line@ --- * |
535 | * |
536 | * Arguments: @char *p@ = pointer to the line read |
537 | * @void *vp@ = pointer to my admin block |
538 | * |
539 | * Returns: --- |
540 | * |
541 | * Use: Handles a line of input. |
542 | */ |
543 | |
544 | static void a_line(char *p, void *vp) |
545 | { |
546 | admin *a = vp; |
547 | const acmd *c; |
548 | char *av[4]; |
549 | size_t ac; |
550 | |
551 | if (!p) { |
552 | a_destroy(a); |
553 | return; |
554 | } |
555 | ac = str_qsplit(p, av, 4, 0, STRF_QUOTE); |
556 | if (!ac) |
557 | return; |
558 | for (p = av[0]; *p; p++) *p = tolower((unsigned char)*p); |
559 | for (c = acmdtab; c->name; c++) { |
560 | if (strcmp(av[0], c->name) == 0) { |
561 | ac--; |
562 | if (c->argmin > ac || ac > c->argmax) |
563 | a_write(a, "ERR syntax: %s\n", c->help); |
564 | else |
565 | c->func(a, ac, av + 1); |
566 | return; |
567 | } |
568 | } |
569 | a_write(a, "ERR unknown command `%s'\n", av[0]); |
570 | } |
571 | |
572 | /* --- @a_create@ --- * |
573 | * |
574 | * Arguments: @int fd_in, fd_out@ = file descriptors to use |
575 | * |
576 | * Returns: --- |
577 | * |
578 | * Use: Creates a new admin connection. |
579 | */ |
580 | |
581 | void a_create(int fd_in, int fd_out) |
582 | { |
583 | admin *a = CREATE(admin); |
584 | T( static unsigned seq = 0; ) |
585 | a->seq = seq++; |
586 | T( trace(T_ADMIN, "admin: accepted connection %u", a->seq); ) |
587 | a->pname = 0; |
588 | if (fd_in == STDIN_FILENO) |
589 | a_stdin = a; |
590 | fdflags(fd_in, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
591 | if (fd_out != fd_in) |
592 | fdflags(fd_out, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
593 | a->fd = fd_out; |
594 | selbuf_init(&a->b, &sel, fd_in, a_line, a); |
595 | a->next = admins; |
596 | a->prev = 0; |
597 | if (admins) |
598 | admins->prev = a; |
599 | admins = a; |
600 | } |
601 | |
602 | /* --- @a_accept@ --- * |
603 | * |
604 | * Arguments: @int fd@ = file descriptor to accept |
605 | * @unsigned mode@ = what to do |
606 | * @void *v@ = uninteresting pointer |
607 | * |
608 | * Returns: --- |
609 | * |
610 | * Use: Accepts a new admin connection. |
611 | */ |
612 | |
613 | static void a_accept(int fd, unsigned mode, void *v) |
614 | { |
615 | int nfd; |
616 | struct sockaddr_un sun; |
617 | size_t sz = sizeof(sun); |
618 | |
619 | if ((nfd = accept(fd, (struct sockaddr *)&sun, &sz)) < 0) { |
620 | a_warn("accept admin connection failed: %s", strerror(errno)); |
621 | return; |
622 | } |
623 | a_create(nfd, nfd); |
624 | } |
625 | |
626 | /* --- @a_daemon@ --- * |
627 | * |
628 | * Arguments: --- |
629 | * |
630 | * Returns: --- |
631 | * |
632 | * Use: Informs the admin module that it's a daemon. |
633 | */ |
634 | |
635 | void a_daemon(void) |
636 | { |
637 | flags |= F_DAEMON; |
638 | } |
639 | |
640 | /* --- @a_init@ --- * |
641 | * |
642 | * Arguments: @const char *name@ = socket name to create |
643 | * |
644 | * Returns: --- |
645 | * |
646 | * Use: Creates the admin listening socket. |
647 | */ |
648 | |
649 | void a_init(const char *name) |
650 | { |
651 | int fd; |
652 | int n = 5; |
653 | struct sockaddr_un sun; |
654 | struct sigaction sa; |
655 | size_t sz; |
656 | |
657 | /* --- Set up the socket address --- */ |
658 | |
659 | sz = strlen(name) + 1; |
660 | if (sz > sizeof(sun.sun_path)) |
661 | die(EXIT_FAILURE, "socket name `%s' too long", name); |
662 | BURN(sun); |
663 | sun.sun_family = AF_UNIX; |
664 | memcpy(sun.sun_path, name, sz); |
665 | sz += offsetof(struct sockaddr_un, sun_path); |
666 | |
667 | /* --- Attempt to bind to the socket --- */ |
668 | |
669 | umask(0077); |
670 | again: |
671 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
672 | die(EXIT_FAILURE, "couldn't create socket: %s", strerror(errno)); |
673 | if (bind(fd, (struct sockaddr *)&sun, sz) < 0) { |
674 | struct stat st; |
675 | int e = errno; |
676 | if (errno != EADDRINUSE) { |
677 | die(EXIT_FAILURE, "couldn't bind to address `%s': %s", |
678 | sun.sun_path, strerror(e)); |
679 | } |
680 | if (!n) |
681 | die(EXIT_FAILURE, "too many retries; giving up"); |
682 | n--; |
683 | if (!connect(fd, (struct sockaddr *)&sun, sz)) { |
684 | die(EXIT_FAILURE, "server already listening on admin socket `%s'", |
685 | sun.sun_path); |
686 | } |
687 | if (errno != ECONNREFUSED) |
688 | die(EXIT_FAILURE, "couldn't bind to address: %s", strerror(e)); |
689 | if (stat(sun.sun_path, &st)) { |
690 | die(EXIT_FAILURE, "couldn't stat `%s': %s", |
691 | sun.sun_path, strerror(errno)); |
692 | } |
693 | if (!S_ISSOCK(st.st_mode)) |
694 | die(EXIT_FAILURE, "object `%s' isn't a socket", sun.sun_path); |
695 | T( trace(T_ADMIN, "stale socket found; removing it"); ) |
696 | unlink(sun.sun_path); |
697 | close(fd); |
698 | goto again; |
699 | } |
700 | chmod(sun.sun_path, 0600); |
701 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
702 | if (listen(fd, 5)) |
703 | die(EXIT_FAILURE, "couldn't listen on socket: %s", strerror(errno)); |
704 | |
705 | /* --- Listen to the socket --- */ |
706 | |
707 | sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0); |
708 | sel_addfile(&sock); |
709 | sockname = name; |
710 | bres_init(&sel); |
711 | T( trace_custom(a_trace, 0); |
712 | trace(T_ADMIN, "admin: enabled custom tracing"); ) |
713 | flags |= F_INIT; |
714 | |
715 | /* --- Set up signal handlers --- */ |
716 | |
717 | sig_add(&s_term, SIGTERM, a_sigdie, 0); |
718 | sig_add(&s_hup, SIGHUP, a_sighup, 0); |
719 | sigaction(SIGINT, 0, &sa); |
720 | if (sa.sa_handler != SIG_IGN) |
721 | sig_add(&s_int, SIGINT, a_sigdie, 0); |
722 | } |
723 | |
724 | /*----- That's all, folks -------------------------------------------------*/ |