410c8acf |
1 | /* -*-c-*- |
2 | * |
93bee2c4 |
3 | * $Id: admin.c,v 1.3 2001/02/04 01:17:12 mdw Exp $ |
410c8acf |
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 $ |
93bee2c4 |
32 | * Revision 1.3 2001/02/04 01:17:12 mdw |
33 | * The `DAEMON' notification to stdout is replaced by a warning. The |
34 | * `DAEMON' and `QUIT' command send `OK' on successful completion. Put |
35 | * assignment of sequence number in a T(...) guard. |
36 | * |
8d0c7a83 |
37 | * Revision 1.2 2001/02/03 22:40:29 mdw |
38 | * Put timer information into the entropy pool when packets are received |
39 | * and on similar events. Reseed the generator on the interval timer. |
40 | * |
410c8acf |
41 | * Revision 1.1 2001/02/03 20:26:37 mdw |
42 | * Initial checkin. |
43 | * |
44 | */ |
45 | |
46 | /*----- Header files ------------------------------------------------------*/ |
47 | |
48 | #include "tripe.h" |
49 | |
50 | /*----- Global variables --------------------------------------------------*/ |
51 | |
52 | #ifndef NTRACE |
53 | |
54 | const trace_opt tr_opts[] = { |
55 | { 't', T_TUNNEL, "tunnel events" }, |
56 | { 'r', T_PEER, "peer events" }, |
57 | { 'a', T_ADMIN, "admin interface" }, |
58 | { 'p', T_PACKET, "packet contents" }, |
59 | { 'c', T_CRYPTO, "crypto details" }, |
60 | { 's', T_KEYSET, "symmetric keyset management" }, |
61 | { 'x', T_KEYEXCH, "key exchange" }, |
62 | { 'm', T_KEYMGMT, "key management" }, |
63 | { 'A', T_ALL, "all of the above" }, |
64 | { 0, 0, 0 } |
65 | }; |
66 | |
67 | unsigned tr_flags = 0; |
68 | #endif |
69 | |
70 | /*----- Static variables --------------------------------------------------*/ |
71 | |
72 | static admin *admins; |
73 | static sel_file sock; |
74 | static const char *sockname; |
75 | static unsigned flags = 0; |
76 | static admin *a_stdin = 0; |
77 | static sig s_term, s_int, s_hup; |
78 | |
79 | #define F_DAEMON 1u |
80 | #define F_INIT 2u |
81 | |
82 | #define T_RESOLVE SEC(30) |
83 | |
84 | /*----- Utility functions -------------------------------------------------*/ |
85 | |
86 | /* --- @a_write@ --- * |
87 | * |
88 | * Arguments: @admin *a@ = admin connection to write to |
89 | * @const char *fmt@ = pointer to format string |
90 | * @...@ = other arguments |
91 | * |
92 | * Returns: --- |
93 | * |
94 | * Use: Sends a message to an admin connection. |
95 | */ |
96 | |
97 | static void a_write(admin *a, const char *fmt, ...) |
98 | { |
99 | va_list ap; |
100 | dstr d = DSTR_INIT; |
101 | va_start(ap, fmt); |
102 | dstr_vputf(&d, fmt, ap); |
103 | va_end(ap); |
104 | write(a->fd, d.buf, d.len); |
105 | dstr_destroy(&d); |
106 | } |
107 | |
108 | /* --- @a_warn@ --- * |
109 | * |
110 | * Arguments: @const char *fmt@ = pointer to format string |
111 | * @...@ = other arguments |
112 | * |
113 | * Returns: --- |
114 | * |
115 | * Use: Informs all admin connections of a warning. |
116 | */ |
117 | |
118 | void a_warn(const char *fmt, ...) |
119 | { |
120 | va_list ap; |
121 | admin *a; |
122 | dstr d = DSTR_INIT; |
123 | |
124 | if (flags & F_INIT) |
125 | dstr_puts(&d, "WARN "); |
126 | va_start(ap, fmt); |
127 | dstr_vputf(&d, fmt, ap); |
128 | va_end(ap); |
129 | if (!(flags & F_INIT)) |
130 | moan("%s", d.buf); |
131 | else { |
132 | dstr_putc(&d, '\n'); |
133 | for (a = admins; a; a = a->next) |
134 | write(a->fd, d.buf, d.len); |
135 | } |
136 | dstr_destroy(&d); |
137 | } |
138 | |
139 | /* --- @a_trace@ --- * |
140 | * |
141 | * Arguments: @const char *p@ = pointer to a buffer |
142 | * @size_t sz@ = size of the buffer |
143 | * @void *v@ = uninteresting pointer |
144 | * |
145 | * Returns: --- |
146 | * |
147 | * Use: Custom trace output handler. |
148 | */ |
149 | |
150 | #ifndef NTRACE |
151 | static void a_trace(const char *p, size_t sz, void *v) |
152 | { |
153 | dstr d = DSTR_INIT; |
154 | admin *a; |
155 | |
156 | dstr_puts(&d, "TRACE "); |
157 | dstr_putm(&d, p, sz); |
158 | dstr_putc(&d, '\n'); |
159 | for (a = admins; a; a = a->next) |
160 | write(a->fd, d.buf, d.len); |
161 | dstr_destroy(&d); |
162 | } |
163 | #endif |
164 | |
165 | /* --- @a_quit@ --- * |
166 | * |
167 | * Arguments: --- |
168 | * |
169 | * Returns: --- |
170 | * |
171 | * Use: Shuts things down nicely. |
172 | */ |
173 | |
174 | void a_quit(void) |
175 | { |
176 | close(sock.fd); |
177 | unlink(sockname); |
178 | exit(0); |
179 | } |
180 | |
181 | /* --- @a_sigdie@ --- * |
182 | * |
183 | * Arguments: @int sig@ = signal number |
184 | * @void *v@ = an uninteresting argument |
185 | * |
186 | * Returns: --- |
187 | * |
188 | * Use Shuts down on receipt of a fatal signal. |
189 | */ |
190 | |
191 | static void a_sigdie(int sig, void *v) |
192 | { |
193 | char *p; |
194 | char buf[20]; |
195 | |
196 | switch (sig) { |
197 | case SIGTERM: p = "SIGTERM"; break; |
198 | case SIGINT: p = "SIGINT"; break; |
199 | default: |
200 | sprintf(buf, "signal %i", sig); |
201 | p = buf; |
202 | break; |
203 | } |
204 | a_warn("shutting down on %s", p); |
205 | a_quit(); |
206 | } |
207 | |
208 | /* --- @a_sighup@ --- * |
209 | * |
210 | * Arguments: @int sig@ = signal number |
211 | * @void *v@ = an uninteresting argument |
212 | * |
213 | * Returns: --- |
214 | * |
215 | * Use Logs a message about SIGHUP not being useful. |
216 | */ |
217 | |
218 | static void a_sighup(int sig, void *v) |
219 | { |
220 | a_warn("received SIGHUP: ignoring"); |
221 | } |
222 | |
223 | /*----- Adding peers ------------------------------------------------------*/ |
224 | |
225 | /* --- @a_resolve@ --- * |
226 | * |
227 | * Arguments: @struct hostent *h@ = pointer to resolved hostname |
228 | * @void *v@ = pointer to admin block |
229 | * |
230 | * Returns: --- |
231 | * |
232 | * Use: Handles a completed name resolution. |
233 | */ |
234 | |
235 | static void a_resolve(struct hostent *h, void *v) |
236 | { |
237 | admin *a = v; |
238 | T( trace(T_ADMIN, "admin: %u resolved", a->seq); ) |
8d0c7a83 |
239 | TIMER; |
410c8acf |
240 | sel_rmtimer(&a->t); |
241 | if (!h) |
242 | a_write(a, "ERR couldn't resolve hostname `%s'\n", a->paddr); |
243 | else if (p_find(a->pname)) |
244 | a_write(a, "ERR peer `%s' already registered\n", a->pname); |
245 | else { |
246 | memcpy(&a->peer.sin.sin_addr, h->h_addr, sizeof(struct in_addr)); |
247 | if (!p_create(a->pname, &a->peer.sa, a->sasz)) |
248 | a_write(a, "ERR couldn't create peer\n"); |
249 | else |
250 | a_write(a, "OK\n"); |
251 | } |
252 | xfree(a->pname); |
253 | xfree(a->paddr); |
254 | a->pname = 0; |
255 | selbuf_enable(&a->b); |
256 | } |
257 | |
258 | /* --- @a_timer@ --- * |
259 | * |
260 | * Arguments: @struct timeval *tv@ = timer |
261 | * @void *v@ = pointer to admin block |
262 | * |
263 | * Returns: --- |
264 | * |
265 | * Use: Times out a resolver. |
266 | */ |
267 | |
268 | static void a_timer(struct timeval *tv, void *v) |
269 | { |
270 | admin *a = v; |
271 | T( trace(T_ADMIN, "admin: %u resolver timeout", a->seq); ) |
272 | bres_abort(&a->r); |
273 | a_write(a, "ERR timeout resolving `%s'\n", a->paddr); |
274 | xfree(a->pname); |
275 | xfree(a->paddr); |
276 | a->pname = 0; |
277 | selbuf_enable(&a->b); |
278 | } |
279 | |
280 | /* --- @acmd_add@ --- * |
281 | * |
282 | * Arguments: @admin *a@ = connection which requested the addition |
283 | * @unsigned ac@ = argument count |
284 | * @char *av[]@ = pointer to the argument list |
285 | * |
286 | * Returns: --- |
287 | * |
288 | * Use: Adds a new peer. |
289 | */ |
290 | |
291 | static void acmd_add(admin *a, unsigned ac, char *av[]) |
292 | { |
293 | unsigned long pt; |
294 | struct timeval tv; |
295 | char *p; |
296 | |
297 | /* --- Make sure someone's not got there already --- */ |
298 | |
299 | if (p_find(av[0])) { |
300 | a_write(a, "ERR peer `%s' already registered\n", av[0]); |
301 | return; |
302 | } |
303 | |
304 | /* --- Fill in the easy bits of address --- */ |
305 | |
306 | BURN(a->peer); |
307 | a->peer.sin.sin_family = AF_INET; |
308 | a->sasz = sizeof(a->peer.sin); |
309 | pt = strtoul(av[2], &p, 0); |
310 | if (*p) { |
311 | struct servent *s = getservbyname(av[2], "udp"); |
312 | if (!s) { |
313 | a_write(a, "ERR service `%s' not known\n", av[2]); |
314 | return; |
315 | } |
316 | pt = ntohs(s->s_port); |
317 | } |
318 | if (pt == 0 || pt >= 65536) { |
319 | a_write(a, "ERR bad port number %lu\n", pt); |
320 | return; |
321 | } |
322 | a->peer.sin.sin_port = htons(pt); |
323 | |
324 | /* --- If the name is numeric, do it the easy way --- */ |
325 | |
326 | if (inet_aton(av[1], &a->peer.sin.sin_addr)) { |
327 | if (!p_create(av[0], &a->peer.sa, a->sasz)) |
328 | a_write(a, "ERR couldn't create peer\n"); |
329 | else |
330 | a_write(a, "OK\n"); |
331 | return; |
332 | } |
333 | |
334 | /* --- Store everything for later and crank up the resolver --- * |
335 | * |
336 | * We disable the line buffer until the resolver completes (or times out). |
337 | * This prevents other commands on the same connection (though the rest of |
338 | * the system continues regardless), but makes life simpler for the client. |
339 | */ |
340 | |
341 | a->pname = xstrdup(av[0]); |
342 | a->paddr = xstrdup(av[1]); |
343 | selbuf_disable(&a->b); |
344 | gettimeofday(&tv, 0); |
345 | tv.tv_sec += T_RESOLVE; |
346 | sel_addtimer(&sel, &a->t, &tv, a_timer, a); |
347 | bres_byname(&a->r, a->paddr, a_resolve, a); |
348 | T( trace(T_ADMIN, "admin: %u resolving hostname `%s'", |
349 | a->seq, a->paddr); ) |
350 | } |
351 | |
352 | /*----- Administration commands -------------------------------------------*/ |
353 | |
354 | /* --- Miscellaneous commands --- */ |
355 | |
356 | #ifndef NTRACE |
357 | |
358 | static void acmd_trace(admin *a, unsigned ac, char *av[]) |
359 | { |
360 | if (!ac || strcmp(av[0], "?") == 0) { |
361 | const trace_opt *t; |
362 | a_write(a, "INFO Trace options:\n"); |
363 | for (t = tr_opts; t->ch; t++) { |
364 | a_write(a, "INFO %c %c %s\n", |
365 | t->ch, (tr_flags & t->f) == t->f ? '*' : ' ', t->help); |
366 | } |
367 | } else { |
368 | unsigned sense = 1; |
369 | unsigned f = tr_flags; |
370 | const trace_opt *tt; |
371 | char *p = av[0]; |
372 | |
373 | while (*p) { |
374 | switch (*p) { |
375 | case '+': sense = 1; break; |
376 | case '-': sense = 0; break; |
377 | default: |
378 | for (tt = tr_opts; tt->ch; tt++) { |
379 | if (tt->ch == *p) { |
380 | if (sense) f |= tt->f; |
381 | else f &= ~tt->f; |
382 | goto tropt_ok; |
383 | } |
384 | } |
385 | a_write(a, "ERR unknown trace option `%c'\n", *p); |
386 | return; |
387 | tropt_ok:; |
388 | break; |
389 | } |
390 | p++; |
391 | } |
392 | tr_flags = f; |
393 | trace_level(tr_flags); |
394 | } |
395 | a_write(a, "OK\n"); |
396 | } |
397 | |
398 | #endif |
399 | |
400 | static void acmd_port(admin *a, unsigned ac, char *av[]) |
401 | { |
402 | a_write(a, "INFO %u\nOK\n", p_port()); |
403 | } |
404 | |
405 | static void a_destroy(admin */*a*/); |
406 | |
407 | static void acmd_daemon(admin *a, unsigned ac, char *av[]) |
408 | { |
409 | if (flags & F_DAEMON) |
410 | a_write(a, "ERR already running as a daemon\n"); |
411 | else { |
93bee2c4 |
412 | a_warn("becoming a daemon"); |
413 | if (a_stdin) |
410c8acf |
414 | a_destroy(a_stdin); |
410c8acf |
415 | if (u_daemon()) |
416 | a_write(a, "ERR error becoming a daemon: %s", strerror(errno)); |
93bee2c4 |
417 | else { |
410c8acf |
418 | flags |= F_DAEMON; |
93bee2c4 |
419 | a_write(a, "OK\n"); |
420 | } |
410c8acf |
421 | } |
422 | } |
423 | |
424 | static void acmd_list(admin *a, unsigned ac, char *av[]) |
425 | { |
426 | peer *p; |
427 | for (p = p_first(); p; p = p_next(p)) |
428 | a_write(a, "INFO %s\n", p_name(p)); |
429 | a_write(a, "OK\n"); |
430 | } |
431 | |
432 | static void acmd_ifname(admin *a, unsigned ac, char *av[]) |
433 | { |
434 | peer *p; |
435 | |
436 | if ((p = p_find(av[0])) == 0) |
437 | a_write(a, "ERR peer `%s' not found\n", av[0]); |
438 | else |
439 | a_write(a, "INFO %s\nOK\n", p_ifname(p)); |
440 | } |
441 | |
442 | static void acmd_addr(admin *a, unsigned ac, char *av[]) |
443 | { |
444 | peer *p; |
445 | const addr *ad; |
446 | |
447 | if ((p = p_find(av[0])) == 0) |
448 | a_write(a, "ERR peer `%s' not found\n", av[0]); |
449 | else { |
450 | ad = p_addr(p); |
451 | assert(ad->sa.sa_family == AF_INET); |
452 | a_write(a, "INFO %s %u\nOK\n", |
453 | inet_ntoa(ad->sin.sin_addr), |
454 | (unsigned)ntohs(ad->sin.sin_port)); |
455 | } |
456 | } |
457 | |
458 | static void acmd_kill(admin *a, unsigned ac, char *av[]) |
459 | { |
460 | peer *p; |
461 | if ((p = p_find(av[0])) == 0) |
462 | a_write(a, "ERR peer `%s' not found\n", av[0]); |
463 | else { |
464 | p_destroy(p); |
465 | a_write(a, "OK\n"); |
466 | } |
467 | } |
468 | |
469 | static void acmd_quit(admin *a, unsigned ac, char *av[]) |
470 | { |
471 | a_warn("closing down on admin request"); |
93bee2c4 |
472 | a_write(a, "OK\n"); |
410c8acf |
473 | a_quit(); |
474 | } |
475 | |
476 | /* --- The command table and help --- */ |
477 | |
478 | typedef struct acmd { |
479 | const char *name; |
480 | const char *help; |
481 | unsigned argmin, argmax; |
482 | void (*func)(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
483 | } acmd; |
484 | |
485 | static void acmd_help(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
486 | |
487 | static const acmd acmdtab[] = { |
488 | { "help", "HELP", 0, 0, acmd_help }, |
489 | #ifndef NTRACE |
490 | { "trace", "TRACE [options]", 0, 1, acmd_trace }, |
491 | #endif |
492 | { "port", "PORT", 0, 0, acmd_port }, |
493 | { "daemon", "DAEMON", 0, 0, acmd_daemon }, |
494 | { "list", "LIST", 0, 0, acmd_list }, |
495 | { "ifname", "IFNAME peer", 1, 1, acmd_ifname }, |
496 | { "addr", "ADDR peer", 1, 1, acmd_addr }, |
497 | { "kill", "KILL peer", 1, 1, acmd_kill }, |
498 | { "add", "ADD peer addr port", 3, 3, acmd_add }, |
499 | { "quit", "QUIT", 0, 0, acmd_quit }, |
500 | { 0, 0, 0, 0, 0 } |
501 | }; |
502 | |
503 | static void acmd_help(admin *a, unsigned ac, char *av[]) |
504 | { |
505 | const acmd *c; |
506 | for (c = acmdtab; c->name; c++) |
507 | a_write(a, "INFO %s\n", c->help); |
508 | a_write(a, "OK\n"); |
509 | } |
510 | |
511 | /*----- Connection handling -----------------------------------------------*/ |
512 | |
513 | /* --- @a_destroy@ --- * |
514 | * |
515 | * Arguments: @admin *a@ = pointer to an admin block |
516 | * |
517 | * Returns: --- |
518 | * |
519 | * Use: Destroys an admin block. |
520 | */ |
521 | |
522 | static void a_destroy(admin *a) |
523 | { |
524 | T( trace(T_ADMIN, "admin: destroying connection %u", a->seq); ) |
525 | selbuf_destroy(&a->b); |
526 | if (a->b.reader.fd != a->fd) |
527 | close(a->b.reader.fd); |
528 | close(a->fd); |
529 | if (a->pname) { |
530 | xfree(a->pname); |
531 | xfree(a->paddr); |
532 | bres_abort(&a->r); |
533 | sel_rmtimer(&a->t); |
534 | } |
535 | if (a->next) |
536 | a->next->prev = a->prev; |
537 | if (a->prev) |
538 | a->prev->next = a->next; |
539 | else |
540 | admins = a->next; |
541 | if (a_stdin == a) |
542 | a_stdin = 0; |
543 | DESTROY(a); |
544 | } |
545 | |
546 | /* --- @a_line@ --- * |
547 | * |
548 | * Arguments: @char *p@ = pointer to the line read |
549 | * @void *vp@ = pointer to my admin block |
550 | * |
551 | * Returns: --- |
552 | * |
553 | * Use: Handles a line of input. |
554 | */ |
555 | |
556 | static void a_line(char *p, void *vp) |
557 | { |
558 | admin *a = vp; |
559 | const acmd *c; |
560 | char *av[4]; |
561 | size_t ac; |
562 | |
8d0c7a83 |
563 | TIMER; |
410c8acf |
564 | if (!p) { |
565 | a_destroy(a); |
566 | return; |
567 | } |
568 | ac = str_qsplit(p, av, 4, 0, STRF_QUOTE); |
569 | if (!ac) |
570 | return; |
571 | for (p = av[0]; *p; p++) *p = tolower((unsigned char)*p); |
572 | for (c = acmdtab; c->name; c++) { |
573 | if (strcmp(av[0], c->name) == 0) { |
574 | ac--; |
575 | if (c->argmin > ac || ac > c->argmax) |
576 | a_write(a, "ERR syntax: %s\n", c->help); |
577 | else |
578 | c->func(a, ac, av + 1); |
579 | return; |
580 | } |
581 | } |
582 | a_write(a, "ERR unknown command `%s'\n", av[0]); |
583 | } |
584 | |
585 | /* --- @a_create@ --- * |
586 | * |
587 | * Arguments: @int fd_in, fd_out@ = file descriptors to use |
588 | * |
589 | * Returns: --- |
590 | * |
591 | * Use: Creates a new admin connection. |
592 | */ |
593 | |
594 | void a_create(int fd_in, int fd_out) |
595 | { |
596 | admin *a = CREATE(admin); |
93bee2c4 |
597 | T( static unsigned seq = 0; |
598 | a->seq = seq++; ) |
410c8acf |
599 | T( trace(T_ADMIN, "admin: accepted connection %u", a->seq); ) |
600 | a->pname = 0; |
601 | if (fd_in == STDIN_FILENO) |
602 | a_stdin = a; |
603 | fdflags(fd_in, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
604 | if (fd_out != fd_in) |
605 | fdflags(fd_out, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
606 | a->fd = fd_out; |
607 | selbuf_init(&a->b, &sel, fd_in, a_line, a); |
608 | a->next = admins; |
609 | a->prev = 0; |
610 | if (admins) |
611 | admins->prev = a; |
612 | admins = a; |
613 | } |
614 | |
615 | /* --- @a_accept@ --- * |
616 | * |
617 | * Arguments: @int fd@ = file descriptor to accept |
618 | * @unsigned mode@ = what to do |
619 | * @void *v@ = uninteresting pointer |
620 | * |
621 | * Returns: --- |
622 | * |
623 | * Use: Accepts a new admin connection. |
624 | */ |
625 | |
626 | static void a_accept(int fd, unsigned mode, void *v) |
627 | { |
628 | int nfd; |
629 | struct sockaddr_un sun; |
630 | size_t sz = sizeof(sun); |
631 | |
632 | if ((nfd = accept(fd, (struct sockaddr *)&sun, &sz)) < 0) { |
633 | a_warn("accept admin connection failed: %s", strerror(errno)); |
634 | return; |
635 | } |
636 | a_create(nfd, nfd); |
637 | } |
638 | |
639 | /* --- @a_daemon@ --- * |
640 | * |
641 | * Arguments: --- |
642 | * |
643 | * Returns: --- |
644 | * |
645 | * Use: Informs the admin module that it's a daemon. |
646 | */ |
647 | |
648 | void a_daemon(void) |
649 | { |
650 | flags |= F_DAEMON; |
651 | } |
652 | |
653 | /* --- @a_init@ --- * |
654 | * |
655 | * Arguments: @const char *name@ = socket name to create |
656 | * |
657 | * Returns: --- |
658 | * |
659 | * Use: Creates the admin listening socket. |
660 | */ |
661 | |
662 | void a_init(const char *name) |
663 | { |
664 | int fd; |
665 | int n = 5; |
666 | struct sockaddr_un sun; |
667 | struct sigaction sa; |
668 | size_t sz; |
669 | |
670 | /* --- Set up the socket address --- */ |
671 | |
672 | sz = strlen(name) + 1; |
673 | if (sz > sizeof(sun.sun_path)) |
674 | die(EXIT_FAILURE, "socket name `%s' too long", name); |
675 | BURN(sun); |
676 | sun.sun_family = AF_UNIX; |
677 | memcpy(sun.sun_path, name, sz); |
678 | sz += offsetof(struct sockaddr_un, sun_path); |
679 | |
680 | /* --- Attempt to bind to the socket --- */ |
681 | |
682 | umask(0077); |
683 | again: |
684 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
685 | die(EXIT_FAILURE, "couldn't create socket: %s", strerror(errno)); |
686 | if (bind(fd, (struct sockaddr *)&sun, sz) < 0) { |
687 | struct stat st; |
688 | int e = errno; |
689 | if (errno != EADDRINUSE) { |
690 | die(EXIT_FAILURE, "couldn't bind to address `%s': %s", |
691 | sun.sun_path, strerror(e)); |
692 | } |
693 | if (!n) |
694 | die(EXIT_FAILURE, "too many retries; giving up"); |
695 | n--; |
696 | if (!connect(fd, (struct sockaddr *)&sun, sz)) { |
697 | die(EXIT_FAILURE, "server already listening on admin socket `%s'", |
698 | sun.sun_path); |
699 | } |
700 | if (errno != ECONNREFUSED) |
701 | die(EXIT_FAILURE, "couldn't bind to address: %s", strerror(e)); |
702 | if (stat(sun.sun_path, &st)) { |
703 | die(EXIT_FAILURE, "couldn't stat `%s': %s", |
704 | sun.sun_path, strerror(errno)); |
705 | } |
706 | if (!S_ISSOCK(st.st_mode)) |
707 | die(EXIT_FAILURE, "object `%s' isn't a socket", sun.sun_path); |
708 | T( trace(T_ADMIN, "stale socket found; removing it"); ) |
709 | unlink(sun.sun_path); |
710 | close(fd); |
711 | goto again; |
712 | } |
713 | chmod(sun.sun_path, 0600); |
714 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
715 | if (listen(fd, 5)) |
716 | die(EXIT_FAILURE, "couldn't listen on socket: %s", strerror(errno)); |
717 | |
718 | /* --- Listen to the socket --- */ |
719 | |
720 | sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0); |
721 | sel_addfile(&sock); |
722 | sockname = name; |
723 | bres_init(&sel); |
724 | T( trace_custom(a_trace, 0); |
725 | trace(T_ADMIN, "admin: enabled custom tracing"); ) |
726 | flags |= F_INIT; |
727 | |
728 | /* --- Set up signal handlers --- */ |
729 | |
730 | sig_add(&s_term, SIGTERM, a_sigdie, 0); |
731 | sig_add(&s_hup, SIGHUP, a_sighup, 0); |
732 | sigaction(SIGINT, 0, &sa); |
733 | if (sa.sa_handler != SIG_IGN) |
734 | sig_add(&s_int, SIGINT, a_sigdie, 0); |
735 | } |
736 | |
737 | /*----- That's all, folks -------------------------------------------------*/ |