410c8acf |
1 | /* -*-c-*- |
2 | * |
c7053da9 |
3 | * $Id: admin.c,v 1.5 2001/02/16 21:22:51 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 $ |
c7053da9 |
32 | * Revision 1.5 2001/02/16 21:22:51 mdw |
33 | * Support for displaying statistics. Make client connections blocking, so |
34 | * that things don't get dropped. (This might change again if I add |
35 | * buffering.) |
36 | * |
7fadfa0d |
37 | * Revision 1.4 2001/02/06 09:34:53 mdw |
38 | * Change ERR response to FAIL for consistency with other programs. |
39 | * |
93bee2c4 |
40 | * Revision 1.3 2001/02/04 01:17:12 mdw |
41 | * The `DAEMON' notification to stdout is replaced by a warning. The |
42 | * `DAEMON' and `QUIT' command send `OK' on successful completion. Put |
43 | * assignment of sequence number in a T(...) guard. |
44 | * |
8d0c7a83 |
45 | * Revision 1.2 2001/02/03 22:40:29 mdw |
46 | * Put timer information into the entropy pool when packets are received |
47 | * and on similar events. Reseed the generator on the interval timer. |
48 | * |
410c8acf |
49 | * Revision 1.1 2001/02/03 20:26:37 mdw |
50 | * Initial checkin. |
51 | * |
52 | */ |
53 | |
54 | /*----- Header files ------------------------------------------------------*/ |
55 | |
56 | #include "tripe.h" |
57 | |
58 | /*----- Global variables --------------------------------------------------*/ |
59 | |
60 | #ifndef NTRACE |
61 | |
62 | const trace_opt tr_opts[] = { |
63 | { 't', T_TUNNEL, "tunnel events" }, |
64 | { 'r', T_PEER, "peer events" }, |
65 | { 'a', T_ADMIN, "admin interface" }, |
66 | { 'p', T_PACKET, "packet contents" }, |
67 | { 'c', T_CRYPTO, "crypto details" }, |
68 | { 's', T_KEYSET, "symmetric keyset management" }, |
69 | { 'x', T_KEYEXCH, "key exchange" }, |
70 | { 'm', T_KEYMGMT, "key management" }, |
71 | { 'A', T_ALL, "all of the above" }, |
72 | { 0, 0, 0 } |
73 | }; |
74 | |
75 | unsigned tr_flags = 0; |
76 | #endif |
77 | |
78 | /*----- Static variables --------------------------------------------------*/ |
79 | |
80 | static admin *admins; |
81 | static sel_file sock; |
82 | static const char *sockname; |
83 | static unsigned flags = 0; |
84 | static admin *a_stdin = 0; |
85 | static sig s_term, s_int, s_hup; |
86 | |
87 | #define F_DAEMON 1u |
88 | #define F_INIT 2u |
89 | |
90 | #define T_RESOLVE SEC(30) |
91 | |
92 | /*----- Utility functions -------------------------------------------------*/ |
93 | |
94 | /* --- @a_write@ --- * |
95 | * |
96 | * Arguments: @admin *a@ = admin connection to write to |
97 | * @const char *fmt@ = pointer to format string |
98 | * @...@ = other arguments |
99 | * |
100 | * Returns: --- |
101 | * |
102 | * Use: Sends a message to an admin connection. |
103 | */ |
104 | |
105 | static void a_write(admin *a, const char *fmt, ...) |
106 | { |
107 | va_list ap; |
108 | dstr d = DSTR_INIT; |
109 | va_start(ap, fmt); |
110 | dstr_vputf(&d, fmt, ap); |
111 | va_end(ap); |
112 | write(a->fd, d.buf, d.len); |
113 | dstr_destroy(&d); |
114 | } |
115 | |
116 | /* --- @a_warn@ --- * |
117 | * |
118 | * Arguments: @const char *fmt@ = pointer to format string |
119 | * @...@ = other arguments |
120 | * |
121 | * Returns: --- |
122 | * |
123 | * Use: Informs all admin connections of a warning. |
124 | */ |
125 | |
126 | void a_warn(const char *fmt, ...) |
127 | { |
128 | va_list ap; |
129 | admin *a; |
130 | dstr d = DSTR_INIT; |
131 | |
132 | if (flags & F_INIT) |
133 | dstr_puts(&d, "WARN "); |
134 | va_start(ap, fmt); |
135 | dstr_vputf(&d, fmt, ap); |
136 | va_end(ap); |
137 | if (!(flags & F_INIT)) |
138 | moan("%s", d.buf); |
139 | else { |
140 | dstr_putc(&d, '\n'); |
141 | for (a = admins; a; a = a->next) |
142 | write(a->fd, d.buf, d.len); |
143 | } |
144 | dstr_destroy(&d); |
145 | } |
146 | |
147 | /* --- @a_trace@ --- * |
148 | * |
149 | * Arguments: @const char *p@ = pointer to a buffer |
150 | * @size_t sz@ = size of the buffer |
151 | * @void *v@ = uninteresting pointer |
152 | * |
153 | * Returns: --- |
154 | * |
155 | * Use: Custom trace output handler. |
156 | */ |
157 | |
158 | #ifndef NTRACE |
159 | static void a_trace(const char *p, size_t sz, void *v) |
160 | { |
161 | dstr d = DSTR_INIT; |
162 | admin *a; |
163 | |
164 | dstr_puts(&d, "TRACE "); |
165 | dstr_putm(&d, p, sz); |
166 | dstr_putc(&d, '\n'); |
167 | for (a = admins; a; a = a->next) |
168 | write(a->fd, d.buf, d.len); |
169 | dstr_destroy(&d); |
170 | } |
171 | #endif |
172 | |
173 | /* --- @a_quit@ --- * |
174 | * |
175 | * Arguments: --- |
176 | * |
177 | * Returns: --- |
178 | * |
179 | * Use: Shuts things down nicely. |
180 | */ |
181 | |
182 | void a_quit(void) |
183 | { |
184 | close(sock.fd); |
185 | unlink(sockname); |
186 | exit(0); |
187 | } |
188 | |
189 | /* --- @a_sigdie@ --- * |
190 | * |
191 | * Arguments: @int sig@ = signal number |
192 | * @void *v@ = an uninteresting argument |
193 | * |
194 | * Returns: --- |
195 | * |
196 | * Use Shuts down on receipt of a fatal signal. |
197 | */ |
198 | |
199 | static void a_sigdie(int sig, void *v) |
200 | { |
201 | char *p; |
202 | char buf[20]; |
203 | |
204 | switch (sig) { |
205 | case SIGTERM: p = "SIGTERM"; break; |
206 | case SIGINT: p = "SIGINT"; break; |
207 | default: |
208 | sprintf(buf, "signal %i", sig); |
209 | p = buf; |
210 | break; |
211 | } |
212 | a_warn("shutting down on %s", p); |
213 | a_quit(); |
214 | } |
215 | |
216 | /* --- @a_sighup@ --- * |
217 | * |
218 | * Arguments: @int sig@ = signal number |
219 | * @void *v@ = an uninteresting argument |
220 | * |
221 | * Returns: --- |
222 | * |
223 | * Use Logs a message about SIGHUP not being useful. |
224 | */ |
225 | |
226 | static void a_sighup(int sig, void *v) |
227 | { |
228 | a_warn("received SIGHUP: ignoring"); |
229 | } |
230 | |
231 | /*----- Adding peers ------------------------------------------------------*/ |
232 | |
233 | /* --- @a_resolve@ --- * |
234 | * |
235 | * Arguments: @struct hostent *h@ = pointer to resolved hostname |
236 | * @void *v@ = pointer to admin block |
237 | * |
238 | * Returns: --- |
239 | * |
240 | * Use: Handles a completed name resolution. |
241 | */ |
242 | |
243 | static void a_resolve(struct hostent *h, void *v) |
244 | { |
245 | admin *a = v; |
246 | T( trace(T_ADMIN, "admin: %u resolved", a->seq); ) |
8d0c7a83 |
247 | TIMER; |
410c8acf |
248 | sel_rmtimer(&a->t); |
249 | if (!h) |
7fadfa0d |
250 | a_write(a, "FAIL couldn't resolve hostname `%s'\n", a->paddr); |
410c8acf |
251 | else if (p_find(a->pname)) |
7fadfa0d |
252 | a_write(a, "FAIL peer `%s' already registered\n", a->pname); |
410c8acf |
253 | else { |
254 | memcpy(&a->peer.sin.sin_addr, h->h_addr, sizeof(struct in_addr)); |
255 | if (!p_create(a->pname, &a->peer.sa, a->sasz)) |
7fadfa0d |
256 | a_write(a, "FAIL couldn't create peer\n"); |
410c8acf |
257 | else |
258 | a_write(a, "OK\n"); |
259 | } |
260 | xfree(a->pname); |
261 | xfree(a->paddr); |
262 | a->pname = 0; |
263 | selbuf_enable(&a->b); |
264 | } |
265 | |
266 | /* --- @a_timer@ --- * |
267 | * |
268 | * Arguments: @struct timeval *tv@ = timer |
269 | * @void *v@ = pointer to admin block |
270 | * |
271 | * Returns: --- |
272 | * |
273 | * Use: Times out a resolver. |
274 | */ |
275 | |
276 | static void a_timer(struct timeval *tv, void *v) |
277 | { |
278 | admin *a = v; |
279 | T( trace(T_ADMIN, "admin: %u resolver timeout", a->seq); ) |
280 | bres_abort(&a->r); |
7fadfa0d |
281 | a_write(a, "FAIL timeout resolving `%s'\n", a->paddr); |
410c8acf |
282 | xfree(a->pname); |
283 | xfree(a->paddr); |
284 | a->pname = 0; |
285 | selbuf_enable(&a->b); |
286 | } |
287 | |
288 | /* --- @acmd_add@ --- * |
289 | * |
290 | * Arguments: @admin *a@ = connection which requested the addition |
291 | * @unsigned ac@ = argument count |
292 | * @char *av[]@ = pointer to the argument list |
293 | * |
294 | * Returns: --- |
295 | * |
296 | * Use: Adds a new peer. |
297 | */ |
298 | |
299 | static void acmd_add(admin *a, unsigned ac, char *av[]) |
300 | { |
301 | unsigned long pt; |
302 | struct timeval tv; |
303 | char *p; |
304 | |
305 | /* --- Make sure someone's not got there already --- */ |
306 | |
307 | if (p_find(av[0])) { |
7fadfa0d |
308 | a_write(a, "FAIL peer `%s' already registered\n", av[0]); |
410c8acf |
309 | return; |
310 | } |
311 | |
312 | /* --- Fill in the easy bits of address --- */ |
313 | |
314 | BURN(a->peer); |
315 | a->peer.sin.sin_family = AF_INET; |
316 | a->sasz = sizeof(a->peer.sin); |
317 | pt = strtoul(av[2], &p, 0); |
318 | if (*p) { |
319 | struct servent *s = getservbyname(av[2], "udp"); |
320 | if (!s) { |
7fadfa0d |
321 | a_write(a, "FAIL service `%s' not known\n", av[2]); |
410c8acf |
322 | return; |
323 | } |
324 | pt = ntohs(s->s_port); |
325 | } |
326 | if (pt == 0 || pt >= 65536) { |
7fadfa0d |
327 | a_write(a, "FAIL bad port number %lu\n", pt); |
410c8acf |
328 | return; |
329 | } |
330 | a->peer.sin.sin_port = htons(pt); |
331 | |
332 | /* --- If the name is numeric, do it the easy way --- */ |
333 | |
334 | if (inet_aton(av[1], &a->peer.sin.sin_addr)) { |
335 | if (!p_create(av[0], &a->peer.sa, a->sasz)) |
7fadfa0d |
336 | a_write(a, "FAIL couldn't create peer\n"); |
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337 | else |
338 | a_write(a, "OK\n"); |
339 | return; |
340 | } |
341 | |
342 | /* --- Store everything for later and crank up the resolver --- * |
343 | * |
344 | * We disable the line buffer until the resolver completes (or times out). |
345 | * This prevents other commands on the same connection (though the rest of |
346 | * the system continues regardless), but makes life simpler for the client. |
347 | */ |
348 | |
349 | a->pname = xstrdup(av[0]); |
350 | a->paddr = xstrdup(av[1]); |
351 | selbuf_disable(&a->b); |
352 | gettimeofday(&tv, 0); |
353 | tv.tv_sec += T_RESOLVE; |
354 | sel_addtimer(&sel, &a->t, &tv, a_timer, a); |
355 | bres_byname(&a->r, a->paddr, a_resolve, a); |
356 | T( trace(T_ADMIN, "admin: %u resolving hostname `%s'", |
357 | a->seq, a->paddr); ) |
358 | } |
359 | |
360 | /*----- Administration commands -------------------------------------------*/ |
361 | |
362 | /* --- Miscellaneous commands --- */ |
363 | |
364 | #ifndef NTRACE |
365 | |
366 | static void acmd_trace(admin *a, unsigned ac, char *av[]) |
367 | { |
368 | if (!ac || strcmp(av[0], "?") == 0) { |
369 | const trace_opt *t; |
370 | a_write(a, "INFO Trace options:\n"); |
371 | for (t = tr_opts; t->ch; t++) { |
372 | a_write(a, "INFO %c %c %s\n", |
373 | t->ch, (tr_flags & t->f) == t->f ? '*' : ' ', t->help); |
374 | } |
375 | } else { |
376 | unsigned sense = 1; |
377 | unsigned f = tr_flags; |
378 | const trace_opt *tt; |
379 | char *p = av[0]; |
380 | |
381 | while (*p) { |
382 | switch (*p) { |
383 | case '+': sense = 1; break; |
384 | case '-': sense = 0; break; |
385 | default: |
386 | for (tt = tr_opts; tt->ch; tt++) { |
387 | if (tt->ch == *p) { |
388 | if (sense) f |= tt->f; |
389 | else f &= ~tt->f; |
390 | goto tropt_ok; |
391 | } |
392 | } |
7fadfa0d |
393 | a_write(a, "FAIL unknown trace option `%c'\n", *p); |
410c8acf |
394 | return; |
395 | tropt_ok:; |
396 | break; |
397 | } |
398 | p++; |
399 | } |
400 | tr_flags = f; |
401 | trace_level(tr_flags); |
402 | } |
403 | a_write(a, "OK\n"); |
404 | } |
405 | |
406 | #endif |
407 | |
408 | static void acmd_port(admin *a, unsigned ac, char *av[]) |
409 | { |
410 | a_write(a, "INFO %u\nOK\n", p_port()); |
411 | } |
412 | |
413 | static void a_destroy(admin */*a*/); |
414 | |
415 | static void acmd_daemon(admin *a, unsigned ac, char *av[]) |
416 | { |
417 | if (flags & F_DAEMON) |
7fadfa0d |
418 | a_write(a, "FAIL already running as a daemon\n"); |
410c8acf |
419 | else { |
93bee2c4 |
420 | a_warn("becoming a daemon"); |
421 | if (a_stdin) |
410c8acf |
422 | a_destroy(a_stdin); |
410c8acf |
423 | if (u_daemon()) |
7fadfa0d |
424 | a_write(a, "FAIL error becoming a daemon: %s", strerror(errno)); |
93bee2c4 |
425 | else { |
410c8acf |
426 | flags |= F_DAEMON; |
93bee2c4 |
427 | a_write(a, "OK\n"); |
428 | } |
410c8acf |
429 | } |
430 | } |
431 | |
432 | static void acmd_list(admin *a, unsigned ac, char *av[]) |
433 | { |
434 | peer *p; |
435 | for (p = p_first(); p; p = p_next(p)) |
436 | a_write(a, "INFO %s\n", p_name(p)); |
437 | a_write(a, "OK\n"); |
438 | } |
439 | |
440 | static void acmd_ifname(admin *a, unsigned ac, char *av[]) |
441 | { |
442 | peer *p; |
443 | |
444 | if ((p = p_find(av[0])) == 0) |
7fadfa0d |
445 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
410c8acf |
446 | else |
447 | a_write(a, "INFO %s\nOK\n", p_ifname(p)); |
448 | } |
449 | |
450 | static void acmd_addr(admin *a, unsigned ac, char *av[]) |
451 | { |
452 | peer *p; |
453 | const addr *ad; |
454 | |
455 | if ((p = p_find(av[0])) == 0) |
7fadfa0d |
456 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
410c8acf |
457 | else { |
458 | ad = p_addr(p); |
459 | assert(ad->sa.sa_family == AF_INET); |
460 | a_write(a, "INFO %s %u\nOK\n", |
461 | inet_ntoa(ad->sin.sin_addr), |
462 | (unsigned)ntohs(ad->sin.sin_port)); |
463 | } |
464 | } |
465 | |
c7053da9 |
466 | static void acmd_stats(admin *a, unsigned ac, char *av[]) |
467 | { |
468 | peer *p; |
469 | stats *st; |
470 | |
471 | if ((p = p_find(av[0])) == 0) |
472 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
473 | else { |
474 | st = p_stats(p); |
475 | a_write(a, "INFO start-time=%s\n", timestr(st->t_start)); |
476 | a_write(a, "INFO last-packet-time=%s\n", timestr(st->t_last)); |
477 | a_write(a, "INFO packets-in=%lu bytes-in=%lu\n", st->n_in, st->sz_in); |
478 | a_write(a, "INFO packets-out=%lu bytes-out=%lu\n", |
479 | st->n_out, st->sz_out); |
480 | a_write(a, "INFO keyexch-packets-in=%lu keyexch-bytes-in=%lu\n", |
481 | st->n_kxin, st->sz_kxin); |
482 | a_write(a, "INFO keyexch-packets-out=%lu keyexch-bytes-out=%lu\n", |
483 | st->n_kxout, st->sz_kxout); |
484 | a_write(a, "INFO ip-packets-in=%lu ip-bytes-in=%lu\n", |
485 | st->n_ipin, st->sz_ipin); |
486 | a_write(a, "INFO ip-packets-out=%lu ip-bytes-out=%lu\n", |
487 | st->n_ipout, st->sz_ipout); |
488 | a_write(a, "INFO rejected-packets=%lu\n", st->n_reject); |
489 | a_write(a, "OK\n"); |
490 | } |
491 | } |
492 | |
410c8acf |
493 | static void acmd_kill(admin *a, unsigned ac, char *av[]) |
494 | { |
495 | peer *p; |
496 | if ((p = p_find(av[0])) == 0) |
7fadfa0d |
497 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
410c8acf |
498 | else { |
499 | p_destroy(p); |
500 | a_write(a, "OK\n"); |
501 | } |
502 | } |
503 | |
504 | static void acmd_quit(admin *a, unsigned ac, char *av[]) |
505 | { |
506 | a_warn("closing down on admin request"); |
93bee2c4 |
507 | a_write(a, "OK\n"); |
410c8acf |
508 | a_quit(); |
509 | } |
510 | |
511 | /* --- The command table and help --- */ |
512 | |
513 | typedef struct acmd { |
514 | const char *name; |
515 | const char *help; |
516 | unsigned argmin, argmax; |
517 | void (*func)(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
518 | } acmd; |
519 | |
520 | static void acmd_help(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
521 | |
522 | static const acmd acmdtab[] = { |
523 | { "help", "HELP", 0, 0, acmd_help }, |
524 | #ifndef NTRACE |
525 | { "trace", "TRACE [options]", 0, 1, acmd_trace }, |
526 | #endif |
527 | { "port", "PORT", 0, 0, acmd_port }, |
528 | { "daemon", "DAEMON", 0, 0, acmd_daemon }, |
529 | { "list", "LIST", 0, 0, acmd_list }, |
530 | { "ifname", "IFNAME peer", 1, 1, acmd_ifname }, |
531 | { "addr", "ADDR peer", 1, 1, acmd_addr }, |
c7053da9 |
532 | { "stats", "STATS peer", 1, 1, acmd_stats }, |
410c8acf |
533 | { "kill", "KILL peer", 1, 1, acmd_kill }, |
534 | { "add", "ADD peer addr port", 3, 3, acmd_add }, |
535 | { "quit", "QUIT", 0, 0, acmd_quit }, |
536 | { 0, 0, 0, 0, 0 } |
537 | }; |
538 | |
539 | static void acmd_help(admin *a, unsigned ac, char *av[]) |
540 | { |
541 | const acmd *c; |
542 | for (c = acmdtab; c->name; c++) |
543 | a_write(a, "INFO %s\n", c->help); |
544 | a_write(a, "OK\n"); |
545 | } |
546 | |
547 | /*----- Connection handling -----------------------------------------------*/ |
548 | |
549 | /* --- @a_destroy@ --- * |
550 | * |
551 | * Arguments: @admin *a@ = pointer to an admin block |
552 | * |
553 | * Returns: --- |
554 | * |
555 | * Use: Destroys an admin block. |
556 | */ |
557 | |
558 | static void a_destroy(admin *a) |
559 | { |
560 | T( trace(T_ADMIN, "admin: destroying connection %u", a->seq); ) |
561 | selbuf_destroy(&a->b); |
562 | if (a->b.reader.fd != a->fd) |
563 | close(a->b.reader.fd); |
564 | close(a->fd); |
565 | if (a->pname) { |
566 | xfree(a->pname); |
567 | xfree(a->paddr); |
568 | bres_abort(&a->r); |
569 | sel_rmtimer(&a->t); |
570 | } |
571 | if (a->next) |
572 | a->next->prev = a->prev; |
573 | if (a->prev) |
574 | a->prev->next = a->next; |
575 | else |
576 | admins = a->next; |
577 | if (a_stdin == a) |
578 | a_stdin = 0; |
579 | DESTROY(a); |
580 | } |
581 | |
582 | /* --- @a_line@ --- * |
583 | * |
584 | * Arguments: @char *p@ = pointer to the line read |
585 | * @void *vp@ = pointer to my admin block |
586 | * |
587 | * Returns: --- |
588 | * |
589 | * Use: Handles a line of input. |
590 | */ |
591 | |
592 | static void a_line(char *p, void *vp) |
593 | { |
594 | admin *a = vp; |
595 | const acmd *c; |
596 | char *av[4]; |
597 | size_t ac; |
598 | |
8d0c7a83 |
599 | TIMER; |
410c8acf |
600 | if (!p) { |
601 | a_destroy(a); |
602 | return; |
603 | } |
604 | ac = str_qsplit(p, av, 4, 0, STRF_QUOTE); |
605 | if (!ac) |
606 | return; |
607 | for (p = av[0]; *p; p++) *p = tolower((unsigned char)*p); |
608 | for (c = acmdtab; c->name; c++) { |
609 | if (strcmp(av[0], c->name) == 0) { |
610 | ac--; |
611 | if (c->argmin > ac || ac > c->argmax) |
7fadfa0d |
612 | a_write(a, "FAIL syntax: %s\n", c->help); |
410c8acf |
613 | else |
614 | c->func(a, ac, av + 1); |
615 | return; |
616 | } |
617 | } |
7fadfa0d |
618 | a_write(a, "FAIL unknown command `%s'\n", av[0]); |
410c8acf |
619 | } |
620 | |
621 | /* --- @a_create@ --- * |
622 | * |
623 | * Arguments: @int fd_in, fd_out@ = file descriptors to use |
624 | * |
625 | * Returns: --- |
626 | * |
627 | * Use: Creates a new admin connection. |
628 | */ |
629 | |
630 | void a_create(int fd_in, int fd_out) |
631 | { |
632 | admin *a = CREATE(admin); |
93bee2c4 |
633 | T( static unsigned seq = 0; |
634 | a->seq = seq++; ) |
410c8acf |
635 | T( trace(T_ADMIN, "admin: accepted connection %u", a->seq); ) |
636 | a->pname = 0; |
637 | if (fd_in == STDIN_FILENO) |
638 | a_stdin = a; |
c7053da9 |
639 | fdflags(fd_in, O_NONBLOCK, 0, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf |
640 | if (fd_out != fd_in) |
c7053da9 |
641 | fdflags(fd_out, O_NONBLOCK, 0, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf |
642 | a->fd = fd_out; |
643 | selbuf_init(&a->b, &sel, fd_in, a_line, a); |
644 | a->next = admins; |
645 | a->prev = 0; |
646 | if (admins) |
647 | admins->prev = a; |
648 | admins = a; |
649 | } |
650 | |
651 | /* --- @a_accept@ --- * |
652 | * |
653 | * Arguments: @int fd@ = file descriptor to accept |
654 | * @unsigned mode@ = what to do |
655 | * @void *v@ = uninteresting pointer |
656 | * |
657 | * Returns: --- |
658 | * |
659 | * Use: Accepts a new admin connection. |
660 | */ |
661 | |
662 | static void a_accept(int fd, unsigned mode, void *v) |
663 | { |
664 | int nfd; |
665 | struct sockaddr_un sun; |
666 | size_t sz = sizeof(sun); |
667 | |
668 | if ((nfd = accept(fd, (struct sockaddr *)&sun, &sz)) < 0) { |
669 | a_warn("accept admin connection failed: %s", strerror(errno)); |
670 | return; |
671 | } |
672 | a_create(nfd, nfd); |
673 | } |
674 | |
675 | /* --- @a_daemon@ --- * |
676 | * |
677 | * Arguments: --- |
678 | * |
679 | * Returns: --- |
680 | * |
681 | * Use: Informs the admin module that it's a daemon. |
682 | */ |
683 | |
684 | void a_daemon(void) |
685 | { |
686 | flags |= F_DAEMON; |
687 | } |
688 | |
689 | /* --- @a_init@ --- * |
690 | * |
691 | * Arguments: @const char *name@ = socket name to create |
692 | * |
693 | * Returns: --- |
694 | * |
695 | * Use: Creates the admin listening socket. |
696 | */ |
697 | |
698 | void a_init(const char *name) |
699 | { |
700 | int fd; |
701 | int n = 5; |
702 | struct sockaddr_un sun; |
703 | struct sigaction sa; |
704 | size_t sz; |
705 | |
706 | /* --- Set up the socket address --- */ |
707 | |
708 | sz = strlen(name) + 1; |
709 | if (sz > sizeof(sun.sun_path)) |
710 | die(EXIT_FAILURE, "socket name `%s' too long", name); |
711 | BURN(sun); |
712 | sun.sun_family = AF_UNIX; |
713 | memcpy(sun.sun_path, name, sz); |
714 | sz += offsetof(struct sockaddr_un, sun_path); |
715 | |
716 | /* --- Attempt to bind to the socket --- */ |
717 | |
718 | umask(0077); |
719 | again: |
720 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
721 | die(EXIT_FAILURE, "couldn't create socket: %s", strerror(errno)); |
722 | if (bind(fd, (struct sockaddr *)&sun, sz) < 0) { |
723 | struct stat st; |
724 | int e = errno; |
725 | if (errno != EADDRINUSE) { |
726 | die(EXIT_FAILURE, "couldn't bind to address `%s': %s", |
727 | sun.sun_path, strerror(e)); |
728 | } |
729 | if (!n) |
730 | die(EXIT_FAILURE, "too many retries; giving up"); |
731 | n--; |
732 | if (!connect(fd, (struct sockaddr *)&sun, sz)) { |
733 | die(EXIT_FAILURE, "server already listening on admin socket `%s'", |
734 | sun.sun_path); |
735 | } |
736 | if (errno != ECONNREFUSED) |
737 | die(EXIT_FAILURE, "couldn't bind to address: %s", strerror(e)); |
738 | if (stat(sun.sun_path, &st)) { |
739 | die(EXIT_FAILURE, "couldn't stat `%s': %s", |
740 | sun.sun_path, strerror(errno)); |
741 | } |
742 | if (!S_ISSOCK(st.st_mode)) |
743 | die(EXIT_FAILURE, "object `%s' isn't a socket", sun.sun_path); |
c7053da9 |
744 | T( trace(T_ADMIN, "admin: stale socket found; removing it"); ) |
410c8acf |
745 | unlink(sun.sun_path); |
746 | close(fd); |
747 | goto again; |
748 | } |
749 | chmod(sun.sun_path, 0600); |
750 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
751 | if (listen(fd, 5)) |
752 | die(EXIT_FAILURE, "couldn't listen on socket: %s", strerror(errno)); |
753 | |
754 | /* --- Listen to the socket --- */ |
755 | |
756 | sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0); |
757 | sel_addfile(&sock); |
758 | sockname = name; |
759 | bres_init(&sel); |
760 | T( trace_custom(a_trace, 0); |
761 | trace(T_ADMIN, "admin: enabled custom tracing"); ) |
762 | flags |= F_INIT; |
763 | |
764 | /* --- Set up signal handlers --- */ |
765 | |
766 | sig_add(&s_term, SIGTERM, a_sigdie, 0); |
767 | sig_add(&s_hup, SIGHUP, a_sighup, 0); |
768 | sigaction(SIGINT, 0, &sa); |
769 | if (sa.sa_handler != SIG_IGN) |
770 | sig_add(&s_int, SIGINT, a_sigdie, 0); |
771 | } |
772 | |
773 | /*----- That's all, folks -------------------------------------------------*/ |