410c8acf |
1 | /* -*-c-*- |
2 | * |
fd3cf232 |
3 | * $Id: admin.c,v 1.6 2001/02/19 19:11:09 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 $ |
fd3cf232 |
32 | * Revision 1.6 2001/02/19 19:11:09 mdw |
33 | * Output buffering on admin connections. |
34 | * |
c7053da9 |
35 | * Revision 1.5 2001/02/16 21:22:51 mdw |
36 | * Support for displaying statistics. Make client connections blocking, so |
37 | * that things don't get dropped. (This might change again if I add |
38 | * buffering.) |
39 | * |
7fadfa0d |
40 | * Revision 1.4 2001/02/06 09:34:53 mdw |
41 | * Change ERR response to FAIL for consistency with other programs. |
42 | * |
93bee2c4 |
43 | * Revision 1.3 2001/02/04 01:17:12 mdw |
44 | * The `DAEMON' notification to stdout is replaced by a warning. The |
45 | * `DAEMON' and `QUIT' command send `OK' on successful completion. Put |
46 | * assignment of sequence number in a T(...) guard. |
47 | * |
8d0c7a83 |
48 | * Revision 1.2 2001/02/03 22:40:29 mdw |
49 | * Put timer information into the entropy pool when packets are received |
50 | * and on similar events. Reseed the generator on the interval timer. |
51 | * |
410c8acf |
52 | * Revision 1.1 2001/02/03 20:26:37 mdw |
53 | * Initial checkin. |
54 | * |
55 | */ |
56 | |
57 | /*----- Header files ------------------------------------------------------*/ |
58 | |
59 | #include "tripe.h" |
60 | |
61 | /*----- Global variables --------------------------------------------------*/ |
62 | |
63 | #ifndef NTRACE |
64 | |
65 | const trace_opt tr_opts[] = { |
66 | { 't', T_TUNNEL, "tunnel events" }, |
67 | { 'r', T_PEER, "peer events" }, |
68 | { 'a', T_ADMIN, "admin interface" }, |
69 | { 'p', T_PACKET, "packet contents" }, |
70 | { 'c', T_CRYPTO, "crypto details" }, |
71 | { 's', T_KEYSET, "symmetric keyset management" }, |
72 | { 'x', T_KEYEXCH, "key exchange" }, |
73 | { 'm', T_KEYMGMT, "key management" }, |
74 | { 'A', T_ALL, "all of the above" }, |
75 | { 0, 0, 0 } |
76 | }; |
77 | |
78 | unsigned tr_flags = 0; |
79 | #endif |
80 | |
81 | /*----- Static variables --------------------------------------------------*/ |
82 | |
83 | static admin *admins; |
84 | static sel_file sock; |
85 | static const char *sockname; |
86 | static unsigned flags = 0; |
87 | static admin *a_stdin = 0; |
88 | static sig s_term, s_int, s_hup; |
89 | |
90 | #define F_DAEMON 1u |
91 | #define F_INIT 2u |
92 | |
93 | #define T_RESOLVE SEC(30) |
94 | |
fd3cf232 |
95 | static void a_destroy(admin */*a*/); |
96 | static void a_lock(admin */*a*/); |
97 | static void a_unlock(admin */*a*/); |
98 | |
99 | /*----- Output functions --------------------------------------------------*/ |
100 | |
101 | /* --- @trywrite@ --- * |
102 | * |
103 | * Arguments: @admin *a@ = pointer to an admin block |
104 | * @const char *p@ = pointer to buffer to write |
105 | * @size_t sz@ = size of data to write |
106 | * |
107 | * Returns: The number of bytes written, or less than zero on error. |
108 | * |
109 | * Use: Attempts to write data to a client. |
110 | */ |
111 | |
112 | static ssize_t trywrite(admin *a, const char *p, size_t sz) |
113 | { |
114 | ssize_t n, done = 0; |
115 | |
116 | again: |
117 | if (!sz) |
118 | return (done); |
119 | n = write(a->w.fd, p, sz); |
120 | if (n > 0) { |
121 | done += n; |
122 | p += n; |
123 | sz -= n; |
124 | goto again; |
125 | } |
126 | if (n < 0) { |
127 | if (errno == EINTR) |
128 | goto again; |
129 | if (errno != EAGAIN && errno != EWOULDBLOCK) { |
130 | a_destroy(a); |
131 | a_warn("disconnecting admin client due to write errors: %s", |
132 | strerror(errno)); |
133 | return (-1); |
134 | } |
135 | } |
136 | return (done); |
137 | } |
138 | |
139 | /* --- @dosend@ --- * |
140 | * |
141 | * Arguemnts: @admin *a@ = pointer to an admin block |
142 | * @const char *p@ = pointer to buffer to write |
143 | * @size_t sz@ = size of data to write |
144 | * |
145 | * Returns: --- |
146 | * |
147 | * Use: Sends data to an admin client. |
148 | */ |
149 | |
150 | static void dosend(admin *a, const char *p, size_t sz) |
151 | { |
152 | ssize_t n; |
153 | obuf *o; |
154 | |
155 | if (a->f & AF_DEAD) |
156 | return; |
157 | |
158 | /* --- Try to send the data immediately --- */ |
159 | |
160 | if (!a->o_head) { |
161 | if ((n = trywrite(a, p, sz)) < 0) |
162 | return; |
163 | p += n; |
164 | sz -= n; |
165 | if (!sz) |
166 | return; |
167 | } |
168 | |
169 | /* --- Fill buffers with the data until it's all gone --- */ |
170 | |
171 | o = a->o_tail; |
172 | if (!o) |
173 | sel_addfile(&a->w); |
174 | else if (o->p_in < o->buf + OBUFSZ) |
175 | goto noalloc; |
176 | |
177 | do { |
178 | o = xmalloc(sizeof(obuf)); |
179 | o->next = 0; |
180 | o->p_in = o->p_out = o->buf; |
181 | if (a->o_tail) |
182 | a->o_tail->next = o; |
183 | else |
184 | a->o_head = o; |
185 | a->o_tail = o; |
186 | |
187 | noalloc: |
188 | n = o->buf + OBUFSZ - o->p_in; |
189 | if (n > sz) |
190 | n = sz; |
191 | memcpy(o->p_in, p, n); |
192 | o->p_in += n; |
193 | p += n; |
194 | sz -= n; |
195 | } while (sz); |
196 | } |
197 | |
198 | /* --- @a_flush@ --- * |
199 | * |
200 | * Arguments: @int fd@ = file descriptor |
201 | * @unsigned mode@ = what's happening |
202 | * @void *v@ = pointer to my admin block |
203 | * |
204 | * Returns: --- |
205 | * |
206 | * Use: Flushes buffers when a client is ready to read again. |
207 | */ |
208 | |
209 | static void a_flush(int fd, unsigned mode, void *v) |
210 | { |
211 | admin *a = v; |
212 | obuf *o, *oo; |
213 | ssize_t n; |
214 | |
215 | o = a->o_head; |
216 | while (o) { |
217 | if ((n = trywrite(a, o->p_out, o->p_in - o->p_out)) < 0) |
218 | return; |
219 | o->p_out += n; |
220 | if (o->p_in < o->p_out) |
221 | break; |
222 | oo = o; |
223 | o = o->next; |
224 | xfree(oo); |
225 | } |
226 | a->o_head = o; |
227 | if (!o) { |
228 | a->o_tail = 0; |
229 | sel_rmfile(&a->w); |
230 | } |
231 | } |
232 | |
410c8acf |
233 | /*----- Utility functions -------------------------------------------------*/ |
234 | |
235 | /* --- @a_write@ --- * |
236 | * |
237 | * Arguments: @admin *a@ = admin connection to write to |
238 | * @const char *fmt@ = pointer to format string |
239 | * @...@ = other arguments |
240 | * |
241 | * Returns: --- |
242 | * |
243 | * Use: Sends a message to an admin connection. |
244 | */ |
245 | |
246 | static void a_write(admin *a, const char *fmt, ...) |
247 | { |
248 | va_list ap; |
249 | dstr d = DSTR_INIT; |
250 | va_start(ap, fmt); |
251 | dstr_vputf(&d, fmt, ap); |
252 | va_end(ap); |
fd3cf232 |
253 | dosend(a, d.buf, d.len); |
410c8acf |
254 | dstr_destroy(&d); |
255 | } |
256 | |
257 | /* --- @a_warn@ --- * |
258 | * |
259 | * Arguments: @const char *fmt@ = pointer to format string |
260 | * @...@ = other arguments |
261 | * |
262 | * Returns: --- |
263 | * |
264 | * Use: Informs all admin connections of a warning. |
265 | */ |
266 | |
267 | void a_warn(const char *fmt, ...) |
268 | { |
269 | va_list ap; |
fd3cf232 |
270 | admin *a, *aa; |
410c8acf |
271 | dstr d = DSTR_INIT; |
272 | |
273 | if (flags & F_INIT) |
274 | dstr_puts(&d, "WARN "); |
275 | va_start(ap, fmt); |
276 | dstr_vputf(&d, fmt, ap); |
277 | va_end(ap); |
278 | if (!(flags & F_INIT)) |
279 | moan("%s", d.buf); |
280 | else { |
281 | dstr_putc(&d, '\n'); |
fd3cf232 |
282 | for (a = admins; a; a = aa) { |
283 | aa = a->next; |
284 | dosend(a, d.buf, d.len); |
285 | } |
410c8acf |
286 | } |
287 | dstr_destroy(&d); |
288 | } |
289 | |
290 | /* --- @a_trace@ --- * |
291 | * |
292 | * Arguments: @const char *p@ = pointer to a buffer |
293 | * @size_t sz@ = size of the buffer |
294 | * @void *v@ = uninteresting pointer |
295 | * |
296 | * Returns: --- |
297 | * |
298 | * Use: Custom trace output handler. |
299 | */ |
300 | |
301 | #ifndef NTRACE |
302 | static void a_trace(const char *p, size_t sz, void *v) |
303 | { |
304 | dstr d = DSTR_INIT; |
fd3cf232 |
305 | admin *a, *aa; |
410c8acf |
306 | |
307 | dstr_puts(&d, "TRACE "); |
308 | dstr_putm(&d, p, sz); |
309 | dstr_putc(&d, '\n'); |
fd3cf232 |
310 | for (a = admins; a; a = aa) { |
311 | aa = a->next; |
312 | dosend(a, d.buf, d.len); |
313 | } |
410c8acf |
314 | dstr_destroy(&d); |
315 | } |
316 | #endif |
317 | |
318 | /* --- @a_quit@ --- * |
319 | * |
320 | * Arguments: --- |
321 | * |
322 | * Returns: --- |
323 | * |
324 | * Use: Shuts things down nicely. |
325 | */ |
326 | |
327 | void a_quit(void) |
328 | { |
329 | close(sock.fd); |
330 | unlink(sockname); |
331 | exit(0); |
332 | } |
333 | |
334 | /* --- @a_sigdie@ --- * |
335 | * |
336 | * Arguments: @int sig@ = signal number |
337 | * @void *v@ = an uninteresting argument |
338 | * |
339 | * Returns: --- |
340 | * |
341 | * Use Shuts down on receipt of a fatal signal. |
342 | */ |
343 | |
344 | static void a_sigdie(int sig, void *v) |
345 | { |
346 | char *p; |
347 | char buf[20]; |
348 | |
349 | switch (sig) { |
350 | case SIGTERM: p = "SIGTERM"; break; |
351 | case SIGINT: p = "SIGINT"; break; |
352 | default: |
353 | sprintf(buf, "signal %i", sig); |
354 | p = buf; |
355 | break; |
356 | } |
357 | a_warn("shutting down on %s", p); |
358 | a_quit(); |
359 | } |
360 | |
361 | /* --- @a_sighup@ --- * |
362 | * |
363 | * Arguments: @int sig@ = signal number |
364 | * @void *v@ = an uninteresting argument |
365 | * |
366 | * Returns: --- |
367 | * |
368 | * Use Logs a message about SIGHUP not being useful. |
369 | */ |
370 | |
371 | static void a_sighup(int sig, void *v) |
372 | { |
373 | a_warn("received SIGHUP: ignoring"); |
374 | } |
375 | |
376 | /*----- Adding peers ------------------------------------------------------*/ |
377 | |
378 | /* --- @a_resolve@ --- * |
379 | * |
380 | * Arguments: @struct hostent *h@ = pointer to resolved hostname |
381 | * @void *v@ = pointer to admin block |
382 | * |
383 | * Returns: --- |
384 | * |
385 | * Use: Handles a completed name resolution. |
386 | */ |
387 | |
388 | static void a_resolve(struct hostent *h, void *v) |
389 | { |
390 | admin *a = v; |
fd3cf232 |
391 | |
392 | a_lock(a); |
410c8acf |
393 | T( trace(T_ADMIN, "admin: %u resolved", a->seq); ) |
8d0c7a83 |
394 | TIMER; |
410c8acf |
395 | sel_rmtimer(&a->t); |
396 | if (!h) |
7fadfa0d |
397 | a_write(a, "FAIL couldn't resolve hostname `%s'\n", a->paddr); |
410c8acf |
398 | else if (p_find(a->pname)) |
7fadfa0d |
399 | a_write(a, "FAIL peer `%s' already registered\n", a->pname); |
410c8acf |
400 | else { |
401 | memcpy(&a->peer.sin.sin_addr, h->h_addr, sizeof(struct in_addr)); |
402 | if (!p_create(a->pname, &a->peer.sa, a->sasz)) |
7fadfa0d |
403 | a_write(a, "FAIL couldn't create peer\n"); |
410c8acf |
404 | else |
405 | a_write(a, "OK\n"); |
406 | } |
407 | xfree(a->pname); |
408 | xfree(a->paddr); |
409 | a->pname = 0; |
410 | selbuf_enable(&a->b); |
fd3cf232 |
411 | a_unlock(a); |
410c8acf |
412 | } |
413 | |
414 | /* --- @a_timer@ --- * |
415 | * |
416 | * Arguments: @struct timeval *tv@ = timer |
417 | * @void *v@ = pointer to admin block |
418 | * |
419 | * Returns: --- |
420 | * |
421 | * Use: Times out a resolver. |
422 | */ |
423 | |
424 | static void a_timer(struct timeval *tv, void *v) |
425 | { |
426 | admin *a = v; |
fd3cf232 |
427 | |
428 | a_lock(a); |
410c8acf |
429 | T( trace(T_ADMIN, "admin: %u resolver timeout", a->seq); ) |
430 | bres_abort(&a->r); |
7fadfa0d |
431 | a_write(a, "FAIL timeout resolving `%s'\n", a->paddr); |
410c8acf |
432 | xfree(a->pname); |
433 | xfree(a->paddr); |
434 | a->pname = 0; |
435 | selbuf_enable(&a->b); |
fd3cf232 |
436 | a_unlock(a); |
410c8acf |
437 | } |
438 | |
439 | /* --- @acmd_add@ --- * |
440 | * |
441 | * Arguments: @admin *a@ = connection which requested the addition |
442 | * @unsigned ac@ = argument count |
443 | * @char *av[]@ = pointer to the argument list |
444 | * |
445 | * Returns: --- |
446 | * |
447 | * Use: Adds a new peer. |
448 | */ |
449 | |
450 | static void acmd_add(admin *a, unsigned ac, char *av[]) |
451 | { |
452 | unsigned long pt; |
453 | struct timeval tv; |
454 | char *p; |
455 | |
456 | /* --- Make sure someone's not got there already --- */ |
457 | |
458 | if (p_find(av[0])) { |
7fadfa0d |
459 | a_write(a, "FAIL peer `%s' already registered\n", av[0]); |
410c8acf |
460 | return; |
461 | } |
462 | |
463 | /* --- Fill in the easy bits of address --- */ |
464 | |
465 | BURN(a->peer); |
466 | a->peer.sin.sin_family = AF_INET; |
467 | a->sasz = sizeof(a->peer.sin); |
468 | pt = strtoul(av[2], &p, 0); |
469 | if (*p) { |
470 | struct servent *s = getservbyname(av[2], "udp"); |
471 | if (!s) { |
7fadfa0d |
472 | a_write(a, "FAIL service `%s' not known\n", av[2]); |
410c8acf |
473 | return; |
474 | } |
475 | pt = ntohs(s->s_port); |
476 | } |
477 | if (pt == 0 || pt >= 65536) { |
7fadfa0d |
478 | a_write(a, "FAIL bad port number %lu\n", pt); |
410c8acf |
479 | return; |
480 | } |
481 | a->peer.sin.sin_port = htons(pt); |
482 | |
483 | /* --- If the name is numeric, do it the easy way --- */ |
484 | |
485 | if (inet_aton(av[1], &a->peer.sin.sin_addr)) { |
486 | if (!p_create(av[0], &a->peer.sa, a->sasz)) |
7fadfa0d |
487 | a_write(a, "FAIL couldn't create peer\n"); |
410c8acf |
488 | else |
489 | a_write(a, "OK\n"); |
490 | return; |
491 | } |
492 | |
493 | /* --- Store everything for later and crank up the resolver --- * |
494 | * |
495 | * We disable the line buffer until the resolver completes (or times out). |
496 | * This prevents other commands on the same connection (though the rest of |
497 | * the system continues regardless), but makes life simpler for the client. |
498 | */ |
499 | |
500 | a->pname = xstrdup(av[0]); |
501 | a->paddr = xstrdup(av[1]); |
502 | selbuf_disable(&a->b); |
503 | gettimeofday(&tv, 0); |
504 | tv.tv_sec += T_RESOLVE; |
505 | sel_addtimer(&sel, &a->t, &tv, a_timer, a); |
506 | bres_byname(&a->r, a->paddr, a_resolve, a); |
507 | T( trace(T_ADMIN, "admin: %u resolving hostname `%s'", |
508 | a->seq, a->paddr); ) |
509 | } |
510 | |
511 | /*----- Administration commands -------------------------------------------*/ |
512 | |
513 | /* --- Miscellaneous commands --- */ |
514 | |
515 | #ifndef NTRACE |
516 | |
517 | static void acmd_trace(admin *a, unsigned ac, char *av[]) |
518 | { |
519 | if (!ac || strcmp(av[0], "?") == 0) { |
520 | const trace_opt *t; |
521 | a_write(a, "INFO Trace options:\n"); |
522 | for (t = tr_opts; t->ch; t++) { |
523 | a_write(a, "INFO %c %c %s\n", |
524 | t->ch, (tr_flags & t->f) == t->f ? '*' : ' ', t->help); |
525 | } |
526 | } else { |
527 | unsigned sense = 1; |
528 | unsigned f = tr_flags; |
529 | const trace_opt *tt; |
530 | char *p = av[0]; |
531 | |
532 | while (*p) { |
533 | switch (*p) { |
534 | case '+': sense = 1; break; |
535 | case '-': sense = 0; break; |
536 | default: |
537 | for (tt = tr_opts; tt->ch; tt++) { |
538 | if (tt->ch == *p) { |
539 | if (sense) f |= tt->f; |
540 | else f &= ~tt->f; |
541 | goto tropt_ok; |
542 | } |
543 | } |
7fadfa0d |
544 | a_write(a, "FAIL unknown trace option `%c'\n", *p); |
410c8acf |
545 | return; |
546 | tropt_ok:; |
547 | break; |
548 | } |
549 | p++; |
550 | } |
551 | tr_flags = f; |
552 | trace_level(tr_flags); |
553 | } |
554 | a_write(a, "OK\n"); |
555 | } |
556 | |
557 | #endif |
558 | |
559 | static void acmd_port(admin *a, unsigned ac, char *av[]) |
560 | { |
561 | a_write(a, "INFO %u\nOK\n", p_port()); |
562 | } |
563 | |
410c8acf |
564 | static void acmd_daemon(admin *a, unsigned ac, char *av[]) |
565 | { |
566 | if (flags & F_DAEMON) |
7fadfa0d |
567 | a_write(a, "FAIL already running as a daemon\n"); |
410c8acf |
568 | else { |
93bee2c4 |
569 | a_warn("becoming a daemon"); |
570 | if (a_stdin) |
410c8acf |
571 | a_destroy(a_stdin); |
410c8acf |
572 | if (u_daemon()) |
7fadfa0d |
573 | a_write(a, "FAIL error becoming a daemon: %s", strerror(errno)); |
93bee2c4 |
574 | else { |
410c8acf |
575 | flags |= F_DAEMON; |
93bee2c4 |
576 | a_write(a, "OK\n"); |
577 | } |
410c8acf |
578 | } |
579 | } |
580 | |
581 | static void acmd_list(admin *a, unsigned ac, char *av[]) |
582 | { |
583 | peer *p; |
584 | for (p = p_first(); p; p = p_next(p)) |
585 | a_write(a, "INFO %s\n", p_name(p)); |
586 | a_write(a, "OK\n"); |
587 | } |
588 | |
589 | static void acmd_ifname(admin *a, unsigned ac, char *av[]) |
590 | { |
591 | peer *p; |
592 | |
593 | if ((p = p_find(av[0])) == 0) |
7fadfa0d |
594 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
410c8acf |
595 | else |
596 | a_write(a, "INFO %s\nOK\n", p_ifname(p)); |
597 | } |
598 | |
599 | static void acmd_addr(admin *a, unsigned ac, char *av[]) |
600 | { |
601 | peer *p; |
602 | const addr *ad; |
603 | |
604 | if ((p = p_find(av[0])) == 0) |
7fadfa0d |
605 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
410c8acf |
606 | else { |
607 | ad = p_addr(p); |
608 | assert(ad->sa.sa_family == AF_INET); |
609 | a_write(a, "INFO %s %u\nOK\n", |
610 | inet_ntoa(ad->sin.sin_addr), |
611 | (unsigned)ntohs(ad->sin.sin_port)); |
612 | } |
613 | } |
614 | |
c7053da9 |
615 | static void acmd_stats(admin *a, unsigned ac, char *av[]) |
616 | { |
617 | peer *p; |
618 | stats *st; |
619 | |
620 | if ((p = p_find(av[0])) == 0) |
621 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
622 | else { |
623 | st = p_stats(p); |
624 | a_write(a, "INFO start-time=%s\n", timestr(st->t_start)); |
625 | a_write(a, "INFO last-packet-time=%s\n", timestr(st->t_last)); |
626 | a_write(a, "INFO packets-in=%lu bytes-in=%lu\n", st->n_in, st->sz_in); |
627 | a_write(a, "INFO packets-out=%lu bytes-out=%lu\n", |
628 | st->n_out, st->sz_out); |
629 | a_write(a, "INFO keyexch-packets-in=%lu keyexch-bytes-in=%lu\n", |
630 | st->n_kxin, st->sz_kxin); |
631 | a_write(a, "INFO keyexch-packets-out=%lu keyexch-bytes-out=%lu\n", |
632 | st->n_kxout, st->sz_kxout); |
633 | a_write(a, "INFO ip-packets-in=%lu ip-bytes-in=%lu\n", |
634 | st->n_ipin, st->sz_ipin); |
635 | a_write(a, "INFO ip-packets-out=%lu ip-bytes-out=%lu\n", |
636 | st->n_ipout, st->sz_ipout); |
637 | a_write(a, "INFO rejected-packets=%lu\n", st->n_reject); |
638 | a_write(a, "OK\n"); |
639 | } |
640 | } |
641 | |
410c8acf |
642 | static void acmd_kill(admin *a, unsigned ac, char *av[]) |
643 | { |
644 | peer *p; |
645 | if ((p = p_find(av[0])) == 0) |
7fadfa0d |
646 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
410c8acf |
647 | else { |
648 | p_destroy(p); |
649 | a_write(a, "OK\n"); |
650 | } |
651 | } |
652 | |
653 | static void acmd_quit(admin *a, unsigned ac, char *av[]) |
654 | { |
655 | a_warn("closing down on admin request"); |
93bee2c4 |
656 | a_write(a, "OK\n"); |
410c8acf |
657 | a_quit(); |
658 | } |
659 | |
660 | /* --- The command table and help --- */ |
661 | |
662 | typedef struct acmd { |
663 | const char *name; |
664 | const char *help; |
665 | unsigned argmin, argmax; |
666 | void (*func)(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
667 | } acmd; |
668 | |
669 | static void acmd_help(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
670 | |
671 | static const acmd acmdtab[] = { |
672 | { "help", "HELP", 0, 0, acmd_help }, |
673 | #ifndef NTRACE |
674 | { "trace", "TRACE [options]", 0, 1, acmd_trace }, |
675 | #endif |
676 | { "port", "PORT", 0, 0, acmd_port }, |
677 | { "daemon", "DAEMON", 0, 0, acmd_daemon }, |
678 | { "list", "LIST", 0, 0, acmd_list }, |
679 | { "ifname", "IFNAME peer", 1, 1, acmd_ifname }, |
680 | { "addr", "ADDR peer", 1, 1, acmd_addr }, |
c7053da9 |
681 | { "stats", "STATS peer", 1, 1, acmd_stats }, |
410c8acf |
682 | { "kill", "KILL peer", 1, 1, acmd_kill }, |
683 | { "add", "ADD peer addr port", 3, 3, acmd_add }, |
684 | { "quit", "QUIT", 0, 0, acmd_quit }, |
685 | { 0, 0, 0, 0, 0 } |
686 | }; |
687 | |
688 | static void acmd_help(admin *a, unsigned ac, char *av[]) |
689 | { |
690 | const acmd *c; |
691 | for (c = acmdtab; c->name; c++) |
692 | a_write(a, "INFO %s\n", c->help); |
693 | a_write(a, "OK\n"); |
694 | } |
695 | |
696 | /*----- Connection handling -----------------------------------------------*/ |
697 | |
fd3cf232 |
698 | /* --- @a_lock@ --- * |
410c8acf |
699 | * |
700 | * Arguments: @admin *a@ = pointer to an admin block |
701 | * |
702 | * Returns: --- |
703 | * |
fd3cf232 |
704 | * Use: Locks an admin block so that it won't be destroyed |
705 | * immediately. |
410c8acf |
706 | */ |
707 | |
fd3cf232 |
708 | static void a_lock(admin *a) { assert(!(a->f & AF_LOCK)); a->f |= AF_LOCK; } |
709 | |
710 | /* --- @a_unlock@ --- * |
711 | * |
712 | * Arguments: @admin *a@ = pointer to an admin block |
713 | * |
714 | * Returns: --- |
715 | * |
716 | * Use: Unlocks an admin block, allowing its destruction. This is |
717 | * also the second half of @a_destroy@. |
718 | */ |
719 | |
720 | static void a_unlock(admin *a) |
410c8acf |
721 | { |
fd3cf232 |
722 | assert(a->f & AF_LOCK); |
723 | if (!(a->f & AF_DEAD)) { |
724 | a->f &= ~AF_LOCK; |
725 | return; |
726 | } |
727 | |
728 | T( trace(T_ADMIN, "admin: completing destruction of connection %u", |
729 | a->seq); ) |
730 | |
410c8acf |
731 | selbuf_destroy(&a->b); |
410c8acf |
732 | if (a->pname) { |
733 | xfree(a->pname); |
734 | xfree(a->paddr); |
735 | bres_abort(&a->r); |
736 | sel_rmtimer(&a->t); |
737 | } |
fd3cf232 |
738 | if (a->b.reader.fd != a->w.fd) |
739 | close(a->b.reader.fd); |
740 | close(a->w.fd); |
741 | |
742 | if (a_stdin == a) |
743 | a_stdin = 0; |
410c8acf |
744 | if (a->next) |
745 | a->next->prev = a->prev; |
746 | if (a->prev) |
747 | a->prev->next = a->next; |
748 | else |
749 | admins = a->next; |
410c8acf |
750 | DESTROY(a); |
751 | } |
752 | |
fd3cf232 |
753 | /* --- @a_destroy@ --- * |
754 | * |
755 | * Arguments: @admin *a@ = pointer to an admin block |
756 | * |
757 | * Returns: --- |
758 | * |
759 | * Use: Destroys an admin block. This requires a certain amount of |
760 | * care. |
761 | */ |
762 | |
763 | static void a_destroy(admin *a) |
764 | { |
765 | /* --- Don't multiply destroy admin blocks --- */ |
766 | |
767 | if (a->f & AF_DEAD) |
768 | return; |
769 | |
770 | /* --- Make sure nobody expects it to work --- */ |
771 | |
772 | a->f |= AF_DEAD; |
773 | T( trace(T_ADMIN, "admin: destroying connection %u", a->seq); ) |
774 | |
775 | /* --- Free the output buffers --- */ |
776 | |
777 | if (a->o_head) { |
778 | obuf *o, *oo; |
779 | sel_rmfile(&a->w); |
780 | for (o = a->o_head; o; o = oo) { |
781 | oo = o->next; |
782 | xfree(o); |
783 | } |
784 | a->o_head = 0; |
785 | } |
786 | |
787 | /* --- If the block is locked, that's all we can manage --- */ |
788 | |
789 | if (a->f & AF_LOCK) { |
790 | T( trace(T_ADMIN, "admin: deferring destruction..."); ) |
791 | return; |
792 | } |
793 | a->f |= AF_LOCK; |
794 | a_unlock(a); |
795 | } |
796 | |
410c8acf |
797 | /* --- @a_line@ --- * |
798 | * |
799 | * Arguments: @char *p@ = pointer to the line read |
800 | * @void *vp@ = pointer to my admin block |
801 | * |
802 | * Returns: --- |
803 | * |
804 | * Use: Handles a line of input. |
805 | */ |
806 | |
807 | static void a_line(char *p, void *vp) |
808 | { |
809 | admin *a = vp; |
810 | const acmd *c; |
811 | char *av[4]; |
812 | size_t ac; |
813 | |
8d0c7a83 |
814 | TIMER; |
fd3cf232 |
815 | if (a->f & AF_DEAD) |
816 | return; |
410c8acf |
817 | if (!p) { |
818 | a_destroy(a); |
819 | return; |
820 | } |
821 | ac = str_qsplit(p, av, 4, 0, STRF_QUOTE); |
822 | if (!ac) |
823 | return; |
824 | for (p = av[0]; *p; p++) *p = tolower((unsigned char)*p); |
825 | for (c = acmdtab; c->name; c++) { |
826 | if (strcmp(av[0], c->name) == 0) { |
827 | ac--; |
828 | if (c->argmin > ac || ac > c->argmax) |
7fadfa0d |
829 | a_write(a, "FAIL syntax: %s\n", c->help); |
fd3cf232 |
830 | else { |
831 | a_lock(a); |
410c8acf |
832 | c->func(a, ac, av + 1); |
fd3cf232 |
833 | a_unlock(a); |
834 | } |
410c8acf |
835 | return; |
836 | } |
837 | } |
7fadfa0d |
838 | a_write(a, "FAIL unknown command `%s'\n", av[0]); |
410c8acf |
839 | } |
840 | |
841 | /* --- @a_create@ --- * |
842 | * |
843 | * Arguments: @int fd_in, fd_out@ = file descriptors to use |
844 | * |
845 | * Returns: --- |
846 | * |
847 | * Use: Creates a new admin connection. |
848 | */ |
849 | |
850 | void a_create(int fd_in, int fd_out) |
851 | { |
852 | admin *a = CREATE(admin); |
93bee2c4 |
853 | T( static unsigned seq = 0; |
854 | a->seq = seq++; ) |
410c8acf |
855 | T( trace(T_ADMIN, "admin: accepted connection %u", a->seq); ) |
856 | a->pname = 0; |
fd3cf232 |
857 | a->f = 0; |
410c8acf |
858 | if (fd_in == STDIN_FILENO) |
859 | a_stdin = a; |
fd3cf232 |
860 | fdflags(fd_in, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf |
861 | if (fd_out != fd_in) |
fd3cf232 |
862 | fdflags(fd_out, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf |
863 | selbuf_init(&a->b, &sel, fd_in, a_line, a); |
fd3cf232 |
864 | sel_initfile(&sel, &a->w, fd_out, SEL_WRITE, a_flush, a); |
865 | a->o_head = 0; |
866 | a->o_tail = 0; |
410c8acf |
867 | a->next = admins; |
868 | a->prev = 0; |
869 | if (admins) |
870 | admins->prev = a; |
871 | admins = a; |
872 | } |
873 | |
874 | /* --- @a_accept@ --- * |
875 | * |
876 | * Arguments: @int fd@ = file descriptor to accept |
877 | * @unsigned mode@ = what to do |
878 | * @void *v@ = uninteresting pointer |
879 | * |
880 | * Returns: --- |
881 | * |
882 | * Use: Accepts a new admin connection. |
883 | */ |
884 | |
885 | static void a_accept(int fd, unsigned mode, void *v) |
886 | { |
887 | int nfd; |
888 | struct sockaddr_un sun; |
889 | size_t sz = sizeof(sun); |
890 | |
891 | if ((nfd = accept(fd, (struct sockaddr *)&sun, &sz)) < 0) { |
892 | a_warn("accept admin connection failed: %s", strerror(errno)); |
893 | return; |
894 | } |
895 | a_create(nfd, nfd); |
896 | } |
897 | |
898 | /* --- @a_daemon@ --- * |
899 | * |
900 | * Arguments: --- |
901 | * |
902 | * Returns: --- |
903 | * |
904 | * Use: Informs the admin module that it's a daemon. |
905 | */ |
906 | |
907 | void a_daemon(void) |
908 | { |
909 | flags |= F_DAEMON; |
910 | } |
911 | |
912 | /* --- @a_init@ --- * |
913 | * |
914 | * Arguments: @const char *name@ = socket name to create |
915 | * |
916 | * Returns: --- |
917 | * |
918 | * Use: Creates the admin listening socket. |
919 | */ |
920 | |
921 | void a_init(const char *name) |
922 | { |
923 | int fd; |
924 | int n = 5; |
925 | struct sockaddr_un sun; |
926 | struct sigaction sa; |
927 | size_t sz; |
928 | |
929 | /* --- Set up the socket address --- */ |
930 | |
931 | sz = strlen(name) + 1; |
932 | if (sz > sizeof(sun.sun_path)) |
933 | die(EXIT_FAILURE, "socket name `%s' too long", name); |
934 | BURN(sun); |
935 | sun.sun_family = AF_UNIX; |
936 | memcpy(sun.sun_path, name, sz); |
937 | sz += offsetof(struct sockaddr_un, sun_path); |
938 | |
939 | /* --- Attempt to bind to the socket --- */ |
940 | |
941 | umask(0077); |
942 | again: |
943 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
944 | die(EXIT_FAILURE, "couldn't create socket: %s", strerror(errno)); |
945 | if (bind(fd, (struct sockaddr *)&sun, sz) < 0) { |
946 | struct stat st; |
947 | int e = errno; |
948 | if (errno != EADDRINUSE) { |
949 | die(EXIT_FAILURE, "couldn't bind to address `%s': %s", |
950 | sun.sun_path, strerror(e)); |
951 | } |
952 | if (!n) |
953 | die(EXIT_FAILURE, "too many retries; giving up"); |
954 | n--; |
955 | if (!connect(fd, (struct sockaddr *)&sun, sz)) { |
956 | die(EXIT_FAILURE, "server already listening on admin socket `%s'", |
957 | sun.sun_path); |
958 | } |
959 | if (errno != ECONNREFUSED) |
960 | die(EXIT_FAILURE, "couldn't bind to address: %s", strerror(e)); |
961 | if (stat(sun.sun_path, &st)) { |
962 | die(EXIT_FAILURE, "couldn't stat `%s': %s", |
963 | sun.sun_path, strerror(errno)); |
964 | } |
965 | if (!S_ISSOCK(st.st_mode)) |
966 | die(EXIT_FAILURE, "object `%s' isn't a socket", sun.sun_path); |
c7053da9 |
967 | T( trace(T_ADMIN, "admin: stale socket found; removing it"); ) |
410c8acf |
968 | unlink(sun.sun_path); |
969 | close(fd); |
970 | goto again; |
971 | } |
972 | chmod(sun.sun_path, 0600); |
973 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
974 | if (listen(fd, 5)) |
975 | die(EXIT_FAILURE, "couldn't listen on socket: %s", strerror(errno)); |
976 | |
977 | /* --- Listen to the socket --- */ |
978 | |
979 | sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0); |
980 | sel_addfile(&sock); |
981 | sockname = name; |
982 | bres_init(&sel); |
983 | T( trace_custom(a_trace, 0); |
984 | trace(T_ADMIN, "admin: enabled custom tracing"); ) |
985 | flags |= F_INIT; |
986 | |
987 | /* --- Set up signal handlers --- */ |
988 | |
989 | sig_add(&s_term, SIGTERM, a_sigdie, 0); |
990 | sig_add(&s_hup, SIGHUP, a_sighup, 0); |
991 | sigaction(SIGINT, 0, &sa); |
992 | if (sa.sa_handler != SIG_IGN) |
993 | sig_add(&s_int, SIGINT, a_sigdie, 0); |
994 | } |
995 | |
996 | /*----- That's all, folks -------------------------------------------------*/ |