410c8acf |
1 | /* -*-c-*- |
2 | * |
1ecee057 |
3 | * $Id: admin.c,v 1.9 2004/04/03 10:22:10 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 $ |
1ecee057 |
32 | * Revision 1.9 2004/04/03 10:22:10 mdw |
33 | * Don't warn about boring errors from @accept@. |
34 | * |
37075862 |
35 | * Revision 1.8 2003/04/06 10:25:17 mdw |
36 | * Support Linux TUN/TAP device. Fix some bugs. |
37 | * |
3008eabf |
38 | * Revision 1.7 2002/01/13 14:57:33 mdw |
39 | * Track @lbuf@ and @dstr_vputf@ changes in mLib. |
40 | * |
fd3cf232 |
41 | * Revision 1.6 2001/02/19 19:11:09 mdw |
42 | * Output buffering on admin connections. |
43 | * |
c7053da9 |
44 | * Revision 1.5 2001/02/16 21:22:51 mdw |
45 | * Support for displaying statistics. Make client connections blocking, so |
46 | * that things don't get dropped. (This might change again if I add |
47 | * buffering.) |
48 | * |
7fadfa0d |
49 | * Revision 1.4 2001/02/06 09:34:53 mdw |
50 | * Change ERR response to FAIL for consistency with other programs. |
51 | * |
93bee2c4 |
52 | * Revision 1.3 2001/02/04 01:17:12 mdw |
53 | * The `DAEMON' notification to stdout is replaced by a warning. The |
54 | * `DAEMON' and `QUIT' command send `OK' on successful completion. Put |
55 | * assignment of sequence number in a T(...) guard. |
56 | * |
8d0c7a83 |
57 | * Revision 1.2 2001/02/03 22:40:29 mdw |
58 | * Put timer information into the entropy pool when packets are received |
59 | * and on similar events. Reseed the generator on the interval timer. |
60 | * |
410c8acf |
61 | * Revision 1.1 2001/02/03 20:26:37 mdw |
62 | * Initial checkin. |
63 | * |
64 | */ |
65 | |
66 | /*----- Header files ------------------------------------------------------*/ |
67 | |
68 | #include "tripe.h" |
69 | |
70 | /*----- Global variables --------------------------------------------------*/ |
71 | |
72 | #ifndef NTRACE |
73 | |
74 | const trace_opt tr_opts[] = { |
75 | { 't', T_TUNNEL, "tunnel events" }, |
76 | { 'r', T_PEER, "peer events" }, |
77 | { 'a', T_ADMIN, "admin interface" }, |
78 | { 'p', T_PACKET, "packet contents" }, |
79 | { 'c', T_CRYPTO, "crypto details" }, |
80 | { 's', T_KEYSET, "symmetric keyset management" }, |
81 | { 'x', T_KEYEXCH, "key exchange" }, |
82 | { 'm', T_KEYMGMT, "key management" }, |
83 | { 'A', T_ALL, "all of the above" }, |
84 | { 0, 0, 0 } |
85 | }; |
86 | |
87 | unsigned tr_flags = 0; |
88 | #endif |
89 | |
90 | /*----- Static variables --------------------------------------------------*/ |
91 | |
92 | static admin *admins; |
93 | static sel_file sock; |
94 | static const char *sockname; |
95 | static unsigned flags = 0; |
96 | static admin *a_stdin = 0; |
97 | static sig s_term, s_int, s_hup; |
98 | |
99 | #define F_DAEMON 1u |
100 | #define F_INIT 2u |
101 | |
102 | #define T_RESOLVE SEC(30) |
103 | |
fd3cf232 |
104 | static void a_destroy(admin */*a*/); |
105 | static void a_lock(admin */*a*/); |
106 | static void a_unlock(admin */*a*/); |
107 | |
108 | /*----- Output functions --------------------------------------------------*/ |
109 | |
110 | /* --- @trywrite@ --- * |
111 | * |
112 | * Arguments: @admin *a@ = pointer to an admin block |
113 | * @const char *p@ = pointer to buffer to write |
114 | * @size_t sz@ = size of data to write |
115 | * |
116 | * Returns: The number of bytes written, or less than zero on error. |
117 | * |
118 | * Use: Attempts to write data to a client. |
119 | */ |
120 | |
121 | static ssize_t trywrite(admin *a, const char *p, size_t sz) |
122 | { |
123 | ssize_t n, done = 0; |
124 | |
125 | again: |
126 | if (!sz) |
127 | return (done); |
128 | n = write(a->w.fd, p, sz); |
129 | if (n > 0) { |
130 | done += n; |
131 | p += n; |
132 | sz -= n; |
133 | goto again; |
134 | } |
135 | if (n < 0) { |
136 | if (errno == EINTR) |
137 | goto again; |
138 | if (errno != EAGAIN && errno != EWOULDBLOCK) { |
139 | a_destroy(a); |
140 | a_warn("disconnecting admin client due to write errors: %s", |
141 | strerror(errno)); |
142 | return (-1); |
143 | } |
144 | } |
145 | return (done); |
146 | } |
147 | |
148 | /* --- @dosend@ --- * |
149 | * |
150 | * Arguemnts: @admin *a@ = pointer to an admin block |
151 | * @const char *p@ = pointer to buffer to write |
152 | * @size_t sz@ = size of data to write |
153 | * |
154 | * Returns: --- |
155 | * |
156 | * Use: Sends data to an admin client. |
157 | */ |
158 | |
159 | static void dosend(admin *a, const char *p, size_t sz) |
160 | { |
161 | ssize_t n; |
162 | obuf *o; |
163 | |
164 | if (a->f & AF_DEAD) |
165 | return; |
166 | |
167 | /* --- Try to send the data immediately --- */ |
168 | |
169 | if (!a->o_head) { |
170 | if ((n = trywrite(a, p, sz)) < 0) |
171 | return; |
172 | p += n; |
173 | sz -= n; |
174 | if (!sz) |
175 | return; |
176 | } |
177 | |
178 | /* --- Fill buffers with the data until it's all gone --- */ |
179 | |
180 | o = a->o_tail; |
181 | if (!o) |
182 | sel_addfile(&a->w); |
183 | else if (o->p_in < o->buf + OBUFSZ) |
184 | goto noalloc; |
185 | |
186 | do { |
187 | o = xmalloc(sizeof(obuf)); |
188 | o->next = 0; |
189 | o->p_in = o->p_out = o->buf; |
190 | if (a->o_tail) |
191 | a->o_tail->next = o; |
192 | else |
193 | a->o_head = o; |
194 | a->o_tail = o; |
195 | |
196 | noalloc: |
197 | n = o->buf + OBUFSZ - o->p_in; |
198 | if (n > sz) |
199 | n = sz; |
200 | memcpy(o->p_in, p, n); |
201 | o->p_in += n; |
202 | p += n; |
203 | sz -= n; |
204 | } while (sz); |
205 | } |
206 | |
207 | /* --- @a_flush@ --- * |
208 | * |
209 | * Arguments: @int fd@ = file descriptor |
210 | * @unsigned mode@ = what's happening |
211 | * @void *v@ = pointer to my admin block |
212 | * |
213 | * Returns: --- |
214 | * |
215 | * Use: Flushes buffers when a client is ready to read again. |
216 | */ |
217 | |
218 | static void a_flush(int fd, unsigned mode, void *v) |
219 | { |
220 | admin *a = v; |
221 | obuf *o, *oo; |
222 | ssize_t n; |
223 | |
224 | o = a->o_head; |
225 | while (o) { |
226 | if ((n = trywrite(a, o->p_out, o->p_in - o->p_out)) < 0) |
227 | return; |
228 | o->p_out += n; |
229 | if (o->p_in < o->p_out) |
230 | break; |
231 | oo = o; |
232 | o = o->next; |
233 | xfree(oo); |
234 | } |
235 | a->o_head = o; |
236 | if (!o) { |
237 | a->o_tail = 0; |
238 | sel_rmfile(&a->w); |
239 | } |
240 | } |
241 | |
410c8acf |
242 | /*----- Utility functions -------------------------------------------------*/ |
243 | |
244 | /* --- @a_write@ --- * |
245 | * |
246 | * Arguments: @admin *a@ = admin connection to write to |
247 | * @const char *fmt@ = pointer to format string |
248 | * @...@ = other arguments |
249 | * |
250 | * Returns: --- |
251 | * |
252 | * Use: Sends a message to an admin connection. |
253 | */ |
254 | |
255 | static void a_write(admin *a, const char *fmt, ...) |
256 | { |
257 | va_list ap; |
258 | dstr d = DSTR_INIT; |
259 | va_start(ap, fmt); |
3008eabf |
260 | dstr_vputf(&d, fmt, &ap); |
410c8acf |
261 | va_end(ap); |
fd3cf232 |
262 | dosend(a, d.buf, d.len); |
410c8acf |
263 | dstr_destroy(&d); |
264 | } |
265 | |
266 | /* --- @a_warn@ --- * |
267 | * |
268 | * Arguments: @const char *fmt@ = pointer to format string |
269 | * @...@ = other arguments |
270 | * |
271 | * Returns: --- |
272 | * |
273 | * Use: Informs all admin connections of a warning. |
274 | */ |
275 | |
276 | void a_warn(const char *fmt, ...) |
277 | { |
278 | va_list ap; |
fd3cf232 |
279 | admin *a, *aa; |
410c8acf |
280 | dstr d = DSTR_INIT; |
281 | |
282 | if (flags & F_INIT) |
283 | dstr_puts(&d, "WARN "); |
284 | va_start(ap, fmt); |
37075862 |
285 | dstr_vputf(&d, fmt, &ap); |
410c8acf |
286 | va_end(ap); |
287 | if (!(flags & F_INIT)) |
288 | moan("%s", d.buf); |
289 | else { |
290 | dstr_putc(&d, '\n'); |
fd3cf232 |
291 | for (a = admins; a; a = aa) { |
292 | aa = a->next; |
293 | dosend(a, d.buf, d.len); |
294 | } |
410c8acf |
295 | } |
296 | dstr_destroy(&d); |
297 | } |
298 | |
299 | /* --- @a_trace@ --- * |
300 | * |
301 | * Arguments: @const char *p@ = pointer to a buffer |
302 | * @size_t sz@ = size of the buffer |
303 | * @void *v@ = uninteresting pointer |
304 | * |
305 | * Returns: --- |
306 | * |
307 | * Use: Custom trace output handler. |
308 | */ |
309 | |
310 | #ifndef NTRACE |
311 | static void a_trace(const char *p, size_t sz, void *v) |
312 | { |
313 | dstr d = DSTR_INIT; |
fd3cf232 |
314 | admin *a, *aa; |
410c8acf |
315 | |
316 | dstr_puts(&d, "TRACE "); |
317 | dstr_putm(&d, p, sz); |
318 | dstr_putc(&d, '\n'); |
fd3cf232 |
319 | for (a = admins; a; a = aa) { |
320 | aa = a->next; |
321 | dosend(a, d.buf, d.len); |
322 | } |
410c8acf |
323 | dstr_destroy(&d); |
324 | } |
325 | #endif |
326 | |
327 | /* --- @a_quit@ --- * |
328 | * |
329 | * Arguments: --- |
330 | * |
331 | * Returns: --- |
332 | * |
333 | * Use: Shuts things down nicely. |
334 | */ |
335 | |
336 | void a_quit(void) |
337 | { |
338 | close(sock.fd); |
339 | unlink(sockname); |
340 | exit(0); |
341 | } |
342 | |
343 | /* --- @a_sigdie@ --- * |
344 | * |
345 | * Arguments: @int sig@ = signal number |
346 | * @void *v@ = an uninteresting argument |
347 | * |
348 | * Returns: --- |
349 | * |
350 | * Use Shuts down on receipt of a fatal signal. |
351 | */ |
352 | |
353 | static void a_sigdie(int sig, void *v) |
354 | { |
355 | char *p; |
356 | char buf[20]; |
357 | |
358 | switch (sig) { |
359 | case SIGTERM: p = "SIGTERM"; break; |
360 | case SIGINT: p = "SIGINT"; break; |
361 | default: |
362 | sprintf(buf, "signal %i", sig); |
363 | p = buf; |
364 | break; |
365 | } |
366 | a_warn("shutting down on %s", p); |
367 | a_quit(); |
368 | } |
369 | |
370 | /* --- @a_sighup@ --- * |
371 | * |
372 | * Arguments: @int sig@ = signal number |
373 | * @void *v@ = an uninteresting argument |
374 | * |
375 | * Returns: --- |
376 | * |
377 | * Use Logs a message about SIGHUP not being useful. |
378 | */ |
379 | |
380 | static void a_sighup(int sig, void *v) |
381 | { |
382 | a_warn("received SIGHUP: ignoring"); |
383 | } |
384 | |
385 | /*----- Adding peers ------------------------------------------------------*/ |
386 | |
387 | /* --- @a_resolve@ --- * |
388 | * |
389 | * Arguments: @struct hostent *h@ = pointer to resolved hostname |
390 | * @void *v@ = pointer to admin block |
391 | * |
392 | * Returns: --- |
393 | * |
394 | * Use: Handles a completed name resolution. |
395 | */ |
396 | |
397 | static void a_resolve(struct hostent *h, void *v) |
398 | { |
399 | admin *a = v; |
fd3cf232 |
400 | |
401 | a_lock(a); |
410c8acf |
402 | T( trace(T_ADMIN, "admin: %u resolved", a->seq); ) |
8d0c7a83 |
403 | TIMER; |
410c8acf |
404 | sel_rmtimer(&a->t); |
405 | if (!h) |
7fadfa0d |
406 | a_write(a, "FAIL couldn't resolve hostname `%s'\n", a->paddr); |
410c8acf |
407 | else if (p_find(a->pname)) |
7fadfa0d |
408 | a_write(a, "FAIL peer `%s' already registered\n", a->pname); |
410c8acf |
409 | else { |
410 | memcpy(&a->peer.sin.sin_addr, h->h_addr, sizeof(struct in_addr)); |
411 | if (!p_create(a->pname, &a->peer.sa, a->sasz)) |
7fadfa0d |
412 | a_write(a, "FAIL couldn't create peer\n"); |
410c8acf |
413 | else |
414 | a_write(a, "OK\n"); |
415 | } |
416 | xfree(a->pname); |
417 | xfree(a->paddr); |
418 | a->pname = 0; |
419 | selbuf_enable(&a->b); |
fd3cf232 |
420 | a_unlock(a); |
410c8acf |
421 | } |
422 | |
423 | /* --- @a_timer@ --- * |
424 | * |
425 | * Arguments: @struct timeval *tv@ = timer |
426 | * @void *v@ = pointer to admin block |
427 | * |
428 | * Returns: --- |
429 | * |
430 | * Use: Times out a resolver. |
431 | */ |
432 | |
433 | static void a_timer(struct timeval *tv, void *v) |
434 | { |
435 | admin *a = v; |
fd3cf232 |
436 | |
437 | a_lock(a); |
410c8acf |
438 | T( trace(T_ADMIN, "admin: %u resolver timeout", a->seq); ) |
439 | bres_abort(&a->r); |
7fadfa0d |
440 | a_write(a, "FAIL timeout resolving `%s'\n", a->paddr); |
410c8acf |
441 | xfree(a->pname); |
442 | xfree(a->paddr); |
443 | a->pname = 0; |
444 | selbuf_enable(&a->b); |
fd3cf232 |
445 | a_unlock(a); |
410c8acf |
446 | } |
447 | |
448 | /* --- @acmd_add@ --- * |
449 | * |
450 | * Arguments: @admin *a@ = connection which requested the addition |
451 | * @unsigned ac@ = argument count |
452 | * @char *av[]@ = pointer to the argument list |
453 | * |
454 | * Returns: --- |
455 | * |
456 | * Use: Adds a new peer. |
457 | */ |
458 | |
459 | static void acmd_add(admin *a, unsigned ac, char *av[]) |
460 | { |
461 | unsigned long pt; |
462 | struct timeval tv; |
463 | char *p; |
464 | |
465 | /* --- Make sure someone's not got there already --- */ |
466 | |
467 | if (p_find(av[0])) { |
7fadfa0d |
468 | a_write(a, "FAIL peer `%s' already registered\n", av[0]); |
410c8acf |
469 | return; |
470 | } |
471 | |
472 | /* --- Fill in the easy bits of address --- */ |
473 | |
474 | BURN(a->peer); |
475 | a->peer.sin.sin_family = AF_INET; |
476 | a->sasz = sizeof(a->peer.sin); |
477 | pt = strtoul(av[2], &p, 0); |
478 | if (*p) { |
479 | struct servent *s = getservbyname(av[2], "udp"); |
480 | if (!s) { |
7fadfa0d |
481 | a_write(a, "FAIL service `%s' not known\n", av[2]); |
410c8acf |
482 | return; |
483 | } |
484 | pt = ntohs(s->s_port); |
485 | } |
486 | if (pt == 0 || pt >= 65536) { |
7fadfa0d |
487 | a_write(a, "FAIL bad port number %lu\n", pt); |
410c8acf |
488 | return; |
489 | } |
490 | a->peer.sin.sin_port = htons(pt); |
491 | |
492 | /* --- If the name is numeric, do it the easy way --- */ |
493 | |
494 | if (inet_aton(av[1], &a->peer.sin.sin_addr)) { |
495 | if (!p_create(av[0], &a->peer.sa, a->sasz)) |
7fadfa0d |
496 | a_write(a, "FAIL couldn't create peer\n"); |
410c8acf |
497 | else |
498 | a_write(a, "OK\n"); |
499 | return; |
500 | } |
501 | |
502 | /* --- Store everything for later and crank up the resolver --- * |
503 | * |
504 | * We disable the line buffer until the resolver completes (or times out). |
505 | * This prevents other commands on the same connection (though the rest of |
506 | * the system continues regardless), but makes life simpler for the client. |
507 | */ |
508 | |
509 | a->pname = xstrdup(av[0]); |
510 | a->paddr = xstrdup(av[1]); |
511 | selbuf_disable(&a->b); |
512 | gettimeofday(&tv, 0); |
513 | tv.tv_sec += T_RESOLVE; |
514 | sel_addtimer(&sel, &a->t, &tv, a_timer, a); |
515 | bres_byname(&a->r, a->paddr, a_resolve, a); |
516 | T( trace(T_ADMIN, "admin: %u resolving hostname `%s'", |
517 | a->seq, a->paddr); ) |
518 | } |
519 | |
520 | /*----- Administration commands -------------------------------------------*/ |
521 | |
522 | /* --- Miscellaneous commands --- */ |
523 | |
524 | #ifndef NTRACE |
525 | |
526 | static void acmd_trace(admin *a, unsigned ac, char *av[]) |
527 | { |
528 | if (!ac || strcmp(av[0], "?") == 0) { |
529 | const trace_opt *t; |
530 | a_write(a, "INFO Trace options:\n"); |
531 | for (t = tr_opts; t->ch; t++) { |
532 | a_write(a, "INFO %c %c %s\n", |
533 | t->ch, (tr_flags & t->f) == t->f ? '*' : ' ', t->help); |
534 | } |
535 | } else { |
536 | unsigned sense = 1; |
537 | unsigned f = tr_flags; |
538 | const trace_opt *tt; |
539 | char *p = av[0]; |
540 | |
541 | while (*p) { |
542 | switch (*p) { |
543 | case '+': sense = 1; break; |
544 | case '-': sense = 0; break; |
545 | default: |
546 | for (tt = tr_opts; tt->ch; tt++) { |
547 | if (tt->ch == *p) { |
548 | if (sense) f |= tt->f; |
549 | else f &= ~tt->f; |
550 | goto tropt_ok; |
551 | } |
552 | } |
7fadfa0d |
553 | a_write(a, "FAIL unknown trace option `%c'\n", *p); |
410c8acf |
554 | return; |
555 | tropt_ok:; |
556 | break; |
557 | } |
558 | p++; |
559 | } |
560 | tr_flags = f; |
561 | trace_level(tr_flags); |
562 | } |
563 | a_write(a, "OK\n"); |
564 | } |
565 | |
566 | #endif |
567 | |
568 | static void acmd_port(admin *a, unsigned ac, char *av[]) |
569 | { |
570 | a_write(a, "INFO %u\nOK\n", p_port()); |
571 | } |
572 | |
410c8acf |
573 | static void acmd_daemon(admin *a, unsigned ac, char *av[]) |
574 | { |
575 | if (flags & F_DAEMON) |
7fadfa0d |
576 | a_write(a, "FAIL already running as a daemon\n"); |
410c8acf |
577 | else { |
93bee2c4 |
578 | a_warn("becoming a daemon"); |
579 | if (a_stdin) |
410c8acf |
580 | a_destroy(a_stdin); |
410c8acf |
581 | if (u_daemon()) |
7fadfa0d |
582 | a_write(a, "FAIL error becoming a daemon: %s", strerror(errno)); |
93bee2c4 |
583 | else { |
410c8acf |
584 | flags |= F_DAEMON; |
93bee2c4 |
585 | a_write(a, "OK\n"); |
586 | } |
410c8acf |
587 | } |
588 | } |
589 | |
590 | static void acmd_list(admin *a, unsigned ac, char *av[]) |
591 | { |
592 | peer *p; |
593 | for (p = p_first(); p; p = p_next(p)) |
594 | a_write(a, "INFO %s\n", p_name(p)); |
595 | a_write(a, "OK\n"); |
596 | } |
597 | |
598 | static void acmd_ifname(admin *a, unsigned ac, char *av[]) |
599 | { |
600 | peer *p; |
601 | |
602 | if ((p = p_find(av[0])) == 0) |
7fadfa0d |
603 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
410c8acf |
604 | else |
605 | a_write(a, "INFO %s\nOK\n", p_ifname(p)); |
606 | } |
607 | |
608 | static void acmd_addr(admin *a, unsigned ac, char *av[]) |
609 | { |
610 | peer *p; |
611 | const addr *ad; |
612 | |
613 | if ((p = p_find(av[0])) == 0) |
7fadfa0d |
614 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
410c8acf |
615 | else { |
616 | ad = p_addr(p); |
617 | assert(ad->sa.sa_family == AF_INET); |
618 | a_write(a, "INFO %s %u\nOK\n", |
619 | inet_ntoa(ad->sin.sin_addr), |
620 | (unsigned)ntohs(ad->sin.sin_port)); |
621 | } |
622 | } |
623 | |
c7053da9 |
624 | static void acmd_stats(admin *a, unsigned ac, char *av[]) |
625 | { |
626 | peer *p; |
627 | stats *st; |
628 | |
629 | if ((p = p_find(av[0])) == 0) |
630 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
631 | else { |
632 | st = p_stats(p); |
633 | a_write(a, "INFO start-time=%s\n", timestr(st->t_start)); |
634 | a_write(a, "INFO last-packet-time=%s\n", timestr(st->t_last)); |
635 | a_write(a, "INFO packets-in=%lu bytes-in=%lu\n", st->n_in, st->sz_in); |
636 | a_write(a, "INFO packets-out=%lu bytes-out=%lu\n", |
637 | st->n_out, st->sz_out); |
638 | a_write(a, "INFO keyexch-packets-in=%lu keyexch-bytes-in=%lu\n", |
639 | st->n_kxin, st->sz_kxin); |
640 | a_write(a, "INFO keyexch-packets-out=%lu keyexch-bytes-out=%lu\n", |
641 | st->n_kxout, st->sz_kxout); |
642 | a_write(a, "INFO ip-packets-in=%lu ip-bytes-in=%lu\n", |
643 | st->n_ipin, st->sz_ipin); |
644 | a_write(a, "INFO ip-packets-out=%lu ip-bytes-out=%lu\n", |
645 | st->n_ipout, st->sz_ipout); |
646 | a_write(a, "INFO rejected-packets=%lu\n", st->n_reject); |
647 | a_write(a, "OK\n"); |
648 | } |
649 | } |
650 | |
410c8acf |
651 | static void acmd_kill(admin *a, unsigned ac, char *av[]) |
652 | { |
653 | peer *p; |
654 | if ((p = p_find(av[0])) == 0) |
7fadfa0d |
655 | a_write(a, "FAIL peer `%s' not found\n", av[0]); |
410c8acf |
656 | else { |
657 | p_destroy(p); |
658 | a_write(a, "OK\n"); |
659 | } |
660 | } |
661 | |
662 | static void acmd_quit(admin *a, unsigned ac, char *av[]) |
663 | { |
664 | a_warn("closing down on admin request"); |
93bee2c4 |
665 | a_write(a, "OK\n"); |
410c8acf |
666 | a_quit(); |
667 | } |
668 | |
669 | /* --- The command table and help --- */ |
670 | |
671 | typedef struct acmd { |
672 | const char *name; |
673 | const char *help; |
674 | unsigned argmin, argmax; |
675 | void (*func)(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
676 | } acmd; |
677 | |
678 | static void acmd_help(admin */*a*/, unsigned /*ac*/, char */*av*/[]); |
679 | |
680 | static const acmd acmdtab[] = { |
681 | { "help", "HELP", 0, 0, acmd_help }, |
682 | #ifndef NTRACE |
683 | { "trace", "TRACE [options]", 0, 1, acmd_trace }, |
684 | #endif |
685 | { "port", "PORT", 0, 0, acmd_port }, |
686 | { "daemon", "DAEMON", 0, 0, acmd_daemon }, |
687 | { "list", "LIST", 0, 0, acmd_list }, |
688 | { "ifname", "IFNAME peer", 1, 1, acmd_ifname }, |
689 | { "addr", "ADDR peer", 1, 1, acmd_addr }, |
c7053da9 |
690 | { "stats", "STATS peer", 1, 1, acmd_stats }, |
410c8acf |
691 | { "kill", "KILL peer", 1, 1, acmd_kill }, |
692 | { "add", "ADD peer addr port", 3, 3, acmd_add }, |
693 | { "quit", "QUIT", 0, 0, acmd_quit }, |
694 | { 0, 0, 0, 0, 0 } |
695 | }; |
696 | |
697 | static void acmd_help(admin *a, unsigned ac, char *av[]) |
698 | { |
699 | const acmd *c; |
700 | for (c = acmdtab; c->name; c++) |
701 | a_write(a, "INFO %s\n", c->help); |
702 | a_write(a, "OK\n"); |
703 | } |
704 | |
705 | /*----- Connection handling -----------------------------------------------*/ |
706 | |
fd3cf232 |
707 | /* --- @a_lock@ --- * |
410c8acf |
708 | * |
709 | * Arguments: @admin *a@ = pointer to an admin block |
710 | * |
711 | * Returns: --- |
712 | * |
fd3cf232 |
713 | * Use: Locks an admin block so that it won't be destroyed |
714 | * immediately. |
410c8acf |
715 | */ |
716 | |
fd3cf232 |
717 | static void a_lock(admin *a) { assert(!(a->f & AF_LOCK)); a->f |= AF_LOCK; } |
718 | |
719 | /* --- @a_unlock@ --- * |
720 | * |
721 | * Arguments: @admin *a@ = pointer to an admin block |
722 | * |
723 | * Returns: --- |
724 | * |
725 | * Use: Unlocks an admin block, allowing its destruction. This is |
726 | * also the second half of @a_destroy@. |
727 | */ |
728 | |
729 | static void a_unlock(admin *a) |
410c8acf |
730 | { |
fd3cf232 |
731 | assert(a->f & AF_LOCK); |
732 | if (!(a->f & AF_DEAD)) { |
733 | a->f &= ~AF_LOCK; |
734 | return; |
735 | } |
736 | |
737 | T( trace(T_ADMIN, "admin: completing destruction of connection %u", |
738 | a->seq); ) |
739 | |
410c8acf |
740 | selbuf_destroy(&a->b); |
410c8acf |
741 | if (a->pname) { |
742 | xfree(a->pname); |
743 | xfree(a->paddr); |
744 | bres_abort(&a->r); |
745 | sel_rmtimer(&a->t); |
746 | } |
fd3cf232 |
747 | if (a->b.reader.fd != a->w.fd) |
748 | close(a->b.reader.fd); |
749 | close(a->w.fd); |
750 | |
751 | if (a_stdin == a) |
752 | a_stdin = 0; |
410c8acf |
753 | if (a->next) |
754 | a->next->prev = a->prev; |
755 | if (a->prev) |
756 | a->prev->next = a->next; |
757 | else |
758 | admins = a->next; |
410c8acf |
759 | DESTROY(a); |
760 | } |
761 | |
fd3cf232 |
762 | /* --- @a_destroy@ --- * |
763 | * |
764 | * Arguments: @admin *a@ = pointer to an admin block |
765 | * |
766 | * Returns: --- |
767 | * |
768 | * Use: Destroys an admin block. This requires a certain amount of |
769 | * care. |
770 | */ |
771 | |
772 | static void a_destroy(admin *a) |
773 | { |
774 | /* --- Don't multiply destroy admin blocks --- */ |
775 | |
776 | if (a->f & AF_DEAD) |
777 | return; |
778 | |
779 | /* --- Make sure nobody expects it to work --- */ |
780 | |
781 | a->f |= AF_DEAD; |
782 | T( trace(T_ADMIN, "admin: destroying connection %u", a->seq); ) |
783 | |
784 | /* --- Free the output buffers --- */ |
785 | |
786 | if (a->o_head) { |
787 | obuf *o, *oo; |
788 | sel_rmfile(&a->w); |
789 | for (o = a->o_head; o; o = oo) { |
790 | oo = o->next; |
791 | xfree(o); |
792 | } |
793 | a->o_head = 0; |
794 | } |
795 | |
796 | /* --- If the block is locked, that's all we can manage --- */ |
797 | |
798 | if (a->f & AF_LOCK) { |
799 | T( trace(T_ADMIN, "admin: deferring destruction..."); ) |
800 | return; |
801 | } |
802 | a->f |= AF_LOCK; |
803 | a_unlock(a); |
804 | } |
805 | |
410c8acf |
806 | /* --- @a_line@ --- * |
807 | * |
808 | * Arguments: @char *p@ = pointer to the line read |
3008eabf |
809 | * @size_t len@ = length of the line |
410c8acf |
810 | * @void *vp@ = pointer to my admin block |
811 | * |
812 | * Returns: --- |
813 | * |
814 | * Use: Handles a line of input. |
815 | */ |
816 | |
3008eabf |
817 | static void a_line(char *p, size_t len, void *vp) |
410c8acf |
818 | { |
819 | admin *a = vp; |
820 | const acmd *c; |
821 | char *av[4]; |
822 | size_t ac; |
823 | |
8d0c7a83 |
824 | TIMER; |
fd3cf232 |
825 | if (a->f & AF_DEAD) |
826 | return; |
410c8acf |
827 | if (!p) { |
828 | a_destroy(a); |
829 | return; |
830 | } |
831 | ac = str_qsplit(p, av, 4, 0, STRF_QUOTE); |
832 | if (!ac) |
833 | return; |
834 | for (p = av[0]; *p; p++) *p = tolower((unsigned char)*p); |
835 | for (c = acmdtab; c->name; c++) { |
836 | if (strcmp(av[0], c->name) == 0) { |
837 | ac--; |
838 | if (c->argmin > ac || ac > c->argmax) |
7fadfa0d |
839 | a_write(a, "FAIL syntax: %s\n", c->help); |
fd3cf232 |
840 | else { |
841 | a_lock(a); |
410c8acf |
842 | c->func(a, ac, av + 1); |
fd3cf232 |
843 | a_unlock(a); |
844 | } |
410c8acf |
845 | return; |
846 | } |
847 | } |
7fadfa0d |
848 | a_write(a, "FAIL unknown command `%s'\n", av[0]); |
410c8acf |
849 | } |
850 | |
851 | /* --- @a_create@ --- * |
852 | * |
853 | * Arguments: @int fd_in, fd_out@ = file descriptors to use |
854 | * |
855 | * Returns: --- |
856 | * |
857 | * Use: Creates a new admin connection. |
858 | */ |
859 | |
860 | void a_create(int fd_in, int fd_out) |
861 | { |
862 | admin *a = CREATE(admin); |
93bee2c4 |
863 | T( static unsigned seq = 0; |
864 | a->seq = seq++; ) |
410c8acf |
865 | T( trace(T_ADMIN, "admin: accepted connection %u", a->seq); ) |
866 | a->pname = 0; |
fd3cf232 |
867 | a->f = 0; |
410c8acf |
868 | if (fd_in == STDIN_FILENO) |
869 | a_stdin = a; |
fd3cf232 |
870 | fdflags(fd_in, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf |
871 | if (fd_out != fd_in) |
fd3cf232 |
872 | fdflags(fd_out, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf |
873 | selbuf_init(&a->b, &sel, fd_in, a_line, a); |
fd3cf232 |
874 | sel_initfile(&sel, &a->w, fd_out, SEL_WRITE, a_flush, a); |
875 | a->o_head = 0; |
876 | a->o_tail = 0; |
410c8acf |
877 | a->next = admins; |
878 | a->prev = 0; |
879 | if (admins) |
880 | admins->prev = a; |
881 | admins = a; |
882 | } |
883 | |
884 | /* --- @a_accept@ --- * |
885 | * |
886 | * Arguments: @int fd@ = file descriptor to accept |
887 | * @unsigned mode@ = what to do |
888 | * @void *v@ = uninteresting pointer |
889 | * |
890 | * Returns: --- |
891 | * |
892 | * Use: Accepts a new admin connection. |
893 | */ |
894 | |
895 | static void a_accept(int fd, unsigned mode, void *v) |
896 | { |
897 | int nfd; |
898 | struct sockaddr_un sun; |
899 | size_t sz = sizeof(sun); |
900 | |
901 | if ((nfd = accept(fd, (struct sockaddr *)&sun, &sz)) < 0) { |
1ecee057 |
902 | if (errno != EINTR && errno != EAGAIN && errno != EWOULDBLOCK && |
903 | errno != ECONNABORTED && errno != EPROTO) |
904 | a_warn("accept admin connection failed: %s", strerror(errno)); |
410c8acf |
905 | return; |
906 | } |
907 | a_create(nfd, nfd); |
908 | } |
909 | |
910 | /* --- @a_daemon@ --- * |
911 | * |
912 | * Arguments: --- |
913 | * |
914 | * Returns: --- |
915 | * |
916 | * Use: Informs the admin module that it's a daemon. |
917 | */ |
918 | |
919 | void a_daemon(void) |
920 | { |
921 | flags |= F_DAEMON; |
922 | } |
923 | |
924 | /* --- @a_init@ --- * |
925 | * |
926 | * Arguments: @const char *name@ = socket name to create |
927 | * |
928 | * Returns: --- |
929 | * |
930 | * Use: Creates the admin listening socket. |
931 | */ |
932 | |
933 | void a_init(const char *name) |
934 | { |
935 | int fd; |
936 | int n = 5; |
937 | struct sockaddr_un sun; |
938 | struct sigaction sa; |
939 | size_t sz; |
940 | |
941 | /* --- Set up the socket address --- */ |
942 | |
943 | sz = strlen(name) + 1; |
944 | if (sz > sizeof(sun.sun_path)) |
945 | die(EXIT_FAILURE, "socket name `%s' too long", name); |
946 | BURN(sun); |
947 | sun.sun_family = AF_UNIX; |
948 | memcpy(sun.sun_path, name, sz); |
949 | sz += offsetof(struct sockaddr_un, sun_path); |
950 | |
951 | /* --- Attempt to bind to the socket --- */ |
952 | |
953 | umask(0077); |
954 | again: |
955 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
956 | die(EXIT_FAILURE, "couldn't create socket: %s", strerror(errno)); |
957 | if (bind(fd, (struct sockaddr *)&sun, sz) < 0) { |
958 | struct stat st; |
959 | int e = errno; |
960 | if (errno != EADDRINUSE) { |
961 | die(EXIT_FAILURE, "couldn't bind to address `%s': %s", |
962 | sun.sun_path, strerror(e)); |
963 | } |
964 | if (!n) |
965 | die(EXIT_FAILURE, "too many retries; giving up"); |
966 | n--; |
967 | if (!connect(fd, (struct sockaddr *)&sun, sz)) { |
968 | die(EXIT_FAILURE, "server already listening on admin socket `%s'", |
969 | sun.sun_path); |
970 | } |
971 | if (errno != ECONNREFUSED) |
972 | die(EXIT_FAILURE, "couldn't bind to address: %s", strerror(e)); |
973 | if (stat(sun.sun_path, &st)) { |
974 | die(EXIT_FAILURE, "couldn't stat `%s': %s", |
975 | sun.sun_path, strerror(errno)); |
976 | } |
977 | if (!S_ISSOCK(st.st_mode)) |
978 | die(EXIT_FAILURE, "object `%s' isn't a socket", sun.sun_path); |
c7053da9 |
979 | T( trace(T_ADMIN, "admin: stale socket found; removing it"); ) |
410c8acf |
980 | unlink(sun.sun_path); |
981 | close(fd); |
982 | goto again; |
983 | } |
984 | chmod(sun.sun_path, 0600); |
985 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
986 | if (listen(fd, 5)) |
987 | die(EXIT_FAILURE, "couldn't listen on socket: %s", strerror(errno)); |
988 | |
989 | /* --- Listen to the socket --- */ |
990 | |
991 | sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0); |
992 | sel_addfile(&sock); |
993 | sockname = name; |
994 | bres_init(&sel); |
995 | T( trace_custom(a_trace, 0); |
996 | trace(T_ADMIN, "admin: enabled custom tracing"); ) |
997 | flags |= F_INIT; |
998 | |
999 | /* --- Set up signal handlers --- */ |
1000 | |
1001 | sig_add(&s_term, SIGTERM, a_sigdie, 0); |
1002 | sig_add(&s_hup, SIGHUP, a_sighup, 0); |
1003 | sigaction(SIGINT, 0, &sa); |
1004 | if (sa.sa_handler != SIG_IGN) |
1005 | sig_add(&s_int, SIGINT, a_sigdie, 0); |
1006 | } |
1007 | |
1008 | /*----- That's all, folks -------------------------------------------------*/ |