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