3 * $Id: admin.c,v 1.7 2002/01/13 14:57:33 mdw Exp $
5 * Admin interface for configuration
7 * (c) 2001 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Trivial IP Encryption (TrIPE).
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.
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.
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.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.7 2002/01/13 14:57:33 mdw
33 * Track @lbuf@ and @dstr_vputf@ changes in mLib.
35 * Revision 1.6 2001/02/19 19:11:09 mdw
36 * Output buffering on admin connections.
38 * Revision 1.5 2001/02/16 21:22:51 mdw
39 * Support for displaying statistics. Make client connections blocking, so
40 * that things don't get dropped. (This might change again if I add
43 * Revision 1.4 2001/02/06 09:34:53 mdw
44 * Change ERR response to FAIL for consistency with other programs.
46 * Revision 1.3 2001/02/04 01:17:12 mdw
47 * The `DAEMON' notification to stdout is replaced by a warning. The
48 * `DAEMON' and `QUIT' command send `OK' on successful completion. Put
49 * assignment of sequence number in a T(...) guard.
51 * Revision 1.2 2001/02/03 22:40:29 mdw
52 * Put timer information into the entropy pool when packets are received
53 * and on similar events. Reseed the generator on the interval timer.
55 * Revision 1.1 2001/02/03 20:26:37 mdw
60 /*----- Header files ------------------------------------------------------*/
64 /*----- Global variables --------------------------------------------------*/
68 const trace_opt tr_opts[] = {
69 { 't', T_TUNNEL, "tunnel events" },
70 { 'r', T_PEER, "peer events" },
71 { 'a', T_ADMIN, "admin interface" },
72 { 'p', T_PACKET, "packet contents" },
73 { 'c', T_CRYPTO, "crypto details" },
74 { 's', T_KEYSET, "symmetric keyset management" },
75 { 'x', T_KEYEXCH, "key exchange" },
76 { 'm', T_KEYMGMT, "key management" },
77 { 'A', T_ALL, "all of the above" },
81 unsigned tr_flags = 0;
84 /*----- Static variables --------------------------------------------------*/
88 static const char *sockname;
89 static unsigned flags = 0;
90 static admin *a_stdin = 0;
91 static sig s_term, s_int, s_hup;
96 #define T_RESOLVE SEC(30)
98 static void a_destroy(admin */*a*/);
99 static void a_lock(admin */*a*/);
100 static void a_unlock(admin */*a*/);
102 /*----- Output functions --------------------------------------------------*/
104 /* --- @trywrite@ --- *
106 * Arguments: @admin *a@ = pointer to an admin block
107 * @const char *p@ = pointer to buffer to write
108 * @size_t sz@ = size of data to write
110 * Returns: The number of bytes written, or less than zero on error.
112 * Use: Attempts to write data to a client.
115 static ssize_t trywrite(admin *a, const char *p, size_t sz)
122 n = write(a->w.fd, p, sz);
132 if (errno != EAGAIN && errno != EWOULDBLOCK) {
134 a_warn("disconnecting admin client due to write errors: %s",
142 /* --- @dosend@ --- *
144 * Arguemnts: @admin *a@ = pointer to an admin block
145 * @const char *p@ = pointer to buffer to write
146 * @size_t sz@ = size of data to write
150 * Use: Sends data to an admin client.
153 static void dosend(admin *a, const char *p, size_t sz)
161 /* --- Try to send the data immediately --- */
164 if ((n = trywrite(a, p, sz)) < 0)
172 /* --- Fill buffers with the data until it's all gone --- */
177 else if (o->p_in < o->buf + OBUFSZ)
181 o = xmalloc(sizeof(obuf));
183 o->p_in = o->p_out = o->buf;
191 n = o->buf + OBUFSZ - o->p_in;
194 memcpy(o->p_in, p, n);
201 /* --- @a_flush@ --- *
203 * Arguments: @int fd@ = file descriptor
204 * @unsigned mode@ = what's happening
205 * @void *v@ = pointer to my admin block
209 * Use: Flushes buffers when a client is ready to read again.
212 static void a_flush(int fd, unsigned mode, void *v)
220 if ((n = trywrite(a, o->p_out, o->p_in - o->p_out)) < 0)
223 if (o->p_in < o->p_out)
236 /*----- Utility functions -------------------------------------------------*/
238 /* --- @a_write@ --- *
240 * Arguments: @admin *a@ = admin connection to write to
241 * @const char *fmt@ = pointer to format string
242 * @...@ = other arguments
246 * Use: Sends a message to an admin connection.
249 static void a_write(admin *a, const char *fmt, ...)
254 dstr_vputf(&d, fmt, &ap);
256 dosend(a, d.buf, d.len);
260 /* --- @a_warn@ --- *
262 * Arguments: @const char *fmt@ = pointer to format string
263 * @...@ = other arguments
267 * Use: Informs all admin connections of a warning.
270 void a_warn(const char *fmt, ...)
277 dstr_puts(&d, "WARN ");
279 dstr_vputf(&d, fmt, ap);
281 if (!(flags & F_INIT))
285 for (a = admins; a; a = aa) {
287 dosend(a, d.buf, d.len);
293 /* --- @a_trace@ --- *
295 * Arguments: @const char *p@ = pointer to a buffer
296 * @size_t sz@ = size of the buffer
297 * @void *v@ = uninteresting pointer
301 * Use: Custom trace output handler.
305 static void a_trace(const char *p, size_t sz, void *v)
310 dstr_puts(&d, "TRACE ");
311 dstr_putm(&d, p, sz);
313 for (a = admins; a; a = aa) {
315 dosend(a, d.buf, d.len);
321 /* --- @a_quit@ --- *
327 * Use: Shuts things down nicely.
337 /* --- @a_sigdie@ --- *
339 * Arguments: @int sig@ = signal number
340 * @void *v@ = an uninteresting argument
344 * Use Shuts down on receipt of a fatal signal.
347 static void a_sigdie(int sig, void *v)
353 case SIGTERM: p = "SIGTERM"; break;
354 case SIGINT: p = "SIGINT"; break;
356 sprintf(buf, "signal %i", sig);
360 a_warn("shutting down on %s", p);
364 /* --- @a_sighup@ --- *
366 * Arguments: @int sig@ = signal number
367 * @void *v@ = an uninteresting argument
371 * Use Logs a message about SIGHUP not being useful.
374 static void a_sighup(int sig, void *v)
376 a_warn("received SIGHUP: ignoring");
379 /*----- Adding peers ------------------------------------------------------*/
381 /* --- @a_resolve@ --- *
383 * Arguments: @struct hostent *h@ = pointer to resolved hostname
384 * @void *v@ = pointer to admin block
388 * Use: Handles a completed name resolution.
391 static void a_resolve(struct hostent *h, void *v)
396 T( trace(T_ADMIN, "admin: %u resolved", a->seq); )
400 a_write(a, "FAIL couldn't resolve hostname `%s'\n", a->paddr);
401 else if (p_find(a->pname))
402 a_write(a, "FAIL peer `%s' already registered\n", a->pname);
404 memcpy(&a->peer.sin.sin_addr, h->h_addr, sizeof(struct in_addr));
405 if (!p_create(a->pname, &a->peer.sa, a->sasz))
406 a_write(a, "FAIL couldn't create peer\n");
413 selbuf_enable(&a->b);
417 /* --- @a_timer@ --- *
419 * Arguments: @struct timeval *tv@ = timer
420 * @void *v@ = pointer to admin block
424 * Use: Times out a resolver.
427 static void a_timer(struct timeval *tv, void *v)
432 T( trace(T_ADMIN, "admin: %u resolver timeout", a->seq); )
434 a_write(a, "FAIL timeout resolving `%s'\n", a->paddr);
438 selbuf_enable(&a->b);
442 /* --- @acmd_add@ --- *
444 * Arguments: @admin *a@ = connection which requested the addition
445 * @unsigned ac@ = argument count
446 * @char *av[]@ = pointer to the argument list
450 * Use: Adds a new peer.
453 static void acmd_add(admin *a, unsigned ac, char *av[])
459 /* --- Make sure someone's not got there already --- */
462 a_write(a, "FAIL peer `%s' already registered\n", av[0]);
466 /* --- Fill in the easy bits of address --- */
469 a->peer.sin.sin_family = AF_INET;
470 a->sasz = sizeof(a->peer.sin);
471 pt = strtoul(av[2], &p, 0);
473 struct servent *s = getservbyname(av[2], "udp");
475 a_write(a, "FAIL service `%s' not known\n", av[2]);
478 pt = ntohs(s->s_port);
480 if (pt == 0 || pt >= 65536) {
481 a_write(a, "FAIL bad port number %lu\n", pt);
484 a->peer.sin.sin_port = htons(pt);
486 /* --- If the name is numeric, do it the easy way --- */
488 if (inet_aton(av[1], &a->peer.sin.sin_addr)) {
489 if (!p_create(av[0], &a->peer.sa, a->sasz))
490 a_write(a, "FAIL couldn't create peer\n");
496 /* --- Store everything for later and crank up the resolver --- *
498 * We disable the line buffer until the resolver completes (or times out).
499 * This prevents other commands on the same connection (though the rest of
500 * the system continues regardless), but makes life simpler for the client.
503 a->pname = xstrdup(av[0]);
504 a->paddr = xstrdup(av[1]);
505 selbuf_disable(&a->b);
506 gettimeofday(&tv, 0);
507 tv.tv_sec += T_RESOLVE;
508 sel_addtimer(&sel, &a->t, &tv, a_timer, a);
509 bres_byname(&a->r, a->paddr, a_resolve, a);
510 T( trace(T_ADMIN, "admin: %u resolving hostname `%s'",
514 /*----- Administration commands -------------------------------------------*/
516 /* --- Miscellaneous commands --- */
520 static void acmd_trace(admin *a, unsigned ac, char *av[])
522 if (!ac || strcmp(av[0], "?") == 0) {
524 a_write(a, "INFO Trace options:\n");
525 for (t = tr_opts; t->ch; t++) {
526 a_write(a, "INFO %c %c %s\n",
527 t->ch, (tr_flags & t->f) == t->f ? '*' : ' ', t->help);
531 unsigned f = tr_flags;
537 case '+': sense = 1; break;
538 case '-': sense = 0; break;
540 for (tt = tr_opts; tt->ch; tt++) {
542 if (sense) f |= tt->f;
547 a_write(a, "FAIL unknown trace option `%c'\n", *p);
555 trace_level(tr_flags);
562 static void acmd_port(admin *a, unsigned ac, char *av[])
564 a_write(a, "INFO %u\nOK\n", p_port());
567 static void acmd_daemon(admin *a, unsigned ac, char *av[])
569 if (flags & F_DAEMON)
570 a_write(a, "FAIL already running as a daemon\n");
572 a_warn("becoming a daemon");
576 a_write(a, "FAIL error becoming a daemon: %s", strerror(errno));
584 static void acmd_list(admin *a, unsigned ac, char *av[])
587 for (p = p_first(); p; p = p_next(p))
588 a_write(a, "INFO %s\n", p_name(p));
592 static void acmd_ifname(admin *a, unsigned ac, char *av[])
596 if ((p = p_find(av[0])) == 0)
597 a_write(a, "FAIL peer `%s' not found\n", av[0]);
599 a_write(a, "INFO %s\nOK\n", p_ifname(p));
602 static void acmd_addr(admin *a, unsigned ac, char *av[])
607 if ((p = p_find(av[0])) == 0)
608 a_write(a, "FAIL peer `%s' not found\n", av[0]);
611 assert(ad->sa.sa_family == AF_INET);
612 a_write(a, "INFO %s %u\nOK\n",
613 inet_ntoa(ad->sin.sin_addr),
614 (unsigned)ntohs(ad->sin.sin_port));
618 static void acmd_stats(admin *a, unsigned ac, char *av[])
623 if ((p = p_find(av[0])) == 0)
624 a_write(a, "FAIL peer `%s' not found\n", av[0]);
627 a_write(a, "INFO start-time=%s\n", timestr(st->t_start));
628 a_write(a, "INFO last-packet-time=%s\n", timestr(st->t_last));
629 a_write(a, "INFO packets-in=%lu bytes-in=%lu\n", st->n_in, st->sz_in);
630 a_write(a, "INFO packets-out=%lu bytes-out=%lu\n",
631 st->n_out, st->sz_out);
632 a_write(a, "INFO keyexch-packets-in=%lu keyexch-bytes-in=%lu\n",
633 st->n_kxin, st->sz_kxin);
634 a_write(a, "INFO keyexch-packets-out=%lu keyexch-bytes-out=%lu\n",
635 st->n_kxout, st->sz_kxout);
636 a_write(a, "INFO ip-packets-in=%lu ip-bytes-in=%lu\n",
637 st->n_ipin, st->sz_ipin);
638 a_write(a, "INFO ip-packets-out=%lu ip-bytes-out=%lu\n",
639 st->n_ipout, st->sz_ipout);
640 a_write(a, "INFO rejected-packets=%lu\n", st->n_reject);
645 static void acmd_kill(admin *a, unsigned ac, char *av[])
648 if ((p = p_find(av[0])) == 0)
649 a_write(a, "FAIL peer `%s' not found\n", av[0]);
656 static void acmd_quit(admin *a, unsigned ac, char *av[])
658 a_warn("closing down on admin request");
663 /* --- The command table and help --- */
665 typedef struct acmd {
668 unsigned argmin, argmax;
669 void (*func)(admin */*a*/, unsigned /*ac*/, char */*av*/[]);
672 static void acmd_help(admin */*a*/, unsigned /*ac*/, char */*av*/[]);
674 static const acmd acmdtab[] = {
675 { "help", "HELP", 0, 0, acmd_help },
677 { "trace", "TRACE [options]", 0, 1, acmd_trace },
679 { "port", "PORT", 0, 0, acmd_port },
680 { "daemon", "DAEMON", 0, 0, acmd_daemon },
681 { "list", "LIST", 0, 0, acmd_list },
682 { "ifname", "IFNAME peer", 1, 1, acmd_ifname },
683 { "addr", "ADDR peer", 1, 1, acmd_addr },
684 { "stats", "STATS peer", 1, 1, acmd_stats },
685 { "kill", "KILL peer", 1, 1, acmd_kill },
686 { "add", "ADD peer addr port", 3, 3, acmd_add },
687 { "quit", "QUIT", 0, 0, acmd_quit },
691 static void acmd_help(admin *a, unsigned ac, char *av[])
694 for (c = acmdtab; c->name; c++)
695 a_write(a, "INFO %s\n", c->help);
699 /*----- Connection handling -----------------------------------------------*/
701 /* --- @a_lock@ --- *
703 * Arguments: @admin *a@ = pointer to an admin block
707 * Use: Locks an admin block so that it won't be destroyed
711 static void a_lock(admin *a) { assert(!(a->f & AF_LOCK)); a->f |= AF_LOCK; }
713 /* --- @a_unlock@ --- *
715 * Arguments: @admin *a@ = pointer to an admin block
719 * Use: Unlocks an admin block, allowing its destruction. This is
720 * also the second half of @a_destroy@.
723 static void a_unlock(admin *a)
725 assert(a->f & AF_LOCK);
726 if (!(a->f & AF_DEAD)) {
731 T( trace(T_ADMIN, "admin: completing destruction of connection %u",
734 selbuf_destroy(&a->b);
741 if (a->b.reader.fd != a->w.fd)
742 close(a->b.reader.fd);
748 a->next->prev = a->prev;
750 a->prev->next = a->next;
756 /* --- @a_destroy@ --- *
758 * Arguments: @admin *a@ = pointer to an admin block
762 * Use: Destroys an admin block. This requires a certain amount of
766 static void a_destroy(admin *a)
768 /* --- Don't multiply destroy admin blocks --- */
773 /* --- Make sure nobody expects it to work --- */
776 T( trace(T_ADMIN, "admin: destroying connection %u", a->seq); )
778 /* --- Free the output buffers --- */
783 for (o = a->o_head; o; o = oo) {
790 /* --- If the block is locked, that's all we can manage --- */
792 if (a->f & AF_LOCK) {
793 T( trace(T_ADMIN, "admin: deferring destruction..."); )
800 /* --- @a_line@ --- *
802 * Arguments: @char *p@ = pointer to the line read
803 * @size_t len@ = length of the line
804 * @void *vp@ = pointer to my admin block
808 * Use: Handles a line of input.
811 static void a_line(char *p, size_t len, void *vp)
825 ac = str_qsplit(p, av, 4, 0, STRF_QUOTE);
828 for (p = av[0]; *p; p++) *p = tolower((unsigned char)*p);
829 for (c = acmdtab; c->name; c++) {
830 if (strcmp(av[0], c->name) == 0) {
832 if (c->argmin > ac || ac > c->argmax)
833 a_write(a, "FAIL syntax: %s\n", c->help);
836 c->func(a, ac, av + 1);
842 a_write(a, "FAIL unknown command `%s'\n", av[0]);
845 /* --- @a_create@ --- *
847 * Arguments: @int fd_in, fd_out@ = file descriptors to use
851 * Use: Creates a new admin connection.
854 void a_create(int fd_in, int fd_out)
856 admin *a = CREATE(admin);
857 T( static unsigned seq = 0;
859 T( trace(T_ADMIN, "admin: accepted connection %u", a->seq); )
862 if (fd_in == STDIN_FILENO)
864 fdflags(fd_in, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
866 fdflags(fd_out, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
867 selbuf_init(&a->b, &sel, fd_in, a_line, a);
868 sel_initfile(&sel, &a->w, fd_out, SEL_WRITE, a_flush, a);
878 /* --- @a_accept@ --- *
880 * Arguments: @int fd@ = file descriptor to accept
881 * @unsigned mode@ = what to do
882 * @void *v@ = uninteresting pointer
886 * Use: Accepts a new admin connection.
889 static void a_accept(int fd, unsigned mode, void *v)
892 struct sockaddr_un sun;
893 size_t sz = sizeof(sun);
895 if ((nfd = accept(fd, (struct sockaddr *)&sun, &sz)) < 0) {
896 a_warn("accept admin connection failed: %s", strerror(errno));
902 /* --- @a_daemon@ --- *
908 * Use: Informs the admin module that it's a daemon.
916 /* --- @a_init@ --- *
918 * Arguments: @const char *name@ = socket name to create
922 * Use: Creates the admin listening socket.
925 void a_init(const char *name)
929 struct sockaddr_un sun;
933 /* --- Set up the socket address --- */
935 sz = strlen(name) + 1;
936 if (sz > sizeof(sun.sun_path))
937 die(EXIT_FAILURE, "socket name `%s' too long", name);
939 sun.sun_family = AF_UNIX;
940 memcpy(sun.sun_path, name, sz);
941 sz += offsetof(struct sockaddr_un, sun_path);
943 /* --- Attempt to bind to the socket --- */
947 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
948 die(EXIT_FAILURE, "couldn't create socket: %s", strerror(errno));
949 if (bind(fd, (struct sockaddr *)&sun, sz) < 0) {
952 if (errno != EADDRINUSE) {
953 die(EXIT_FAILURE, "couldn't bind to address `%s': %s",
954 sun.sun_path, strerror(e));
957 die(EXIT_FAILURE, "too many retries; giving up");
959 if (!connect(fd, (struct sockaddr *)&sun, sz)) {
960 die(EXIT_FAILURE, "server already listening on admin socket `%s'",
963 if (errno != ECONNREFUSED)
964 die(EXIT_FAILURE, "couldn't bind to address: %s", strerror(e));
965 if (stat(sun.sun_path, &st)) {
966 die(EXIT_FAILURE, "couldn't stat `%s': %s",
967 sun.sun_path, strerror(errno));
969 if (!S_ISSOCK(st.st_mode))
970 die(EXIT_FAILURE, "object `%s' isn't a socket", sun.sun_path);
971 T( trace(T_ADMIN, "admin: stale socket found; removing it"); )
972 unlink(sun.sun_path);
976 chmod(sun.sun_path, 0600);
977 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
979 die(EXIT_FAILURE, "couldn't listen on socket: %s", strerror(errno));
981 /* --- Listen to the socket --- */
983 sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0);
987 T( trace_custom(a_trace, 0);
988 trace(T_ADMIN, "admin: enabled custom tracing"); )
991 /* --- Set up signal handlers --- */
993 sig_add(&s_term, SIGTERM, a_sigdie, 0);
994 sig_add(&s_hup, SIGHUP, a_sighup, 0);
995 sigaction(SIGINT, 0, &sa);
996 if (sa.sa_handler != SIG_IGN)
997 sig_add(&s_int, SIGINT, a_sigdie, 0);
1000 /*----- That's all, folks -------------------------------------------------*/