3 * $Id: admin.c,v 1.6 2001/02/19 19:11:09 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 1.6 2001/02/19 19:11:09 mdw
33 * Output buffering on admin connections.
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
40 * Revision 1.4 2001/02/06 09:34:53 mdw
41 * Change ERR response to FAIL for consistency with other programs.
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.
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.
52 * Revision 1.1 2001/02/03 20:26:37 mdw
57 /*----- Header files ------------------------------------------------------*/
61 /*----- Global variables --------------------------------------------------*/
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" },
78 unsigned tr_flags = 0;
81 /*----- Static variables --------------------------------------------------*/
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;
93 #define T_RESOLVE SEC(30)
95 static void a_destroy(admin */*a*/);
96 static void a_lock(admin */*a*/);
97 static void a_unlock(admin */*a*/);
99 /*----- Output functions --------------------------------------------------*/
101 /* --- @trywrite@ --- *
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
107 * Returns: The number of bytes written, or less than zero on error.
109 * Use: Attempts to write data to a client.
112 static ssize_t trywrite(admin *a, const char *p, size_t sz)
119 n = write(a->w.fd, p, sz);
129 if (errno != EAGAIN && errno != EWOULDBLOCK) {
131 a_warn("disconnecting admin client due to write errors: %s",
139 /* --- @dosend@ --- *
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
147 * Use: Sends data to an admin client.
150 static void dosend(admin *a, const char *p, size_t sz)
158 /* --- Try to send the data immediately --- */
161 if ((n = trywrite(a, p, sz)) < 0)
169 /* --- Fill buffers with the data until it's all gone --- */
174 else if (o->p_in < o->buf + OBUFSZ)
178 o = xmalloc(sizeof(obuf));
180 o->p_in = o->p_out = o->buf;
188 n = o->buf + OBUFSZ - o->p_in;
191 memcpy(o->p_in, p, n);
198 /* --- @a_flush@ --- *
200 * Arguments: @int fd@ = file descriptor
201 * @unsigned mode@ = what's happening
202 * @void *v@ = pointer to my admin block
206 * Use: Flushes buffers when a client is ready to read again.
209 static void a_flush(int fd, unsigned mode, void *v)
217 if ((n = trywrite(a, o->p_out, o->p_in - o->p_out)) < 0)
220 if (o->p_in < o->p_out)
233 /*----- Utility functions -------------------------------------------------*/
235 /* --- @a_write@ --- *
237 * Arguments: @admin *a@ = admin connection to write to
238 * @const char *fmt@ = pointer to format string
239 * @...@ = other arguments
243 * Use: Sends a message to an admin connection.
246 static void a_write(admin *a, const char *fmt, ...)
251 dstr_vputf(&d, fmt, ap);
253 dosend(a, d.buf, d.len);
257 /* --- @a_warn@ --- *
259 * Arguments: @const char *fmt@ = pointer to format string
260 * @...@ = other arguments
264 * Use: Informs all admin connections of a warning.
267 void a_warn(const char *fmt, ...)
274 dstr_puts(&d, "WARN ");
276 dstr_vputf(&d, fmt, ap);
278 if (!(flags & F_INIT))
282 for (a = admins; a; a = aa) {
284 dosend(a, d.buf, d.len);
290 /* --- @a_trace@ --- *
292 * Arguments: @const char *p@ = pointer to a buffer
293 * @size_t sz@ = size of the buffer
294 * @void *v@ = uninteresting pointer
298 * Use: Custom trace output handler.
302 static void a_trace(const char *p, size_t sz, void *v)
307 dstr_puts(&d, "TRACE ");
308 dstr_putm(&d, p, sz);
310 for (a = admins; a; a = aa) {
312 dosend(a, d.buf, d.len);
318 /* --- @a_quit@ --- *
324 * Use: Shuts things down nicely.
334 /* --- @a_sigdie@ --- *
336 * Arguments: @int sig@ = signal number
337 * @void *v@ = an uninteresting argument
341 * Use Shuts down on receipt of a fatal signal.
344 static void a_sigdie(int sig, void *v)
350 case SIGTERM: p = "SIGTERM"; break;
351 case SIGINT: p = "SIGINT"; break;
353 sprintf(buf, "signal %i", sig);
357 a_warn("shutting down on %s", p);
361 /* --- @a_sighup@ --- *
363 * Arguments: @int sig@ = signal number
364 * @void *v@ = an uninteresting argument
368 * Use Logs a message about SIGHUP not being useful.
371 static void a_sighup(int sig, void *v)
373 a_warn("received SIGHUP: ignoring");
376 /*----- Adding peers ------------------------------------------------------*/
378 /* --- @a_resolve@ --- *
380 * Arguments: @struct hostent *h@ = pointer to resolved hostname
381 * @void *v@ = pointer to admin block
385 * Use: Handles a completed name resolution.
388 static void a_resolve(struct hostent *h, void *v)
393 T( trace(T_ADMIN, "admin: %u resolved", a->seq); )
397 a_write(a, "FAIL couldn't resolve hostname `%s'\n", a->paddr);
398 else if (p_find(a->pname))
399 a_write(a, "FAIL peer `%s' already registered\n", a->pname);
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))
403 a_write(a, "FAIL couldn't create peer\n");
410 selbuf_enable(&a->b);
414 /* --- @a_timer@ --- *
416 * Arguments: @struct timeval *tv@ = timer
417 * @void *v@ = pointer to admin block
421 * Use: Times out a resolver.
424 static void a_timer(struct timeval *tv, void *v)
429 T( trace(T_ADMIN, "admin: %u resolver timeout", a->seq); )
431 a_write(a, "FAIL timeout resolving `%s'\n", a->paddr);
435 selbuf_enable(&a->b);
439 /* --- @acmd_add@ --- *
441 * Arguments: @admin *a@ = connection which requested the addition
442 * @unsigned ac@ = argument count
443 * @char *av[]@ = pointer to the argument list
447 * Use: Adds a new peer.
450 static void acmd_add(admin *a, unsigned ac, char *av[])
456 /* --- Make sure someone's not got there already --- */
459 a_write(a, "FAIL peer `%s' already registered\n", av[0]);
463 /* --- Fill in the easy bits of address --- */
466 a->peer.sin.sin_family = AF_INET;
467 a->sasz = sizeof(a->peer.sin);
468 pt = strtoul(av[2], &p, 0);
470 struct servent *s = getservbyname(av[2], "udp");
472 a_write(a, "FAIL service `%s' not known\n", av[2]);
475 pt = ntohs(s->s_port);
477 if (pt == 0 || pt >= 65536) {
478 a_write(a, "FAIL bad port number %lu\n", pt);
481 a->peer.sin.sin_port = htons(pt);
483 /* --- If the name is numeric, do it the easy way --- */
485 if (inet_aton(av[1], &a->peer.sin.sin_addr)) {
486 if (!p_create(av[0], &a->peer.sa, a->sasz))
487 a_write(a, "FAIL couldn't create peer\n");
493 /* --- Store everything for later and crank up the resolver --- *
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.
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'",
511 /*----- Administration commands -------------------------------------------*/
513 /* --- Miscellaneous commands --- */
517 static void acmd_trace(admin *a, unsigned ac, char *av[])
519 if (!ac || strcmp(av[0], "?") == 0) {
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);
528 unsigned f = tr_flags;
534 case '+': sense = 1; break;
535 case '-': sense = 0; break;
537 for (tt = tr_opts; tt->ch; tt++) {
539 if (sense) f |= tt->f;
544 a_write(a, "FAIL unknown trace option `%c'\n", *p);
552 trace_level(tr_flags);
559 static void acmd_port(admin *a, unsigned ac, char *av[])
561 a_write(a, "INFO %u\nOK\n", p_port());
564 static void acmd_daemon(admin *a, unsigned ac, char *av[])
566 if (flags & F_DAEMON)
567 a_write(a, "FAIL already running as a daemon\n");
569 a_warn("becoming a daemon");
573 a_write(a, "FAIL error becoming a daemon: %s", strerror(errno));
581 static void acmd_list(admin *a, unsigned ac, char *av[])
584 for (p = p_first(); p; p = p_next(p))
585 a_write(a, "INFO %s\n", p_name(p));
589 static void acmd_ifname(admin *a, unsigned ac, char *av[])
593 if ((p = p_find(av[0])) == 0)
594 a_write(a, "FAIL peer `%s' not found\n", av[0]);
596 a_write(a, "INFO %s\nOK\n", p_ifname(p));
599 static void acmd_addr(admin *a, unsigned ac, char *av[])
604 if ((p = p_find(av[0])) == 0)
605 a_write(a, "FAIL peer `%s' not found\n", av[0]);
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));
615 static void acmd_stats(admin *a, unsigned ac, char *av[])
620 if ((p = p_find(av[0])) == 0)
621 a_write(a, "FAIL peer `%s' not found\n", av[0]);
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);
642 static void acmd_kill(admin *a, unsigned ac, char *av[])
645 if ((p = p_find(av[0])) == 0)
646 a_write(a, "FAIL peer `%s' not found\n", av[0]);
653 static void acmd_quit(admin *a, unsigned ac, char *av[])
655 a_warn("closing down on admin request");
660 /* --- The command table and help --- */
662 typedef struct acmd {
665 unsigned argmin, argmax;
666 void (*func)(admin */*a*/, unsigned /*ac*/, char */*av*/[]);
669 static void acmd_help(admin */*a*/, unsigned /*ac*/, char */*av*/[]);
671 static const acmd acmdtab[] = {
672 { "help", "HELP", 0, 0, acmd_help },
674 { "trace", "TRACE [options]", 0, 1, acmd_trace },
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 },
681 { "stats", "STATS peer", 1, 1, acmd_stats },
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 },
688 static void acmd_help(admin *a, unsigned ac, char *av[])
691 for (c = acmdtab; c->name; c++)
692 a_write(a, "INFO %s\n", c->help);
696 /*----- Connection handling -----------------------------------------------*/
698 /* --- @a_lock@ --- *
700 * Arguments: @admin *a@ = pointer to an admin block
704 * Use: Locks an admin block so that it won't be destroyed
708 static void a_lock(admin *a) { assert(!(a->f & AF_LOCK)); a->f |= AF_LOCK; }
710 /* --- @a_unlock@ --- *
712 * Arguments: @admin *a@ = pointer to an admin block
716 * Use: Unlocks an admin block, allowing its destruction. This is
717 * also the second half of @a_destroy@.
720 static void a_unlock(admin *a)
722 assert(a->f & AF_LOCK);
723 if (!(a->f & AF_DEAD)) {
728 T( trace(T_ADMIN, "admin: completing destruction of connection %u",
731 selbuf_destroy(&a->b);
738 if (a->b.reader.fd != a->w.fd)
739 close(a->b.reader.fd);
745 a->next->prev = a->prev;
747 a->prev->next = a->next;
753 /* --- @a_destroy@ --- *
755 * Arguments: @admin *a@ = pointer to an admin block
759 * Use: Destroys an admin block. This requires a certain amount of
763 static void a_destroy(admin *a)
765 /* --- Don't multiply destroy admin blocks --- */
770 /* --- Make sure nobody expects it to work --- */
773 T( trace(T_ADMIN, "admin: destroying connection %u", a->seq); )
775 /* --- Free the output buffers --- */
780 for (o = a->o_head; o; o = oo) {
787 /* --- If the block is locked, that's all we can manage --- */
789 if (a->f & AF_LOCK) {
790 T( trace(T_ADMIN, "admin: deferring destruction..."); )
797 /* --- @a_line@ --- *
799 * Arguments: @char *p@ = pointer to the line read
800 * @void *vp@ = pointer to my admin block
804 * Use: Handles a line of input.
807 static void a_line(char *p, void *vp)
821 ac = str_qsplit(p, av, 4, 0, STRF_QUOTE);
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) {
828 if (c->argmin > ac || ac > c->argmax)
829 a_write(a, "FAIL syntax: %s\n", c->help);
832 c->func(a, ac, av + 1);
838 a_write(a, "FAIL unknown command `%s'\n", av[0]);
841 /* --- @a_create@ --- *
843 * Arguments: @int fd_in, fd_out@ = file descriptors to use
847 * Use: Creates a new admin connection.
850 void a_create(int fd_in, int fd_out)
852 admin *a = CREATE(admin);
853 T( static unsigned seq = 0;
855 T( trace(T_ADMIN, "admin: accepted connection %u", a->seq); )
858 if (fd_in == STDIN_FILENO)
860 fdflags(fd_in, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
862 fdflags(fd_out, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
863 selbuf_init(&a->b, &sel, fd_in, a_line, a);
864 sel_initfile(&sel, &a->w, fd_out, SEL_WRITE, a_flush, a);
874 /* --- @a_accept@ --- *
876 * Arguments: @int fd@ = file descriptor to accept
877 * @unsigned mode@ = what to do
878 * @void *v@ = uninteresting pointer
882 * Use: Accepts a new admin connection.
885 static void a_accept(int fd, unsigned mode, void *v)
888 struct sockaddr_un sun;
889 size_t sz = sizeof(sun);
891 if ((nfd = accept(fd, (struct sockaddr *)&sun, &sz)) < 0) {
892 a_warn("accept admin connection failed: %s", strerror(errno));
898 /* --- @a_daemon@ --- *
904 * Use: Informs the admin module that it's a daemon.
912 /* --- @a_init@ --- *
914 * Arguments: @const char *name@ = socket name to create
918 * Use: Creates the admin listening socket.
921 void a_init(const char *name)
925 struct sockaddr_un sun;
929 /* --- Set up the socket address --- */
931 sz = strlen(name) + 1;
932 if (sz > sizeof(sun.sun_path))
933 die(EXIT_FAILURE, "socket name `%s' too long", name);
935 sun.sun_family = AF_UNIX;
936 memcpy(sun.sun_path, name, sz);
937 sz += offsetof(struct sockaddr_un, sun_path);
939 /* --- Attempt to bind to the socket --- */
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) {
948 if (errno != EADDRINUSE) {
949 die(EXIT_FAILURE, "couldn't bind to address `%s': %s",
950 sun.sun_path, strerror(e));
953 die(EXIT_FAILURE, "too many retries; giving up");
955 if (!connect(fd, (struct sockaddr *)&sun, sz)) {
956 die(EXIT_FAILURE, "server already listening on admin socket `%s'",
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));
965 if (!S_ISSOCK(st.st_mode))
966 die(EXIT_FAILURE, "object `%s' isn't a socket", sun.sun_path);
967 T( trace(T_ADMIN, "admin: stale socket found; removing it"); )
968 unlink(sun.sun_path);
972 chmod(sun.sun_path, 0600);
973 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
975 die(EXIT_FAILURE, "couldn't listen on socket: %s", strerror(errno));
977 /* --- Listen to the socket --- */
979 sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0);
983 T( trace_custom(a_trace, 0);
984 trace(T_ADMIN, "admin: enabled custom tracing"); )
987 /* --- Set up signal handlers --- */
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);
996 /*----- That's all, folks -------------------------------------------------*/