/*----- Static variables --------------------------------------------------*/
+#ifdef HAVE_LIBADNS
+ static adns_state ads;
+ sel_hook hook;
+#endif
static admin *admins;
static admin *a_dead;
static sel_file sock;
-static const char *sockname;
+static const char *sockname = 0;
static sym_table a_svcs;
static unsigned flags = 0;
static admin *a_stdin = 0;
} else if (*fmt == '?') {
if (strcmp(fmt, "?ADDR") == 0) {
const addr *a = va_arg(*ap, const addr *);
- switch (a->sa.sa_family) {
- case AF_INET:
- u_quotify(d, "INET");
- u_quotify(d, inet_ntoa(a->sin.sin_addr));
- dstr_putf(d, " %u", (unsigned)ntohs(a->sin.sin_port));
- break;
- default:
- abort();
+ char name[NI_MAXHOST], serv[NI_MAXSERV];
+ int ix, err;
+ if ((err = getnameinfo(&a->sa, addrsz(a),
+ name, sizeof(name), serv, sizeof(serv),
+ (NI_NUMERICHOST | NI_NUMERICSERV |
+ NI_DGRAM)))) {
+ dstr_putf(d, " E%d", err);
+ u_quotify(d, gai_strerror(err));
+ } else {
+ ix = afix(a->sa.sa_family); assert(ix >= 0);
+ u_quotify(d, aftab[ix].name);
+ u_quotify(d, name);
+ u_quotify(d, serv);
}
} else if (strcmp(fmt, "?B64") == 0) {
const octet *p = va_arg(*ap, const octet *);
void a_quit(void)
{
close(sock.fd);
- unlink(sockname);
- FOREACH_PEER(p, { p_destroy(p); });
+ if (sockname) unlink(sockname);
+ FOREACH_PEER(p, { p_destroy(p, 1); });
ps_quit();
exit(0);
}
/*----- Name resolution operations ----------------------------------------*/
+#ifdef HAVE_LIBADNS
+
+/* --- @before_select@ --- *
+ *
+ * Arguments: @sel_state *s@ = the @sel@ multiplexor (unused)
+ * @sel_args *a@ = input to @select@, to be updated
+ * @void *p@ = a context pointer (unused)
+ *
+ * Returns: ---
+ *
+ * Use: An I/O multiplexor hook, called just before waiting for I/O
+ * events.
+ *
+ * Currently its main purpose is to wire ADNS into the event
+ * loop.
+ */
+
+static void before_select(sel_state *s, sel_args *a, void *p)
+{
+ struct timeval now;
+ adns_query q;
+ adns_answer *n;
+ admin_resop *r;
+ int any = 0;
+
+ /* --- Check for name-resolution progress --- *
+ *
+ * If there is any, then clobber the timeout: one of the resolver
+ * callbacks might have renewed its interest in a file descriptor, but too
+ * late to affect this @select@ call.
+ *
+ * I think, strictly, this is an mLib bug, but it's cheap enough to hack
+ * around here. Fixing it will wait for mLib 3.
+ */
+
+ for (;;) {
+ q = 0;
+ if (adns_check(ads, &q, &n, &p)) break;
+ r = p;
+ any = 1;
+ if (n->status != adns_s_ok) {
+ T( trace(T_ADMIN, "admin: resop %s failed: %s",
+ BGTAG(r), adns_strerror(n->status)); )
+ a_bgfail(&r->bg, "resolve-error", "%s", r->addr, A_END);
+ r->func(r, ARES_FAIL);
+ } else {
+ T( trace(T_ADMIN, "admin: resop %s ok", BGTAG(r)); )
+ assert(n->type == adns_r_addr);
+ assert(n->nrrs > 0);
+ assert(n->rrs.addr[0].len <= sizeof(r->sa));
+ memcpy(&r->sa, &n->rrs.addr[0].addr, n->rrs.addr[0].len);
+ setport(&r->sa, r->port);
+ r->func(r, ARES_OK);
+ }
+ free(n);
+ sel_rmtimer(&r->t);
+ xfree(r->addr);
+ a_bgrelease(&r->bg);
+ }
+
+ if (any) { a->tvp = &a->tv; a->tv.tv_sec = 0; a->tv.tv_usec = 0; }
+
+ gettimeofday(&now, 0);
+ adns_beforeselect(ads, &a->maxfd,
+ &a->fd[SEL_READ], &a->fd[SEL_WRITE], &a->fd[SEL_EXC],
+ &a->tvp, &a->tv, &now);
+}
+
+/* --- @after_select@ --- *
+ *
+ * Arguments: @sel_state *s@ = the @sel@ multiplexor (unused)
+ * @sel_args *a@ = input to @select@, to be updated
+ * @void *p@ = a context pointer (unused)
+ *
+ * Returns: ---
+ *
+ * Use: An I/O multiplexor hook, called just after waiting for I/O
+ * events.
+ *
+ * Currently its main purpose is to wire ADNS into the event
+ * loop.
+ */
+
+static void after_select(sel_state *s, sel_args *a, void *p)
+{
+ struct timeval now;
+
+ gettimeofday(&now, 0);
+ adns_afterselect(ads, a->maxfd,
+ &a->fd[SEL_READ], &a->fd[SEL_WRITE], &a->fd[SEL_EXC],
+ &now);
+}
+
+#else
+
/* --- @a_resolved@ --- *
*
* Arguments: @struct hostent *h@ = pointer to resolved hostname
a_bgrelease(&r->bg);
}
+#endif
+
/* --- @a_restimer@ --- *
*
* Arguments: @struct timeval *tv@ = timer
T( trace(T_ADMIN, "admin: resop %s timeout", BGTAG(r)); )
a_bgfail(&r->bg, "resolver-timeout", "%s", r->addr, A_END);
r->func(r, ARES_FAIL);
+#ifdef HAVE_LIBADNS
+ adns_cancel(r->q);
+#else
bres_abort(&r->r);
+#endif
xfree(r->addr);
a_bgrelease(&r->bg);
}
r->func(r, ARES_FAIL);
sel_rmtimer(&r->t);
xfree(r->addr);
+#ifdef HAVE_LIBADNS
+ adns_cancel(r->q);
+#else
bres_abort(&r->r);
+#endif
}
/* --- @a_resolve@ --- *
{
struct timeval tv;
unsigned long pt;
+ int af = AF_UNSPEC;
+ const char *fam = "ANY";
char *p;
- int i = 0;
+ int i = 0, j;
+ struct addrinfo *ai, *ailist, aihint = { 0 };
+#ifdef HAVE_LIBADNS
+ int err;
+ adns_queryflags qf;
+#endif
/* --- Fill in the easy bits of address --- */
r->bg.tag = "<starting>";
r->addr = 0;
r->func = func;
- if (mystrieq(av[i], "inet")) i++;
+ if (mystrieq(av[i], "any"))
+ { fam = "ANY"; af = AF_UNSPEC; i++; }
+ else for (j = 0; j < NADDRFAM; j++) {
+ if (mystrieq(av[i], aftab[j].name)) {
+ if (udpsock[j].sf.fd < 0) {
+ a_fail(a, "disabled-address-family", "%s", aftab[j].name, A_END);
+ goto fail;
+ }
+ fam = aftab[j].name;
+ af = aftab[j].af;
+ i++;
+ break;
+ }
+ }
if (ac - i != 1 && ac - i != 2) {
- a_fail(a, "bad-addr-syntax", "[inet] ADDRESS [PORT]", A_END);
+ a_fail(a, "bad-addr-syntax", "[FAMILY] ADDRESS [PORT]", A_END);
goto fail;
}
r->addr = xstrdup(av[i]);
if (a_bgadd(a, &r->bg, tag, a_rescancel))
goto fail;
- T( trace(T_ADMIN, "admin: %u, resop %s, hostname `%s'",
- a->seq, BGTAG(r), r->addr); )
+ T( trace(T_ADMIN, "admin: %u, resop %s, hostname `%s', family `%s'",
+ a->seq, BGTAG(r), r->addr, fam); )
/* --- If the name is numeric, do it the easy way --- */
- if (inet_aton(av[i], &r->sa.sin.sin_addr)) {
- T( trace(T_ADMIN, "admin: resop %s done the easy way", BGTAG(r)); )
- r->sa.sin.sin_family = AF_INET;
- setport(&r->sa, r->port);
- func(r, ARES_OK);
+ aihint.ai_family = af;
+ aihint.ai_socktype = SOCK_DGRAM;
+ aihint.ai_protocol = IPPROTO_UDP;
+ aihint.ai_flags = AI_NUMERICHOST;
+ if (!getaddrinfo(av[i], 0, &aihint, &ailist)) {
+ for (ai = ailist; ai; ai = ai->ai_next) {
+ if ((j = afix(ai->ai_family)) >= 0 && udpsock[j].sf.fd >= 0)
+ break;
+ }
+ if (!ai) {
+ T( trace(T_ADMIN, "admin: resop %s failed: "
+ "no suitable addresses returned", BGTAG(r)); )
+ a_bgfail(&r->bg, "resolve-error", "%s" , r->addr, A_END);
+ func(r, ARES_FAIL);
+ } else {
+ T( trace(T_ADMIN, "admin: resop %s done the easy way", BGTAG(r)); )
+ assert(ai->ai_addrlen <= sizeof(r->sa));
+ memcpy(&r->sa, ai->ai_addr, ai->ai_addrlen);
+ setport(&r->sa, r->port);
+ func(r, ARES_OK);
+ }
+ freeaddrinfo(ailist);
xfree(r->addr);
a_bgrelease(&r->bg);
return;
gettimeofday(&tv, 0);
tv.tv_sec += T_RESOLVE;
sel_addtimer(&sel, &r->t, &tv, a_restimer, r);
+#ifdef HAVE_LIBADNS
+ qf = adns_qf_search;
+ for (j = 0; j < NADDRFAM; j++) {
+ if ((af == AF_UNSPEC || af == aftab[i].af) && udpsock[j].sf.fd >= 0)
+ qf |= aftab[j].qf;
+ }
+ if ((err = adns_submit(ads, r->addr, adns_r_addr, qf, r, &r->q)) != 0) {
+ T( trace(T_ADMIN, "admin: resop %s adns_submit failed: %s",
+ BGTAG(r), strerror(err)); )
+ a_bgfail(&r->bg, "resolve-error", "%s", r->addr, A_END);
+ goto fail_release;
+ }
+#else
+ if (af != AF_UNSPEC && af != AF_INET) {
+ T( trace(T_ADMIN, "admin: resop %s failed: unsupported address family",
+ BGTAG(r)); )
+ a_bgfail(&r->bg, "resolve-error", "%s", r->addr, A_END);
+ goto fail_release;
+ }
+ if (udpsock[AFIX_INET].sf.fd < 0) {
+ a_bgfail(&r->bg, "disabled-address-family", "INET", A_END);
+ goto fail_release;
+ }
bres_byname(&r->r, r->addr, a_resolved, r);
+#endif
return;
fail:
func(r, ARES_FAIL);
if (r->addr) xfree(r->addr);
xfree(r);
+ return;
+
+fail_release:
+ func(r, ARES_FAIL);
+ xfree(r->addr);
+ a_bgrelease(&r->bg);
}
/*----- Option parsing ----------------------------------------------------*/
if (add->peer.tag) xfree(add->peer.tag);
if (add->peer.privtag) xfree(add->peer.privtag);
+ if (add->peer.knock) xfree(add->peer.knock);
xfree(add->peer.name);
}
add->peer.name = 0;
add->peer.tag = 0;
add->peer.privtag = 0;
+ add->peer.knock = 0;
add->peer.t_ka = 0;
add->peer.tops = tun_default;
add->peer.f = 0;
})
OPTTIME("-keepalive", t, { add->peer.t_ka = t; })
OPT("-cork", { add->peer.f |= KXF_CORK; })
+ OPT("-ephemeral", { add->peer.f |= PSF_EPHEM; })
OPTARG("-key", arg, {
if (add->peer.tag) xfree(add->peer.tag);
add->peer.tag = xstrdup(arg);
})
- OPT("-mobile", { add->peer.f |= PSF_MOBILE; })
+ OPT("-mobile", { add->peer.f |= PSF_MOBILE | PSF_EPHEM; })
OPTARG("-priv", arg, {
if (add->peer.privtag) xfree(add->peer.privtag);
add->peer.privtag = xstrdup(arg);
})
+ OPTARG("-knock", arg, {
+ if (add->peer.knock) xfree(add->peer.knock);
+ add->peer.knock = xstrdup(arg);
+ add->peer.f |= PSF_EPHEM;
+ })
});
/* --- Make sure someone's not got there already --- */
if (add->peer.name) xfree(add->peer.name);
if (add->peer.tag) xfree(add->peer.tag);
if (add->peer.privtag) xfree(add->peer.privtag);
+ if (add->peer.knock) xfree(add->peer.knock);
xfree(add);
return;
}
a_fail(a, "unknown-address-family", "%s", av[0], A_END);
return;
found:
- assert(udpsock[i].fd >= 0);
+ if (udpsock[i].sf.fd < 0) {
+ a_fail(a, "disabled-address-family", "%s", aftab[i].name, A_END);
+ return;
+ }
} else {
for (i = 0; i < NADDRFAM; i++)
- if (udpsock[i].fd >= 0) goto found;
+ if (udpsock[i].sf.fd >= 0) goto found;
abort();
}
- a_info(a, "%u", p_port(i), A_END);
+ a_info(a, "%u", udpsock[i].port, A_END);
a_ok(a);
}
buf b;
buf_init(&b, buf_i, PKBUFSZ);
- c_new(&b);
+ c_new(0, 0, &b);
a_info(a, "?B64", BBASE(&b), (size_t)BLEN(&b), A_END);
a_ok(a);
}
a_fail(a, "bad-base64", "%s", codec_strerror(err), A_END);
else {
buf_init(&b, d.buf, d.len);
- if (c_check(&b) || BBAD(&b) || BLEFT(&b))
+ if (c_check(0, 0, &b) || BBAD(&b) || BLEFT(&b))
a_fail(a, "invalid-challenge", A_END);
else
a_ok(a);
if ((p = a_findpeer(a, av[0])) != 0) {
ps = p_spec(p);
a_info(a, "tunnel=%s", ps->tops->name, A_END);
+ if (ps->knock) a_info(a, "knock=%s", ps->knock, A_END);
a_info(a, "key=%s", p_tag(p),
"current-key=%s", p->kx.kpub->tag, A_END);
if ((ptag = p_privtag(p)) == 0) ptag = "(default)";
a_info(a, "keepalive=%lu", ps->t_ka, A_END);
a_info(a, "corked=%s", BOOL(p->kx.f&KXF_CORK),
"mobile=%s", BOOL(ps->f&PSF_MOBILE),
+ "ephemeral=%s", BOOL(ps->f&PSF_EPHEM),
A_END);
a_ok(a);
}
peer *p;
if ((p = a_findpeer(a, av[0])) != 0) {
- p_destroy(p);
+ p_destroy(p, 1);
a_ok(a);
}
}
*
* Returns: ---
*
- * Use: Creates a new admin connection.
+ * Use: Creates a new admin connection. It's safe to call this
+ * before @a_init@ -- and, indeed, this makes sense if you also
+ * call @a_switcherr@ to report initialization errors through
+ * the administration machinery.
*/
void a_create(int fd_in, int fd_out, unsigned f)
void a_daemon(void) { flags |= F_DAEMON; }
-/* --- @a_init@ --- *
+/* --- @a_listen@ --- *
*
* Arguments: @const char *name@ = socket name to create
* @uid_t u@ = user to own the socket
* Use: Creates the admin listening socket.
*/
-void a_init(const char *name, uid_t u, gid_t g, mode_t m)
+void a_listen(const char *name, uid_t u, gid_t g, mode_t m)
{
int fd;
int n = 5;
struct sockaddr_un sun;
- struct sigaction sa;
size_t sz;
mode_t omask;
- /* --- Create services table --- */
-
- sym_create(&a_svcs);
-
/* --- Set up the socket address --- */
sz = strlen(name) + 1;
sel_initfile(&sel, &sock, fd, SEL_READ, a_accept, 0);
sel_addfile(&sock);
sockname = name;
- bres_init(&sel);
+}
+
+/* --- @a_switcherr@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Arrange to report warnings, trace messages, etc. to
+ * administration clients rather than the standard-error stream.
+ *
+ * Obviously this makes no sense unless there is at least one
+ * client established. Calling @a_listen@ won't help with this,
+ * because the earliest a new client can connect is during the
+ * first select-loop iteration, which is too late: some initial
+ * client must have been added manually using @a_create@.
+ */
+
+void a_switcherr(void)
+{
T( trace_custom(a_trace, 0);
trace(T_ADMIN, "admin: enabled custom tracing"); )
flags |= F_INIT;
+}
+
+/* --- @a_signals@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Establishes handlers for the obvious signals.
+ */
- /* --- Set up signal handlers --- */
+void a_signals(void)
+{
+ struct sigaction sa;
sig_add(&s_term, SIGTERM, a_sigdie, 0);
sig_add(&s_hup, SIGHUP, a_sighup, 0);
sig_add(&s_int, SIGINT, a_sigdie, 0);
}
+/* --- @a_init@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: ---
+ *
+ * Use: Creates the admin listening socket.
+ */
+
+void a_init(void)
+{
+#ifdef HAVE_LIBADNS
+ int err;
+#endif
+
+ /* --- Create services table --- */
+
+ sym_create(&a_svcs);
+
+ /* --- Prepare the background name resolver --- */
+
+#ifdef HAVE_LIBADNS
+ if ((err = adns_init(&ads,
+ (adns_if_permit_ipv4 | adns_if_permit_ipv6 |
+ adns_if_noserverwarn | adns_if_nosigpipe |
+ adns_if_noautosys),
+ 0)) != 0)
+ die(EXIT_FAILURE, "failed to initialize ADNS: %s", strerror(errno));
+ sel_addhook(&sel, &hook, before_select, after_select, 0);
+#else
+ bres_init(&sel);
+#endif
+}
+
/*----- That's all, folks -------------------------------------------------*/
~mdw / tripe / blobdiff