/*%
* Destroy any finds. This can be used to "start over from scratch" and
* should only be called when events are _not_ being generated by the finds.
*/
static void
cleanup_gabn(ns_lwdclient_t *client) {
ns_lwdclient_log(50, "cleaning up client %p", client);
if (client->v6find != NULL) {
if (client->v6find == client->v4find)
client->v6find = NULL;
else
dns_adb_destroyfind(&client->v6find);
}
if (client->v4find != NULL)
dns_adb_destroyfind(&client->v4find);
}
static void
lookup_callback(isc_task_t *task, isc_event_t *ev) {
client_t *client;
client = ev->ev_arg;
INSIST(client->find == ev->ev_sender);
printf("NAME %s:\n\tTask %p got event %p type %08x from %p, client %p\n\terr4: %s err6: %s\n",
client->target,
task, ev, ev->ev_type, client->find, client,
isc_result_totext(client->find->result_v4),
isc_result_totext(client->find->result_v6));
isc_event_free(&ev);
ev = NULL;
CLOCK();
dns_adb_dumpfind(client->find, stderr);
dns_adb_destroyfind(&client->find);
ISC_LIST_UNLINK(clients, client, link);
free_client(&client);
CUNLOCK();
}
static void
do_find(isc_boolean_t want_event) {
isc_result_t result;
isc_boolean_t done = ISC_FALSE;
unsigned int options;
options = DNS_ADBFIND_INET | DNS_ADBFIND_INET6;
if (want_event)
options |= DNS_ADBFIND_WANTEVENT | DNS_ADBFIND_EMPTYEVENT;
dns_fixedname_init(&target);
result = dns_adb_createfind(view->adb, task, adb_callback, NULL,
dns_fixedname_name(&fixed),
dns_rootname, 0, options, 0,
dns_fixedname_name(&target), 0,
&find);
if (result == ISC_R_SUCCESS) {
if (!ISC_LIST_EMPTY(find->list)) {
/*
* We have at least some of the addresses for the
* name.
*/
INSIST((find->options & DNS_ADBFIND_WANTEVENT) == 0);
print_addresses(find);
done = ISC_TRUE;
} else {
/*
* We don't know any of the addresses for this
* name.
*/
if ((find->options & DNS_ADBFIND_WANTEVENT) == 0) {
/*
* And ADB isn't going to send us any events
* either. This query loses.
*/
done = ISC_TRUE;
}
/*
* If the DNS_ADBFIND_WANTEVENT flag was set, we'll
* get an event when something happens.
*/
}
} else if (result == DNS_R_ALIAS) {
print_name(dns_fixedname_name(&target));
done = ISC_TRUE;
} else {
printf("dns_adb_createfind() returned %s\n",
isc_result_totext(result));
done = ISC_TRUE;
}
if (done) {
if (find != NULL)
dns_adb_destroyfind(&find);
isc_app_shutdown();
}
}
static void
lookup(const char *target) {
dns_name_t name;
unsigned char namedata[256];
client_t *client;
isc_buffer_t t, namebuf;
isc_result_t result;
unsigned int options;
INSIST(target != NULL);
client = new_client();
isc_buffer_init(&t, target, strlen(target));
isc_buffer_add(&t, strlen(target));
isc_buffer_init(&namebuf, namedata, sizeof(namedata));
dns_name_init(&name, NULL);
result = dns_name_fromtext(&name, &t, dns_rootname, ISC_FALSE,
&namebuf);
check_result(result, "dns_name_fromtext %s", target);
result = dns_name_dup(&name, mctx, &client->name);
check_result(result, "dns_name_dup %s", target);
options = 0;
options |= DNS_ADBFIND_INET;
options |= DNS_ADBFIND_INET6;
options |= DNS_ADBFIND_WANTEVENT;
options |= DNS_ADBFIND_HINTOK;
options |= DNS_ADBFIND_GLUEOK;
result = dns_adb_createfind(adb, t2, lookup_callback, client,
&client->name, dns_rootname, options,
now, NULL, view->dstport, &client->find);
#if 0
check_result(result, "dns_adb_createfind()");
#endif
dns_adb_dumpfind(client->find, stderr);
if ((client->find->options & DNS_ADBFIND_WANTEVENT) != 0) {
client->target = target;
ISC_LIST_APPEND(clients, client, link);
} else {
printf("NAME %s: err4 %s, err6 %s\n",
target, isc_result_totext(client->find->result_v4),
isc_result_totext(client->find->result_v6));
dns_adb_destroyfind(&client->find);
free_client(&client);
}
}
static void
adb_callback(isc_task_t *etask, isc_event_t *event) {
unsigned int type = event->ev_type;
REQUIRE(etask == task);
isc_event_free(&event);
dns_adb_destroyfind(&find);
if (type == DNS_EVENT_ADBMOREADDRESSES)
do_find(ISC_FALSE);
else if (type == DNS_EVENT_ADBNOMOREADDRESSES) {
printf("no more addresses\n");
isc_app_shutdown();
} else {
printf("unexpected ADB event type %u\n", type);
isc_app_shutdown();
}
}
static void
restart_find(ns_lwdclient_t *client) {
unsigned int options;
isc_result_t result;
isc_boolean_t claimed;
ns_lwdclient_log(50, "starting find for client %p", client);
/*
* Issue a find for the name contained in the request. We won't
* set the bit that says "anything is good enough" -- we want it
* all.
*/
options = 0;
options |= DNS_ADBFIND_WANTEVENT;
options |= DNS_ADBFIND_RETURNLAME;
/*
* Set the bits up here to mark that we want this address family
* and that we do not currently have a find pending. We will
* set that bit again below if it turns out we will get an event.
*/
if (NEED_V4(client))
options |= DNS_ADBFIND_INET;
if (NEED_V6(client))
options |= DNS_ADBFIND_INET6;
find_again:
INSIST(client->find == NULL);
result = dns_adb_createfind(client->clientmgr->view->adb,
client->clientmgr->task,
process_gabn_finddone, client,
dns_fixedname_name(&client->target_name),
dns_rootname, 0, options, 0,
dns_fixedname_name(&client->target_name),
client->clientmgr->view->dstport,
&client->find);
/*
* Did we get an alias? If so, save it and re-issue the query.
*/
if (result == DNS_R_ALIAS) {
ns_lwdclient_log(50, "found alias, restarting query");
dns_adb_destroyfind(&client->find);
cleanup_gabn(client);
result = add_alias(client);
if (result != ISC_R_SUCCESS) {
ns_lwdclient_log(50,
"out of buffer space adding alias");
ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
return;
}
goto find_again;
}
ns_lwdclient_log(50, "find returned %d (%s)", result,
isc_result_totext(result));
/*
* Did we get an error?
*/
if (result != ISC_R_SUCCESS) {
if (client->find != NULL)
dns_adb_destroyfind(&client->find);
cleanup_gabn(client);
ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
return;
}
claimed = ISC_FALSE;
/*
* Did we get our answer to V4 addresses?
*/
if (NEED_V4(client)
&& ((client->find->query_pending & DNS_ADBFIND_INET) == 0)) {
ns_lwdclient_log(50, "client %p ipv4 satisfied by find %p",
client, client->find);
claimed = ISC_TRUE;
client->v4find = client->find;
}
/*
* Did we get our answer to V6 addresses?
*/
if (NEED_V6(client)
&& ((client->find->query_pending & DNS_ADBFIND_INET6) == 0)) {
ns_lwdclient_log(50, "client %p ipv6 satisfied by find %p",
client, client->find);
claimed = ISC_TRUE;
client->v6find = client->find;
}
/*
* If we're going to get an event, set our internal pending flag
* and return. When we get an event back we'll do the right
* thing, basically by calling this function again, perhaps with a
* new target name.
*
* If we have both v4 and v6, and we are still getting an event,
* we have a programming error, so die hard.
*/
if ((client->find->options & DNS_ADBFIND_WANTEVENT) != 0) {
ns_lwdclient_log(50, "event will be sent");
INSIST(client->v4find == NULL || client->v6find == NULL);
return;
}
ns_lwdclient_log(50, "no event will be sent");
if (claimed)
client->find = NULL;
else
dns_adb_destroyfind(&client->find);
/*
* We seem to have everything we asked for, or at least we are
* able to respond with things we've learned.
*/
generate_reply(client);
}
static void
process_gabn_finddone(isc_task_t *task, isc_event_t *ev) {
ns_lwdclient_t *client = ev->ev_arg;
isc_eventtype_t evtype;
isc_boolean_t claimed;
ns_lwdclient_log(50, "find done for task %p, client %p", task, client);
evtype = ev->ev_type;
isc_event_free(&ev);
/*
* No more info to be had? If so, we have all the good stuff
* right now, so we can render things.
*/
claimed = ISC_FALSE;
if (evtype == DNS_EVENT_ADBNOMOREADDRESSES) {
if (NEED_V4(client)) {
client->v4find = client->find;
claimed = ISC_TRUE;
}
if (NEED_V6(client)) {
client->v6find = client->find;
claimed = ISC_TRUE;
}
if (client->find != NULL) {
if (claimed)
client->find = NULL;
else
dns_adb_destroyfind(&client->find);
}
generate_reply(client);
return;
}
/*
* We probably don't need this find anymore. We're either going to
* reissue it, or an error occurred. Either way, we're done with
* it.
*/
if ((client->find != client->v4find)
&& (client->find != client->v6find)) {
dns_adb_destroyfind(&client->find);
} else {
client->find = NULL;
}
/*
* We have some new information we can gather. Run off and fetch
* it.
*/
if (evtype == DNS_EVENT_ADBMOREADDRESSES) {
restart_find(client);
return;
}
/*
* An error or other strangeness happened. Drop this query.
*/
cleanup_gabn(client);
ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
}
static void
generate_reply(ns_lwdclient_t *client) {
isc_result_t result;
int lwres;
isc_region_t r;
lwres_buffer_t lwb;
ns_lwdclientmgr_t *cm;
cm = client->clientmgr;
lwb.base = NULL;
ns_lwdclient_log(50, "generating gabn reply for client %p", client);
/*
* We must make certain the client->find is not still active.
* If it is either the v4 or v6 answer, just set it to NULL and
* let the cleanup code destroy it. Otherwise, destroy it now.
*/
if (client->find == client->v4find || client->find == client->v6find)
client->find = NULL;
else
if (client->find != NULL)
dns_adb_destroyfind(&client->find);
/*
* perhaps there are some here?
*/
if (NEED_V6(client) && client->v4find != NULL)
client->v6find = client->v4find;
/*
* Run through the finds we have and wire them up to the gabn
* structure.
*/
LWRES_LIST_INIT(client->gabn.addrs);
if (client->v4find != NULL)
setup_addresses(client, client->v4find, DNS_ADBFIND_INET);
if (client->v6find != NULL)
setup_addresses(client, client->v6find, DNS_ADBFIND_INET6);
/*
* If there are no addresses, try the next element in the search
* path, if there are any more. Otherwise, fall through into
* the error handling code below.
*/
if (client->gabn.naddrs == 0) {
do {
result = ns_lwsearchctx_next(&client->searchctx);
if (result == ISC_R_SUCCESS) {
cleanup_gabn(client);
result = start_find(client);
if (result == ISC_R_SUCCESS)
return;
}
} while (result == ISC_R_SUCCESS);
}
/*
* Render the packet.
*/
client->pkt.recvlength = LWRES_RECVLENGTH;
client->pkt.authtype = 0; /* XXXMLG */
client->pkt.authlength = 0;
/*
* If there are no addresses, return failure.
*/
if (client->gabn.naddrs != 0)
client->pkt.result = LWRES_R_SUCCESS;
else
client->pkt.result = LWRES_R_NOTFOUND;
sort_addresses(client);
lwres = lwres_gabnresponse_render(cm->lwctx, &client->gabn,
&client->pkt, &lwb);
if (lwres != LWRES_R_SUCCESS)
goto out;
r.base = lwb.base;
r.length = lwb.used;
client->sendbuf = r.base;
client->sendlength = r.length;
result = ns_lwdclient_sendreply(client, &r);
if (result != ISC_R_SUCCESS)
goto out;
NS_LWDCLIENT_SETSEND(client);
/*
* All done!
*/
cleanup_gabn(client);
return;
out:
cleanup_gabn(client);
if (lwb.base != NULL)
lwres_context_freemem(client->clientmgr->lwctx,
lwb.base, lwb.length);
ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
}