void
ns_lwdclient_send(isc_task_t *task, isc_event_t *ev) {
ns_lwdclient_t *client = ev->ev_arg;
ns_lwdclientmgr_t *cm = client->clientmgr;
isc_socketevent_t *dev = (isc_socketevent_t *)ev;
UNUSED(task);
UNUSED(dev);
INSIST(NS_LWDCLIENT_ISSEND(client));
INSIST(client->sendbuf == dev->region.base);
ns_lwdclient_log(50, "task %p for client %p got send-done event",
task, client);
if (client->sendbuf != client->buffer)
lwres_context_freemem(cm->lwctx, client->sendbuf,
client->sendlength);
client->sendbuf = NULL;
client->sendlength = 0;
ns_lwdclient_stateidle(client);
isc_event_free(&ev);
}
void
ns_lwdclient_recv(isc_task_t *task, isc_event_t *ev) {
isc_result_t result;
ns_lwdclient_t *client = ev->ev_arg;
ns_lwdclientmgr_t *cm = client->clientmgr;
isc_socketevent_t *dev = (isc_socketevent_t *)ev;
INSIST(dev->region.base == client->buffer);
INSIST(NS_LWDCLIENT_ISRECV(client));
NS_LWDCLIENT_SETRECVDONE(client);
LOCK(&cm->lock);
INSIST((cm->flags & NS_LWDCLIENTMGR_FLAGRECVPENDING) != 0);
cm->flags &= ~NS_LWDCLIENTMGR_FLAGRECVPENDING;
UNLOCK(&cm->lock);
ns_lwdclient_log(50,
"event received: task %p, length %u, result %u (%s)",
task, dev->n, dev->result,
isc_result_totext(dev->result));
if (dev->result != ISC_R_SUCCESS) {
isc_event_free(&ev);
dev = NULL;
/*
* Go idle.
*/
ns_lwdclient_stateidle(client);
return;
}
client->recvlength = dev->n;
client->address = dev->address;
if ((dev->attributes & ISC_SOCKEVENTATTR_PKTINFO) != 0) {
client->pktinfo = dev->pktinfo;
client->pktinfo_valid = ISC_TRUE;
} else
client->pktinfo_valid = ISC_FALSE;
isc_event_free(&ev);
dev = NULL;
result = ns_lwdclient_startrecv(cm);
if (result != ISC_R_SUCCESS)
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_LWRESD, ISC_LOG_ERROR,
"could not start lwres "
"client handler: %s",
isc_result_totext(result));
process_request(client);
}
/*%
* Generate an error packet for the client, schedule a send, and put us in
* the SEND state.
*
* The client->pkt structure will be modified to form an error return.
* The receiver needs to verify that it is in fact an error, and do the
* right thing with it. The opcode will be unchanged. The result needs
* to be set before calling this function.
*
* The only change this code makes is to set the receive buffer size to the
* size we use, set the reply bit, and recompute any security information.
*/
void
ns_lwdclient_errorpktsend(ns_lwdclient_t *client, isc_uint32_t _result) {
isc_result_t result;
int lwres;
isc_region_t r;
lwres_buffer_t b;
REQUIRE(NS_LWDCLIENT_ISRUNNING(client));
/*
* Since we are only sending the packet header, we can safely toss
* the receive buffer. This means we won't need to allocate space
* for sending an error reply. This is a Good Thing.
*/
client->pkt.length = LWRES_LWPACKET_LENGTH;
client->pkt.pktflags |= LWRES_LWPACKETFLAG_RESPONSE;
client->pkt.recvlength = LWRES_RECVLENGTH;
client->pkt.authtype = 0; /* XXXMLG */
client->pkt.authlength = 0;
client->pkt.result = _result;
lwres_buffer_init(&b, client->buffer, LWRES_RECVLENGTH);
lwres = lwres_lwpacket_renderheader(&b, &client->pkt);
if (lwres != LWRES_R_SUCCESS) {
ns_lwdclient_stateidle(client);
return;
}
r.base = client->buffer;
r.length = b.used;
client->sendbuf = client->buffer;
result = ns_lwdclient_sendreply(client, &r);
if (result != ISC_R_SUCCESS) {
ns_lwdclient_stateidle(client);
return;
}
NS_LWDCLIENT_SETSEND(client);
}
static void
process_request(ns_lwdclient_t *client) {
lwres_buffer_t b;
isc_result_t result;
lwres_buffer_init(&b, client->buffer, client->recvlength);
lwres_buffer_add(&b, client->recvlength);
result = lwres_lwpacket_parseheader(&b, &client->pkt);
if (result != ISC_R_SUCCESS) {
ns_lwdclient_log(50, "invalid packet header received");
goto restart;
}
ns_lwdclient_log(50, "opcode %08x", client->pkt.opcode);
switch (client->pkt.opcode) {
case LWRES_OPCODE_GETADDRSBYNAME:
ns_lwdclient_processgabn(client, &b);
return;
case LWRES_OPCODE_GETNAMEBYADDR:
ns_lwdclient_processgnba(client, &b);
return;
case LWRES_OPCODE_GETRDATABYNAME:
ns_lwdclient_processgrbn(client, &b);
return;
case LWRES_OPCODE_NOOP:
ns_lwdclient_processnoop(client, &b);
return;
default:
ns_lwdclient_log(50, "unknown opcode %08x", client->pkt.opcode);
goto restart;
}
/*
* Drop the packet.
*/
restart:
ns_lwdclient_log(50, "restarting client %p...", client);
ns_lwdclient_stateidle(client);
}