/*
* Read data until we get a complete message to process
*/
static void virNetServerClientDispatchRead(virNetServerClientPtr client)
{
readmore:
if (client->rx->nfds == 0) {
if (virNetServerClientRead(client) < 0) {
client->wantClose = true;
return; /* Error */
}
}
if (client->rx->bufferOffset < client->rx->bufferLength)
return; /* Still not read enough */
/* Either done with length word header */
if (client->rx->bufferLength == VIR_NET_MESSAGE_LEN_MAX) {
if (virNetMessageDecodeLength(client->rx) < 0) {
client->wantClose = true;
return;
}
virNetServerClientUpdateEvent(client);
/* Try and read payload immediately instead of going back
into poll() because chances are the data is already
waiting for us */
goto readmore;
} else {
/* Grab the completed message */
virNetMessagePtr msg = client->rx;
virNetMessagePtr response = NULL;
virNetServerClientFilterPtr filter;
size_t i;
/* Decode the header so we can use it for routing decisions */
if (virNetMessageDecodeHeader(msg) < 0) {
virNetMessageFree(msg);
client->wantClose = true;
return;
}
/* Now figure out if we need to read more data to get some
* file descriptors */
if (msg->header.type == VIR_NET_CALL_WITH_FDS &&
virNetMessageDecodeNumFDs(msg) < 0) {
virNetMessageFree(msg);
client->wantClose = true;
return; /* Error */
}
/* Try getting the file descriptors (may fail if blocking) */
for (i = msg->donefds ; i < msg->nfds ; i++) {
int rv;
if ((rv = virNetSocketRecvFD(client->sock, &(msg->fds[i]))) < 0) {
virNetMessageFree(msg);
client->wantClose = true;
return;
}
if (rv == 0) /* Blocking */
break;
msg->donefds++;
}
/* Need to poll() until FDs arrive */
if (msg->donefds < msg->nfds) {
/* Because DecodeHeader/NumFDs reset bufferOffset, we
* put it back to what it was, so everything works
* again next time we run this method
*/
client->rx->bufferOffset = client->rx->bufferLength;
return;
}
/* Definitely finished reading, so remove from queue */
virNetMessageQueueServe(&client->rx);
PROBE(RPC_SERVER_CLIENT_MSG_RX,
"client=%p len=%zu prog=%u vers=%u proc=%u type=%u status=%u serial=%u",
client, msg->bufferLength,
msg->header.prog, msg->header.vers, msg->header.proc,
msg->header.type, msg->header.status, msg->header.serial);
if (virKeepAliveCheckMessage(client->keepalive, msg, &response)) {
virNetMessageFree(msg);
client->nrequests--;
msg = NULL;
if (response &&
virNetServerClientSendMessageLocked(client, response) < 0)
virNetMessageFree(response);
}
/* Maybe send off for queue against a filter */
if (msg) {
filter = client->filters;
while (filter) {
int ret = filter->func(client, msg, filter->opaque);
if (ret < 0) {
virNetMessageFree(msg);
msg = NULL;
if (ret < 0)
client->wantClose = true;
break;
}
if (ret > 0) {
msg = NULL;
break;
}
filter = filter->next;
}
}
/* Send off to for normal dispatch to workers */
if (msg) {
virObjectRef(client);
if (!client->dispatchFunc ||
client->dispatchFunc(client, msg, client->dispatchOpaque) < 0) {
virNetMessageFree(msg);
client->wantClose = true;
virObjectUnref(client);
return;
}
}
/* Possibly need to create another receive buffer */
if (client->nrequests < client->nrequests_max) {
if (!(client->rx = virNetMessageNew(true))) {
client->wantClose = true;
} else {
client->rx->bufferLength = VIR_NET_MESSAGE_LEN_MAX;
if (VIR_ALLOC_N(client->rx->buffer,
client->rx->bufferLength) < 0) {
virReportOOMError();
client->wantClose = true;
} else {
client->nrequests++;
}
}
}
virNetServerClientUpdateEvent(client);
}
}
static ssize_t
virNetClientIOHandleInput(virNetClientPtr client)
{
/* Read as much data as is available, until we get
* EAGAIN
*/
for (;;) {
ssize_t ret;
if (client->msg.nfds == 0) {
ret = virNetClientIOReadMessage(client);
if (ret < 0)
return -1;
if (ret == 0)
return 0; /* Blocking on read */
}
/* Check for completion of our goal */
if (client->msg.bufferOffset == client->msg.bufferLength) {
if (client->msg.bufferOffset == 4) {
ret = virNetMessageDecodeLength(&client->msg);
if (ret < 0)
return -1;
/*
* We'll carry on around the loop to immediately
* process the message body, because it has probably
* already arrived. Worst case, we'll get EAGAIN on
* next iteration.
*/
} else {
if (virNetMessageDecodeHeader(&client->msg) < 0)
return -1;
if (client->msg.header.type == VIR_NET_REPLY_WITH_FDS) {
size_t i;
if (virNetMessageDecodeNumFDs(&client->msg) < 0)
return -1;
for (i = client->msg.donefds ; i < client->msg.nfds ; i++) {
int rv;
if ((rv = virNetSocketRecvFD(client->sock, &(client->msg.fds[i]))) < 0)
return -1;
if (rv == 0) /* Blocking */
break;
client->msg.donefds++;
}
if (client->msg.donefds < client->msg.nfds) {
/* Because DecodeHeader/NumFDs reset bufferOffset, we
* put it back to what it was, so everything works
* again next time we run this method
*/
client->msg.bufferOffset = client->msg.bufferLength;
return 0; /* Blocking on more fds */
}
}
ret = virNetClientCallDispatch(client);
client->msg.bufferOffset = client->msg.bufferLength = 0;
/*
* We've completed one call, but we don't want to
* spin around the loop forever if there are many
* incoming async events, or replies for other
* thread's RPC calls. We want to get out & let
* any other thread take over as soon as we've
* got our reply. When SASL is active though, we
* may have read more data off the wire than we
* initially wanted & cached it in memory. In this
* case, poll() would not detect that there is more
* ready todo.
*
* So if SASL is active *and* some SASL data is
* already cached, then we'll process that now,
* before returning.
*/
if (ret == 0 &&
virNetSocketHasCachedData(client->sock))
continue;
return ret;
}
}
}
}