From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
Currently if the keepalive timer triggers, the 'markClose'
flag is set on the virNetClient. A controlled shutdown will
then be performed. If an I/O error occurs during read or
write of the connection an error is raised back to the
caller, but the connection isn't marked for close. This
patch ensures that all I/O error scenarios always result
in the connection being marked for close.
Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
---
src/rpc/virnetclient.c | 62 +++++++++++++++++++++++++++++++++++++++---------
1 file changed, 51 insertions(+), 11 deletions(-)
diff --git a/src/rpc/virnetclient.c b/src/rpc/virnetclient.c
index f877934..33d4209 100644
--- a/src/rpc/virnetclient.c
+++ b/src/rpc/virnetclient.c
@@ -101,6 +101,7 @@ struct _virNetClient {
virKeepAlivePtr keepalive;
bool wantClose;
+ int closeReason;
};
@@ -108,6 +109,8 @@ static void virNetClientIOEventLoopPassTheBuck(virNetClientPtr client,
virNetClientCallPtr thiscall);
static int virNetClientQueueNonBlocking(virNetClientPtr client,
virNetMessagePtr msg);
+static void virNetClientCloseInternal(virNetClientPtr client,
+ int reason);
static void virNetClientLock(virNetClientPtr client)
@@ -261,7 +264,7 @@ virNetClientKeepAliveStop(virNetClientPtr client)
static void
virNetClientKeepAliveDeadCB(void *opaque)
{
- virNetClientClose(opaque);
+ virNetClientCloseInternal(opaque, VIR_CONNECT_CLOSE_REASON_KEEPALIVE);
}
static int
@@ -484,16 +487,26 @@ void virNetClientFree(virNetClientPtr client)
static void
+virNetClientMarkClose(virNetClientPtr client,
+ int reason)
+{
+ VIR_DEBUG("client=%p, reason=%d", client, reason);
+ virNetSocketRemoveIOCallback(client->sock);
+ client->wantClose = true;
+ client->closeReason = reason;
+}
+
+
+static void
virNetClientCloseLocked(virNetClientPtr client)
{
virKeepAlivePtr ka;
- VIR_DEBUG("client=%p, sock=%p", client, client->sock);
+ VIR_DEBUG("client=%p, sock=%p, reason=%d", client, client->sock, client->closeReason);
if (!client->sock)
return;
- virNetSocketRemoveIOCallback(client->sock);
virNetSocketFree(client->sock);
client->sock = NULL;
virNetTLSSessionFree(client->tls);
@@ -518,16 +531,21 @@ virNetClientCloseLocked(virNetClientPtr client)
}
}
-void virNetClientClose(virNetClientPtr client)
+static void virNetClientCloseInternal(virNetClientPtr client,
+ int reason)
{
VIR_DEBUG("client=%p", client);
if (!client)
return;
+ if (!client->sock ||
+ client->wantClose)
+ return;
+
virNetClientLock(client);
- client->wantClose = true;
+ virNetClientMarkClose(client, reason);
/* If there is a thread polling for data on the socket, wake the thread up
* otherwise try to pass the buck to a possibly waiting thread. If no
@@ -548,6 +566,12 @@ void virNetClientClose(virNetClientPtr client)
}
+void virNetClientClose(virNetClientPtr client)
+{
+ virNetClientCloseInternal(client, VIR_CONNECT_CLOSE_REASON_CLIENT);
+}
+
+
#if HAVE_SASL
void virNetClientSetSASLSession(virNetClientPtr client,
virNetSASLSessionPtr sasl)
@@ -1351,7 +1375,7 @@ static int virNetClientIOEventLoop(virNetClientPtr client,
}
if (virKeepAliveTrigger(client->keepalive, &msg)) {
- client->wantClose = true;
+ virNetClientMarkClose(client, VIR_CONNECT_CLOSE_REASON_KEEPALIVE);
} else if (msg && virNetClientQueueNonBlocking(client, msg) < 0) {
VIR_WARN("Could not queue keepalive request");
virNetMessageFree(msg);
@@ -1374,18 +1398,23 @@ static int virNetClientIOEventLoop(virNetClientPtr client,
if (saferead(client->wakeupReadFD, &ignore, sizeof(ignore)) != sizeof(ignore)) {
virReportSystemError(errno, "%s",
_("read on wakeup fd failed"));
+ virNetClientMarkClose(client, VIR_CONNECT_CLOSE_REASON_ERROR);
goto error;
}
}
if (fds[0].revents & POLLOUT) {
- if (virNetClientIOHandleOutput(client) < 0)
+ if (virNetClientIOHandleOutput(client) < 0) {
+ virNetClientMarkClose(client, VIR_CONNECT_CLOSE_REASON_ERROR);
goto error;
+ }
}
if (fds[0].revents & POLLIN) {
- if (virNetClientIOHandleInput(client) < 0)
+ if (virNetClientIOHandleInput(client) < 0) {
+ virNetClientMarkClose(client, VIR_CONNECT_CLOSE_REASON_ERROR);
goto error;
+ }
}
/* Iterate through waiting calls and if any are
@@ -1410,6 +1439,7 @@ static int virNetClientIOEventLoop(virNetClientPtr client,
}
if (fds[0].revents & (POLLHUP | POLLERR)) {
+ virNetClientMarkClose(client, VIR_CONNECT_CLOSE_REASON_EOF);
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("received hangup / error event on socket"));
goto error;
@@ -1441,6 +1471,9 @@ static void virNetClientIOUpdateCallback(virNetClientPtr client,
{
int events = 0;
+ if (client->wantClose)
+ return;
+
if (enableCallback) {
events |= VIR_EVENT_HANDLE_READABLE;
virNetClientCallMatchPredicate(client->waitDispatch,
@@ -1623,6 +1656,8 @@ void virNetClientIncomingEvent(virNetSocketPtr sock,
virNetClientLock(client);
+ VIR_DEBUG("client=%p wantclose=%d", client, client ? client->wantClose : false);
+
if (!client->sock)
goto done;
@@ -1635,18 +1670,21 @@ void virNetClientIncomingEvent(virNetSocketPtr sock,
if (events & (VIR_EVENT_HANDLE_HANGUP | VIR_EVENT_HANDLE_ERROR)) {
VIR_DEBUG("%s : VIR_EVENT_HANDLE_HANGUP or "
"VIR_EVENT_HANDLE_ERROR encountered", __FUNCTION__);
- virNetSocketRemoveIOCallback(sock);
+ virNetClientMarkClose(client,
+ (events & VIR_EVENT_HANDLE_HANGUP) ?
+ VIR_CONNECT_CLOSE_REASON_EOF :
+ VIR_CONNECT_CLOSE_REASON_ERROR);
goto done;
}
if (events & VIR_EVENT_HANDLE_WRITABLE) {
if (virNetClientIOHandleOutput(client) < 0)
- virNetSocketRemoveIOCallback(sock);
+ virNetClientMarkClose(client, VIR_CONNECT_CLOSE_REASON_ERROR);
}
if (events & VIR_EVENT_HANDLE_READABLE) {
if (virNetClientIOHandleInput(client) < 0)
- virNetSocketRemoveIOCallback(sock);
+ virNetClientMarkClose(client, VIR_CONNECT_CLOSE_REASON_ERROR);
}
/* Remove completed calls or signal their threads. */
@@ -1656,6 +1694,8 @@ void virNetClientIncomingEvent(virNetSocketPtr sock,
virNetClientIOUpdateCallback(client, true);
done:
+ if (client->wantClose)
+ virNetClientCloseLocked(client);
virNetClientUnlock(client);
}
--
1.7.10.4
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