[libvirt] [PATCH v3 38/48] remote: open secondary drivers via remote driver if needed
Daniel P. Berrangé
berrange at redhat.com
Mon Jul 29 17:11:20 UTC 2019
When the client has a connection to one of the hypervisor specific
daemons (eg virtqemud), the app may still expect to use the secondary
driver APIs (storage, network, etc). None of these will be registered in
the hypervisor daemon, so we must explicitly open a connection to each
of the daemons for the secondary drivers we need.
We don't want to open these secondary driver connections at the same
time as the primary connection is opened though. That would mean that
establishing a connection to virtqemud would immediately trigger
activation of virtnetworkd, virnwfilterd, etc despite that that these
drivers may never be used by the app.
Thus we only open the secondary driver connections at time of first use
by an API call.
Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
src/remote/remote_daemon.h | 13 +++
src/remote/remote_daemon_dispatch.c | 162 ++++++++++++++++++++++------
2 files changed, 145 insertions(+), 30 deletions(-)
diff --git a/src/remote/remote_daemon.h b/src/remote/remote_daemon.h
index a403d2593a..a2d9af4036 100644
--- a/src/remote/remote_daemon.h
+++ b/src/remote/remote_daemon.h
@@ -70,12 +70,25 @@ struct daemonClientPrivate {
* called, it will be set back to NULL if that succeeds.
*/
virConnectPtr conn;
+
+ /* These secondary drivers may point back to 'conn'
+ * in the monolithic daemon setups. Otherwise they
+ * can be NULL and opened on first use, pointing
+ * to remote driver use of an external daemon
+ */
virConnectPtr interfaceConn;
+ const char *interfaceURI;
virConnectPtr networkConn;
+ const char *networkURI;
virConnectPtr nodedevConn;
+ const char *nodedevURI;
virConnectPtr nwfilterConn;
+ const char *nwfilterURI;
virConnectPtr secretConn;
+ const char *secretURI;
virConnectPtr storageConn;
+ const char *storageURI;
+ bool readonly;
daemonClientStreamPtr streams;
};
diff --git a/src/remote/remote_daemon_dispatch.c b/src/remote/remote_daemon_dispatch.c
index 5609eb4caf..8c11bb3f6c 100644
--- a/src/remote/remote_daemon_dispatch.c
+++ b/src/remote/remote_daemon_dispatch.c
@@ -1941,6 +1941,33 @@ static void remoteClientCloseFunc(virNetServerClientPtr client)
}
+static int
+remoteOpenConn(const char *uri,
+ bool readonly,
+ virConnectPtr *conn)
+{
+ VIR_DEBUG("Getting secondary uri=%s readonly=%d conn=%p",
+ NULLSTR(uri), readonly, conn);
+ if (*conn)
+ return 0;
+
+ if (!uri) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("connection not open"));
+ return -1;
+ }
+
+ VIR_DEBUG("Opening driver %s", uri);
+ if (readonly)
+ *conn = virConnectOpenReadOnly(uri);
+ else
+ *conn = virConnectOpen(uri);
+ if (!*conn)
+ return -1;
+ VIR_DEBUG("Opened driver %p", *conn);
+ return 0;
+}
+
+
static virConnectPtr
remoteGetHypervisorConn(virNetServerClientPtr client)
{
@@ -1962,10 +1989,10 @@ remoteGetInterfaceConn(virNetServerClientPtr client)
struct daemonClientPrivate *priv =
virNetServerClientGetPrivateData(client);
- if (!priv->interfaceConn) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("hypervisor connection not open"));
+ if (remoteOpenConn(priv->interfaceURI,
+ priv->readonly,
+ &priv->interfaceConn) < 0)
return NULL;
- }
return priv->interfaceConn;
}
@@ -1977,10 +2004,10 @@ remoteGetNetworkConn(virNetServerClientPtr client)
struct daemonClientPrivate *priv =
virNetServerClientGetPrivateData(client);
- if (!priv->networkConn) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("hypervisor connection not open"));
+ if (remoteOpenConn(priv->networkURI,
+ priv->readonly,
+ &priv->networkConn) < 0)
return NULL;
- }
return priv->networkConn;
}
@@ -1992,10 +2019,10 @@ remoteGetNodeDevConn(virNetServerClientPtr client)
struct daemonClientPrivate *priv =
virNetServerClientGetPrivateData(client);
- if (!priv->nodedevConn) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("hypervisor connection not open"));
+ if (remoteOpenConn(priv->nodedevURI,
+ priv->readonly,
+ &priv->nodedevConn) < 0)
return NULL;
- }
return priv->nodedevConn;
}
@@ -2007,10 +2034,10 @@ remoteGetNWFilterConn(virNetServerClientPtr client)
struct daemonClientPrivate *priv =
virNetServerClientGetPrivateData(client);
- if (!priv->nwfilterConn) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("hypervisor connection not open"));
+ if (remoteOpenConn(priv->nwfilterURI,
+ priv->readonly,
+ &priv->nwfilterConn) < 0)
return NULL;
- }
return priv->nwfilterConn;
}
@@ -2022,10 +2049,10 @@ remoteGetSecretConn(virNetServerClientPtr client)
struct daemonClientPrivate *priv =
virNetServerClientGetPrivateData(client);
- if (!priv->secretConn) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("hypervisor connection not open"));
+ if (remoteOpenConn(priv->secretURI,
+ priv->readonly,
+ &priv->secretConn) < 0)
return NULL;
- }
return priv->secretConn;
}
@@ -2037,10 +2064,10 @@ remoteGetStorageConn(virNetServerClientPtr client)
struct daemonClientPrivate *priv =
virNetServerClientGetPrivateData(client);
- if (!priv->storageConn) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("hypervisor connection not open"));
+ if (remoteOpenConn(priv->storageURI,
+ priv->readonly,
+ &priv->storageConn) < 0)
return NULL;
- }
return priv->storageConn;
}
@@ -2077,6 +2104,9 @@ remoteDispatchConnectOpen(virNetServerPtr server ATTRIBUTE_UNUSED,
unsigned int flags;
struct daemonClientPrivate *priv = virNetServerClientGetPrivateData(client);
int rv = -1;
+#ifndef LIBVIRTD
+ const char *type = NULL;
+#endif
VIR_DEBUG("priv=%p conn=%p", priv, priv->conn);
virMutexLock(&priv->lock);
@@ -2095,20 +2125,88 @@ remoteDispatchConnectOpen(virNetServerPtr server ATTRIBUTE_UNUSED,
if (virNetServerClientGetReadonly(client))
flags |= VIR_CONNECT_RO;
- priv->conn =
- flags & VIR_CONNECT_RO
- ? virConnectOpenReadOnly(name)
- : virConnectOpen(name);
+ priv->readonly = flags & VIR_CONNECT_RO;
- if (priv->conn == NULL)
+ VIR_DEBUG("Opening driver %s", name);
+ if (priv->readonly) {
+ if (!(priv->conn = virConnectOpenReadOnly(name)))
+ goto cleanup;
+ } else {
+ if (!(priv->conn = virConnectOpen(name)))
+ goto cleanup;
+ }
+ VIR_DEBUG("Opened %p", priv->conn);
+
+#ifndef LIBVIRTD
+ if (!(type = virConnectGetType(priv->conn)))
+ goto cleanup;
+
+ VIR_DEBUG("Primary driver type is '%s'", type);
+ if (STREQ(type, "QEMU") ||
+ STREQ(type, "LIBXL") ||
+ STREQ(type, "LXC") ||
+ STREQ(type, "VBOX") ||
+ STREQ(type, "bhyve") ||
+ STREQ(type, "vz") ||
+ STREQ(type, "Parallels")) {
+ VIR_DEBUG("Hypervisor driver found, setting URIs for secondary drivers");
+ if (getuid() == 0) {
+ priv->interfaceURI = "interface:///system";
+ priv->networkURI = "network:///system";
+ priv->nodedevURI = "nodedev:///system";
+ priv->nwfilterURI = "nwfilter:///system";
+ priv->secretURI = "secret:///system";
+ priv->storageURI = "storage:///system";
+ } else {
+ priv->interfaceURI = "interface:///session";
+ priv->networkURI = "network:///session";
+ priv->nodedevURI = "nodedev:///session";
+ /* No nwfilterURI as this is a root-only driver */
+ priv->secretURI = "secret:///session";
+ priv->storageURI = "storage:///session";
+ }
+ } else if (STREQ(type, "interface")) {
+ VIR_DEBUG("Interface driver found");
+ priv->interfaceConn = virObjectRef(priv->conn);
+ } else if (STREQ(type, "network")) {
+ VIR_DEBUG("Network driver found");
+ priv->networkConn = virObjectRef(priv->conn);
+ } else if (STREQ(type, "nodedev")) {
+ VIR_DEBUG("Nodedev driver found");
+ priv->nodedevConn = virObjectRef(priv->conn);
+ } else if (STREQ(type, "nwfilter")) {
+ VIR_DEBUG("NWFilter driver found");
+ priv->nwfilterConn = virObjectRef(priv->conn);
+ } else if (STREQ(type, "secret")) {
+ VIR_DEBUG("Secret driver found");
+ priv->secretConn = virObjectRef(priv->conn);
+ } else if (STREQ(type, "storage")) {
+ VIR_DEBUG("Storage driver found");
+ priv->storageConn = virObjectRef(priv->conn);
+
+ /* Co-open the secret driver, as apps using the storage driver may well
+ * need access to secrets for storage auth
+ */
+ if (getuid() == 0)
+ priv->secretURI = "secret:///system";
+ else
+ priv->secretURI = "secret:///session";
+ } else if (STREQ(type, "remote")) {
+#endif /* !LIBVIRTD */
+ VIR_DEBUG("Pointing secondary drivers to primary");
+ priv->interfaceConn = virObjectRef(priv->conn);
+ priv->networkConn = virObjectRef(priv->conn);
+ priv->nodedevConn = virObjectRef(priv->conn);
+ priv->nwfilterConn = virObjectRef(priv->conn);
+ priv->secretConn = virObjectRef(priv->conn);
+ priv->storageConn = virObjectRef(priv->conn);
+#ifndef LIBVIRTD
+ } else {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Unexpected driver type '%s' opened"), type);
goto cleanup;
-
- priv->interfaceConn = virObjectRef(priv->conn);
- priv->networkConn = virObjectRef(priv->conn);
- priv->nodedevConn = virObjectRef(priv->conn);
- priv->nwfilterConn = virObjectRef(priv->conn);
- priv->secretConn = virObjectRef(priv->conn);
- priv->storageConn = virObjectRef(priv->conn);
+ }
+#endif /* !LIBVIRTD */
/* force update the @readonly attribute which was inherited from the
* virNetServerService object - this is important for sockets that are RW
@@ -2120,6 +2218,10 @@ remoteDispatchConnectOpen(virNetServerPtr server ATTRIBUTE_UNUSED,
cleanup:
if (rv < 0)
virNetMessageSaveError(rerr);
+ if (priv->conn) {
+ virObjectUnref(priv->conn);
+ priv->conn = NULL;
+ }
virMutexUnlock(&priv->lock);
return rv;
}
--
2.21.0
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