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[libvirt] [PATCH 1/8] Introduce the virDomainOpenGraphics API



From: "Daniel P. Berrange" <berrange redhat com>

The virDomainOpenGraphics API allows a libvirt client to pass in
a file descriptor for an open socket pair, and get it connected
to the graphics display of the guest. This is limited to working
with local libvirt hypervisors conencted over a UNIX domain
socket, since it will use UNIX FD passing

* include/libvirt/libvirt.h.in: Define virDomainOpenGraphics
* src/driver.h: Define driver for virDomainOpenGraphics
* src/libvirt_public.syms, src/libvirt.c: Entry point for
  virDomainOpenGraphics
---
 include/libvirt/libvirt.h.in |    9 ++++++
 src/driver.h                 |    6 ++++
 src/libvirt.c                |   66 ++++++++++++++++++++++++++++++++++++++++++
 src/libvirt_public.syms      |    1 +
 4 files changed, 82 insertions(+), 0 deletions(-)

diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index 361881a..daf8f6a 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -3104,6 +3104,15 @@ int virDomainOpenConsole(virDomainPtr dom,
                          virStreamPtr st,
                          unsigned int flags);
 
+typedef enum {
+    VIR_DOMAIN_OPEN_GRAPHICS_SKIPAUTH = (1 << 0),
+} virDomainOpenGraphicsFlags;
+
+int virDomainOpenGraphics(virDomainPtr dom,
+                          unsigned int idx,
+                          int fd,
+                          unsigned int flags);
+
 int virDomainInjectNMI(virDomainPtr domain, unsigned int flags);
 
 
diff --git a/src/driver.h b/src/driver.h
index b899d0e..4c14aaa 100644
--- a/src/driver.h
+++ b/src/driver.h
@@ -632,6 +632,11 @@ typedef int
                                const char *dev_name,
                                virStreamPtr st,
                                unsigned int flags);
+typedef int
+    (*virDrvDomainOpenGraphics)(virDomainPtr dom,
+                                unsigned int idx,
+                                int fd,
+                                unsigned int flags);
 
 typedef int
     (*virDrvDomainInjectNMI)(virDomainPtr dom, unsigned int flags);
@@ -881,6 +886,7 @@ struct _virDriver {
     virDrvDomainQemuMonitorCommand qemuDomainMonitorCommand;
     virDrvDomainQemuAttach qemuDomainAttach;
     virDrvDomainOpenConsole domainOpenConsole;
+    virDrvDomainOpenGraphics domainOpenGraphics;
     virDrvDomainInjectNMI domainInjectNMI;
     virDrvDomainMigrateBegin3	domainMigrateBegin3;
     virDrvDomainMigratePrepare3	domainMigratePrepare3;
diff --git a/src/libvirt.c b/src/libvirt.c
index 0b975da..5d7f1ce 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -16975,3 +16975,69 @@ error:
     virDispatchError(dom->conn);
     return -1;
 }
+
+
+/**
+ * virDomainOpenGraphics:
+ * @dom: pointer to domain object
+ * @fd: file descriptor to attach graphics to
+ * @idx: index of graphics config to open
+ * @flags: flags to control open operation
+ *
+ * This will attempt to connect the file descriptor @fd, to
+ * the graphics backend of @dom. If @dom has multiple graphics
+ * backends configured, then @idx will determine which one is
+ * opened, starting from @idx 0.
+ *
+ * To disable any authentication, pass the VIR_DOMAIN_OPEN_GRAPHICS_SKIPAUTH
+ * constant for @flags.
+ *
+ * The caller should use an anonymous socketpair to open
+ * @fd before invocation.
+ *
+ * This method can only be used when connected to a local
+ * libvirt hypervisor, over a UNIX domain socket. Attempts
+ * to use this method over a TCP connection will always fail
+ *
+ * Returns 0 on success, -1 on failure
+ */
+int virDomainOpenGraphics(virDomainPtr dom,
+                          unsigned int idx,
+                          int fd,
+                          unsigned int flags)
+{
+    VIR_DOMAIN_DEBUG(dom, "idx=%u, fd=%d, flags=%x",
+                     idx, fd, flags);
+
+    virResetLastError();
+
+    if (!VIR_IS_DOMAIN(dom)) {
+        virLibDomainError(VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
+        virDispatchError(NULL);
+        return -1;
+    }
+
+    if (fd < 0) {
+        virLibDomainError(VIR_ERR_INVALID_ARG, __FUNCTION__);
+        goto error;
+    }
+
+    if (dom->conn->flags & VIR_CONNECT_RO) {
+        virLibDomainError(VIR_ERR_OPERATION_DENIED, __FUNCTION__);
+        goto error;
+    }
+
+    if (dom->conn->driver->domainOpenGraphics) {
+        int ret;
+        ret = dom->conn->driver->domainOpenGraphics(dom, idx, fd, flags);
+        if (ret < 0)
+            goto error;
+        return ret;
+    }
+
+    virLibConnError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+
+error:
+    virDispatchError(dom->conn);
+    return -1;
+}
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index 9762fc4..caa21a2 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -495,6 +495,7 @@ LIBVIRT_0.9.7 {
         virDomainSnapshotGetParent;
         virDomainSnapshotListChildrenNames;
         virDomainSnapshotNumChildren;
+        virDomainOpenGraphics;
 } LIBVIRT_0.9.5;
 
 # .... define new API here using predicted next version number ....
-- 
1.7.6.4


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