From: Martin Kletzander <mkletzan@redhat.com>

This function performs only parsing with the underlying
virDomainDefParseIDs() function to get needed metadata for any ACL
checks, but nothing else to avoid extraneous allocations and any
parser-induced DoS over ACL-forbidden connections.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
---
 src/conf/domain_conf.c   | 29 +++++++++++++++++++++++++++++
 src/conf/domain_conf.h   |  3 +++
 src/libvirt_private.syms |  1 +
 3 files changed, 33 insertions(+)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 396cd1c0dbc2..d2dea6952efc 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -20446,6 +20446,35 @@ virDomainDefParse(const char *xmlStr,
     return virDomainDefParseNode(ctxt, xmlopt, parseOpaque, flags);
 }
 
+virDomainDef *
+virDomainDefIDsParseString(const char *xmlStr,
+                           virDomainXMLOption *xmlopt,
+                           unsigned int flags)
+{
+    g_autoptr(virDomainDef) def = NULL;
+    g_autoptr(xmlDoc) xml = NULL;
+    g_autoptr(xmlXPathContext) ctxt = NULL;
+    bool uuid_generated = false;
+
+    xml = virXMLParseWithIndent(NULL, xmlStr, _("(domain_definition)"),
+                                "domain", &ctxt, "domain.rng", false);
+
+    if (!xml)
+        return NULL;
+
+    def = virDomainDefNew(xmlopt);
+    if (!def)
+        return NULL;
+
+    if (virDomainDefParseIDs(def, ctxt, flags, &uuid_generated) < 0)
+        return NULL;
+
+    if (uuid_generated)
+        memset(def->uuid, 0, VIR_UUID_BUFLEN);
+
+    return g_steal_pointer(&def);
+}
+
 virDomainDef *
 virDomainDefParseString(const char *xmlStr,
                         virDomainXMLOption *xmlopt,
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 81e735993d47..11eb46ae5385 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -3948,6 +3948,9 @@ virDomainDiskDef *virDomainDiskDefParse(const char *xmlStr,
 virStorageSource *virDomainDiskDefParseSource(const char *xmlStr,
                                               virDomainXMLOption *xmlopt,
                                               unsigned int flags);
+virDomainDef * virDomainDefIDsParseString(const char *xmlStr,
+                                          virDomainXMLOption *xmlopt,
+                                          unsigned int flags);
 virDomainDef *virDomainDefParseString(const char *xmlStr,
                                       virDomainXMLOption *xmlopt,
                                       void *parseOpaque,
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 7269dd37862d..fb482fff40a5 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -352,6 +352,7 @@ virDomainDefHasTimer;
 virDomainDefHasUSB;
 virDomainDefHasVcpusOffline;
 virDomainDefHasVDPANet;
+virDomainDefIDsParseString;
 virDomainDefLifecycleActionAllowed;
 virDomainDefMaybeAddController;
 virDomainDefMaybeAddInput;
-- 
2.51.2