[libvirt] [PATCH v1 07/14] conf: Parse user supplied aliases

[Michal Privoznik]

If driver that is calling the parse supports user supplied
aliases, they can be parsed even for inactive XMLs. However, to
avoid any clashes with aliases that libvirt generates, the user
ones have to have "ua-" prefix.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/conf/domain_conf.c | 13 +++++++++++--
 src/conf/domain_conf.h |  1 +
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index f4de4e288..f1386c116 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -6398,6 +6398,10 @@ virDomainDeviceAddressParseXML(xmlNodePtr address,
 }
 
 
+#define USER_ALIAS_PREFIX "ua-"
+#define USER_ALIAS_CHARS \
+    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-"
+
 /* Parse the XML definition for a device address
  * @param node XML nodeset to parse for device address definition
  */
@@ -6424,7 +6428,6 @@ virDomainDeviceInfoParseXML(virDomainXMLOptionPtr xmlopt ATTRIBUTE_UNUSED,
     while (cur != NULL) {
         if (cur->type == XML_ELEMENT_NODE) {
             if (alias == NULL &&
-                !(flags & VIR_DOMAIN_DEF_PARSE_INACTIVE) &&
                 virXMLNodeNameEqual(cur, "alias")) {
                 alias = cur;
             } else if (address == NULL &&
@@ -6446,8 +6449,14 @@ virDomainDeviceInfoParseXML(virDomainXMLOptionPtr xmlopt ATTRIBUTE_UNUSED,
         cur = cur->next;
     }
 
-    if (alias)
+    if (alias) {
         info->alias = virXMLPropString(alias, "name");
+        if (flags & VIR_DOMAIN_DEF_PARSE_INACTIVE &&
+            (!STRPREFIX(info->alias, USER_ALIAS_PREFIX) ||
+             !(xmlopt->config.features & VIR_DOMAIN_DEF_FEATURE_USER_ALIAS) ||
+             strspn(info->alias, USER_ALIAS_CHARS) < strlen(info->alias)))
+            VIR_FREE(info->alias);
+    }
 
     if (master) {
         info->mastertype = VIR_DOMAIN_CONTROLLER_MASTER_USB;
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 1e007346f..5ff85057f 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2508,6 +2508,7 @@ typedef enum {
     VIR_DOMAIN_DEF_FEATURE_OFFLINE_VCPUPIN = (1 << 2),
     VIR_DOMAIN_DEF_FEATURE_NAME_SLASH = (1 << 3),
     VIR_DOMAIN_DEF_FEATURE_INDIVIDUAL_VCPUS = (1 << 4),
+    VIR_DOMAIN_DEF_FEATURE_USER_ALIAS = (1 << 5),
 } virDomainDefFeatures;
 
 
-- 
2.13.6