Support reporting live interface IP/netmask

This patch adds the flag VIR_INTERFACE_XML_INACTIVE to
virInterfaceGetXMLDesc's flags. When it is*not* set (the default), the
live interface info will be returned in the XML (in particular, the IP
address(es) and netmask(s) will be retrieved by querying the interface
directly, rather than  reporting what's in the config file). The
backend of this is in netcf's ncf_if_xml_state() function.

* configure.in libvirt.spec.in: requires netcf >= 0.1.3
* include/libvirt/libvirt.h.in: adds flag VIR_INTERFACE_XML_INACTIVE
* src/conf/interface_conf.c src/interface/netcf_driver.c src/libvirt.c:
  update the parsing and backend routines accordingly
* tools/virsh.c: change interface edit to inactive definition and
  adds the inactive flag for interface dump

configure.in

@@ -33,7 +33,7 @@ GNUTLS_REQUIRED="1.0.25"
 AVAHI_REQUIRED="0.6.0"
 POLKIT_REQUIRED="0.6"
 PARTED_REQUIRED="1.8.0"
-NETCF_REQUIRED="0.0.1"
+NETCF_REQUIRED="0.1.3"
 
 dnl Checks for C compiler.
 AC_PROG_CC

include/libvirt/libvirt.h.in

@@ -930,6 +930,10 @@ virInterfacePtr         virInterfaceLookupByMACString (virConnectPtr conn,
 const char*             virInterfaceGetName       (virInterfacePtr iface);
 const char*             virInterfaceGetMACString  (virInterfacePtr iface);
 
+typedef enum {
+    VIR_INTERFACE_XML_INACTIVE = 1 /* dump inactive interface information */
+} virInterfaceXMLFlags;
+
 char *                  virInterfaceGetXMLDesc    (virInterfacePtr iface,
                                                    unsigned int flags);
 virInterfacePtr         virInterfaceDefineXML     (virConnectPtr conn,

libvirt.spec.in

@@ -308,7 +308,7 @@ BuildRequires: libcap-ng-devel >= 0.5.0
 BuildRequires: libssh2-devel
 %endif
 %if %{with_netcf}
-BuildRequires: netcf-devel
+BuildRequires: netcf-devel >= 0.1.3
 %endif
 
 # Fedora build root suckage

src/conf/interface_conf.c

@@ -279,22 +279,19 @@ virInterfaceDefParseIp(virConnectPtr conn, virInterfaceDefPtr def,
 static int
 virInterfaceDefParseProtoIPv4(virConnectPtr conn, virInterfaceDefPtr def,
                               xmlXPathContextPtr ctxt) {
-    xmlNodePtr cur;
-    int ret;
+    xmlNodePtr dhcp, ip;
+    int ret = 0;
 
-    cur = virXPathNode(conn, "./dhcp", ctxt);
-    if (cur != NULL)
-        ret = virInterfaceDefParseDhcp(conn, def, cur, ctxt);
-    else {
-        cur = virXPathNode(conn, "./ip", ctxt);
-        if (cur != NULL)
-            ret = virInterfaceDefParseIp(conn, def, cur, ctxt);
-        else {
-            virInterfaceReportError(conn, VIR_ERR_XML_ERROR,
-                                "%s", _("interface miss dhcp or ip adressing"));
-            ret = -1;
-        }
-    }
+    dhcp = virXPathNode(conn, "./dhcp", ctxt);
+    if (dhcp != NULL)
+        ret = virInterfaceDefParseDhcp(conn, def, dhcp, ctxt);
+
+    if (ret != 0)
+        return(ret);
+
+    ip = virXPathNode(conn, "./ip", ctxt);
+    if (ip != NULL)
+        ret = virInterfaceDefParseIp(conn, def, ip, ctxt);
     return(ret);
 }
 
@@ -1012,20 +1009,18 @@ virInterfaceProtocolDefFormat(virConnectPtr conn ATTRIBUTE_UNUSED,
             virBufferAddLit(buf, "    <dhcp peerdns='yes'/>\n");
         else
             virBufferAddLit(buf, "    <dhcp/>\n");
-    } else {
-        /* theorically if we don't have dhcp we should have an address */
-        if (def->proto.address != NULL) {
-            if (def->proto.prefix != 0)
-                virBufferVSprintf(buf, "    <ip address='%s' prefix='%d'/>\n",
-                                  def->proto.address, def->proto.prefix);
-            else
-                virBufferVSprintf(buf, "    <ip address='%s'/>\n",
-                                  def->proto.address);
-        }
-        if (def->proto.gateway != NULL) {
-            virBufferVSprintf(buf, "    <route gateway='%s'/>\n",
-                              def->proto.gateway);
-        }
+    }
+    if (def->proto.address != NULL) {
+        if (def->proto.prefix != 0)
+            virBufferVSprintf(buf, "    <ip address='%s' prefix='%d'/>\n",
+                              def->proto.address, def->proto.prefix);
+        else
+            virBufferVSprintf(buf, "    <ip address='%s'/>\n",
+                              def->proto.address);
+    }
+    if (def->proto.gateway != NULL) {
+        virBufferVSprintf(buf, "    <route gateway='%s'/>\n",
+                          def->proto.gateway);
     }
     virBufferAddLit(buf, "  </protocol>\n");
     return(0);

src/interface/netcf_driver.c

@@ -326,7 +326,7 @@ cleanup:
 }
 
 static char *interfaceGetXMLDesc(virInterfacePtr ifinfo,
-                                 unsigned int flags ATTRIBUTE_UNUSED)
+                                 unsigned int flags)
 {
     struct interface_driver *driver = ifinfo->conn->interfacePrivateData;
     struct netcf_if *iface = NULL;
@@ -342,7 +342,11 @@ static char *interfaceGetXMLDesc(virInterfacePtr ifinfo,
         goto cleanup;
     }
 
-    xmlstr = ncf_if_xml_desc(iface);
+    if ((flags & VIR_INTERFACE_XML_INACTIVE)) {
+        xmlstr = ncf_if_xml_desc(iface);
+    } else {
+        xmlstr = ncf_if_xml_state(iface);
+    }
     if (!xmlstr) {
         const char *errmsg, *details;
         int errcode = ncf_error(driver->netcf, &errmsg, &details);

src/libvirt.c

@@ -6201,10 +6201,17 @@ virInterfaceGetMACString(virInterfacePtr iface)
 /**
  * virInterfaceGetXMLDesc:
  * @iface: an interface object
- * @flags: an OR'ed set of extraction flags, not used yet
+ * @flags: an OR'ed set of extraction flags. Current valid bits:
+ *
+ *      VIR_INTERFACE_XML_INACTIVE - return the static configuration,
+ *                                   suitable for use redefining the
+ *                                   interface via virInterfaceDefineXML()
  *
- * Provide an XML description of the interface. The description may be reused
- * later to redefine the interface with virInterfaceDefineXML().
+ * Provide an XML description of the interface. If
+ * VIR_INTERFACE_XML_INACTIVE is set, the description may be reused
+ * later to redefine the interface with virInterfaceDefineXML(). If it
+ * is not set, the ip address and netmask will be the current live
+ * setting of the interface, not the settings from the config files.
  *
  * Returns a 0 terminated UTF-8 encoded XML instance, or NULL in case of error.
  *         the caller must free() the returned value.
@@ -6221,7 +6228,7 @@ virInterfaceGetXMLDesc(virInterfacePtr iface, unsigned int flags)
         virLibInterfaceError(NULL, VIR_ERR_INVALID_INTERFACE, __FUNCTION__);
         return (NULL);
     }
-    if (flags != 0) {
+    if ((flags & ~VIR_INTERFACE_XML_INACTIVE) != 0) {
         virLibInterfaceError(iface, VIR_ERR_INVALID_ARG, __FUNCTION__);
         goto error;
     }

tools/virsh.c

@@ -2792,7 +2792,7 @@ cmdInterfaceEdit (vshControl *ctl, const vshCmd *cmd)
     char *doc = NULL;
     char *doc_edited = NULL;
     char *doc_reread = NULL;
-    int flags = 0;
+    int flags = VIR_INTERFACE_XML_INACTIVE;
 
     if (!vshConnectionUsability(ctl, ctl->conn, TRUE))
         goto cleanup;
@@ -3326,6 +3326,7 @@ static const vshCmdInfo info_interface_dumpxml[] = {
 
 static const vshCmdOptDef opts_interface_dumpxml[] = {
     {"interface", VSH_OT_DATA, VSH_OFLAG_REQ, gettext_noop("interface name or MAC address")},
+    {"inactive", VSH_OT_BOOL, 0, gettext_noop("show inactive defined XML")},
     {NULL, 0, 0, NULL}
 };
 
@@ -3335,6 +3336,11 @@ cmdInterfaceDumpXML(vshControl *ctl, const vshCmd *cmd)
     virInterfacePtr iface;
     int ret = TRUE;
     char *dump;
+    int flags = 0;
+    int inactive = vshCommandOptBool(cmd, "inactive");
+
+    if (inactive)
+        flags |= VIR_INTERFACE_XML_INACTIVE;
 
     if (!vshConnectionUsability(ctl, ctl->conn, TRUE))
         return FALSE;
@@ -3342,7 +3348,7 @@ cmdInterfaceDumpXML(vshControl *ctl, const vshCmd *cmd)
     if (!(iface = vshCommandOptInterface(ctl, cmd, NULL)))
         return FALSE;
 
-    dump = virInterfaceGetXMLDesc(iface, 0);
+    dump = virInterfaceGetXMLDesc(iface, flags);
     if (dump != NULL) {
         printf("%s", dump);
         free(dump);