dns: drop get_name() and is_caching() virtual functions for klass variables

The plugin name and whether a plugin is caching only depends on the type,
it does not require a virtual function where types would decided depending
on other reasons.

Convert the virtual functions into fields of the class.

src/dns/nm-dns-dnsmasq.c

@@ -425,20 +425,6 @@ child_quit (NMDnsPlugin *plugin, int status)
 
 /*****************************************************************************/
 
-static gboolean
-is_caching (NMDnsPlugin *plugin)
-{
-	return TRUE;
-}
-
-static const char *
-get_name (NMDnsPlugin *plugin)
-{
-	return "dnsmasq";
-}
-
-/*****************************************************************************/
-
 static void
 nm_dns_dnsmasq_init (NMDnsDnsmasq *self)
 {
@@ -473,8 +459,8 @@ nm_dns_dnsmasq_class_init (NMDnsDnsmasqClass *dns_class)
 
 	object_class->dispose = dispose;
 
-	plugin_class->child_quit = child_quit;
-	plugin_class->is_caching = is_caching;
-	plugin_class->update = update;
-	plugin_class->get_name = get_name;
+	plugin_class->plugin_name = "dnsmasq";
+	plugin_class->is_caching  = TRUE;
+	plugin_class->child_quit  = child_quit;
+	plugin_class->update      = update;
 }

src/dns/nm-dns-plugin.c

@@ -74,23 +74,22 @@ nm_dns_plugin_update (NMDnsPlugin *self,
 	                                               hostname);
 }
 
-static gboolean
-is_caching (NMDnsPlugin *self)
-{
-	return FALSE;
-}
-
 gboolean
 nm_dns_plugin_is_caching (NMDnsPlugin *self)
 {
-	return NM_DNS_PLUGIN_GET_CLASS (self)->is_caching (self);
+	return NM_DNS_PLUGIN_GET_CLASS (self)->is_caching;
 }
 
 const char *
 nm_dns_plugin_get_name (NMDnsPlugin *self)
 {
-	g_assert (NM_DNS_PLUGIN_GET_CLASS (self)->get_name);
-	return NM_DNS_PLUGIN_GET_CLASS (self)->get_name (self);
+	NMDnsPluginClass *klass;
+
+	g_return_val_if_fail (NM_IS_DNS_PLUGIN (self), NULL);
+
+	klass = NM_DNS_PLUGIN_GET_CLASS (self);
+	nm_assert (klass->plugin_name);
+	return klass->plugin_name;
 }
 
 /*****************************************************************************/
@@ -275,8 +274,6 @@ nm_dns_plugin_class_init (NMDnsPluginClass *plugin_class)
 
 	object_class->dispose = dispose;
 
-	plugin_class->is_caching = is_caching;
-
 	/* Emitted by the plugin and consumed by NMDnsManager when
 	 * some error happens with the nameserver subprocess.  Causes NM to fall
 	 * back to writing out a non-local-caching resolv.conf until the next

src/dns/nm-dns-plugin.h

@@ -2,8 +2,8 @@
 /* Copyright (C) 2010 Red Hat, Inc.
  */
 
-#ifndef __NETWORKMANAGER_DNS_PLUGIN_H__
-#define __NETWORKMANAGER_DNS_PLUGIN_H__
+#ifndef __NM_DNS_PLUGIN_H__
+#define __NM_DNS_PLUGIN_H__
 
 #include "nm-dns-manager.h"
 #include "nm-config-data.h"
@@ -28,8 +28,6 @@ typedef struct {
 typedef struct {
 	GObjectClass parent;
 
-	/* Methods */
-
 	/* Called when DNS information is changed.  'configs' is an array
 	 * of pointers to NMDnsIPConfigData sorted by priority.
 	 * 'global_config' is the optional global DNS
@@ -40,16 +38,7 @@ typedef struct {
 	                    const CList *ip_config_lst_head,
 	                    const char *hostname);
 
-	/* Subclasses should override and return TRUE if they start a local
-	 * caching nameserver that listens on localhost and would block any
-	 * other local caching nameserver from operating.
-	 */
-	gboolean (*is_caching) (NMDnsPlugin *self);
-
-	/* Subclasses should override this and return their plugin name */
-	const char *(*get_name) (NMDnsPlugin *self);
-
-	/* Signals */
+	const char *plugin_name;
 
 	/* Emitted by the plugin base class when the nameserver subprocess
 	 * quits.  This signal is consumed by the plugin subclasses and not
@@ -57,6 +46,13 @@ typedef struct {
 	 * by waitpid(2)) is fatal it should then emit the 'failed' signal.
 	 */
 	void (*child_quit) (NMDnsPlugin *self, int status);
+
+	/* Types should set to TRUE if they start a local caching nameserver
+	 * that listens on localhost and would block any other local caching
+	 * nameserver from operating.
+	 */
+	bool is_caching:1;
+
 } NMDnsPluginClass;
 
 GType nm_dns_plugin_get_type (void);
@@ -89,4 +85,4 @@ GPid nm_dns_plugin_child_pid (NMDnsPlugin *self);
 
 gboolean nm_dns_plugin_child_kill (NMDnsPlugin *self);
 
-#endif /* __NETWORKMANAGER_DNS_PLUGIN_H__ */
+#endif /* __NM_DNS_PLUGIN_H__ */

src/dns/nm-dns-systemd-resolved.c

@@ -388,20 +388,6 @@ update (NMDnsPlugin *plugin,
 
 /*****************************************************************************/
 
-static gboolean
-is_caching (NMDnsPlugin *plugin)
-{
-	return TRUE;
-}
-
-static const char *
-get_name (NMDnsPlugin *plugin)
-{
-	return "systemd-resolved";
-}
-
-/*****************************************************************************/
-
 static void
 name_owner_changed (NMDnsSystemdResolved *self,
                     const char *owner)
@@ -553,7 +539,7 @@ nm_dns_systemd_resolved_class_init (NMDnsSystemdResolvedClass *dns_class)
 
 	object_class->dispose = dispose;
 
-	plugin_class->is_caching = is_caching;
-	plugin_class->update = update;
-	plugin_class->get_name = get_name;
+	plugin_class->plugin_name = "systemd-resolved";
+	plugin_class->is_caching  = TRUE;
+	plugin_class->update      = update;
 }

src/dns/nm-dns-unbound.c

@@ -46,18 +46,6 @@ update (NMDnsPlugin *plugin,
 	return (status == 0);
 }
 
-static gboolean
-is_caching (NMDnsPlugin *plugin)
-{
-	return TRUE;
-}
-
-static const char *
-get_name (NMDnsPlugin *plugin)
-{
-	return "unbound";
-}
-
 /*****************************************************************************/
 
 static void
@@ -76,7 +64,7 @@ nm_dns_unbound_class_init (NMDnsUnboundClass *klass)
 {
 	NMDnsPluginClass *plugin_class = NM_DNS_PLUGIN_CLASS (klass);
 
-	plugin_class->update = update;
-	plugin_class->is_caching = is_caching;
-	plugin_class->get_name = get_name;
+	plugin_class->plugin_name = "unbound";
+	plugin_class->is_caching  = TRUE;
+	plugin_class->update      = update;
 }