ospfd: fix GR state location

This belongs in `/var/lib`, not `/var/run`.

Use library facility to load/save, support previous path as fallback,
and do proper fsync().

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

2 files changed, 38 insertions, 36 deletions

diff --git a/ospfd/ospf_gr.c b/ospfd/ospf_gr.c
index c23c42052f..0a4d579fc9 100644
--- a/ospfd/ospf_gr.c
+++ b/ospfd/ospf_gr.c
@@ -555,21 +555,6 @@ static void ospf_gr_grace_period_expired(struct event *thread)
 	ospf_gr_restart_exit(ospf, "grace period has expired");
 }
 
-/*
- * Returns the path of the file (non-volatile memory) that contains GR status
- * information.
- */
-static char *ospf_gr_nvm_filepath(struct ospf *ospf)
-{
-	static char filepath[MAXPATHLEN];
-	char instance[16] = "";
-
-	if (ospf->instance)
-		snprintf(instance, sizeof(instance), "-%d", ospf->instance);
-	snprintf(filepath, sizeof(filepath), OSPFD_GR_STATE, instance);
-	return filepath;
-}
-
 /* Send extra Grace-LSA out the interface (unplanned outages only). */
 void ospf_gr_iface_send_grace_lsa(struct event *thread)
 {
@@ -591,18 +576,14 @@ void ospf_gr_iface_send_grace_lsa(struct event *thread)
  */
 static void ospf_gr_nvm_update(struct ospf *ospf, bool prepare)
 {
-	char *filepath;
 	const char *inst_name;
 	json_object *json;
 	json_object *json_instances;
 	json_object *json_instance;
 
-	filepath = ospf_gr_nvm_filepath(ospf);
 	inst_name = ospf_get_name(ospf);
 
-	json = json_object_from_file(filepath);
-	if (json == NULL)
-		json = json_object_new_object();
+	json = frr_daemon_state_load();
 
 	json_object_object_get_ex(json, "instances", &json_instances);
 	if (!json_instances) {
@@ -630,8 +611,7 @@ static void ospf_gr_nvm_update(struct ospf *ospf, bool prepare)
 		json_object_int_add(json_instance, "timestamp",
 				    time(NULL) + ospf->gr_info.grace_period);
 
-	json_object_to_file_ext(filepath, json, JSON_C_TO_STRING_PRETTY);
-	json_object_free(json);
+	frr_daemon_state_save(&json);
 }
 
 /*
@@ -640,17 +620,13 @@ static void ospf_gr_nvm_update(struct ospf *ospf, bool prepare)
  */
 void ospf_gr_nvm_delete(struct ospf *ospf)
 {
-	char *filepath;
 	const char *inst_name;
 	json_object *json;
 	json_object *json_instances;
 
-	filepath = ospf_gr_nvm_filepath(ospf);
 	inst_name = ospf_get_name(ospf);
 
-	json = json_object_from_file(filepath);
-	if (json == NULL)
-		json = json_object_new_object();
+	json = frr_daemon_state_load();
 
 	json_object_object_get_ex(json, "instances", &json_instances);
 	if (!json_instances) {
@@ -660,8 +636,7 @@ void ospf_gr_nvm_delete(struct ospf *ospf)
 
 	json_object_object_del(json_instances, inst_name);
 
-	json_object_to_file_ext(filepath, json, JSON_C_TO_STRING_PRETTY);
-	json_object_free(json);
+	frr_daemon_state_save(&json);
 }
 
 /*
@@ -670,7 +645,6 @@ void ospf_gr_nvm_delete(struct ospf *ospf)
  */
 void ospf_gr_nvm_read(struct ospf *ospf)
 {
-	char *filepath;
 	const char *inst_name;
 	json_object *json;
 	json_object *json_instances;
@@ -679,12 +653,9 @@ void ospf_gr_nvm_read(struct ospf *ospf)
 	json_object *json_grace_period;
 	time_t timestamp = 0;
 
-	filepath = ospf_gr_nvm_filepath(ospf);
 	inst_name = ospf_get_name(ospf);
 
-	json = json_object_from_file(filepath);
-	if (json == NULL)
-		json = json_object_new_object();
+	json = frr_daemon_state_load();
 
 	json_object_object_get_ex(json, "instances", &json_instances);
 	if (!json_instances) {
@@ -730,8 +701,7 @@ void ospf_gr_nvm_read(struct ospf *ospf)
 
 	json_object_object_del(json_instances, inst_name);
 
-	json_object_to_file_ext(filepath, json, JSON_C_TO_STRING_PRETTY);
-	json_object_free(json);
+	frr_daemon_state_save(&json);
 }
 
 void ospf_gr_unplanned_start_interface(struct ospf_interface *oi)
diff --git a/ospfd/ospf_main.c b/ospfd/ospf_main.c
index 168cdbe482..6a4a9a1481 100644
--- a/ospfd/ospf_main.c
+++ b/ospfd/ospf_main.c
@@ -45,6 +45,16 @@
 #include "ospfd/ospf_ldp_sync.h"
 #include "ospfd/ospf_routemap_nb.h"
 
+#define OSPFD_STATE_NAME	 "%s/ospfd.json", frr_libstatedir
+#define OSPFD_INST_STATE_NAME(i) "%s/ospfd-%d.json", frr_runstatedir, i
+
+/* this one includes the path... because the instance number was in the path
+ * before :( ... which totally didn't have a mkdir anywhere.
+ */
+#define OSPFD_COMPAT_STATE_NAME "%s/ospfd-gr.json", frr_libstatedir
+#define OSPFD_COMPAT_INST_STATE_NAME(i)                                        \
+	"%s-%d/ospfd-gr.json", frr_runstatedir, i
+
 /* ospfd privileges */
 zebra_capabilities_t _caps_p[] = {ZCAP_NET_RAW, ZCAP_BIND, ZCAP_NET_ADMIN,
 				  ZCAP_SYS_ADMIN};
@@ -126,6 +136,15 @@ static const struct frr_yang_module_info *const ospfd_yang_modules[] = {
 	&frr_ospf_route_map_info,
 };
 
+/* actual paths filled in main() */
+static char state_path[512];
+static char state_compat_path[512];
+static char *state_paths[] = {
+	state_path,
+	state_compat_path,
+	NULL,
+};
+
 /* clang-format off */
 FRR_DAEMON_INFO(ospfd, OSPF,
 	.vty_port = OSPF_VTY_PORT,
@@ -138,6 +157,8 @@ FRR_DAEMON_INFO(ospfd, OSPF,
 
 	.yang_modules = ospfd_yang_modules,
 	.n_yang_modules = array_size(ospfd_yang_modules),
+
+	.state_paths = state_paths,
 );
 /* clang-format on */
 
@@ -213,6 +234,17 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
+	if (ospf_instance) {
+		snprintf(state_path, sizeof(state_path),
+			 OSPFD_INST_STATE_NAME(ospf_instance));
+		snprintf(state_compat_path, sizeof(state_compat_path),
+			 OSPFD_COMPAT_INST_STATE_NAME(ospf_instance));
+	} else {
+		snprintf(state_path, sizeof(state_path), OSPFD_STATE_NAME);
+		snprintf(state_compat_path, sizeof(state_compat_path),
+			 OSPFD_COMPAT_STATE_NAME);
+	}
+
 	/* OSPF master init. */
 	ospf_master_init(frr_init());