lldpad: remove device from config file when ports are removed

config.c

@@ -472,6 +472,32 @@ int get_config_setting(const char *ifname, int agenttype, char *path,
 	return (rval == CONFIG_FALSE) ? cmd_failed : cmd_success;
 }
 
+int remove_config_device(const char *ifname, int agenttype)
+{
+	const char *section = agent_type2section(agenttype);
+	config_setting_t *setting = NULL;
+	int rval = cmd_failed;
+
+	setting = config_lookup(&lldpad_cfg, section);
+
+	if (setting != NULL) {
+		rval = config_setting_remove(setting, ifname);
+		if (rval == CONFIG_TRUE) {
+			LLDPAD_DBG("In %s, remove %s from section %s\n", __func__, ifname, section);
+			if (config_write_file(&lldpad_cfg, cfg_file_name)) {
+				rval = cmd_success;
+			} else {
+				LLDPAD_DBG("In %s, update config failed\n", __func__);
+				rval = cmd_failed;
+			}
+		}
+	} else {
+		LLDPAD_DBG("In %s, can't find section %s\n", __func__, section);
+	}
+
+	return rval;
+}
+
 int remove_config_setting(const char *ifname, int agenttype, char *parent,
 			  char *name)
 {

include/config.h

@@ -79,6 +79,7 @@ int get_cfg(const char *ifname, int agenttype, char *path, union cfg_get value,
 int set_cfg(const char *ifname, int agenttype, char *path, union cfg_set value, int type);
 int get_config_setting(const char *ifname, int agenttype, char *path, union cfg_get value, int type);
 int set_config_setting(const char *ifname, int agenttype, char *path, union cfg_set value, int type);
+int remove_config_device(const char *ifname, int agenttype);
 int remove_config_setting(const char *ifname, int agenttype, char *parent, char *name);
 int get_config_tlvfield(const char *ifname, int agenttype, u32 tlvid, const char *field, union cfg_get value, int type);
 int get_config_tlvfield_int(const char *ifname, int agenttype, u32 tlvid, const char *field, int *value);

lldp/ports.c

@@ -355,6 +355,9 @@ int remove_port(const char *ifname)
 			free(agent->tx.frameout);
 
 		LIST_REMOVE(agent, entry);
+
+		remove_config_device(ifname, agent->type);
+
 		free(agent);
 	}