Merge pull request #2265 from pi-hole/fix/v5_v6_hosts_cnameRecords

Prevent duplicated entries on successive v5 Teleporter importing

src/config/dnsmasq_config.c

@@ -841,6 +841,12 @@ bool read_legacy_dhcp_static_config(void)
 		return false;
 	}
 
+	// Clear out config.dhcp.hosts array if it exists
+	if(config.dhcp.hosts.v.json != NULL)
+		cJSON_Delete(config.dhcp.hosts.v.json);
+	config.dhcp.hosts.v.json = cJSON_CreateArray();
+
+	// Read file line by line
 	char *linebuffer = NULL;
 	size_t size = 0u;
 	errno = 0;
@@ -898,6 +904,12 @@ bool read_legacy_cnames_config(void)
 		return false;
 	}
 
+	// Clear out config.dns.cnameRecords array if it exists
+	if(config.dns.cnameRecords.v.json != NULL)
+		cJSON_Delete(config.dns.cnameRecords.v.json);
+	config.dns.cnameRecords.v.json = cJSON_CreateArray();
+
+	// Read file line by line
 	char *linebuffer = NULL;
 	size_t size = 0u;
 	errno = 0;
@@ -955,6 +967,12 @@ bool read_legacy_custom_hosts_config(void)
 		return false;
 	}
 
+	// Clear out config.dns.hosts array if it exists
+	if(config.dns.hosts.v.json != NULL)
+		cJSON_Delete(config.dns.hosts.v.json);
+	config.dns.hosts.v.json = cJSON_CreateArray();
+
+	// Read file line by line
 	char *linebuffer = NULL;
 	size_t size = 0u;
 	errno = 0;