Initial tests DNS

user/cli.c

@@ -176,6 +176,10 @@ void ICACHE_FLASH_ATTR console_handle_command(struct espconn *pespconn) {
 	os_sprintf_flash(response, "time\r\nset [ntp_server|ntp_interval|ntp_timezone|ntp_time|ntp_weekday] <val>\r\n");
 	to_console(response);
 #endif
+#ifdef DNS_RESP
+	os_sprintf_flash(response, "set dns_name <name>\r\n");
+	to_console(response);
+#endif
 #ifdef MQTT_CLIENT
 	os_sprintf_flash(response, "set [mqtt_host|mqtt_port|mqtt_ssl|mqtt_user|mqtt_password|mqtt_id] <val>\r\n");
 	to_console(response);
@@ -213,6 +217,12 @@ void ICACHE_FLASH_ATTR console_handle_command(struct espconn *pespconn) {
 	    // if static DNS, add it
 	    os_sprintf(response, config.dns_addr.addr ? "DNS: %d.%d.%d.%d\r\n" : "", IP2STR(&config.dns_addr));
 	    to_console(response);
+#ifdef DNS_RESP
+            if (strcmp(config.broker_dns_name, "none")!=0 && config.ap_on) {
+		os_sprintf(response, "DNS name: %s\r\n", config.broker_dns_name);
+		to_console(response);
+	    }
+#endif
 #ifdef MDNS
 	    if (config.mdns_mode) {
 		os_sprintf(response, "mDNS: %s interface\r\n", config.mdns_mode==1 ? "STA": "SoftAP");
@@ -1026,6 +1036,14 @@ void ICACHE_FLASH_ATTR console_handle_command(struct espconn *pespconn) {
 		goto command_handled;
 	    }
 #endif
+#ifdef DNS_RESP
+	    if (strcmp(tokens[1], "dns_name") == 0) {
+		os_strncpy(config.broker_dns_name, tokens[2], 32);
+		config.mqtt_host[31] = 0;
+		os_sprintf_flash(response, "DNS name set\r\n");
+		goto command_handled;
+	    }
+#endif
 #ifdef MQTT_CLIENT
 	    if (strcmp(tokens[1], "mqtt_host") == 0) {
 		os_strncpy(config.mqtt_host, tokens[2], 32);

user/config_flash.c

@@ -63,6 +63,9 @@ void ICACHE_FLASH_ATTR config_load_default(sysconfig_p config) {
     config->ntp_interval = 300000000;
     config->ntp_timezone = 0;
 #endif
+#ifdef DNS_RESP
+    os_sprintf(config->broker_dns_name, "%s", "none");
+#endif
 #ifdef GPIO
 #ifdef GPIO_PWM
     config->pwm_period = 5000;

user/config_flash.h

@@ -81,6 +81,9 @@ typedef struct
     uint32_t	ntp_interval;	// Sync interval in usec
     int16_t	ntp_timezone;	// Timezone (hour offset to GMT)
 #endif
+#ifdef DNS_RESP
+    uint8_t	broker_dns_name[32];	// DNS name of the MQTT broker in the SoftAP network, "none" if empty
+#endif
 #ifdef GPIO
 #ifdef GPIO_PWM
     uint32_t	pwm_period;	// PWM period

user/user_config.h

@@ -88,6 +88,12 @@
 //
 #define MDNS	  1
 
+//
+// Define this if you want to have access the DNS responder.
+// Experimental feature - not yet tested
+//
+//#define DNS_RESP  1
+
 //
 // Define this to support the "scan" command for AP search
 //

user/user_main.c

@@ -26,6 +26,10 @@ uint64_t t_ntp_resync = 0;
 static struct mdns_info mdnsinfo;
 #endif
 
+#ifdef DNS_RESP
+#include "dns_responder.h"
+#endif
+
 #ifdef SCRIPTED
 #include "lang.h"
 #include "pub_list.h"
@@ -752,6 +756,24 @@ void ICACHE_FLASH_ATTR mqtt_got_retained(retained_entry *topic) {
 }
 
 
+#ifdef DNS_RESP
+int ICACHE_FLASH_ATTR get_A_Record(uint8_t addr[4], const char domain_name[])
+{
+  if (strcmp(config.broker_dns_name, domain_name) == 0) {
+    *(uint32_t*)addr = config.network_addr.addr;
+    return 0;
+  } else {
+    return -1;
+  }
+}
+
+int ICACHE_FLASH_ATTR get_AAAA_Record(uint8_t addr[16], const char domain_name[])
+{
+    return -1;
+}
+#endif
+
+
 void  user_init() {
     struct ip_info info;
 
@@ -843,6 +865,11 @@ void  user_init() {
 	wifi_set_opmode(STATIONAP_MODE);
 	user_set_softap_wifi_config();
 	do_ip_config = true;
+#ifdef DNS_RESP
+        if (strcmp(config.broker_dns_name, "none")!=0) {
+	    dns_resp_init(DNS_MODE_AP);
+	}
+#endif
     } else {
 	wifi_set_opmode(STATION_MODE);
     }