DNS and SNTP via DHCP

src/net_builtin.h

@@ -14,6 +14,16 @@ struct mg_tcpip_driver {
   bool (*up)(struct mg_tcpip_if *);                           // Up/down status
 };
 
+typedef void (*mg_tcpip_event_handler_t)(struct mg_tcpip_if *ifp, int ev,
+                                         void *ev_data);
+
+enum {
+  MG_TCPIP_EV_ST_CHG,     // state change             uint8_t * (&ifp->state)
+  MG_TCPIP_EV_DHCP_DNS,   // DHCP DNS assignment      uint32_t *ipaddr
+  MG_TCPIP_EV_DHCP_SNTP,  // DHCP SNTP assignment     uint32_t *ipaddr
+  MG_TCPIP_EV_USER        // Starting ID for user events
+};
+
 // Network interface
 struct mg_tcpip_if {
   uint8_t mac[6];                  // MAC address. Must be set to a valid MAC
@@ -22,10 +32,13 @@ struct mg_tcpip_if {
   bool enable_dhcp_client;         // Enable DCHP client
   bool enable_dhcp_server;         // Enable DCHP server
   bool enable_get_gateway;         // DCHP server sets client as gateway
+  bool enable_req_dns;             // DCHP client requests DNS server
+  bool enable_req_sntp;            // DCHP client requests SNTP server
   bool enable_crc32_check;         // Do a CRC check on RX frames and strip it
   bool enable_mac_check;           // Do a MAC check on RX frames
   struct mg_tcpip_driver *driver;  // Low level driver
   void *driver_data;               // Driver-specific data
+  mg_tcpip_event_handler_t fn;     // User-specified event handler function
   struct mg_mgr *mgr;              // Mongoose event manager
   struct mg_queue recv_queue;      // Receive queue
   uint16_t mtu;                    // Interface MTU