Added untested DNS client code

include/libzt.h

@@ -413,6 +413,15 @@ int zts_gethostname(char *name, size_t len);
  */
 int zts_sethostname(const char *name, size_t len);
 
+/**
+ * @brief Return a pointer to an object with the following structure describing an internet host referenced by name
+ *
+ * @usage Call this after zts_start() has succeeded
+ * @param name
+ * @return Returns pointer to hostent structure otherwise NULL if failure
+ */
+struct hostent *zts_gethostbyname(const char *name);
+
 /**
  * @brief Close a socket
  *

include/lwIP.hpp

@@ -46,6 +46,22 @@
  */
 void lwip_driver_init();
 
+/**
+ * @brief Initialize and start the DNS client
+ *
+ * @usage Called after lwip_driver_init()
+ * @return
+ */
+void lwip_dns_init();
+
+/**
+ * @brief Starts DHCP timers
+ *
+ * @usage lwip_driver_init()
+ * @return
+ */
+void lwip_start_dhcp(struct netif *interface);
+
 void general_lwip_init_interface(void *tapref, struct netif *interface, const char *name, const ZeroTier::MAC &mac,
 	const ZeroTier::InetAddress &addr, const ZeroTier::InetAddress &nm, const ZeroTier::InetAddress &gw);
 

include/lwipopts.h

@@ -167,6 +167,7 @@
 #undef TCP_MSS
 #define TCP_MSS 1460
 
+#define LWIP_NETIF_API 1
 /*
 The TCP window size can be adjusted by changing the define TCP_WND. However,
 do keep in mind that this should be at least twice the size of TCP_MSS (thus
@@ -356,26 +357,26 @@ happening sooner than they should.
  * MEMP_NUM_NETCONN: the number of struct netconns.
  * (only needed if you use the sequential API, like api_lib.c)
  */
-#define MEMP_NUM_NETCONN                4
+#define MEMP_NUM_NETCONN                32
 
 /**
  * MEMP_NUM_TCPIP_MSG_API: the number of struct tcpip_msg, which are used
  * for callback/timeout API communication.
  * (only needed if you use tcpip.c)
  */
-#define MEMP_NUM_TCPIP_MSG_API          8
+#define MEMP_NUM_TCPIP_MSG_API          64
 
 /**
  * MEMP_NUM_TCPIP_MSG_INPKT: the number of struct tcpip_msg, which are used
  * for incoming packets.
  * (only needed if you use tcpip.c)
  */
-#define MEMP_NUM_TCPIP_MSG_INPKT        8
+#define MEMP_NUM_TCPIP_MSG_INPKT        32
 
 /**
  * PBUF_POOL_SIZE: the number of buffers in the pbuf pool.
  */
-#define PBUF_POOL_SIZE                  8000 /* was 32 */
+#define PBUF_POOL_SIZE                  4092 /* was 32 */
 
 
 /*------------------------------------------------------------------------------
@@ -433,7 +434,7 @@ happening sooner than they should.
  * PBUF_POOL_SIZE > IP_REASS_MAX_PBUFS so that the stack is still able to receive
  * packets even if the maximum amount of fragments is enqueued for reassembly!
  */
-#define IP_REASS_MAX_PBUFS              4
+#define IP_REASS_MAX_PBUFS              32
 
 /**
  * IP_FRAG_USES_STATIC_BUF==1: Use a static MTU-sized buffer for IP
@@ -476,7 +477,7 @@ happening sooner than they should.
 /**
  * LWIP_DHCP==1: Enable DHCP module.
  */
-#define LWIP_DHCP                       0
+#define LWIP_DHCP                       1
 
 
 /*------------------------------------------------------------------------------
@@ -518,7 +519,7 @@ happening sooner than they should.
  * LWIP_DNS==1: Turn on DNS module. UDP must be available for DNS
  * transport.
  */
-#define LWIP_DNS                        0
+#define LWIP_DNS                        1
 
 
 /*------------------------------------------------------------------------------