W5500-Ethernet-Interface Makers / W5500Interface

This is the Interface library for WIZnet W5500 chip which forked of EthernetInterfaceW5500, WIZnetInterface and WIZ550ioInterface. This library has simple name as "W5500Interface". and can be used for Wiz550io users also.

Dependents:   EvrythngApi Websocket_Ethernet_HelloWorld_W5500 Websocket_Ethernet_W5500 CurrentWeatherData_W5500 ... more

Information

It has EthernetInterface class like official EthernetInterface , but uses Wiznet chip driver codes.

So this library can use only the WIZnet W5500 or WIZ550io users.

This library has referred to many project such as WIZ550ioInterface, WiflyInterface and WIZnet Library.

Thanks all.

DNSClient/DNSClient.cpp@11:5499fa2d8898, 2015-04-28 (annotated)

Committer:
embeddist
Date:
Tue Apr 28 13:52:23 2015 +0000
Revision:
11:5499fa2d8898
Parent:
0:e11e8793c3ce 
Remove the setting of tx/rx buffer in SWReset

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Bongjun 0:e11e8793c3ce 1 // DNSClient.cpp 2013/8/27
Bongjun 0:e11e8793c3ce 2 #include "mbed.h"
Bongjun 0:e11e8793c3ce 3 #include "mbed_debug.h"
Bongjun 0:e11e8793c3ce 4 #include "DNSClient.h"
Bongjun 0:e11e8793c3ce 5 #include "UDPSocket.h"
Bongjun 0:e11e8793c3ce 6 #include "dnsname.h"
Bongjun 0:e11e8793c3ce 7 #include "wiznet.h"
Bongjun 0:e11e8793c3ce 8
Bongjun 0:e11e8793c3ce 9 #define DBG_DNS 0
Bongjun 0:e11e8793c3ce 10
Bongjun 0:e11e8793c3ce 11 #if DBG_DNS
Bongjun 0:e11e8793c3ce 12 #define DBG2(...) do{debug("[DNS]%p %d %s ", this,__LINE__,__PRETTY_FUNCTION__); debug(__VA_ARGS__); } while(0);
Bongjun 0:e11e8793c3ce 13 #else
Bongjun 0:e11e8793c3ce 14 #define DBG2(...) while(0);
Bongjun 0:e11e8793c3ce 15 #endif
Bongjun 0:e11e8793c3ce 16
Bongjun 0:e11e8793c3ce 17 DNSClient::DNSClient(const char* hostname) : m_state(MYNETDNS_START), m_udp(NULL) {
Bongjun 0:e11e8793c3ce 18 m_hostname = hostname;
Bongjun 0:e11e8793c3ce 19 }
Bongjun 0:e11e8793c3ce 20
Bongjun 0:e11e8793c3ce 21 DNSClient::DNSClient(Endpoint* pHost) : m_state(MYNETDNS_START), m_udp(NULL) {
Bongjun 0:e11e8793c3ce 22 }
Bongjun 0:e11e8793c3ce 23
Bongjun 0:e11e8793c3ce 24 DNSClient::~DNSClient() {
Bongjun 0:e11e8793c3ce 25 if (m_udp) {
Bongjun 0:e11e8793c3ce 26 delete m_udp;
Bongjun 0:e11e8793c3ce 27 }
Bongjun 0:e11e8793c3ce 28 }
Bongjun 0:e11e8793c3ce 29
Bongjun 0:e11e8793c3ce 30 void DNSClient::callback()
Bongjun 0:e11e8793c3ce 31 {
Bongjun 0:e11e8793c3ce 32 uint8_t buf[512];
Bongjun 0:e11e8793c3ce 33 Endpoint host;
Bongjun 0:e11e8793c3ce 34 int len = m_udp->receiveFrom(host, (char*)buf, sizeof(buf));
Bongjun 0:e11e8793c3ce 35 if (len < 0) {
Bongjun 0:e11e8793c3ce 36 return;
Bongjun 0:e11e8793c3ce 37 }
Bongjun 0:e11e8793c3ce 38 if (memcmp(buf+0, m_id, 2) != 0) { //verify
Bongjun 0:e11e8793c3ce 39 return;
Bongjun 0:e11e8793c3ce 40 }
Bongjun 0:e11e8793c3ce 41 int rcode = response(buf, len);
Bongjun 0:e11e8793c3ce 42 if (rcode == 0) {
Bongjun 0:e11e8793c3ce 43 m_state = MYNETDNS_OK;
Bongjun 0:e11e8793c3ce 44 } else {
Bongjun 0:e11e8793c3ce 45 m_state = MYNETDNS_NOTFOUND;
Bongjun 0:e11e8793c3ce 46 }
Bongjun 0:e11e8793c3ce 47 }
Bongjun 0:e11e8793c3ce 48
Bongjun 0:e11e8793c3ce 49 int DNSClient::response(uint8_t buf[], int size) {
Bongjun 0:e11e8793c3ce 50 int rcode = buf[3] & 0x0f;
Bongjun 0:e11e8793c3ce 51 if (rcode != 0) {
Bongjun 0:e11e8793c3ce 52 return rcode;
Bongjun 0:e11e8793c3ce 53 }
Bongjun 0:e11e8793c3ce 54 int qdcount = buf[4]<<8|buf[5];
Bongjun 0:e11e8793c3ce 55 int ancount = buf[6]<<8|buf[7];
Bongjun 0:e11e8793c3ce 56 int pos = 12;
Bongjun 0:e11e8793c3ce 57 while(qdcount-- > 0) {
Bongjun 0:e11e8793c3ce 58 dnsname qname(buf);
Bongjun 0:e11e8793c3ce 59 pos = qname.decode(pos); // qname
Bongjun 0:e11e8793c3ce 60 pos += 4; // qtype qclass
Bongjun 0:e11e8793c3ce 61 }
Bongjun 0:e11e8793c3ce 62 while(ancount-- > 0) {
Bongjun 0:e11e8793c3ce 63 dnsname name(buf);
Bongjun 0:e11e8793c3ce 64 pos = name.decode(pos); // name
Bongjun 0:e11e8793c3ce 65 int type = buf[pos]<<8|buf[pos+1];
Bongjun 0:e11e8793c3ce 66 pos += 8; // type class TTL
Bongjun 0:e11e8793c3ce 67 int rdlength = buf[pos]<<8|buf[pos+1]; pos += 2;
Bongjun 0:e11e8793c3ce 68 int rdata_pos = pos;
Bongjun 0:e11e8793c3ce 69 pos += rdlength;
Bongjun 0:e11e8793c3ce 70 if (type == 1) { // A record
Bongjun 0:e11e8793c3ce 71 ip = (buf[rdata_pos]<<24) | (buf[rdata_pos+1]<<16) | (buf[rdata_pos+2]<<8) | buf[rdata_pos+3];
Bongjun 0:e11e8793c3ce 72 }
Bongjun 0:e11e8793c3ce 73 #if DBG_DNS
Bongjun 0:e11e8793c3ce 74 printf("%s", name.str.c_str());
Bongjun 0:e11e8793c3ce 75 if (type == 1) {
Bongjun 0:e11e8793c3ce 76 printf(" A %d.%d.%d.%d\n",
Bongjun 0:e11e8793c3ce 77 buf[rdata_pos],buf[rdata_pos+1],buf[rdata_pos+2],buf[rdata_pos+3]);
Bongjun 0:e11e8793c3ce 78 } else if (type == 5) {
Bongjun 0:e11e8793c3ce 79 dnsname rdname(buf);
Bongjun 0:e11e8793c3ce 80 rdname.decode(rdata_pos);
Bongjun 0:e11e8793c3ce 81 printf(" CNAME %s\n", rdname.str.c_str());
Bongjun 0:e11e8793c3ce 82 } else {
Bongjun 0:e11e8793c3ce 83 printf(" TYPE:%d", type);
Bongjun 0:e11e8793c3ce 84 printfBytes(" RDATA:", &buf[rdata_pos], rdlength);
Bongjun 0:e11e8793c3ce 85 }
Bongjun 0:e11e8793c3ce 86 #endif
Bongjun 0:e11e8793c3ce 87 }
Bongjun 0:e11e8793c3ce 88 return rcode;
Bongjun 0:e11e8793c3ce 89 }
Bongjun 0:e11e8793c3ce 90
Bongjun 0:e11e8793c3ce 91 int DNSClient::query(uint8_t buf[], int size, const char* hostname) {
Bongjun 0:e11e8793c3ce 92 const uint8_t header[] = {
Bongjun 0:e11e8793c3ce 93 0x00,0x00,0x01,0x00, // id=0x0000 QR=0 rd=1 opcode=0 rcode=0
Bongjun 0:e11e8793c3ce 94 0x00,0x01,0x00,0x00, // qdcount=1 ancount=0
Bongjun 0:e11e8793c3ce 95 0x00,0x00,0x00,0x00};// nscount=0 arcount=0
Bongjun 0:e11e8793c3ce 96 const uint8_t tail[] = {0x00,0x01,0x00,0x01}; // qtype=A qclass=IN
Bongjun 0:e11e8793c3ce 97 memcpy(buf, header, sizeof(header));
Bongjun 0:e11e8793c3ce 98 int t = rand();
Bongjun 0:e11e8793c3ce 99 m_id[0] = t>>8;
Bongjun 0:e11e8793c3ce 100 m_id[1] = t;
Bongjun 0:e11e8793c3ce 101 memcpy(buf, m_id, 2);
Bongjun 0:e11e8793c3ce 102 dnsname qname(buf);
Bongjun 0:e11e8793c3ce 103 int pos = qname.encode(sizeof(header), (char*)hostname);
Bongjun 0:e11e8793c3ce 104 memcpy(buf+pos, tail, sizeof(tail));
Bongjun 0:e11e8793c3ce 105 pos += sizeof(tail);
Bongjun 0:e11e8793c3ce 106 return pos;
Bongjun 0:e11e8793c3ce 107 }
Bongjun 0:e11e8793c3ce 108
Bongjun 0:e11e8793c3ce 109 void DNSClient::resolve(const char* hostname) {
Bongjun 0:e11e8793c3ce 110 if (m_udp == NULL) {
Bongjun 0:e11e8793c3ce 111 m_udp = new UDPSocket;
Bongjun 0:e11e8793c3ce 112 }
Bongjun 0:e11e8793c3ce 113 m_udp->init();
Bongjun 0:e11e8793c3ce 114 m_udp->set_blocking(false);
Bongjun 0:e11e8793c3ce 115 Endpoint server;
Bongjun 0:e11e8793c3ce 116 server.set_address("8.8.8.8", 53); // DNS
Bongjun 0:e11e8793c3ce 117 m_udp->bind(rand()&0x7fff);
Bongjun 0:e11e8793c3ce 118 uint8_t buf[256];
Bongjun 0:e11e8793c3ce 119 int size = query(buf, sizeof(buf), hostname);
Bongjun 0:e11e8793c3ce 120 #if DBG_DNS
Bongjun 0:e11e8793c3ce 121 printf("hostname:[%s]\n", hostname);
Bongjun 0:e11e8793c3ce 122 printHex(buf, size);
Bongjun 0:e11e8793c3ce 123 #endif
Bongjun 0:e11e8793c3ce 124 m_udp->sendTo(server, (char*)buf, size);
Bongjun 0:e11e8793c3ce 125 m_interval.reset();
Bongjun 0:e11e8793c3ce 126 m_interval.start();
Bongjun 0:e11e8793c3ce 127 }
Bongjun 0:e11e8793c3ce 128
Bongjun 0:e11e8793c3ce 129 void DNSClient::poll() {
Bongjun 0:e11e8793c3ce 130 #if DBG_DNS
Bongjun 0:e11e8793c3ce 131 printf("%p m_state: %d, m_udp: %p\n", this, m_state, m_udp);
Bongjun 0:e11e8793c3ce 132 wait_ms(400);
Bongjun 0:e11e8793c3ce 133 #endif
Bongjun 0:e11e8793c3ce 134 switch(m_state) {
Bongjun 0:e11e8793c3ce 135 case MYNETDNS_START:
Bongjun 0:e11e8793c3ce 136 m_retry = 0;
Bongjun 0:e11e8793c3ce 137 resolve(m_hostname);
Bongjun 0:e11e8793c3ce 138 m_state = MYNETDNS_PROCESSING;
Bongjun 0:e11e8793c3ce 139 break;
Bongjun 0:e11e8793c3ce 140 case MYNETDNS_PROCESSING:
Bongjun 0:e11e8793c3ce 141 break;
Bongjun 0:e11e8793c3ce 142 case MYNETDNS_NOTFOUND:
Bongjun 0:e11e8793c3ce 143 break;
Bongjun 0:e11e8793c3ce 144 case MYNETDNS_ERROR:
Bongjun 0:e11e8793c3ce 145 break;
Bongjun 0:e11e8793c3ce 146 case MYNETDNS_OK:
Bongjun 0:e11e8793c3ce 147 DBG2("m_retry=%d, m_interval=%d\n", m_retry, m_interval.read_ms());
Bongjun 0:e11e8793c3ce 148 break;
Bongjun 0:e11e8793c3ce 149 }
Bongjun 0:e11e8793c3ce 150 if (m_interval.read_ms() > 1000) {
Bongjun 0:e11e8793c3ce 151 m_interval.stop();
Bongjun 0:e11e8793c3ce 152 DBG2("timeout m_retry=%d\n", m_retry);
Bongjun 0:e11e8793c3ce 153 if (++m_retry >= 2) {
Bongjun 0:e11e8793c3ce 154 m_state = MYNETDNS_ERROR;
Bongjun 0:e11e8793c3ce 155 } else {
Bongjun 0:e11e8793c3ce 156 resolve(m_hostname);
Bongjun 0:e11e8793c3ce 157 m_state = MYNETDNS_PROCESSING;
Bongjun 0:e11e8793c3ce 158 }
Bongjun 0:e11e8793c3ce 159 }
Bongjun 0:e11e8793c3ce 160 }
Bongjun 0:e11e8793c3ce 161
Bongjun 0:e11e8793c3ce 162 bool DNSClient::lookup(const char* hostname) {
Bongjun 0:e11e8793c3ce 163 m_hostname = hostname;
Bongjun 0:e11e8793c3ce 164 m_state = MYNETDNS_START;
Bongjun 0:e11e8793c3ce 165 while(1) {
Bongjun 0:e11e8793c3ce 166 poll();
Bongjun 0:e11e8793c3ce 167 callback();
Bongjun 0:e11e8793c3ce 168 if (m_state != MYNETDNS_PROCESSING) {
Bongjun 0:e11e8793c3ce 169 break;
Bongjun 0:e11e8793c3ce 170 }
Bongjun 0:e11e8793c3ce 171 }
Bongjun 0:e11e8793c3ce 172 return m_state == MYNETDNS_OK;
Bongjun 0:e11e8793c3ce 173 }