Bongjun Hur / WIZ550ioInterface

no upgrade or change at this. move to new Library for WIZ550io, W5500 -> http://mbed.org/teams/EthernetInterfaceW5500-makers/code/W5500Interface/

Dependents:   LPC11U68_NTPClient_HelloWorld_WIZ550io

Fork of WIZ550ioInterface by ban4jp -

please get the new Library for WIZ550io, W5500 (WIZnet) http://mbed.org/teams/EthernetInterfaceW5500-makers/code/W5500Interface/

Import libraryW5500Interface

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.

Last commit 28 Apr 2015 by W5500-Ethernet-Interface Makers

DNSClient/DNSClient.cpp@11:5a5a3f373a6b, 2014-07-08 (annotated)

Committer:
Bongjun
Date:
Tue Jul 08 03:49:33 2014 +0000
Revision:
11:5a5a3f373a6b
Parent:
5:fb15c35d1e28 
update some code after comparing WIZnet Library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
va009039 5:fb15c35d1e28 1 // DNSClient.cpp 2013/8/27
va009039 5:fb15c35d1e28 2 #include "mbed.h"
va009039 5:fb15c35d1e28 3 #include "mbed_debug.h"
va009039 5:fb15c35d1e28 4 #include "DNSClient.h"
va009039 5:fb15c35d1e28 5 #include "UDPSocket.h"
va009039 5:fb15c35d1e28 6 #include "dnsname.h"
va009039 5:fb15c35d1e28 7 #include "WIZ820io.h"
va009039 5:fb15c35d1e28 8
va009039 5:fb15c35d1e28 9 #define DBG_DNS 0
va009039 5:fb15c35d1e28 10
va009039 5:fb15c35d1e28 11 #if DBG_DNS
va009039 5:fb15c35d1e28 12 #define DBG2(...) do{debug("[DNS]%p %d %s ", this,__LINE__,__PRETTY_FUNCTION__); debug(__VA_ARGS__); } while(0);
va009039 5:fb15c35d1e28 13 #else
va009039 5:fb15c35d1e28 14 #define DBG2(...) while(0);
va009039 5:fb15c35d1e28 15 #endif
va009039 5:fb15c35d1e28 16
va009039 5:fb15c35d1e28 17 DNSClient::DNSClient(const char* hostname) : m_state(MYNETDNS_START), m_udp(NULL) {
va009039 5:fb15c35d1e28 18 m_hostname = hostname;
va009039 5:fb15c35d1e28 19 }
va009039 5:fb15c35d1e28 20
va009039 5:fb15c35d1e28 21 DNSClient::DNSClient(Endpoint* pHost) : m_state(MYNETDNS_START), m_udp(NULL) {
va009039 5:fb15c35d1e28 22 }
va009039 5:fb15c35d1e28 23
va009039 5:fb15c35d1e28 24 DNSClient::~DNSClient() {
va009039 5:fb15c35d1e28 25 if (m_udp) {
va009039 5:fb15c35d1e28 26 delete m_udp;
va009039 5:fb15c35d1e28 27 }
va009039 5:fb15c35d1e28 28 }
va009039 5:fb15c35d1e28 29
va009039 5:fb15c35d1e28 30 void DNSClient::callback()
va009039 5:fb15c35d1e28 31 {
va009039 5:fb15c35d1e28 32 uint8_t buf[512];
va009039 5:fb15c35d1e28 33 Endpoint host;
va009039 5:fb15c35d1e28 34 int len = m_udp->receiveFrom(host, (char*)buf, sizeof(buf));
va009039 5:fb15c35d1e28 35 if (len < 0) {
va009039 5:fb15c35d1e28 36 return;
va009039 5:fb15c35d1e28 37 }
va009039 5:fb15c35d1e28 38 if (memcmp(buf+0, m_id, 2) != 0) { //verify
va009039 5:fb15c35d1e28 39 return;
va009039 5:fb15c35d1e28 40 }
va009039 5:fb15c35d1e28 41 int rcode = response(buf, len);
va009039 5:fb15c35d1e28 42 if (rcode == 0) {
va009039 5:fb15c35d1e28 43 m_state = MYNETDNS_OK;
va009039 5:fb15c35d1e28 44 } else {
va009039 5:fb15c35d1e28 45 m_state = MYNETDNS_NOTFOUND;
va009039 5:fb15c35d1e28 46 }
va009039 5:fb15c35d1e28 47 }
va009039 5:fb15c35d1e28 48
va009039 5:fb15c35d1e28 49 int DNSClient::response(uint8_t buf[], int size) {
va009039 5:fb15c35d1e28 50 int rcode = buf[3] & 0x0f;
va009039 5:fb15c35d1e28 51 if (rcode != 0) {
va009039 5:fb15c35d1e28 52 return rcode;
va009039 5:fb15c35d1e28 53 }
va009039 5:fb15c35d1e28 54 int qdcount = buf[4]<<8|buf[5];
va009039 5:fb15c35d1e28 55 int ancount = buf[6]<<8|buf[7];
va009039 5:fb15c35d1e28 56 int pos = 12;
va009039 5:fb15c35d1e28 57 while(qdcount-- > 0) {
va009039 5:fb15c35d1e28 58 dnsname qname(buf);
va009039 5:fb15c35d1e28 59 pos = qname.decode(pos); // qname
va009039 5:fb15c35d1e28 60 pos += 4; // qtype qclass
va009039 5:fb15c35d1e28 61 }
va009039 5:fb15c35d1e28 62 while(ancount-- > 0) {
va009039 5:fb15c35d1e28 63 dnsname name(buf);
va009039 5:fb15c35d1e28 64 pos = name.decode(pos); // name
va009039 5:fb15c35d1e28 65 int type = buf[pos]<<8|buf[pos+1];
va009039 5:fb15c35d1e28 66 pos += 8; // type class TTL
va009039 5:fb15c35d1e28 67 int rdlength = buf[pos]<<8|buf[pos+1]; pos += 2;
va009039 5:fb15c35d1e28 68 int rdata_pos = pos;
va009039 5:fb15c35d1e28 69 pos += rdlength;
va009039 5:fb15c35d1e28 70 if (type == 1) { // A record
va009039 5:fb15c35d1e28 71 ip = (buf[rdata_pos]<<24) | (buf[rdata_pos+1]<<16) | (buf[rdata_pos+2]<<8) | buf[rdata_pos+3];
va009039 5:fb15c35d1e28 72 }
va009039 5:fb15c35d1e28 73 #if DBG_DNS
va009039 5:fb15c35d1e28 74 printf("%s", name.str.c_str());
va009039 5:fb15c35d1e28 75 if (type == 1) {
va009039 5:fb15c35d1e28 76 printf(" A %d.%d.%d.%d\n",
va009039 5:fb15c35d1e28 77 buf[rdata_pos],buf[rdata_pos+1],buf[rdata_pos+2],buf[rdata_pos+3]);
va009039 5:fb15c35d1e28 78 } else if (type == 5) {
va009039 5:fb15c35d1e28 79 dnsname rdname(buf);
va009039 5:fb15c35d1e28 80 rdname.decode(rdata_pos);
va009039 5:fb15c35d1e28 81 printf(" CNAME %s\n", rdname.str.c_str());
va009039 5:fb15c35d1e28 82 } else {
va009039 5:fb15c35d1e28 83 printf(" TYPE:%d", type);
va009039 5:fb15c35d1e28 84 printfBytes(" RDATA:", &buf[rdata_pos], rdlength);
va009039 5:fb15c35d1e28 85 }
va009039 5:fb15c35d1e28 86 #endif
va009039 5:fb15c35d1e28 87 }
va009039 5:fb15c35d1e28 88 return rcode;
va009039 5:fb15c35d1e28 89 }
va009039 5:fb15c35d1e28 90
va009039 5:fb15c35d1e28 91 int DNSClient::query(uint8_t buf[], int size, const char* hostname) {
va009039 5:fb15c35d1e28 92 const uint8_t header[] = {
va009039 5:fb15c35d1e28 93 0x00,0x00,0x01,0x00, // id=0x0000 QR=0 rd=1 opcode=0 rcode=0
va009039 5:fb15c35d1e28 94 0x00,0x01,0x00,0x00, // qdcount=1 ancount=0
va009039 5:fb15c35d1e28 95 0x00,0x00,0x00,0x00};// nscount=0 arcount=0
va009039 5:fb15c35d1e28 96 const uint8_t tail[] = {0x00,0x01,0x00,0x01}; // qtype=A qclass=IN
va009039 5:fb15c35d1e28 97 memcpy(buf, header, sizeof(header));
va009039 5:fb15c35d1e28 98 int t = rand();
va009039 5:fb15c35d1e28 99 m_id[0] = t>>8;
va009039 5:fb15c35d1e28 100 m_id[1] = t;
va009039 5:fb15c35d1e28 101 memcpy(buf, m_id, 2);
va009039 5:fb15c35d1e28 102 dnsname qname(buf);
va009039 5:fb15c35d1e28 103 int pos = qname.encode(sizeof(header), (char*)hostname);
va009039 5:fb15c35d1e28 104 memcpy(buf+pos, tail, sizeof(tail));
va009039 5:fb15c35d1e28 105 pos += sizeof(tail);
va009039 5:fb15c35d1e28 106 return pos;
va009039 5:fb15c35d1e28 107 }
va009039 5:fb15c35d1e28 108
va009039 5:fb15c35d1e28 109 void DNSClient::resolve(const char* hostname) {
va009039 5:fb15c35d1e28 110 if (m_udp == NULL) {
va009039 5:fb15c35d1e28 111 m_udp = new UDPSocket;
va009039 5:fb15c35d1e28 112 }
va009039 5:fb15c35d1e28 113 m_udp->init();
va009039 5:fb15c35d1e28 114 m_udp->set_blocking(false);
va009039 5:fb15c35d1e28 115 Endpoint server;
va009039 5:fb15c35d1e28 116 server.set_address("8.8.8.8", 53); // DNS
va009039 5:fb15c35d1e28 117 m_udp->bind(rand()&0x7fff);
va009039 5:fb15c35d1e28 118 uint8_t buf[256];
va009039 5:fb15c35d1e28 119 int size = query(buf, sizeof(buf), hostname);
va009039 5:fb15c35d1e28 120 #if DBG_DNS
va009039 5:fb15c35d1e28 121 printf("hostname:[%s]\n", hostname);
va009039 5:fb15c35d1e28 122 printHex(buf, size);
va009039 5:fb15c35d1e28 123 #endif
va009039 5:fb15c35d1e28 124 m_udp->sendTo(server, (char*)buf, size);
va009039 5:fb15c35d1e28 125 m_interval.reset();
va009039 5:fb15c35d1e28 126 m_interval.start();
va009039 5:fb15c35d1e28 127 }
va009039 5:fb15c35d1e28 128
va009039 5:fb15c35d1e28 129 void DNSClient::poll() {
va009039 5:fb15c35d1e28 130 #if DBG_DNS
va009039 5:fb15c35d1e28 131 printf("%p m_state: %d, m_udp: %p\n", this, m_state, m_udp);
va009039 5:fb15c35d1e28 132 wait_ms(400);
va009039 5:fb15c35d1e28 133 #endif
va009039 5:fb15c35d1e28 134 switch(m_state) {
va009039 5:fb15c35d1e28 135 case MYNETDNS_START:
va009039 5:fb15c35d1e28 136 m_retry = 0;
va009039 5:fb15c35d1e28 137 resolve(m_hostname);
va009039 5:fb15c35d1e28 138 m_state = MYNETDNS_PROCESSING;
va009039 5:fb15c35d1e28 139 break;
va009039 5:fb15c35d1e28 140 case MYNETDNS_PROCESSING:
va009039 5:fb15c35d1e28 141 break;
va009039 5:fb15c35d1e28 142 case MYNETDNS_NOTFOUND:
va009039 5:fb15c35d1e28 143 break;
va009039 5:fb15c35d1e28 144 case MYNETDNS_ERROR:
va009039 5:fb15c35d1e28 145 break;
va009039 5:fb15c35d1e28 146 case MYNETDNS_OK:
va009039 5:fb15c35d1e28 147 DBG2("m_retry=%d, m_interval=%d\n", m_retry, m_interval.read_ms());
va009039 5:fb15c35d1e28 148 break;
va009039 5:fb15c35d1e28 149 }
va009039 5:fb15c35d1e28 150 if (m_interval.read_ms() > 1000) {
va009039 5:fb15c35d1e28 151 m_interval.stop();
va009039 5:fb15c35d1e28 152 DBG2("timeout m_retry=%d\n", m_retry);
va009039 5:fb15c35d1e28 153 if (++m_retry >= 2) {
va009039 5:fb15c35d1e28 154 m_state = MYNETDNS_ERROR;
va009039 5:fb15c35d1e28 155 } else {
va009039 5:fb15c35d1e28 156 resolve(m_hostname);
va009039 5:fb15c35d1e28 157 m_state = MYNETDNS_PROCESSING;
va009039 5:fb15c35d1e28 158 }
va009039 5:fb15c35d1e28 159 }
va009039 5:fb15c35d1e28 160 }
va009039 5:fb15c35d1e28 161
va009039 5:fb15c35d1e28 162 bool DNSClient::lookup(const char* hostname) {
va009039 5:fb15c35d1e28 163 m_hostname = hostname;
va009039 5:fb15c35d1e28 164 m_state = MYNETDNS_START;
va009039 5:fb15c35d1e28 165 while(1) {
va009039 5:fb15c35d1e28 166 poll();
va009039 5:fb15c35d1e28 167 callback();
va009039 5:fb15c35d1e28 168 if (m_state != MYNETDNS_PROCESSING) {
va009039 5:fb15c35d1e28 169 break;
va009039 5:fb15c35d1e28 170 }
va009039 5:fb15c35d1e28 171 }
va009039 5:fb15c35d1e28 172 return m_state == MYNETDNS_OK;
va009039 5:fb15c35d1e28 173 }