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@2:e02950866c42, 2014-08-20 (annotated)
- Committer:
- Bongjun
- Date:
- Wed Aug 20 05:09:16 2014 +0000
- Revision:
- 2:e02950866c42
- Parent:
- 0:e11e8793c3ce
rollback code of wait_readable() in W5500.cpp
Who changed what in which revision?
User | Revision | Line number | New 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 | } |