Norimasa Okamoto
W5200(WIZ820io) network interface
MyNetDnsRequest.cpp@0:61831b843b44, 2012-04-14 (annotated)
- Committer:
- va009039
- Date:
- Sat Apr 14 17:21:11 2012 +0000
- Revision:
- 0:61831b843b44
- Child:
- 1:803123933c5a
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| va009039 | 0:61831b843b44 | 1 | // MyNetDnsRequest.cpp 2012/4/13 |
| va009039 | 0:61831b843b44 | 2 | #include "mbed.h" |
| va009039 | 0:61831b843b44 | 3 | #include "MyNetDnsRequest.h" |
| va009039 | 0:61831b843b44 | 4 | #include "UDPSocket.h" |
| va009039 | 0:61831b843b44 | 5 | #include <string> |
| va009039 | 0:61831b843b44 | 6 | #include "dnsname.h" |
| va009039 | 0:61831b843b44 | 7 | |
| va009039 | 0:61831b843b44 | 8 | //#define DEBUG |
| va009039 | 0:61831b843b44 | 9 | |
| va009039 | 0:61831b843b44 | 10 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 11 | #include "Utils.h" |
| va009039 | 0:61831b843b44 | 12 | #define PRINT_FUNC() printf("%p %d:%s\n", this,__LINE__,__PRETTY_FUNCTION__) |
| va009039 | 0:61831b843b44 | 13 | #else //DEBUG |
| va009039 | 0:61831b843b44 | 14 | #define PRINT_FUNC() |
| va009039 | 0:61831b843b44 | 15 | #endif //DEBUG |
| va009039 | 0:61831b843b44 | 16 | |
| va009039 | 0:61831b843b44 | 17 | |
| va009039 | 0:61831b843b44 | 18 | MyNetDnsRequest::MyNetDnsRequest(const char* hostname) : NetDnsRequest(hostname), |
| va009039 | 0:61831b843b44 | 19 | m_state(MYNETDNS_START), m_cbFired(false), m_closing(false), m_udp(NULL) { |
| va009039 | 0:61831b843b44 | 20 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 21 | } |
| va009039 | 0:61831b843b44 | 22 | |
| va009039 | 0:61831b843b44 | 23 | MyNetDnsRequest::MyNetDnsRequest(Host* pHost) : NetDnsRequest(pHost), |
| va009039 | 0:61831b843b44 | 24 | m_state(MYNETDNS_START), m_cbFired(false), m_closing(false), m_udp(NULL) { |
| va009039 | 0:61831b843b44 | 25 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 26 | } |
| va009039 | 0:61831b843b44 | 27 | |
| va009039 | 0:61831b843b44 | 28 | MyNetDnsRequest::~MyNetDnsRequest() { |
| va009039 | 0:61831b843b44 | 29 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 30 | if (m_udp) { |
| va009039 | 0:61831b843b44 | 31 | delete m_udp; |
| va009039 | 0:61831b843b44 | 32 | } |
| va009039 | 0:61831b843b44 | 33 | } |
| va009039 | 0:61831b843b44 | 34 | |
| va009039 | 0:61831b843b44 | 35 | void MyNetDnsRequest::callback(UDPSocketEvent e) |
| va009039 | 0:61831b843b44 | 36 | { |
| va009039 | 0:61831b843b44 | 37 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 38 | uint8_t buf[512]; |
| va009039 | 0:61831b843b44 | 39 | Host host; |
| va009039 | 0:61831b843b44 | 40 | int len = m_udp->recvfrom((char*)buf, sizeof(buf), &host); |
| va009039 | 0:61831b843b44 | 41 | if (memcmp(buf, m_id, 2) != 0) { //verify |
| va009039 | 0:61831b843b44 | 42 | return; |
| va009039 | 0:61831b843b44 | 43 | } |
| va009039 | 0:61831b843b44 | 44 | int rcode = response(buf, len); |
| va009039 | 0:61831b843b44 | 45 | if (rcode == 0) { |
| va009039 | 0:61831b843b44 | 46 | m_state = MYNETDNS_OK; |
| va009039 | 0:61831b843b44 | 47 | } else { |
| va009039 | 0:61831b843b44 | 48 | m_state = MYNETDNS_NOTFOUND; |
| va009039 | 0:61831b843b44 | 49 | } |
| va009039 | 0:61831b843b44 | 50 | } |
| va009039 | 0:61831b843b44 | 51 | |
| va009039 | 0:61831b843b44 | 52 | int MyNetDnsRequest::response(uint8_t buf[], int size) { |
| va009039 | 0:61831b843b44 | 53 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 54 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 55 | printHex(buf, size); |
| va009039 | 0:61831b843b44 | 56 | #endif //DEBUG |
| va009039 | 0:61831b843b44 | 57 | int rcode = buf[3] & 0x0f; |
| va009039 | 0:61831b843b44 | 58 | if (rcode != 0) { |
| va009039 | 0:61831b843b44 | 59 | return rcode; |
| va009039 | 0:61831b843b44 | 60 | } |
| va009039 | 0:61831b843b44 | 61 | int qdcount = buf[4]<<8|buf[5]; |
| va009039 | 0:61831b843b44 | 62 | int ancount = buf[6]<<8|buf[7]; |
| va009039 | 0:61831b843b44 | 63 | int pos = 12; |
| va009039 | 0:61831b843b44 | 64 | while(qdcount-- > 0) { |
| va009039 | 0:61831b843b44 | 65 | dnsname qname(buf); |
| va009039 | 0:61831b843b44 | 66 | pos = qname.decode(pos); // qname |
| va009039 | 0:61831b843b44 | 67 | pos += 4; // qtype qclass |
| va009039 | 0:61831b843b44 | 68 | } |
| va009039 | 0:61831b843b44 | 69 | while(ancount-- > 0) { |
| va009039 | 0:61831b843b44 | 70 | dnsname name(buf); |
| va009039 | 0:61831b843b44 | 71 | pos = name.decode(pos); // name |
| va009039 | 0:61831b843b44 | 72 | int type = buf[pos]<<8|buf[pos+1]; |
| va009039 | 0:61831b843b44 | 73 | pos += 8; // type class TTL |
| va009039 | 0:61831b843b44 | 74 | int rdlength = buf[pos]<<8|buf[pos+1]; pos += 2; |
| va009039 | 0:61831b843b44 | 75 | int rdata_pos = pos; |
| va009039 | 0:61831b843b44 | 76 | pos += rdlength; |
| va009039 | 0:61831b843b44 | 77 | if (type == 1) { // A record |
| va009039 | 0:61831b843b44 | 78 | m_ip = IpAddr(buf[rdata_pos],buf[rdata_pos+1],buf[rdata_pos+2],buf[rdata_pos+3]); |
| va009039 | 0:61831b843b44 | 79 | } |
| va009039 | 0:61831b843b44 | 80 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 81 | printf("%s", name.str.c_str()); |
| va009039 | 0:61831b843b44 | 82 | if (type == 1) { |
| va009039 | 0:61831b843b44 | 83 | printf(" A %d.%d.%d.%d\n", |
| va009039 | 0:61831b843b44 | 84 | buf[rdata_pos],buf[rdata_pos+1],buf[rdata_pos+2],buf[rdata_pos+3]); |
| va009039 | 0:61831b843b44 | 85 | } else if (type == 5) { |
| va009039 | 0:61831b843b44 | 86 | dnsname rdname(buf); |
| va009039 | 0:61831b843b44 | 87 | rdname.decode(rdata_pos); |
| va009039 | 0:61831b843b44 | 88 | printf(" CNAME %s\n", rdname.str.c_str()); |
| va009039 | 0:61831b843b44 | 89 | } else { |
| va009039 | 0:61831b843b44 | 90 | printf(" TYPE:%d", type); |
| va009039 | 0:61831b843b44 | 91 | printfBytes(" RDATA:", &buf[rdata_pos], rdlength); |
| va009039 | 0:61831b843b44 | 92 | } |
| va009039 | 0:61831b843b44 | 93 | #endif //DEBUG |
| va009039 | 0:61831b843b44 | 94 | } |
| va009039 | 0:61831b843b44 | 95 | return rcode; |
| va009039 | 0:61831b843b44 | 96 | } |
| va009039 | 0:61831b843b44 | 97 | |
| va009039 | 0:61831b843b44 | 98 | int MyNetDnsRequest::query(uint8_t buf[], int size, const char* hostname) { |
| va009039 | 0:61831b843b44 | 99 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 100 | const uint8_t header[] = { |
| va009039 | 0:61831b843b44 | 101 | 0x00,0x00,0x01,0x00, // id=0x0000 QR=0 rd=1 opcode=0 rcode=0 |
| va009039 | 0:61831b843b44 | 102 | 0x00,0x01,0x00,0x00, // qdcount=1 ancount=0 |
| va009039 | 0:61831b843b44 | 103 | 0x00,0x00,0x00,0x00};// nscount=0 arcount=0 |
| va009039 | 0:61831b843b44 | 104 | const uint8_t tail[] = {0x00,0x01,0x00,0x01}; // qtype=A qclass=IN |
| va009039 | 0:61831b843b44 | 105 | memcpy(buf, header, sizeof(header)); |
| va009039 | 0:61831b843b44 | 106 | int t = clock(); |
| va009039 | 0:61831b843b44 | 107 | m_id[0] = t>>8; |
| va009039 | 0:61831b843b44 | 108 | m_id[1] = t; |
| va009039 | 0:61831b843b44 | 109 | memcpy(buf, m_id, 2); |
| va009039 | 0:61831b843b44 | 110 | dnsname qname(buf); |
| va009039 | 0:61831b843b44 | 111 | int pos = qname.encode(sizeof(header), (char*)hostname); |
| va009039 | 0:61831b843b44 | 112 | memcpy(buf+pos, tail, sizeof(tail)); |
| va009039 | 0:61831b843b44 | 113 | pos += sizeof(tail); |
| va009039 | 0:61831b843b44 | 114 | return pos; |
| va009039 | 0:61831b843b44 | 115 | } |
| va009039 | 0:61831b843b44 | 116 | |
| va009039 | 0:61831b843b44 | 117 | void MyNetDnsRequest::resolve(const char* hostname) { |
| va009039 | 0:61831b843b44 | 118 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 119 | if (m_udp == NULL) { |
| va009039 | 0:61831b843b44 | 120 | m_udp = new UDPSocket; |
| va009039 | 0:61831b843b44 | 121 | } |
| va009039 | 0:61831b843b44 | 122 | m_udp->setOnEvent(this, &MyNetDnsRequest::callback); |
| va009039 | 0:61831b843b44 | 123 | Host local(IpAddr(0,0,0,0), 1243); |
| va009039 | 0:61831b843b44 | 124 | Host server(IpAddr(8,8,8,8), 53); // DNS |
| va009039 | 0:61831b843b44 | 125 | m_udp->bind(local); |
| va009039 | 0:61831b843b44 | 126 | uint8_t buf[256]; |
| va009039 | 0:61831b843b44 | 127 | int size = query(buf, sizeof(buf), hostname); |
| va009039 | 0:61831b843b44 | 128 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 129 | printf("hostname:[%s]\n", hostname); |
| va009039 | 0:61831b843b44 | 130 | printHex(buf, size); |
| va009039 | 0:61831b843b44 | 131 | #endif |
| va009039 | 0:61831b843b44 | 132 | m_udp->sendto((char*)buf, size, &server); |
| va009039 | 0:61831b843b44 | 133 | m_timer.reset(); |
| va009039 | 0:61831b843b44 | 134 | m_timer.start(); |
| va009039 | 0:61831b843b44 | 135 | } |
| va009039 | 0:61831b843b44 | 136 | |
| va009039 | 0:61831b843b44 | 137 | void MyNetDnsRequest::poll() { |
| va009039 | 0:61831b843b44 | 138 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 139 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 140 | printf("%p m_state: %d, m_udp: %p\n", this, m_state, m_udp); |
| va009039 | 0:61831b843b44 | 141 | wait_ms(400); |
| va009039 | 0:61831b843b44 | 142 | #endif //DEBUG |
| va009039 | 0:61831b843b44 | 143 | switch(m_state) { |
| va009039 | 0:61831b843b44 | 144 | case MYNETDNS_START: |
| va009039 | 0:61831b843b44 | 145 | resolve(m_hostname); |
| va009039 | 0:61831b843b44 | 146 | m_state = MYNETDNS_PROCESSING; |
| va009039 | 0:61831b843b44 | 147 | break; |
| va009039 | 0:61831b843b44 | 148 | case MYNETDNS_PROCESSING: |
| va009039 | 0:61831b843b44 | 149 | break; |
| va009039 | 0:61831b843b44 | 150 | case MYNETDNS_NOTFOUND: |
| va009039 | 0:61831b843b44 | 151 | onReply(NETDNS_FOUND); |
| va009039 | 0:61831b843b44 | 152 | break; |
| va009039 | 0:61831b843b44 | 153 | case MYNETDNS_ERROR: |
| va009039 | 0:61831b843b44 | 154 | onReply(NETDNS_ERROR); |
| va009039 | 0:61831b843b44 | 155 | break; |
| va009039 | 0:61831b843b44 | 156 | case MYNETDNS_OK: |
| va009039 | 0:61831b843b44 | 157 | onReply(NETDNS_FOUND); |
| va009039 | 0:61831b843b44 | 158 | break; |
| va009039 | 0:61831b843b44 | 159 | } |
| va009039 | 0:61831b843b44 | 160 | if (m_timer.read_ms() > 3000) { |
| va009039 | 0:61831b843b44 | 161 | m_timer.stop(); |
| va009039 | 0:61831b843b44 | 162 | m_state = MYNETDNS_ERROR; |
| va009039 | 0:61831b843b44 | 163 | } |
| va009039 | 0:61831b843b44 | 164 | if(m_closing && (m_state!=MYNETDNS_PROCESSING)) { |
| va009039 | 0:61831b843b44 | 165 | NetDnsRequest::close(); |
| va009039 | 0:61831b843b44 | 166 | } |
| va009039 | 0:61831b843b44 | 167 | } |
| va009039 | 0:61831b843b44 | 168 | |
| va009039 | 0:61831b843b44 | 169 | void MyNetDnsRequest::close() { |
| va009039 | 0:61831b843b44 | 170 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 171 | if(m_state != MYNETDNS_PROCESSING) { |
| va009039 | 0:61831b843b44 | 172 | NetDnsRequest::close(); |
| va009039 | 0:61831b843b44 | 173 | } else { |
| va009039 | 0:61831b843b44 | 174 | m_closing = true; |
| va009039 | 0:61831b843b44 | 175 | } |
| va009039 | 0:61831b843b44 | 176 | } |