Norimasa Okamoto
W5200(WIZ820io) network interface
MyNetDnsRequest.cpp@1:803123933c5a, 2012-04-17 (annotated)
- Committer:
- va009039
- Date:
- Tue Apr 17 12:13:15 2012 +0000
- Revision:
- 1:803123933c5a
- Parent:
- 0:61831b843b44
- Child:
- 2:a8df39b4f3aa
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| va009039 | 1:803123933c5a | 1 | // MyNetDnsRequest.cpp 2012/4/16 |
| 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 | 1:803123933c5a | 7 | #include "w5200NetIf.h" |
| va009039 | 0:61831b843b44 | 8 | |
| va009039 | 0:61831b843b44 | 9 | //#define DEBUG |
| va009039 | 0:61831b843b44 | 10 | |
| va009039 | 0:61831b843b44 | 11 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 12 | #include "Utils.h" |
| va009039 | 0:61831b843b44 | 13 | #define PRINT_FUNC() printf("%p %d:%s\n", this,__LINE__,__PRETTY_FUNCTION__) |
| va009039 | 0:61831b843b44 | 14 | #else //DEBUG |
| va009039 | 0:61831b843b44 | 15 | #define PRINT_FUNC() |
| va009039 | 0:61831b843b44 | 16 | #endif //DEBUG |
| va009039 | 0:61831b843b44 | 17 | |
| va009039 | 0:61831b843b44 | 18 | |
| va009039 | 0:61831b843b44 | 19 | MyNetDnsRequest::MyNetDnsRequest(const char* hostname) : NetDnsRequest(hostname), |
| va009039 | 0:61831b843b44 | 20 | m_state(MYNETDNS_START), m_cbFired(false), m_closing(false), m_udp(NULL) { |
| va009039 | 0:61831b843b44 | 21 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 22 | } |
| va009039 | 0:61831b843b44 | 23 | |
| va009039 | 0:61831b843b44 | 24 | MyNetDnsRequest::MyNetDnsRequest(Host* pHost) : NetDnsRequest(pHost), |
| va009039 | 0:61831b843b44 | 25 | m_state(MYNETDNS_START), m_cbFired(false), m_closing(false), m_udp(NULL) { |
| va009039 | 0:61831b843b44 | 26 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 27 | } |
| va009039 | 0:61831b843b44 | 28 | |
| va009039 | 0:61831b843b44 | 29 | MyNetDnsRequest::~MyNetDnsRequest() { |
| va009039 | 0:61831b843b44 | 30 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 31 | if (m_udp) { |
| va009039 | 0:61831b843b44 | 32 | delete m_udp; |
| va009039 | 0:61831b843b44 | 33 | } |
| va009039 | 0:61831b843b44 | 34 | } |
| va009039 | 0:61831b843b44 | 35 | |
| va009039 | 0:61831b843b44 | 36 | void MyNetDnsRequest::callback(UDPSocketEvent e) |
| va009039 | 0:61831b843b44 | 37 | { |
| va009039 | 0:61831b843b44 | 38 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 39 | uint8_t buf[512]; |
| va009039 | 0:61831b843b44 | 40 | Host host; |
| va009039 | 0:61831b843b44 | 41 | int len = m_udp->recvfrom((char*)buf, sizeof(buf), &host); |
| va009039 | 0:61831b843b44 | 42 | if (memcmp(buf, m_id, 2) != 0) { //verify |
| va009039 | 0:61831b843b44 | 43 | return; |
| va009039 | 0:61831b843b44 | 44 | } |
| va009039 | 0:61831b843b44 | 45 | int rcode = response(buf, len); |
| va009039 | 0:61831b843b44 | 46 | if (rcode == 0) { |
| va009039 | 0:61831b843b44 | 47 | m_state = MYNETDNS_OK; |
| va009039 | 0:61831b843b44 | 48 | } else { |
| va009039 | 0:61831b843b44 | 49 | m_state = MYNETDNS_NOTFOUND; |
| va009039 | 0:61831b843b44 | 50 | } |
| va009039 | 0:61831b843b44 | 51 | } |
| va009039 | 0:61831b843b44 | 52 | |
| va009039 | 0:61831b843b44 | 53 | int MyNetDnsRequest::response(uint8_t buf[], int size) { |
| va009039 | 0:61831b843b44 | 54 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 55 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 56 | printHex(buf, size); |
| va009039 | 0:61831b843b44 | 57 | #endif //DEBUG |
| va009039 | 0:61831b843b44 | 58 | int rcode = buf[3] & 0x0f; |
| va009039 | 0:61831b843b44 | 59 | if (rcode != 0) { |
| va009039 | 0:61831b843b44 | 60 | return rcode; |
| va009039 | 0:61831b843b44 | 61 | } |
| va009039 | 0:61831b843b44 | 62 | int qdcount = buf[4]<<8|buf[5]; |
| va009039 | 0:61831b843b44 | 63 | int ancount = buf[6]<<8|buf[7]; |
| va009039 | 0:61831b843b44 | 64 | int pos = 12; |
| va009039 | 0:61831b843b44 | 65 | while(qdcount-- > 0) { |
| va009039 | 0:61831b843b44 | 66 | dnsname qname(buf); |
| va009039 | 0:61831b843b44 | 67 | pos = qname.decode(pos); // qname |
| va009039 | 0:61831b843b44 | 68 | pos += 4; // qtype qclass |
| va009039 | 0:61831b843b44 | 69 | } |
| va009039 | 0:61831b843b44 | 70 | while(ancount-- > 0) { |
| va009039 | 0:61831b843b44 | 71 | dnsname name(buf); |
| va009039 | 0:61831b843b44 | 72 | pos = name.decode(pos); // name |
| va009039 | 0:61831b843b44 | 73 | int type = buf[pos]<<8|buf[pos+1]; |
| va009039 | 0:61831b843b44 | 74 | pos += 8; // type class TTL |
| va009039 | 0:61831b843b44 | 75 | int rdlength = buf[pos]<<8|buf[pos+1]; pos += 2; |
| va009039 | 0:61831b843b44 | 76 | int rdata_pos = pos; |
| va009039 | 0:61831b843b44 | 77 | pos += rdlength; |
| va009039 | 0:61831b843b44 | 78 | if (type == 1) { // A record |
| va009039 | 0:61831b843b44 | 79 | m_ip = IpAddr(buf[rdata_pos],buf[rdata_pos+1],buf[rdata_pos+2],buf[rdata_pos+3]); |
| va009039 | 0:61831b843b44 | 80 | } |
| va009039 | 0:61831b843b44 | 81 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 82 | printf("%s", name.str.c_str()); |
| va009039 | 0:61831b843b44 | 83 | if (type == 1) { |
| va009039 | 0:61831b843b44 | 84 | printf(" A %d.%d.%d.%d\n", |
| va009039 | 0:61831b843b44 | 85 | buf[rdata_pos],buf[rdata_pos+1],buf[rdata_pos+2],buf[rdata_pos+3]); |
| va009039 | 0:61831b843b44 | 86 | } else if (type == 5) { |
| va009039 | 0:61831b843b44 | 87 | dnsname rdname(buf); |
| va009039 | 0:61831b843b44 | 88 | rdname.decode(rdata_pos); |
| va009039 | 0:61831b843b44 | 89 | printf(" CNAME %s\n", rdname.str.c_str()); |
| va009039 | 0:61831b843b44 | 90 | } else { |
| va009039 | 0:61831b843b44 | 91 | printf(" TYPE:%d", type); |
| va009039 | 0:61831b843b44 | 92 | printfBytes(" RDATA:", &buf[rdata_pos], rdlength); |
| va009039 | 0:61831b843b44 | 93 | } |
| va009039 | 0:61831b843b44 | 94 | #endif //DEBUG |
| va009039 | 0:61831b843b44 | 95 | } |
| va009039 | 0:61831b843b44 | 96 | return rcode; |
| va009039 | 0:61831b843b44 | 97 | } |
| va009039 | 0:61831b843b44 | 98 | |
| va009039 | 0:61831b843b44 | 99 | int MyNetDnsRequest::query(uint8_t buf[], int size, const char* hostname) { |
| va009039 | 0:61831b843b44 | 100 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 101 | const uint8_t header[] = { |
| va009039 | 0:61831b843b44 | 102 | 0x00,0x00,0x01,0x00, // id=0x0000 QR=0 rd=1 opcode=0 rcode=0 |
| va009039 | 0:61831b843b44 | 103 | 0x00,0x01,0x00,0x00, // qdcount=1 ancount=0 |
| va009039 | 0:61831b843b44 | 104 | 0x00,0x00,0x00,0x00};// nscount=0 arcount=0 |
| va009039 | 0:61831b843b44 | 105 | const uint8_t tail[] = {0x00,0x01,0x00,0x01}; // qtype=A qclass=IN |
| va009039 | 0:61831b843b44 | 106 | memcpy(buf, header, sizeof(header)); |
| va009039 | 0:61831b843b44 | 107 | int t = clock(); |
| va009039 | 0:61831b843b44 | 108 | m_id[0] = t>>8; |
| va009039 | 0:61831b843b44 | 109 | m_id[1] = t; |
| va009039 | 0:61831b843b44 | 110 | memcpy(buf, m_id, 2); |
| va009039 | 0:61831b843b44 | 111 | dnsname qname(buf); |
| va009039 | 0:61831b843b44 | 112 | int pos = qname.encode(sizeof(header), (char*)hostname); |
| va009039 | 0:61831b843b44 | 113 | memcpy(buf+pos, tail, sizeof(tail)); |
| va009039 | 0:61831b843b44 | 114 | pos += sizeof(tail); |
| va009039 | 0:61831b843b44 | 115 | return pos; |
| va009039 | 0:61831b843b44 | 116 | } |
| va009039 | 0:61831b843b44 | 117 | |
| va009039 | 0:61831b843b44 | 118 | void MyNetDnsRequest::resolve(const char* hostname) { |
| va009039 | 0:61831b843b44 | 119 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 120 | if (m_udp == NULL) { |
| va009039 | 0:61831b843b44 | 121 | m_udp = new UDPSocket; |
| va009039 | 0:61831b843b44 | 122 | } |
| va009039 | 0:61831b843b44 | 123 | m_udp->setOnEvent(this, &MyNetDnsRequest::callback); |
| va009039 | 1:803123933c5a | 124 | Host local(IpAddr(0,0,0,0), 1024 + rand()&0x7fff); |
| va009039 | 1:803123933c5a | 125 | IpAddr dns(8,8,8,8); |
| va009039 | 1:803123933c5a | 126 | NetIf* pIf = Net::getDefaultIf(); |
| va009039 | 1:803123933c5a | 127 | if (pIf) { |
| va009039 | 1:803123933c5a | 128 | dns = ((w5200NetIf*)pIf)->m_dns; |
| va009039 | 1:803123933c5a | 129 | } |
| va009039 | 1:803123933c5a | 130 | Host server(dns, 53); // DNS |
| va009039 | 0:61831b843b44 | 131 | m_udp->bind(local); |
| va009039 | 0:61831b843b44 | 132 | uint8_t buf[256]; |
| va009039 | 0:61831b843b44 | 133 | int size = query(buf, sizeof(buf), hostname); |
| va009039 | 0:61831b843b44 | 134 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 135 | printf("hostname:[%s]\n", hostname); |
| va009039 | 0:61831b843b44 | 136 | printHex(buf, size); |
| va009039 | 0:61831b843b44 | 137 | #endif |
| va009039 | 0:61831b843b44 | 138 | m_udp->sendto((char*)buf, size, &server); |
| va009039 | 0:61831b843b44 | 139 | m_timer.reset(); |
| va009039 | 0:61831b843b44 | 140 | m_timer.start(); |
| va009039 | 0:61831b843b44 | 141 | } |
| va009039 | 0:61831b843b44 | 142 | |
| va009039 | 0:61831b843b44 | 143 | void MyNetDnsRequest::poll() { |
| va009039 | 0:61831b843b44 | 144 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 145 | #ifdef DEBUG |
| va009039 | 0:61831b843b44 | 146 | printf("%p m_state: %d, m_udp: %p\n", this, m_state, m_udp); |
| va009039 | 0:61831b843b44 | 147 | wait_ms(400); |
| va009039 | 0:61831b843b44 | 148 | #endif //DEBUG |
| va009039 | 0:61831b843b44 | 149 | switch(m_state) { |
| va009039 | 0:61831b843b44 | 150 | case MYNETDNS_START: |
| va009039 | 0:61831b843b44 | 151 | resolve(m_hostname); |
| va009039 | 0:61831b843b44 | 152 | m_state = MYNETDNS_PROCESSING; |
| va009039 | 0:61831b843b44 | 153 | break; |
| va009039 | 0:61831b843b44 | 154 | case MYNETDNS_PROCESSING: |
| va009039 | 0:61831b843b44 | 155 | break; |
| va009039 | 0:61831b843b44 | 156 | case MYNETDNS_NOTFOUND: |
| va009039 | 0:61831b843b44 | 157 | onReply(NETDNS_FOUND); |
| va009039 | 0:61831b843b44 | 158 | break; |
| va009039 | 0:61831b843b44 | 159 | case MYNETDNS_ERROR: |
| va009039 | 0:61831b843b44 | 160 | onReply(NETDNS_ERROR); |
| va009039 | 0:61831b843b44 | 161 | break; |
| va009039 | 0:61831b843b44 | 162 | case MYNETDNS_OK: |
| va009039 | 0:61831b843b44 | 163 | onReply(NETDNS_FOUND); |
| va009039 | 0:61831b843b44 | 164 | break; |
| va009039 | 0:61831b843b44 | 165 | } |
| va009039 | 0:61831b843b44 | 166 | if (m_timer.read_ms() > 3000) { |
| va009039 | 0:61831b843b44 | 167 | m_timer.stop(); |
| va009039 | 0:61831b843b44 | 168 | m_state = MYNETDNS_ERROR; |
| va009039 | 0:61831b843b44 | 169 | } |
| va009039 | 0:61831b843b44 | 170 | if(m_closing && (m_state!=MYNETDNS_PROCESSING)) { |
| va009039 | 0:61831b843b44 | 171 | NetDnsRequest::close(); |
| va009039 | 0:61831b843b44 | 172 | } |
| va009039 | 0:61831b843b44 | 173 | } |
| va009039 | 0:61831b843b44 | 174 | |
| va009039 | 0:61831b843b44 | 175 | void MyNetDnsRequest::close() { |
| va009039 | 0:61831b843b44 | 176 | PRINT_FUNC(); |
| va009039 | 0:61831b843b44 | 177 | if(m_state != MYNETDNS_PROCESSING) { |
| va009039 | 0:61831b843b44 | 178 | NetDnsRequest::close(); |
| va009039 | 0:61831b843b44 | 179 | } else { |
| va009039 | 0:61831b843b44 | 180 | m_closing = true; |
| va009039 | 0:61831b843b44 | 181 | } |
| va009039 | 0:61831b843b44 | 182 | } |