/**
*@brief 读取数据
*@param RData：读取数据存放数组
*@return 无
*/
void RJ45_2_Read(u8 *RData)
{
u16 Start_Address;
u32 Address;
RJ45_2_Read_Buf(Sn_RX_RSR0(0),ReadTem,2);
RJ45_2_RLength =ReadTem[0]*256+ReadTem[1]; //获取接收到数据长度
RJ45_2_Read_Buf(Sn_RX_RD0(0),ReadTem,2);
Start_Address=ReadTem[0]*256+ReadTem[1]; //获取相对地址
WriteTem[0]=(Start_Address+RJ45_2_RLength)/256;
WriteTem[1]=(Start_Address+RJ45_2_RLength)%256;
Address=(u32)(Start_Address<<8)+(0<<5)+0x18; //得到绝对地址
RJ45_2_Read_Buf(Address,RData,RJ45_2_RLength); //读取数据
RJ45_2_Write_Buf(Sn_RX_RD0(0),WriteTem,2); //写入读取指针
RJ45_2_Write_Register(Sn_CR(0),Sn_CR_RECV);
while(RJ45_2_Read_Register(Sn_CR(0))); /*Wait to process the command*/
}
// return value:
// A DNSError_t (DNSSuccess on success, something else otherwise)
// in "int" mode: positive on success, negative on error
DNSError_t EthernetDNSClass::pollDNSReply(byte ipAddr[4])
{
DNSError_t statusCode = DNSSuccess;
#if defined(_USE_MALLOC_)
DNSHeader_t* dnsHeader = NULL;
#else
DNSHeader_t dnsHeaderBuf;
DNSHeader_t* dnsHeader = &dnsHeaderBuf;
#endif
uint8_t* buf;
uint32_t svr_addr;
uint16_t svr_port, udp_len, ptr, qCnt, aCnt;
if (DNSStateQuerySent != this->_state) {
statusCode = DNSNothingToDo;
goto errorReturn;
}
if (NULL == ipAddr) {
statusCode = DNSInvalidArgument;
goto errorReturn;
}
if (0 == (IINCHIP_READ(Sn_RX_RSR0(this->_socket))) &&
0 == (IINCHIP_READ(Sn_RX_RSR0(this->_socket) + 1))) {
statusCode = DNSTryLater;
goto errorReturn;
}
#if defined(_USE_MALLOC_)
dnsHeader = (DNSHeader_t*)malloc(sizeof(DNSHeader_t));
if (NULL == dnsHeader) {
statusCode = DNSOutOfMemory;
goto errorReturn;
}
#endif
ptr = IINCHIP_READ(Sn_RX_RD0(this->_socket));
ptr = ((ptr & 0x00ff) << 8) + IINCHIP_READ(Sn_RX_RD0(this->_socket) + 1);
// read UDP header
buf = (uint8_t*)dnsHeader;
read_data(this->_socket, (vuint8*)ptr, (vuint8*)buf, 8);
ptr += 8;
memcpy(&svr_addr, buf, sizeof(uint32_t));
*((uint16_t*)&svr_port) = dns_ntohs(*((uint32_t*)(buf+4)));
*((uint16_t*)&udp_len) = dns_ntohs(*((uint32_t*)(buf+6)));
read_data(this->_socket, (vuint8*)ptr, (vuint8*)dnsHeader, sizeof(DNSHeader_t));
if (0 != dnsHeader->responseCode) {
if (3 == dnsHeader->responseCode)
statusCode = DNSNotFound;
else
statusCode = DNSServerError;
goto errorReturn;
}
dnsHeader->xid = dns_ntohs(dnsHeader->xid);
qCnt = dns_ntohs(dnsHeader->queryCount);
aCnt = dns_ntohs(dnsHeader->answerCount);
if (dnsHeader->queryResponse &&
DNSOpQuery == dnsHeader->opCode &&
DNS_SERVER_PORT == svr_port &&
this->_dnsData.lastQueryFirstXid <= dnsHeader->xid && this->_dnsData.xid >= dnsHeader->xid &&
0 == memcmp(&svr_addr, this->_dnsData.serverIpAddr, sizeof(uint32_t))) {
statusCode = DNSServerError; // if we don't find our A record answer, the server messed up.
int i, offset = sizeof(DNSHeader_t);
uint8_t* buf = (uint8_t*)dnsHeader;
int rLen;
// read over the query section and answer section, stop on the first a record
for (i=0; i<qCnt+aCnt; i++) {
do {
read_data(this->_socket, (vuint8*)(ptr+offset), (vuint8*)buf, 1);
rLen = buf[0];
if (rLen > 128) // handle DNS name compression
offset += 2;
else
offset += rLen + 1;
} while (rLen > 0 && rLen <= 128);
// if this is an answer record, there are more fields to it.
if (i >= qCnt) {
read_data(this->_socket, (vuint8*)(ptr+offset), (vuint8*)buf, 4);
offset += 8; // skip over the 4-byte TTL field
read_data(this->_socket, (vuint8*)(ptr+offset), (vuint8*)&buf[4], 2);
offset += 2;
// if class and qtype match, and data length is 4, this is an IP address, and
// we're done.
if (1 == buf[1] && 1 == buf[3] && 4 == buf[5]) {
read_data(this->_socket, (vuint8*)(ptr+offset), (vuint8*)ipAddr, 4);
statusCode = DNSSuccess;
break;
}
} else
offset += 4; // eat the query type and class fields of a query
}
}
ptr += udp_len;
IINCHIP_WRITE(Sn_RX_RD0(this->_socket),(vuint8)((ptr & 0xff00) >> 8));
IINCHIP_WRITE((Sn_RX_RD0(this->_socket) + 1),(vuint8)(ptr & 0x00ff));
IINCHIP_WRITE(Sn_CR(this->_socket),Sn_CR_RECV);
while(IINCHIP_READ(Sn_CR(this->_socket)));
errorReturn:
if (DNSTryLater == statusCode) {
unsigned long now = millis();
if (now - this->_lastSendMillis > DNS_TIMEOUT_MILLIS || now < this->_lastSendMillis) {
this->_state = DNSStateIdle;
statusCode = DNSTimedOut;
}
} else {
this->_closeDNSSession();
this->_state = DNSStateIdle;
}
#if defined(_USE_MALLOC_)
if (NULL != dnsHeader)
free(dnsHeader);
#endif
return statusCode;
}
