Moved libraries folder inside platform folder. Now libraries and examples are searched per board/platform

1 files changed, 423 insertions, 0 deletions

diff --git a/libraries/Ethernet/Dns.cpp b/libraries/Ethernet/Dns.cpp
new file mode 100644
index 0000000..b3c1a9d
--- /dev/null
+++ b/libraries/Ethernet/Dns.cpp
@@ -0,0 +1,423 @@
+// Arduino DNS client for WizNet5100-based Ethernet shield
+// (c) Copyright 2009-2010 MCQN Ltd.
+// Released under Apache License, version 2.0
+
+#include "w5100.h"
+#include "EthernetUdp.h"
+#include "util.h"
+
+#include "Dns.h"
+#include <string.h>
+//#include <stdlib.h>
+#include "Arduino.h"
+
+
+#define SOCKET_NONE	255
+// Various flags and header field values for a DNS message
+#define UDP_HEADER_SIZE	8
+#define DNS_HEADER_SIZE	12
+#define TTL_SIZE        4
+#define QUERY_FLAG               (0)
+#define RESPONSE_FLAG            (1<<15)
+#define QUERY_RESPONSE_MASK      (1<<15)
+#define OPCODE_STANDARD_QUERY    (0)
+#define OPCODE_INVERSE_QUERY     (1<<11)
+#define OPCODE_STATUS_REQUEST    (2<<11)
+#define OPCODE_MASK              (15<<11)
+#define AUTHORITATIVE_FLAG       (1<<10)
+#define TRUNCATION_FLAG          (1<<9)
+#define RECURSION_DESIRED_FLAG   (1<<8)
+#define RECURSION_AVAILABLE_FLAG (1<<7)
+#define RESP_NO_ERROR            (0)
+#define RESP_FORMAT_ERROR        (1)
+#define RESP_SERVER_FAILURE      (2)
+#define RESP_NAME_ERROR          (3)
+#define RESP_NOT_IMPLEMENTED     (4)
+#define RESP_REFUSED             (5)
+#define RESP_MASK                (15)
+#define TYPE_A                   (0x0001)
+#define CLASS_IN                 (0x0001)
+#define LABEL_COMPRESSION_MASK   (0xC0)
+// Port number that DNS servers listen on
+#define DNS_PORT        53
+
+// Possible return codes from ProcessResponse
+#define SUCCESS          1
+#define TIMED_OUT        -1
+#define INVALID_SERVER   -2
+#define TRUNCATED        -3
+#define INVALID_RESPONSE -4
+
+void DNSClient::begin(const IPAddress& aDNSServer)
+{
+    iDNSServer = aDNSServer;
+    iRequestId = 0;
+}
+
+
+int DNSClient::inet_aton(const char* aIPAddrString, IPAddress& aResult)
+{
+    // See if we've been given a valid IP address
+    const char* p =aIPAddrString;
+    while (*p &&
+           ( (*p == '.') || (*p >= '0') || (*p <= '9') ))
+    {
+        p++;
+    }
+
+    if (*p == '\0')
+    {
+        // It's looking promising, we haven't found any invalid characters
+        p = aIPAddrString;
+        int segment =0;
+        int segmentValue =0;
+        while (*p && (segment < 4))
+        {
+            if (*p == '.')
+            {
+                // We've reached the end of a segment
+                if (segmentValue > 255)
+                {
+                    // You can't have IP address segments that don't fit in a byte
+                    return 0;
+                }
+                else
+                {
+                    aResult[segment] = (byte)segmentValue;
+                    segment++;
+                    segmentValue = 0;
+                }
+            }
+            else
+            {
+                // Next digit
+                segmentValue = (segmentValue*10)+(*p - '0');
+            }
+            p++;
+        }
+        // We've reached the end of address, but there'll still be the last
+        // segment to deal with
+        if ((segmentValue > 255) || (segment > 3))
+        {
+            // You can't have IP address segments that don't fit in a byte,
+            // or more than four segments
+            return 0;
+        }
+        else
+        {
+            aResult[segment] = (byte)segmentValue;
+            return 1;
+        }
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+int DNSClient::getHostByName(const char* aHostname, IPAddress& aResult)
+{
+    int ret =0;
+
+    // See if it's a numeric IP address
+    if (inet_aton(aHostname, aResult))
+    {
+        // It is, our work here is done
+        return 1;
+    }
+
+    // Check we've got a valid DNS server to use
+    if (iDNSServer == INADDR_NONE)
+    {
+        return INVALID_SERVER;
+    }
+	
+    // Find a socket to use
+    if (iUdp.begin(1024+(millis() & 0xF)) == 1)
+    {
+        // Try up to three times
+        int retries = 0;
+//        while ((retries < 3) && (ret <= 0))
+        {
+            // Send DNS request
+            ret = iUdp.beginPacket(iDNSServer, DNS_PORT);
+            if (ret != 0)
+            {
+                // Now output the request data
+                ret = BuildRequest(aHostname);
+                if (ret != 0)
+                {
+                    // And finally send the request
+                    ret = iUdp.endPacket();
+                    if (ret != 0)
+                    {
+                        // Now wait for a response
+                        int wait_retries = 0;
+                        ret = TIMED_OUT;
+                        while ((wait_retries < 3) && (ret == TIMED_OUT))
+                        {
+                            ret = ProcessResponse(5000, aResult);
+                            wait_retries++;
+                        }
+                    }
+                }
+            }
+            retries++;
+        }
+
+        // We're done with the socket now
+        iUdp.stop();
+    }
+
+    return ret;
+}
+
+uint16_t DNSClient::BuildRequest(const char* aName)
+{
+    // Build header
+    //                                    1  1  1  1  1  1
+    //      0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
+    //    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    //    |                      ID                       |
+    //    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    //    |QR|   Opcode  |AA|TC|RD|RA|   Z    |   RCODE   |
+    //    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    //    |                    QDCOUNT                    |
+    //    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    //    |                    ANCOUNT                    |
+    //    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    //    |                    NSCOUNT                    |
+    //    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    //    |                    ARCOUNT                    |
+    //    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+    // As we only support one request at a time at present, we can simplify
+    // some of this header
+    iRequestId = millis(); // generate a random ID
+    uint16_t twoByteBuffer;
+
+    // FIXME We should also check that there's enough space available to write to, rather
+    // FIXME than assume there's enough space (as the code does at present)
+    iUdp.write((uint8_t*)&iRequestId, sizeof(iRequestId));
+
+    twoByteBuffer = htons(QUERY_FLAG | OPCODE_STANDARD_QUERY | RECURSION_DESIRED_FLAG);
+    iUdp.write((uint8_t*)&twoByteBuffer, sizeof(twoByteBuffer));
+
+    twoByteBuffer = htons(1);  // One question record
+    iUdp.write((uint8_t*)&twoByteBuffer, sizeof(twoByteBuffer));
+
+    twoByteBuffer = 0;  // Zero answer records
+    iUdp.write((uint8_t*)&twoByteBuffer, sizeof(twoByteBuffer));
+
+    iUdp.write((uint8_t*)&twoByteBuffer, sizeof(twoByteBuffer));
+    // and zero additional records
+    iUdp.write((uint8_t*)&twoByteBuffer, sizeof(twoByteBuffer));
+
+    // Build question
+    const char* start =aName;
+    const char* end =start;
+    uint8_t len;
+    // Run through the name being requested
+    while (*end)
+    {
+        // Find out how long this section of the name is
+        end = start;
+        while (*end && (*end != '.') )
+        {
+            end++;
+        }
+
+        if (end-start > 0)
+        {
+            // Write out the size of this section
+            len = end-start;
+            iUdp.write(&len, sizeof(len));
+            // And then write out the section
+            iUdp.write((uint8_t*)start, end-start);
+        }
+        start = end+1;
+    }
+
+    // We've got to the end of the question name, so
+    // terminate it with a zero-length section
+    len = 0;
+    iUdp.write(&len, sizeof(len));
+    // Finally the type and class of question
+    twoByteBuffer = htons(TYPE_A);
+    iUdp.write((uint8_t*)&twoByteBuffer, sizeof(twoByteBuffer));
+
+    twoByteBuffer = htons(CLASS_IN);  // Internet class of question
+    iUdp.write((uint8_t*)&twoByteBuffer, sizeof(twoByteBuffer));
+    // Success!  Everything buffered okay
+    return 1;
+}
+
+
+uint16_t DNSClient::ProcessResponse(uint16_t aTimeout, IPAddress& aAddress)
+{
+    uint32_t startTime = millis();
+
+    // Wait for a response packet
+    while(iUdp.parsePacket() <= 0)
+    {
+        if((millis() - startTime) > aTimeout)
+            return TIMED_OUT;
+        delay(50);
+    }
+
+    // We've had a reply!
+    // Read the UDP header
+    uint8_t header[DNS_HEADER_SIZE]; // Enough space to reuse for the DNS header
+    // Check that it's a response from the right server and the right port
+    if ( (iDNSServer != iUdp.remoteIP()) || 
+        (iUdp.remotePort() != DNS_PORT) )
+    {
+        // It's not from who we expected
+        return INVALID_SERVER;
+    }
+
+    // Read through the rest of the response
+    if (iUdp.available() < DNS_HEADER_SIZE)
+    {
+        return TRUNCATED;
+    }
+    iUdp.read(header, DNS_HEADER_SIZE);
+
+    uint16_t header_flags = htons(*((uint16_t*)&header[2]));
+    // Check that it's a response to this request
+    if ( ( iRequestId != (*((uint16_t*)&header[0])) ) ||
+        ((header_flags & QUERY_RESPONSE_MASK) != (uint16_t)RESPONSE_FLAG) )
+    {
+        // Mark the entire packet as read
+        iUdp.flush();
+        return INVALID_RESPONSE;
+    }
+    // Check for any errors in the response (or in our request)
+    // although we don't do anything to get round these
+    if ( (header_flags & TRUNCATION_FLAG) || (header_flags & RESP_MASK) )
+    {
+        // Mark the entire packet as read
+        iUdp.flush();
+        return -5; //INVALID_RESPONSE;
+    }
+
+    // And make sure we've got (at least) one answer
+    uint16_t answerCount = htons(*((uint16_t*)&header[6]));
+    if (answerCount == 0 )
+    {
+        // Mark the entire packet as read
+        iUdp.flush();
+        return -6; //INVALID_RESPONSE;
+    }
+
+    // Skip over any questions
+    for (uint16_t i =0; i < htons(*((uint16_t*)&header[4])); i++)
+    {
+        // Skip over the name
+        uint8_t len;
+        do
+        {
+            iUdp.read(&len, sizeof(len));
+            if (len > 0)
+            {
+                // Don't need to actually read the data out for the string, just
+                // advance ptr to beyond it
+                while(len--)
+                {
+                    iUdp.read(); // we don't care about the returned byte
+                }
+            }
+        } while (len != 0);
+
+        // Now jump over the type and class
+        for (int i =0; i < 4; i++)
+        {
+            iUdp.read(); // we don't care about the returned byte
+        }
+    }
+
+    // Now we're up to the bit we're interested in, the answer
+    // There might be more than one answer (although we'll just use the first
+    // type A answer) and some authority and additional resource records but
+    // we're going to ignore all of them.
+
+    for (uint16_t i =0; i < answerCount; i++)
+    {
+        // Skip the name
+        uint8_t len;
+        do
+        {
+            iUdp.read(&len, sizeof(len));
+            if ((len & LABEL_COMPRESSION_MASK) == 0)
+            {
+                // It's just a normal label
+                if (len > 0)
+                {
+                    // And it's got a length
+                    // Don't need to actually read the data out for the string,
+                    // just advance ptr to beyond it
+                    while(len--)
+                    {
+                        iUdp.read(); // we don't care about the returned byte
+                    }
+                }
+            }
+            else
+            {
+                // This is a pointer to a somewhere else in the message for the
+                // rest of the name.  We don't care about the name, and RFC1035
+                // says that a name is either a sequence of labels ended with a
+                // 0 length octet or a pointer or a sequence of labels ending in
+                // a pointer.  Either way, when we get here we're at the end of
+                // the name
+                // Skip over the pointer
+                iUdp.read(); // we don't care about the returned byte
+                // And set len so that we drop out of the name loop
+                len = 0;
+            }
+        } while (len != 0);
+
+        // Check the type and class
+        uint16_t answerType;
+        uint16_t answerClass;
+        iUdp.read((uint8_t*)&answerType, sizeof(answerType));
+        iUdp.read((uint8_t*)&answerClass, sizeof(answerClass));
+
+        // Ignore the Time-To-Live as we don't do any caching
+        for (int i =0; i < TTL_SIZE; i++)
+        {
+            iUdp.read(); // we don't care about the returned byte
+        }
+
+        // And read out the length of this answer
+        // Don't need header_flags anymore, so we can reuse it here
+        iUdp.read((uint8_t*)&header_flags, sizeof(header_flags));
+
+        if ( (htons(answerType) == TYPE_A) && (htons(answerClass) == CLASS_IN) )
+        {
+            if (htons(header_flags) != 4)
+            {
+                // It's a weird size
+                // Mark the entire packet as read
+                iUdp.flush();
+                return -9;//INVALID_RESPONSE;
+            }
+            iUdp.read(aAddress.raw_address(), 4);
+            return SUCCESS;
+        }
+        else
+        {
+            // This isn't an answer type we're after, move onto the next one
+            for (uint16_t i =0; i < htons(header_flags); i++)
+            {
+                iUdp.read(); // we don't care about the returned byte
+            }
+        }
+    }
+
+    // Mark the entire packet as read
+    iUdp.flush();
+
+    // If we get here then we haven't found an answer
+    return -10;//INVALID_RESPONSE;
+}
+