Finished DNS-SD server. Finished Privet-specified DNS-SD server.

Review URL: https://chromiumcodereview.appspot.com/16975004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208064 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 78 insertions, 0 deletions

diff --git a/cloud_print/gcp20/prototype/dns_packet_parser.h b/cloud_print/gcp20/prototype/dns_packet_parser.h
new file mode 100644
index 0000000..88c6a03
--- /dev/null
+++ b/cloud_print/gcp20/prototype/dns_packet_parser.h
@@ -0,0 +1,78 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CLOUD_PRINT_GCP20_PROTOTYPE_DNS_PACKET_PARSER_H_
+#define CLOUD_PRINT_GCP20_PROTOTYPE_DNS_PACKET_PARSER_H_
+
+#include <string>
+
+#include "net/dns/dns_protocol.h"
+#include "net/dns/dns_response.h"
+
+// Parsed response record.
+struct DnsQueryRecord {
+  DnsQueryRecord() : qtype(0), qclass(0) {}
+  ~DnsQueryRecord() {}
+
+  std::string qname;  // in dotted form
+  uint16 qtype;
+  uint16 qclass;
+};
+
+// Iterator to walk over records of the DNS response packet. Encapsulates
+// |DnsRecordParser| object for using its functionality.
+class DnsPacketParser {
+ public:
+  // Constructs an iterator to process the |packet| of given |length|.
+  DnsPacketParser(const char* packet, size_t length);
+
+  // Destroys the object.
+  ~DnsPacketParser() {}
+
+  bool IsValid() const { return record_parser_.IsValid() && is_header_read_; }
+
+  // Returns |true| if no more bytes remain in the packet.
+  bool AtEnd() const { return record_parser_.AtEnd(); }
+
+  // Returns header of DNS packet.
+  const net::dns_protocol::Header& header() const { return header_; }
+
+  // Parses the next query record into |record|. Returns true if succeeded.
+  bool ReadRecord(DnsQueryRecord* record);
+
+  // Parses the next resource record into |record|. Returns true if succeeded.
+  bool ReadRecord(net::DnsResourceRecord* record) {
+    return record_parser_.ReadRecord(record);
+  }
+
+ private:
+  // Returns current offset into the packet.
+  size_t GetOffset() const { return record_parser_.GetOffset(); }
+
+  // Parses a (possibly compressed) DNS name from the packet starting at
+  // |pos|. Stores output (even partial) in |out| unless |out| is NULL. |out|
+  // is stored in the dotted form, e.g., "example.com". Returns number of bytes
+  // consumed or 0 on failure.
+  // This is exposed to allow parsing compressed names within RRDATA for TYPEs
+  // such as NS, CNAME, PTR, MX, SOA.
+  // See RFC 1035 section 4.1.4.
+  unsigned ReadName(std::string* out) const {
+    return record_parser_.ReadName(packet_ + GetOffset(), out);
+  }
+
+  const char* packet_;
+  size_t length_;
+
+  // Contents parsed header_;
+  net::dns_protocol::Header header_;
+  bool is_header_read_;
+
+  // Encapsulated parser.
+  net::DnsRecordParser record_parser_;
+
+  DISALLOW_COPY_AND_ASSIGN(DnsPacketParser);
+};
+
+#endif  // CLOUD_PRINT_GCP20_PROTOTYPE_DNS_PACKET_PARSER_H_
+