Revert 87809 - Added DnsQuery class

net/base/dns_response.cc

Index: net/base/dns_response.cc
===================================================================
--- net/base/dns_response.cc	(revision 87811)
+++ net/base/dns_response.cc	(working copy)
@@ -1,103 +0,0 @@
-// Copyright (c) 2011 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.
-
-#include "net/base/dns_response.h"
-
-#include "net/base/address_list.h"
-#include "net/base/dns_util.h"
-#include "net/base/net_errors.h"
-
-namespace net {
-
-// RFC 1035, section 4.2.1: Messages carried by UDP are restricted to 512
-// bytes (not counting the IP nor UDP headers).
-static const int kMaxResponseSize = 512;
-
-DnsResponse::DnsResponse(DnsQuery* query)
-    : query_(query),
-      io_buffer_(new IOBufferWithSize(kMaxResponseSize + 1)) {
-  DCHECK(query_);
-  DCHECK(query_->IsValid());
-}
-
-int DnsResponse::Parse(int nbytes, AddressList* results) {
-  DCHECK(query_->IsValid());
-
-  // Response includes query, it should be at least that size.
-  if (nbytes < query_->io_buffer()->size() || nbytes > kMaxResponseSize)
-    return ERR_DNS_MALFORMED_RESPONSE;
-
-  DnsResponseBuffer response(reinterpret_cast<uint8*>(io_buffer_->data()),
-                             io_buffer_->size());
-  uint16 id;
-  if (!response.U16(&id) || id != query_->id()) // Make sure IDs match.
-    return ERR_DNS_MALFORMED_RESPONSE;
-
-  uint8 flags, rcode;
-  if (!response.U8(&flags) || !response.U8(&rcode))
-    return ERR_DNS_MALFORMED_RESPONSE;
-
-  if (flags & 2) // TC is set -- server wants TCP, we don't support it (yet?).
-    return ERR_DNS_SERVER_REQUIRES_TCP;
-
-  rcode &= 0x0f;         // 3 means NXDOMAIN, the rest means server failed.
-  if (rcode && (rcode != 3))
-    return ERR_DNS_SERVER_FAILED;
-
-  uint16 query_count, answer_count, authority_count, additional_count;
-  if (!response.U16(&query_count) ||
-      !response.U16(&answer_count) ||
-      !response.U16(&authority_count) ||
-      !response.U16(&additional_count)) {
-    return ERR_DNS_MALFORMED_RESPONSE;
-  }
-
-  if (query_count != 1) // Sent a single question, shouldn't have changed.
-    return ERR_DNS_MALFORMED_RESPONSE;
-
-  std::string hostname;
-  uint16 qtype, qclass;
-  if (!response.DNSName(&hostname) ||
-      !response.U16(&qtype) ||
-      !response.U16(&qclass) ||
-      hostname != query_->hostname() || // Make sure Question section
-      qtype != query_->qtype() ||       // echoed back.
-      qclass != kClassIN) {
-    return ERR_DNS_MALFORMED_RESPONSE;
-  }
-
-  if (answer_count < 1)
-    return ERR_NAME_NOT_RESOLVED;
-
-  std::vector<IPAddressNumber> rdatas;
-  while (answer_count--) {
-    uint32 ttl;
-    uint16 rdlength;
-    if (!response.DNSName(NULL) ||
-        !response.U16(&qtype) ||
-        !response.U16(&qclass) ||
-        !response.U32(&ttl) ||
-        !response.U16(&rdlength)) {
-      return ERR_DNS_MALFORMED_RESPONSE;
-    }
-
-    if (qtype == query_->qtype() &&
-        qclass == kClassIN &&
-        (rdlength == kIPv4AddressSize || rdlength == kIPv6AddressSize)) {
-      base::StringPiece rdata;
-      if (!response.Block(&rdata, rdlength))
-        return ERR_DNS_MALFORMED_RESPONSE;
-      rdatas.push_back(IPAddressNumber(rdata.begin(), rdata.end()));
-    } else if (!response.Skip(rdlength))
-      return ERR_DNS_MALFORMED_RESPONSE;
-  }
-
-  if (rdatas.empty())
-    return ERR_NAME_NOT_RESOLVED;
-
-  *results = AddressList::CreateFromIPAddressList(rdatas, query_->port());
-  return OK;
-}
-
-}  // namespace net