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// 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.

#ifndef NET_BASE_DNS_TEST_UTIL_H_
#define NET_BASE_DNS_TEST_UTIL_H_
#pragma once

#include <deque>
#include <vector>

#include "base/logging.h"
#include "net/base/dns_transaction.h"
#include "net/base/dns_util.h"
#include "net/base/host_resolver.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_util.h"

namespace net {

// DNS related classes make use of PRNG for various tasks.  This class is
// used as a PRNG for unit testing those tasks.  It takes a deque of
// integers |numbers| which should be returned by calls to GetNext.
class TestPrng {
 public:
  explicit TestPrng(const std::deque<int>& numbers);
  ~TestPrng();

  // Pops and returns the next number from |numbers_| deque.
  int GetNext(int min, int max);

 private:
  std::deque<int> numbers_;

  DISALLOW_COPY_AND_ASSIGN(TestPrng);
};

bool operator==(const HostResolver::RequestInfo& a,
                const HostResolver::RequestInfo& b);

// Observer that just makes note of how it was called. The test code can then
// inspect to make sure it was called with the right parameters.  Used by
// HostResolverImpl and AsyncHostResolver unit tests.
class TestHostResolverObserver : public HostResolver::Observer {
 public:
  TestHostResolverObserver();
  virtual ~TestHostResolverObserver();

  // HostResolver::Observer methods:
  virtual void OnStartResolution(int id, const HostResolver::RequestInfo& info);
  virtual void OnFinishResolutionWithStatus(
      int id,
      bool was_resolved,
      const HostResolver::RequestInfo& info);
  virtual void OnCancelResolution(
      int id,
      const HostResolver::RequestInfo& info);

  // Tuple (id, info).
  struct StartOrCancelEntry {
    StartOrCancelEntry(int id, const HostResolver::RequestInfo& info)
        : id(id), info(info) {}

    bool operator==(const StartOrCancelEntry& other) const {
      return id == other.id && info == other.info;
    }

    int id;
    HostResolver::RequestInfo info;
  };

  // Tuple (id, was_resolved, info).
  struct FinishEntry {
    FinishEntry(int id, bool was_resolved,
                const HostResolver::RequestInfo& info)
        : id(id), was_resolved(was_resolved), info(info) {}

    bool operator==(const FinishEntry& other) const {
      return id == other.id &&
             was_resolved == other.was_resolved &&
             info == other.info;
    }

    int id;
    bool was_resolved;
    HostResolver::RequestInfo info;
  };

  std::vector<StartOrCancelEntry> start_log;
  std::vector<FinishEntry> finish_log;
  std::vector<StartOrCancelEntry> cancel_log;
};

// A utility function for tests that given an array of IP literals,
// converts it to an IPAddressList.
bool ConvertStringsToIPAddressList(
    const char* const ip_strings[], size_t size, IPAddressList* address_list);

// A utility function for tests that creates an IPEndPoint whose IP is
// |ip_string| and whose port is |port| and stores it in |endpoint|.
bool CreateDnsAddress(const char* ip_string, uint16 port, IPEndPoint* endpoint);

static const char kDnsIp[] = "192.168.1.1";
static const uint16 kDnsPort = 53;

//-----------------------------------------------------------------------------
// Query/response set for www.google.com, ID is fixed to 0.
static const char kT0HostName[] = "www.google.com";
static const uint16 kT0Qtype = kDNS_A;
static const char kT0DnsName[] = {
  0x03, 'w', 'w', 'w',
  0x06, 'g', 'o', 'o', 'g', 'l', 'e',
  0x03, 'c', 'o', 'm',
  0x00
};
static const uint8 kT0QueryDatagram[] = {
  // query for www.google.com, type A.
  0x00, 0x00, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x03, 0x77, 0x77, 0x77,
  0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
  0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01
};
static const uint8 kT0ResponseDatagram[] = {
  // response contains one CNAME for www.l.google.com and the following
  // IP addresses: 74.125.226.{179,180,176,177,178}
  0x00, 0x00, 0x81, 0x80, 0x00, 0x01, 0x00, 0x06,
  0x00, 0x00, 0x00, 0x00, 0x03, 0x77, 0x77, 0x77,
  0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03,
  0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
  0xc0, 0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x01,
  0x4d, 0x13, 0x00, 0x08, 0x03, 0x77, 0x77, 0x77,
  0x01, 0x6c, 0xc0, 0x10, 0xc0, 0x2c, 0x00, 0x01,
  0x00, 0x01, 0x00, 0x00, 0x00, 0xe4, 0x00, 0x04,
  0x4a, 0x7d, 0xe2, 0xb3, 0xc0, 0x2c, 0x00, 0x01,
  0x00, 0x01, 0x00, 0x00, 0x00, 0xe4, 0x00, 0x04,
  0x4a, 0x7d, 0xe2, 0xb4, 0xc0, 0x2c, 0x00, 0x01,
  0x00, 0x01, 0x00, 0x00, 0x00, 0xe4, 0x00, 0x04,
  0x4a, 0x7d, 0xe2, 0xb0, 0xc0, 0x2c, 0x00, 0x01,
  0x00, 0x01, 0x00, 0x00, 0x00, 0xe4, 0x00, 0x04,
  0x4a, 0x7d, 0xe2, 0xb1, 0xc0, 0x2c, 0x00, 0x01,
  0x00, 0x01, 0x00, 0x00, 0x00, 0xe4, 0x00, 0x04,
  0x4a, 0x7d, 0xe2, 0xb2
};
static const char* const kT0IpAddresses[] = {
  "74.125.226.179", "74.125.226.180", "74.125.226.176",
  "74.125.226.177", "74.125.226.178"
};

//-----------------------------------------------------------------------------
// Query/response set for codereview.chromium.org, ID is fixed to 1.
static const char kT1HostName[] = "codereview.chromium.org";
static const uint16 kT1Qtype = kDNS_A;
static const char kT1DnsName[] = {
  0x12, 'c', 'o', 'd', 'e', 'r', 'e', 'v', 'i', 'e', 'w',
  0x10, 'c', 'h', 'r', 'o', 'm', 'i', 'u', 'm',
  0x03, 'o', 'r', 'g',
  0x00
};
static const uint8 kT1QueryDatagram[] = {
  // query for codereview.chromium.org, type A.
  0x00, 0x01, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x0a, 0x63, 0x6f, 0x64,
  0x65, 0x72, 0x65, 0x76, 0x69, 0x65, 0x77, 0x08,
  0x63, 0x68, 0x72, 0x6f, 0x6d, 0x69, 0x75, 0x6d,
  0x03, 0x6f, 0x72, 0x67, 0x00, 0x00, 0x01, 0x00,
  0x01
};
static const uint8 kT1ResponseDatagram[] = {
  // response contains one CNAME for ghs.l.google.com and the following
  // IP address: 64.233.169.121
  0x00, 0x01, 0x81, 0x80, 0x00, 0x01, 0x00, 0x02,
  0x00, 0x00, 0x00, 0x00, 0x0a, 0x63, 0x6f, 0x64,
  0x65, 0x72, 0x65, 0x76, 0x69, 0x65, 0x77, 0x08,
  0x63, 0x68, 0x72, 0x6f, 0x6d, 0x69, 0x75, 0x6d,
  0x03, 0x6f, 0x72, 0x67, 0x00, 0x00, 0x01, 0x00,
  0x01, 0xc0, 0x0c, 0x00, 0x05, 0x00, 0x01, 0x00,
  0x01, 0x41, 0x75, 0x00, 0x12, 0x03, 0x67, 0x68,
  0x73, 0x01, 0x6c, 0x06, 0x67, 0x6f, 0x6f, 0x67,
  0x6c, 0x65, 0x03, 0x63, 0x6f, 0x6d, 0x00, 0xc0,
  0x35, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x01,
  0x0b, 0x00, 0x04, 0x40, 0xe9, 0xa9, 0x79
};
static const char* const kT1IpAddresses[] = {
  "64.233.169.121"
};

//-----------------------------------------------------------------------------
// Query/response set for www.ccs.neu.edu, ID is fixed to 2.
static const char kT2HostName[] = "www.ccs.neu.edu";
static const uint16 kT2Qtype = kDNS_A;
static const char kT2DnsName[] = {
  0x03, 'w', 'w', 'w',
  0x03, 'c', 'c', 'c',
  0x03, 'n', 'e', 'u',
  0x03, 'e', 'd', 'u',
  0x00
};
static const uint8 kT2QueryDatagram[] = {
  // query for www.ccs.neu.edu, type A.
  0x00, 0x02, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x03, 0x77, 0x77, 0x77,
  0x03, 0x63, 0x63, 0x73, 0x03, 0x6e, 0x65, 0x75,
  0x03, 0x65, 0x64, 0x75, 0x00, 0x00, 0x01, 0x00,
  0x01
};
static const uint8 kT2ResponseDatagram[] = {
  // response contains one CNAME for vulcan.ccs.neu.edu and the following
  // IP address: 129.10.116.81
  0x00, 0x02, 0x81, 0x80, 0x00, 0x01, 0x00, 0x02,
  0x00, 0x00, 0x00, 0x00, 0x03, 0x77, 0x77, 0x77,
  0x03, 0x63, 0x63, 0x73, 0x03, 0x6e, 0x65, 0x75,
  0x03, 0x65, 0x64, 0x75, 0x00, 0x00, 0x01, 0x00,
  0x01, 0xc0, 0x0c, 0x00, 0x05, 0x00, 0x01, 0x00,
  0x00, 0x01, 0x2c, 0x00, 0x09, 0x06, 0x76, 0x75,
  0x6c, 0x63, 0x61, 0x6e, 0xc0, 0x10, 0xc0, 0x2d,
  0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x01, 0x2c,
  0x00, 0x04, 0x81, 0x0a, 0x74, 0x51
};
static const char* const kT2IpAddresses[] = {
  "129.10.116.81"
};

//-----------------------------------------------------------------------------
// Query/response set for www.google.az, ID is fixed to 3.
static const char kT3HostName[] = "www.google.az";
static const uint16 kT3Qtype = kDNS_A;
static const char kT3DnsName[] = {
  0x03, 'w', 'w', 'w',
  0x06, 'g', 'o', 'o', 'g', 'l', 'e',
  0x02, 'a', 'z',
  0x00
};
static const uint8 kT3QueryDatagram[] = {
  // query for www.google.az, type A.
  0x00, 0x03, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x03, 0x77, 0x77, 0x77,
  0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x02,
  0x61, 0x7a, 0x00, 0x00, 0x01, 0x00, 0x01
};
static const uint8 kT3ResponseDatagram[] = {
  // response contains www.google.com as CNAME for www.google.az and
  // www.l.google.com as CNAME for www.google.com and the following
  // IP addresses: 74.125.226.{178,179,180,176,177}
  0x00, 0x03, 0x81, 0x80, 0x00, 0x01, 0x00, 0x07,
  0x00, 0x00, 0x00, 0x00, 0x03, 0x77, 0x77, 0x77,
  0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x02,
  0x61, 0x7a, 0x00, 0x00, 0x01, 0x00, 0x01, 0xc0,
  0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x01, 0x50,
  0x99, 0x00, 0x10, 0x03, 0x77, 0x77, 0x77, 0x06,
  0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03, 0x63,
  0x6f, 0x6d, 0x00, 0xc0, 0x2b, 0x00, 0x05, 0x00,
  0x01, 0x00, 0x01, 0x50, 0x99, 0x00, 0x08, 0x03,
  0x77, 0x77, 0x77, 0x01, 0x6c, 0xc0, 0x2f, 0xc0,
  0x47, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00,
  0x15, 0x00, 0x04, 0x4a, 0x7d, 0xe2, 0xb2, 0xc0,
  0x47, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00,
  0x15, 0x00, 0x04, 0x4a, 0x7d, 0xe2, 0xb3, 0xc0,
  0x47, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00,
  0x15, 0x00, 0x04, 0x4a, 0x7d, 0xe2, 0xb4, 0xc0,
  0x47, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00,
  0x15, 0x00, 0x04, 0x4a, 0x7d, 0xe2, 0xb0, 0xc0,
  0x47, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00,
  0x15, 0x00, 0x04, 0x4a, 0x7d, 0xe2, 0xb1
};
static const char* const kT3IpAddresses[] = {
  "74.125.226.178", "74.125.226.179", "74.125.226.180",
  "74.125.226.176", "74.125.226.177"
};

}  // namespace net

#endif  // NET_BASE_DNS_TEST_UTIL_H_