// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/base/ip_endpoint.h"

#include <string.h>

#include <optional>
#include <string>
#include <tuple>

#include "base/check_op.h"
#include "base/notreached.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_number_conversions.h"
#include "base/sys_byteorder.h"
#include "base/values.h"
#include "build/build_config.h"
#include "net/base/ip_address.h"
#include "net/base/sockaddr_storage.h"
#include "net/base/sys_addrinfo.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/platform_test.h"

#if BUILDFLAG(IS_WIN)
#include <winsock2.h>

#include <ws2bth.h>

#include "base/test/gtest_util.h"   // For EXPECT_DCHECK_DEATH
#include "net/base/winsock_util.h"  // For kBluetoothAddressSize
#elif BUILDFLAG(IS_POSIX)
#include <netinet/in.h>
#endif

using testing::Optional;

namespace net {

namespace {

// Retuns the port field of the |sockaddr|.
const uint16_t* GetPortFieldFromSockaddr(const struct sockaddr* address,
                                         socklen_t address_len) {
  if (address->sa_family == AF_INET) {
    DCHECK_LE(sizeof(sockaddr_in), static_cast<size_t>(address_len));
    const struct sockaddr_in* sockaddr =
        reinterpret_cast<const struct sockaddr_in*>(address);
    return &sockaddr->sin_port;
  } else if (address->sa_family == AF_INET6) {
    DCHECK_LE(sizeof(sockaddr_in6), static_cast<size_t>(address_len));
    const struct sockaddr_in6* sockaddr =
        reinterpret_cast<const struct sockaddr_in6*>(address);
    return &sockaddr->sin6_port;
  } else {
    NOTREACHED_IN_MIGRATION();
    return nullptr;
  }
}

// Returns the value of port in |sockaddr| (in host byte ordering).
int GetPortFromSockaddr(const struct sockaddr* address, socklen_t address_len) {
  const uint16_t* port_field = GetPortFieldFromSockaddr(address, address_len);
  if (!port_field)
    return -1;
  return base::NetToHost16(*port_field);
}

struct TestData {
  std::string host;
  std::string host_normalized;
  bool ipv6;
  IPAddress ip_address;
} tests[] = {
    {"127.0.00.1", "127.0.0.1", false},
    {"192.168.1.1", "192.168.1.1", false},
    {"::1", "[::1]", true},
    {"2001:db8:0::42", "[2001:db8::42]", true},
};

class IPEndPointTest : public PlatformTest {
 public:
  void SetUp() override {
    // This is where we populate the TestData.
    for (auto& test : tests) {
      EXPECT_TRUE(test.ip_address.AssignFromIPLiteral(test.host));
    }
  }
};

TEST_F(IPEndPointTest, Constructor) {
  {
    IPEndPoint endpoint;
    EXPECT_EQ(0, endpoint.port());
  }

  for (const auto& test : tests) {
    IPEndPoint endpoint(test.ip_address, 80);
    EXPECT_EQ(80, endpoint.port());
    EXPECT_EQ(test.ip_address, endpoint.address());
  }
}

TEST_F(IPEndPointTest, Assignment) {
  uint16_t port = 0;
  for (const auto& test : tests) {
    IPEndPoint src(test.ip_address, ++port);
    IPEndPoint dest = src;

    EXPECT_EQ(src.port(), dest.port());
    EXPECT_EQ(src.address(), dest.address());
  }
}

TEST_F(IPEndPointTest, Copy) {
  uint16_t port = 0;
  for (const auto& test : tests) {
    IPEndPoint src(test.ip_address, ++port);
    IPEndPoint dest(src);

    EXPECT_EQ(src.port(), dest.port());
    EXPECT_EQ(src.address(), dest.address());
  }
}

TEST_F(IPEndPointTest, ToFromSockAddr) {
  uint16_t port = 0;
  for (const auto& test : tests) {
    IPEndPoint ip_endpoint(test.ip_address, ++port);

    // Convert to a sockaddr.
    SockaddrStorage storage;
    EXPECT_TRUE(ip_endpoint.ToSockAddr(storage.addr, &storage.addr_len));

    // Basic verification.
    socklen_t expected_size =
        test.ipv6 ? sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
    EXPECT_EQ(expected_size, storage.addr_len);
    EXPECT_EQ(ip_endpoint.port(),
              GetPortFromSockaddr(storage.addr, storage.addr_len));
    // And convert back to an IPEndPoint.
    IPEndPoint ip_endpoint2;
    EXPECT_TRUE(ip_endpoint2.FromSockAddr(storage.addr, storage.addr_len));
    EXPECT_EQ(ip_endpoint.port(), ip_endpoint2.port());
    EXPECT_EQ(ip_endpoint.address(), ip_endpoint2.address());
  }
}

TEST_F(IPEndPointTest, ToSockAddrBufTooSmall) {
  uint16_t port = 0;
  for (const auto& test : tests) {
    IPEndPoint ip_endpoint(test.ip_address, port);

    SockaddrStorage storage;
    storage.addr_len = 3;  // size is too small!
    EXPECT_FALSE(ip_endpoint.ToSockAddr(storage.addr, &storage.addr_len));
  }
}

TEST_F(IPEndPointTest, FromSockAddrBufTooSmall) {
  struct sockaddr_in addr;
  memset(&addr, 0, sizeof(addr));
  addr.sin_family = AF_INET;
  IPEndPoint ip_endpoint;
  struct sockaddr* sockaddr = reinterpret_cast<struct sockaddr*>(&addr);
  EXPECT_FALSE(ip_endpoint.FromSockAddr(sockaddr, sizeof(addr) - 1));
}

#if BUILDFLAG(IS_WIN)

namespace {
constexpr uint8_t kBluetoothAddrBytes[kBluetoothAddressSize] = {1, 2, 3,
                                                                4, 5, 6};
constexpr uint8_t kBluetoothAddrBytes2[kBluetoothAddressSize] = {1, 2, 3,
                                                                 4, 5, 7};
const IPAddress kBluetoothAddress(kBluetoothAddrBytes);
const IPAddress kBluetoothAddress2(kBluetoothAddrBytes2);

// Select a Bluetooth port that does not fit in a uint16_t.
constexpr uint32_t kBluetoothPort = std::numeric_limits<uint16_t>::max() + 1;

SOCKADDR_BTH BuildBluetoothSockAddr(const IPAddress& ip_address,
                                    uint32_t port) {
  SOCKADDR_BTH addr = {};
  addr.addressFamily = AF_BTH;
  DCHECK_LE(ip_address.bytes().size(), sizeof(addr.btAddr));
  memcpy(&addr.btAddr, ip_address.bytes().data(), ip_address.bytes().size());
  addr.port = port;
  return addr;
}
}  // namespace

TEST_F(IPEndPointTest, WinBluetoothSockAddrCompareWithSelf) {
  IPEndPoint bt_endpoint;
  SOCKADDR_BTH addr = BuildBluetoothSockAddr(kBluetoothAddress, kBluetoothPort);
  EXPECT_TRUE(bt_endpoint.FromSockAddr(
      reinterpret_cast<const struct sockaddr*>(&addr), sizeof(addr)));
  EXPECT_EQ(bt_endpoint.address(), kBluetoothAddress);
  EXPECT_EQ(bt_endpoint.GetFamily(), AddressFamily::ADDRESS_FAMILY_UNSPECIFIED);
  EXPECT_EQ(bt_endpoint.GetSockAddrFamily(), AF_BTH);
  // Comparison functions should agree that `bt_endpoint` equals itself.
  EXPECT_FALSE(bt_endpoint < bt_endpoint);
  EXPECT_FALSE(bt_endpoint != bt_endpoint);
  EXPECT_TRUE(bt_endpoint == bt_endpoint);
  // Test that IPv4/IPv6-only methods crash.
  EXPECT_DCHECK_DEATH(bt_endpoint.port());
  SockaddrStorage storage;
  EXPECT_DCHECK_DEATH(
      std::ignore = bt_endpoint.ToSockAddr(storage.addr, &storage.addr_len));
  EXPECT_DCHECK_DEATH(bt_endpoint.ToString());
  EXPECT_DCHECK_DEATH(bt_endpoint.ToStringWithoutPort());
}

TEST_F(IPEndPointTest, WinBluetoothSockAddrCompareWithNonBluetooth) {
  IPEndPoint bt_endpoint;
  SOCKADDR_BTH addr = BuildBluetoothSockAddr(kBluetoothAddress, kBluetoothPort);
  EXPECT_TRUE(bt_endpoint.FromSockAddr(
      reinterpret_cast<const struct sockaddr*>(&addr), sizeof(addr)));

  // Compare `bt_endpoint` with non-Bluetooth endpoints.
  for (const auto& test : tests) {
    IPEndPoint endpoint(test.ip_address, 80);
    if (test.ip_address.IsIPv4()) {
      EXPECT_FALSE(bt_endpoint < endpoint);
    } else {
      EXPECT_TRUE(test.ip_address.IsIPv6());
      EXPECT_TRUE(bt_endpoint < endpoint);
    }
    EXPECT_TRUE(bt_endpoint != endpoint);
    EXPECT_FALSE(bt_endpoint == endpoint);
  }
}

TEST_F(IPEndPointTest, WinBluetoothSockAddrCompareWithCopy) {
  IPEndPoint bt_endpoint;
  SOCKADDR_BTH addr = BuildBluetoothSockAddr(kBluetoothAddress, kBluetoothPort);
  EXPECT_TRUE(bt_endpoint.FromSockAddr(
      reinterpret_cast<const struct sockaddr*>(&addr), sizeof(addr)));

  // Verify that a copy's accessors return the same values as the original's.
  IPEndPoint bt_endpoint_other(bt_endpoint);
  EXPECT_EQ(bt_endpoint.address(), bt_endpoint_other.address());
  EXPECT_EQ(bt_endpoint.GetFamily(), bt_endpoint_other.GetFamily());
  EXPECT_EQ(bt_endpoint.GetSockAddrFamily(),
            bt_endpoint_other.GetSockAddrFamily());
  // Comparison functions should agree that the endpoints are equal.
  EXPECT_FALSE(bt_endpoint < bt_endpoint_other);
  EXPECT_FALSE(bt_endpoint != bt_endpoint_other);
  EXPECT_TRUE(bt_endpoint == bt_endpoint_other);
  // Test that IPv4/IPv6-only methods crash.
  EXPECT_DCHECK_DEATH(bt_endpoint_other.port());
  SockaddrStorage storage;
  EXPECT_DCHECK_DEATH(std::ignore = bt_endpoint_other.ToSockAddr(
                          storage.addr, &storage.addr_len));
  EXPECT_DCHECK_DEATH(bt_endpoint_other.ToString());
  EXPECT_DCHECK_DEATH(bt_endpoint_other.ToStringWithoutPort());
}

TEST_F(IPEndPointTest, WinBluetoothSockAddrCompareWithDifferentPort) {
  IPEndPoint bt_endpoint;
  SOCKADDR_BTH addr = BuildBluetoothSockAddr(kBluetoothAddress, kBluetoothPort);
  EXPECT_TRUE(bt_endpoint.FromSockAddr(
      reinterpret_cast<const struct sockaddr*>(&addr), sizeof(addr)));

  // Compare with another IPEndPoint that has a different port.
  IPEndPoint bt_endpoint_other;
  SOCKADDR_BTH addr2 =
      BuildBluetoothSockAddr(kBluetoothAddress, kBluetoothPort + 1);
  EXPECT_TRUE(bt_endpoint_other.FromSockAddr(
      reinterpret_cast<const struct sockaddr*>(&addr2), sizeof(addr2)));
  EXPECT_EQ(bt_endpoint.address(), bt_endpoint_other.address());
  EXPECT_EQ(bt_endpoint.GetFamily(), bt_endpoint_other.GetFamily());
  EXPECT_EQ(bt_endpoint.GetSockAddrFamily(),
            bt_endpoint_other.GetSockAddrFamily());
  // Comparison functions should agree that `bt_endpoint == bt_endpoint_other`
  // because they have the same address and Bluetooth ports are not considered
  // by comparison functions.
  EXPECT_FALSE(bt_endpoint < bt_endpoint_other);
  EXPECT_FALSE(bt_endpoint != bt_endpoint_other);
  EXPECT_TRUE(bt_endpoint == bt_endpoint_other);
  // Test that IPv4/IPv6-only methods crash.
  EXPECT_DCHECK_DEATH(bt_endpoint_other.port());
  SockaddrStorage storage;
  EXPECT_DCHECK_DEATH(std::ignore = bt_endpoint_other.ToSockAddr(
                          storage.addr, &storage.addr_len));
  EXPECT_DCHECK_DEATH(bt_endpoint_other.ToString());
  EXPECT_DCHECK_DEATH(bt_endpoint_other.ToStringWithoutPort());
}

TEST_F(IPEndPointTest, WinBluetoothSockAddrCompareWithDifferentAddress) {
  IPEndPoint bt_endpoint;
  SOCKADDR_BTH addr = BuildBluetoothSockAddr(kBluetoothAddress, kBluetoothPort);
  EXPECT_TRUE(bt_endpoint.FromSockAddr(
      reinterpret_cast<const struct sockaddr*>(&addr), sizeof(addr)));

  // Compare with another IPEndPoint that has a different address.
  IPEndPoint bt_endpoint_other;
  SOCKADDR_BTH addr2 =
      BuildBluetoothSockAddr(kBluetoothAddress2, kBluetoothPort);
  EXPECT_TRUE(bt_endpoint_other.FromSockAddr(
      reinterpret_cast<const struct sockaddr*>(&addr2), sizeof(addr2)));
  EXPECT_LT(bt_endpoint.address(), bt_endpoint_other.address());
  EXPECT_EQ(bt_endpoint.GetFamily(), bt_endpoint_other.GetFamily());
  EXPECT_EQ(bt_endpoint.GetSockAddrFamily(),
            bt_endpoint_other.GetSockAddrFamily());
  // Comparison functions should agree that `bt_endpoint < bt_endpoint_other`
  // due to lexicographic comparison of the address bytes.
  EXPECT_TRUE(bt_endpoint < bt_endpoint_other);
  EXPECT_TRUE(bt_endpoint != bt_endpoint_other);
  EXPECT_FALSE(bt_endpoint == bt_endpoint_other);
  // Test that IPv4/IPv6-only methods crash.
  EXPECT_DCHECK_DEATH(bt_endpoint_other.port());
  SockaddrStorage storage;
  EXPECT_DCHECK_DEATH(std::ignore = bt_endpoint_other.ToSockAddr(
                          storage.addr, &storage.addr_len));
  EXPECT_DCHECK_DEATH(bt_endpoint_other.ToString());
  EXPECT_DCHECK_DEATH(bt_endpoint_other.ToStringWithoutPort());
}
#endif

TEST_F(IPEndPointTest, Equality) {
  uint16_t port = 0;
  for (const auto& test : tests) {
    IPEndPoint src(test.ip_address, ++port);
    IPEndPoint dest(src);
    EXPECT_TRUE(src == dest);
  }
}

TEST_F(IPEndPointTest, LessThan) {
  // Vary by port.
  IPEndPoint ip_endpoint1(tests[0].ip_address, 100);
  IPEndPoint ip_endpoint2(tests[0].ip_address, 1000);
  EXPECT_TRUE(ip_endpoint1 < ip_endpoint2);
  EXPECT_FALSE(ip_endpoint2 < ip_endpoint1);

  // IPv4 vs IPv6
  ip_endpoint1 = IPEndPoint(tests[0].ip_address, 81);
  ip_endpoint2 = IPEndPoint(tests[2].ip_address, 80);
  EXPECT_TRUE(ip_endpoint1 < ip_endpoint2);
  EXPECT_FALSE(ip_endpoint2 < ip_endpoint1);

  // IPv4 vs IPv4
  ip_endpoint1 = IPEndPoint(tests[0].ip_address, 81);
  ip_endpoint2 = IPEndPoint(tests[1].ip_address, 80);
  EXPECT_TRUE(ip_endpoint1 < ip_endpoint2);
  EXPECT_FALSE(ip_endpoint2 < ip_endpoint1);

  // IPv6 vs IPv6
  ip_endpoint1 = IPEndPoint(tests[2].ip_address, 81);
  ip_endpoint2 = IPEndPoint(tests[3].ip_address, 80);
  EXPECT_TRUE(ip_endpoint1 < ip_endpoint2);
  EXPECT_FALSE(ip_endpoint2 < ip_endpoint1);

  // Compare equivalent endpoints.
  ip_endpoint1 = IPEndPoint(tests[0].ip_address, 80);
  ip_endpoint2 = IPEndPoint(tests[0].ip_address, 80);
  EXPECT_FALSE(ip_endpoint1 < ip_endpoint2);
  EXPECT_FALSE(ip_endpoint2 < ip_endpoint1);
}

TEST_F(IPEndPointTest, ToString) {
  {
    IPEndPoint endpoint;
    EXPECT_EQ(0, endpoint.port());
  }

  uint16_t port = 100;
  for (const auto& test : tests) {
    ++port;
    IPEndPoint endpoint(test.ip_address, port);
    const std::string result = endpoint.ToString();
    EXPECT_EQ(test.host_normalized + ":" + base::NumberToString(port), result);
  }

  // ToString() shouldn't crash on invalid addresses.
  IPAddress invalid_address;
  IPEndPoint invalid_endpoint(invalid_address, 8080);
  EXPECT_EQ("", invalid_endpoint.ToString());
  EXPECT_EQ("", invalid_endpoint.ToStringWithoutPort());
}

TEST_F(IPEndPointTest, RoundtripThroughValue) {
  for (const auto& test : tests) {
    IPEndPoint endpoint(test.ip_address, 1645);
    base::Value value = endpoint.ToValue();

    EXPECT_THAT(IPEndPoint::FromValue(value), Optional(endpoint));
  }
}

TEST_F(IPEndPointTest, FromGarbageValue) {
  base::Value value(123);
  EXPECT_FALSE(IPEndPoint::FromValue(value).has_value());
}

TEST_F(IPEndPointTest, FromMalformedValues) {
  for (const auto& test : tests) {
    base::Value valid_value = IPEndPoint(test.ip_address, 1111).ToValue();
    ASSERT_TRUE(IPEndPoint::FromValue(valid_value).has_value());

    base::Value missing_address = valid_value.Clone();
    ASSERT_TRUE(missing_address.GetDict().Remove("address"));
    EXPECT_FALSE(IPEndPoint::FromValue(missing_address).has_value());

    base::Value missing_port = valid_value.Clone();
    ASSERT_TRUE(missing_port.GetDict().Remove("port"));
    EXPECT_FALSE(IPEndPoint::FromValue(missing_port).has_value());

    base::Value invalid_address = valid_value.Clone();
    *invalid_address.GetDict().Find("address") = base::Value("1.2.3.4.5");
    EXPECT_FALSE(IPEndPoint::FromValue(invalid_address).has_value());

    base::Value negative_port = valid_value.Clone();
    *negative_port.GetDict().Find("port") = base::Value(-1);
    EXPECT_FALSE(IPEndPoint::FromValue(negative_port).has_value());

    base::Value large_port = valid_value.Clone();
    *large_port.GetDict().Find("port") = base::Value(66000);
    EXPECT_FALSE(IPEndPoint::FromValue(large_port).has_value());
  }
}

}  // namespace

}  // namespace net