C++ IPAddress::isV4方法代码示例

// public
bool operator==(const IPAddress& addr1, const IPAddress& addr2) {
  if (addr1.family() == addr2.family()) {
    if (addr1.isV6()) {
      return (addr1.asV6() == addr2.asV6());
    } else if (addr1.isV4()) {
      return (addr1.asV4() == addr2.asV4());
    } else {
      CHECK_EQ(addr1.family(), AF_UNSPEC);
      // Two default initialized AF_UNSPEC addresses should be considered equal.
      // AF_UNSPEC is the only other value for which an IPAddress can be
      // created, in the default constructor case.
      return true;
    }
  }
  // addr1 is v4 mapped v6 address, addr2 is v4
  if (addr1.isIPv4Mapped() && addr2.isV4()) {
    if (IPAddress::createIPv4(addr1) == addr2.asV4()) {
      return true;
    }
  }
  // addr2 is v4 mapped v6 address, addr1 is v4
  if (addr2.isIPv4Mapped() && addr1.isV4()) {
    if (IPAddress::createIPv4(addr2) == addr1.asV4()) {
      return true;
    }
  }
  // we only compare IPv4 and IPv6 addresses
  return false;
}

TEST(IPAddress, fromBinaryV4) {
  for (auto& tc : provideToLong) {
    SCOPED_TRACE(tc.first);
    union {
      uint8_t u8[4];
      uint32_t u32;
    } data;
    data.u32 = Endian::big(tc.second);
    ByteRange bytes(data.u8, 4);

    auto fromBin = IPAddressV4::fromBinary(bytes);
    IPAddressV4 fromStr(tc.first);
    EXPECT_EQ(fromStr, fromBin);

    IPAddressV4 addr2("0.0.0.0");
    addr2 = IPAddressV4::fromBinary(bytes);
    EXPECT_EQ(fromStr, addr2);

    IPAddress genericAddr = IPAddress::fromBinary(bytes);
    ASSERT_TRUE(genericAddr.isV4());
    EXPECT_EQ(fromStr, genericAddr.asV4());
    EXPECT_EQ(ByteRange(genericAddr.bytes(), genericAddr.byteCount()), bytes);
  }

  uint8_t data[20];
  EXPECT_THROW(IPAddressV4::fromBinary(ByteRange(data, 3)),
               IPAddressFormatException);
  EXPECT_THROW(IPAddressV4::fromBinary(ByteRange(data, 16)),
               IPAddressFormatException);
  EXPECT_THROW(IPAddressV4::fromBinary(ByteRange(data, 20)),
               IPAddressFormatException);
}

// tests code example
TEST(IPAddress, CodeExample) {
  EXPECT_EQ(4, sizeof(IPAddressV4));
  EXPECT_EQ(20, sizeof(IPAddressV6));
  EXPECT_EQ(24, sizeof(IPAddress));
  IPAddress uninitaddr;
  IPAddress v4addr("192.0.2.129");
  IPAddress v6map("::ffff:192.0.2.129");
  ASSERT_TRUE(uninitaddr.empty());
  ASSERT_FALSE(v4addr.empty());
  ASSERT_FALSE(v6map.empty());
  EXPECT_TRUE(v4addr.inSubnet("192.0.2.0/24"));
  EXPECT_TRUE(v4addr.inSubnet(IPAddress("192.0.2.0"), 24));
  EXPECT_TRUE(v4addr.inSubnet("192.0.2.128/30"));
  EXPECT_FALSE(v4addr.inSubnet("192.0.2.128/32"));
  EXPECT_EQ(2164392128, v4addr.asV4().toLong());
  EXPECT_EQ(3221226113, v4addr.asV4().toLongHBO());
  ASSERT_FALSE(uninitaddr.isV4());
  ASSERT_FALSE(uninitaddr.isV6());
  ASSERT_TRUE(v4addr.isV4());
  ASSERT_TRUE(v6map.isV6());
  EXPECT_TRUE(v4addr == v6map);
  ASSERT_TRUE(v6map.isIPv4Mapped());
  EXPECT_TRUE(v4addr.asV4() == IPAddress::createIPv4(v6map));
  EXPECT_TRUE(IPAddress::createIPv6(v4addr) == v6map.asV6());
}

// public static
IPAddressV4 IPAddress::createIPv4(const IPAddress& addr) {
  if (addr.isV4()) {
    return addr.asV4();
  } else {
    return addr.asV6().createIPv4();
  }
}

// expects the cachesMutex_ to be held
bool NeighborUpdater::flushEntryImpl(VlanID vlan, IPAddress ip) {
  if (ip.isV4()) {
    auto cache = getArpCacheInternal(vlan);
    return cache->flushEntryBlocking(ip.asV4());
  }
  auto cache = getNdpCacheInternal(vlan);
  return cache->flushEntryBlocking(ip.asV6());
}

/**
 * Change IP configuration settings disabling the dhcp client
 * @param local_ip   Static ip configuration
 * @param gateway    Static gateway configuration
 * @param subnet     Static Subnet mask
 * @param dns1       Static DNS server 1
 * @param dns2       Static DNS server 2
 */
bool ESP8266WiFiSTAClass::config(IPAddress local_ip, IPAddress arg1, IPAddress arg2, IPAddress arg3, IPAddress dns2) {

  if(!WiFi.enableSTA(true)) {
      return false;
  }

  //ESP argument order is: ip, gateway, subnet, dns1
  //Arduino arg order is:  ip, dns, gateway, subnet.

  //first, check whether dhcp should be used, which is when ip == 0 && gateway == 0 && subnet == 0.
  bool espOrderUseDHCP = (local_ip == 0U && arg1 == 0U && arg2 == 0U);
  bool arduinoOrderUseDHCP = (local_ip == 0U && arg2 == 0U && arg3 == 0U);
  if (espOrderUseDHCP || arduinoOrderUseDHCP) {
      _useStaticIp = false;
      wifi_station_dhcpc_start();
      return true;
  }

  //To allow compatibility, check first octet of 3rd arg. If 255, interpret as ESP order, otherwise Arduino order.
  IPAddress gateway = arg1;
  IPAddress subnet = arg2;
  IPAddress dns1 = arg3;

  if(subnet[0] != 255)
  {
    //octet is not 255 => interpret as Arduino order
    gateway = arg2;
    subnet = arg3[0] == 0 ? IPAddress(255,255,255,0) : arg3; //arg order is arduino and 4th arg not given => assign it arduino default
    dns1 = arg1;
  }

  // check whether all is IPv4 (or gateway not set)
  if (!(local_ip.isV4() && subnet.isV4() && (!gateway.isSet() || gateway.isV4()))) {
    return false;
  }

  //ip and gateway must be in the same subnet
  if((local_ip.v4() & subnet.v4()) != (gateway.v4() & subnet.v4())) {
    return false;
  }

  struct ip_info info;
  info.ip.addr = local_ip.v4();
  info.gw.addr = gateway.v4();
  info.netmask.addr = subnet.v4();

  wifi_station_dhcpc_stop();
  if(wifi_set_ip_info(STATION_IF, &info)) {
      _useStaticIp = true;
  } else {
      return false;
  }

  if(dns1.isSet()) {
      // Set DNS1-Server
      dns_setserver(0, dns1);
  }

  if(dns2.isSet()) {
      // Set DNS2-Server
      dns_setserver(1, dns2);
  }

  return true;
}