dns.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NDN_UTIL_DNS_HPP
#define NDN_UTIL_DNS_HPP

#include "../util/time.hpp"

#include <boost/asio/ip/address.hpp>

// forward declaration
namespace boost {
namespace asio {
class io_service;
} // namespace asio
} // namespace boost

namespace ndn {
namespace dns {

typedef boost::asio::ip::address IpAddress;
typedef function<bool (const IpAddress& address)> AddressSelector;

struct AnyAddress
{
  bool
  operator()(const IpAddress& address) const
  {
    return true;
  }
};

struct Ipv4Only
{
  bool
  operator()(const IpAddress& address) const
  {
    return address.is_v4();
  }
};

struct Ipv6Only
{
  bool
  operator()(const IpAddress& address) const
  {
    return address.is_v6();
  }
};

struct Error : public std::runtime_error
{
  explicit
  Error(const std::string& what)
    : std::runtime_error(what)
  {
  }
};

typedef function<void (const IpAddress& address)> SuccessCallback;
typedef function<void (const std::string& reason)> ErrorCallback;

void
asyncResolve(const std::string& host,
             const SuccessCallback& onSuccess,
             const ErrorCallback& onError,
             boost::asio::io_service& ioService,
             const AddressSelector& addressSelector = AnyAddress(),
             time::nanoseconds timeout = time::seconds(4));

IpAddress
syncResolve(const std::string& host,
            boost::asio::io_service& ioService,
            const AddressSelector& addressSelector = AnyAddress());

} // namespace dns
} // namespace ndn

#endif // NDN_UTIL_DNS_HPP