// $Id: IOR_Multicast.cpp 91682 2010-09-09 07:20:23Z johnnyw $

#include "orbsvcs/IOR_Multicast.h"

#include "tao/debug.h"

#include "ace/SOCK_Connector.h"
#include "ace/Log_Msg.h"

TAO_BEGIN_VERSIONED_NAMESPACE_DECL

ACE_HANDLE
TAO_IOR_Multicast::get_handle (void) const
{
  return this->mcast_dgram_.get_handle ();
}

TAO_IOR_Multicast::TAO_IOR_Multicast (void)
  : service_id_ ((TAO_Service_ID) 0)
{
}

TAO_IOR_Multicast::TAO_IOR_Multicast (const char *ior,
                                      u_short port,
                                      const char *mcast_addr,
                                      TAO_Service_ID service_id)
{
  if (this->init (ior,
                  port,
                  mcast_addr,
                  service_id) == -1)
    ACE_ERROR ((LM_ERROR,
                ACE_TEXT ("%p\n"),
                ACE_TEXT ("TAO_IOR_Multicast")));
}

TAO_IOR_Multicast::~TAO_IOR_Multicast (void)
{
  if (ior_.length() > 0 && this->mcast_dgram_.leave (this->mcast_addr_) == -1)
    {
    ACE_ERROR ((LM_ERROR, "%p\n", "~TAO_IOR_Multicast()"));
    }
}

int
TAO_IOR_Multicast::init (const char *ior,
                         u_short port,
                         const char *mcast_addr,
                         TAO_Service_ID service_id)
{
  if (this->mcast_addr_.set (port, mcast_addr) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "TAO_IOR_Multicast::init() %p\n", "set"), -1);
  return common_init (ior, service_id);
}

int
TAO_IOR_Multicast::init (const char *ior,
                         const char *mcast_addr,
                         TAO_Service_ID service_id)
{
  // Look for a '@' incase a nic is specified.
  const char* tmpnic = ACE_OS::strchr (mcast_addr, '@');

  CORBA::String_var actual_mcast_addr;
  CORBA::ULong length_addr;

  if (tmpnic != 0)
    {
      // i.e. a nic name has been specified
      length_addr = tmpnic - mcast_addr + 1;
      actual_mcast_addr = CORBA::string_alloc (length_addr);

      ACE_OS::strncpy (actual_mcast_addr.inout (),
                       mcast_addr,
                       length_addr - 1);

      actual_mcast_addr[length_addr - 1] = '\0';

      /// Save for use later.
      this->mcast_nic_ = tmpnic + 1;
    }
  else
    {
      actual_mcast_addr =
        CORBA::string_alloc (static_cast<CORBA::ULong> (ACE_OS::strlen (mcast_addr)));

      actual_mcast_addr = mcast_addr;
    }

  if (this->mcast_addr_.set (actual_mcast_addr.in ()) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "%p\n",
                       "set"),
                      -1);

  return common_init (ior, service_id);
}

int
TAO_IOR_Multicast::common_init (const char *ior,
                                TAO_Service_ID service_id)
{
  this->service_id_ = service_id;
  this->ior_ = ior;

  if (this->response_addr_.set ((u_short) 0) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
    "TAO_IOR_Multicast::common_init() %p\n",
                       "set"),
                      -1);
  else if (this->response_.open (this->response_addr_) == -1)
    {
      ACE_ERROR_RETURN ((LM_ERROR,
                         "%p\n",
                         "set"),
                        -1);
    }

  // Use ACE_SOCK_Dgram_Mcast factory to subscribe to multicast group.
  if (this->mcast_nic_.length() != 0)
    {
      if (this->mcast_dgram_.join (this->mcast_addr_,
                                   1,
                                   ACE_TEXT_CHAR_TO_TCHAR(this->mcast_nic_.c_str())) == -1)
      ACE_ERROR_RETURN ((LM_ERROR, "TAO_IOR_Multicast::common_init() %p\n", "join"),-1);
    }
  else
    {
      if (this->mcast_dgram_.join (this->mcast_addr_) == -1)
        ACE_ERROR_RETURN ((LM_ERROR,
      "TAO_IOR_Multicast::common_init() %p\n",
                           "subscribe"),
                          -1);
    }
  return 0;
}

int
TAO_IOR_Multicast::handle_timeout (const ACE_Time_Value &,
                                   const void *)
{
  return 0;
}

int
TAO_IOR_Multicast::handle_input (ACE_HANDLE)
{
  if (TAO_debug_level > 0)
    ACE_DEBUG ((LM_DEBUG, "Entered TAO_IOR_Multicast::handle_input\n"));

  // The length of the service name string that follows.
  CORBA::Short header;
  // Port to which to reply.
  ACE_UINT16 remote_port;
  // Name of the service for which the client is looking.
  char service_name[BUFSIZ];

  ACE_INET_Addr remote_addr;

  // Take a peek at the header to find out how long is the service
  // name string we should receive.
  ssize_t n = this->mcast_dgram_.recv (&header,
                                       sizeof (header),
                                       remote_addr,
                                       MSG_PEEK);
  if (n <= 0)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "TAO_IOR_Multicast::handle_input - peek %d\n",
                       n),
                      0);
  else if (ACE_NTOHS (header) <= 0)
    ACE_ERROR_RETURN ((LM_ERROR,
    "TAO_IOR_Multicast::handle_input() Header value < 1\n"),
                      0);

  // Receive full client multicast request.
  const int iovcnt = 3;
  iovec iov[iovcnt];

  iov[0].iov_base = (char *) &header;
  iov[0].iov_len  = sizeof (header);
  iov[1].iov_base = (char *) &remote_port;
  iov[1].iov_len  = sizeof (ACE_UINT16);
  iov[2].iov_base = (char *) service_name;
  iov[2].iov_len  = ACE_NTOHS (header);

  // Read the iovec.
  n = this->mcast_dgram_.recv (iov,
                               iovcnt,
                               remote_addr);
  if (n <= 0)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "TAO_IOR_Multicast::handle_input recv = %d\n",
                       n),
                      0);

  if (TAO_debug_level > 0)
    {
      ACE_TCHAR addr[64];
      remote_addr.addr_to_string (addr, sizeof(addr));
      ACE_DEBUG ((LM_DEBUG,
                  "(%P|%t) Received multicast from %s.\n"
                  "Service Name received : %s\n"
                  "Port received : %u\n",
                  addr,
                  service_name,
                  ACE_NTOHS (remote_port)));
    }

  if (ACE_OS::strcmp (service_name,
                      "NameService") != 0
      && ACE_OS::strcmp (service_name,
                         "TradingService") != 0
      && ACE_OS::strcmp (service_name,
                         "ImplRepoService") != 0
      && ACE_OS::strcmp (service_name,
                         "InterfaceRepository") != 0
      && ACE_OS::strcmp (service_name,
                         "MCASTServer") != 0)
    {
      ACE_ERROR_RETURN ((LM_ERROR,
        "IOR_Multicast::connect() Unknown service requested.\n"),0);
    }

  // Reply to the multicast message.
  ACE_SOCK_Connector connector;
  ACE_INET_Addr peer_addr;
  ACE_SOCK_Stream stream;

  peer_addr.set (remote_addr);
  peer_addr.set_port_number (ACE_NTOHS (remote_port));

#if defined (ACE_HAS_IPV6)
  if (peer_addr.is_linklocal ())
    {
      // If this is one of our local linklocal interfaces this is not going
      // to work.
      // Creating a connection using such interface to the client listening
      // at the IPv6 ANY address is not going to work (I'm not quite sure why
      // but it probably has to do with the rather restrictive routing rules
      // for linklocal interfaces).
      // So we see if this is one of our local interfaces and if so create the
      // connection using the IPv6 loopback address instead.
      ACE_INET_Addr  peer_tmp(peer_addr);
      peer_tmp.set_port_number (static_cast<u_short> (0));
      ACE_INET_Addr* tmp = 0;
      size_t cnt = 0;
      int err = ACE::get_ip_interfaces (cnt, tmp);
      if (err == 0)
        {
          for (size_t i = 0; i < cnt; ++i)
          {
            if (peer_tmp == tmp[i])
              {
                peer_addr.set (ACE_NTOHS (remote_port),
                               ACE_IPV6_LOCALHOST);
                break;
              }
          }

          delete[] tmp;
        }
    }
#endif /* ACE_HAS_IPV6 */

  if (TAO_debug_level > 0)
    {
      ACE_TCHAR addr[64];
      peer_addr.addr_to_string (addr, sizeof(addr));
      ACE_DEBUG ((LM_DEBUG,
                  "(%P|%t) Replying to peer %s.\n",
                  addr));
    }

  // Connect.
  if (connector.connect (stream, peer_addr) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "IOR_Multicast::connect failed\n"), 0);
  // Send the IOR back to the client.  (Send iovec, which contains ior
  // length as the first element, and ior itself as the second.)

  // Length of ior to be sent.
  CORBA::Short data_len =
    static_cast<CORBA::Short> (ACE_HTONS (this->ior_.length () + 1));

  // Vector to be sent.
  const int cnt = 2;
  iovec iovp[cnt];

  // The length of ior to be sent.
  iovp[0].iov_base = (char *) &data_len;
  iovp[0].iov_len  = sizeof (CORBA::Short);

  // The ior.
  iovp[1].iov_base = const_cast<char*> (this->ior_.c_str ());
  iovp[1].iov_len  = static_cast<u_long> (this->ior_.length () + 1);

  ssize_t result = stream.sendv_n (iovp, cnt);
  // Close the stream.
  stream.close ();

  // Check for error.
  if (result == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "IOR_Multicast::send failed\n"), 0);

  if (TAO_debug_level > 0)
    ACE_DEBUG ((LM_DEBUG,
    "(%P|%t) TAO_IOR_Multicast::handle_input() ior_: <%s>\n"
                "sent to %s:%u.\n"
                "result from send = %d\n",
                this->ior_.c_str (),
                peer_addr.get_host_name (),
                peer_addr.get_port_number (),
                result));
  return 0;
}

TAO_END_VERSIONED_NAMESPACE_DECL
