// SOCK_Dgram_Bcast.cpp
// $Id$


#define ACE_BUILD_DLL
#include "ace/SOCK_Dgram_Bcast.h"

#if defined (ACE_LACKS_INLINE_FUNCTIONS)
#include "ace/SOCK_Dgram_Bcast.i"
#endif

ACE_RCSID(ace, SOCK_Dgram_Bcast, "$Id$")

ACE_ALLOC_HOOK_DEFINE(ACE_SOCK_Dgram_Bcast)

ACE_Bcast_Node::ACE_Bcast_Node (ACE_INET_Addr &addr,
				ACE_Bcast_Node *next)
  : bcast_addr_ (addr), 
    next_ (next)
{
  ACE_TRACE ("ACE_Bcast_Node::ACE_Bcast_Node");
}

void
ACE_SOCK_Dgram_Bcast::dump (void) const
{
  ACE_TRACE ("ACE_SOCK_Dgram_Bcast::dump");
}

// Close up and release resources.

int
ACE_SOCK_Dgram_Bcast::close (void)
{
  ACE_TRACE ("ACE_SOCK_Dgram_Bcast::close");

  ACE_Bcast_Node *temp = this->if_list_;

  // Release the dynamically allocated memory.

  while (temp != 0)
    {
      ACE_Bcast_Node *hold = temp->next_;
      delete temp;
      temp = hold;
    }

  // Shut down the descriptor.
  return ACE_SOCK::close ();
}

// Here's the simple-minded constructor.

ACE_SOCK_Dgram_Bcast::ACE_SOCK_Dgram_Bcast (void)
  : if_list_ (0)
{
  ACE_TRACE ("ACE_SOCK_Dgram_Bcast::ACE_SOCK_Dgram_Bcast");
}

// Here's the general-purpose constructor used by a connectionless
// datagram ``server''...

ACE_SOCK_Dgram_Bcast::ACE_SOCK_Dgram_Bcast (const ACE_Addr &local, 
					    int protocol_family, 
					    int protocol,
					    int reuse_addr,
                                            const ASYS_TCHAR *host_name)
  : ACE_SOCK_Dgram (local, protocol_family, protocol, reuse_addr), 
    if_list_ (0)
{
  ACE_TRACE ("ACE_SOCK_Dgram_Bcast::ACE_SOCK_Dgram_Bcast");

  if (this->mk_broadcast (host_name) == -1)
    ACE_ERROR ((LM_ERROR,
                ASYS_TEXT ("%p\n"),
                ASYS_TEXT ("ACE_SOCK_Dgram_Bcast")));
}

// Here's the general-purpose open routine.

int
ACE_SOCK_Dgram_Bcast::open (const ACE_Addr &local, 
			    int protocol_family, 
			    int protocol,
			    int reuse_addr,
                            const ASYS_TCHAR *host_name)
{
  ACE_TRACE ("ACE_SOCK_Dgram_Bcast::open");

  if (this->ACE_SOCK_Dgram::open (local, protocol_family, 
				  protocol, reuse_addr) == -1)
    return -1;

  return this->mk_broadcast (host_name);
}

// Make broadcast available for Datagram socket.

int
ACE_SOCK_Dgram_Bcast::mk_broadcast (const ASYS_TCHAR *host_name)
{
  ACE_TRACE ("ACE_SOCK_Dgram_Bcast::mk_broadcast");

  int one = 1;

  if (ACE_OS::setsockopt (this->get_handle (),
                          SOL_SOCKET,
                          SO_BROADCAST, 
			  (char *) &one,
                          sizeof one) == -1)
    return -1;

#if !defined (ACE_WIN32)
  ACE_HANDLE s = this->get_handle ();

  char buf[BUFSIZ];
  struct ifconf ifc;

  ifc.ifc_len = sizeof buf;
  ifc.ifc_buf = buf;

  // Get interface structure and initialize the addresses using UNIX
  // techniques.
  if (ACE_OS::ioctl (s,
                     SIOCGIFCONF,
                     (char *) &ifc) == -1)
    ACE_ERROR_RETURN ((LM_ERROR, "%p\n", 
		      "ACE_SOCK_Dgram_Bcast::mk_broadcast: ioctl (get interface configuration)"),
		      ACE_INVALID_HANDLE);

  struct ifreq *ifr = ifc.ifc_req;

  struct sockaddr_in host_addr;

  //Get host ip address
  if (host_name)
    {
      hostent *hp = ACE_OS::gethostbyname (ASYS_MULTIBYTE_STRING (host_name));

      if (hp == 0)
	return -1;
      else
	ACE_OS::memcpy ((char *) &host_addr.sin_addr.s_addr, 
			(char *) hp->h_addr, 
			hp->h_length);
    }

  for (int n = ifc.ifc_len / sizeof (struct ifreq) ; n > 0; n--, ifr++) 
    {
      // Compare host ip address with interface ip address.
      if (host_name)
        {
	  struct sockaddr_in if_addr;

          ACE_OS::memcpy (&if_addr,
                          &ifr->ifr_addr,
                          sizeof if_addr);

          if (host_addr.sin_addr.s_addr != if_addr.sin_addr.s_addr)
	    continue;
        }

      if (ifr->ifr_addr.sa_family != AF_INET) 
	{
	  ACE_ERROR ((LM_ERROR, "%p\n", 
		      "ACE_SOCK_Dgram_Bcast::mk_broadcast: Not AF_INET"));
	  continue;
	}

      struct ifreq flags = *ifr;
      struct ifreq if_req = *ifr;

      if (ACE_OS::ioctl (s,
                         SIOCGIFFLAGS,
                         (char *) &flags) == -1)
	{
	  ACE_ERROR ((LM_ERROR, "%p\n", 
		     "ACE_SOCK_Dgram_Bcast::mk_broadcast: ioctl (get interface flags)"));
	  continue;
	}   

      if (ACE_BIT_ENABLED (flags.ifr_flags,
                           IFF_UP) == 0)
	{
	  ACE_ERROR ((LM_ERROR, "%p\n", 
		     "ACE_SOCK_Dgram_Bcast::mk_broadcast: Network interface is not up"));
	  continue;
	}

      if (ACE_BIT_ENABLED (flags.ifr_flags,
                           IFF_LOOPBACK))
	continue;

      if (ACE_BIT_ENABLED (flags.ifr_flags,
                           IFF_BROADCAST))
	{
	  if (ACE_OS::ioctl (s,
                             SIOCGIFBRDADDR,
                             (char *) &if_req) == -1)
	    ACE_ERROR ((LM_ERROR, "%p\n", 
		       "ACE_SOCK_Dgram_Bcast::mk_broadcast: ioctl (get broadaddr)"));
	  else 
	    {
	      ACE_INET_Addr addr (ACE_reinterpret_cast (sockaddr_in *,
                                                        &if_req.ifr_broadaddr),
                                  sizeof if_req.ifr_broadaddr);
	      ACE_NEW_RETURN (this->if_list_,
                              ACE_Bcast_Node (addr,
                                              this->if_list_),
                              -1);
	    }
	}
      else 
	ACE_ERROR ((LM_ERROR, "%p\n", 
		   "ACE_SOCK_Dgram_Bcast::mk_broadcast: Broadcast is not enable for this interface."));
    }
#else
  ACE_UNUSED_ARG (host_name);

  ACE_INET_Addr addr (u_short (0),
                      ACE_UINT32 (INADDR_BROADCAST));
  ACE_NEW_RETURN (this->if_list_,
                  ACE_Bcast_Node (addr,
                                  this->if_list_),
                  -1);
#endif /* !ACE_WIN32 */
  return this->if_list_ == 0 ? -1 : 0;
}

// Broadcast the datagram to every interface.  Returns the average
// number of bytes sent.

ssize_t
ACE_SOCK_Dgram_Bcast::send (const void *buf, 
			    size_t n,
			    u_short port_number, 
			    int flags) const
{
  ACE_TRACE ("ACE_SOCK_Dgram_Bcast::send");
  size_t iterations = 0;
  ssize_t total_bytes = 0;

  if (this->if_list_ == 0) 
    return -1;

  for (ACE_Bcast_Node *temp = this->if_list_;
       temp != 0;
       temp = temp->next_)
    {
      temp->bcast_addr_.set_port_number (port_number);

      ssize_t bytes_sent = ACE_SOCK_Dgram::send (buf, 
                                                 n, 
						 temp->bcast_addr_, 
						 flags);

      if (bytes_sent == -1)
	return -1;
      else 
	total_bytes += bytes_sent;
	
      iterations++;
    }

  return iterations == 0 ? 0 : total_bytes / iterations;
}

#if defined (ACE_HAS_MSG)
// Broadcast datagram to every interfaces.

ssize_t
ACE_SOCK_Dgram_Bcast::send (const iovec iov[], 
			    size_t n, 
			    u_short /* port_number */,
			    int flags) const
{
  ACE_TRACE ("ACE_SOCK_Dgram_Bcast::send");

  if (this->if_list_ == 0)
    return -1;
  
  // Send the message to every interface.

  for (ACE_Bcast_Node *temp = this->if_list_;
       temp != 0;
       temp++) 
    if (ACE_SOCK_Dgram::send (iov,
                              n,
                              temp->bcast_addr_,
                              flags) == -1)
      return -1;

  return 0;
}

// Broadcast an iovec of size N to ADDR as a datagram (note that addr
// must be preassigned to the broadcast address of the subnet...).

ssize_t
ACE_SOCK_Dgram_Bcast::send (const iovec iov[], 
			    size_t n, 
			    const ACE_Addr &addr, 
			    int flags) const
{
  ACE_TRACE ("ACE_SOCK_Dgram_Bcast::send");

  return ACE_SOCK_Dgram::send (iov, n, addr, flags);
}
#endif /* ACE_HAS_MSG */