path: root/netsvcs/lib/Name_Handler.cpp

#define ACE_BUILD_SVC_DLL

#include "ace/Containers.h"
#include "ace/Get_Opt.h"
#include "ace/Singleton.h"
#include "ace/Auto_Ptr.h"
#include "Name_Handler.h"
#include "ace/Signal.h"
#include "ace/OS_NS_string.h"

ACE_RCSID(lib,
          Name_Handler,
          "$Id$")

#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_Singleton<Naming_Context, ACE_SYNCH_NULL_MUTEX>;
template class ACE_Accept_Strategy<ACE_Name_Handler, ACE_SOCK_ACCEPTOR>;
template class ACE_Acceptor<ACE_Name_Handler, ACE_SOCK_ACCEPTOR>;
template class ACE_Concurrency_Strategy<ACE_Name_Handler>;
template class ACE_Creation_Strategy<ACE_Name_Handler>;
template class ACE_Schedule_All_Reactive_Strategy<ACE_Name_Handler>;
template class ACE_Scheduling_Strategy<ACE_Name_Handler>;
template class ACE_Strategy_Acceptor<ACE_Name_Handler, ACE_SOCK_ACCEPTOR>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#pragma instantiate ACE_Singleton<Naming_Context, ACE_SYNCH_NULL_MUTEX>
#pragma instantiate ACE_Accept_Strategy<ACE_Name_Handler, ACE_SOCK_ACCEPTOR>
#pragma instantiate ACE_Acceptor<ACE_Name_Handler, ACE_SOCK_ACCEPTOR>
#pragma instantiate ACE_Concurrency_Strategy<ACE_Name_Handler>
#pragma instantiate ACE_Creation_Strategy<ACE_Name_Handler>
#pragma instantiate ACE_Schedule_All_Reactive_Strategy<ACE_Name_Handler>
#pragma instantiate ACE_Scheduling_Strategy<ACE_Name_Handler>
#pragma instantiate ACE_Strategy_Acceptor<ACE_Name_Handler, ACE_SOCK_ACCEPTOR>
#elif defined (ACE_HAS_EXPLICIT_STATIC_TEMPLATE_MEMBER_INSTANTIATION)
template ACE_Singleton<Naming_Context, ACE_SYNCH_NULL_MUTEX> *
      ACE_Singleton<Naming_Context, ACE_SYNCH_NULL_MUTEX>::singleton_;
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */

// Simple macro that does bitwise AND -- useful in table lookup
#define ACE_TABLE_MAP(INDEX, MASK) (INDEX & MASK)

// Simple macro that does bitwise AND and then right shift bits by 3
#define ACE_LIST_MAP(INDEX, MASK) (((unsigned long) (INDEX & MASK)) >> 3)

int
ACE_Name_Acceptor::parse_args (int argc, char *argv[])
{
  ACE_TRACE ("ACE_Name_Acceptor::parse_args");

  int service_port = ACE_DEFAULT_SERVER_PORT;

  ACE_LOG_MSG->open ("Name Service");

  ACE_Get_Opt get_opt (argc, argv, "p:", 0);

  for (int c; (c = get_opt ()) != -1; )
    {
      switch (c)
        {
        case 'p':
          service_port = ACE_OS::atoi (get_opt.opt_arg ());
          break;
        default:
          ACE_ERROR_RETURN ((LM_ERROR,
                            "%n:\n[-p server-port]\n%a", 1),
                           -1);
        }
    }

  this->service_addr_.set (service_port);
  return 0;
}

int
ACE_Name_Acceptor::init (int argc, char *argv[])
{
  ACE_TRACE ("ACE_Name_Acceptor::init");

  // Use the options hook to parse the command line arguments and set
  // options.
  this->parse_args (argc, argv);

  // Set the acceptor endpoint into listen mode (use the Singleton
  // global Reactor...).
  if (this->open (this->service_addr_,
                  ACE_Reactor::instance (),
                  0, 0, 0,
                  &this->scheduling_strategy_,
                  "Name Server",
                  "ACE naming service") == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "%n: %p on port %d\n",
                       "acceptor::open failed",
                       this->service_addr_.get_port_number ()),
                      -1);

  // Ignore SIGPIPE so that each <SVC_HANDLER> can handle this on its
  // own.
  ACE_Sig_Action sig ((ACE_SignalHandler) SIG_IGN, SIGPIPE);
  ACE_UNUSED_ARG (sig);

  ACE_INET_Addr server_addr;

  // Figure out what port we're really bound to.
  if (this->acceptor ().get_local_addr (server_addr) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "%p\n",
                       "get_local_addr"),
                      -1);

  ACE_DEBUG ((LM_DEBUG,
              "starting up Name Server at port %d on handle %d\n",
             server_addr.get_port_number (),
             this->acceptor ().get_handle ()));
  return 0;
}

// The following is a "Factory" used by the ACE_Service_Config and
// svc.conf file to dynamically initialize the state of the Naming
// Server.

ACE_SVC_FACTORY_DEFINE (ACE_Name_Acceptor)

// Default constructor.
ACE_Name_Handler::ACE_Name_Handler (ACE_Thread_Manager *tm)
  : ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH> (tm)
{
  ACE_TRACE ("ACE_Name_Handler::ACE_Name_Handler");

  // Set up pointers to member functions for the top-level dispatching
  // of client requests.
  this->op_table_[ACE_Name_Request::BIND] = &ACE_Name_Handler::bind;
  this->op_table_[ACE_Name_Request::REBIND] = &ACE_Name_Handler::rebind;
  this->op_table_[ACE_Name_Request::RESOLVE] = &ACE_Name_Handler::resolve;
  this->op_table_[ACE_Name_Request::UNBIND] = &ACE_Name_Handler::unbind;
  this->op_table_[ACE_Name_Request::LIST_NAMES] = &ACE_Name_Handler::lists;
  this->op_table_[ACE_Name_Request::LIST_NAME_ENTRIES] = &ACE_Name_Handler::lists_entries;

  // Assign references to simplify subsequent code.
  LIST_ENTRY &list_names_ref = this->list_table_[ACE_LIST_MAP (ACE_Name_Request::LIST_NAMES,
                                                               ACE_Name_Request::LIST_OP_MASK)];
  LIST_ENTRY &list_values_ref = this->list_table_[ACE_LIST_MAP (ACE_Name_Request::LIST_VALUES,
                                                                ACE_Name_Request::LIST_OP_MASK)];
  LIST_ENTRY &list_types_ref = this->list_table_[ACE_LIST_MAP (ACE_Name_Request::LIST_TYPES,
                                                               ACE_Name_Request::LIST_OP_MASK)];

  // Set up pointers to member functions for dispatching within the
  // LIST_{NAMES,VALUES,TYPES} methods.

  list_names_ref.operation_ = &ACE_Naming_Context::list_names;
  list_names_ref.request_factory_ = &ACE_Name_Handler::name_request;
  list_names_ref.description_ = "request for LIST_NAMES\n";

  list_values_ref.operation_ = &ACE_Naming_Context::list_values;
  list_values_ref.request_factory_ = &ACE_Name_Handler::value_request;
  list_values_ref.description_ = "request for LIST_VALUES\n";

  list_types_ref.operation_ = &ACE_Naming_Context::list_types;
  list_types_ref.request_factory_ = &ACE_Name_Handler::type_request;
  list_types_ref.description_ = "request for LIST_TYPES\n";
}

// Activate this instance of the ACE_Name_Handler (called by the
// ACE_Name_Acceptor).

/* VIRTUAL */ int
ACE_Name_Handler::open (void *)
{
  ACE_TRACE ("ACE_Name_Handler::open");

  // Call down to our parent to register ourselves with the Reactor.
  if (ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH>::open (0) == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "%p\n",
                       "open"),
                      -1);
  return 0;
}

// Create and send a reply to the client.

/* VIRTUAL */ int
ACE_Name_Handler::send_reply (ACE_INT32 status,
                              ACE_UINT32 err)
{
  ACE_TRACE ("ACE_Name_Handler::send_reply");
  void *buf;
  this->name_reply_.msg_type (status);
  this->name_reply_.errnum (err);

  this->name_reply_.init ();
  int len = this->name_reply_.encode (buf);

  if (len == -1)
    return -1;

  ssize_t n = this->peer ().send (buf, len);

  if (n != len)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "%p\n, expected len = %d, actual len = %d",
                      "send failed",
                       len,
                       n),
                      -1);
  else
    return 0;
}

/* VIRTUAL */ int
ACE_Name_Handler::send_request (ACE_Name_Request &request)
{
  ACE_TRACE ("ACE_Name_Handler::send_request");
  void *buffer;
  ssize_t length = request.encode (buffer);

  if (length == -1)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "%p\n",
                       "encode failed"),
                      -1);
  // Transmit request via a blocking send.

  if (this->peer ().send_n (buffer, length) != length)
    ACE_ERROR_RETURN ((LM_ERROR,
                       "%p\n",
                       "send_n failed"),
                      -1);
  return 0;
}

// Give up waiting (e.g., when a timeout occurs or a client shuts down
// unexpectedly).

/* VIRTUAL */ int
ACE_Name_Handler::abandon (void)
{
  ACE_TRACE ("ACE_Name_Handler::abandon");
  return this->send_reply (-1, errno);
}

// Enable clients to limit the amount of time they'll wait

/* VIRTUAL */ int
ACE_Name_Handler::handle_timeout (const ACE_Time_Value &, const void *)
{
  ACE_TRACE ("ACE_Name_Handler::handle_timeout");
  return this->abandon ();
}

// Return the underlying ACE_HANDLE.

/* VIRTUAL */ ACE_HANDLE
ACE_Name_Handler::get_handle (void) const
{
  ACE_TRACE ("ACE_Name_Handler::get_handle");
  return this->peer ().get_handle ();
}

// Dispatch the appropriate operation to handle the client request.

/* VIRTUAL */ int
ACE_Name_Handler::dispatch (void)
{
  ACE_TRACE ("ACE_Name_Handler::dispatch");
  // Dispatch the appropriate request.
  int index = this->name_request_.msg_type ();

  // Invoke the appropriate member function obtained by indexing into
  // the op_table_. ACE_TABLE_MAP returns the same index (by bitwise
  // AND) for list_names, list_values, and list_types since they are
  // all handled by the same method. Similarly, it returns the same
  // index for list_name_entries, list_value_entries, and
  // list_type_entries.
  return (this->*op_table_[ACE_TABLE_MAP (index,
                                          ACE_Name_Request::OP_TABLE_MASK)]) ();
}

// Receive, frame, and decode the client's request.  Note, this method
// should use non-blocking I/O.

/* VIRTUAL */ int
ACE_Name_Handler::recv_request (void)
{
  ACE_TRACE ("ACE_Name_Handler::recv_request");
  // Read the first 4 bytes to get the length of the message This
  // implementation assumes that the first 4 bytes are the length of
  // the message.
  ssize_t n = this->peer ().recv ((void *) &this->name_request_,
                                  sizeof (ACE_UINT32));
  switch (n)
    {
    case -1:
      /* FALLTHROUGH */
      ACE_DEBUG ((LM_DEBUG,
                  "****************** recv_request returned -1\n"));
    default:
      ACE_ERROR ((LM_ERROR,
                  "%p got %d bytes, expected %d bytes\n",
                 "recv failed",
                  n,
                  sizeof (ACE_UINT32)));
      /* FALLTHROUGH */
    case 0:
      // We've shutdown unexpectedly, let's abandon the connection.
      this->abandon ();
      return -1;
      /* NOTREACHED */
    case sizeof (ACE_UINT32):
      {
        // Transform the length into host byte order.
        ssize_t length = ntohl (this->name_request_.length ());

        // Do a sanity check on the length of the message.
        if (length > (ssize_t) sizeof this->name_request_)
          {
            ACE_ERROR ((LM_ERROR,
                        "length %d too long\n",
                        length));
            return this->abandon ();
          }

        // Receive the rest of the request message.
        // @@ beware of blocking read!!!.
        n = this->peer ().recv ((void *) (((char *) &this->name_request_)
                                        + sizeof (ACE_UINT32)),
                                length - sizeof (ACE_UINT32));

        // Subtract off the size of the part we skipped over...
        if (n != (length - (ssize_t) sizeof (ACE_UINT32)))
          {
            ACE_ERROR ((LM_ERROR, "%p expected %d, got %d\n",
                       "invalid length", length, n));
            return this->abandon ();
          }

        // Decode the request into host byte order.
        if (this->name_request_.decode () == -1)
          {
            ACE_ERROR ((LM_ERROR,
                        "%p\n",
                        "decode failed"));
            return this->abandon ();
          }
      }
    }
  return 0;
}

// Callback method invoked by the ACE_Reactor when events arrive from
// the client.

/* VIRTUAL */ int
ACE_Name_Handler::handle_input (ACE_HANDLE)
{
  ACE_TRACE ("ACE_Name_Handler::handle_input");

  if (this->recv_request () == -1)
    return -1;
  else
    return this->dispatch ();
}

int
ACE_Name_Handler::bind (void)
{
  ACE_TRACE ("ACE_Name_Handler::bind");
  return this->shared_bind (0);
}

int
ACE_Name_Handler::rebind (void)
{
  ACE_TRACE ("ACE_Name_Handler::rebind");
  int result = this->shared_bind (1);
  return result == 1 ? 0 : result;
}

int
ACE_Name_Handler::shared_bind (int rebind)
{
  ACE_TRACE ("ACE_Name_Handler::shared_bind");
  ACE_NS_WString a_name (this->name_request_.name (),
                         this->name_request_.name_len () / sizeof (ACE_WCHAR_T));
  ACE_NS_WString a_value (this->name_request_.value (),
                          this->name_request_.value_len () / sizeof (ACE_WCHAR_T));
  int result;
  if (rebind == 0)
    {
#if 0
      ACE_DEBUG ((LM_DEBUG,
                  "request for BIND \n"));
#endif /* 0 */
      result = NAMING_CONTEXT::instance ()->bind (a_name,
                                                  a_value,
                                                  this->name_request_.type ());
    }
  else
    {
#if 0
      ACE_DEBUG ((LM_DEBUG,
                  "request for REBIND \n"));
#endif /* 0 */
      result = NAMING_CONTEXT::instance ()->rebind (a_name,
                                                    a_value,
                                                    this->name_request_.type ());
      if (result == 1)
        result = 0;
    }
  if (result == 0)
    return this->send_reply (0);
  else
    return this->send_reply (-1);
}

int
ACE_Name_Handler::resolve (void)
{
  ACE_TRACE ("ACE_Name_Handler::resolve");
#if 0
  ACE_DEBUG ((LM_DEBUG, "request for RESOLVE \n"));
#endif /* 0 */
  ACE_NS_WString a_name (this->name_request_.name (),
                         this->name_request_.name_len () / sizeof (ACE_WCHAR_T));

  // The following will deliver our reply back to client we
  // pre-suppose success (indicated by type RESOLVE).

  ACE_NS_WString avalue;
  char *atype;
  if (NAMING_CONTEXT::instance ()->resolve (a_name, avalue, atype) == 0)
    {
      ACE_Auto_Basic_Array_Ptr<ACE_WCHAR_T> avalue_urep (avalue.rep ());
      ACE_Name_Request nrq (ACE_Name_Request::RESOLVE,
                            0,
                            0,
                            avalue_urep.get (),
                            avalue.length () * sizeof (ACE_WCHAR_T),
                            atype, ACE_OS::strlen (atype));
      delete[] atype;
      return this->send_request (nrq);
    }

  ACE_Name_Request nrq (ACE_Name_Request::BIND, 0, 0, 0, 0, 0, 0);
  this->send_request (nrq);
  return 0;
}

int
ACE_Name_Handler::unbind (void)
{
  ACE_TRACE ("ACE_Name_Handler::unbind");
#if 0
  ACE_DEBUG ((LM_DEBUG, "request for UNBIND \n"));
#endif /* 0 */
  ACE_NS_WString a_name (this->name_request_.name (),
                         this->name_request_.name_len () / sizeof (ACE_WCHAR_T));

  if (NAMING_CONTEXT::instance ()->unbind (a_name) == 0)
    return this->send_reply (0);
  else
    return this->send_reply (-1);
}

ACE_Name_Request
ACE_Name_Handler::name_request (ACE_NS_WString *one_name)
{
  ACE_TRACE ("ACE_Name_Handler::name_request");
  ACE_Auto_Basic_Array_Ptr<ACE_WCHAR_T> one_name_urep (one_name->rep ());
  return ACE_Name_Request (ACE_Name_Request::LIST_NAMES,
                           one_name_urep.get (),
                           one_name->length () * sizeof (ACE_WCHAR_T),
                           0, 0,
                           0, 0);
}

ACE_Name_Request
ACE_Name_Handler::value_request (ACE_NS_WString *one_value)
{
  ACE_TRACE ("ACE_Name_Handler::value_request");
  ACE_Auto_Basic_Array_Ptr<ACE_WCHAR_T> one_value_urep (one_value->rep ());
  return ACE_Name_Request (ACE_Name_Request::LIST_VALUES,
                           0, 0,
                           one_value_urep.get (),
                           one_value->length () * sizeof (ACE_WCHAR_T),
                           0, 0);
}

ACE_Name_Request
ACE_Name_Handler::type_request (ACE_NS_WString *one_type)
{
  ACE_TRACE ("ACE_Name_Handler::type_request");
  return ACE_Name_Request (ACE_Name_Request::LIST_TYPES,
                           0, 0,
                           0, 0,
                           ACE_Auto_Basic_Array_Ptr<char> (one_type->char_rep ()).get (),
                           one_type->length ());
}

int
ACE_Name_Handler::lists (void)
{
  ACE_TRACE ("ACE_Name_Handler::lists");

  ACE_PWSTRING_SET set;
  ACE_NS_WString pattern (this->name_request_.name (),
                          this->name_request_.name_len () / sizeof (ACE_WCHAR_T));

  // Get the index into the list table
  int index = ACE_LIST_MAP (this->name_request_.msg_type (),
                            ACE_Name_Request::LIST_OP_MASK);

  // Print the message type
  ACE_DEBUG ((LM_DEBUG, list_table_[index].description_));

  // Call the appropriate method
  if ((NAMING_CONTEXT::instance ()->*list_table_[index].operation_) (set, pattern) != 0)
    {
      // None found so send blank request back
      ACE_Name_Request end_rq (ACE_Name_Request::MAX_ENUM, 0, 0, 0, 0, 0, 0);

      if (this->send_request (end_rq) == -1)
        return -1;
    }
  else
    {
      ACE_NS_WString *one_entry = 0;

      for (ACE_Unbounded_Set_Iterator<ACE_NS_WString> set_iterator (set);
           set_iterator.next (one_entry) !=0;
           set_iterator.advance())
        {
          ACE_Name_Request nrq ((this->*list_table_[index].request_factory_) (one_entry));

          // Create a request by calling the appropriate method obtained
          // by accessing into the table. Then send the request across.
          if (this->send_request (nrq) == -1)
            return -1;
        }

      // Send last message indicator.
      ACE_Name_Request nrq (ACE_Name_Request::MAX_ENUM,
                            0, 0,
                            0, 0,
                            0, 0);
      return this->send_request (nrq);
    }
  return 0;
}

int
ACE_Name_Handler::lists_entries (void)
{
  ACE_TRACE ("ACE_Name_Handler::lists_entries");
  ACE_BINDING_SET set;
  ACE_NS_WString pattern (this->name_request_.name (),
                          this->name_request_.name_len () / sizeof (ACE_WCHAR_T));

  int result = -1;

  const ACE_Name_Request::Constants msg_type =
    ACE_static_cast (ACE_Name_Request::Constants,
                     this->name_request_.msg_type ());

  // NOTE:  This multi-branch conditional statement used to be
  // (and should be) a switch statement.  However, it caused
  // Internal compiler error 980331 with egcs 1.1 (2.91.57).
  // So, the pointer-to-member-function temporary has been removed.
  if (msg_type == ACE_Name_Request::LIST_NAME_ENTRIES)
    {
#if 0
      ACE_DEBUG ((LM_DEBUG,
                  "request for LIST_NAME_ENTRIES \n"));
#endif /* 0 */
      result = NAMING_CONTEXT::instance ()->
        ACE_Naming_Context::list_name_entries (set, pattern);
    }
  else if (msg_type == ACE_Name_Request::LIST_VALUE_ENTRIES)
    {
#if 0
      ACE_DEBUG ((LM_DEBUG,
                  "request for LIST_VALUE_ENTRIES \n"));
#endif /* 0 */
      result = NAMING_CONTEXT::instance ()->
        ACE_Naming_Context::list_value_entries (set, pattern);
    }
  else if (msg_type == ACE_Name_Request::LIST_TYPE_ENTRIES)
    {
#if 0
      ACE_DEBUG ((LM_DEBUG,
                  "request for LIST_TYPE_ENTRIES \n"));
#endif /* 0 */
      result = NAMING_CONTEXT::instance ()->
        ACE_Naming_Context::list_type_entries (set, pattern);
    }
  else
    return -1;

  if (result == 0)
    {
      ACE_Name_Binding *one_entry = 0;

      for (ACE_Unbounded_Set_Iterator<ACE_Name_Binding> set_iterator (set);
           set_iterator.next (one_entry) !=0;
           set_iterator.advance())
        {
           ACE_Auto_Basic_Array_Ptr<ACE_WCHAR_T>
             name_urep (one_entry->name_.rep ());
           ACE_Auto_Basic_Array_Ptr<ACE_WCHAR_T>
             value_urep (one_entry->value_.rep ());
           ACE_Name_Request mynrq (this->name_request_.msg_type (),
                                  name_urep.get (),
                                  one_entry->name_.length () * sizeof (ACE_WCHAR_T),
                                  value_urep.get (),
                                  one_entry->value_.length () * sizeof (ACE_WCHAR_T),
                                  one_entry->type_,
                                  ACE_OS::strlen (one_entry->type_));

          if (this->send_request (mynrq) == -1)
            return -1;
        }

      // send last message indicator
      ACE_Name_Request nrq (ACE_Name_Request::MAX_ENUM, 0, 0, 0, 0, 0, 0);

      if (this->send_request (nrq) == -1)
        return -1;
    }
  else
    {
      // None found so send blank request back.
      ACE_Name_Request end_rq (ACE_Name_Request::MAX_ENUM, 0, 0, 0, 0, 0, 0);

      if (this->send_request (end_rq) == -1)
        return -1;
    }

  return 0;
}

ACE_Name_Handler::~ACE_Name_Handler (void)
{
  ACE_TRACE ("ACE_Name_Handler::~ACE_Name_Handler");
#if 0
  ACE_DEBUG ((LM_DEBUG, "closing down Handle  %d\n",
              this->get_handle ()));
#endif /* 0 */
}