text: /** @file
    Implement the connection to the socket driver
  
    Copyright (c) 2011, Intel Corporation
    All rights reserved. This program and the accompanying materials
    are licensed and made available under the terms and conditions of the BSD License
    which accompanies this distribution.  The full text of the license may be found at
    http://opensource.org/licenses/bsd-license.php
  
    THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
    WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  
  **/
  
  #include <Uefi.h>
  
  #include <Library/DebugLib.h>
  #include <Library/UefiBootServicesTableLib.h>
  #include <Library/UefiLib.h>
  
  #include <Protocol/EfiSocket.h>
  #include <Protocol/ServiceBinding.h>
  
  
  /**
    Free the socket resources
  
    This releases the socket resources allocated by calling
    EslServiceGetProtocol.
  
    This routine is called from the ::close routine in BsdSocketLib
    to release the socket resources.
  
    @param [in] pSocketProtocol   Address of an ::EFI_SOCKET_PROTOCOL
                                  structure
  
    @return       Value for ::errno, zero (0) indicates success.
  
   **/
  int
  EslServiceFreeProtocol (
    IN EFI_SOCKET_PROTOCOL * pSocketProtocol
    )
  {
    EFI_SERVICE_BINDING_PROTOCOL * pServiceBinding;
    int RetVal;
    EFI_STATUS Status;
  
    //
    //  Assume success
    //
    RetVal = 0;
  
    //
    //  Locate the socket protocol
    //
    Status = gBS->LocateProtocol ( &gEfiSocketServiceBindingProtocolGuid,
                                   NULL,
                                   (VOID **) &pServiceBinding );
    if ( !EFI_ERROR ( Status )) {
      //
      //  Release the handle
      //
      Status = pServiceBinding->DestroyChild ( pServiceBinding,
                                               pSocketProtocol->SocketHandle );
    }
    if ( EFI_ERROR ( Status )) {
      RetVal = EIO;
    }
  
    //
    //  Return the operation status
    //
    return RetVal;
  }
  
  
  /**
    Connect to the EFI socket library
  
    This routine establishes a connection to the socket driver
    and returns the API (::EFI_SOCKET_PROTOCOL address) to the
    socket file system layer in BsdSocketLib.  This routine looks for
    the gEfiSocketServiceBindingProtocolGuid to locate the socket
    driver.  This routine then creates a child handle and locates
    the gEfiSocketProtocolGuid protocol on that handle to get the
    ::EFI_SOCKET_PROTOCOL structure address.
  
    This routine is called from the ::socket routine in BsdSocketLib
    to create the data structure and initialize the API for a socket.
    Note that this implementation is only used by socket applications
    that link directly to UseSocketDxe.
  
    @param [in] ppSocketProtocol  Address to receive the ::EFI_SOCKET_PROTOCOL
                                  structure address
  
    @return       Value for ::errno, zero (0) indicates success.
  
   **/
  int
  EslServiceGetProtocol (
    IN EFI_SOCKET_PROTOCOL ** ppSocketProtocol
    )
  {
    EFI_SERVICE_BINDING_PROTOCOL * pServiceBinding;
    int RetVal;
    EFI_HANDLE SocketHandle;
    EFI_STATUS Status;
  
    //
    //  Locate the socket protocol
    //
    Status = gBS->LocateProtocol ( &gEfiSocketServiceBindingProtocolGuid,
                                   NULL,
                                   (VOID **)&pServiceBinding );
    if ( !EFI_ERROR ( Status )) {
      //
      //  Create a new socket
      //
      SocketHandle = NULL;
      Status = pServiceBinding->CreateChild ( pServiceBinding,
                                              &SocketHandle );
      if ( !EFI_ERROR ( Status )) {
        //
        //  Get the socket protocol
        //
        Status = gBS->OpenProtocol ( SocketHandle,
                                     &gEfiSocketProtocolGuid,
                                     (VOID **)ppSocketProtocol,
                                     NULL,
                                     NULL,
                                     EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL );
        if ( !EFI_ERROR ( Status )) {
          //
          //  Success!
          //
          RetVal = 0;
        }
        else {
          DEBUG (( DEBUG_ERROR,
                    "ERROR - No socket protocol on 0x%08x, Status: %r\r\n",
                    SocketHandle,
                    Status ));
          RetVal = ENODEV;
        }
      }
      else {
        //
        //  Translate the error
        //
        DEBUG (( DEBUG_ERROR,
                  "ERROR - CreateChild failed, Status: %r\r\n",
                  Status ));
        switch ( Status ) {
        case EFI_SUCCESS:
          RetVal = 0;
          break;
  
        case EFI_ACCESS_DENIED:
        case EFI_WRITE_PROTECTED:
          RetVal = EACCES;
          break;
  
        case EFI_NO_RESPONSE:
          RetVal = EHOSTUNREACH;
          break;
  
        case EFI_BAD_BUFFER_SIZE:
        case EFI_BUFFER_TOO_SMALL:
        case EFI_INVALID_PARAMETER:
          RetVal = EINVAL;
          break;
  
        case EFI_DEVICE_ERROR:
        case EFI_MEDIA_CHANGED:
        case EFI_NO_MEDIA:
        case EFI_VOLUME_CORRUPTED:
          RetVal = EIO;
          break;
  
        case EFI_NOT_FOUND:
          RetVal = ENOENT;
          break;
  
        default:
        case EFI_OUT_OF_RESOURCES:
          RetVal = ENOMEM;
          break;
  
        case EFI_VOLUME_FULL:
          RetVal = ENOSPC;
          break;
  
        case EFI_UNSUPPORTED:
          RetVal = ENOSYS;
          break;
  
        case EFI_NO_MAPPING:
          RetVal = ENXIO;
          break;
  
        case EFI_LOAD_ERROR:
          RetVal = ESRCH;
          break;
  
        case EFI_TIMEOUT:
          RetVal = ETIMEDOUT;
          break;
  
        case EFI_NOT_READY:
          RetVal = EWOULDBLOCK;
          break;
        }
      }
    }
    else {
      DEBUG (( DEBUG_ERROR,
                "ERROR - Socket driver not loaded, Status: %r\r\n",
                Status ));
      RetVal = ENODEV;
    }
  
    //
    //  Return the operation status
    //
    return RetVal;
  }
  