/****************************************************************************
 * nuttx/net/socket/getpeername.c
 *
 *   Copyright (C) 2018 Pinecone Inc. All rights reserved.
 *   Author: Guiding Li<liguiding@pinecone.net>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <sys/types.h>
#include <sys/socket.h>

#include <string.h>
#include <errno.h>
#include <assert.h>

#include <nuttx/net/net.h>

#include "socket/socket.h"

#ifdef CONFIG_NET

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: psock_getpeername
 *
 * Description:
 *   The psock_getpeername() function retrieves the remote-connected name of the
 *   specified socket, stores this address in the sockaddr structure pointed
 *   to by the 'addr' argument, and stores the length of this address in the
 *   object pointed to by the 'addrlen' argument.
 *
 *   If the actual length of the address is greater than the length of the
 *   supplied sockaddr structure, the stored address will be truncated.
 *
 *   If the socket has not been bound to a local name, the value stored in
 *   the object pointed to by address is unspecified.
 *
 * Parameters:
 *   psock    Socket structure of socket to operate on
 *   addr     sockaddr structure to receive data [out]
 *   addrlen  Length of sockaddr structure [in/out]
 *
 * Returned Value:
 *   On success, 0 is returned, the 'addr' argument points to the address
 *   of the socket, and the 'addrlen' argument points to the length of the
 *   address. Otherwise, -1 is returned and errno is set to indicate the error.
 *   Possible errno values that may be returned include:
 *
 *   EBADF      - The socket argument is not a valid file descriptor.
 *   ENOTSOCK   - The socket argument does not refer to a socket.
 *   EOPNOTSUPP - The operation is not supported for this socket's protocol.
 *   EINVAL     - The socket has been shut down.
 *   ENOBUFS    - Insufficient resources were available in the system to
 *                complete the function.
 *
 ****************************************************************************/

int psock_getpeername(FAR struct socket *psock, FAR struct sockaddr *addr,
                      FAR socklen_t *addrlen)
{
  /* Verify that the psock corresponds to valid, allocated socket */

  if (psock == NULL || psock->s_crefs <= 0)
    {
      return -EBADF;
    }

  /* Some sanity checking... Shouldn't need this on a buckled up embedded
   * system (?)
   */

#ifdef CONFIG_DEBUG_FEATURES
  if (addr == NULL || *addrlen <= 0)
    {
      return -EINVAL;
    }
#endif

  /* Let the address family's send() method handle the operation */

  DEBUGASSERT(psock->s_sockif != NULL);

  if (psock->s_sockif->si_getpeername == NULL)
    {
      return -EOPNOTSUPP;
    }

  return psock->s_sockif->si_getpeername(psock, addr, addrlen);
}

/****************************************************************************
 * Name: getpeername
 *
 * Description:
 *   The getpeername() function retrieves the remote-connected name of the
 *   specified socket, stores this address in the sockaddr structure pointed
 *   to by the 'addr' argument, and stores the length of this address in the
 *   object pointed to by the 'addrlen' argument.
 *
 *   If the actual length of the address is greater than the length of the
 *   supplied sockaddr structure, the stored address will be truncated.
 *
 *   If the socket has not been bound to a local name, the value stored in
 *   the object pointed to by address is unspecified.
 *
 * Parameters:
 *   sockfd   Socket descriptor of socket [in]
 *   addr     sockaddr structure to receive data [out]
 *   addrlen  Length of sockaddr structure [in/out]
 *
 * Returned Value:
 *   On success, 0 is returned, the 'addr' argument points to the address
 *   of the socket, and the 'addrlen' argument points to the length of the
 *   address. Otherwise, -1 is returned and errno is set to indicate the error.
 *   Possible errno values that may be returned include:
 *
 *   EBADF      - The socket argument is not a valid file descriptor.
 *   ENOTSOCK   - The socket argument does not refer to a socket.
 *   EOPNOTSUPP - The operation is not supported for this socket's protocol.
 *   EINVAL     - The socket has been shut down.
 *   ENOBUFS    - Insufficient resources were available in the system to
 *                complete the function.
 *
 ****************************************************************************/

int getpeername(int sockfd, FAR struct sockaddr *addr, FAR socklen_t *addrlen)
{
  FAR struct socket *psock = sockfd_socket(sockfd);
  int ret;

  /* Let psock_getpeername() do all of the work */

  ret = psock_getpeername(psock, addr, addrlen);
  if (ret < 0)
    {
      set_errno(-ret);
      return ERROR;
    }

  return OK;
}

#endif /* CONFIG_NET */