text: /****************************************************************************
   * net/usrsock/usrsock_getpeername.c
   *
   *   Copyright (C) 2017 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>
  #if defined(CONFIG_NET) && defined(CONFIG_NET_USRSOCK)
  
  #include <stdint.h>
  #include <string.h>
  #include <assert.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <arch/irq.h>
  
  #include <sys/socket.h>
  #include <nuttx/semaphore.h>
  #include <nuttx/net/net.h>
  #include <nuttx/net/usrsock.h>
  
  #include "usrsock/usrsock.h"
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  static uint16_t getpeername_event(FAR struct net_driver_s *dev,
                                    FAR void *pvconn,
                                    FAR void *pvpriv, uint16_t flags)
  {
    FAR struct usrsock_data_reqstate_s *pstate = pvpriv;
    FAR struct usrsock_conn_s *conn = pvconn;
  
    if (flags & USRSOCK_EVENT_ABORT)
      {
        ninfo("socket aborted.\n");
  
        pstate->reqstate.result = -ECONNABORTED;
        pstate->valuelen = 0;
  
        /* Stop further callbacks */
  
        pstate->reqstate.cb->flags   = 0;
        pstate->reqstate.cb->priv    = NULL;
        pstate->reqstate.cb->event   = NULL;
  
        /* Wake up the waiting thread */
  
        nxsem_post(&pstate->reqstate.recvsem);
      }
    else if (flags & USRSOCK_EVENT_REQ_COMPLETE)
      {
        ninfo("request completed.\n");
  
        pstate->reqstate.result = conn->resp.result;
        if (pstate->reqstate.result < 0)
          {
            pstate->valuelen = 0;
            pstate->valuelen_nontrunc = 0;
          }
        else
          {
            pstate->valuelen = conn->resp.valuelen;
            pstate->valuelen_nontrunc = conn->resp.valuelen_nontrunc;
          }
  
        /* Stop further callbacks */
  
        pstate->reqstate.cb->flags   = 0;
        pstate->reqstate.cb->priv    = NULL;
        pstate->reqstate.cb->event   = NULL;
  
        /* Wake up the waiting thread */
  
        nxsem_post(&pstate->reqstate.recvsem);
      }
  
    return flags;
  }
  
  /****************************************************************************
   * Name: do_getsockopt_request
   ****************************************************************************/
  
  static int do_getpeername_request(FAR struct usrsock_conn_s *conn,
                                    socklen_t addrlen)
  {
    struct usrsock_request_getpeername_s req =
    {
    };
  
    struct iovec bufs[1];
  
    if (addrlen > UINT16_MAX)
      {
        addrlen = UINT16_MAX;
      }
  
    /* Prepare request for daemon to read. */
  
    req.head.reqid = USRSOCK_REQUEST_GETPEERNAME;
    req.usockid = conn->usockid;
    req.max_addrlen = addrlen;
  
    bufs[0].iov_base = (FAR void *)&req;
    bufs[0].iov_len = sizeof(req);
  
    return usrsockdev_do_request(conn, bufs, ARRAY_SIZE(bufs));
  }
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: usrsock_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:
   *   conn     usrsock socket connection structure
   *   addr     sockaddr structure to receive data [out]
   *   addrlen  Length of sockaddr structure [in/out]
   *
   ****************************************************************************/
  
  int usrsock_getpeername(FAR struct socket *psock,
                          FAR struct sockaddr *addr, FAR socklen_t *addrlen)
  {
    FAR struct usrsock_conn_s *conn = psock->s_conn;
    struct usrsock_data_reqstate_s state =
    {
    };
  
    struct iovec inbufs[1];
    ssize_t ret;
    socklen_t outaddrlen = 0;
  
    net_lock();
  
    if (conn->state == USRSOCK_CONN_STATE_UNINITIALIZED ||
        conn->state == USRSOCK_CONN_STATE_ABORTED)
      {
        /* Invalid state or closed by daemon. */
  
        ninfo("usockid=%d; usrsock_getpeername() with uninitialized usrsock.\n",
              conn->usockid);
  
        ret = (conn->state == USRSOCK_CONN_STATE_ABORTED) ? -EPIPE :
              -ECONNRESET;
        goto errout_unlock;
      }
  
    /* Set up event callback for usrsock. */
  
    ret = usrsock_setup_data_request_callback(
        conn, &state, getpeername_event,
        USRSOCK_EVENT_ABORT | USRSOCK_EVENT_REQ_COMPLETE);
    if (ret < 0)
      {
        nwarn("usrsock_setup_request_callback failed: %d\n", ret);
        goto errout_unlock;
      }
  
    inbufs[0].iov_base = (FAR void *)addr;
    inbufs[0].iov_len = *addrlen;
  
    usrsock_setup_datain(conn, inbufs, ARRAY_SIZE(inbufs));
  
    /* Request user-space daemon to close socket. */
  
    ret = do_getpeername_request(conn, *addrlen);
    if (ret >= 0)
      {
        /* Wait for completion of request. */
  
        net_lockedwait_uninterruptible(&state.reqstate.recvsem);
        ret = state.reqstate.result;
  
        DEBUGASSERT(state.valuelen <= *addrlen);
        DEBUGASSERT(state.valuelen <= state.valuelen_nontrunc);
  
        if (ret >= 0)
          {
            /* Store length of data that was written to 'value' buffer. */
  
            outaddrlen = state.valuelen_nontrunc;
          }
      }
  
    usrsock_teardown_datain(conn);
    usrsock_teardown_data_request_callback(&state);
  
  errout_unlock:
    net_unlock();
  
    *addrlen = outaddrlen;
    return ret;
  }
  
  #endif /* CONFIG_NET && CONFIG_NET_USRSOCK */
  