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incubator-nuttx/net/usrsock/usrsock_getsockname.c

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/****************************************************************************
* net/usrsock/usrsock_getsockname.c
*
* Copyright (C) 2015, 2017 Haltian Ltd. All rights reserved.
* Author: Jussi Kivilinna <jussi.kivilinna@haltian.com>
*
* 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 <semaphore.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <sys/socket.h>
#include <nuttx/net/net.h>
#include <nuttx/net/usrsock.h>
#include <nuttx/kmalloc.h>
#include "socket/socket.h"
#include "usrsock/usrsock.h"
/****************************************************************************
* Private Functions
****************************************************************************/
static uint16_t getsockname_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 */
sem_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 */
sem_post(&pstate->reqstate.recvsem);
}
return flags;
}
/****************************************************************************
* Name: do_getsockopt_request
****************************************************************************/
static int do_getsockname_request(FAR struct usrsock_conn_s *conn,
socklen_t addrlen)
{
struct usrsock_request_getsockname_s req = {};
struct iovec bufs[1];
if (addrlen > UINT16_MAX)
{
addrlen = UINT16_MAX;
}
/* Prepare request for daemon to read. */
req.head.reqid = USRSOCK_REQUEST_GETSOCKNAME;
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));
}
/****************************************************************************
* Name: setup_conn_getsockopt
****************************************************************************/
static void setup_conn_getsockname(FAR struct usrsock_conn_s *conn,
FAR struct iovec *iov,
unsigned int iovcnt)
{
unsigned int i;
conn->resp.datain.iov = iov;
conn->resp.datain.pos = 0;
conn->resp.datain.total = 0;
conn->resp.datain.iovcnt = iovcnt;
for (i = 0; i < iovcnt; i++)
{
conn->resp.datain.total += iov[i].iov_len;
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usrsock_getsockname
*
* Description:
* The getsockname() function retrieves the locally-bound 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_getsockname(FAR struct usrsock_conn_s *conn,
FAR struct sockaddr *addr, FAR socklen_t *addrlen)
{
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; connect() 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, getsockname_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;
setup_conn_getsockname(conn, inbufs, ARRAY_SIZE(inbufs));
/* Request user-space daemon to close socket. */
ret = do_getsockname_request(conn, *addrlen);
if (ret >= 0)
{
/* Wait for completion of request. */
while (net_lockedwait(&state.reqstate.recvsem) != OK)
{
DEBUGASSERT(*get_errno_ptr() == EINTR);
}
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;
}
}
setup_conn_getsockname(conn, NULL, 0);
usrsock_teardown_data_request_callback(&state);
errout_unlock:
net_unlock();
*addrlen = outaddrlen;
return ret;
}
#endif /* CONFIG_NET && CONFIG_NET_USRSOCK */
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