452 lines
13 KiB
C
452 lines
13 KiB
C
/****************************************************************************
|
|
* net/usrsock/usrsock_accept.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#if defined(CONFIG_NET) && defined(CONFIG_NET_USRSOCK)
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/net/net.h>
|
|
#include <nuttx/net/usrsock.h>
|
|
|
|
#include "usrsock/usrsock.h"
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
static uint16_t accept_event(FAR struct net_driver_s *dev,
|
|
FAR void *pvpriv, uint16_t flags)
|
|
{
|
|
FAR struct usrsock_data_reqstate_s *pstate = pvpriv;
|
|
FAR struct usrsock_conn_s *conn = pstate->reqstate.conn;
|
|
|
|
if (flags & USRSOCK_EVENT_ABORT)
|
|
{
|
|
ninfo("socket aborted.\n");
|
|
|
|
pstate->reqstate.result = -ECONNABORTED;
|
|
pstate->valuelen = 0;
|
|
pstate->valuelen_nontrunc = 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;
|
|
}
|
|
|
|
if (pstate->reqstate.result >= 0 ||
|
|
pstate->reqstate.result == -EAGAIN)
|
|
{
|
|
/* After reception of connection, mark input not ready. Daemon will
|
|
* send event to restore this flag.
|
|
*/
|
|
|
|
conn->flags &= ~USRSOCK_EVENT_RECVFROM_AVAIL;
|
|
}
|
|
|
|
/* 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_REMOTE_CLOSED)
|
|
{
|
|
ninfo("remote closed.\n");
|
|
|
|
pstate->reqstate.result = -EPIPE;
|
|
|
|
/* 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_RECVFROM_AVAIL)
|
|
{
|
|
ninfo("accept avail.\n");
|
|
|
|
flags &= ~USRSOCK_EVENT_RECVFROM_AVAIL;
|
|
|
|
/* 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_accept_request
|
|
****************************************************************************/
|
|
|
|
static int do_accept_request(FAR struct usrsock_conn_s *conn,
|
|
socklen_t addrlen)
|
|
{
|
|
struct usrsock_request_accept_s req =
|
|
{
|
|
};
|
|
|
|
struct iovec bufs[1];
|
|
|
|
if (addrlen > UINT16_MAX)
|
|
{
|
|
addrlen = UINT16_MAX;
|
|
}
|
|
|
|
/* Prepare request for daemon to read. */
|
|
|
|
req.head.reqid = USRSOCK_REQUEST_ACCEPT;
|
|
req.usockid = conn->usockid;
|
|
req.max_addrlen = addrlen;
|
|
|
|
bufs[0].iov_base = &req;
|
|
bufs[0].iov_len = sizeof(req);
|
|
|
|
return usrsock_do_request(conn, bufs, nitems(bufs));
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: usrsock_accept
|
|
*
|
|
* Description:
|
|
* The usrsock_accept function is used with connection-based socket
|
|
* types (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first
|
|
* connection request on the queue of pending connections, creates a new
|
|
* connected socket with mostly the same properties as 'psock', and
|
|
* allocates a new socket descriptor for the socket, which is returned. The
|
|
* newly created socket is no longer in the listening state. The original
|
|
* socket 'psock' is unaffected by this call. Per file descriptor flags
|
|
* are not inherited across an usrsock_accept.
|
|
*
|
|
* The 'psock' argument is a socket descriptor that has been created with
|
|
* socket(), bound to a local address with bind(), and is listening for
|
|
* connections after a call to listen().
|
|
*
|
|
* On return, the 'addr' structure is filled in with the address of the
|
|
* connecting entity. The 'addrlen' argument initially contains the size
|
|
* of the structure pointed to by 'addr'; on return it will contain the
|
|
* actual length of the address returned.
|
|
*
|
|
* If no pending connections are present on the queue, and the socket is
|
|
* not marked as non-blocking, usrsock_accept blocks the caller until a
|
|
* connection is present. If the socket is marked non-blocking and no
|
|
* pending connections are present on the queue, usrsock_accept returns
|
|
* EAGAIN.
|
|
*
|
|
* Parameters:
|
|
* psock Reference to the listening socket structure
|
|
* addr Receives the address of the connecting client
|
|
* addrlen Input: allocated size of 'addr',
|
|
* Return: returned size of 'addr'
|
|
* newsock Location to return the accepted socket information.
|
|
*
|
|
* Returned Value:
|
|
* Returns 0 (OK) on success. On failure, it returns a negated errno
|
|
* value. See accept() for a description of the appropriate error value.
|
|
*
|
|
* Assumptions:
|
|
* The network is locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int usrsock_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
|
|
FAR socklen_t *addrlen, FAR struct socket *newsock,
|
|
int flags)
|
|
{
|
|
FAR struct usrsock_conn_s *conn = psock->s_conn;
|
|
struct usrsock_data_reqstate_s state =
|
|
{
|
|
};
|
|
|
|
FAR struct usrsock_conn_s *newconn;
|
|
struct iovec inbufs[2];
|
|
socklen_t inaddrlen = 0;
|
|
socklen_t outaddrlen = 0;
|
|
int ret;
|
|
|
|
if (addrlen)
|
|
{
|
|
if (*addrlen > 0 && addr == NULL)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
inaddrlen = *addrlen;
|
|
}
|
|
|
|
net_lock();
|
|
|
|
if (conn->state == USRSOCK_CONN_STATE_UNINITIALIZED ||
|
|
conn->state == USRSOCK_CONN_STATE_ABORTED)
|
|
{
|
|
/* Invalid state or closed by daemon. */
|
|
|
|
ninfo("usockid=%d; accept() with uninitialized usrsock.\n",
|
|
conn->usockid);
|
|
|
|
ret = (conn->state == USRSOCK_CONN_STATE_ABORTED) ? -EPIPE :
|
|
-ECONNRESET;
|
|
goto errout_unlock;
|
|
}
|
|
|
|
if (conn->state == USRSOCK_CONN_STATE_CONNECTING)
|
|
{
|
|
/* Connecting. */
|
|
|
|
ninfo("usockid=%d; socket still connecting.\n",
|
|
conn->usockid);
|
|
|
|
ret = -EAGAIN;
|
|
goto errout_unlock;
|
|
}
|
|
|
|
if (!conn->connected)
|
|
{
|
|
/* Not connected. */
|
|
|
|
ninfo("usockid=%d; socket not connected.\n",
|
|
conn->usockid);
|
|
|
|
ret = -ENOTCONN;
|
|
goto errout_unlock;
|
|
}
|
|
|
|
/* Allocate the usrsock socket connection structure and save in the new
|
|
* socket instance.
|
|
*/
|
|
|
|
newconn = usrsock_alloc();
|
|
if (!newconn)
|
|
{
|
|
/* Failed to reserve a connection structure */
|
|
|
|
ret = -ENOMEM;
|
|
goto errout_unlock;
|
|
}
|
|
|
|
do
|
|
{
|
|
/* Check if remote end has closed connection. */
|
|
|
|
if (conn->flags & USRSOCK_EVENT_REMOTE_CLOSED)
|
|
{
|
|
ninfo("usockid=%d; remote closed (EOF).\n", conn->usockid);
|
|
|
|
ret = -EPIPE;
|
|
goto errout_free_conn;
|
|
}
|
|
|
|
/* Check if need to wait for connection to become available. */
|
|
|
|
if (!(conn->flags & USRSOCK_EVENT_RECVFROM_AVAIL))
|
|
{
|
|
if (_SS_ISNONBLOCK(conn->sconn.s_flags))
|
|
{
|
|
/* Nothing to receive from daemon side. */
|
|
|
|
ret = -EAGAIN;
|
|
goto errout_free_conn;
|
|
}
|
|
|
|
/* Wait accept to become avail. */
|
|
|
|
ret = usrsock_setup_data_request_callback(
|
|
conn, &state, accept_event,
|
|
USRSOCK_EVENT_ABORT | USRSOCK_EVENT_RECVFROM_AVAIL |
|
|
USRSOCK_EVENT_REMOTE_CLOSED);
|
|
if (ret < 0)
|
|
{
|
|
nwarn("usrsock_setup_request_callback failed: %d\n", ret);
|
|
goto errout_free_conn;
|
|
}
|
|
|
|
/* Wait for receive-avail (or abort, or timeout, or signal). */
|
|
|
|
ret = net_sem_timedwait(&state.reqstate.recvsem,
|
|
_SO_TIMEOUT(conn->sconn.s_rcvtimeo));
|
|
usrsock_teardown_data_request_callback(&state);
|
|
if (ret < 0)
|
|
{
|
|
if (ret == -ETIMEDOUT)
|
|
{
|
|
ninfo("accept timedout\n");
|
|
|
|
ret = -EAGAIN;
|
|
}
|
|
else if (ret == -EINTR)
|
|
{
|
|
ninfo("accept interrupted\n");
|
|
}
|
|
else
|
|
{
|
|
nerr("net_sem_timedwait errno: %d\n", ret);
|
|
DEBUGPANIC();
|
|
}
|
|
|
|
goto errout_free_conn;
|
|
}
|
|
|
|
/* Was socket aborted? */
|
|
|
|
if (conn->state == USRSOCK_CONN_STATE_ABORTED)
|
|
{
|
|
ret = -EPIPE;
|
|
goto errout_free_conn;
|
|
}
|
|
|
|
/* Did remote disconnect? */
|
|
|
|
if (conn->flags & USRSOCK_EVENT_REMOTE_CLOSED)
|
|
{
|
|
ret = -EPIPE;
|
|
goto errout_free_conn;
|
|
}
|
|
|
|
DEBUGASSERT(conn->flags & USRSOCK_EVENT_RECVFROM_AVAIL);
|
|
}
|
|
|
|
/* Set up event callback for usrsock. */
|
|
|
|
ret = usrsock_setup_data_request_callback(
|
|
conn, &state, accept_event,
|
|
USRSOCK_EVENT_ABORT | USRSOCK_EVENT_REQ_COMPLETE);
|
|
if (ret < 0)
|
|
{
|
|
nwarn("usrsock_setup_request_callback failed: %d\n", ret);
|
|
goto errout_free_conn;
|
|
}
|
|
|
|
inbufs[0].iov_base = addr;
|
|
inbufs[0].iov_len = inaddrlen;
|
|
inbufs[1].iov_base = &newconn->usockid;
|
|
inbufs[1].iov_len = sizeof(newconn->usockid);
|
|
|
|
usrsock_setup_datain(conn, inbufs, nitems(inbufs));
|
|
|
|
/* We might start getting events for this socket right after
|
|
* returning to daemon, so setup 'newconn' already here.
|
|
*/
|
|
|
|
newconn->state = USRSOCK_CONN_STATE_READY;
|
|
|
|
/* Request user-space daemon to accept socket. */
|
|
|
|
ret = do_accept_request(conn, inaddrlen);
|
|
if (ret >= 0)
|
|
{
|
|
/* Wait for completion of request. */
|
|
|
|
net_sem_wait_uninterruptible(&state.reqstate.recvsem);
|
|
ret = state.reqstate.result;
|
|
|
|
DEBUGASSERT(state.valuelen <= inaddrlen);
|
|
DEBUGASSERT(state.valuelen <= state.valuelen_nontrunc);
|
|
|
|
if (ret >= 0)
|
|
{
|
|
newconn->connected = true;
|
|
newconn->crefs = 1;
|
|
|
|
newsock->s_type = psock->s_type;
|
|
newsock->s_domain = psock->s_domain;
|
|
newsock->s_conn = newconn;
|
|
newsock->s_sockif = psock->s_sockif;
|
|
|
|
/* Store length of 'from' address that was available at
|
|
* daemon-side.
|
|
*/
|
|
|
|
outaddrlen = state.valuelen_nontrunc;
|
|
ret = OK;
|
|
}
|
|
}
|
|
|
|
usrsock_teardown_datain(conn);
|
|
usrsock_teardown_data_request_callback(&state);
|
|
}
|
|
while (ret == -EAGAIN);
|
|
|
|
if (ret >= 0)
|
|
{
|
|
goto errout_unlock;
|
|
}
|
|
|
|
errout_free_conn:
|
|
usrsock_free(newconn);
|
|
|
|
errout_unlock:
|
|
net_unlock();
|
|
|
|
if (addrlen)
|
|
{
|
|
*addrlen = outaddrlen;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_NET_USRSOCK */
|