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