769 lines
23 KiB
C
769 lines
23 KiB
C
/****************************************************************************
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* net/socket/connect.c
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*
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* Copyright (C) 2007-2012, 2015-2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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#ifdef CONFIG_NET
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdint.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/pthread.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/udp.h>
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#include <nuttx/net/tcp.h>
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#include "devif/devif.h"
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#include "tcp/tcp.h"
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#include "udp/udp.h"
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#include "local/local.h"
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#include "socket/socket.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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struct tcp_connect_s
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{
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FAR struct tcp_conn_s *tc_conn; /* Reference to TCP connection structure */
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FAR struct devif_callback_s *tc_cb; /* Reference to callback instance */
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FAR struct socket *tc_psock; /* The socket being connected */
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sem_t tc_sem; /* Semaphore signals recv completion */
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int tc_result; /* OK on success, otherwise a negated errno. */
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};
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#endif
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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static inline int psock_setup_callbacks(FAR struct socket *psock,
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FAR struct tcp_connect_s *pstate);
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static void psock_teardown_callbacks(FAR struct tcp_connect_s *pstate,
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int status);
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static uint16_t psock_connect_interrupt(FAR struct net_driver_s *dev,
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FAR void *pvconn, FAR void *pvpriv,
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uint16_t flags);
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static inline int psock_tcp_connect(FAR struct socket *psock,
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FAR const struct sockaddr *addr);
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#endif /* CONFIG_NET_TCP */
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_setup_callbacks
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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static inline int psock_setup_callbacks(FAR struct socket *psock,
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FAR struct tcp_connect_s *pstate)
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{
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FAR struct tcp_conn_s *conn = psock->s_conn;
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int ret = -EBUSY;
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/* Initialize the TCP state structure */
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/* This semaphore is used for signaling and, hence, should not have
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* priority inheritance enabled.
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*/
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(void)sem_init(&pstate->tc_sem, 0, 0); /* Doesn't really fail */
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(void)sem_setprotocol(&pstate->tc_sem, SEM_PRIO_NONE);
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pstate->tc_conn = conn;
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pstate->tc_psock = psock;
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pstate->tc_result = -EAGAIN;
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/* Set up the callbacks in the connection */
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pstate->tc_cb = tcp_callback_alloc(conn);
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if (pstate->tc_cb)
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{
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/* Set up the connection "interrupt" handler */
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pstate->tc_cb->flags = (TCP_NEWDATA | TCP_CLOSE | TCP_ABORT |
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TCP_TIMEDOUT | TCP_CONNECTED | NETDEV_DOWN);
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pstate->tc_cb->priv = (FAR void *)pstate;
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pstate->tc_cb->event = psock_connect_interrupt;
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ret = OK;
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}
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return ret;
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}
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#endif /* CONFIG_NET_TCP */
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/****************************************************************************
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* Name: psock_teardown_callbacks
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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static void psock_teardown_callbacks(FAR struct tcp_connect_s *pstate,
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int status)
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{
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FAR struct tcp_conn_s *conn = pstate->tc_conn;
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/* Make sure that no further interrupts are processed */
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tcp_callback_free(conn, pstate->tc_cb);
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pstate->tc_cb = NULL;
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/* If we successfully connected, we will continue to monitor the connection
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* state via callbacks.
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*/
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if (status < 0)
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{
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/* Failed to connect. Stop the connection event monitor */
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net_stopmonitor(conn);
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}
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}
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#endif /* CONFIG_NET_TCP */
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/****************************************************************************
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* Name: psock_connect_interrupt
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*
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* Description:
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* This function is called from the interrupt level to perform the actual
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* connection operation via by the lower, device interfacing layer.
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*
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* Parameters:
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* dev The structure of the network driver that caused the interrupt
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* pvconn The connection structure associated with the socket
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* flags Set of events describing why the callback was invoked
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*
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* Returned Value:
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* The new flags setting
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*
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* Assumptions:
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* Running at the interrupt level
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*
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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static uint16_t psock_connect_interrupt(FAR struct net_driver_s *dev,
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FAR void *pvconn, FAR void *pvpriv,
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uint16_t flags)
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{
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struct tcp_connect_s *pstate = (struct tcp_connect_s *)pvpriv;
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ninfo("flags: %04x\n", flags);
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/* 'priv' might be null in some race conditions (?) */
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if (pstate)
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{
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/* The following errors should be detected here (someday)
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*
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* ECONNREFUSED
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* No one listening on the remote address.
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* ENETUNREACH
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* Network is unreachable.
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* ETIMEDOUT
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* Timeout while attempting connection. The server may be too busy
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* to accept new connections.
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*/
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/* TCP_CLOSE: The remote host has closed the connection
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* TCP_ABORT: The remote host has aborted the connection
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*/
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if ((flags & (TCP_CLOSE | TCP_ABORT)) != 0)
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{
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/* Indicate that remote host refused the connection */
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pstate->tc_result = -ECONNREFUSED;
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}
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/* TCP_TIMEDOUT: Connection aborted due to too many retransmissions. */
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else if ((flags & TCP_TIMEDOUT) != 0)
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{
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/* Indicate that the connection timedout?) */
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pstate->tc_result = -ETIMEDOUT;
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}
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else if ((flags & NETDEV_DOWN) != 0)
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{
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/* The network device went down. Indicate that the remote host
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* is unreachable.
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*/
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pstate->tc_result = -ENETUNREACH;
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}
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/* TCP_CONNECTED: The socket is successfully connected */
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else if ((flags & TCP_CONNECTED) != 0)
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{
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FAR struct socket *psock = pstate->tc_psock;
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DEBUGASSERT(psock);
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/* Mark the connection bound and connected. NOTE this is
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* is done here (vs. later) in order to avoid any race condition
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* in the socket state. It is known to connected here and now,
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* but not necessarily at any time later.
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*/
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psock->s_flags |= (_SF_BOUND | _SF_CONNECTED);
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/* Indicate that the socket is no longer connected */
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pstate->tc_result = OK;
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}
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/* Otherwise, it is not an event of importance to us at the moment */
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else
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{
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/* Drop data received in this state */
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dev->d_len = 0;
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return flags & ~TCP_NEWDATA;
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}
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ninfo("Resuming: %d\n", pstate->tc_result);
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/* Stop further callbacks */
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psock_teardown_callbacks(pstate, pstate->tc_result);
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#ifdef CONFIG_NET_MULTILINK
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/* When we set up the connection structure, we did not know the size
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* of the initial MSS. Now that the connection is associated with a
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* network device, we now know the size of link layer header and can
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* determine the correct initial MSS.
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*/
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DEBUGASSERT(pstate->tc_conn);
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#ifdef CONFIG_NET_IPv4
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#ifdef CONFIG_NET_IPv6
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if (pstate->tc_conn->domain == PF_INET)
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#endif
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{
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pstate->tc_conn->mss = TCP_IPv4_INITIAL_MSS(dev);
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}
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#endif /* CONFIG_NET_IPv4 */
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#ifdef CONFIG_NET_IPv6
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#ifdef CONFIG_NET_IPv4
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else
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#endif
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{
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pstate->tc_conn->mss = TCP_IPv4_INITIAL_MSS(dev);
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}
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#endif /* CONFIG_NET_IPv6 */
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#ifdef CONFIG_NETDEV_MULTINIC
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/* We now have to filter all outgoing transfers so that they use only
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* the MSS of this device.
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*/
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DEBUGASSERT(pstate->tc_conn->dev == NULL ||
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pstate->tc_conn->dev == dev);
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pstate->tc_conn->dev = dev;
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#endif /* CONFIG_NETDEV_MULTINIC */
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#endif /* CONFIG_NET_MULTILINK */
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/* Wake up the waiting thread */
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sem_post(&pstate->tc_sem);
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}
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return flags;
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}
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#endif /* CONFIG_NET_TCP */
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/****************************************************************************
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* Name: psock_tcp_connect
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*
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* Description:
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* Perform a TCP connection
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*
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* Parameters:
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* psock - A reference to the socket structure of the socket to be connected
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* addr - The address of the remote server to connect to
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Running at the interrupt level
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*
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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static inline int psock_tcp_connect(FAR struct socket *psock,
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FAR const struct sockaddr *addr)
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{
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struct tcp_connect_s state;
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int ret = OK;
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|
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/* Interrupts must be disabled through all of the following because
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* we cannot allow the network callback to occur until we are completely
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* setup.
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*/
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net_lock();
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/* Get the connection reference from the socket */
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if (!psock->s_conn) /* Should always be non-NULL */
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{
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ret = -EINVAL;
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}
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else
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{
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/* Perform the TCP connection operation */
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ret = tcp_connect(psock->s_conn, addr);
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}
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if (ret >= 0)
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{
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/* Set up the callbacks in the connection */
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|
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ret = psock_setup_callbacks(psock, &state);
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if (ret >= 0)
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{
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/* Wait for either the connect to complete or for an error/timeout
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* to occur. NOTES: (1) net_lockedwait will also terminate if a signal
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* is received, (2) interrupts may be disabled! They will be re-
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* enabled while the task sleeps and automatically re-disabled
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* when the task restarts.
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*/
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ret = net_lockedwait(&state.tc_sem);
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|
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/* Uninitialize the state structure */
|
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|
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(void)sem_destroy(&state.tc_sem);
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|
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/* If net_lockedwait failed, recover the negated error (probably -EINTR) */
|
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|
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if (ret < 0)
|
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{
|
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ret = -get_errno();
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}
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else
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{
|
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/* If the wait succeeded, then get the new error value from
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* the state structure
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*/
|
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|
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ret = state.tc_result;
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}
|
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/* Make sure that no further interrupts are processed */
|
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|
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psock_teardown_callbacks(&state, ret);
|
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}
|
|
|
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/* Check if the socket was successfully connected. */
|
|
|
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if (ret >= 0)
|
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{
|
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/* Yes... Now that we are connected, we need to set up to monitor
|
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* the state of the connection up the connection event monitor.
|
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*/
|
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|
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ret = net_startmonitor(psock);
|
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if (ret < 0)
|
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{
|
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/* net_startmonitor() can only fail on certain race
|
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* conditions where the connection was lost just before
|
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* this function was called. That is not expected to
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* happen in this context, but just in case...
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*/
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|
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net_lostconnection(psock, TCP_ABORT);
|
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}
|
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}
|
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}
|
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|
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net_unlock();
|
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return ret;
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}
|
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#endif /* CONFIG_NET_TCP */
|
|
|
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/****************************************************************************
|
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* Public Functions
|
|
****************************************************************************/
|
|
/****************************************************************************
|
|
* Name: psock_connect
|
|
*
|
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* Description:
|
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* connect() connects the socket referred to by the structure 'psock'
|
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* to the address specified by 'addr'. The addrlen argument specifies
|
|
* the size of 'addr'. The format of the address in 'addr' is
|
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* determined by the address space of the socket 'psock'.
|
|
*
|
|
* If the socket 'psock' is of type SOCK_DGRAM then 'addr' is the address
|
|
* to which datagrams are sent by default, and the only address from which
|
|
* datagrams are received. If the socket is of type SOCK_STREAM or
|
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* SOCK_SEQPACKET, this call attempts to make a connection to the socket
|
|
* that is bound to the address specified by 'addr'.
|
|
*
|
|
* Generally, connection-based protocol sockets may successfully connect()
|
|
* only once; connectionless protocol sockets may use connect() multiple
|
|
* times to change their association. Connectionless sockets may dissolve
|
|
* the association by connecting to an address with the sa_family member of
|
|
* sockaddr set to AF_UNSPEC.
|
|
*
|
|
* Parameters:
|
|
* psock Pointer to a socket structure initialized by psock_socket()
|
|
* addr Server address (form depends on type of socket)
|
|
* addrlen Length of actual 'addr'
|
|
*
|
|
* Returned Value:
|
|
* 0 on success; -1 on error with errno set appropriately
|
|
*
|
|
* EACCES, EPERM
|
|
* The user tried to connect to a broadcast address without having the
|
|
* socket broadcast flag enabled or the connection request failed
|
|
* because of a local firewall rule.
|
|
* EADDRINUSE
|
|
* Local address is already in use.
|
|
* EAFNOSUPPORT
|
|
* The passed address didn't have the correct address family in its
|
|
* sa_family field.
|
|
* EAGAIN
|
|
* No more free local ports or insufficient entries in the routing
|
|
* cache.
|
|
* EALREADY
|
|
* The socket is non-blocking and a previous connection attempt has
|
|
* not yet been completed.
|
|
* EBADF
|
|
* The file descriptor is not a valid index in the descriptor table.
|
|
* ECONNREFUSED
|
|
* No one listening on the remote address.
|
|
* EFAULT
|
|
* The socket structure address is outside the user's address space.
|
|
* EINPROGRESS
|
|
* The socket is non-blocking and the connection cannot be completed
|
|
* immediately.
|
|
* EINTR
|
|
* The system call was interrupted by a signal that was caught.
|
|
* EISCONN
|
|
* The socket is already connected.
|
|
* ENETUNREACH
|
|
* Network is unreachable.
|
|
* ENOTSOCK
|
|
* The file descriptor is not associated with a socket.
|
|
* ETIMEDOUT
|
|
* Timeout while attempting connection. The server may be too busy
|
|
* to accept new connections.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
int psock_connect(FAR struct socket *psock, FAR const struct sockaddr *addr,
|
|
socklen_t addrlen)
|
|
{
|
|
FAR const struct sockaddr_in *inaddr = (FAR const struct sockaddr_in *)addr;
|
|
#if defined(CONFIG_NET_TCP) || defined(CONFIG_NET_UDP) || defined(CONFIG_NET_LOCAL)
|
|
int ret;
|
|
#endif
|
|
int errcode;
|
|
|
|
/* Treat as a cancellation point */
|
|
|
|
(void)enter_cancellation_point();
|
|
|
|
/* Verify that the psock corresponds to valid, allocated socket */
|
|
|
|
if (!psock || psock->s_crefs <= 0)
|
|
{
|
|
errcode = EBADF;
|
|
goto errout;
|
|
}
|
|
|
|
/* Verify that a valid address has been provided */
|
|
|
|
switch (inaddr->sin_family)
|
|
{
|
|
#ifdef CONFIG_NET_IPv4
|
|
case AF_INET:
|
|
{
|
|
if (addrlen < sizeof(struct sockaddr_in))
|
|
{
|
|
errcode = EBADF;
|
|
goto errout;
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
case AF_INET6:
|
|
{
|
|
if (addrlen < sizeof(struct sockaddr_in6))
|
|
{
|
|
errcode = EBADF;
|
|
goto errout;
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_LOCAL
|
|
case AF_LOCAL:
|
|
{
|
|
if (addrlen < sizeof(sa_family_t))
|
|
{
|
|
errcode = EBADF;
|
|
goto errout;
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
DEBUGPANIC();
|
|
errcode = EAFNOSUPPORT;
|
|
goto errout;
|
|
}
|
|
|
|
/* Perform the connection depending on the protocol type */
|
|
|
|
switch (psock->s_type)
|
|
{
|
|
#if defined(CONFIG_NET_TCP) || defined(CONFIG_NET_LOCAL_STREAM)
|
|
case SOCK_STREAM:
|
|
{
|
|
/* Verify that the socket is not already connected */
|
|
|
|
if (_SS_ISCONNECTED(psock->s_flags))
|
|
{
|
|
errcode = EISCONN;
|
|
goto errout;
|
|
}
|
|
|
|
/* It's not ... connect it */
|
|
|
|
#ifdef CONFIG_NET_LOCAL_STREAM
|
|
#ifdef CONFIG_NET_TCP
|
|
if (psock->s_domain == PF_LOCAL)
|
|
#endif
|
|
{
|
|
/* Connect to the local Unix domain server */
|
|
|
|
ret = psock_local_connect(psock, addr);
|
|
}
|
|
#endif /* CONFIG_NET_LOCAL_STREAM */
|
|
|
|
#ifdef CONFIG_NET_TCP
|
|
#ifdef CONFIG_NET_LOCAL_STREAM
|
|
else
|
|
#endif
|
|
{
|
|
/* Connect the TCP/IP socket */
|
|
|
|
ret = psock_tcp_connect(psock, addr);
|
|
}
|
|
#endif /* CONFIG_NET_TCP */
|
|
|
|
if (ret < 0)
|
|
{
|
|
errcode = -ret;
|
|
goto errout;
|
|
}
|
|
}
|
|
break;
|
|
#endif /* CONFIG_NET_TCP || CONFIG_NET_LOCAL_STREAM */
|
|
|
|
#if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_LOCAL_DGRAM)
|
|
case SOCK_DGRAM:
|
|
{
|
|
#ifdef CONFIG_NET_LOCAL_DGRAM
|
|
#ifdef CONFIG_NET_UDP
|
|
if (psock->s_domain == PF_LOCAL)
|
|
#endif
|
|
{
|
|
/* Perform the datagram connection logic */
|
|
|
|
ret = psock_local_connect(psock, addr);
|
|
}
|
|
#endif /* CONFIG_NET_LOCAL_DGRAM */
|
|
|
|
#ifdef CONFIG_NET_UDP
|
|
#ifdef CONFIG_NET_LOCAL_DGRAM
|
|
else
|
|
#endif
|
|
{
|
|
ret = udp_connect(psock->s_conn, addr);
|
|
if (ret < 0 || addr == NULL)
|
|
{
|
|
psock->s_flags &= ~_SF_CONNECTED;
|
|
}
|
|
else
|
|
{
|
|
psock->s_flags |= _SF_CONNECTED;
|
|
}
|
|
}
|
|
#endif /* CONFIG_NET_UDP */
|
|
|
|
if (ret < 0)
|
|
{
|
|
errcode = -ret;
|
|
goto errout;
|
|
}
|
|
}
|
|
break;
|
|
#endif /* CONFIG_NET_UDP || CONFIG_NET_LOCAL_DGRAM */
|
|
|
|
default:
|
|
errcode = EBADF;
|
|
goto errout;
|
|
}
|
|
|
|
leave_cancellation_point();
|
|
return OK;
|
|
|
|
errout:
|
|
set_errno(errcode);
|
|
leave_cancellation_point();
|
|
return ERROR;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: connect
|
|
*
|
|
* Description:
|
|
* connect() connects the socket referred to by the file descriptor 'sockfd'
|
|
* to the address specified by 'addr'. The addrlen argument specifies
|
|
* the size of 'addr'. The format of the address in 'addr' is
|
|
* determined by the address space of the socket 'sockfd'.
|
|
*
|
|
* If the socket 'sockfd' is of type SOCK_DGRAM then 'addr' is the address
|
|
* to which datagrams are sent by default, and the only address from which
|
|
* datagrams are received. If the socket is of type SOCK_STREAM or
|
|
* SOCK_SEQPACKET, this call attempts to make a connection to the socket
|
|
* that is bound to the address specified by 'addr'.
|
|
*
|
|
* Generally, connection-based protocol sockets may successfully connect()
|
|
* only once; connectionless protocol sockets may use connect() multiple
|
|
* times to change their association. Connectionless sockets may dissolve
|
|
* the association by connecting to an address with the sa_family member of
|
|
* sockaddr set to AF_UNSPEC.
|
|
*
|
|
* Parameters:
|
|
* sockfd Socket descriptor returned by socket()
|
|
* addr Server address (form depends on type of socket)
|
|
* addrlen Length of actual 'addr'
|
|
*
|
|
* Returned Value:
|
|
* 0 on success; -1 on error with errno set appropriately
|
|
*
|
|
* EACCES, EPERM
|
|
* The user tried to connect to a broadcast address without having the
|
|
* socket broadcast flag enabled or the connection request failed
|
|
* because of a local firewall rule.
|
|
* EADDRINUSE
|
|
* Local address is already in use.
|
|
* EAFNOSUPPORT
|
|
* The passed address didn't have the correct address family in its
|
|
* sa_family field.
|
|
* EAGAIN
|
|
* No more free local ports or insufficient entries in the routing
|
|
* cache.
|
|
* EALREADY
|
|
* The socket is non-blocking and a previous connection attempt has
|
|
* not yet been completed.
|
|
* EBADF
|
|
* The file descriptor is not a valid index in the descriptor table.
|
|
* ECONNREFUSED
|
|
* No one listening on the remote address.
|
|
* EFAULT
|
|
* The socket structure address is outside the user's address space.
|
|
* EINPROGRESS
|
|
* The socket is non-blocking and the connection cannot be completed
|
|
* immediately.
|
|
* EINTR
|
|
* The system call was interrupted by a signal that was caught.
|
|
* EISCONN
|
|
* The socket is already connected.
|
|
* ENETUNREACH
|
|
* Network is unreachable.
|
|
* ENOTSOCK
|
|
* The file descriptor is not associated with a socket.
|
|
* ETIMEDOUT
|
|
* Timeout while attempting connection. The server may be too busy
|
|
* to accept new connections.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
int connect(int sockfd, FAR const struct sockaddr *addr, socklen_t addrlen)
|
|
{
|
|
int ret;
|
|
|
|
/* accept() is a cancellation point */
|
|
|
|
(void)enter_cancellation_point();
|
|
|
|
/* Get the underlying socket structure */
|
|
|
|
FAR struct socket *psock = sockfd_socket(sockfd);
|
|
|
|
/* Then let psock_connect() do all of the work */
|
|
|
|
ret = psock_connect(psock, addr, addrlen);
|
|
leave_cancellation_point();
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_NET */
|