604 lines
19 KiB
C
604 lines
19 KiB
C
/****************************************************************************
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* net/socket/connect.c
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*
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* Copyright (C) 2007-2012 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 <debug.h>
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#include <arch/irq.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/tcp.h>
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#include <nuttx/net/udp.h>
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#include "socket/socket.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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/****************************************************************************
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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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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 inline 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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#ifdef CONFIG_NET_IPv6
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static inline int psock_tcp_connect(FAR struct socket *psock,
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FAR const struct sockaddr_in6 *inaddr);
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#else
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static inline int psock_tcp_connect(FAR struct socket *psock, const struct sockaddr_in *inaddr);
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#endif
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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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(void)sem_init(&pstate->tc_sem, 0, 0); /* Doesn't really fail */
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pstate->tc_conn = conn;
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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 = UIP_NEWDATA|UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT|UIP_CONNECTED;
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pstate->tc_cb->priv = (void*)pstate;
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pstate->tc_cb->event = psock_connect_interrupt;
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/* Set up the connection event monitor */
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net_startmonitor(psock);
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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 inline 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 uIP layer.
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*
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* Parameters:
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* dev The sructure 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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nllvdbg("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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/* UIP_CLOSE: The remote host has closed the connection
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* UIP_ABORT: The remote host has aborted the connection
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*/
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if ((flags & (UIP_CLOSE|UIP_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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/* UIP_TIMEDOUT: Connection aborted due to too many retransmissions. */
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else if ((flags & UIP_TIMEDOUT) != 0)
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{
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/* Indicate that the remote host is unreachable (or should this be timedout?) */
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pstate->tc_result = -ETIMEDOUT;
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}
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/* UIP_CONNECTED: The socket is successfully connected */
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else if ((flags & UIP_CONNECTED) != 0)
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{
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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 & ~UIP_NEWDATA;
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}
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nllvdbg("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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/* 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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* inaddr 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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#ifdef CONFIG_NET_IPv6
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static inline int psock_tcp_connect(FAR struct socket *psock,
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FAR const struct sockaddr_in6 *inaddr)
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#else
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static inline int psock_tcp_connect(FAR struct socket *psock,
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FAR const struct sockaddr_in *inaddr)
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#endif
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{
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struct tcp_connect_s state;
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net_lock_t flags;
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int ret = OK;
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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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flags = 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 uIP connection operation */
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ret = tcp_connect(psock->s_conn, inaddr);
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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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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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/* Uninitialize the state structure */
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(void)sem_destroy(&state.tc_sem);
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/* If net_lockedwait failed, recover the negated error (probably -EINTR) */
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if (ret < 0)
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{
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ret = -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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ret = state.tc_result;
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}
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/* Make sure that no further interrupts are processed */
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psock_teardown_callbacks(&state, ret);
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}
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/* Mark the connection bound and connected */
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if (ret >= 0)
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{
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psock->s_flags |= (_SF_BOUND|_SF_CONNECTED);
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}
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}
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net_unlock(flags);
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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
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****************************************************************************/
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/****************************************************************************
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* Name: psock_connect
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*
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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
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* 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'.
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*
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* If the socket 'psock' is of type SOCK_DGRAM then 'addr' is the address
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* to which datagrams are sent by default, and the only address from which
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* 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
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* that is bound to the address specified by 'addr'.
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*
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* Generally, connection-based protocol sockets may successfully connect()
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* only once; connectionless protocol sockets may use connect() multiple
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* times to change their association. Connectionless sockets may dissolve
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* the association by connecting to an address with the sa_family member of
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* sockaddr set to AF_UNSPEC.
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*
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* Parameters:
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* psock Pointer to a socket structure initialized by psock_socket()
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* addr Server address (form depends on type of socket)
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* addrlen Length of actual 'addr'
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*
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* Returned Value:
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* 0 on success; -1 on error with errno set appropriately
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*
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* EACCES, EPERM
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* The user tried to connect to a broadcast address without having the
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* socket broadcast flag enabled or the connection request failed
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* because of a local firewall rule.
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* EADDRINUSE
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* Local address is already in use.
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* EAFNOSUPPORT
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* The passed address didn't have the correct address family in its
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* sa_family field.
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* EAGAIN
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* No more free local ports or insufficient entries in the routing
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* cache.
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* EALREADY
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* The socket is non-blocking and a previous connection attempt has
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* not yet been completed.
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* EBADF
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* The file descriptor is not a valid index in the descriptor table.
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* ECONNREFUSED
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* No one listening on the remote address.
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* EFAULT
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* The socket structure address is outside the user's address space.
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* EINPROGRESS
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* The socket is non-blocking and the connection cannot be completed
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* immediately.
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* EINTR
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* The system call was interrupted by a signal that was caught.
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* EISCONN
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* The socket is already connected.
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* ENETUNREACH
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* Network is unreachable.
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* ENOTSOCK
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* The file descriptor is not associated with a socket.
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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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* Assumptions:
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*
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****************************************************************************/
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int psock_connect(FAR struct socket *psock, FAR const struct sockaddr *addr,
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socklen_t addrlen)
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{
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#if defined(CONFIG_NET_TCP) || defined(CONFIG_NET_UDP)
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#ifdef CONFIG_NET_IPv6
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FAR const struct sockaddr_in6 *inaddr = (const struct sockaddr_in6 *)addr;
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#else
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FAR const struct sockaddr_in *inaddr = (const struct sockaddr_in *)addr;
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#endif
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int ret;
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#endif
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int err;
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/* Verify that the psock corresponds to valid, allocated socket */
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if (!psock || psock->s_crefs <= 0)
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{
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err = EBADF;
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goto errout;
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}
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/* Verify that a valid address has been provided */
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#ifdef CONFIG_NET_IPv6
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if (addr->sa_family != AF_INET6 || addrlen < sizeof(struct sockaddr_in6))
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#else
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if (addr->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in))
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#endif
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{
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err = EBADF;
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goto errout;
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}
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/* Perform the connection depending on the protocol type */
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switch (psock->s_type)
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{
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#ifdef CONFIG_NET_TCP
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case SOCK_STREAM:
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{
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/* Verify that the socket is not already connected */
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if (_SS_ISCONNECTED(psock->s_flags))
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{
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err = EISCONN;
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goto errout;
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}
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/* Its not ... connect it */
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ret = psock_tcp_connect(psock, inaddr);
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if (ret < 0)
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{
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err = -ret;
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goto errout;
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}
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}
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break;
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#endif
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#ifdef CONFIG_NET_UDP
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case SOCK_DGRAM:
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{
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ret = udp_connect(psock->s_conn, inaddr);
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if (ret < 0)
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{
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err = -ret;
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goto errout;
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}
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}
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break;
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#endif
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default:
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err = EBADF;
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goto errout;
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}
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return OK;
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errout:
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errno = err;
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return ERROR;
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}
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/****************************************************************************
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* Name: connect
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*
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* Description:
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* connect() connects the socket referred to by the file descriptor 'sockfd'
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* to the address specified by 'addr'. The addrlen argument specifies
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* the size of 'addr'. The format of the address in 'addr' is
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|
* determined by the address space of the socket 'sockfd'.
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|
*
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* If the socket 'sockfd' is of type SOCK_DGRAM then 'addr' is the address
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|
* to which datagrams are sent by default, and the only address from which
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* 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
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|
* that is bound to the address specified by 'addr'.
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|
*
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|
* Generally, connection-based protocol sockets may successfully connect()
|
|
* only once; connectionless protocol sockets may use connect() multiple
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|
* times to change their association. Connectionless sockets may dissolve
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* the association by connecting to an address with the sa_family member of
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* sockaddr set to AF_UNSPEC.
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*
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* Parameters:
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* sockfd Socket descriptor returned by socket()
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* addr Server address (form depends on type of socket)
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* addrlen Length of actual 'addr'
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*
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* Returned Value:
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* 0 on success; -1 on error with errno set appropriately
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*
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* EACCES, EPERM
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* The user tried to connect to a broadcast address without having the
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|
* socket broadcast flag enabled or the connection request failed
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* because of a local firewall rule.
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* EADDRINUSE
|
|
* Local address is already in use.
|
|
* EAFNOSUPPORT
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|
* The passed address didn't have the correct address family in its
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* sa_family field.
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* EAGAIN
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* No more free local ports or insufficient entries in the routing
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* cache.
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* EALREADY
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|
* The socket is non-blocking and a previous connection attempt has
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* not yet been completed.
|
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* 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)
|
|
{
|
|
/* Get the underlying socket structure */
|
|
|
|
FAR struct socket *psock = sockfd_socket(sockfd);
|
|
|
|
/* Then let psock_connect() do all of the work */
|
|
|
|
return psock_connect(psock, addr, addrlen);
|
|
}
|
|
|
|
#endif /* CONFIG_NET */
|