44778c69bd
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@371 42af7a65-404d-4744-a932-0658087f49c3
521 lines
16 KiB
C
521 lines
16 KiB
C
/****************************************************************************
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* net/connect.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 <errno.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include "net-internal.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct tcp_connect_s
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{
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FAR struct uip_conn *tc_conn; /* Reference to TCP connection structure */
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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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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static void connection_event(void *private);
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static inline void tcp_setup_callbacks(struct uip_conn *conn, FAR struct socket *psock,
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FAR struct tcp_connect_s *pstate);
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static inline void tcp_teardown_callbacks(struct uip_conn *conn, int status);
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static void tcp_connect_interrupt(struct uip_driver_s *dev, void *private);
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#ifdef CONFIG_NET_IPv6
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static inline int tcp_connect(FAR struct socket *psock, const struct sockaddr_in6 *inaddr);
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#else
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static inline int tcp_connect(FAR struct socket *psock, const struct sockaddr_in *inaddr);
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: connection_event
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*
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* Description:
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* Some connection related event has occurred
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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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* private An instance of struct recvfrom_s cast to void*
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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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static void connection_event(void *private)
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{
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FAR struct socket *psock = (FAR struct socket *)private;
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if (psock)
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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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* UIP_TIMEDOUT: Connection aborted due to too many retransmissions.
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*/
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if ((uip_flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
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{
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/* Indicate that the socket is no longer connected */
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psock->s_flags &= ~_SF_CONNECTED;
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}
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/* UIP_CONNECTED: The socket is successfully connected */
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else if ((uip_flags & UIP_CONNECTED) != 0)
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{
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/* Indicate that the socket is now connected */
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psock->s_flags |= _SF_CONNECTED;
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}
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}
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}
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/****************************************************************************
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* Function: tcp_setup_callbacks
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****************************************************************************/
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static inline void tcp_setup_callbacks(struct uip_conn *conn, FAR struct socket *psock,
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FAR struct tcp_connect_s *pstate)
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{
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/* Set up the callbacks in the connection */
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conn->data_private = (void*)pstate;
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conn->data_event = tcp_connect_interrupt;
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/* Set up to receive callbacks on connection-related events */
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conn->connection_private = (void*)psock;
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conn->connection_event = connection_event;
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}
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/****************************************************************************
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* Function: tcp_teardown_callbacks
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****************************************************************************/
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static inline void tcp_teardown_callbacks(struct uip_conn *conn, int status)
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{
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/* Make sure that no further interrupts are processed */
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conn->data_private = NULL;
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conn->data_event = NULL;
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/* If we successfully connected, we will continue to monitor the connection state
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* via callbacks.
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*/
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if (status < 0)
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{
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/* Failed to connect */
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conn->connection_private = NULL;
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conn->connection_event = NULL;
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}
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}
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/****************************************************************************
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* Function: tcp_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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* private An instance of struct recvfrom_s cast to void*
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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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static void tcp_connect_interrupt(struct uip_driver_s *dev, void *private)
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{
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struct tcp_connect_s *pstate = (struct tcp_connect_s *)private;
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vdbg("Interrupt uip_flags=%02x\n", uip_flags);
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/* 'private' 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 ((uip_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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vdbg("ECONNREFUSED\n");
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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 ((uip_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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vdbg("ETIMEDOUT\n");
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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 ((uip_flags & UIP_CONNECTED) != 0)
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{
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/* Indicate that the socket is no longer connected */
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vdbg("Connected\n");
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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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return;
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}
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/* Stop further callbacks */
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tcp_teardown_callbacks(pstate->tc_conn, 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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}
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/****************************************************************************
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* Function: 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_IPv6
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static inline int tcp_connect(FAR struct socket *psock, const struct sockaddr_in6 *inaddr)
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#else
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static inline int tcp_connect(FAR struct socket *psock, const struct sockaddr_in *inaddr)
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#endif
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{
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FAR struct uip_conn *conn;
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struct tcp_connect_s state;
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irqstate_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 = irqsave();
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/* Get the connection reference from the socket */
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conn = psock->s_conn;
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if (!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 = uip_tcpconnect(conn, inaddr);
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}
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if (ret >= 0)
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{
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/* Initialize the TCP state structure */
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(void)sem_init(&state.tc_sem, 0, 0); /* Doesn't really fail */
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state.tc_conn = conn;
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state.tc_result = -EAGAIN;
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/* Set up the callbacks in the connection */
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tcp_setup_callbacks(conn, psock, &state);
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/* Wait for either the connect to complete or for an error/timeout to occur.
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* NOTES: (1) sem_wait will also terminate if a signal is received, (2)
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* interrupts are disabled! They will be re-enabled while the task sleeps
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* and automatically re-enabled when the task restarts.
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*/
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ret = sem_wait(&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 sem_wait failed, recover the negated error (probably -EINTR) */
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if (ret < 0)
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{
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int err = *get_errno_ptr();
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if (err >= 0)
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{
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err = ENOSYS;
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}
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ret = -err;
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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 the state structure */
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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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tcp_teardown_callbacks(conn, ret);
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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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irqrestore(flags);
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return ret;
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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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* Function: 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()
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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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* 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
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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 connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen)
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{
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FAR struct socket *psock = sockfd_socket(sockfd);
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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 err;
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int ret;
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/* Verify that the sockfd 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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case SOCK_STREAM:
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{
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dbg("TCP\n");
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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 = 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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#ifdef CONFIG_NET_UDP
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case SOCK_DGRAM:
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{
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dbg("UDP\n");
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ret = uip_udpconnect(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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*get_errno_ptr() = err;
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return ERROR;
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}
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#endif /* CONFIG_NET */
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