bb45db5b2e
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1452 42af7a65-404d-4744-a932-0658087f49c3
427 lines
13 KiB
C
427 lines
13 KiB
C
/****************************************************************************
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* net/accept.c
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*
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* Copyright (C) 2007, 2008 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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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 && defined(CONFIG_NET_TCP)
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <semaphore.h>
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#include <string.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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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct accept_s
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{
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sem_t acpt_sem; /* Wait for interrupt event */
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#ifdef CONFIG_NET_IPv6
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FAR struct sockaddr_in6 *acpt_addr; /* Return connection adress */
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#else
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FAR struct sockaddr_in *acpt_addr; /* Return connection adress */
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#endif
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FAR struct uip_conn *acpt_newconn; /* The accepted connection */
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int acpt_result; /* The result of the wait */
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: accept_tcpsender
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*
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* Description:
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* Getting the sender's address from the UDP packet
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*
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* Parameters:
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* conn - The newly accepted TCP connection
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* pstate - the recvfrom state structure
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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 void accept_tcpsender(FAR struct uip_conn *conn,
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FAR struct sockaddr_in6 *addr)
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#else
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static inline void accept_tcpsender(FAR struct uip_conn *conn,
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FAR struct sockaddr_in *addr)
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#endif
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{
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if (addr)
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{
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addr->sin_family = AF_INET;
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addr->sin_port = conn->rport;
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uip_ipaddr_copy(addr->sin_addr.s_addr, conn->ripaddr);
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}
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}
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#endif
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/****************************************************************************
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* Function: accept_interrupt
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*
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* Description:
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* Receive interrupt level callbacks when connections occur
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*
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* Parameters:
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* listener The conection stucture of the listener
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* conn The connection stucture that was just accepted
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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 int accept_interrupt(struct uip_conn *listener, struct uip_conn *conn)
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{
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struct accept_s *pstate = (struct accept_s *)listener->accept_private;
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int ret = -EINVAL;
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if (pstate)
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{
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/* Get the connection address */
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accept_tcpsender(conn, pstate->acpt_addr);
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/* Save the connection structure */
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pstate->acpt_newconn = conn;
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pstate->acpt_result = OK;
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sem_post(&pstate->acpt_sem);
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/* Stop any further callbacks */
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listener->accept_private = NULL;
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listener->accept = NULL;
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ret = OK;
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}
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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: accept
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*
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* Description:
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* The accept function is used with connection-based socket types
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* (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first
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* connection request on the queue of pending connections, creates a new
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* connected socket with mostly the same properties as 'sockfd', and
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* allocates a new socket descriptor for the socket, which is returned. The
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* newly created socket is no longer in the listening state. The original
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* socket 'sockfd' is unaffected by this call. Per file descriptor flags
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* are not inherited across an accept.
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*
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* The 'sockfd' argument is a socket descriptor that has been created with
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* socket(), bound to a local address with bind(), and is listening for
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* connections after a call to listen().
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*
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* On return, the 'addr' structure is filled in with the address of the
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* connecting entity. The 'addrlen' argument initially contains the size
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* of the structure pointed to by 'addr'; on return it will contain the
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* actual length of the address returned.
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*
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* If no pending connections are present on the queue, and the socket is
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* not marked as non-blocking, accept blocks the caller until a connection
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* is present. If the socket is marked non-blocking and no pending
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* connections are present on the queue, accept returns EAGAIN.
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*
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* Parameters:
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* sockfd The listening socket descriptior
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* addr Receives the address of the connecting client
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* addrlen Input: allocated size of 'addr', Return: returned size of 'addr'
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*
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* Returned Value:
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* Returns -1 on error. If it succeeds, it returns a non-negative integer
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* that is a descriptor for the accepted socket.
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*
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* EAGAIN or EWOULDBLOCK
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* The socket is marked non-blocking and no connections are present to
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* be accepted.
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* EBADF
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* The descriptor is invalid.
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* ENOTSOCK
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* The descriptor references a file, not a socket.
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* EOPNOTSUPP
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* The referenced socket is not of type SOCK_STREAM.
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* EINTR
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* The system call was interrupted by a signal that was caught before
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* a valid connection arrived.
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* ECONNABORTED
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* A connection has been aborted.
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* EINVAL
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* Socket is not listening for connections.
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* EMFILE
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* The per-process limit of open file descriptors has been reached.
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* ENFILE
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* The system maximum for file descriptors has been reached.
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* EFAULT
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* The addr parameter is not in a writable part of the user address
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* space.
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* ENOBUFS or ENOMEM
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* Not enough free memory.
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* EPROTO
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* Protocol error.
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* EPERM
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* Firewall rules forbid connection.
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*
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* Assumptions:
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*
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****************************************************************************/
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int accept(int sockfd, 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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FAR struct socket *pnewsock;
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FAR struct uip_conn *conn;
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struct accept_s state;
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#ifdef CONFIG_NET_IPv6
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FAR struct sockaddr_in6 *inaddr = (struct sockaddr_in6 *)addr;
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#else
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FAR struct sockaddr_in *inaddr = (struct sockaddr_in *)addr;
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#endif
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irqstate_t save;
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int newfd;
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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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/* It is not a valid socket description. Distinguish between the cases
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* where sockfd is a just valid and when it is a valid file descriptor used
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* in the wrong context.
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*/
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#if CONFIG_NFILE_DESCRIPTORS > 0
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if ((unsigned int)sockfd < CONFIG_NFILE_DESCRIPTORS)
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{
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err = ENOTSOCK;
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}
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else
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#endif
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{
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err = EBADF;
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}
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goto errout;
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}
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/* We have a socket descriptor, but it is a stream? */
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if (psock->s_type != SOCK_STREAM)
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{
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err = EOPNOTSUPP;
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goto errout;
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}
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/* Is the socket listening for a connection? */
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if (!_SS_ISLISTENING(psock->s_flags))
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{
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err = EINVAL;
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goto errout;
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}
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/* Verify that a valid memory block has been provided to receive
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* the address
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*/
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if (addr)
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{
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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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}
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/* Allocate a socket descriptor for the new connection now
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* (so that it cannot fail later)
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*/
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newfd = sockfd_allocate();
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if (newfd < 0)
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{
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err = ENFILE;
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goto errout;
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}
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pnewsock = sockfd_socket(newfd);
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if (!pnewsock)
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{
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err = ENFILE;
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goto errout_with_socket;
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}
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/* Check the backlog to see if there is a connection already pending
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* for this listener.
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*/
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save = irqsave();
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conn = (struct uip_conn *)psock->s_conn;
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#ifdef CONFIG_NET_TCPBACKLOG
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state.acpt_newconn = uip_backlogremove(conn);
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if (state.acpt_newconn)
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{
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/* Yes... get the address of the connected client */
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nvdbg("Pending conn=%p\n", state.acpt_newconn);
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accept_tcpsender(state.acpt_newconn, inaddr);
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}
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else
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#endif
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{
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/* Set the socket state to accepting */
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psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_ACCEPT);
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/* Perform the TCP accept operation */
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/* Initialize the state structure. This is done with interrupts
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* disabled because we don't want anything to happen until we
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* are ready.
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*/
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state.acpt_addr = inaddr;
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state.acpt_newconn = NULL;
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state.acpt_result = OK;
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sem_init(&state.acpt_sem, 0, 0);
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/* Set up the callback in the connection */
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conn->accept_private = (void*)&state;
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conn->accept = accept_interrupt;
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/* Wait for the send to complete or an error to occur: NOTES: (1)
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* sem_wait will also terminate if a signal is received, (2) interrupts
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* are disabled! They will be re-enabled while the task sleeps and
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* automatically re-enabled when the task restarts.
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*/
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ret = sem_wait(&state.acpt_sem);
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/* Make sure that no further interrupts are processed */
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conn->accept_private = NULL;
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conn->accept = NULL;
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sem_destroy(&state. acpt_sem);
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/* Set the socket state to idle */
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psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
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/* Check for a errors. Errors are signaled by negative errno values
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* for the send length
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*/
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if (state.acpt_result != 0)
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{
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err = state.acpt_result;
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goto errout_with_irq;
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}
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/* If sem_wait failed, then we were probably reawakened by a signal. In
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* this case, sem_wait will have set errno appropriately.
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*/
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if (ret < 0)
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{
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err = -ret;
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goto errout_with_irq;
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}
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}
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irqrestore(save);
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/* Initialize the socket structure and mark the socket as connected */
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pnewsock->s_type = SOCK_STREAM;
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pnewsock->s_conn = state.acpt_newconn;
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pnewsock->s_flags |= _SF_CONNECTED;
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return newfd;
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errout_with_irq:
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irqrestore(save);
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errout_with_socket:
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sockfd_release(newfd);
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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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#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS && CONFIG_NET_TCP */
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