451 lines
13 KiB
C
451 lines
13 KiB
C
/****************************************************************************
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* net/socket/accept.c
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*
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* Copyright (C) 2007-2012, 2015-2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 && \
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(defined(CONFIG_NET_TCP) || defined(CONFIG_NET_LOCAL_STREAM))
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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 <assert.h>
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#include <debug.h>
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#include <nuttx/cancelpt.h>
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#include <arch/irq.h>
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#include "tcp/tcp.h"
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#include "local/local.h"
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#include "socket/socket.h"
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#include "usrsock/usrsock.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_accept
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*
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* Description:
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* The psock_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 psock_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, psock_accept blocks the caller until a
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* connection is present. If the socket is marked non-blocking and no
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* pending connections are present on the queue, psock_accept returns
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* EAGAIN.
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*
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* Parameters:
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* psock Reference to the listening socket structure
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* addr Receives the address of the connecting client
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* addrlen Input: allocated size of 'addr', Return: returned size of 'addr'
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* newsock Location to return the accepted socket information.
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*
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* Returned Value:
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* Returns 0 (OK) on success. On failure, it returns -1 (ERROR) with the
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* errno variable set to indicate the nature of the error.
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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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* 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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****************************************************************************/
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int psock_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
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FAR socklen_t *addrlen, FAR struct socket *newsock)
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{
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int errcode;
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#if defined(NET_TCP_HAVE_STACK) || defined(CONFIG_NET_LOCAL_STREAM)
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int ret;
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#endif
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DEBUGASSERT(psock != NULL);
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/* Treat as a cancellation point */
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(void)enter_cancellation_point();
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/* Is the socket a stream? */
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if (psock->s_type != SOCK_STREAM)
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{
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#ifdef CONFIG_NET_USRSOCK
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if (psock->s_type == SOCK_USRSOCK_TYPE)
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{
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#warning "Missing logic"
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}
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#endif
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errcode = 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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errcode = 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 the
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* address
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*/
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if (addr)
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{
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/* If an address is provided, then the length must also be provided. */
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DEBUGASSERT(addrlen);
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/* A valid length depends on the address domain */
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switch (psock->s_domain)
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{
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#ifdef CONFIG_NET_IPv4
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case PF_INET:
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{
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if (*addrlen < sizeof(struct sockaddr_in))
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{
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errcode = EBADF;
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goto errout;
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}
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}
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break;
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#endif /* CONFIG_NET_IPv4 */
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#ifdef CONFIG_NET_IPv6
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case PF_INET6:
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{
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if (*addrlen < sizeof(struct sockaddr_in6))
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{
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errcode = EBADF;
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goto errout;
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}
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}
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break;
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#endif /* CONFIG_NET_IPv6 */
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#ifdef CONFIG_NET_LOCAL_STREAM
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case PF_LOCAL:
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{
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if (*addrlen < sizeof(sa_family_t))
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{
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errcode = EBADF;
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goto errout;
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}
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}
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break;
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#endif /* CONFIG_NET_IPv6 */
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default:
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DEBUGPANIC();
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errcode = EINVAL;
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goto errout;
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}
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}
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/* Initialize the socket structure. */
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newsock->s_domain = psock->s_domain;
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newsock->s_type = SOCK_STREAM;
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/* Perform the correct accept operation for this address domain */
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#ifdef CONFIG_NET_LOCAL_STREAM
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#ifdef CONFIG_NET_TCP
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if (psock->s_domain == PF_LOCAL)
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#endif
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{
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/* Perform the local accept operation (with the network unlocked) */
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ret = psock_local_accept(psock, addr, addrlen, &newsock->s_conn);
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if (ret < 0)
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{
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errcode = -ret;
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goto errout;
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}
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}
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#endif /* CONFIG_NET_LOCAL_STREAM */
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#ifdef CONFIG_NET_TCP
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#ifdef CONFIG_NET_LOCAL_STREAM
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else
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#endif
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{
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#ifdef NET_TCP_HAVE_STACK
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/* Perform the local accept operation (with the network locked) */
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net_lock();
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ret = psock_tcp_accept(psock, addr, addrlen, &newsock->s_conn);
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if (ret < 0)
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{
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net_unlock();
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errcode = -ret;
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goto errout;
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}
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/* Begin monitoring for TCP connection events on the newly connected
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* socket
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*/
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ret = net_startmonitor(newsock);
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if (ret < 0)
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{
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/* net_startmonitor() can only fail on certain race conditions
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* where the connection was lost just before this function was
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* called. Undo everything we have done and return a failure.
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*/
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net_unlock();
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errcode = -ret;
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goto errout_after_accept;
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}
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net_unlock();
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#else
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errcode = EOPNOTSUPP;
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goto errout;
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#endif /* NET_TCP_HAVE_STACK */
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}
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#endif /* CONFIG_NET_TCP */
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/* Mark the new socket as connected. */
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newsock->s_flags |= _SF_CONNECTED;
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newsock->s_flags &= ~_SF_CLOSED;
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leave_cancellation_point();
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return OK;
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#ifdef NET_TCP_HAVE_STACK
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errout_after_accept:
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psock_close(newsock);
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#endif
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errout:
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set_errno(errcode);
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leave_cancellation_point();
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return ERROR;
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}
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/****************************************************************************
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* Name: 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 descriptor
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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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****************************************************************************/
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int accept(int sockfd, FAR struct sockaddr *addr, FAR 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 *newsock;
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int newfd;
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int errcode;
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int ret;
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/* accept() is a cancellation point */
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(void)enter_cancellation_point();
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (psock == NULL || 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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errcode = ENOTSOCK;
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}
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else
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#endif
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{
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errcode = EBADF;
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}
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goto errout;
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}
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/* Allocate a socket descriptor for the new connection now (so that it
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* cannot fail later)
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*/
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newfd = sockfd_allocate(0);
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if (newfd < 0)
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{
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errcode = ENFILE;
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goto errout;
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}
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newsock = sockfd_socket(newfd);
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if (newsock == NULL)
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{
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errcode = ENFILE;
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goto errout_with_socket;
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}
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ret = psock_accept(psock, addr, addrlen, newsock);
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if (ret < 0)
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{
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/* The errno value has already been set */
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sockfd_release(newfd);
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leave_cancellation_point();
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return ERROR;
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}
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leave_cancellation_point();
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return newfd;
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errout_with_socket:
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sockfd_release(newfd);
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errout:
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set_errno(errcode);
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leave_cancellation_point();
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return ERROR;
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}
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#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS && (CONFIG_NET_TCP || CONFIG_NET_LOCAL_STREAM) */
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