6a3c2aded6
* Simplify EINTR/ECANCEL error handling 1. Add semaphore uninterruptible wait function 2 .Replace semaphore wait loop with a single uninterruptible wait 3. Replace all sem_xxx to nxsem_xxx * Unify the void cast usage 1. Remove void cast for function because many place ignore the returned value witout cast 2. Replace void cast for variable with UNUSED macro
309 lines
10 KiB
C
309 lines
10 KiB
C
/****************************************************************************
|
|
* net/socket/accept.c
|
|
*
|
|
* Copyright (C) 2007-2012, 2015-2017 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/cancelpt.h>
|
|
#include <arch/irq.h>
|
|
|
|
#include "socket/socket.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: psock_accept
|
|
*
|
|
* Description:
|
|
* The psock_accept function is used with connection-based socket types
|
|
* (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first
|
|
* connection request on the queue of pending connections, creates a new
|
|
* connected socket with mostly the same properties as 'sockfd', and
|
|
* allocates a new socket descriptor for the socket, which is returned. The
|
|
* newly created socket is no longer in the listening state. The original
|
|
* socket 'sockfd' is unaffected by this call. Per file descriptor flags
|
|
* are not inherited across an psock_accept.
|
|
*
|
|
* The 'sockfd' argument is a socket descriptor that has been created with
|
|
* socket(), bound to a local address with bind(), and is listening for
|
|
* connections after a call to listen().
|
|
*
|
|
* On return, the 'addr' structure is filled in with the address of the
|
|
* connecting entity. The 'addrlen' argument initially contains the size
|
|
* of the structure pointed to by 'addr'; on return it will contain the
|
|
* actual length of the address returned.
|
|
*
|
|
* If no pending connections are present on the queue, and the socket is
|
|
* not marked as non-blocking, psock_accept blocks the caller until a
|
|
* connection is present. If the socket is marked non-blocking and no
|
|
* pending connections are present on the queue, psock_accept returns
|
|
* EAGAIN.
|
|
*
|
|
* Input Parameters:
|
|
* psock Reference to the listening socket structure
|
|
* addr Receives the address of the connecting client
|
|
* addrlen Input: allocated size of 'addr', Return: returned size of 'addr'
|
|
* newsock Location to return the accepted socket information.
|
|
*
|
|
* Returned Value:
|
|
* Returns 0 (OK) on success. On failure, it returns a negated errno value
|
|
* to indicate the nature of the error.
|
|
*
|
|
* EAGAIN or EWOULDBLOCK
|
|
* The socket is marked non-blocking and no connections are present to
|
|
* be accepted.
|
|
* EOPNOTSUPP
|
|
* The referenced socket is not of type SOCK_STREAM.
|
|
* EINTR
|
|
* The system call was interrupted by a signal that was caught before
|
|
* a valid connection arrived.
|
|
* ECONNABORTED
|
|
* A connection has been aborted.
|
|
* EINVAL
|
|
* Socket is not listening for connections.
|
|
* EMFILE
|
|
* The per-process limit of open file descriptors has been reached.
|
|
* ENFILE
|
|
* The system maximum for file descriptors has been reached.
|
|
* EFAULT
|
|
* The addr parameter is not in a writable part of the user address space.
|
|
* ENOBUFS or ENOMEM
|
|
* Not enough free memory.
|
|
* EPROTO
|
|
* Protocol error.
|
|
* EPERM
|
|
* Firewall rules forbid connection.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int psock_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
|
|
FAR socklen_t *addrlen, FAR struct socket *newsock)
|
|
{
|
|
int ret;
|
|
|
|
DEBUGASSERT(psock != NULL && psock->s_conn != NULL && newsock != NULL);
|
|
|
|
/* May sure that the socket has been opened with socket() */
|
|
|
|
if (psock == NULL || psock->s_conn == NULL)
|
|
{
|
|
nerr("ERROR: Socket invalid or not opened\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Is the socket listening for a connection? */
|
|
|
|
if (!_SS_ISLISTENING(psock->s_flags))
|
|
{
|
|
nerr("ERROR: Socket is not listening for a connection.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Let the address family's accept() method handle the operation */
|
|
|
|
DEBUGASSERT(psock->s_sockif != NULL && psock->s_sockif->si_accept != NULL);
|
|
|
|
net_lock();
|
|
ret = psock->s_sockif->si_accept(psock, addr, addrlen, newsock);
|
|
if (ret < 0)
|
|
{
|
|
nerr("ERROR: si_accept failed: %d\n", ret);
|
|
goto errout_with_lock;
|
|
}
|
|
|
|
/* Mark the new socket as connected. */
|
|
|
|
newsock->s_flags |= _SF_CONNECTED;
|
|
newsock->s_flags &= ~_SF_CLOSED;
|
|
|
|
ret = OK;
|
|
|
|
errout_with_lock:
|
|
net_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: accept
|
|
*
|
|
* Description:
|
|
* The accept function is used with connection-based socket types
|
|
* (SOCK_STREAM, SOCK_SEQPACKET and SOCK_RDM). It extracts the first
|
|
* connection request on the queue of pending connections, creates a new
|
|
* connected socket with mostly the same properties as 'sockfd', and
|
|
* allocates a new socket descriptor for the socket, which is returned. The
|
|
* newly created socket is no longer in the listening state. The original
|
|
* socket 'sockfd' is unaffected by this call. Per file descriptor flags
|
|
* are not inherited across an accept.
|
|
*
|
|
* The 'sockfd' argument is a socket descriptor that has been created with
|
|
* socket(), bound to a local address with bind(), and is listening for
|
|
* connections after a call to listen().
|
|
*
|
|
* On return, the 'addr' structure is filled in with the address of the
|
|
* connecting entity. The 'addrlen' argument initially contains the size
|
|
* of the structure pointed to by 'addr'; on return it will contain the
|
|
* actual length of the address returned.
|
|
*
|
|
* If no pending connections are present on the queue, and the socket is
|
|
* not marked as non-blocking, accept blocks the caller until a connection
|
|
* is present. If the socket is marked non-blocking and no pending
|
|
* connections are present on the queue, accept returns EAGAIN.
|
|
*
|
|
* Input Parameters:
|
|
* sockfd The listening socket descriptor
|
|
* addr Receives the address of the connecting client
|
|
* addrlen Input: allocated size of 'addr', Return: returned size of 'addr'
|
|
*
|
|
* Returned Value:
|
|
* Returns -1 on error. If it succeeds, it returns a non-negative integer
|
|
* that is a descriptor for the accepted socket.
|
|
*
|
|
* EAGAIN or EWOULDBLOCK
|
|
* The socket is marked non-blocking and no connections are present to
|
|
* be accepted.
|
|
* EBADF
|
|
* The descriptor is invalid.
|
|
* ENOTSOCK
|
|
* The descriptor references a file, not a socket.
|
|
* EOPNOTSUPP
|
|
* The referenced socket is not of type SOCK_STREAM.
|
|
* EINTR
|
|
* The system call was interrupted by a signal that was caught before
|
|
* a valid connection arrived.
|
|
* ECONNABORTED
|
|
* A connection has been aborted.
|
|
* EINVAL
|
|
* Socket is not listening for connections.
|
|
* EMFILE
|
|
* The per-process limit of open file descriptors has been reached.
|
|
* ENFILE
|
|
* The system maximum for file descriptors has been reached.
|
|
* EFAULT
|
|
* The addr parameter is not in a writable part of the user address
|
|
* space.
|
|
* ENOBUFS or ENOMEM
|
|
* Not enough free memory.
|
|
* EPROTO
|
|
* Protocol error.
|
|
* EPERM
|
|
* Firewall rules forbid connection.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int accept(int sockfd, FAR struct sockaddr *addr, FAR socklen_t *addrlen)
|
|
{
|
|
FAR struct socket *psock = sockfd_socket(sockfd);
|
|
FAR struct socket *newsock;
|
|
int newfd;
|
|
int errcode;
|
|
int ret;
|
|
|
|
/* accept() is a cancellation point */
|
|
|
|
enter_cancellation_point();
|
|
|
|
/* Verify that the sockfd corresponds to valid, allocated socket */
|
|
|
|
if (psock == NULL || psock->s_crefs <= 0)
|
|
{
|
|
/* It is not a valid socket description. Distinguish between the cases
|
|
* where sockfd is a just valid and when it is a valid file descriptor used
|
|
* in the wrong context.
|
|
*/
|
|
|
|
if ((unsigned int)sockfd < CONFIG_NFILE_DESCRIPTORS)
|
|
{
|
|
errcode = ENOTSOCK;
|
|
}
|
|
else
|
|
{
|
|
errcode = EBADF;
|
|
}
|
|
|
|
goto errout;
|
|
}
|
|
|
|
/* Allocate a socket descriptor for the new connection now (so that it
|
|
* cannot fail later)
|
|
*/
|
|
|
|
newfd = sockfd_allocate(0);
|
|
if (newfd < 0)
|
|
{
|
|
errcode = ENFILE;
|
|
goto errout;
|
|
}
|
|
|
|
newsock = sockfd_socket(newfd);
|
|
if (newsock == NULL)
|
|
{
|
|
errcode = ENFILE;
|
|
goto errout_with_socket;
|
|
}
|
|
|
|
ret = psock_accept(psock, addr, addrlen, newsock);
|
|
if (ret < 0)
|
|
{
|
|
errcode = -ret;
|
|
goto errout_with_socket;
|
|
}
|
|
|
|
leave_cancellation_point();
|
|
return newfd;
|
|
|
|
errout_with_socket:
|
|
sockfd_release(newfd);
|
|
|
|
errout:
|
|
leave_cancellation_point();
|
|
|
|
_SO_SETERRNO(psock, errcode);
|
|
return ERROR;
|
|
}
|
|
|