ea50c50b47
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@442 42af7a65-404d-4744-a932-0658087f49c3
399 lines
12 KiB
C
399 lines
12 KiB
C
/****************************************************************************
|
|
* net/accept.c
|
|
*
|
|
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* 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>
|
|
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 && defined(CONFIG_NET_TCP)
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <semaphore.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <arch/irq.h>
|
|
|
|
#include "net-internal.h"
|
|
|
|
/****************************************************************************
|
|
* Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
struct accept_s
|
|
{
|
|
sem_t acpt_sem; /* Wait for interrupt event */
|
|
#ifdef CONFIG_NET_IPv6
|
|
FAR struct sockaddr_in6 *acpt_addr; /* Return connection adress */
|
|
#else
|
|
FAR struct sockaddr_in *acpt_addr; /* Return connection adress */
|
|
#endif
|
|
FAR struct uip_conn *acpt_newconn; /* The accepted connection */
|
|
int acpt_result; /* The result of the wait */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: accept_tcpsender
|
|
*
|
|
* Description:
|
|
* Getting the sender's address from the UDP packet
|
|
*
|
|
* Parameters:
|
|
* conn - The newly accepted TCP connection
|
|
* pstate - the recvfrom state structure
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Running at the interrupt level
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_NET_TCP
|
|
static inline void accept_tcpsender(struct uip_conn *conn, struct accept_s *pstate)
|
|
{
|
|
#ifdef CONFIG_NET_IPv6
|
|
FAR struct sockaddr_in6 *addr = pstate->acpt_addr;
|
|
#else
|
|
FAR struct sockaddr_in *addr = pstate->acpt_addr;
|
|
#endif
|
|
|
|
if (addr)
|
|
{
|
|
addr->sin_family = AF_INET;
|
|
addr->sin_port = conn->rport;
|
|
uip_ipaddr_copy(addr->sin_addr.s_addr, conn->ripaddr);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Function: accept_interrupt
|
|
*
|
|
* Description:
|
|
* Receive interrupt level callbacks when connections occur
|
|
*
|
|
* Parameters:
|
|
* listener The conection stucture of the listener
|
|
* conn The connection stucture that was just accepted
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Running at the interrupt level
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int accept_interrupt(struct uip_conn *listener, struct uip_conn *conn)
|
|
{
|
|
struct accept_s *pstate = (struct accept_s *)listener->accept_private;
|
|
int ret = -EINVAL;
|
|
|
|
if (pstate)
|
|
{
|
|
/* Get the connection address */
|
|
|
|
accept_tcpsender(conn, pstate);
|
|
|
|
/* Save the connection structure */
|
|
|
|
pstate->acpt_newconn = conn;
|
|
pstate->acpt_result = OK;
|
|
sem_post(&pstate->acpt_sem);
|
|
|
|
/* Stop any further callbacks */
|
|
|
|
listener->accept_private = NULL;
|
|
listener->accept = NULL;
|
|
ret = OK;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: 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.
|
|
*
|
|
* Parameters:
|
|
* sockfd The listening socket descriptior
|
|
* 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.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
****************************************************************************/
|
|
|
|
int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen)
|
|
{
|
|
FAR struct socket *psock = sockfd_socket(sockfd);
|
|
FAR struct socket *pnewsock;
|
|
FAR struct uip_conn *conn;
|
|
struct accept_s state;
|
|
#ifdef CONFIG_NET_IPv6
|
|
FAR struct sockaddr_in6 *inaddr = (struct sockaddr_in6 *)addr;
|
|
#else
|
|
FAR struct sockaddr_in *inaddr = (struct sockaddr_in *)addr;
|
|
#endif
|
|
irqstate_t save;
|
|
int newfd;
|
|
int err;
|
|
int ret;
|
|
|
|
/* Verify that the sockfd corresponds to valid, allocated socket */
|
|
|
|
if (!psock || 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 CONFIG_NFILE_DESCRIPTORS > 0
|
|
if ((unsigned int)sockfd < CONFIG_NFILE_DESCRIPTORS)
|
|
{
|
|
err = ENOTSOCK;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
err = EBADF;
|
|
}
|
|
goto errout;
|
|
}
|
|
|
|
/* We have a socket descriptor, but it is a stream? */
|
|
|
|
if (psock->s_type != SOCK_STREAM)
|
|
{
|
|
err = EOPNOTSUPP;
|
|
goto errout;
|
|
}
|
|
|
|
/* Is the socket listening for a connection? */
|
|
|
|
if (!_SS_ISLISTENING(psock->s_flags))
|
|
{
|
|
err = EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
/* Verify that a valid memory block has been provided to receive the address address */
|
|
|
|
#ifdef CONFIG_NET_IPv6
|
|
if (addr->sa_family != AF_INET6 || *addrlen < sizeof(struct sockaddr_in6))
|
|
#else
|
|
if (addr->sa_family != AF_INET || *addrlen < sizeof(struct sockaddr_in))
|
|
#endif
|
|
{
|
|
err = EBADF;
|
|
goto errout;
|
|
}
|
|
|
|
/* Allocate a socket descriptor for the new connection now (so that it cannot fail later) */
|
|
|
|
newfd = sockfd_allocate();
|
|
if (newfd < 0)
|
|
{
|
|
err = ENFILE;
|
|
goto errout;
|
|
}
|
|
|
|
pnewsock = sockfd_socket(newfd);
|
|
if (!pnewsock)
|
|
{
|
|
err = ENFILE;
|
|
goto errout_with_socket;
|
|
}
|
|
|
|
/* Set the socket state to accepting */
|
|
|
|
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_ACCEPT);
|
|
|
|
/* Perform the TCP accept operation */
|
|
|
|
/* Initialize the state structure. This is done with interrupts
|
|
* disabled because we don't want anything to happen until we
|
|
* are ready.
|
|
*/
|
|
|
|
save = irqsave();
|
|
state.acpt_addr = inaddr;
|
|
state.acpt_newconn = NULL;
|
|
state.acpt_result = OK;
|
|
sem_init(&state.acpt_sem, 0, 0);
|
|
|
|
/* Set up the callback in the connection */
|
|
|
|
conn = (struct uip_conn *)psock->s_conn;
|
|
conn->accept_private = (void*)&state;
|
|
conn->accept = accept_interrupt;
|
|
|
|
/* Wait for the send to complete or an error to occur: NOTES: (1)
|
|
* sem_wait will also terminate if a signal is received, (2) interrupts
|
|
* are disabled! They will be re-enabled while the task sleeps and
|
|
* automatically re-enabled when the task restarts.
|
|
*/
|
|
|
|
ret = sem_wait(&state.acpt_sem);
|
|
|
|
/* Make sure that no further interrupts are processed */
|
|
|
|
conn->accept_private = NULL;
|
|
conn->accept = NULL;
|
|
|
|
sem_destroy(&state. acpt_sem);
|
|
irqrestore(save);
|
|
|
|
/* Set the socket state to idle */
|
|
|
|
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
|
|
|
|
/* Check for a errors. Errors are signaled by negative errno values
|
|
* for the send length
|
|
*/
|
|
|
|
if (state.acpt_result != 0)
|
|
{
|
|
err = state.acpt_result;
|
|
goto errout_with_socket;
|
|
}
|
|
|
|
/* If sem_wait failed, then we were probably reawakened by a signal. In
|
|
* this case, sem_wait will have set errno appropriately.
|
|
*/
|
|
|
|
if (ret < 0)
|
|
{
|
|
err = -ret;
|
|
goto errout_with_socket;
|
|
}
|
|
|
|
/* Initialize the socket structure and mark the socket as connected */
|
|
|
|
pnewsock->s_type = SOCK_STREAM;
|
|
pnewsock->s_conn = state.acpt_newconn;
|
|
pnewsock->s_flags |= _SF_CONNECTED;
|
|
return newfd;
|
|
|
|
errout_with_socket:
|
|
sockfd_release(newfd);
|
|
|
|
errout:
|
|
*get_errno_ptr() = err;
|
|
return ERROR;
|
|
}
|
|
|
|
#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS && CONFIG_NET_TCP */
|