256 lines
9.1 KiB
C
256 lines
9.1 KiB
C
/****************************************************************************
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* net/socket/connect.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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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdint.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 <nuttx/net/net.h>
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#include "socket/socket.h"
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#ifdef CONFIG_NET
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_connect
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*
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* Description:
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* connect() connects the socket referred to by the structure 'psock'
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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 'psock'.
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*
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* If the socket 'psock' 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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* psock Pointer to a socket structure initialized by psock_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 psock_connect(FAR struct socket *psock, FAR const struct sockaddr *addr,
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socklen_t addrlen)
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{
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int errcode;
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int ret;
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/* Treat as a cancellation point */
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(void)enter_cancellation_point();
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/* Verify that the psock corresponds to valid, allocated socket */
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if (psock == NULL || psock->s_crefs <= 0)
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{
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errcode = EBADF;
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goto errout;
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}
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/* Let the address family's connect() method handle the operation */
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DEBUGASSERT(psock->s_sockif != NULL && psock->s_sockif->si_connect != NULL);
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ret = psock->s_sockif->si_connect(psock, addr, addrlen);
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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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leave_cancellation_point();
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return OK;
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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: 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, FAR const struct sockaddr *addr, socklen_t addrlen)
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{
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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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/* Get the underlying socket structure */
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FAR struct socket *psock = sockfd_socket(sockfd);
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/* Then let psock_connect() do all of the work */
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ret = psock_connect(psock, addr, addrlen);
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leave_cancellation_point();
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return ret;
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}
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#endif /* CONFIG_NET */
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