255 lines
8.5 KiB
C
255 lines
8.5 KiB
C
/****************************************************************************
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* net/socket/connect.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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* Input 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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* Returns zero (OK) on success. On failure, it returns a negated errno
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* value to indicate the nature of the error.
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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 ret;
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/* Verify that the psock corresponds to valid, allocated socket */
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if (psock == NULL || psock->s_conn == NULL)
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{
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return -EBADF;
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}
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/* Make sure that an address was provided */
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if (addr == NULL)
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{
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return -EFAULT;
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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);
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if (psock->s_sockif->si_connect == NULL)
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{
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return -EOPNOTSUPP;
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}
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ret = psock->s_sockif->si_connect(psock, addr, addrlen);
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if (ret >= 0 && addr->sa_family != AF_UNSPEC)
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{
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FAR struct socket_conn_s *conn = psock->s_conn;
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conn->s_flags |= _SF_CONNECTED;
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}
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return ret;
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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
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* 'sockfd' to the address specified by 'addr'. The addrlen argument
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* specifies 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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* Input 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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FAR struct socket *psock;
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int ret;
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/* accept() is a cancellation point */
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enter_cancellation_point();
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/* Get the underlying socket structure */
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ret = sockfd_socket(sockfd, &psock);
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/* Then let psock_connect() do all of the work */
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if (ret == OK)
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{
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ret = psock_connect(psock, addr, addrlen);
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}
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if (ret < 0)
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{
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set_errno(-ret);
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ret = ERROR;
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}
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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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