290 lines
9.7 KiB
C
290 lines
9.7 KiB
C
/****************************************************************************
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* net/getsockopt.c
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*
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* Copyright (C) 2007-2009, 2012 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) && defined(CONFIG_NET_SOCKOPTS)
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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 "net_internal.h"
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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/****************************************************************************
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* Function: psock_getsockopt
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*
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* Description:
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* getsockopt() retrieve thse value for the option specified by the
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* 'option' argument for the socket specified by the 'psock' argument. If
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* the size of the option value is greater than 'value_len', the value
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* stored in the object pointed to by the 'value' argument will be silently
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* truncated. Otherwise, the length pointed to by the 'value_len' argument
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* will be modified to indicate the actual length of the'value'.
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*
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* The 'level' argument specifies the protocol level of the option. To
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* retrieve options at the socket level, specify the level argument as
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* SOL_SOCKET.
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*
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* See <sys/socket.h> a complete list of values for the 'option' argument.
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*
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* Parameters:
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* psock Socket structure of the socket to query
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* level Protocol level to set the option
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* option identifies the option to get
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* value Points to the argument value
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* value_len The length of the argument value
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*
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* Returned Value:
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*
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* EINVAL
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* The specified option is invalid at the specified socket 'level' or the
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* socket has been shutdown.
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* ENOPROTOOPT
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* The 'option' is not supported by the protocol.
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* ENOTSOCK
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* The 'psock' argument does not refer to a socket.
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* ENOBUFS
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* Insufficient resources are available in the system to complete the
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* call.
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*
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* Assumptions:
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*
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****************************************************************************/
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int psock_getsockopt(FAR struct socket *psock, int level, int option,
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FAR void *value, FAR socklen_t *value_len)
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{
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int err;
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/* Verify that the socket option if valid (but might not be supported ) */
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if (!_SO_GETVALID(option) || !value || !value_len)
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{
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err = EINVAL;
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goto errout;
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}
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/* Process the option */
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switch (option)
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{
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/* The following options take a point to an integer boolean value.
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* We will blindly report the bit here although the implementation
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* is outside of the scope of getsockopt.
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*/
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case SO_DEBUG: /* Enables recording of debugging information */
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case SO_BROADCAST: /* Permits sending of broadcast messages */
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case SO_REUSEADDR: /* Allow reuse of local addresses */
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case SO_KEEPALIVE: /* Keeps connections active by enabling the
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* periodic transmission */
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case SO_OOBINLINE: /* Leaves received out-of-band data inline */
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case SO_DONTROUTE: /* Requests outgoing messages bypass standard routing */
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{
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sockopt_t optionset;
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/* Verify that option is the size of an 'int'. Should also check
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* that 'value' is properly aligned for an 'int'
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*/
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if (*value_len < sizeof(int))
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{
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err = EINVAL;
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goto errout;
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}
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/* Sample the current options. This is atomic operation and so
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* should not require any special steps for thread safety. We
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* this outside of the macro because you can never be sure what
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* a macro will do.
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*/
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optionset = psock->s_options;
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*(int*)value = _SO_GETOPT(optionset, option);
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*value_len = sizeof(int);
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}
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break;
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case SO_TYPE: /* Reports the socket type */
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{
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/* Verify that option is the size of an 'int'. Should also check
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* that 'value' is properly aligned for an 'int'
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*/
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if (*value_len < sizeof(int))
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{
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err = EINVAL;
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goto errout;
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}
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/* Return the socket type */
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*(int*)value = psock->s_type;
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*value_len = sizeof(int);
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}
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break;
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/* The following are valid only if the OS CLOCK feature is enabled */
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case SO_RCVTIMEO:
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case SO_SNDTIMEO:
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#ifndef CONFIG_DISABLE_CLOCK
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{
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socktimeo_t timeo;
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/* Verify that option is the size of an 'int'. Should also check
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* that 'value' is properly aligned for an 'int'
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*/
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if (*value_len < sizeof(struct timeval))
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{
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err = EINVAL;
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goto errout;
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}
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/* Get the timeout value. This is a atomic operation and should
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* require no special operation.
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*/
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if (option == SO_RCVTIMEO)
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{
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timeo = psock->s_rcvtimeo;
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}
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else
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{
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timeo = psock->s_sndtimeo;
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}
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/* Then return the timeout value to the caller */
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net_dsec2timeval(timeo, (struct timeval *)value);
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*value_len = sizeof(struct timeval);
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}
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break;
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#endif
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/* The following are not yet implemented */
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case SO_ACCEPTCONN: /* Reports whether socket listening is enabled */
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case SO_LINGER:
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case SO_SNDBUF: /* Sets send buffer size */
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case SO_RCVBUF: /* Sets receive buffer size */
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case SO_ERROR: /* Reports and clears error status. */
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case SO_RCVLOWAT: /* Sets the minimum number of bytes to input */
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case SO_SNDLOWAT: /* Sets the minimum number of bytes to output */
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default:
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err = ENOPROTOOPT;
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goto errout;
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}
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return OK;
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errout:
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set_errno(err);
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return ERROR;
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}
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/****************************************************************************
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* Function: getsockopt
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*
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* Description:
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* getsockopt() retrieve thse value for the option specified by the
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* 'option' argument for the socket specified by the 'sockfd' argument. If
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* the size of the option value is greater than 'value_len', the value
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* stored in the object pointed to by the 'value' argument will be silently
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* truncated. Otherwise, the length pointed to by the 'value_len' argument
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* will be modified to indicate the actual length of the'value'.
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*
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* The 'level' argument specifies the protocol level of the option. To
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* retrieve options at the socket level, specify the level argument as
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* SOL_SOCKET.
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*
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* See <sys/socket.h> a complete list of values for the 'option' argument.
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*
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* Parameters:
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* sockfd Socket descriptor of socket
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* level Protocol level to set the option
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* option identifies the option to get
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* value Points to the argument value
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* value_len The length of the argument value
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*
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* Returned Value:
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*
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* EBADF
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* The 'sockfd' argument is not a valid socket descriptor.
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* EINVAL
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* The specified option is invalid at the specified socket 'level' or the
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* socket has been shutdown.
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* ENOPROTOOPT
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* The 'option' is not supported by the protocol.
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* ENOTSOCK
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* The 'sockfd' argument does not refer to a socket.
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* ENOBUFS
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* Insufficient resources are available in the system to complete the
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* call.
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*
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* Assumptions:
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*
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****************************************************************************/
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int getsockopt(int sockfd, int level, int option, void *value, socklen_t *value_len)
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{
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FAR struct socket *psock;
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/* Get the underlying socket structure */
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/* Verify that the sockfd corresponds to valid, allocated socket */
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psock = sockfd_socket(sockfd);
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if (!psock || psock->s_crefs <= 0)
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{
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set_errno(EBADF);
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return ERROR;
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}
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/* Then let psock_getsockopt() do all of the work */
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return psock_getsockopt(psock, level, option, value, value_len);
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}
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#endif /* CONFIG_NET && CONFIG_NET_SOCKOPTS */
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