ce634578dd
Squashed commit of the following:
Author: Gregory Nutt <gnutt@nuttx.org>
net/: Trivial changes to PR from review. Biggest difference: type of s_error changed to int16_t to save a byte or two.
Author: liuhuahang <liuhuahang@xiaomi.com>
Implement SO_ERROR for getsockopt()
447 lines
16 KiB
C
447 lines
16 KiB
C
/****************************************************************************
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* net/socket/getsockopt.c
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*
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* Copyright (C) 2007-2009, 2012, 2014, 2017-2019 Gregory Nutt. All rights
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* 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 <sys/time.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include "socket/socket.h"
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#include "tcp/tcp.h"
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#include "usrsock/usrsock.h"
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#include "utils/utils.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_socketlevel_option
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*
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* Description:
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* getsockopt() retrieve the 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; to retrieve options at the TCP-protocol level, the level
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* argument is SOL_CP.
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*
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* See <sys/socket.h> a complete list of values for the socket-level
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* 'option' argument. Protocol-specific options are are protocol specific
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* header files (such as netinet/tcp.h for the case of the TCP protocol).
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*
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* Input 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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* Returns zero (OK) on success. On failure, it returns a negated errno
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* value to indicate the nature of the error. See psock_getsockopt() for
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* the complete list of appropriate return error codes.
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*
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****************************************************************************/
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static int psock_socketlevel_option(FAR struct socket *psock, int option,
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FAR void *value, FAR socklen_t *value_len)
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{
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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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return -EINVAL;
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}
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (psock == NULL || psock->s_crefs <= 0)
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{
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return -EBADF;
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}
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#ifdef CONFIG_NET_USRSOCK
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if (psock->s_type == SOCK_USRSOCK_TYPE)
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{
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FAR struct usrsock_conn_s *conn = psock->s_conn;
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DEBUGASSERT(conn);
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/* Some of the socket options are handled from this function. */
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switch (option)
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{
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case SO_TYPE: /* Type can be read from NuttX psock structure. */
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case SO_RCVTIMEO: /* Rx timeouts can be handled at NuttX side, thus
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* simplify daemon implementation. */
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case SO_SNDTIMEO: /* Rx timeouts can be handled at NuttX side, thus
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* simplify daemon implementation. */
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break;
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default: /* Other options are passed to usrsock daemon. */
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{
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return usrsock_getsockopt(conn, SOL_SOCKET, option, value, value_len);
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}
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}
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}
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#endif
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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_BROADCAST: /* Permits sending of broadcast messages */
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case SO_DEBUG: /* Enables recording of debugging information */
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case SO_DONTROUTE: /* Requests outgoing messages bypass standard routing */
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#ifndef CONFIG_NET_TCPPROTO_OPTIONS
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case SO_KEEPALIVE: /* Verifies TCP connections active by enabling the
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* periodic transmission of probes */
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#endif
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case SO_OOBINLINE: /* Leaves received out-of-band data inline */
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case SO_REUSEADDR: /* Allow reuse of local addresses */
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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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return -EINVAL;
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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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*(FAR 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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#ifdef CONFIG_NET_TCPPROTO_OPTIONS
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/* Any connection-oriented protocol could potentially support
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* SO_KEEPALIVE. However, this option is currently only available for
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* TCP/IP.
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*
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* NOTE: SO_KEEPALIVE is not really a socket-level option; it is a
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* protocol-level option. A given TCP connection may service multiple
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* sockets (via dup'ing of the socket). There is, however, still only
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* one connection to be monitored and that is a global attribute across
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* all of the clones that may use the underlying connection.
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*/
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case SO_KEEPALIVE: /* Verifies TCP connections active by enabling the
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* periodic transmission of probes */
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return tcp_getsockopt(psock, option, value, value_len);
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#endif
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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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return -EINVAL;
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}
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#ifdef CONFIG_NET_USRSOCK
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if (psock->s_type == SOCK_USRSOCK_TYPE)
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{
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FAR struct usrsock_conn_s *conn = psock->s_conn;
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/* Return the actual socket type */
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*(FAR int *)value = conn->type;
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*value_len = sizeof(int);
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break;
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}
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#endif
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/* Return the socket type */
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*(FAR 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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{
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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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return -EINVAL;
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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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case SO_ERROR: /* Reports and clears error status. */
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{
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if (*value_len != sizeof(int))
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{
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return -EINVAL;
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}
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*(FAR int *)value = (int)psock->s_error;
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psock->s_error = 0;
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}
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break;
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/* The following are not yet implemented (return values other than {0,1) */
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case SO_ACCEPTCONN: /* Reports whether socket listening is enabled */
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case SO_LINGER: /* Lingers on a close() if data is present */
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case SO_RCVBUF: /* Sets receive buffer size */
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case SO_RCVLOWAT: /* Sets the minimum number of bytes to input */
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case SO_SNDBUF: /* Sets send buffer size */
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case SO_SNDLOWAT: /* Sets the minimum number of bytes to output */
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default:
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return -ENOPROTOOPT;
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}
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_getsockopt
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*
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* Description:
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* getsockopt() retrieve the 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; to retrieve options at the TCP-protocol level, the level
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* argument is SOL_CP.
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*
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* See <sys/socket.h> a complete list of values for the socket-level
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* 'option' argument. Protocol-specific options are are protocol specific
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* header files (such as netinet/tcp.h for the case of the TCP protocol).
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*
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* Input 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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* 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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* 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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****************************************************************************/
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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 ret;
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/* Handle retrieval of the socket option according to the level at which
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* option should be applied.
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*/
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switch (level)
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{
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case SOL_SOCKET: /* Socket-level options (see include/sys/socket.h) */
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ret = psock_socketlevel_option(psock, option, value, value_len);
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break;
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case SOL_TCP: /* TCP protocol socket options (see include/netinet/tcp.h) */
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#ifdef CONFIG_NET_TCPPROTO_OPTIONS
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ret = tcp_getsockopt(psock, option, value, value_len);
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break;
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#endif
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/* These levels are defined in sys/socket.h, but are not yet
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* implemented.
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*/
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case SOL_IP: /* TCP protocol socket options (see include/netinet/ip.h) */
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case SOL_IPV6: /* TCP protocol socket options (see include/netinet/ip6.h) */
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case SOL_UDP: /* TCP protocol socket options (see include/netinit/udp.h) */
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ret = -ENOSYS;
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break;
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default: /* The provided level is invalid */
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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/****************************************************************************
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* Name: getsockopt
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*
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* Description:
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* getsockopt() retrieve the 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; to retrieve options at the TCP-protocol level, the level
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* argument is SOL_CP.
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*
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* See <sys/socket.h> a complete list of values for the socket-level
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* 'option' argument. Protocol-specific options are are protocol specific
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* header files (such as netinet/tcp.h for the case of the TCP protocol).
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*
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* Input 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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* Returns zero (OK) on success. On failure, -1 (ERROR) is returned and th
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* errno variable is set appropriately:
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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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****************************************************************************/
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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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int ret;
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/* Get the underlying socket structure */
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psock = sockfd_socket(sockfd);
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/* Then let psock_getsockopt() do all of the work */
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ret = psock_getsockopt(psock, level, option, value, value_len);
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if (ret < 0)
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{
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set_errno(-ret);
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return ERROR;
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}
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return OK;
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}
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#endif /* CONFIG_NET && CONFIG_NET_SOCKOPTS */
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