452 lines
13 KiB
C
452 lines
13 KiB
C
/****************************************************************************
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* net/local/local_recvfrom.c
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*
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* Copyright (C) 2015 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_LOCAL)
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.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/net/net.h>
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#include "socket/socket.h"
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#include "local/local.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef MIN
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# define MIN(a,b) ((a) < (b) ? (a) : (b))
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_fifo_read
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*
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* Description:
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* A thin layer around local_fifo_read that handles socket-related loss-of-
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* connection events.
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*
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****************************************************************************/
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static int psock_fifo_read(FAR struct socket *psock, FAR void *buf,
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FAR size_t *readlen)
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{
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FAR struct local_conn_s *conn = (FAR struct local_conn_s *)psock->s_conn;
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int ret;
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ret = local_fifo_read(&conn->lc_infile, buf, readlen);
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if (ret < 0)
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{
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/* -ECONNRESET is a special case. We may or not have received
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* data, then the peer closed the connection.
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*/
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if (ret == -ECONNRESET)
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{
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nerr("ERROR: Lost connection: %d\n", ret);
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/* Report an ungraceful loss of connection. This should
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* eventually be reported as ENOTCONN.
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*/
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psock->s_flags &= ~(_SF_CONNECTED | _SF_CLOSED);
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conn->lc_state = LOCAL_STATE_DISCONNECTED;
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/* Did we receive any data? */
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if (*readlen <= 0)
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{
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/* No.. return the ECONNRESET error now. Otherwise,
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* process the received data and return ENOTCONN the
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* next time that psock_recvfrom() is called.
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*/
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return ret;
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}
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}
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else
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{
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nerr("ERROR: Failed to read packet: %d\n", ret);
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return ret;
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}
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}
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return OK;
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}
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/****************************************************************************
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* Name: psock_stream_recvfrom
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*
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* Description:
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* psock_stream_recvfrom() receives messages from a local stream socket.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Buffer to receive data
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* len Length of buffer
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* flags Receive flags
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* from Address of source (may be NULL)
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* fromlen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters received. If no data is
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* available to be received and the peer has performed an orderly shutdown,
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* recv() will return 0. Otherwise, on errors, -1 is returned, and errno
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* is set appropriately (see receive from for the complete list).
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_STREAM
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static inline ssize_t
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psock_stream_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
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int flags, FAR struct sockaddr *from,
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FAR socklen_t *fromlen)
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{
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FAR struct local_conn_s *conn = (FAR struct local_conn_s *)psock->s_conn;
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size_t readlen;
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int ret;
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/* Verify that this is a connected peer socket */
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if (conn->lc_state != LOCAL_STATE_CONNECTED)
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{
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nerr("ERROR: not connected\n");
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return -ENOTCONN;
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}
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/* The incoming FIFO should be open */
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DEBUGASSERT(conn->lc_infile.f_inode != NULL);
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/* Are there still bytes in the FIFO from the last packet? */
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if (conn->u.peer.lc_remaining == 0)
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{
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/* No.. Sync to the start of the next packet in the stream and get
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* the size of the next packet.
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*/
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ret = local_sync(&conn->lc_infile);
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if (ret < 0)
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{
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nerr("ERROR: Failed to get packet length: %d\n", ret);
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return ret;
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}
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else if (ret > UINT16_MAX)
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{
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nerr("ERROR: Packet is too big: %d\n", ret);
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return -E2BIG;
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}
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conn->u.peer.lc_remaining = (uint16_t)ret;
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}
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/* Read the packet */
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readlen = MIN(conn->u.peer.lc_remaining, len);
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ret = psock_fifo_read(psock, buf, &readlen);
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if (ret < 0)
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{
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return ret;
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}
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/* Adjust the number of bytes remaining to be read from the packet */
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DEBUGASSERT(readlen <= conn->u.peer.lc_remaining);
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conn->u.peer.lc_remaining -= readlen;
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/* Return the address family */
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if (from)
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{
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ret = local_getaddr(conn, from, fromlen);
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if (ret < 0)
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{
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return ret;
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}
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}
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return readlen;
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}
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#endif /* CONFIG_NET_LOCAL_STREAM */
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/****************************************************************************
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* Name: psock_dgram_recvfrom
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*
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* Description:
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* psock_dgram_recvfrom() receives messages from a local datagram socket.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Buffer to receive data
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* len Length of buffer
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* flags Receive flags
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* from Address of source (may be NULL)
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* fromlen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters received. Otherwise, on
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* errors, -1 is returned, and errno is set appropriately (see receive
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* from for the complete list).
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*
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****************************************************************************/
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#ifdef CONFIG_NET_LOCAL_DGRAM
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static inline ssize_t
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psock_dgram_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
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int flags, FAR struct sockaddr *from,
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FAR socklen_t *fromlen)
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{
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FAR struct local_conn_s *conn = (FAR struct local_conn_s *)psock->s_conn;
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uint16_t pktlen;
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size_t readlen;
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int ret;
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/* We keep packet sizes in a uint16_t, so there is a upper limit to the
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* 'len' that can be supported.
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*/
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DEBUGASSERT(len <= UINT16_MAX);
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/* Verify that this is a bound, un-connected peer socket */
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if (conn->lc_state != LOCAL_STATE_BOUND)
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{
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/* Either not bound to address or it is connected */
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nerr("ERROR: Connected or not bound\n");
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return -EISCONN;
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}
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/* The incoming FIFO should not be open */
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DEBUGASSERT(conn->lc_infile.f_inode == NULL);
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/* Make sure that half duplex FIFO has been created */
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ret = local_create_halfduplex(conn, conn->lc_path);
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if (ret < 0)
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{
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nerr("ERROR: Failed to create FIFO for %s: %d\n",
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conn->lc_path, ret);
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return ret;
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}
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/* Open the receiving side of the transfer */
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ret = local_open_receiver(conn, _SS_ISNONBLOCK(psock->s_flags) ||
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(flags & MSG_DONTWAIT) != 0);
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if (ret < 0)
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{
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nerr("ERROR: Failed to open FIFO for %s: %d\n",
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conn->lc_path, ret);
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goto errout_with_halfduplex;
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return ret;
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}
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/* Sync to the start of the next packet in the stream and get the size of
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* the next packet.
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*/
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ret = local_sync(&conn->lc_infile);
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if (ret < 0)
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{
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nerr("ERROR: Failed to get packet length: %d\n", ret);
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goto errout_with_infd;
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}
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else if (ret > UINT16_MAX)
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{
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nerr("ERROR: Packet is too big: %d\n", ret);
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goto errout_with_infd;
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}
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pktlen = ret;
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/* Read the packet */
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readlen = MIN(pktlen, len);
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ret = psock_fifo_read(psock, buf, &readlen);
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if (ret < 0)
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{
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goto errout_with_infd;
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}
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/* If there are unread bytes remaining in the packet, flush the remainder
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* of the packet to the bit bucket.
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*/
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DEBUGASSERT(readlen <= pktlen);
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if (readlen < pktlen)
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{
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uint8_t bitbucket[32];
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uint16_t remaining;
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size_t tmplen;
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remaining = pktlen - readlen;
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do
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{
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/* Read 32 bytes into the bit bucket */
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readlen = MIN(remaining, 32);
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ret = psock_fifo_read(psock, bitbucket, &tmplen);
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if (ret < 0)
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{
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goto errout_with_infd;
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}
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/* Adjust the number of bytes remaining to be read from the packet */
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DEBUGASSERT(tmplen <= remaining);
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remaining -= tmplen;
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}
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while (remaining > 0);
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}
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/* Now we can close the read-only file descriptor */
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file_close(&conn->lc_infile);
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conn->lc_infile.f_inode = NULL;
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/* Release our reference to the half duplex FIFO */
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local_release_halfduplex(conn);
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/* Return the address family */
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if (from)
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{
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ret = local_getaddr(conn, from, fromlen);
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if (ret < 0)
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{
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return ret;
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}
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}
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return readlen;
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errout_with_infd:
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/* Close the read-only file descriptor */
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file_close(&conn->lc_infile);
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conn->lc_infile.f_inode = NULL;
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errout_with_halfduplex:
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/* Release our reference to the half duplex FIFO */
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local_release_halfduplex(conn);
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return ret;
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}
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#endif /* CONFIG_NET_LOCAL_STREAM */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: local_recvfrom
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*
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* Description:
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* local_recvfrom() receives messages from a local socket and may be used
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* to receive data on a socket whether or not it is connection-oriented.
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*
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* If from is not NULL, and the underlying protocol provides the source
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* address, this source address is filled in. The argument fromlen
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* initialized to the size of the buffer associated with from, and modified
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* on return to indicate the actual size of the address stored there.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Buffer to receive data
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* len Length of buffer
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* flags Receive flags
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* from Address of source (may be NULL)
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* fromlen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters received. If no data is
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* available to be received and the peer has performed an orderly shutdown,
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* recv() will return 0. Otherwise, on errors, a negated errno value is
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* returned (see recv_from() for the complete list of appropriate error
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* values).
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*
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****************************************************************************/
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ssize_t local_recvfrom(FAR struct socket *psock, FAR void *buf,
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size_t len, int flags, FAR struct sockaddr *from,
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FAR socklen_t *fromlen)
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{
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DEBUGASSERT(psock && psock->s_conn && buf);
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/* Check for a stream socket */
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#ifdef CONFIG_NET_LOCAL_STREAM
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if (psock->s_type == SOCK_STREAM)
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{
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return psock_stream_recvfrom(psock, buf, len, flags, from, fromlen);
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}
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else
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#endif
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#ifdef CONFIG_NET_LOCAL_DGRAM
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if (psock->s_type == SOCK_DGRAM)
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{
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return psock_dgram_recvfrom(psock, buf, len, flags, from, fromlen);
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}
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else
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#endif
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{
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DEBUGPANIC();
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nerr("ERROR: Unrecognized socket type: %s\n", psock->s_type);
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return -EINVAL;
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}
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}
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#endif /* CONFIG_NET && CONFIG_NET_LOCAL */
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