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- /****************************************************************************
- * net/local/local_recvpacket.c
- *
- * Copyright (C) 2015 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <sys/types.h>
- #include <stdint.h>
- #include <unistd.h>
- #include <string.h>
- #include <errno.h>
- #include <assert.h>
- #include <debug.h>
- #include <nuttx/fs/fs.h>
- #include "local/local.h"
- #if defined(CONFIG_NET) && defined(CONFIG_NET_LOCAL)
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: local_fifo_read
- *
- * Description:
- * Read a data from the read-only FIFO.
- *
- * Input Parameters:
- * filep - File structure of write-only FIFO.
- * buf - Local to store the received data
- * len - Length of data to receive [in]
- * Length of data actually received [out]
- *
- * Returned Value:
- * Zero is returned on success; a negated errno value is returned on any
- * failure. If -ECONNRESET is received, then the sending side has closed
- * the FIFO. In this case, the returned data may still be valid (if the
- * returned len > 0).
- *
- ****************************************************************************/
- int local_fifo_read(FAR struct file *filep, FAR uint8_t *buf, size_t *len)
- {
- ssize_t remaining;
- ssize_t nread;
- int ret;
- DEBUGASSERT(buf && len);
- remaining = *len;
- while (remaining > 0)
- {
- nread = file_read(filep, buf, remaining);
- if (nread < 0)
- {
- if (nread != -EINTR)
- {
- ret = (int)nread;
- nerr("ERROR: nx_read() failed: %d\n", ret);
- goto errout;
- }
- ninfo("Ignoring signal\n");
- }
- else if (nread == 0)
- {
- /* The FIFO returns zero if the sending side of the connection
- * has closed the FIFO.
- */
- ret = -ECONNRESET;
- goto errout;
- }
- else
- {
- DEBUGASSERT(nread <= remaining);
- remaining -= nread;
- buf += nread;
- }
- }
- ret = OK;
- errout:
- *len -= remaining;
- return ret;
- }
- /****************************************************************************
- * Name: local_sync
- *
- * Description:
- * Read a sync bytes until the start of the packet is found.
- *
- * Input Parameters:
- * filep - File structure of write-only FIFO.
- *
- * Returned Value:
- * The non-zero size of the following packet is returned on success; a
- * negated errno value is returned on any failure.
- *
- ****************************************************************************/
- int local_sync(FAR struct file *filep)
- {
- size_t readlen;
- uint16_t pktlen;
- uint8_t sync;
- int ret;
- /* Loop until a valid pre-amble is encountered: SYNC bytes followed
- * by one END byte.
- */
- do
- {
- /* Read until we encounter a sync byte */
- do
- {
- readlen = sizeof(uint8_t);
- ret = local_fifo_read(filep, &sync, &readlen);
- if (ret < 0)
- {
- nerr("ERROR: Failed to read sync bytes: %d\n", ret);
- return ret;
- }
- }
- while (sync != LOCAL_SYNC_BYTE);
- /* Then read to the end of the SYNC sequence */
- do
- {
- readlen = sizeof(uint8_t);
- ret = local_fifo_read(filep, &sync, &readlen);
- if (ret < 0)
- {
- nerr("ERROR: Failed to read sync bytes: %d\n", ret);
- return ret;
- }
- }
- while (sync == LOCAL_SYNC_BYTE);
- }
- while (sync != LOCAL_END_BYTE);
- /* Then read the packet length */
- readlen = sizeof(uint16_t);
- ret = local_fifo_read(filep, (FAR uint8_t *)&pktlen, &readlen);
- return ret < 0 ? ret : pktlen;
- }
- /****************************************************************************
- * Name: local_getaddr
- *
- * Description:
- * Return the Unix domain address of a connection.
- *
- * Input Parameters:
- * conn - The connection
- * addr - The location to return the address
- * addrlen - The size of the memory allocated by the caller to receive the
- * address.
- *
- * Returned Value:
- * Zero (OK) on success; a negated errno value on failure.
- *
- ****************************************************************************/
- int local_getaddr(FAR struct local_conn_s *conn, FAR struct sockaddr *addr,
- FAR socklen_t *addrlen)
- {
- FAR struct sockaddr_un *unaddr;
- int totlen;
- int pathlen;
- DEBUGASSERT(conn && addr && addrlen && *addrlen >= sizeof(sa_family_t));
- /* Get the length of the path (minus the NUL terminator) and the length
- * of the whole Unix domain address.
- */
- pathlen = strnlen(conn->lc_path, UNIX_PATH_MAX - 1);
- totlen = sizeof(sa_family_t) + pathlen + 1;
- /* If the length of the whole Unix domain address is larger than the
- * buffer provided by the caller, then truncate the address to fit.
- */
- if (totlen > *addrlen)
- {
- pathlen -= (totlen - *addrlen);
- totlen = *addrlen;
- }
- /* Copy the Unix domain address */
- unaddr = (FAR struct sockaddr_un *)addr;
- unaddr->sun_family = AF_LOCAL;
- memcpy(unaddr->sun_path, conn->lc_path, pathlen);
- unaddr->sun_path[pathlen] = '\0';
- /* Return the Unix domain address size */
- *addrlen = totlen;
- return OK;
- }
- #endif /* CONFIG_NET && CONFIG_NET_LOCAL */
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