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/****************************************************************************
* netutils/netlib/netlib_listenon.c
*
* Copyright (C) 2007-2009, 2011 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 Gregory Nutt 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 <sys/socket.h>
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <debug.h>
#include <netinet/in.h>
#include <apps/netutils/netlib.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netlib_listenon
*
* Description:
* Implement basic server listening
*
* Parameters:
* portno The port to listen on (in network byte order)
*
* Return:
* A valid listening socket or -1 on error.
*
****************************************************************************/
int netlib_listenon(uint16_t portno)
{
struct sockaddr_in myaddr;
int listensd;
#ifdef CONFIG_NET_HAVE_REUSEADDR
int optval;
#endif
/* Create a new TCP socket to use to listen for connections */
listensd = socket(PF_INET, SOCK_STREAM, 0);
if (listensd < 0)
{
ndbg("socket failure: %d\n", errno);
return ERROR;
}
/* Set socket to reuse address */
#ifdef CONFIG_NET_HAVE_REUSEADDR
optval = 1;
if (setsockopt(listensd, SOL_SOCKET, SO_REUSEADDR, (void*)&optval, sizeof(int)) < 0)
{
ndbg("setsockopt SO_REUSEADDR failure: %d\n", errno);
goto errout_with_socket;
}
#endif
/* Bind the socket to a local address */
myaddr.sin_family = AF_INET;
myaddr.sin_port = portno;
myaddr.sin_addr.s_addr = INADDR_ANY;
if (bind(listensd, (struct sockaddr*)&myaddr, sizeof(struct sockaddr_in)) < 0)
{
ndbg("bind failure: %d\n", errno);
goto errout_with_socket;
}
/* Listen for connections on the bound TCP socket */
if (listen(listensd, 5) < 0)
{
ndbg("listen failure %d\n", errno);
goto errout_with_socket;
}
/* Begin accepting connections */
nvdbg("Accepting connections on port %d\n", ntohs(portno));
return listensd;
errout_with_socket:
close(listensd);
return ERROR;
}
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