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/*
* Copyright (C) 2001 Sebastian Krahmer.
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Sebastian Krahmer.
* 4. The name Sebastian Krahmer may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <string.h>
#include <string>
#include <errno.h>
#include "socket.h"
namespace NS_Socket {
string error;
const char *why()
{
return error.c_str();
}
// disable Mr. Nagle's algorithm
int nodelay(int sock)
{
int one = 1;
socklen_t len = sizeof(one);
if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &one, len) < 0) {
error = "NS_Socket::nodelay::setsockopt: ";
error += strerror(errno);
return -1;
}
return 0;
}
// make socket ready for port-reuse
int reuse(int sock)
{
int one = 1;
socklen_t len = sizeof(one);
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, len) < 0) {
error = "NS_Socket::reuse::setsockopt: ";
error += strerror(errno);
return -1;
}
return 0;
}
#ifdef FREEBSD
#define LINUX22
#endif
// obtain real destination of connection
int dstaddr(int sock, sockaddr_in *dst)
{
if (!dst) {
error = "NS_Socket::dstaddr: dst == NULL";
return -1;
}
#ifdef LINUX22
socklen_t size = sizeof(sockaddr_in);
if (getsockname(sock, (struct sockaddr*)dst, &size) < 0) {
error = "NS_Socket::dstaddr::getsockname: ";
error += strerror(errno);
return -1;
}
#elif defined(LINUX24)
#include <linux/netfilter_ipv4.h>
socklen_t size = sizeof(sockaddr_in);
if (getsockopt(sock, SOL_IP, SO_ORIGINAL_DST, dst, &size) < 0) {
error = "NS_Socket::dstaddr::getsockopt: ";
error += strerror(errno);
return -1;
}
#else
#error "Not supported on this OS yet."
#endif
return 0;
}
int bind_local(int sock, int port, bool do_listen)
{
struct sockaddr_in saddr;
memset(&saddr, 0, sizeof(saddr));
saddr.sin_port = htons(port);
saddr.sin_family = AF_INET;
if (reuse(sock) < 0)
return -1;
if (bind(sock, (struct sockaddr*)&saddr, sizeof(saddr)) < 0) {
error = "NS_Socket::bind_local::bind: ";
error += strerror(errno);
return -1;
}
if (do_listen) {
if (listen(sock, SOMAXCONN) < 0) {
error = "NS_Socket::bind_local::listen: ";
error += strerror(errno);
return -1;
}
}
return 0;
}
}; // namespace
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