ref: 2c59c1aaab0b520d3504188987056ff3702352ca
dir: /src/utils/cst_socket.c/
/*************************************************************************/
/* */
/* Language Technologies Institute */
/* Carnegie Mellon University */
/* Copyright (c) 2000 */
/* All Rights Reserved. */
/* */
/* Permission is hereby granted, free of charge, to use and distribute */
/* this software and its documentation without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of this work, and to */
/* permit persons to whom this work is furnished to do so, subject to */
/* the following conditions: */
/* 1. The code must retain the above copyright notice, this list of */
/* conditions and the following disclaimer. */
/* 2. Any modifications must be clearly marked as such. */
/* 3. Original authors' names are not deleted. */
/* 4. The authors' names are not used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* CARNEGIE MELLON UNIVERSITY AND THE CONTRIBUTORS TO THIS WORK */
/* DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING */
/* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT */
/* SHALL CARNEGIE MELLON UNIVERSITY NOR THE CONTRIBUTORS BE LIABLE */
/* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */
/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN */
/* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, */
/* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF */
/* THIS SOFTWARE. */
/* */
/*************************************************************************/
/* Author: Alan W Black (awb@cs.cmu.edu) */
/* Date: October 2000 */
/*************************************************************************/
/* */
/* Some generic socket client/server code */
/* */
/*************************************************************************/
#ifdef CST_NO_SOCKETS
int cst_socket_open(const char *host, int port)
{
(void)host;
(void)port;
return -1;
}
int cst_socket_server(const char *name, int port,
int (process_client)(int name,int fd))
{
(void)name;
(void)port;
(void)process_client;
return -1;
}
int cst_socket_close(int socket)
{
return -1;
}
#else
#include <stdio.h>
#include <stdlib.h>
#ifndef _MSC_VER
#include <unistd.h>
#endif
#include <string.h>
#include <sys/types.h>
#ifndef _MSC_VER
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#else
#include <io.h>
#include <WinSock2.h>
#pragma comment(lib, "Ws2_32.lib")
#endif
#include "cst_socket.h"
#include "cst_error.h"
int cst_socket_open(const char *host, int port)
{
/* Return an FD to a remote server */
struct sockaddr_in serv_addr;
struct hostent *serverhost;
int fd;
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (fd < 0)
{
cst_errmsg("cst_socket: can't get socket\n");
return -1;
}
memset(&serv_addr, 0, sizeof(serv_addr));
if ((serv_addr.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE)
{
/* its a name rather than an ipnum */
serverhost = gethostbyname(host);
if (serverhost == (struct hostent *)0)
{
cst_errmsg("cst_socket: gethostbyname failed\n");
return -1;
}
memmove(&serv_addr.sin_addr,serverhost->h_addr, serverhost->h_length);
}
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
if (connect(fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) != 0)
{
cst_errmsg("cst_socket: connect to server failed\n");
return -1;
}
return fd;
}
int cst_socket_close(int socket)
{
return close(socket);
}
int cst_socket_server(const char *name, int port,
int (process_client)(int name,int fd))
{
struct sockaddr_in serv_addr;
int fd, fd1;
int client_name = 0;
int one = 1;
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (fd < 0)
{
cst_errmsg("can't open socket %d\n",port);
return -1;
}
if (setsockopt(fd, SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(int)) < 0)
{
cst_errmsg("socket SO_REUSERADDR failed\n");
return -1;
}
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) != 0)
{
cst_errmsg("socket: bind failed\n");
return -1;
}
if (listen(fd, 5) != 0)
{
cst_errmsg("socket: listen failed\n");
return -1;
}
if (name)
printf("server (%s) started on port %d\n",name, port);
while(1) /* never exits except by signals */
{
if((fd1 = accept(fd, 0, 0)) < 0)
{
cst_errmsg("socket: accept failed\n");
return -1;
}
client_name++;
(process_client)(client_name,fd1);
close(fd1);
}
return 0;
}
#endif