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/*
* WarGames - a WOPR emulator written in C
* Copyright (C) 2014 Franklin Wei
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Contact the author at contact@fwei.tk
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <errno.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include "joshua.h"
int server_socket;
uint16_t port;
int pipes[FD_SETSIZE][2];
int make_server_socket(uint16_t port)
{
int sock;
struct sockaddr_in name;
sock=socket(AF_INET, SOCK_STREAM, 0);
if(sock<0)
{
printf("error creating socket.\n");
return -1;
}
name.sin_family=AF_INET;
name.sin_port=htons(port);
name.sin_addr.s_addr=htonl(INADDR_ANY);
int ret=bind(sock, (struct sockaddr*) &name, sizeof(name));
if(ret<0)
{
printf("error binding to port %d\n", port);
return -1;
}
return sock;
}
int process_data(int fd)
{
char buf[1024];
memset(buf, 0, sizeof(buf));
int ret=read(fd, buf, sizeof(buf));
if(ret<0) /* error */
{
printf("error in read()\n");
return -1;
}
if(ret==0)
{
printf("EOF from client\n");
return -1;
}
else
{
printf("Client sends: %s\n", buf);
write(pipes[fd][1], buf, strlen(buf));
return 0;
}
}
void serv_cleanup()
{
printf("preparing to exit...\n");
fflush(stdout);
shutdown(server_socket, SHUT_RDWR);
close(server_socket);
}
int main(int argc, char* argv[])
{
if(argc!=2)
{
printf("Usage: %s PORT\n", argv[0]);
return 2;
}
printf("starting server...\n");
port=atoi(argv[1]);
signal(SIGINT, &serv_cleanup);
int sock=make_server_socket(port);
server_socket=sock;
fd_set active_fd_set, read_fd_set;
struct sockaddr_in client;
if(listen(sock, 1)<0)
{
printf("error listening.\n");
return 1;
}
FD_ZERO(&active_fd_set);
FD_SET(sock, &active_fd_set);
printf("listening on port %d\n", port);
while(1)
{
read_fd_set=active_fd_set;
int ret=select(FD_SETSIZE, &read_fd_set, 0,0,0);
if(ret<0)
{
printf("select() returned error.\n");
return 1;
}
for(int i=0;i<FD_SETSIZE;++i)
{
if(FD_ISSET(i, &read_fd_set))
{
if(i==sock)
{
/* new connection */
int new, size;
size=sizeof(client);
new=accept(sock, (struct sockaddr*) &client, &size);
if(new<0)
{
printf("error accepting connection.\n");
return 1;
}
printf("new connection.\n");
FD_SET(new, &active_fd_set);
int ret=pipe(pipes[new]);
if(ret<0)
{
printf("pipe error.\n");
}
pid_t pid=fork();
if(pid==0) /* child */
{
be_joshua(new);
close(new);
FD_CLR(new, &active_fd_set);
exit(0);
}
}
else
{
/* data from existing connection */
if(process_data(i)<0)
{
close(i);
FD_CLR(i, &active_fd_set);
}
}
}
}
}
}
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