/* tcp.c -- Definition of functions for peripheral to
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/* tcp.c -- Definition of functions for peripheral to
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* communicate with host via a tcp socket.
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* communicate with host via a tcp socket.
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Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca>
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Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca>
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This file is part of OpenRISC 1000 Architectural Simulator.
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This file is part of OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/in.h>
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#include <fcntl.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <unistd.h>
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#include <unistd.h>
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#include "channel.h"
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#include "channel.h"
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#include "generic.h"
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#include "generic.h"
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#include "fd.h"
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#include "fd.h"
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struct tcp_channel
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struct tcp_channel
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{
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{
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struct fd_channel fds;
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struct fd_channel fds;
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int socket_fd; /* Socket to listen to */
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int socket_fd; /* Socket to listen to */
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int port_number; /* TCP port number */
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int port_number; /* TCP port number */
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int connected; /* If 0, no remote endpoint yet */
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int connected; /* If 0, no remote endpoint yet */
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int nonblocking; /* If 0, read/write will block until
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int nonblocking; /* If 0, read/write will block until
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remote client connects */
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remote client connects */
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};
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};
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static void * tcp_init(const char * input)
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static void * tcp_init(const char * input)
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{
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{
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int port_number, fd, flags;
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int port_number, fd, flags;
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struct sockaddr_in local_ip;
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struct sockaddr_in local_ip;
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struct tcp_channel* channel = (struct tcp_channel*)malloc(sizeof(struct tcp_channel));
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struct tcp_channel* channel = (struct tcp_channel*)malloc(sizeof(struct tcp_channel));
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if (!channel)
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if (!channel)
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return NULL;
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return NULL;
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fd = 0;
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fd = 0;
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channel->nonblocking = 1;
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channel->nonblocking = 1;
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channel->fds.fdin = -1;
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channel->fds.fdin = -1;
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channel->fds.fdout = -1;
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channel->fds.fdout = -1;
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channel->socket_fd = -1;
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channel->socket_fd = -1;
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channel->port_number = -1;
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channel->port_number = -1;
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port_number = atoi(input);
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port_number = atoi(input);
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if (port_number == 0)
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if (port_number == 0)
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goto error;
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goto error;
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fd = socket(AF_INET, SOCK_STREAM, 0);
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fd = socket(AF_INET, SOCK_STREAM, 0);
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if (fd < 0)
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if (fd < 0)
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goto error;
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goto error;
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flags = 1;
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flags = 1;
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if(setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,(const char*)&flags,sizeof(int)) < 0)
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if(setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,(const char*)&flags,sizeof(int)) < 0)
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{
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{
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perror("Can not set SO_REUSEADDR option on channel socket");
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perror("Can not set SO_REUSEADDR option on channel socket");
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goto error;
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goto error;
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}
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}
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memset(&local_ip, 0, sizeof(local_ip));
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memset(&local_ip, 0, sizeof(local_ip));
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local_ip.sin_family = AF_INET;
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local_ip.sin_family = AF_INET;
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local_ip.sin_addr.s_addr = htonl(INADDR_ANY);
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local_ip.sin_addr.s_addr = htonl(INADDR_ANY);
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local_ip.sin_port = htons(port_number);
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local_ip.sin_port = htons(port_number);
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if (bind(fd, (struct sockaddr*)&local_ip, sizeof(local_ip)) < 0) {
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if (bind(fd, (struct sockaddr*)&local_ip, sizeof(local_ip)) < 0) {
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perror("Can't bind local address");
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perror("Can't bind local address");
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goto error;
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goto error;
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}
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}
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if (channel->nonblocking) {
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if (channel->nonblocking) {
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if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
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if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
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{
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{
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perror("Can not make channel socket non-blocking");
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perror("Can not make channel socket non-blocking");
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goto error;
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goto error;
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}
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}
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}
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}
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if (listen(fd, 1) < 0)
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if (listen(fd, 1) < 0)
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goto error;
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goto error;
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channel->socket_fd = fd;
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channel->socket_fd = fd;
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channel->port_number = port_number;
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channel->port_number = port_number;
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channel->connected = 0;
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channel->connected = 0;
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return (void*)channel;
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return (void*)channel;
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error:
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error:
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if (fd)
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if (fd)
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close(fd);
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close(fd);
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free(channel);
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free(channel);
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return NULL;
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return NULL;
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}
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}
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static int tcp_open(void * data)
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static int tcp_open(void * data)
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{
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{
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/* Socket is opened lazily, upon first read or write, so do nothing here */
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/* Socket is opened lazily, upon first read or write, so do nothing here */
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return 0;
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return 0;
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}
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}
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static int wait_for_tcp_connect(struct tcp_channel* channel)
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static int wait_for_tcp_connect(struct tcp_channel* channel)
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{
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{
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int fd;
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int fd;
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socklen_t sizeof_remote_ip;
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socklen_t sizeof_remote_ip;
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struct sockaddr_in remote_ip;
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struct sockaddr_in remote_ip;
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sizeof_remote_ip = sizeof(remote_ip);
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sizeof_remote_ip = sizeof(remote_ip);
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fd = accept(channel->socket_fd, (struct sockaddr*)&remote_ip, &sizeof_remote_ip);
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fd = accept(channel->socket_fd, (struct sockaddr*)&remote_ip, &sizeof_remote_ip);
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if (fd < 0) {
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if (fd < 0) {
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if (channel->nonblocking) {
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if (channel->nonblocking) {
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/* Not an error if there is not yet a remote connection - try again later */
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/* Not an error if there is not yet a remote connection - try again later */
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if (errno == EAGAIN)
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if (errno == EAGAIN)
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return 0;
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return 0;
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}
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}
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perror("Couldn't accept connection");
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perror("Couldn't accept connection");
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return -1;
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return -1;
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}
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}
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channel->fds.fdin = channel->fds.fdout = fd;
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channel->fds.fdin = channel->fds.fdout = fd;
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close(channel->socket_fd);
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close(channel->socket_fd);
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channel->socket_fd = -1;
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channel->socket_fd = -1;
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channel->connected = 1;
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channel->connected = 1;
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return 1;
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return 1;
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}
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}
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static int tcp_read(void * data, char * buffer, int size)
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static int tcp_read(void * data, char * buffer, int size)
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{
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{
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struct tcp_channel* channel = data;
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struct tcp_channel* channel = data;
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/* Lazily connect to tcp partner on read/write */
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/* Lazily connect to tcp partner on read/write */
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if (!channel->connected) {
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if (!channel->connected) {
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int retval = wait_for_tcp_connect(data);
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int retval = wait_for_tcp_connect(data);
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if (retval <= 0)
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if (retval <= 0)
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return retval;
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return retval;
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}
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}
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return fd_read(data, buffer, size);
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return fd_read(data, buffer, size);
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}
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}
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static int tcp_write(void * data, const char * buffer, int size)
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static int tcp_write(void * data, const char * buffer, int size)
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{
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{
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struct tcp_channel* channel = data;
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struct tcp_channel* channel = data;
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/* Lazily connect to tcp partner on read/write */
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/* Lazily connect to tcp partner on read/write */
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if (!channel->connected) {
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if (!channel->connected) {
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int retval = wait_for_tcp_connect(data);
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int retval = wait_for_tcp_connect(data);
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if (retval < 0)
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if (retval < 0)
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return retval;
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return retval;
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}
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}
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return fd_write(data, buffer, size);
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return fd_write(data, buffer, size);
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}
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}
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struct channel_ops tcp_channel_ops =
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struct channel_ops tcp_channel_ops =
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{
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{
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init: tcp_init,
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init: tcp_init,
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open: tcp_open,
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open: tcp_open,
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close: generic_close,
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close: generic_close,
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read: tcp_read,
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read: tcp_read,
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write: tcp_write,
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write: tcp_write,
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free: generic_free,
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free: generic_free,
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};
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};
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/*
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/*
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* Local variables:
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* Local variables:
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* c-file-style: "linux"
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* c-file-style: "linux"
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* End:
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* End:
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*/
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*/
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