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/*
* ----------------------------------------------------
*
* TCP socket based CAN message forwarding
* for CAN-chip emulators
* (C) 2004 Lightmaze Solutions AG
* Author: Jochen Karrer
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
* ----------------------------------------------------
*/
#include <socket_can.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <errno.h>
#include <string.h>
#include <netinet/in.h>
#include "fio.h"
#include "configfile.h"
static void
close_connection(Connection *con)
{
Connection *cursor,*prev;
CanController *contr=con->canController;
close(con->sockfd);
if(con->rfh_is_active) {
FIO_RemoveFileHandler(&con->rfh);
con->rfh_is_active=0;
}
if(con->wfh_is_active) {
FIO_RemoveFileHandler(&con->wfh);
con->wfh_is_active=0;
}
for(prev=NULL,cursor=contr->con_list;cursor;prev=cursor,cursor=cursor->next)
{
if(cursor==con) {
if(prev) {
prev->next=cursor->next;
} else {
contr->con_list=cursor->next;
}
break;
}
}
free(con);
fprintf(stderr,"CAN-Bus socket connection closed\n");
return;
}
/*
* ------------------------------------------------------
* Can Send: Interface function for the Chip Emulator,
* sends a CAN-Message to all sockets connected
* a CAN Controller
* ------------------------------------------------------
*/
void
CanSend(CanController *contr,CAN_MSG *msg) {
/* To lazy for buffering and Writefilehandlers, may be added later */
Connection *con,*next;
int result;
msg->id=htonl(msg->id);
for(con=contr->con_list;con; con=next) {
next=con->next;
result = write(con->sockfd,msg,sizeof(*msg));
if(result<0) {
if(errno==EAGAIN) {
fprintf(stderr,"Tcp Buffer overrun, skiping CAN-Message\n");
} else {
close_connection(con);
}
} else if (result==0) {
close_connection(con);
}
}
return;
}
static int
read_from_sock(void *cd,int mask)
{
Connection *con = cd;
CanController *contr=con->canController;
int result,count=0;
char *cbuf=(char*)&con->imsg;
result=read(con->sockfd,cbuf+con->ibuf_wp,sizeof(CAN_MSG)-con->ibuf_wp);
if(result>0) {
count=result;
} else if(result == 0) {
close_connection(con);
return 0;
} else {
if(errno==EAGAIN) {
return 0;
} else {
close_connection(con);
return 0;
}
}
con->ibuf_wp+=count;
if(con->ibuf_wp>=sizeof(CAN_MSG)) {
con->imsg.id = ntohl(con->imsg.id);
con->ibuf_wp=0;
contr->cops->receive(contr->clientData,&con->imsg);
}
return 0;
}
static void
tcp_connect(int sockfd,char *host,unsigned short port,void *cd)
{
Connection *con=malloc(sizeof(Connection));
CanController *contr=cd;
if(!con) {
fprintf(stderr,"Out of memory\n");
exit(4326);
}
memset(con,0,sizeof(*con));
con->canController=contr;
con->sockfd=sockfd;
fcntl(sockfd,F_SETFL,O_NONBLOCK);
if(contr->con_list) {
con->next=contr->con_list;
} else {
con->next=NULL;
}
contr->con_list=con;
FIO_AddFileHandler(&con->rfh,sockfd,FIO_READABLE,read_from_sock,con);
con->rfh_is_active=1;
fprintf(stderr,"New socket connection to emulated CAN-Controller\n");
}
/*
* ----------------------------------------------------------
* Create a new Cancontroller with a Listening TCP-Socket
* ----------------------------------------------------------
*/
CanController *
CanSocketInterface_New(CanChipOperations *cops,const char *name,void *clientData)
{
CanController *contr=malloc(sizeof(CanController));
int port;
if(!contr) {
fprintf(stderr,"Out of memory\n");
exit(7645);
}
if(Config_ReadInt32(&port,name,"port")<0) {
free(contr);
return 0;
}
memset(contr,0,sizeof(*contr));
contr->cops=cops;
contr->clientData=clientData;
contr->listen_fd=FIO_InitTcpServer(&contr->tserv,tcp_connect,contr,"127.0.0.1",port);
if(contr->listen_fd<0) {
fprintf(stderr,"Can not open TCP Listening Port %d for CAN-Emulator: ",port);
perror("");
free(contr);
return NULL;
}
return contr;
}
void
CanStopRx(CanController *contr) {
Connection *cursor;
for(cursor=contr->con_list;cursor;cursor=cursor->next)
{
if(cursor->rfh_is_active) {
cursor->rfh_is_active=0;
FIO_RemoveFileHandler(&cursor->rfh);
}
}
}
void
CanStartRx(CanController *contr) {
Connection *cursor;
for(cursor=contr->con_list;cursor;cursor=cursor->next)
{
if(!cursor->rfh_is_active) {
cursor->rfh_is_active=1;
FIO_AddFileHandler(&cursor->rfh,cursor->sockfd,FIO_READABLE,read_from_sock,cursor);
}
}
}
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