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CU Amiga Magazine CD-ROM Special Edition (1995)(EMAP Images)(GB)[Issue 1995-11].iso
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src
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smisc.c
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C/C++ Source or Header
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1989-06-24
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2KB
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133 lines
/* Miscellaneous servers */
#include <stdio.h>
#include "machdep.h"
#include "mbuf.h"
#include "netuser.h"
#include "timer.h"
#include "tcp.h"
static struct tcb *disc_tcb,*echo_tcb;
/* Start up discard server */
discard_start(argc,argv)
int argc;
char *argv[];
{
struct socket lsocket;
void r_discard(),t_state(),t_state();
lsocket.address = ip_addr;
if(argc < 2)
lsocket.port = 9;
else
lsocket.port = atoi(argv[1]);
disc_tcb = open_tcp(&lsocket,NULLSOCK,TCP_PASSIVE,0,r_discard,NULLVFP,t_state,0);
}
/* Start echo server */
echo_start(argc,argv)
int argc;
char *argv[];
{
void r_echo(),t_echo(),t_state();
struct socket lsocket;
lsocket.address = ip_addr;
if(argc < 2)
lsocket.port = 7;
else
lsocket.port = atoi(argv[1]);
echo_tcb = open_tcp(&lsocket,NULLSOCK,TCP_PASSIVE,0,r_echo,t_echo,t_state,0);
}
/* Shut down miscellaneous servers */
discard_stop()
{
if(disc_tcb != NULLTCB)
close_tcp(disc_tcb);
}
echo_stop()
{
if(echo_tcb != NULLTCB)
close_tcp(echo_tcb);
}
/* Discard server receiver upcall */
static
void
r_discard(tcb,cnt)
struct tcb *tcb;
int cnt;
{
struct mbuf *bp;
if(recv_tcp(tcb,&bp,cnt) > 0)
free_p(bp); /* Discard */
}
/* Echo server receive
* Copies only as much will fit on the transmit queue
*/
static
void
r_echo(tcb,cnt)
struct tcb *tcb;
int cnt;
{
struct mbuf *bp;
int acnt;
if(cnt == 0){
close_tcp(tcb);
return;
}
acnt = min(cnt,tcb->snd.wnd);
if(acnt > 0){
/* Get only as much will fit in the send window */
recv_tcp(tcb,&bp,tcb->snd.wnd);
send_tcp(tcb,bp);
}
}
/* Echo server transmit
* Copies anything that might have been left in the receiver queue
*/
static
void
t_echo(tcb,cnt)
struct tcb *tcb;
int cnt;
{
struct mbuf *bp;
if(tcb->rcvcnt > 0){
/* Get only as much will fit in the send window */
recv_tcp(tcb,&bp,cnt);
send_tcp(tcb,bp);
}
}
/* Log connection state changes; also respond to remote closes */
static
void
t_state(tcb,old,new)
register struct tcb *tcb;
char old,new;
{
switch(new){
case ESTABLISHED:
log(tcb,"open %d",tcb->conn.local.port);
break;
case CLOSE_WAIT:
close_tcp(tcb);
break;
case CLOSED:
log(tcb,"close %d",tcb->conn.local.port);
del_tcp(tcb);
/* Clean up if server is being shut down */
if(tcb == disc_tcb)
disc_tcb = NULLTCB;
else if(tcb == echo_tcb)
echo_tcb = NULLTCB;
break;
}
}