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HAM Radio 1
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src0131
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ttylink.c
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C/C++ Source or Header
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1991-01-26
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109 lines
/* Internet TTY "link" (keyboard chat) server
* Copyright 1991 Phil Karn, KA9Q
*/
#include <stdio.h>
#include "global.h"
#include "mbuf.h"
#include "socket.h"
#include "telnet.h"
#include "session.h"
#include "proc.h"
#include "tty.h"
#include "mailbox.h"
#include "commands.h"
static int Sttylink = -1; /* Protoype socket for service */
int
ttylstart(argc,argv,p)
int argc;
char *argv[];
void *p;
{
struct sockaddr_in lsocket;
int s,type;
if(Sttylink != -1){
return 0;
}
psignal(Curproc,0); /* Don't keep the parser waiting */
chname(Curproc,"TTYlink listener");
lsocket.sin_family = AF_INET;
lsocket.sin_addr.s_addr = INADDR_ANY;
if(argc < 2)
lsocket.sin_port = IPPORT_TTYLINK;
else
lsocket.sin_port = atoi(argv[1]);
Sttylink = socket(AF_INET,SOCK_STREAM,0);
bind(Sttylink,(char *)&lsocket,sizeof(lsocket));
listen(Sttylink,1);
for(;;){
if((s = accept(Sttylink,NULLCHAR,(int *)NULL)) == -1)
break; /* Service is shutting down */
if(availmem() < Memthresh){
usprintf(s,"System is overloaded; try again later\n");
shutdown(s,1);
} else {
type = TELNET;
newproc("chat",2048,ttylhandle,s,(void *)&type,NULL,0);
}
}
return 0;
}
/* This function handles all incoming "chat" sessions, be they TCP,
* NET/ROM or AX.25
*/
void
ttylhandle(s,t,p)
int s;
void *t;
void *p;
{
int type,index;
struct session *sp;
char addr[MAXSOCKSIZE];
int len = MAXSOCKSIZE;
struct telnet tn;
type = * (int *)t;
sockmode(s,SOCK_ASCII);
sockowner(s,Curproc); /* We own it now */
log(s,"open %s",Sestypes[type]);
/* Allocate a session descriptor */
if((sp = newsession(NULLCHAR,type)) == NULLSESSION){
usprintf(s,"Too many sessions\n");
close_s(s);
return;
}
index = sp - Sessions;
/* Initialize a Telnet protocol descriptor */
memset((char *)&tn,0,sizeof(tn));
tn.session = sp; /* Upward pointer */
sp->cb.telnet = &tn; /* Downward pointer */
sp->s = s;
sp->proc = Curproc;
getpeername(s,addr,&len);
tprintf("\007Incoming %s session %u from %s\007\n",
Sestypes[type],index,psocket(addr));
tnrecv(&tn);
}
/* Shut down Ttylink server */
int
ttyl0(argc,argv,p)
int argc;
char *argv[];
void *p;
{
close_s(Sttylink);
Sttylink = -1;
return 0;
}