int
TerminalSpecialChars (int c)
{
if (c == termIntChar)
{
intp ();
return 0;
}
else if (c == termQuitChar)
{
#ifdef KLUDGELINEMODE
if (kludgelinemode)
sendbrk ();
else
#endif
sendabort ();
return 0;
}
else if (c == termEofChar)
{
if (my_want_state_is_will (TELOPT_LINEMODE))
{
sendeof ();
return 0;
}
return 1;
}
else if (c == termSuspChar)
{
sendsusp ();
return (0);
}
else if (c == termFlushChar)
{
xmitAO (); /* Transmit Abort Output */
return 0;
}
else if (!MODE_LOCAL_CHARS (globalmode))
{
if (c == termKillChar)
{
xmitEL ();
return 0;
}
else if (c == termEraseChar)
{
xmitEC (); /* Transmit Erase Character */
return 0;
}
}
return 1;
}
/* ARGSUSED */
SIG_FUNC_RET
intr2(int sig)
{
if (localchars) {
#ifdef KLUDGELINEMODE
if (kludgelinemode)
sendbrk();
else
#endif
sendabort();
return;
}
}
static void
intr2 (int sig)
{
(void) sig;
if (localchars)
{
#ifdef KLUDGELINEMODE
if (kludgelinemode)
sendbrk ();
else
#endif
sendabort ();
return;
}
}
/*
* Send a string to the modem, processing for \336 (sleep 1 sec)
* and \335 (break signal)
*/
void zmputs(char *s)
{
int c;
Syslog('z', "zmputs: \"%s\"", printable(s, strlen(s)));
while (*s) {
switch (c = *s++) {
case '\336': Syslog('z', "zmputs: sleep(1)");
sleep(1);
continue;
case '\335': Syslog('z', "zmputs: send break");
sendbrk();
continue;
default: PUTCHAR(c);
}
}
}
/*
* Send a string to the modem, processing for \336 (sleep 1 sec)
* and \335 (break signal)
*/
static void zmputs(char *s)
{
char *p;
while (s && *s) {
p = strpbrk(s, "\335\336");
if (!p) {
write(iofd, s, strlen(s));
return;
}
if (p != s) {
write(iofd, s, p - s);
s = p;
}
if (*p == '\336')
sleep(1);
else
sendbrk();
p++;
}
}
void
telrcv()
{
register int c;
static int state = TS_DATA;
#if defined(CRAY2) && defined(UNICOS5)
char *opfrontp = pfrontp;
#endif
while (ncc > 0) {
if ((&ptyobuf[BUFSIZ] - pfrontp) < 2)
break;
c = *netip++ & 0377, ncc--;
switch (state) {
case TS_CR:
state = TS_DATA;
/* Strip off \n or \0 after a \r */
if ((c == 0) || (c == '\n')) {
break;
}
/* FALL THROUGH */
case TS_DATA:
if (c == IAC) {
state = TS_IAC;
break;
}
/*
* We now map \r\n ==> \r for pragmatic reasons.
* Many client implementations send \r\n when
* the user hits the CarriageReturn key.
*
* We USED to map \r\n ==> \n, since \r\n says
* that we want to be in column 1 of the next
* printable line, and \n is the standard
* unix way of saying that (\r is only good
* if CRMOD is set, which it normally is).
*/
if ((c == '\r') && his_state_is_wont(TELOPT_BINARY)) {
int nc = *netip;
#ifdef LINEMODE
/*
* If we are operating in linemode,
* convert to local end-of-line.
*/
if (linemode && (ncc > 0) && (('\n' == nc) ||
((0 == nc) && tty_iscrnl())) ) {
netip++;
ncc--;
c = '\n';
} else
#endif
{
state = TS_CR;
}
}
*pfrontp++ = c;
break;
case TS_IAC:
gotiac:
switch (c) {
/*
* Send the process on the pty side an
* interrupt. Do this with a NULL or
* interrupt char; depending on the tty mode.
*/
case IP:
DIAG(TD_OPTIONS,
printoption("td: recv IAC", c));
interrupt();
break;
case BREAK:
DIAG(TD_OPTIONS,
printoption("td: recv IAC", c));
sendbrk();
break;
/*
* Are You There?
*/
case AYT:
DIAG(TD_OPTIONS,
printoption("td: recv IAC", c));
recv_ayt();
break;
/*
* Abort Output
*/
case AO:
{
DIAG(TD_OPTIONS,
printoption("td: recv IAC", c));
ptyflush(); /* half-hearted */
init_termbuf();
if (slctab[SLC_AO].sptr &&
*slctab[SLC_AO].sptr != (cc_t)(_POSIX_VDISABLE)) {
*pfrontp++ =
(unsigned char)*slctab[SLC_AO].sptr;
}
netclear(); /* clear buffer back */
*nfrontp++ = IAC;
*nfrontp++ = DM;
neturg = nfrontp-1; /* off by one XXX */
DIAG(TD_OPTIONS,
printoption("td: send IAC", DM));
break;
}
/*
* Erase Character and
* Erase Line
*/
case EC:
case EL:
{
cc_t ch;
DIAG(TD_OPTIONS,
printoption("td: recv IAC", c));
ptyflush(); /* half-hearted */
init_termbuf();
if (c == EC)
ch = *slctab[SLC_EC].sptr;
else
ch = *slctab[SLC_EL].sptr;
if (ch != (cc_t)(_POSIX_VDISABLE))
*pfrontp++ = (unsigned char)ch;
break;
}
/*
* Check for urgent data...
*/
case DM:
DIAG(TD_OPTIONS,
printoption("td: recv IAC", c));
SYNCHing = stilloob(net);
settimer(gotDM);
break;
/*
* Begin option subnegotiation...
*/
case SB:
state = TS_SB;
SB_CLEAR();
continue;
case WILL:
state = TS_WILL;
continue;
case WONT:
state = TS_WONT;
continue;
case DO:
state = TS_DO;
continue;
case DONT:
state = TS_DONT;
continue;
case EOR:
if (his_state_is_will(TELOPT_EOR))
doeof();
break;
/*
* Handle RFC 10xx Telnet linemode option additions
* to command stream (EOF, SUSP, ABORT).
*/
case xEOF:
doeof();
break;
case SUSP:
sendsusp();
break;
case ABORT:
sendbrk();
break;
case IAC:
*pfrontp++ = c;
break;
}
state = TS_DATA;
break;
case TS_SB:
if (c == IAC) {
state = TS_SE;
} else {
SB_ACCUM(c);
}
break;
case TS_SE:
if (c != SE) {
if (c != IAC) {
/*
* bad form of suboption negotiation.
* handle it in such a way as to avoid
* damage to local state. Parse
* suboption buffer found so far,
* then treat remaining stream as
* another command sequence.
*/
/* for DIAGNOSTICS */
SB_ACCUM(IAC);
SB_ACCUM(c);
subpointer -= 2;
SB_TERM();
suboption();
state = TS_IAC;
goto gotiac;
}
SB_ACCUM(c);
state = TS_SB;
} else {
/* for DIAGNOSTICS */
SB_ACCUM(IAC);
SB_ACCUM(SE);
subpointer -= 2;
SB_TERM();
suboption(); /* handle sub-option */
state = TS_DATA;
}
break;
case TS_WILL:
willoption(c);
state = TS_DATA;
continue;
case TS_WONT:
wontoption(c);
state = TS_DATA;
continue;
case TS_DO:
dooption(c);
state = TS_DATA;
continue;
case TS_DONT:
dontoption(c);
state = TS_DATA;
continue;
default:
syslog(LOG_ERR, "telnetd: panic state=%d\n", state);
printf("telnetd: panic state=%d\n", state);
exit(1);
}
}
#if defined(CRAY2) && defined(UNICOS5)
if (!linemode) {
char xptyobuf[BUFSIZ+NETSLOP];
char xbuf2[BUFSIZ];
register char *cp;
int n = pfrontp - opfrontp, oc;
memmove(xptyobuf, opfrontp, n);
pfrontp = opfrontp;
pfrontp += term_input(xptyobuf, pfrontp, n, BUFSIZ+NETSLOP,
xbuf2, &oc, BUFSIZ);
for (cp = xbuf2; oc > 0; --oc)
if ((*nfrontp++ = *cp++) == IAC)
*nfrontp++ = IAC;
}
#endif /* defined(CRAY2) && defined(UNICOS5) */
} /* end of telrcv */