4.3BSD-Reno/src/usr.bin/telnet/telnet.c
/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* Neither the name of the University nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)telnet.c 5.50 (Berkeley) 6/28/90";
#endif /* not lint */
#include <sys/types.h>
#ifdef KERBEROS
#include <sys/socket.h>
#include <netinet/in.h>
#include <kerberosIV/des.h>
#include <kerberosIV/krb.h>
#include "krb4-proto.h"
#endif
#if defined(unix)
#include <signal.h>
/* By the way, we need to include curses.h before telnet.h since,
* among other things, telnet.h #defines 'DO', which is a variable
* declared in curses.h.
*/
#endif /* defined(unix) */
#include <arpa/telnet.h>
#if defined(unix)
#include <strings.h>
#else /* defined(unix) */
#include <string.h>
#endif /* defined(unix) */
#include <ctype.h>
#include "ring.h"
#include "defines.h"
#include "externs.h"
#include "types.h"
#include "general.h"
#define strip(x) ((x)&0x7f)
extern char *env_getvalue();
static char subbuffer[SUBBUFSIZE],
*subpointer, *subend; /* buffer for sub-options */
#define SB_CLEAR() subpointer = subbuffer;
#define SB_TERM() subend = subpointer;
#define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
*subpointer++ = (c); \
}
char options[256]; /* The combined options */
char do_dont_resp[256];
char will_wont_resp[256];
int
connected,
showoptions,
In3270, /* Are we in 3270 mode? */
ISend, /* trying to send network data in */
#ifdef KERBEROS
kerberized = 0, /* Are we using Kerberos authentication ? */
#endif
debug = 0,
crmod,
netdata, /* Print out network data flow */
crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
#if defined(TN3270)
noasynchtty = 0,/* User specified "-noasynch" on command line */
noasynchnet = 0,/* User specified "-noasynch" on command line */
askedSGA = 0, /* We have talked about suppress go ahead */
#endif /* defined(TN3270) */
telnetport,
SYNCHing, /* we are in TELNET SYNCH mode */
flushout, /* flush output */
autoflush = 0, /* flush output when interrupting? */
autosynch, /* send interrupt characters with SYNCH? */
localflow, /* we handle flow control locally */
localchars, /* we recognize interrupt/quit */
donelclchars, /* the user has set "localchars" */
donebinarytoggle, /* the user has put us in binary */
dontlecho, /* do we suppress local echoing right now? */
globalmode;
char *prompt = 0;
cc_t escape;
#ifdef KLUDGELINEMODE
cc_t echoc;
#endif
/*
* Telnet receiver states for fsm
*/
#define TS_DATA 0
#define TS_IAC 1
#define TS_WILL 2
#define TS_WONT 3
#define TS_DO 4
#define TS_DONT 5
#define TS_CR 6
#define TS_SB 7 /* sub-option collection */
#define TS_SE 8 /* looking for sub-option end */
static int telrcv_state;
jmp_buf toplevel = { 0 };
jmp_buf peerdied;
int flushline;
int linemode;
#ifdef KLUDGELINEMODE
int kludgelinemode = 1;
#endif
/*
* The following are some clocks used to decide how to interpret
* the relationship between various variables.
*/
Clocks clocks;
#ifdef notdef
Modelist modelist[] = {
{ "telnet command mode", COMMAND_LINE },
{ "character-at-a-time mode", 0 },
{ "character-at-a-time mode (local echo)", LOCAL_ECHO|LOCAL_CHARS },
{ "line-by-line mode (remote echo)", LINE | LOCAL_CHARS },
{ "line-by-line mode", LINE | LOCAL_ECHO | LOCAL_CHARS },
{ "line-by-line mode (local echoing suppressed)", LINE | LOCAL_CHARS },
{ "3270 mode", 0 },
};
#endif
/*
* Initialize telnet environment.
*/
init_telnet()
{
env_init();
SB_CLEAR();
ClearArray(options);
connected = In3270 = ISend = localflow = donebinarytoggle = 0;
SYNCHing = 0;
/* Don't change NetTrace */
escape = CONTROL(']');
#ifdef KLUDGELINEMODE
echoc = CONTROL('E');
#endif
flushline = 1;
telrcv_state = TS_DATA;
}
#ifdef notdef
#include <varargs.h>
/*VARARGS*/
static void
printring(va_alist)
va_dcl
{
va_list ap;
char buffer[100]; /* where things go */
char *ptr;
char *format;
char *string;
Ring *ring;
int i;
va_start(ap);
ring = va_arg(ap, Ring *);
format = va_arg(ap, char *);
ptr = buffer;
while ((i = *format++) != 0) {
if (i == '%') {
i = *format++;
switch (i) {
case 'c':
*ptr++ = va_arg(ap, int);
break;
case 's':
string = va_arg(ap, char *);
ring_supply_data(ring, buffer, ptr-buffer);
ring_supply_data(ring, string, strlen(string));
ptr = buffer;
break;
case 0:
ExitString("printring: trailing %%.\n", 1);
/*NOTREACHED*/
default:
ExitString("printring: unknown format character.\n", 1);
/*NOTREACHED*/
}
} else {
*ptr++ = i;
}
}
ring_supply_data(ring, buffer, ptr-buffer);
}
#endif
/*
* These routines are in charge of sending option negotiations
* to the other side.
*
* The basic idea is that we send the negotiation if either side
* is in disagreement as to what the current state should be.
*/
send_do(c, init)
register int c, init;
{
if (init) {
if (((do_dont_resp[c] == 0) && my_state_is_do(c)) ||
my_want_state_is_do(c))
return;
set_my_want_state_do(c);
do_dont_resp[c]++;
}
NET2ADD(IAC, DO);
NETADD(c);
printoption("SENT", "do", c);
}
void
send_dont(c, init)
register int c, init;
{
if (init) {
if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) ||
my_want_state_is_dont(c))
return;
set_my_want_state_dont(c);
do_dont_resp[c]++;
}
NET2ADD(IAC, DONT);
NETADD(c);
printoption("SENT", "dont", c);
}
void
send_will(c, init)
register int c, init;
{
if (init) {
if (((will_wont_resp[c] == 0) && my_state_is_will(c)) ||
my_want_state_is_will(c))
return;
set_my_want_state_will(c);
will_wont_resp[c]++;
}
NET2ADD(IAC, WILL);
NETADD(c);
printoption("SENT", "will", c);
}
void
send_wont(c, init)
register int c, init;
{
if (init) {
if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) ||
my_want_state_is_wont(c))
return;
set_my_want_state_wont(c);
will_wont_resp[c]++;
}
NET2ADD(IAC, WONT);
NETADD(c);
printoption("SENT", "wont", c);
}
void
willoption(option)
int option;
{
int new_state_ok = 0;
if (do_dont_resp[option]) {
--do_dont_resp[option];
if (do_dont_resp[option] && my_state_is_do(option))
--do_dont_resp[option];
}
if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) {
switch (option) {
case TELOPT_ECHO:
# if defined(TN3270)
/*
* The following is a pain in the rear-end.
* Various IBM servers (some versions of Wiscnet,
* possibly Fibronics/Spartacus, and who knows who
* else) will NOT allow us to send "DO SGA" too early
* in the setup proceedings. On the other hand,
* 4.2 servers (telnetd) won't set SGA correctly.
* So, we are stuck. Empirically (but, based on
* a VERY small sample), the IBM servers don't send
* out anything about ECHO, so we postpone our sending
* "DO SGA" until we see "WILL ECHO" (which 4.2 servers
* DO send).
*/
{
if (askedSGA == 0) {
askedSGA = 1;
if (my_want_state_is_dont(TELOPT_SGA))
send_do(TELOPT_SGA, 1);
}
}
/* Fall through */
case TELOPT_EOR:
#endif /* defined(TN3270) */
case TELOPT_BINARY:
case TELOPT_SGA:
settimer(modenegotiated);
/* FALL THROUGH */
case TELOPT_STATUS:
new_state_ok = 1;
break;
case TELOPT_TM:
if (flushout)
flushout = 0;
/*
* Special case for TM. If we get back a WILL,
* pretend we got back a WONT.
*/
set_my_want_state_dont(option);
set_my_state_dont(option);
return; /* Never reply to TM will's/wont's */
case TELOPT_LINEMODE:
default:
break;
}
if (new_state_ok) {
set_my_want_state_do(option);
send_do(option, 0);
setconnmode(0); /* possibly set new tty mode */
} else {
do_dont_resp[option]++;
send_dont(option, 0);
}
}
set_my_state_do(option);
}
void
wontoption(option)
int option;
{
if (do_dont_resp[option]) {
--do_dont_resp[option];
if (do_dont_resp[option] && my_state_is_dont(option))
--do_dont_resp[option];
}
if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) {
switch (option) {
#ifdef KLUDGELINEMODE
case TELOPT_SGA:
if (!kludgelinemode)
break;
/* FALL THROUGH */
#endif
case TELOPT_ECHO:
settimer(modenegotiated);
break;
case TELOPT_TM:
if (flushout)
flushout = 0;
set_my_want_state_dont(option);
set_my_state_dont(option);
return; /* Never reply to TM will's/wont's */
default:
break;
}
set_my_want_state_dont(option);
if (my_state_is_do(option))
send_dont(option, 0);
setconnmode(0); /* Set new tty mode */
} else if (option == TELOPT_TM) {
/*
* Special case for TM.
*/
if (flushout)
flushout = 0;
set_my_want_state_dont(option);
}
set_my_state_dont(option);
}
static void
dooption(option)
int option;
{
int new_state_ok = 0;
if (will_wont_resp[option]) {
--will_wont_resp[option];
if (will_wont_resp[option] && my_state_is_will(option))
--will_wont_resp[option];
}
if (will_wont_resp[option] == 0) {
if (my_want_state_is_wont(option)) {
switch (option) {
case TELOPT_TM:
/*
* Special case for TM. We send a WILL, but pretend
* we sent WONT.
*/
send_will(option, 0);
set_my_want_state_wont(TELOPT_TM);
set_my_state_wont(TELOPT_TM);
return;
#ifdef KERBEROS
case TELOPT_AUTHENTICATION:
if (kerberized)
new_state_ok = 1;
break;
#endif
# if defined(TN3270)
case TELOPT_EOR: /* end of record */
# endif /* defined(TN3270) */
case TELOPT_BINARY: /* binary mode */
case TELOPT_NAWS: /* window size */
case TELOPT_TSPEED: /* terminal speed */
case TELOPT_LFLOW: /* local flow control */
case TELOPT_TTYPE: /* terminal type option */
case TELOPT_SGA: /* no big deal */
case TELOPT_ENVIRON: /* environment variable option */
new_state_ok = 1;
break;
case TELOPT_XDISPLOC: /* X Display location */
if (env_getvalue("DISPLAY"))
new_state_ok = 1;
break;
case TELOPT_LINEMODE:
#ifdef KLUDGELINEMODE
kludgelinemode = 0;
send_do(TELOPT_SGA, 1);
#endif
set_my_want_state_will(TELOPT_LINEMODE);
send_will(option, 0);
set_my_state_will(TELOPT_LINEMODE);
slc_init();
return;
case TELOPT_ECHO: /* We're never going to echo... */
default:
break;
}
if (new_state_ok) {
set_my_want_state_will(option);
send_will(option, 0);
} else {
will_wont_resp[option]++;
send_wont(option, 0);
}
} else {
/*
* Handle options that need more things done after the
* other side has acknowledged the option.
*/
switch (option) {
case TELOPT_LINEMODE:
#ifdef KLUDGELINEMODE
kludgelinemode = 0;
send_do(TELOPT_SGA, 1);
#endif
set_my_state_will(option);
slc_init();
send_do(TELOPT_SGA, 0);
return;
}
}
}
set_my_state_will(option);
}
static void
dontoption(option)
int option;
{
if (will_wont_resp[option]) {
--will_wont_resp[option];
if (will_wont_resp[option] && my_state_is_wont(option))
--will_wont_resp[option];
}
if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) {
switch (option) {
case TELOPT_LINEMODE:
linemode = 0; /* put us back to the default state */
break;
}
/* we always accept a DONT */
set_my_want_state_wont(option);
if (my_state_is_will(option))
send_wont(option, 0);
setconnmode(0); /* Set new tty mode */
}
set_my_state_wont(option);
}
/*
* Given a buffer returned by tgetent(), this routine will turn
* the pipe seperated list of names in the buffer into an array
* of pointers to null terminated names. We toss out any bad,
* duplicate, or verbose names (names with spaces).
*/
static char *unknown[] = { "UNKNOWN", 0 };
char **
mklist(buf, name)
char *buf, *name;
{
register int n;
register char c, *cp, **argvp, *cp2, **argv;
char *malloc();
if (name) {
if (strlen(name) > 40)
name = 0;
else {
unknown[0] = name;
upcase(name);
}
}
/*
* Count up the number of names.
*/
for (n = 1, cp = buf; *cp && *cp != ':'; cp++) {
if (*cp == '|')
n++;
}
/*
* Allocate an array to put the name pointers into
*/
argv = (char **)malloc((n+3)*sizeof(char *));
if (argv == 0)
return(unknown);
/*
* Fill up the array of pointers to names.
*/
*argv = 0;
argvp = argv+1;
n = 0;
for (cp = cp2 = buf; (c = *cp); cp++) {
if (c == '|' || c == ':') {
*cp++ = '\0';
/*
* Skip entries that have spaces or are over 40
* characters long. If this is our environment
* name, then put it up front. Otherwise, as
* long as this is not a duplicate name (case
* insensitive) add it to the list.
*/
if (n || (cp - cp2 > 41))
;
else if (name && (strncasecmp(name, cp2, cp-cp2) == 0))
*argv = cp2;
else if (is_unique(cp2, argv+1, argvp))
*argvp++ = cp2;
if (c == ':')
break;
/*
* Skip multiple delimiters. Reset cp2 to
* the beginning of the next name. Reset n,
* the flag for names with spaces.
*/
while ((c = *cp) == '|')
cp++;
cp2 = cp;
n = 0;
}
/*
* Skip entries with spaces or non-ascii values.
* Convert lower case letters to upper case.
*/
if ((c == ' ') || !isascii(c))
n = 1;
else if (islower(c))
*cp = toupper(c);
}
/*
* Check for an old V6 2 character name. If the second
* name points to the beginning of the buffer, and is
* only 2 characters long, move it to the end of the array.
*/
if ((argv[1] == buf) && (strlen(argv[1]) == 2)) {
*argvp++ = buf;
cp = *argv++;
*argv = cp;
}
/*
* Duplicate last name, for TTYPE option, and null
* terminate the array. If we didn't find a match on
* our terminal name, put that name at the beginning.
*/
cp = *(argvp-1);
*argvp++ = cp;
*argvp = 0;
if (*argv == 0) {
if (name)
*argv = name;
else
argv++;
}
if (*argv)
return(argv);
else
return(unknown);
}
is_unique(name, as, ae)
register char *name, **as, **ae;
{
register char **ap;
register int n;
n = strlen(name) + 1;
for (ap = as; ap < ae; ap++)
if (strncasecmp(*ap, name, n) == 0)
return(0);
return (1);
}
#ifdef TERMCAP
char termbuf[1024];
/*ARGSUSED*/
setupterm(tname, fd, errp)
char *tname;
int fd, *errp;
{
if (tgetent(termbuf, tname) == 1) {
termbuf[1023] = '\0';
if (errp)
*errp = 1;
return(0);
}
if (errp)
*errp = 0;
return(-1);
}
#else
#define termbuf ttytype
extern char ttytype[];
#endif
char *
gettermname()
{
char *tname;
static int first = 1;
static char **tnamep;
static char **next;
int err;
if (first) {
first = 0;
if ((tname = env_getvalue("TERM")) &&
(setupterm(tname, 1, &err) == 0)) {
tnamep = mklist(termbuf, tname);
} else {
if (tname && (strlen(tname) <= 40)) {
unknown[0] = tname;
upcase(tname);
}
tnamep = unknown;
}
next = tnamep;
}
if (*next == 0)
next = tnamep;
return(*next++);
}
/*
* suboption()
*
* Look at the sub-option buffer, and try to be helpful to the other
* side.
*
* Currently we recognize:
*
* Terminal type, send request.
* Terminal speed (send request).
* Local flow control (is request).
* Linemode
*/
static void
suboption()
{
printsub('<', subbuffer, subend-subbuffer+2);
switch (subbuffer[0]&0xff) {
case TELOPT_TTYPE:
if (my_want_state_is_wont(TELOPT_TTYPE))
return;
if ((subbuffer[1]&0xff) != TELQUAL_SEND) {
;
} else {
char *name;
char temp[50];
int len;
#if defined(TN3270)
if (tn3270_ttype()) {
return;
}
#endif /* defined(TN3270) */
name = gettermname();
len = strlen(name) + 4 + 2;
if (len < NETROOM()) {
sprintf(temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE,
TELQUAL_IS, name, IAC, SE);
ring_supply_data(&netoring, temp, len);
printsub('>', &temp[2], len-2);
} else {
ExitString("No room in buffer for terminal type.\n", 1);
/*NOTREACHED*/
}
}
break;
case TELOPT_TSPEED:
if (my_want_state_is_wont(TELOPT_TSPEED))
return;
if ((subbuffer[1]&0xff) == TELQUAL_SEND) {
int ospeed, ispeed;
char temp[50];
int len;
TerminalSpeeds(&ispeed, &ospeed);
sprintf(temp, "%c%c%c%c%d,%d%c%c", IAC, SB, TELOPT_TSPEED,
TELQUAL_IS, ospeed, ispeed, IAC, SE);
len = strlen(temp+4) + 4; /* temp[3] is 0 ... */
if (len < NETROOM()) {
ring_supply_data(&netoring, temp, len);
printsub('>', temp+2, len - 2);
}
/*@*/ else printf("lm_will: not enough room in buffer\n");
}
break;
case TELOPT_LFLOW:
if (my_want_state_is_wont(TELOPT_LFLOW))
return;
if ((subbuffer[1]&0xff) == 1) {
localflow = 1;
} else if ((subbuffer[1]&0xff) == 0) {
localflow = 0;
}
setcommandmode();
setconnmode(0);
break;
case TELOPT_LINEMODE:
if (my_want_state_is_wont(TELOPT_LINEMODE))
return;
switch (subbuffer[1]&0xff) {
case WILL:
lm_will(&subbuffer[2], subend - &subbuffer[2]);
break;
case WONT:
lm_wont(&subbuffer[2], subend - &subbuffer[2]);
break;
case DO:
lm_do(&subbuffer[2], subend - &subbuffer[2]);
break;
case DONT:
lm_dont(&subbuffer[2], subend - &subbuffer[2]);
break;
case LM_SLC:
slc(&subbuffer[2], subend - &subbuffer[2]);
break;
case LM_MODE:
lm_mode(&subbuffer[2], subend - &subbuffer[2], 0);
break;
default:
break;
}
break;
case TELOPT_ENVIRON:
switch(subbuffer[1]&0xff) {
case TELQUAL_IS:
case TELQUAL_INFO:
if (my_want_state_is_dont(TELOPT_ENVIRON))
return;
break;
case TELQUAL_SEND:
if (my_want_state_is_wont(TELOPT_ENVIRON)) {
return;
}
break;
default:
return;
}
env_opt(&subbuffer[1], subend - &subbuffer[1]);
break;
case TELOPT_XDISPLOC:
if (my_want_state_is_wont(TELOPT_XDISPLOC))
return;
if ((subbuffer[1]&0xff) == TELQUAL_SEND) {
char temp[50], *dp;
int len;
if ((dp = env_getvalue("DISPLAY")) == NULL) {
/*
* Something happened, we no longer have a DISPLAY
* variable. So, turn off the option.
*/
send_wont(TELOPT_XDISPLOC, 1);
break;
}
sprintf(temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_XDISPLOC,
TELQUAL_IS, dp, IAC, SE);
len = strlen(temp+4) + 4; /* temp[3] is 0 ... */
if (len < NETROOM()) {
ring_supply_data(&netoring, temp, len);
printsub('>', temp+2, len - 2);
}
/*@*/ else printf("lm_will: not enough room in buffer\n");
}
break;
#ifdef KERBEROS
case TELOPT_AUTHENTICATION:
if ((subbuffer[1] & 0xff) == TELQUAL_SEND) {
register char *cp = &subbuffer[2];
char tmp[256];
int dokrb4 = 0, unknowntypes = 0, noresponse = 1;
while (cp < subend) {
switch (*cp) {
case TELQUAL_AUTHTYPE_KERBEROS_V4:
dokrb4 = 1;
break;
default:
unknowntypes++;
}
cp++;
}
if (noresponse && dokrb4) {
register unsigned char *ucp = (unsigned char *)cp;
char *krb_realm;
char hst_inst[INST_SZ];
KTEXT_ST authent_st;
int space = 0;
int retval;
extern char *krb_realmofhost(), *krb_get_phost();
fprintf(stderr,
"[Trying Kerberos V4 authentication]\n");
krb_realm = krb_get_phost(hostname);
bzero(hst_inst, sizeof(hst_inst));
if (krb_realm)
strncpy(hst_inst, krb_realm, sizeof(hst_inst));
hst_inst[sizeof(hst_inst)-1] = '\0';
if (!(krb_realm = krb_realmofhost(hst_inst))) {
fprintf(stderr, "no realm for %s\n", hostname);
goto cantsend4;
}
if (retval = krb_mk_req(&authent_st, "rcmd", hst_inst,
krb_realm, 0L)) {
fprintf(stderr, "mk_req failed: %s\n",
krb_err_txt[retval]);
goto cantsend4;
}
space = authent_st.length;
for (ucp = authent_st.dat; ucp < authent_st.dat +
authent_st.length; ucp++) {
if (*ucp == IAC)
space++;
}
if (NETROOM() < 6 + 1 + 2 +
space + 2) {
fprintf(stderr,
"no room to send V4 ticket/authenticator\n");
cantsend4:
if (7 < NETROOM()) {
printring(&netoring, "%c%c%c%c%c%c%c", IAC, SB,
TELOPT_AUTHENTICATION,
TELQUAL_IS, TELQUAL_AUTHTYPE_NONE, IAC, SE);
sprintf(tmp, "%c%c%c%c%c", TELOPT_AUTHENTICATION,
TELQUAL_IS, TELQUAL_AUTHTYPE_NONE, IAC, SE);
printsub(">", tmp, 4+2-2-2);
} else
exit(1);
} else {
#ifdef notdef
printring(&netoring, "%c%c%c%c%c%c", IAC, SB,
TELOPT_AUTHENTICATION,
TELQUAL_IS, TELQUAL_AUTHTYPE_KERBEROS,
TELQUAL_AUTHTYPE_KERBEROS_V4);
sprintf(tmp, "%c%c%c%c%c%c", TELOPT_AUTHENTICATION,
TELQUAL_IS, TELQUAL_AUTHTYPE_KERBEROS,
TELQUAL_AUTHTYPE_KERBEROS_V4, IAC, SE);
#else
printring(&netoring, "%c%c%c%c%c", IAC, SB,
TELOPT_AUTHENTICATION,
TELQUAL_IS,
TELQUAL_AUTHTYPE_KERBEROS_V4);
sprintf(tmp, "%c%c%c%c%c", TELOPT_AUTHENTICATION,
TELQUAL_IS,
TELQUAL_AUTHTYPE_KERBEROS_V4, IAC, SE);
#endif
printsub(">", tmp, 4+2-2-2);
ring_supply_bindata(&netoring,
(char *)authent_st.dat, authent_st.length, IAC);
printring(&netoring, "%c%c", IAC, SE);
}
noresponse = 0;
}
if (noresponse) {
if (NETROOM() < 7) {
ExitString("not enough room to reject unhandled authtype\n", 1);
} else {
fprintf(stderr,"[Sending empty auth info in response to request for %d unknown type(s):\n\t", unknowntypes);
#ifdef notdef
cp = &subbuffer[3];
#else
cp = &subbuffer[2];
#endif
while (cp < subend) {
switch (*cp) {
case TELQUAL_AUTHTYPE_KERBEROS_V4:
break;
default:
fprintf(stderr, "%d,", *cp);
break;
}
cp++;
}
fputs("]\n", stderr);
printring(&netoring, "%c%c%c%c%c%c%c", IAC, SB,
TELOPT_AUTHENTICATION,
TELQUAL_IS, TELQUAL_AUTHTYPE_NONE, IAC, SE);
}
}
}
break;
#endif /* KERBEROS */
default:
break;
}
}
static char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE };
lm_will(cmd, len)
char *cmd;
{
if (len < 1) {
/*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */
return;
}
switch(cmd[0]) {
case LM_FORWARDMASK: /* We shouldn't ever get this... */
default:
str_lm[3] = DONT;
str_lm[4] = cmd[0];
if (NETROOM() > sizeof(str_lm)) {
ring_supply_data(&netoring, str_lm, sizeof(str_lm));
printsub('>', &str_lm[2], sizeof(str_lm)-2);
}
/*@*/ else printf("lm_will: not enough room in buffer\n");
break;
}
}
lm_wont(cmd, len)
char *cmd;
{
if (len < 1) {
/*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */
return;
}
switch(cmd[0]) {
case LM_FORWARDMASK: /* We shouldn't ever get this... */
default:
/* We are always DONT, so don't respond */
return;
}
}
lm_do(cmd, len)
char *cmd;
{
if (len < 1) {
/*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */
return;
}
switch(cmd[0]) {
case LM_FORWARDMASK:
default:
str_lm[3] = WONT;
str_lm[4] = cmd[0];
if (NETROOM() > sizeof(str_lm)) {
ring_supply_data(&netoring, str_lm, sizeof(str_lm));
printsub('>', &str_lm[2], sizeof(str_lm)-2);
}
/*@*/ else printf("lm_do: not enough room in buffer\n");
break;
}
}
lm_dont(cmd, len)
char *cmd;
{
if (len < 1) {
/*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */
return;
}
switch(cmd[0]) {
case LM_FORWARDMASK:
default:
/* we are always WONT, so don't respond */
break;
}
}
static char str_lm_mode[] = { IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE };
lm_mode(cmd, len, init)
char *cmd;
int len, init;
{
if (len != 1)
return;
if ((linemode&MODE_MASK&~MODE_ACK) == *cmd)
return;
if (*cmd&MODE_ACK)
return;
linemode = *cmd&(MODE_MASK&~MODE_ACK);
str_lm_mode[4] = linemode;
if (!init)
str_lm_mode[4] |= MODE_ACK;
if (NETROOM() > sizeof(str_lm_mode)) {
ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode));
printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2);
}
/*@*/ else printf("lm_mode: not enough room in buffer\n");
setconnmode(0); /* set changed mode */
}
/*
* slc()
* Handle special character suboption of LINEMODE.
*/
struct spc {
cc_t val;
cc_t *valp;
char flags; /* Current flags & level */
char mylevel; /* Maximum level & flags */
} spc_data[NSLC+1];
#define SLC_IMPORT 0
#define SLC_EXPORT 1
#define SLC_RVALUE 2
static int slc_mode = SLC_EXPORT;
slc_init()
{
register struct spc *spcp;
extern cc_t *tcval();
localchars = 1;
for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) {
spcp->val = 0;
spcp->valp = 0;
spcp->flags = spcp->mylevel = SLC_NOSUPPORT;
}
#define initfunc(func, flags) { \
spcp = &spc_data[func]; \
if (spcp->valp = tcval(func)) { \
spcp->val = *spcp->valp; \
spcp->mylevel = SLC_VARIABLE|flags; \
} else { \
spcp->val = 0; \
spcp->mylevel = SLC_DEFAULT; \
} \
}
initfunc(SLC_SYNCH, 0);
/* No BRK */
initfunc(SLC_AO, 0);
initfunc(SLC_AYT, 0);
/* No EOR */
initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT);
initfunc(SLC_EOF, 0);
#ifndef SYSV_TERMIO
initfunc(SLC_SUSP, SLC_FLUSHIN);
#endif
initfunc(SLC_EC, 0);
initfunc(SLC_EL, 0);
#ifndef SYSV_TERMIO
initfunc(SLC_EW, 0);
initfunc(SLC_RP, 0);
initfunc(SLC_LNEXT, 0);
#endif
initfunc(SLC_XON, 0);
initfunc(SLC_XOFF, 0);
#ifdef SYSV_TERMIO
spc_data[SLC_XON].mylevel = SLC_CANTCHANGE;
spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE;
#endif
initfunc(SLC_FORW1, 0);
#ifdef USE_TERMIO
initfunc(SLC_FORW2, 0);
/* No FORW2 */
#endif
initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT);
#undef initfunc
if (slc_mode == SLC_EXPORT)
slc_export();
else
slc_import(1);
}
slcstate()
{
printf("Special characters are %s values\n",
slc_mode == SLC_IMPORT ? "remote default" :
slc_mode == SLC_EXPORT ? "local" :
"remote");
}
slc_mode_export()
{
slc_mode = SLC_EXPORT;
if (my_state_is_will(TELOPT_LINEMODE))
slc_export();
}
slc_mode_import(def)
{
slc_mode = def ? SLC_IMPORT : SLC_RVALUE;
if (my_state_is_will(TELOPT_LINEMODE))
slc_import(def);
}
char slc_import_val[] = {
IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE
};
char slc_import_def[] = {
IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE
};
slc_import(def)
int def;
{
if (NETROOM() > sizeof(slc_import_val)) {
if (def) {
ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def));
printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2);
} else {
ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val));
printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2);
}
}
/*@*/ else printf("slc_import: not enough room\n");
}
slc_export()
{
register struct spc *spcp;
TerminalDefaultChars();
slc_start_reply();
for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
if (spcp->mylevel != SLC_NOSUPPORT) {
spcp->flags = spcp->mylevel;
if (spcp->valp)
spcp->val = *spcp->valp;
slc_add_reply(spcp - spc_data, spcp->mylevel, spcp->val);
}
}
slc_end_reply();
if (slc_update())
setconnmode(1); /* set the new character values */
}
slc(cp, len)
register char *cp;
int len;
{
register struct spc *spcp;
register int func,level;
slc_start_reply();
for (; len >= 3; len -=3, cp +=3) {
func = cp[SLC_FUNC];
if (func == 0) {
/*
* Client side: always ignore 0 function.
*/
continue;
}
if (func > NSLC) {
if (cp[SLC_FLAGS] & SLC_LEVELBITS != SLC_NOSUPPORT)
slc_add_reply(func, SLC_NOSUPPORT, 0);
continue;
}
spcp = &spc_data[func];
level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK);
if ((cp[SLC_VALUE] == (unsigned char)spcp->val) &&
((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) {
continue;
}
if (level == (SLC_DEFAULT|SLC_ACK)) {
/*
* This is an error condition, the SLC_ACK
* bit should never be set for the SLC_DEFAULT
* level. Our best guess to recover is to
* ignore the SLC_ACK bit.
*/
cp[SLC_FLAGS] &= ~SLC_ACK;
}
if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) {
spcp->val = (cc_t)cp[SLC_VALUE];
spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */
continue;
}
level &= ~SLC_ACK;
if (level <= (spcp->mylevel&SLC_LEVELBITS)) {
spcp->flags = cp[SLC_FLAGS]|SLC_ACK;
spcp->val = (cc_t)cp[SLC_VALUE];
}
if (level == SLC_DEFAULT) {
if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT)
spcp->flags = spcp->mylevel;
else
spcp->flags = SLC_NOSUPPORT;
}
slc_add_reply(func, spcp->flags, spcp->val);
}
slc_end_reply();
if (slc_update())
setconnmode(1); /* set the new character values */
}
slc_check()
{
register struct spc *spcp;
slc_start_reply();
for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
if (spcp->valp && spcp->val != *spcp->valp) {
spcp->val = *spcp->valp;
slc_add_reply(spcp - spc_data, spcp->mylevel, spcp->val);
}
}
slc_end_reply();
setconnmode(1);
}
unsigned char slc_reply[128];
unsigned char *slc_replyp;
slc_start_reply()
{
slc_replyp = slc_reply;
*slc_replyp++ = IAC;
*slc_replyp++ = SB;
*slc_replyp++ = TELOPT_LINEMODE;
*slc_replyp++ = LM_SLC;
}
slc_add_reply(func, flags, value)
char func;
char flags;
cc_t value;
{
if ((*slc_replyp++ = func) == IAC)
*slc_replyp++ = IAC;
if ((*slc_replyp++ = flags) == IAC)
*slc_replyp++ = IAC;
if ((*slc_replyp++ = (unsigned char)value) == IAC)
*slc_replyp++ = IAC;
}
slc_end_reply()
{
register int len;
*slc_replyp++ = IAC;
*slc_replyp++ = SE;
len = slc_replyp - slc_reply;
if (len <= 6)
return;
if (NETROOM() > len) {
ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply);
printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2);
}
/*@*/else printf("slc_end_reply: not enough room\n");
}
slc_update()
{
register struct spc *spcp;
int need_update = 0;
for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
if (!(spcp->flags&SLC_ACK))
continue;
spcp->flags &= ~SLC_ACK;
if (spcp->valp && (*spcp->valp != spcp->val)) {
*spcp->valp = spcp->val;
need_update = 1;
}
}
return(need_update);
}
env_opt(buf, len)
register char *buf;
register int len;
{
register char *ep = 0, *epc = 0;
register int i;
switch(buf[0]) {
case TELQUAL_SEND:
env_opt_start();
if (len == 1) {
env_opt_add(NULL);
} else for (i = 1; i < len; i++) {
switch (buf[i]) {
case ENV_VALUE:
if (ep) {
*epc = 0;
env_opt_add(ep);
}
ep = epc = &buf[i+1];
break;
case ENV_ESC:
i++;
/*FALL THROUGH*/
default:
if (epc)
*epc++ = buf[i];
break;
}
if (ep) {
*epc = 0;
env_opt_add(ep);
}
}
env_opt_end(1);
break;
case TELQUAL_IS:
case TELQUAL_INFO:
/* Ignore for now. We shouldn't get it anyway. */
break;
default:
break;
}
}
#define OPT_REPLY_SIZE 256
unsigned char *opt_reply;
unsigned char *opt_replyp;
unsigned char *opt_replyend;
env_opt_start()
{
extern char *realloc();
extern char *malloc();
if (opt_reply)
opt_reply = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE);
else
opt_reply = (unsigned char *)malloc(OPT_REPLY_SIZE);
if (opt_reply == NULL) {
/*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n");
opt_reply = opt_replyp = opt_replyend = NULL;
return;
}
opt_replyp = opt_reply;
opt_replyend = opt_reply + OPT_REPLY_SIZE;
*opt_replyp++ = IAC;
*opt_replyp++ = SB;
*opt_replyp++ = TELOPT_ENVIRON;
*opt_replyp++ = TELQUAL_IS;
}
env_opt_start_info()
{
env_opt_start();
if (opt_replyp)
opt_replyp[-1] = TELQUAL_INFO;
}
env_opt_add(ep)
register char *ep;
{
register char *vp, c;
extern char *realloc();
extern char *env_default();
if (opt_reply == NULL) /*XXX*/
return; /*XXX*/
if (ep == NULL || *ep == '\0') {
env_default(1);
while (ep = env_default(0))
env_opt_add(ep);
return;
}
vp = env_getvalue(ep);
if (opt_replyp + (vp?strlen(vp):0) + strlen(ep) + 6 > opt_replyend) {
register int len;
opt_replyend += OPT_REPLY_SIZE;
len = opt_replyend - opt_reply;
opt_reply = (unsigned char *)realloc(opt_reply, len);
if (opt_reply == NULL) {
/*@*/ printf("env_opt_add: realloc() failed!!!\n");
opt_reply = opt_replyp = opt_replyend = NULL;
return;
}
opt_replyp = opt_reply + len - (opt_replyend - opt_replyp);
opt_replyend = opt_reply + len;
}
*opt_replyp++ = ENV_VAR;
for (;;) {
while (c = *ep++) {
switch(c) {
case IAC:
*opt_replyp++ = IAC;
break;
case ENV_VALUE:
case ENV_VAR:
case ENV_ESC:
*opt_replyp++ = ENV_ESC;
break;
}
*opt_replyp++ = c;
}
if (ep = vp) {
*opt_replyp++ = ENV_VALUE;
vp = NULL;
} else
break;
}
}
env_opt_end(emptyok)
register int emptyok;
{
register int len;
len = opt_replyp - opt_reply + 2;
if (emptyok || len > 6) {
*opt_replyp++ = IAC;
*opt_replyp++ = SE;
if (NETROOM() > len) {
ring_supply_data(&netoring, opt_reply, len);
printsub('>', &opt_reply[2], len - 2);
}
/*@*/ else printf("slc_end_reply: not enough room\n");
}
if (opt_reply) {
free(opt_reply);
opt_reply = opt_replyp = opt_replyend = NULL;
}
}
int
telrcv()
{
register int c;
register int scc;
register char *sbp;
int count;
int returnValue = 0;
scc = 0;
count = 0;
while (TTYROOM() > 2) {
if (scc == 0) {
if (count) {
ring_consumed(&netiring, count);
returnValue = 1;
count = 0;
}
sbp = netiring.consume;
scc = ring_full_consecutive(&netiring);
if (scc == 0) {
/* No more data coming in */
break;
}
}
c = *sbp++ & 0xff, scc--; count++;
switch (telrcv_state) {
case TS_CR:
telrcv_state = TS_DATA;
if (c == '\0') {
break; /* Ignore \0 after CR */
}
else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) {
TTYADD(c);
break;
}
/* Else, fall through */
case TS_DATA:
if (c == IAC) {
telrcv_state = TS_IAC;
break;
}
# if defined(TN3270)
if (In3270) {
*Ifrontp++ = c;
while (scc > 0) {
c = *sbp++ & 0377, scc--; count++;
if (c == IAC) {
telrcv_state = TS_IAC;
break;
}
*Ifrontp++ = c;
}
} else
# endif /* defined(TN3270) */
/*
* The 'crmod' hack (see following) is needed
* since we can't * set CRMOD on output only.
* Machines like MULTICS like to send \r without
* \n; since we must turn off CRMOD to get proper
* input, the mapping is done here (sigh).
*/
if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) {
if (scc > 0) {
c = *sbp&0xff;
if (c == 0) {
sbp++, scc--; count++;
/* a "true" CR */
TTYADD('\r');
} else if (my_want_state_is_dont(TELOPT_ECHO) &&
(c == '\n')) {
sbp++, scc--; count++;
TTYADD('\n');
} else {
TTYADD('\r');
if (crmod) {
TTYADD('\n');
}
}
} else {
telrcv_state = TS_CR;
TTYADD('\r');
if (crmod) {
TTYADD('\n');
}
}
} else {
TTYADD(c);
}
continue;
case TS_IAC:
process_iac:
switch (c) {
case WILL:
telrcv_state = TS_WILL;
continue;
case WONT:
telrcv_state = TS_WONT;
continue;
case DO:
telrcv_state = TS_DO;
continue;
case DONT:
telrcv_state = TS_DONT;
continue;
case DM:
/*
* We may have missed an urgent notification,
* so make sure we flush whatever is in the
* buffer currently.
*/
SYNCHing = 1;
(void) ttyflush(1);
SYNCHing = stilloob();
settimer(gotDM);
break;
case SB:
SB_CLEAR();
telrcv_state = TS_SB;
printoption("RCVD", "IAC", SB);
continue;
# if defined(TN3270)
case EOR:
if (In3270) {
if (Ibackp == Ifrontp) {
Ibackp = Ifrontp = Ibuf;
ISend = 0; /* should have been! */
} else {
Ibackp += DataFromNetwork(Ibackp, Ifrontp-Ibackp, 1);
ISend = 1;
}
}
break;
# endif /* defined(TN3270) */
case IAC:
# if !defined(TN3270)
TTYADD(IAC);
# else /* !defined(TN3270) */
if (In3270) {
*Ifrontp++ = IAC;
} else {
TTYADD(IAC);
}
# endif /* !defined(TN3270) */
break;
case NOP:
case GA:
default:
printoption("RCVD", "IAC", c);
break;
}
telrcv_state = TS_DATA;
continue;
case TS_WILL:
printoption("RCVD", "will", c);
willoption(c);
SetIn3270();
telrcv_state = TS_DATA;
continue;
case TS_WONT:
printoption("RCVD", "wont", c);
wontoption(c);
SetIn3270();
telrcv_state = TS_DATA;
continue;
case TS_DO:
printoption("RCVD", "do", c);
dooption(c);
SetIn3270();
if (c == TELOPT_NAWS) {
sendnaws();
} else if (c == TELOPT_LFLOW) {
localflow = 1;
setcommandmode();
setconnmode(0);
}
telrcv_state = TS_DATA;
continue;
case TS_DONT:
printoption("RCVD", "dont", c);
dontoption(c);
flushline = 1;
setconnmode(0); /* set new tty mode (maybe) */
SetIn3270();
telrcv_state = TS_DATA;
continue;
case TS_SB:
if (c == IAC) {
telrcv_state = TS_SE;
} else {
SB_ACCUM(c);
}
continue;
case TS_SE:
if (c != SE) {
if (c != IAC) {
/*
* This is an error. We only expect to get
* "IAC IAC" or "IAC SE". Several things may
* have happend. An IAC was not doubled, the
* IAC SE was left off, or another option got
* inserted into the suboption are all possibilities.
* If we assume that the IAC was not doubled,
* and really the IAC SE was left off, we could
* get into an infinate loop here. So, instead,
* we terminate the suboption, and process the
* partial suboption if we can.
*/
SB_TERM();
SB_ACCUM(IAC);
SB_ACCUM(c);
printoption("In SUBOPTION processing, RCVD", "IAC", c);
suboption(); /* handle sub-option */
SetIn3270();
telrcv_state = TS_IAC;
goto process_iac;
}
SB_ACCUM(c);
telrcv_state = TS_SB;
} else {
SB_TERM();
SB_ACCUM(IAC);
SB_ACCUM(SE);
suboption(); /* handle sub-option */
SetIn3270();
telrcv_state = TS_DATA;
}
}
}
if (count)
ring_consumed(&netiring, count);
return returnValue||count;
}
static int
telsnd()
{
int tcc;
int count;
int returnValue = 0;
char *tbp;
tcc = 0;
count = 0;
while (NETROOM() > 2) {
register int sc;
register int c;
if (tcc == 0) {
if (count) {
ring_consumed(&ttyiring, count);
returnValue = 1;
count = 0;
}
tbp = ttyiring.consume;
tcc = ring_full_consecutive(&ttyiring);
if (tcc == 0) {
break;
}
}
c = *tbp++ & 0xff, sc = strip(c), tcc--; count++;
if (sc == escape) {
/*
* Double escape is a pass through of a single escape character.
*/
if (tcc && strip(*tbp) == escape) {
tbp++;
tcc--;
count++;
} else {
command(0, tbp, tcc);
count += tcc;
tcc = 0;
flushline = 1;
break;
}
}
#ifdef KLUDGELINEMODE
if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) {
if (tcc > 0 && strip(*tbp) == echoc) {
tcc--; tbp++; count++;
} else {
dontlecho = !dontlecho;
settimer(echotoggle);
setconnmode(0);
flushline = 1;
break;
}
}
#endif
if (MODE_LOCAL_CHARS(globalmode)) {
if (TerminalSpecialChars(sc) == 0) {
break;
}
}
if (my_want_state_is_wont(TELOPT_BINARY)) {
switch (c) {
case '\n':
/*
* If we are in CRMOD mode (\r ==> \n)
* on our local machine, then probably
* a newline (unix) is CRLF (TELNET).
*/
if (MODE_LOCAL_CHARS(globalmode)) {
NETADD('\r');
}
NETADD('\n');
flushline = 1;
break;
case '\r':
if (!crlf) {
NET2ADD('\r', '\0');
} else {
NET2ADD('\r', '\n');
}
flushline = 1;
break;
case IAC:
NET2ADD(IAC, IAC);
break;
default:
NETADD(c);
break;
}
} else if (c == IAC) {
NET2ADD(IAC, IAC);
} else {
NETADD(c);
}
}
if (count)
ring_consumed(&ttyiring, count);
return returnValue||count; /* Non-zero if we did anything */
}
/*
* Scheduler()
*
* Try to do something.
*
* If we do something useful, return 1; else return 0.
*
*/
int
Scheduler(block)
int block; /* should we block in the select ? */
{
/* One wants to be a bit careful about setting returnValue
* to one, since a one implies we did some useful work,
* and therefore probably won't be called to block next
* time (TN3270 mode only).
*/
int returnValue;
int netin, netout, netex, ttyin, ttyout;
/* Decide which rings should be processed */
netout = ring_full_count(&netoring) &&
(flushline ||
(my_want_state_is_wont(TELOPT_LINEMODE)
#ifdef KLUDGELINEMODE
&& (!kludgelinemode || my_want_state_is_do(TELOPT_SGA))
#endif
) ||
my_want_state_is_will(TELOPT_BINARY));
ttyout = ring_full_count(&ttyoring);
#if defined(TN3270)
ttyin = ring_empty_count(&ttyiring) && (shell_active == 0);
#else /* defined(TN3270) */
ttyin = ring_empty_count(&ttyiring);
#endif /* defined(TN3270) */
#if defined(TN3270)
netin = ring_empty_count(&netiring);
# else /* !defined(TN3270) */
netin = !ISend && ring_empty_count(&netiring);
# endif /* !defined(TN3270) */
netex = !SYNCHing;
/* If we have seen a signal recently, reset things */
# if defined(TN3270) && defined(unix)
if (HaveInput) {
HaveInput = 0;
(void) signal(SIGIO, inputAvailable);
}
#endif /* defined(TN3270) && defined(unix) */
/* Call to system code to process rings */
returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block);
/* Now, look at the input rings, looking for work to do. */
if (ring_full_count(&ttyiring)) {
# if defined(TN3270)
if (In3270) {
int c;
c = DataFromTerminal(ttyiring.consume,
ring_full_consecutive(&ttyiring));
if (c) {
returnValue = 1;
ring_consumed(&ttyiring, c);
}
} else {
# endif /* defined(TN3270) */
returnValue |= telsnd();
# if defined(TN3270)
}
# endif /* defined(TN3270) */
}
if (ring_full_count(&netiring)) {
# if !defined(TN3270)
returnValue |= telrcv();
# else /* !defined(TN3270) */
returnValue = Push3270();
# endif /* !defined(TN3270) */
}
return returnValue;
}
/*
* Select from tty and network...
*/
void
telnet()
{
sys_telnet_init();
# if !defined(TN3270)
if (telnetport) {
send_do(TELOPT_SGA, 1);
send_will(TELOPT_TTYPE, 1);
send_will(TELOPT_NAWS, 1);
send_will(TELOPT_TSPEED, 1);
send_will(TELOPT_LFLOW, 1);
send_will(TELOPT_LINEMODE, 1);
#ifdef KERBEROS
if (kerberized)
send_will(TELOPT_AUTHENTICATION, 1);
#endif
send_do(TELOPT_STATUS, 1);
if (env_getvalue("DISPLAY"))
send_will(TELOPT_XDISPLOC, 1);
send_will(TELOPT_ENVIRON, 1);
}
# endif /* !defined(TN3270) */
# if !defined(TN3270)
for (;;) {
int schedValue;
while ((schedValue = Scheduler(0)) != 0) {
if (schedValue == -1) {
setcommandmode();
return;
}
}
if (Scheduler(1) == -1) {
setcommandmode();
return;
}
}
# else /* !defined(TN3270) */
for (;;) {
int schedValue;
while (!In3270 && !shell_active) {
if (Scheduler(1) == -1) {
setcommandmode();
return;
}
}
while ((schedValue = Scheduler(0)) != 0) {
if (schedValue == -1) {
setcommandmode();
return;
}
}
/* If there is data waiting to go out to terminal, don't
* schedule any more data for the terminal.
*/
if (ring_full_count(&ttyoring)) {
schedValue = 1;
} else {
if (shell_active) {
if (shell_continue() == 0) {
ConnectScreen();
}
} else if (In3270) {
schedValue = DoTerminalOutput();
}
}
if (schedValue && (shell_active == 0)) {
if (Scheduler(1) == -1) {
setcommandmode();
return;
}
}
}
# endif /* !defined(TN3270) */
}
#if 0 /* XXX - this not being in is a bug */
/*
* nextitem()
*
* Return the address of the next "item" in the TELNET data
* stream. This will be the address of the next character if
* the current address is a user data character, or it will
* be the address of the character following the TELNET command
* if the current address is a TELNET IAC ("I Am a Command")
* character.
*/
static char *
nextitem(current)
char *current;
{
if ((*current&0xff) != IAC) {
return current+1;
}
switch (*(current+1)&0xff) {
case DO:
case DONT:
case WILL:
case WONT:
return current+3;
case SB: /* loop forever looking for the SE */
{
register char *look = current+2;
for (;;) {
if ((*look++&0xff) == IAC) {
if ((*look++&0xff) == SE) {
return look;
}
}
}
}
default:
return current+2;
}
}
#endif /* 0 */
/*
* netclear()
*
* We are about to do a TELNET SYNCH operation. Clear
* the path to the network.
*
* Things are a bit tricky since we may have sent the first
* byte or so of a previous TELNET command into the network.
* So, we have to scan the network buffer from the beginning
* until we are up to where we want to be.
*
* A side effect of what we do, just to keep things
* simple, is to clear the urgent data pointer. The principal
* caller should be setting the urgent data pointer AFTER calling
* us in any case.
*/
static void
netclear()
{
#if 0 /* XXX */
register char *thisitem, *next;
char *good;
#define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \
((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
thisitem = netobuf;
while ((next = nextitem(thisitem)) <= netobuf.send) {
thisitem = next;
}
/* Now, thisitem is first before/at boundary. */
good = netobuf; /* where the good bytes go */
while (netoring.add > thisitem) {
if (wewant(thisitem)) {
int length;
next = thisitem;
do {
next = nextitem(next);
} while (wewant(next) && (nfrontp > next));
length = next-thisitem;
memcpy(good, thisitem, length);
good += length;
thisitem = next;
} else {
thisitem = nextitem(thisitem);
}
}
#endif /* 0 */
}
/*
* These routines add various telnet commands to the data stream.
*/
static void
doflush()
{
NET2ADD(IAC, DO);
NETADD(TELOPT_TM);
flushline = 1;
flushout = 1;
(void) ttyflush(1); /* Flush/drop output */
/* do printoption AFTER flush, otherwise the output gets tossed... */
printoption("SENT", "do", TELOPT_TM);
}
void
xmitAO()
{
NET2ADD(IAC, AO);
printoption("SENT", "IAC", AO);
if (autoflush) {
doflush();
}
}
void
xmitEL()
{
NET2ADD(IAC, EL);
printoption("SENT", "IAC", EL);
}
void
xmitEC()
{
NET2ADD(IAC, EC);
printoption("SENT", "IAC", EC);
}
#if defined(NOT43)
int
#else /* defined(NOT43) */
void
#endif /* defined(NOT43) */
dosynch()
{
netclear(); /* clear the path to the network */
NETADD(IAC);
setneturg();
NETADD(DM);
printoption("SENT", "IAC", DM);
#if defined(NOT43)
return 0;
#endif /* defined(NOT43) */
}
void
get_status()
{
char tmp[16];
register char *cp;
if (my_want_state_is_dont(TELOPT_STATUS)) {
printf("Remote side does not support STATUS option\n");
return;
}
if (!showoptions)
printf("You will not see the response unless you set \"options\"\n");
cp = tmp;
*cp++ = IAC;
*cp++ = SB;
*cp++ = TELOPT_STATUS;
*cp++ = TELQUAL_SEND;
*cp++ = IAC;
*cp++ = SE;
if (NETROOM() >= cp - tmp) {
ring_supply_data(&netoring, tmp, cp-tmp);
printsub('>', tmp+2, cp - tmp - 2);
}
}
void
intp()
{
NET2ADD(IAC, IP);
printoption("SENT", "IAC", IP);
flushline = 1;
if (autoflush) {
doflush();
}
if (autosynch) {
dosynch();
}
}
void
sendbrk()
{
NET2ADD(IAC, BREAK);
printoption("SENT", "IAC", BREAK);
flushline = 1;
if (autoflush) {
doflush();
}
if (autosynch) {
dosynch();
}
}
void
sendabort()
{
NET2ADD(IAC, ABORT);
printoption("SENT", "IAC", ABORT);
flushline = 1;
if (autoflush) {
doflush();
}
if (autosynch) {
dosynch();
}
}
void
sendsusp()
{
NET2ADD(IAC, SUSP);
printoption("SENT", "IAC", SUSP);
flushline = 1;
if (autoflush) {
doflush();
}
if (autosynch) {
dosynch();
}
}
void
sendeof()
{
NET2ADD(IAC, xEOF);
printoption("SENT", "IAC", xEOF);
}
/*
* Send a window size update to the remote system.
*/
void
sendnaws()
{
long rows, cols;
unsigned char tmp[16];
register unsigned char *cp;
if (my_state_is_wont(TELOPT_NAWS))
return;
#define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \
if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; }
if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */
return;
}
cp = tmp;
*cp++ = IAC;
*cp++ = SB;
*cp++ = TELOPT_NAWS;
PUTSHORT(cp, cols);
PUTSHORT(cp, rows);
*cp++ = IAC;
*cp++ = SE;
if (NETROOM() >= cp - tmp) {
ring_supply_data(&netoring, tmp, cp-tmp);
printsub('>', tmp+2, cp - tmp - 2);
}
}
tel_enter_binary(rw)
int rw;
{
if (rw&1)
send_do(TELOPT_BINARY, 1);
if (rw&2)
send_will(TELOPT_BINARY, 1);
}
tel_leave_binary(rw)
int rw;
{
if (rw&1)
send_dont(TELOPT_BINARY, 1);
if (rw&2)
send_wont(TELOPT_BINARY, 1);
}