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inetutils/telnet/telnet.c
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/*
Copyright (C) 1995-2025 Free Software Foundation, Inc.
This file is part of GNU Inetutils.
GNU Inetutils is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Inetutils is distributed in the hope that 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, see `http://www.gnu.org/licenses/'. */
/*
* Copyright (c) 1988, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <sys/types.h>
#if defined unix || defined __unix || 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 /* unix || __unix || __unix__ */
#include <arpa/telnet.h>
#include <ctype.h>
#include <stdlib.h>
#include <libinetutils.h>
#include "ring.h"
#include "defines.h"
#include "externs.h"
#include "types.h"
#include "general.h"
#ifdef HAVE_TERMCAP_TGETENT
# include <termcap.h>
#elif defined HAVE_CURSES_TGETENT
# include <curses.h>
# ifndef _XOPEN_CURSES
# include <term.h>
# endif
#endif
#ifdef AUTHENTICATION
# include <libtelnet/auth.h>
#endif
#ifdef ENCRYPTION
# include <libtelnet/encrypt.h>
#endif
#if defined AUTHENTICATION || defined ENCRYPTION
# include <libtelnet/misc.h>
#endif
#define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x))
static unsigned char subbuffer[SUBBUFSIZE], *subpointer, *subend; /* buffer for sub-options */
#define SB_CLEAR() subpointer = subbuffer;
#define SB_TERM() { subend = subpointer; SB_CLEAR(); }
#define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
*subpointer++ = (c); \
}
#define SB_GET() ((*subpointer++)&0xff)
#define SB_PEEK() ((*subpointer)&0xff)
#define SB_EOF() (subpointer >= subend)
#define SB_LEN() (subend - subpointer)
char options[256] = { 0 }; /* The combined options */
char do_dont_resp[256] = { 0 };
char will_wont_resp[256] = { 0 };
int eight = 0, autologin = 0, /* Autologin anyone? */
skiprc = 0, connected, showoptions, In3270, /* Are we in 3270 mode? */
ISend, /* trying to send network data in */
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 */
restartany, /* if flow control enabled, restart on any character */
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;
cc_t rlogin;
#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;
#ifdef OLD_ENVIRON
unsigned char telopt_environ = TELOPT_NEW_ENVIRON;
#else
# define telopt_environ TELOPT_NEW_ENVIRON
#endif
jmp_buf toplevel;
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;
/*
* Initialize telnet environment.
*/
void
init_telnet (void)
{
env_init ();
SB_CLEAR ();
connected = In3270 = ISend = localflow = donebinarytoggle = 0;
#if defined AUTHENTICATION || defined ENCRYPTION
auth_encrypt_connect (connected);
#endif /* defined(AUTHENTICATION) || defined(ENCRYPTION) */
restartany = -1;
SYNCHing = 0;
/* Don't change NetTrace */
escape = CONTROL (']');
rlogin = _POSIX_VDISABLE;
#ifdef KLUDGELINEMODE
echoc = CONTROL ('E');
#endif
flushline = 1;
telrcv_state = TS_DATA;
}
/*
* 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.
*/
void
send_do (int c, int 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 (int c, int 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 (int c, int 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 (int c, int 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 (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:
#if defined AUTHENTICATION
case TELOPT_AUTHENTICATION:
#endif
#ifdef ENCRYPTION
case TELOPT_ENCRYPT:
#endif /* ENCRYPTION */
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);
#ifdef ENCRYPTION
if (option == TELOPT_ENCRYPT)
encrypt_send_support ();
#endif /* ENCRYPTION */
}
void
wontoption (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 (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;
#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 */
#ifdef ENCRYPTION
case TELOPT_ENCRYPT: /* encryption variable option */
#endif /* ENCRYPTION */
new_state_ok = 1;
break;
case TELOPT_NEW_ENVIRON: /* New environment variable option */
#ifdef OLD_ENVIRON
if (my_state_is_will (TELOPT_OLD_ENVIRON))
send_wont (TELOPT_OLD_ENVIRON, 1); /* turn off the old */
goto env_common;
case TELOPT_OLD_ENVIRON: /* Old environment variable option */
if (my_state_is_will (TELOPT_NEW_ENVIRON))
break; /* Don't enable if new one is in use! */
env_common:
telopt_environ = option;
#endif
new_state_ok = 1;
break;
#if defined AUTHENTICATION
case TELOPT_AUTHENTICATION:
if (autologin)
new_state_ok = 1;
break;
#endif
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);
setconnmode (0); /* Set new tty mode */
}
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 (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;
#ifdef OLD_ENVIRON
case TELOPT_NEW_ENVIRON:
/*
* The new environ option wasn't recognized, try
* the old one.
*/
send_will (TELOPT_OLD_ENVIRON, 1);
telopt_environ = TELOPT_OLD_ENVIRON;
break;
#endif
}
/* 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);
}
int
is_unique (char *name, char **as, char **ae)
{
char **ap;
int n;
n = strlen (name) + 1;
for (ap = as; ap < ae; ap++)
if (strncasecmp (*ap, name, n) == 0)
return (0);
return (1);
}
/*
* Given a buffer returned by tgetent(), this routine will turn
* the pipe separated 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 *name_unknown = "UNKNOWN";
static char *unknown[] = { 0, 0 };
char **
mklist (char *buf, char *name)
{
int n;
char c, *cp, **argvp, *cp2, **argv, **avt;
if (name)
{
if ((int) strlen (name) > 40)
{
name = 0;
unknown[0] = name_unknown;
}
else
{
unknown[0] = name;
upcase (name);
}
}
else
unknown[0] = name_unknown;
/*
* An empty capability buffer finishes the analysis.
*/
if (!buf || !*buf)
return (unknown);
/*
* Count the number of alias names.
* Stop at the first field separator, a colon.
*/
for (n = 1, cp = buf; *cp && *cp != ':'; cp++)
{
if (*cp == '|')
n++;
}
/*
* Allocate an array to hold the name pointers.
*/
argv = (char **) malloc ((n + 3) * sizeof (char *));
if (argv == 0)
return (unknown);
/*
* Fill the array of pointers with the established aliases.
* Reserve the first slot for the preferred name.
*/
argvp = argv + 1;
*argv = *argvp = 0;
n = 0; /* Positive: name uses white space. */
for (cp = cp2 = buf; (c = *cp); cp++)
{
if (c == '|' || c == ':') /* Delimiters */
{
*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))
; /* Ignore the just scanned name. */
else if (name && (strncasecmp (name, cp2, cp - cp2) == 0))
*argv = cp2; /* Preferred name, exact match. */
else if (is_unique (cp2, argv + 1, argvp))
{
*argvp++ = cp2;
*argvp = 0; /* Prevent looking forward. */
}
/* Abort parsing at first field delimiter. */
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; /* Proceed to next alias name. */
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;
for (avt = &argv[1]; avt < argvp; avt++)
*avt = *(avt + 1);
*argvp++ = buf;
}
/*
* 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
{
--argvp;
for (avt = argv; avt < argvp; avt++)
*avt = *(avt + 1);
}
}
if (*argv)
return (argv);
else
return (unknown);
}
/* Claimed to be ignored by contemporary implementations,
* but still modified by FreeBSD and NetBSD.
* mklist will examine this buffer, so erase it
* to cover corner cases.
*/
char termbuf[2048] = { 0 };
static int
init_term (char *tname, int *errp)
{
int err = -1;
#ifdef HAVE_TGETENT
err = tgetent (termbuf, tname);
if (err == 1)
{
termbuf[sizeof (termbuf) - 1] = '\0';
if (errp)
*errp = 1;
return (0);
}
#endif /* HAVE_TGETENT */
if (errp)
*errp = 0;
return (-1);
}
int resettermname = 1;
char *
gettermname (void)
{
char *tname;
static char **tnamep = 0;
static char **next;
int err;
if (resettermname)
{
resettermname = 0;
if (tnamep && tnamep != unknown)
free (tnamep);
if ((tname = (char *) env_getvalue ("TERM")) &&
(init_term (tname, &err) == 0))
{
tnamep = mklist (termbuf, tname);
}
else
{
if (tname && ((int) strlen (tname) <= 40))
{
unknown[0] = tname;
upcase (tname);
}
else
unknown[0] = name_unknown;
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 (void)
{
unsigned char subchar;
printsub ('<', subbuffer, SB_LEN () + 2);
switch (subchar = SB_GET ())
{
case TELOPT_TTYPE:
if (my_want_state_is_wont (TELOPT_TTYPE))
return;
if (SB_EOF () || SB_GET () != TELQUAL_SEND)
{
return;
}
else
{
char *name;
unsigned 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 ()) && (len < (int) sizeof (temp)))
{
snprintf ((char *) temp, sizeof (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);
}
}
break;
case TELOPT_TSPEED:
if (my_want_state_is_wont (TELOPT_TSPEED))
return;
if (SB_EOF ())
return;
if (SB_GET () == TELQUAL_SEND)
{
long ospeed, ispeed;
unsigned char temp[50]; /* Two six-digit integers plus 7. */
int len;
TerminalSpeeds (&ispeed, &ospeed);
snprintf ((char *) temp, sizeof (temp), "%c%c%c%c%d,%d%c%c",
IAC, SB, TELOPT_TSPEED, TELQUAL_IS,
(int) ospeed, (int) ispeed, IAC, SE);
len = strlen ((char *) 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 (SB_EOF ())
return;
switch (SB_GET ())
{
case LFLOW_RESTART_ANY:
restartany = 1;
break;
case LFLOW_RESTART_XON:
restartany = 0;
break;
case LFLOW_ON:
localflow = 1;
break;
case LFLOW_OFF:
localflow = 0;
break;
default:
return;
}
setcommandmode ();
setconnmode (0);
break;
case TELOPT_LINEMODE:
if (my_want_state_is_wont (TELOPT_LINEMODE))
return;
if (SB_EOF ())
return;
switch (SB_GET ())
{
case WILL:
lm_will (subpointer, SB_LEN ());
break;
case WONT:
lm_wont (subpointer, SB_LEN ());
break;
case DO:
lm_do (subpointer, SB_LEN ());
break;
case DONT:
lm_dont (subpointer, SB_LEN ());
break;
case LM_SLC:
slc (subpointer, SB_LEN ());
break;
case LM_MODE:
lm_mode (subpointer, SB_LEN (), 0);
break;
default:
break;
}
break;
#ifdef OLD_ENVIRON
case TELOPT_OLD_ENVIRON:
#endif
case TELOPT_NEW_ENVIRON:
if (SB_EOF ())
return;
switch (SB_PEEK ())
{
case TELQUAL_IS:
case TELQUAL_INFO:
if (my_want_state_is_dont (subchar))
return;
break;
case TELQUAL_SEND:
if (my_want_state_is_wont (subchar))
{
return;
}
break;
default:
return;
}
env_opt (subpointer, SB_LEN ());
break;
case TELOPT_XDISPLOC:
if (my_want_state_is_wont (TELOPT_XDISPLOC))
return;
if (SB_EOF ())
return;
if (SB_GET () == TELQUAL_SEND)
{
unsigned 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;
}
/* Remote host, and display server must not be corrupted
* by truncation. In addition, every character of telnet
* protocol must remain unsevered. Check that DP fits in
* full within TEMP. Otherwise report buffer error and
* turn off the option.
*/
if (strlen ((char *) dp) >= sizeof (temp) - 4 - 2)
{
printf ("lm_will: not enough room in buffer for DISPLAY\n");
send_wont (TELOPT_XDISPLOC, 1);
break;
}
/* Go ahead safely. */
snprintf ((char *) temp, sizeof (temp), "%c%c%c%c%s%c%c",
IAC, SB, TELOPT_XDISPLOC, TELQUAL_IS, dp, IAC, SE);
len = strlen ((char *) 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;
#if defined AUTHENTICATION
case TELOPT_AUTHENTICATION:
{
if (!autologin)
break;
if (SB_EOF ())
return;
switch (SB_GET ())
{
case TELQUAL_IS:
if (my_want_state_is_dont (TELOPT_AUTHENTICATION))
return;
auth_is (subpointer, SB_LEN ());
break;
case TELQUAL_SEND:
if (my_want_state_is_wont (TELOPT_AUTHENTICATION))
return;
auth_send (subpointer, SB_LEN ());
break;
case TELQUAL_REPLY:
if (my_want_state_is_wont (TELOPT_AUTHENTICATION))
return;
auth_reply (subpointer, SB_LEN ());
break;
case TELQUAL_NAME:
if (my_want_state_is_dont (TELOPT_AUTHENTICATION))
return;
auth_name (subpointer, SB_LEN ());
break;
}
}
break;
#endif
#ifdef ENCRYPTION
case TELOPT_ENCRYPT:
if (SB_EOF ())
return;
switch (SB_GET ())
{
case ENCRYPT_START:
if (my_want_state_is_dont (TELOPT_ENCRYPT))
return;
encrypt_start (subpointer, SB_LEN ());
break;
case ENCRYPT_END:
if (my_want_state_is_dont (TELOPT_ENCRYPT))
return;
encrypt_end ();
break;
case ENCRYPT_SUPPORT:
if (my_want_state_is_wont (TELOPT_ENCRYPT))
return;
encrypt_support (subpointer, SB_LEN ());
break;
case ENCRYPT_REQSTART:
if (my_want_state_is_wont (TELOPT_ENCRYPT))
return;
encrypt_request_start (subpointer, SB_LEN ());
break;
case ENCRYPT_REQEND:
if (my_want_state_is_wont (TELOPT_ENCRYPT))
return;
/*
* We can always send an REQEND so that we cannot
* get stuck encrypting. We should only get this
* if we have been able to get in the correct mode
* anyhow.
*/
encrypt_request_end ();
break;
case ENCRYPT_IS:
if (my_want_state_is_dont (TELOPT_ENCRYPT))
return;
encrypt_is (subpointer, SB_LEN ());
break;
case ENCRYPT_REPLY:
if (my_want_state_is_wont (TELOPT_ENCRYPT))
return;
encrypt_reply (subpointer, SB_LEN ());
break;
case ENCRYPT_ENC_KEYID:
if (my_want_state_is_dont (TELOPT_ENCRYPT))
return;
encrypt_enc_keyid (subpointer, SB_LEN ());
break;
case ENCRYPT_DEC_KEYID:
if (my_want_state_is_wont (TELOPT_ENCRYPT))
return;
encrypt_dec_keyid (subpointer, SB_LEN ());
break;
default:
break;
}
break;
#endif /* ENCRYPTION */
default:
break;
}
}
static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE };
void
lm_will (unsigned char *cmd, int len)
{
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 () > (int) 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;
}
}
void
lm_wont (unsigned char *cmd, int len)
{
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;
}
}
void
lm_do (unsigned char *cmd, int len)
{
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 () > (int) 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;
}
}
void
lm_dont (unsigned char *cmd, int len)
{
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 unsigned char str_lm_mode[] = {
IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE
};
void
lm_mode (unsigned char *cmd, int len, int 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 () > (int) 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;
void
slc_init (void)
{
struct spc *spcp;
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);
}
void
slcstate (void)
{
printf ("Special characters are %s values\n",
slc_mode == SLC_IMPORT ? "remote default" :
slc_mode == SLC_EXPORT ? "local" : "remote");
}
void
slc_mode_export (int n)
{
slc_mode = SLC_EXPORT;
if (my_state_is_will (TELOPT_LINEMODE))
slc_export ();
}
void
slc_mode_import (int def)
{
slc_mode = def ? SLC_IMPORT : SLC_RVALUE;
if (my_state_is_will (TELOPT_LINEMODE))
slc_import (def);
}
unsigned char slc_import_val[] = {
IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE
};
unsigned char slc_import_def[] = {
IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE
};
void
slc_import (int def)
{
if (NETROOM () > (int) 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");
}
void
slc_export (void)
{
struct spc *spcp;
TerminalDefaultChars ();
slc_start_reply ();
for (spcp = &spc_data[1]; spcp < &spc_data[NSLC + 1]; spcp++)
{
if (spcp->mylevel != SLC_NOSUPPORT)
{
if (spcp->val == (cc_t) (_POSIX_VDISABLE))
spcp->flags = SLC_NOSUPPORT;
else
spcp->flags = spcp->mylevel;
if (spcp->valp)
spcp->val = *spcp->valp;
slc_add_reply (spcp - spc_data, spcp->flags, spcp->val);
}
}
slc_end_reply ();
slc_update ();
setconnmode (1); /* Make sure the character values are set */
}
void
slc (unsigned char *cp, int len)
{
struct spc *spcp;
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 */
}
void
slc_check (void)
{
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;
if (spcp->val == (cc_t) (_POSIX_VDISABLE))
spcp->flags = SLC_NOSUPPORT;
else
spcp->flags = spcp->mylevel;
slc_add_reply (spcp - spc_data, spcp->flags, spcp->val);
}
}
slc_end_reply ();
setconnmode (1);
}
unsigned char slc_reply[128];
unsigned char *slc_replyp;
void
slc_start_reply (void)
{
slc_replyp = slc_reply;
*slc_replyp++ = IAC;
*slc_replyp++ = SB;
*slc_replyp++ = TELOPT_LINEMODE;
*slc_replyp++ = LM_SLC;
}
void
slc_add_reply (unsigned int func, unsigned int 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;
}
void
slc_end_reply (void)
{
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");
}
int
slc_update (void)
{
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);
}
#ifdef OLD_ENVIRON
# ifdef ENV_HACK
/*
* Earlier version of telnet/telnetd from the BSD code had
* the definitions of VALUE and VAR reversed. To ensure
* maximum interoperability, we assume that the server is
* an older BSD server, until proven otherwise. The newer
* BSD servers should be able to handle either definition,
* so it is better to use the wrong values if we don't
* know what type of server it is.
*/
int env_auto = 1;
int old_env_var = OLD_ENV_VAR;
int old_env_value = OLD_ENV_VALUE;
# else
# define old_env_var OLD_ENV_VAR
# define old_env_value OLD_ENV_VALUE
# endif
#endif
void
env_opt (unsigned char *buf, int len)
{
unsigned char *ep = 0, *epc = 0;
int i;
switch (buf[0] & 0xff)
{
case TELQUAL_SEND:
env_opt_start ();
if (len == 1)
{
env_opt_add (NULL);
}
else
for (i = 1; i < len; i++)
{
switch (buf[i] & 0xff)
{
#ifdef OLD_ENVIRON
case OLD_ENV_VAR:
# ifdef ENV_HACK
if (telopt_environ == TELOPT_OLD_ENVIRON && env_auto)
{
/* Server has the same definitions */
old_env_var = OLD_ENV_VAR;
old_env_value = OLD_ENV_VALUE;
}
/* FALL THROUGH */
# endif
case OLD_ENV_VALUE:
/*
* Although OLD_ENV_VALUE is not legal, we will
* still recognize it, just in case it is an
* old server that has VAR & VALUE mixed up...
*/
/* FALL THROUGH */
#else
case NEW_ENV_VAR:
#endif
case ENV_USERVAR:
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 (2 * SUBBUFSIZE)
unsigned char *opt_reply = NULL;
unsigned char *opt_replyp;
unsigned char *opt_replyend;
void
env_opt_start (void)
{
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;
}
void
env_opt_start_info (void)
{
env_opt_start ();
if (opt_replyp)
opt_replyp[-1] = TELQUAL_INFO;
}
void
env_opt_add (unsigned char *ep)
{
unsigned char *vp, c;
if (opt_reply == NULL)
/*XXX*/ return;
/*XXX*/ if (ep == NULL || *ep == '\0')
{
/* Send user defined variables first. */
env_default (1, 0);
while ((ep = env_default (0, 0)))
env_opt_add (ep);
/* Now add the list of well know variables. */
env_default (1, 1);
while ((ep = env_default (0, 1)))
env_opt_add (ep);
return;
}
vp = env_getvalue ((char *) ep);
if (opt_replyp + (vp ? strlen ((char *) vp) : 0) +
strlen ((char *) ep) + 6 > opt_replyend)
{
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;
}
if (opt_welldefined ((char *) ep))
#ifdef OLD_ENVIRON
if (telopt_environ == TELOPT_OLD_ENVIRON)
*opt_replyp++ = old_env_var;
else
#endif
*opt_replyp++ = NEW_ENV_VAR;
else
*opt_replyp++ = ENV_USERVAR;
for (;;)
{
while ((c = *ep++))
{
if (opt_replyp + (2 + 2) > opt_replyend)
return;
switch (c & 0xff)
{
case IAC:
*opt_replyp++ = IAC;
break;
case NEW_ENV_VAR:
case NEW_ENV_VALUE:
case ENV_ESC:
case ENV_USERVAR:
*opt_replyp++ = ENV_ESC;
break;
}
*opt_replyp++ = c;
}
if ((ep = vp))
{
if (opt_replyp + (1 + 2 + 2) > opt_replyend)
return;
#ifdef OLD_ENVIRON
if (telopt_environ == TELOPT_OLD_ENVIRON)
*opt_replyp++ = old_env_value;
else
#endif
*opt_replyp++ = NEW_ENV_VALUE;
vp = NULL;
}
else
break;
}
}
int
opt_welldefined (char *ep)
{
if ((strcmp (ep, "USER") == 0) ||
(strcmp (ep, "DISPLAY") == 0) ||
(strcmp (ep, "PRINTER") == 0) ||
(strcmp (ep, "SYSTEMTYPE") == 0) ||
(strcmp (ep, "JOB") == 0) || (strcmp (ep, "ACCT") == 0))
return (1);
return (0);
}
void
env_opt_end (int emptyok)
{
int len;
if (opt_replyp + 2 > opt_replyend)
return;
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 (void)
{
int c;
int scc;
unsigned 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++;
#ifdef ENCRYPTION
if (decrypt_input)
c = (*decrypt_input) (c);
#endif /* ENCRYPTION */
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++;
# ifdef ENCRYPTION
if (decrypt_input)
c = (*decrypt_input) (c);
# endif/* ENCRYPTION */
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;
#ifdef ENCRYPTION
if (decrypt_input)
c = (*decrypt_input) (c);
#endif /* ENCRYPTION */
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
{
#ifdef ENCRYPTION
if (decrypt_input)
(*decrypt_input) (-1);
#endif /* ENCRYPTION */
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.
*/
printoption ("RCVD", IAC, DM);
SYNCHing = 1;
ttyflush (1);
SYNCHing = stilloob ();
settimer (gotDM);
break;
case SB:
SB_CLEAR ();
telrcv_state = TS_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;
}
}
printoption ("RCVD", IAC, EOR);
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 happened. 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 infinite loop here. So, instead,
* we terminate the suboption, and process the
* partial suboption if we can.
*/
SB_ACCUM (IAC);
SB_ACCUM (c);
subpointer -= 2;
SB_TERM ();
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_ACCUM (IAC);
SB_ACCUM (SE);
subpointer -= 2;
SB_TERM ();
suboption (); /* handle sub-option */
SetIn3270 ();
telrcv_state = TS_DATA;
}
}
}
if (count)
ring_consumed (&netiring, count);
return returnValue || count;
}
static int bol = 1, local = 0;
int
rlogin_susp (void)
{
if (local)
{
local = 0;
bol = 1;
command (0, "z\n", 2);
return (1);
}
return (0);
}
static int
telsnd (void)
{
int tcc;
int count;
int returnValue = 0;
unsigned char *tbp;
tcc = 0;
count = 0;
while (NETROOM () > 2)
{
int sc;
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 (rlogin != _POSIX_VDISABLE)
{
if (bol)
{
bol = 0;
if (sc == rlogin)
{
local = 1;
continue;
}
}
else if (local)
{
local = 0;
if (sc == '.' || c == termEofChar)
{
bol = 1;
command (0, "close\n", 6);
continue;
}
if (sc == termSuspChar)
{
bol = 1;
command (0, "z\n", 2);
continue;
}
if (sc == escape)
{
command (0, (char *) tbp, tcc);
bol = 1;
count += tcc;
tcc = 0;
flushline = 1;
break;
}
if (sc != rlogin)
{
++tcc;
--tbp;
--count;
c = sc = rlogin;
}
}
if ((sc == '\n') || (sc == '\r'))
bol = 1;
}
else if (escape != _POSIX_VDISABLE && sc == escape)
{
/*
* Double escape is a pass through of a single escape character.
*/
if (tcc && strip (*tbp) == escape)
{
tbp++;
tcc--;
count++;
bol = 0;
}
else
{
command (0, (char *) tbp, tcc);
bol = 1;
count += tcc;
tcc = 0;
flushline = 1;
break;
}
}
else
bol = 0;
#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)
{
bol = 1;
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');
bol = flushline = 1;
break;
case '\r':
if (!crlf)
{
NET2ADD ('\r', '\0');
}
else
{
NET2ADD ('\r', '\n');
}
bol = 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.
*
*/
/* block; should we block in the select ? */
int
Scheduler (int block)
{
/* 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 || defined __unix || defined __unix__)
if (HaveInput)
{
HaveInput = 0;
signal (SIGIO, inputAvailable);
}
#endif /* TN3270 && (unix || __unix || __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 (char *user)
{
sys_telnet_init ();
#if defined AUTHENTICATION || defined ENCRYPTION
{
static char *local_host = 0;
if (!local_host)
local_host = localhost ();
auth_encrypt_init (local_host, hostname, NULL, "TELNET", 0);
auth_encrypt_user (user);
}
#else /* !defined(AUTHENTICATION) && !defined(ENCRYPTION) */
(void) user;
#endif
#if !defined TN3270
if (telnetport)
{
# if defined AUTHENTICATION
if (autologin)
send_will (TELOPT_AUTHENTICATION, 1);
# endif
# ifdef ENCRYPTION
send_do (TELOPT_ENCRYPT, 1);
send_will (TELOPT_ENCRYPT, 1);
# endif/* ENCRYPTION */
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);
send_will (TELOPT_NEW_ENVIRON, 1);
send_do (TELOPT_STATUS, 1);
if (env_getvalue ("DISPLAY"))
send_will (TELOPT_XDISPLOC, 1);
if (eight)
tel_enter_binary (eight);
}
#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 (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 */
{
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 (void)
{
#if 0 /* XXX */
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;
memmove (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 (void)
{
NET2ADD (IAC, DO);
NETADD (TELOPT_TM);
flushline = 1;
flushout = 1;
ttyflush (1); /* Flush/drop output */
/* do printoption AFTER flush, otherwise the output gets tossed... */
printoption ("SENT", DO, TELOPT_TM);
}
void
xmitAO (void)
{
NET2ADD (IAC, AO);
printoption ("SENT", IAC, AO);
if (autoflush)
{
doflush ();
}
}
void
xmitEL (void)
{
NET2ADD (IAC, EL);
printoption ("SENT", IAC, EL);
}
void
xmitEC (void)
{
NET2ADD (IAC, EC);
printoption ("SENT", IAC, EC);
}
int
dosynch (const char *s)
{
netclear (); /* clear the path to the network */
NETADD (IAC);
setneturg ();
NETADD (DM);
printoption ("SENT", IAC, DM);
return 1;
}
int want_status_response = 0;
int
get_status (const char *s)
{
unsigned char tmp[16];
unsigned char *cp;
if (my_want_state_is_dont (TELOPT_STATUS))
{
printf ("Remote side does not support STATUS option\n");
return 0;
}
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);
}
++want_status_response;
return 1;
}
void
intp (void)
{
NET2ADD (IAC, IP);
printoption ("SENT", IAC, IP);
flushline = 1;
if (autoflush)
{
doflush ();
}
if (autosynch)
{
dosynch (NULL);
}
}
void
sendbrk (void)
{
NET2ADD (IAC, BREAK);
printoption ("SENT", IAC, BREAK);
flushline = 1;
if (autoflush)
{
doflush ();
}
if (autosynch)
{
dosynch (NULL);
}
}
void
sendabort (void)
{
NET2ADD (IAC, ABORT);
printoption ("SENT", IAC, ABORT);
flushline = 1;
if (autoflush)
{
doflush ();
}
if (autosynch)
{
dosynch (NULL);
}
}
void
sendsusp (void)
{
NET2ADD (IAC, SUSP);
printoption ("SENT", IAC, SUSP);
flushline = 1;
if (autoflush)
{
doflush ();
}
if (autosynch)
{
dosynch (NULL);
}
}
void
sendeof (void)
{
NET2ADD (IAC, xEOF);
printoption ("SENT", IAC, xEOF);
}
void
sendayt (void)
{
NET2ADD (IAC, AYT);
printoption ("SENT", IAC, AYT);
}
/*
* Send a window size update to the remote system.
*/
void
sendnaws (void)
{
long rows, cols;
unsigned char tmp[16];
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);
}
}
void
tel_enter_binary (int rw)
{
if (rw & 1)
send_do (TELOPT_BINARY, 1);
if (rw & 2)
send_will (TELOPT_BINARY, 1);
}
void
tel_leave_binary (int rw)
{
if (rw & 1)
send_dont (TELOPT_BINARY, 1);
if (rw & 2)
send_wont (TELOPT_BINARY, 1);
}
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