File: [local] / src / usr.bin / telnet / telnet.c (download)
Revision 1.36, Thu Jul 11 03:54:27 2019 UTC (4 years, 10 months ago) by deraadt
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, OPENBSD_6_9_BASE, OPENBSD_6_9, OPENBSD_6_8_BASE, OPENBSD_6_8, OPENBSD_6_7_BASE, OPENBSD_6_7, OPENBSD_6_6_BASE, OPENBSD_6_6
Changes since 1.35: +3 -3 lines
on 12-Mar-98 when art replaced two sprintf calls with snprintf to avoid
an overflow, he left spaces at the end of the line. we have been incredibly
sloppy and not notice his oversight for 21 years.
bonus Y2K joke included.
|
/* $OpenBSD: telnet.c,v 1.36 2019/07/11 03:54:27 deraadt Exp $ */
/* $NetBSD: telnet.c,v 1.7 1996/02/28 21:04:15 thorpej Exp $ */
/*
* 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 "telnet_locl.h"
#include <arpa/telnet.h>
#include <ctype.h>
#include <curses.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <term.h>
#define strip(x) (eight ? (x) : ((x) & 0x7f))
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)
static void lm_will(unsigned char *, int);
static void lm_wont(unsigned char *, int);
static void lm_do(unsigned char *, int);
static void lm_dont(unsigned char *, int);
static void slc_init(void);
static void slc_import(int);
static void slc_export(void);
static void slc_start_reply(void);
static void slc_add_reply(unsigned char, unsigned char, cc_t);
static void slc_end_reply(void);
static void slc(unsigned char *, int);
static int slc_update(void);
static void env_opt(char *, int);
static void env_opt_start(void);
char options[256]; /* The combined options */
char do_dont_resp[256];
char will_wont_resp[256];
int
eight = 3,
binary = 0,
autologin = 0, /* Autologin anyone? */
skiprc = 0,
connections = 0,
connected,
showoptions,
ISend, /* trying to send network data in */
crmod,
netdata, /* Print out network data flow */
crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
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,
clienteof = 0;
char *prompt = NULL;
int scheduler_lockout_tty = 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;
# define telopt_environ TELOPT_NEW_ENVIRON
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;
/*
* Initialize telnet environment.
*/
void
init_telnet(void)
{
env_init();
SB_CLEAR();
memset(options, 0, sizeof options);
connected = ISend = localflow = donebinarytoggle = 0;
restartany = -1;
SYNCHing = 0;
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);
}
static 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:
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);
}
static 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;
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 */
new_state_ok = 1;
break;
case TELOPT_NEW_ENVIRON: /* New environment variable option */
new_state_ok = 1;
break;
case TELOPT_XDISPLOC: /* X Display location */
if (env_getvalue("DISPLAY", 0))
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;
}
/* 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);
}
/*
* This routine will turn a pipe separated list of names in the buffer
* into an array of pointers to NUL terminated names. We toss out any
* bad, duplicate, or verbose names (names with spaces).
*/
int is_unique(char *, char **, char **);
static char *name_unknown = "UNKNOWN";
static char *unknown[] = { NULL, NULL };
char **
mklist(char *buf, char *name)
{
int n;
char c, *cp, **argvp, *cp2, **argv, **avt;
if (name) {
if (strlen(name) > 40) {
name = NULL;
unknown[0] = name_unknown;
} else {
unknown[0] = name;
upcase(name);
}
} else
unknown[0] = name_unknown;
/*
* Count up the number of names.
*/
for (n = 1, cp = buf; *cp; cp++) {
if (*cp == '|')
n++;
}
/*
* Allocate an array to put the name pointers into
*/
argv = reallocarray(NULL, n+3, sizeof(char *));
if (argv == NULL)
return(unknown);
/*
* Fill up the array of pointers to names.
*/
*argv = NULL;
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.
*/
#define ISASCII(c) (!((c)&0x80))
if ((c == ' ') || !ISASCII(c))
n = 1;
else
*cp = toupper((unsigned char)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 = NULL;
if (*argv == NULL) {
if (name)
*argv = name;
else {
--argvp;
for (avt = argv; avt < argvp; avt++)
*avt = *(avt+1);
}
}
if (*argv)
return(argv);
else
return(unknown);
}
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);
}
int resettermname = 1;
char *
gettermname(void)
{
char *tname;
static char **tnamep = NULL;
static char **next;
int errret;
if (resettermname) {
resettermname = 0;
if (tnamep && tnamep != unknown)
free(tnamep);
if ((tname = env_getvalue("TERM", 0)) &&
(setupterm(tname, 1, &errret) == OK)) {
tnamep = mklist(ttytype, tname);
} else {
if (tname && (strlen(tname) <= 40)) {
unknown[0] = tname;
upcase(tname);
} else
unknown[0] = name_unknown;
tnamep = unknown;
}
next = tnamep;
}
if (*next == NULL)
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;
name = gettermname();
len = strlen(name) + 4 + 2;
if (len < NETROOM()) {
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];
int len;
TerminalSpeeds(&ispeed, &ospeed);
snprintf((char *)temp, sizeof(temp),
"%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED,
TELQUAL_IS, ospeed, 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;
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", 0)) == NULL) {
/*
* Something happened, we no longer have a DISPLAY
* variable. So, turn off the option.
*/
send_wont(TELOPT_XDISPLOC, 1);
break;
}
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;
default:
break;
}
}
static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE };
static 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() > 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;
}
}
static 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;
}
}
static 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() > 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;
}
}
static 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() > 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;
static void
slc_init(void)
{
struct spc *spcp;
localchars = 1;
for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) {
spcp->val = 0;
spcp->valp = NULL;
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);
initfunc(SLC_SUSP, SLC_FLUSHIN);
initfunc(SLC_EC, 0);
initfunc(SLC_EL, 0);
initfunc(SLC_EW, 0);
initfunc(SLC_RP, 0);
initfunc(SLC_LNEXT, 0);
initfunc(SLC_XON, 0);
initfunc(SLC_XOFF, 0);
initfunc(SLC_FORW1, 0);
initfunc(SLC_FORW2, 0);
/* No FORW2 */
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 unused)
{
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
};
static void
slc_import(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");
}
static 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();
(void)slc_update();
setconnmode(1); /* Make sure the character values are set */
}
static 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);
}
static unsigned char slc_reply[2 * SUBBUFSIZE];
static unsigned char *slc_replyp;
unsigned char
slc_add(unsigned char ch)
{
if (slc_replyp == slc_reply + sizeof(slc_reply))
return ch;
return *slc_replyp++ = ch;
}
static void
slc_start_reply(void)
{
slc_replyp = slc_reply;
slc_add(IAC);
slc_add(SB);
slc_add(TELOPT_LINEMODE);
slc_add(LM_SLC);
}
static void
slc_add_reply(unsigned char func, unsigned char flags, cc_t value)
{
if (slc_replyp + 6 >= slc_reply + sizeof(slc_reply)) {
printf("slc_add_reply: not enough room\n");
return;
}
if (slc_add(func) == IAC)
slc_add(IAC);
if (slc_add(flags) == IAC)
slc_add(IAC);
if (slc_add((unsigned char)value) == IAC)
slc_add(IAC);
}
static void
slc_end_reply(void)
{
int len;
if (slc_replyp + 2 >= slc_reply + sizeof(slc_reply)) {
printf("slc_end_reply: not enough room\n");
return;
}
slc_add(IAC);
slc_add(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");
}
static 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);
}
static void
env_opt(char *buf, int len)
{
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) {
case NEW_ENV_VAR:
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)
static unsigned char *opt_reply;
static unsigned char *opt_replyp;
static unsigned char *opt_replyend;
void
opt_add(unsigned char ch)
{
if (opt_replyp == opt_replyend)
return;
*opt_replyp++ = ch;
}
static void
env_opt_start(void)
{
unsigned char *p;
p = realloc(opt_reply, OPT_REPLY_SIZE);
if (p == NULL)
free(opt_reply);
opt_reply = p;
if (opt_reply == NULL) {
/*@*/ printf("env_opt_start: realloc() failed!!!\n");
opt_reply = opt_replyp = opt_replyend = NULL;
return;
}
opt_replyp = opt_reply;
opt_replyend = opt_reply + OPT_REPLY_SIZE;
opt_add(IAC);
opt_add(SB);
opt_add(telopt_environ);
opt_add(TELQUAL_IS);
}
void
env_opt_start_info(void)
{
env_opt_start();
if (opt_replyp)
opt_replyp[-1] = TELQUAL_INFO;
}
void
env_opt_add(char *ep)
{
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(ep, 1);
if (2 * (vp ? strlen(vp) : 0) + 2 * strlen(ep) + 6 >
opt_replyend - opt_replyp)
{
size_t len;
unsigned char *p;
len = opt_replyend - opt_reply;
len += OPT_REPLY_SIZE + 2 * strlen(ep);
if (vp)
len += 2 * strlen(vp);
p = realloc(opt_reply, len);
if (p == NULL) {
free(opt_reply);
/*@*/ printf("env_opt_add: realloc() failed!!!\n");
opt_reply = opt_replyp = opt_replyend = NULL;
return;
}
opt_replyp = p + (opt_replyp - opt_reply);
opt_replyend = p + len;
opt_reply = p;
}
if (opt_welldefined(ep))
opt_add(NEW_ENV_VAR);
else
opt_add(ENV_USERVAR);
for (;;) {
while ((c = *ep++)) {
switch(c&0xff) {
case IAC:
opt_add(IAC);
break;
case NEW_ENV_VAR:
case NEW_ENV_VALUE:
case ENV_ESC:
case ENV_USERVAR:
opt_add(ENV_ESC);
break;
}
opt_add(c);
}
if ((ep = vp)) {
opt_add(NEW_ENV_VALUE);
vp = NULL;
} else
break;
}
}
int
opt_welldefined(const 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;
len = opt_replyp - opt_reply + 2;
if (emptyok || len > 6) {
opt_add(IAC);
opt_add(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++;
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;
}
/*
* 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.
*/
printoption("RCVD", IAC, DM);
SYNCHing = 1;
(void) ttyflush(1);
SYNCHing = stilloob();
break;
case SB:
SB_CLEAR();
telrcv_state = TS_SB;
continue;
case IAC:
TTYADD(IAC);
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);
telrcv_state = TS_DATA;
continue;
case TS_WONT:
printoption("RCVD", WONT, c);
wontoption(c);
telrcv_state = TS_DATA;
continue;
case TS_DO:
printoption("RCVD", DO, c);
dooption(c);
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) */
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 */
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 */
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 (sc != _POSIX_VDISABLE && 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.
*
*/
int
Scheduler(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);
ttyin = ring_empty_count(&ttyiring) && (clienteof == 0);
netin = !ISend && ring_empty_count(&netiring);
netex = !SYNCHing;
/* If we have seen a signal recently, reset things */
if (scheduler_lockout_tty) {
ttyin = ttyout = 0;
}
/* 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)) {
returnValue |= telsnd();
}
if (ring_full_count(&netiring)) {
returnValue |= telrcv();
}
return returnValue;
}
/*
* Select from tty and network...
*/
void
telnet(char *user)
{
connections++;
sys_telnet_init();
if (pledge("stdio rpath tty", NULL) == -1) {
perror("pledge");
exit(1);
}
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);
send_will(TELOPT_NEW_ENVIRON, 1);
send_do(TELOPT_STATUS, 1);
if (env_getvalue("DISPLAY", 0))
send_will(TELOPT_XDISPLOC, 1);
if (binary)
tel_enter_binary(binary);
}
for (;;) {
int schedValue;
while ((schedValue = Scheduler(0)) != 0) {
if (schedValue == -1) {
setcommandmode();
return;
}
}
if (Scheduler(1) == -1) {
setcommandmode();
return;
}
}
}
#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;
(void) 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(void)
{
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(void)
{
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();
}
}
void
sendbrk(void)
{
NET2ADD(IAC, BREAK);
printoption("SENT", IAC, BREAK);
flushline = 1;
if (autoflush) {
doflush();
}
if (autosynch) {
dosynch();
}
}
void
sendabort(void)
{
NET2ADD(IAC, ABORT);
printoption("SENT", IAC, ABORT);
flushline = 1;
if (autoflush) {
doflush();
}
if (autosynch) {
dosynch();
}
}
void
sendsusp(void)
{
NET2ADD(IAC, SUSP);
printoption("SENT", IAC, SUSP);
flushline = 1;
if (autoflush) {
doflush();
}
if (autosynch) {
dosynch();
}
}
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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