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telnetd/telnet/telnet.c

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/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#if 0
#ifndef lint
static const char sccsid[] = "@(#)telnet.c 8.4 (Berkeley) 5/30/95";
#endif
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.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.
*/
#include <ctype.h>
#include <curses.h>
#include <signal.h>
#include <stdlib.h>
#include <term.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <arpa/telnet.h>
#include "ring.h"
#include "defines.h"
#include "externs.h"
#include "types.h"
#include "general.h"
#ifdef AUTHENTICATION
#include <libtelnet/auth.h>
#endif
#ifdef ENCRYPTION
#include <libtelnet/encrypt.h>
#endif
#include <libtelnet/misc.h>
#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]; /* The combined options */
char do_dont_resp[256];
char will_wont_resp[256];
int
eight = 0,
autologin = 0, /* Autologin anyone? */
skiprc = 0,
connected,
showoptions,
ISend, /* trying to send network data in */
telnet_debug = 0,
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,
doaddrlookup = 1, /* do a reverse address lookup? */
clienteof = 0;
char *prompt = 0;
#ifdef ENCRYPTION
char *line; /* hack around breakage in sra.c :-( !! */
#endif
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;
int flushline;
int linemode;
#ifdef KLUDGELINEMODE
int kludgelinemode = 1;
#endif
static int is_unique(char *, char **, char **);
/*
* 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();
ClearArray(options);
connected = ISend = localflow = donebinarytoggle = 0;
#ifdef AUTHENTICATION
#ifdef ENCRYPTION
auth_encrypt_connect(connected);
#endif
#endif
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.
*/
unsigned char ComPortBaudRate[256];
void
DoBaudRate(char *arg)
{
char *temp, temp2[10];
int i;
uint32_t baudrate;
errno = 0;
baudrate = (uint32_t)strtol(arg, &temp, 10);
if (temp[0] != '\0' || (baudrate == 0 && errno != 0))
ExitString("Invalid baud rate provided.\n", 1);
for (i = 1; termspeeds[i].speed != -1; i++)
if (baudrate == termspeeds[i].speed)
break;
if (termspeeds[i].speed == -1)
ExitString("Invalid baud rate provided.\n", 1);
strlcpy(ComPortBaudRate, arg, sizeof(ComPortBaudRate));
if (NETROOM() < sizeof(temp2)) {
ExitString("No room in buffer for baud rate.\n", 1);
/* NOTREACHED */
}
snprintf(temp2, sizeof(temp2), "%c%c%c%c....%c%c", IAC, SB, TELOPT_COMPORT,
COMPORT_SET_BAUDRATE, IAC, SE);
baudrate = htonl(baudrate);
memcpy(&temp2[4], &baudrate, sizeof(baudrate));
ring_supply_data(&netoring, temp2, sizeof(temp2));
printsub('>', &temp[2], sizeof(temp2) - 2);
}
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]++;
}
if (telnetport < 0)
return;
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]++;
}
if (telnetport < 0)
return;
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]++;
}
if (telnetport < 0)
return;
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]++;
}
if (telnetport < 0)
return;
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:
case TELOPT_BINARY:
case TELOPT_SGA:
settimer(modenegotiated);
/* FALLTHROUGH */
case TELOPT_STATUS:
#ifdef 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;
/* FALLTHROUGH */
#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 */
#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;
#ifdef 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);
}
/*
* 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 const char *name_unknown = "UNKNOWN";
static const char *unknown[] = { NULL, NULL };
static const char **
mklist(char *buf, char *name)
{
int n;
char c, *cp, **argvp, *cp2, **argv, **avt;
if (name) {
if (strlen(name) > 40) {
name = 0;
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 != ':'; cp++) {
if (*cp == '|')
n++;
}
/*
* Allocate an array to put the name pointers into
*/
argv = (char **)malloc((n+3)*sizeof(char *));
if (argv == 0)
return(unknown);
/*
* Fill up the array of pointers to names.
*/
*argv = 0;
argvp = argv+1;
n = 0;
for (cp = cp2 = buf; (c = *cp); cp++) {
if (c == '|' || c == ':') {
*cp++ = '\0';
/*
* Skip entries that have spaces or are over 40
* characters long. If this is our environment
* name, then put it up front. Otherwise, as
* long as this is not a duplicate name (case
* insensitive) add it to the list.
*/
if (n || (cp - cp2 > 41))
;
else if (name && (strncasecmp(name, cp2, cp-cp2) == 0))
*argv = cp2;
else if (is_unique(cp2, argv+1, argvp))
*argvp++ = cp2;
if (c == ':')
break;
/*
* Skip multiple delimiters. Reset cp2 to
* the beginning of the next name. Reset n,
* the flag for names with spaces.
*/
while ((c = *cp) == '|')
cp++;
cp2 = cp;
n = 0;
}
/*
* Skip entries with spaces or non-ascii values.
* Convert lower case letters to upper case.
*/
if ((c == ' ') || !isascii(c))
n = 1;
else if (islower(c))
*cp = toupper(c);
}
/*
* Check for an old V6 2 character name. If the second
* name points to the beginning of the buffer, and is
* only 2 characters long, move it to the end of the array.
*/
if ((argv[1] == buf) && (strlen(argv[1]) == 2)) {
--argvp;
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((const char **)argv);
else
return(unknown);
}
static 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);
}
#ifdef TERMCAP
char termbuf[1024];
/*ARGSUSED*/
static int
setupterm(char *tname, int fd, int *errp)
{
if (tgetent(termbuf, tname) == 1) {
termbuf[1023] = '\0';
if (errp)
*errp = 1;
return(0);
}
if (errp)
*errp = 0;
return(-1);
}
#else
#define termbuf ttytype
extern char ttytype[];
#endif
int resettermname = 1;
static const char *
gettermname(void)
{
char *tname;
static const char **tnamep = 0;
static const char **next;
int err;
if (resettermname) {
resettermname = 0;
if (tnamep && tnamep != unknown)
free(tnamep);
if ((tname = env_getvalue("TERM")) &&
(setupterm(tname, 1, &err) == 0)) {
tnamep = mklist(termbuf, tname);
} else {
if (tname && (strlen(tname) <= 40)) {
unknown[0] = tname;
upcase(tname);
} 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 {
const char *name;
unsigned char temp[50];
int len;
name = gettermname();
len = strlen(name) + 4 + 2;
if (len < NETROOM()) {
sprintf(temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE,
TELQUAL_IS, name, IAC, SE);
ring_supply_data(&netoring, temp, len);
printsub('>', &temp[2], len-2);
} else {
ExitString("No room in buffer for terminal type.\n", 1);
/*NOTREACHED*/
}
}
break;
case TELOPT_TSPEED:
if (my_want_state_is_wont(TELOPT_TSPEED))
return;
if (SB_EOF())
return;
if (SB_GET() == TELQUAL_SEND) {
long ospeed, ispeed;
unsigned char temp[50];
int len;
TerminalSpeeds(&ispeed, &ospeed);
sprintf((char *)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;
#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 ||
strlen(dp) > sizeof(temp) - 7) {
/*
* Something happened, we no longer have a DISPLAY
* variable. Or it is too long. So, turn off the option.
*/
send_wont(TELOPT_XDISPLOC, 1);
break;
}
snprintf(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;
#ifdef 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(void)
{
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();
(void)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 const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)];
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 char func, unsigned char flags, cc_t value)
{
/* A sequence of up to 6 bytes my be written for this member of the SLC
* suboption list by this function. The end of negotiation command,
* which is written by slc_end_reply(), will require 2 additional
* bytes. Do not proceed unless there is sufficient space for these
* items.
*/
if (&slc_replyp[6+2] > slc_reply_eom)
return;
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;
/* The end of negotiation command requires 2 bytes. */
if (&slc_replyp[2] > slc_reply_eom)
return;
*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;
}
/* FALLTHROUGH */
# 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...
*/
/* FALLTHROUGH */
#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++;
/*FALLTHROUGH*/
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(ep);
if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) +
2 * 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(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(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;
if (opt_replyp + 2 > opt_replyend)
return;
len = opt_replyp + 2 - opt_reply;
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;
}
/* FALLTHROUGH */
case TS_DATA:
if (c == IAC && telnetport >= 0) {
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;
#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;
(void) ttyflush(1);
SYNCHing = stilloob();
settimer(gotDM);
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 happend. An IAC was not doubled, the
* IAC SE was left off, or another option got
* inserted into the suboption are all possibilities.
* If we assume that the IAC was not doubled,
* and really the IAC SE was left off, we could
* get into an infinate loop here. So, instead,
* we terminate the suboption, and process the
* partial suboption if we can.
*/
SB_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, 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.
*
*/
static 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
*/
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;
/* 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;
}
#ifdef AUTHENTICATION
#define __unusedhere
#else
#define __unusedhere __unused
#endif
/*
* Select from tty and network...
*/
void
telnet(char *user __unusedhere)
{
sys_telnet_init();
#ifdef AUTHENTICATION
#ifdef ENCRYPTION
{
static char local_host[256] = { 0 };
if (!local_host[0]) {
gethostname(local_host, sizeof(local_host));
local_host[sizeof(local_host)-1] = 0;
}
auth_encrypt_init(local_host, hostname, "TELNET", 0);
auth_encrypt_user(user);
}
#endif
#endif
if (telnetport > 0) {
#ifdef 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);
}
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)
{
/* Deleted */
}
/*
* 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(char *ch __unused)
{
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(char *ch __unused)
{
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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