2216 lines
45 KiB
C
2216 lines
45 KiB
C
/*
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* Copyright (c) 1988, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#ifndef lint
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static const char sccsid[] = "@(#)telnet.c 8.4 (Berkeley) 5/30/95";
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#endif
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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/* By the way, we need to include curses.h before telnet.h since,
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* among other things, telnet.h #defines 'DO', which is a variable
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* declared in curses.h.
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*/
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#include <ctype.h>
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#include <curses.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <term.h>
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#include <unistd.h>
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#include <arpa/telnet.h>
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#include "ring.h"
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#include "defines.h"
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#include "externs.h"
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#include "types.h"
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#include "general.h"
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#include <libtelnet/misc.h>
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#define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x))
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static unsigned char subbuffer[SUBBUFSIZE],
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*subpointer, *subend; /* buffer for sub-options */
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#define SB_CLEAR() subpointer = subbuffer;
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#define SB_TERM() { subend = subpointer; SB_CLEAR(); }
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#define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
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*subpointer++ = (c); \
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}
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#define SB_GET() ((*subpointer++)&0xff)
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#define SB_PEEK() ((*subpointer)&0xff)
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#define SB_EOF() (subpointer >= subend)
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#define SB_LEN() (subend - subpointer)
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char options[256]; /* The combined options */
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char do_dont_resp[256];
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char will_wont_resp[256];
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int
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eight = 0,
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autologin = 0, /* Autologin anyone? */
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skiprc = 0,
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connected,
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showoptions,
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ISend, /* trying to send network data in */
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telnet_debug = 0,
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crmod,
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netdata, /* Print out network data flow */
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crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
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telnetport,
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SYNCHing, /* we are in TELNET SYNCH mode */
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flushout, /* flush output */
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autoflush = 0, /* flush output when interrupting? */
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autosynch, /* send interrupt characters with SYNCH? */
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localflow, /* we handle flow control locally */
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restartany, /* if flow control enabled, restart on any character */
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localchars, /* we recognize interrupt/quit */
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donelclchars, /* the user has set "localchars" */
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donebinarytoggle, /* the user has put us in binary */
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dontlecho, /* do we suppress local echoing right now? */
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globalmode,
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doaddrlookup = 1, /* do a reverse address lookup? */
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clienteof = 0;
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char *prompt = 0;
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cc_t escape;
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cc_t rlogin;
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#ifdef KLUDGELINEMODE
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cc_t echoc;
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#endif
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/*
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* Telnet receiver states for fsm
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*/
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#define TS_DATA 0
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#define TS_IAC 1
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#define TS_WILL 2
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#define TS_WONT 3
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#define TS_DO 4
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#define TS_DONT 5
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#define TS_CR 6
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#define TS_SB 7 /* sub-option collection */
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#define TS_SE 8 /* looking for sub-option end */
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static int telrcv_state;
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#ifdef OLD_ENVIRON
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unsigned char telopt_environ = TELOPT_NEW_ENVIRON;
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#else
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# define telopt_environ TELOPT_NEW_ENVIRON
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#endif
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jmp_buf toplevel;
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jmp_buf peerdied;
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int flushline;
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int linemode;
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#ifdef KLUDGELINEMODE
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int kludgelinemode = 1;
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#endif
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static int is_unique(char *, char **, char **);
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/*
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* The following are some clocks used to decide how to interpret
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* the relationship between various variables.
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*/
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Clocks clocks;
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/*
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* Initialize telnet environment.
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*/
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void
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init_telnet(void)
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{
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env_init();
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SB_CLEAR();
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ClearArray(options);
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connected = ISend = localflow = donebinarytoggle = 0;
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restartany = -1;
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SYNCHing = 0;
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/* Don't change NetTrace */
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escape = CONTROL(']');
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rlogin = _POSIX_VDISABLE;
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#ifdef KLUDGELINEMODE
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echoc = CONTROL('E');
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#endif
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flushline = 1;
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telrcv_state = TS_DATA;
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}
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/*
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* These routines are in charge of sending option negotiations
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* to the other side.
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*
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* The basic idea is that we send the negotiation if either side
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* is in disagreement as to what the current state should be.
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*/
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void
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send_do(int c, int init)
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{
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if (init) {
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if (((do_dont_resp[c] == 0) && my_state_is_do(c)) ||
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my_want_state_is_do(c))
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return;
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set_my_want_state_do(c);
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do_dont_resp[c]++;
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}
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NET2ADD(IAC, DO);
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NETADD(c);
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printoption("SENT", DO, c);
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}
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void
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send_dont(int c, int init)
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{
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if (init) {
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if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) ||
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my_want_state_is_dont(c))
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return;
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set_my_want_state_dont(c);
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do_dont_resp[c]++;
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}
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NET2ADD(IAC, DONT);
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NETADD(c);
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printoption("SENT", DONT, c);
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}
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void
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send_will(int c, int init)
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{
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if (init) {
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if (((will_wont_resp[c] == 0) && my_state_is_will(c)) ||
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my_want_state_is_will(c))
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return;
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set_my_want_state_will(c);
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will_wont_resp[c]++;
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}
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NET2ADD(IAC, WILL);
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NETADD(c);
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printoption("SENT", WILL, c);
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}
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void
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send_wont(int c, int init)
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{
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if (init) {
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if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) ||
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my_want_state_is_wont(c))
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return;
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set_my_want_state_wont(c);
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will_wont_resp[c]++;
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}
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NET2ADD(IAC, WONT);
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NETADD(c);
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printoption("SENT", WONT, c);
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}
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void
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willoption(int option)
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{
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int new_state_ok = 0;
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if (do_dont_resp[option]) {
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--do_dont_resp[option];
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if (do_dont_resp[option] && my_state_is_do(option))
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--do_dont_resp[option];
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}
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if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) {
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switch (option) {
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case TELOPT_ECHO:
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case TELOPT_BINARY:
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case TELOPT_SGA:
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settimer(modenegotiated);
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/* FALLTHROUGH */
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case TELOPT_STATUS:
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new_state_ok = 1;
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break;
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case TELOPT_TM:
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if (flushout)
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flushout = 0;
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/*
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* Special case for TM. If we get back a WILL,
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* pretend we got back a WONT.
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*/
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set_my_want_state_dont(option);
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set_my_state_dont(option);
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return; /* Never reply to TM will's/wont's */
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case TELOPT_LINEMODE:
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default:
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break;
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}
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if (new_state_ok) {
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set_my_want_state_do(option);
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send_do(option, 0);
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setconnmode(0); /* possibly set new tty mode */
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} else {
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do_dont_resp[option]++;
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send_dont(option, 0);
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}
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}
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set_my_state_do(option);
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}
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void
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wontoption(int option)
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{
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if (do_dont_resp[option]) {
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--do_dont_resp[option];
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if (do_dont_resp[option] && my_state_is_dont(option))
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--do_dont_resp[option];
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}
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if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) {
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switch (option) {
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#ifdef KLUDGELINEMODE
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case TELOPT_SGA:
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if (!kludgelinemode)
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break;
|
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/* FALLTHROUGH */
|
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#endif
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case TELOPT_ECHO:
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settimer(modenegotiated);
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break;
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case TELOPT_TM:
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if (flushout)
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flushout = 0;
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set_my_want_state_dont(option);
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set_my_state_dont(option);
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return; /* Never reply to TM will's/wont's */
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default:
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break;
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}
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set_my_want_state_dont(option);
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if (my_state_is_do(option))
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send_dont(option, 0);
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setconnmode(0); /* Set new tty mode */
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} else if (option == TELOPT_TM) {
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/*
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* Special case for TM.
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*/
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if (flushout)
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flushout = 0;
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set_my_want_state_dont(option);
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}
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set_my_state_dont(option);
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}
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static void
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dooption(int option)
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{
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int new_state_ok = 0;
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if (will_wont_resp[option]) {
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--will_wont_resp[option];
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if (will_wont_resp[option] && my_state_is_will(option))
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--will_wont_resp[option];
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}
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|
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if (will_wont_resp[option] == 0) {
|
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if (my_want_state_is_wont(option)) {
|
||
|
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switch (option) {
|
||
|
||
case TELOPT_TM:
|
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/*
|
||
* Special case for TM. We send a WILL, but pretend
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* we sent WONT.
|
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*/
|
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send_will(option, 0);
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set_my_want_state_wont(TELOPT_TM);
|
||
set_my_state_wont(TELOPT_TM);
|
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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 */
|
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case TELOPT_SGA: /* no big deal */
|
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new_state_ok = 1;
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break;
|
||
|
||
case TELOPT_NEW_ENVIRON: /* New environment variable option */
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||
#ifdef OLD_ENVIRON
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||
if (my_state_is_will(TELOPT_OLD_ENVIRON))
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send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */
|
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goto env_common;
|
||
case TELOPT_OLD_ENVIRON: /* Old environment variable option */
|
||
if (my_state_is_will(TELOPT_NEW_ENVIRON))
|
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break; /* Don't enable if new one is in use! */
|
||
env_common:
|
||
telopt_environ = option;
|
||
#endif
|
||
new_state_ok = 1;
|
||
break;
|
||
|
||
|
||
case TELOPT_XDISPLOC: /* X Display location */
|
||
if (env_getvalue("DISPLAY"))
|
||
new_state_ok = 1;
|
||
break;
|
||
|
||
case TELOPT_LINEMODE:
|
||
#ifdef KLUDGELINEMODE
|
||
kludgelinemode = 0;
|
||
send_do(TELOPT_SGA, 1);
|
||
#endif
|
||
set_my_want_state_will(TELOPT_LINEMODE);
|
||
send_will(option, 0);
|
||
set_my_state_will(TELOPT_LINEMODE);
|
||
slc_init();
|
||
return;
|
||
|
||
case TELOPT_ECHO: /* We're never going to echo... */
|
||
default:
|
||
break;
|
||
}
|
||
|
||
if (new_state_ok) {
|
||
set_my_want_state_will(option);
|
||
send_will(option, 0);
|
||
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;
|
||
|
||
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 *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)
|
||
{
|
||
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;
|
||
}
|
||
/* 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 256
|
||
unsigned char *opt_reply;
|
||
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 ? 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(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++)) {
|
||
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)) {
|
||
#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;
|
||
|
||
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++;
|
||
|
||
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) {
|
||
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();
|
||
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;
|
||
}
|
||
|
||
#define __unusedhere __unused
|
||
/*
|
||
* Select from tty and network...
|
||
*/
|
||
void
|
||
telnet(char *user __unusedhere)
|
||
{
|
||
sys_telnet_init();
|
||
|
||
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"))
|
||
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);
|
||
}
|