485 lines
12 KiB
C
485 lines
12 KiB
C
/*
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* Copyright (c) 1989, 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char sccsid[] = "@(#)slc.c 8.2 (Berkeley) 5/30/95";
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#endif
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#include "telnetd.h"
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#ifdef LINEMODE
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/*
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* local variables
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*/
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static unsigned char *def_slcbuf = (unsigned char *)0;
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static int def_slclen = 0;
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static int slcchange; /* change to slc is requested */
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static unsigned char *slcptr; /* pointer into slc buffer */
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static unsigned char slcbuf[NSLC*6]; /* buffer for slc negotiation */
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/*
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* send_slc
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*
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* Write out the current special characters to the client.
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*/
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void
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send_slc(void)
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{
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int i;
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/*
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* Send out list of triplets of special characters
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* to client. We only send info on the characters
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* that are currently supported.
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*/
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for (i = 1; i <= NSLC; i++) {
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if ((slctab[i].defset.flag & SLC_LEVELBITS) == SLC_NOSUPPORT)
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continue;
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add_slc((unsigned char)i, slctab[i].current.flag,
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slctab[i].current.val);
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}
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} /* end of send_slc */
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/*
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* default_slc
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*
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* Set pty special characters to all the defaults.
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*/
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static void
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default_slc(void)
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{
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int i;
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for (i = 1; i <= NSLC; i++) {
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slctab[i].current.val = slctab[i].defset.val;
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if (slctab[i].current.val == (cc_t)(_POSIX_VDISABLE))
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slctab[i].current.flag = SLC_NOSUPPORT;
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else
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slctab[i].current.flag = slctab[i].defset.flag;
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if (slctab[i].sptr) {
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*(slctab[i].sptr) = slctab[i].defset.val;
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}
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}
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slcchange = 1;
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} /* end of default_slc */
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#endif /* LINEMODE */
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/*
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* get_slc_defaults
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*
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* Initialize the slc mapping table.
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*/
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void
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get_slc_defaults(void)
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{
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int i;
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init_termbuf();
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for (i = 1; i <= NSLC; i++) {
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slctab[i].defset.flag =
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spcset(i, &slctab[i].defset.val, &slctab[i].sptr);
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slctab[i].current.flag = SLC_NOSUPPORT;
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slctab[i].current.val = 0;
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}
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} /* end of get_slc_defaults */
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#ifdef LINEMODE
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/*
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* add_slc
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*
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* Add an slc triplet to the slc buffer.
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*/
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void
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add_slc(char func, char flag, cc_t val)
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{
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if ((*slcptr++ = (unsigned char)func) == 0xff)
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*slcptr++ = 0xff;
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if ((*slcptr++ = (unsigned char)flag) == 0xff)
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*slcptr++ = 0xff;
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if ((*slcptr++ = (unsigned char)val) == 0xff)
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*slcptr++ = 0xff;
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} /* end of add_slc */
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/*
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* start_slc
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*
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* Get ready to process incoming slc's and respond to them.
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*
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* The parameter getit is non-zero if it is necessary to grab a copy
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* of the terminal control structures.
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*/
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void
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start_slc(int getit)
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{
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slcchange = 0;
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if (getit)
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init_termbuf();
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(void) sprintf((char *)slcbuf, "%c%c%c%c",
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IAC, SB, TELOPT_LINEMODE, LM_SLC);
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slcptr = slcbuf + 4;
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} /* end of start_slc */
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/*
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* end_slc
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*
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* Finish up the slc negotiation. If something to send, then send it.
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*/
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int
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end_slc(unsigned char **bufp)
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{
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int len;
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/*
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* If a change has occured, store the new terminal control
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* structures back to the terminal driver.
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*/
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if (slcchange) {
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set_termbuf();
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}
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/*
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* If the pty state has not yet been fully processed and there is a
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* deferred slc request from the client, then do not send any
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* sort of slc negotiation now. We will respond to the client's
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* request very soon.
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*/
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if (def_slcbuf && (terminit() == 0)) {
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return(0);
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}
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if (slcptr > (slcbuf + 4)) {
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if (bufp) {
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*bufp = &slcbuf[4];
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return(slcptr - slcbuf - 4);
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} else {
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(void) sprintf((char *)slcptr, "%c%c", IAC, SE);
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slcptr += 2;
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len = slcptr - slcbuf;
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output_datalen(slcbuf, len);
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netflush(); /* force it out immediately */
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DIAG(TD_OPTIONS, printsub('>', slcbuf+2, len-2););
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}
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}
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return (0);
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} /* end of end_slc */
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/*
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* process_slc
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*
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* Figure out what to do about the client's slc
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*/
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void
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process_slc(unsigned char func, unsigned char flag, cc_t val)
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{
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int hislevel, mylevel, ack;
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/*
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* Ensure that we know something about this function
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*/
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if (func > NSLC) {
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add_slc(func, SLC_NOSUPPORT, 0);
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return;
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}
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/*
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* Process the special case requests of 0 SLC_DEFAULT 0
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* and 0 SLC_VARIABLE 0. Be a little forgiving here, don't
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* worry about whether the value is actually 0 or not.
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*/
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if (func == 0) {
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if ((flag = flag & SLC_LEVELBITS) == SLC_DEFAULT) {
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default_slc();
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send_slc();
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} else if (flag == SLC_VARIABLE) {
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send_slc();
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}
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return;
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}
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/*
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* Appears to be a function that we know something about. So
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* get on with it and see what we know.
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*/
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hislevel = flag & SLC_LEVELBITS;
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mylevel = slctab[func].current.flag & SLC_LEVELBITS;
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ack = flag & SLC_ACK;
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/*
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* ignore the command if:
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* the function value and level are the same as what we already have;
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* or the level is the same and the ack bit is set
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*/
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if (hislevel == mylevel && (val == slctab[func].current.val || ack)) {
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return;
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} else if (ack) {
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/*
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* If we get here, we got an ack, but the levels don't match.
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* This shouldn't happen. If it does, it is probably because
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* we have sent two requests to set a variable without getting
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* a response between them, and this is the first response.
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* So, ignore it, and wait for the next response.
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*/
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return;
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} else {
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change_slc(func, flag, val);
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}
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} /* end of process_slc */
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/*
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* change_slc
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*
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* Process a request to change one of our special characters.
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* Compare client's request with what we are capable of supporting.
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*/
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void
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change_slc(char func, char flag, cc_t val)
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{
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int hislevel, mylevel;
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hislevel = flag & SLC_LEVELBITS;
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mylevel = slctab[(int)func].defset.flag & SLC_LEVELBITS;
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/*
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* If client is setting a function to NOSUPPORT
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* or DEFAULT, then we can easily and directly
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* accomodate the request.
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*/
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if (hislevel == SLC_NOSUPPORT) {
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slctab[(int)func].current.flag = flag;
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slctab[(int)func].current.val = (cc_t)_POSIX_VDISABLE;
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flag |= SLC_ACK;
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add_slc(func, flag, val);
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return;
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}
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if (hislevel == SLC_DEFAULT) {
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/*
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* Special case here. If client tells us to use
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* the default on a function we don't support, then
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* return NOSUPPORT instead of what we may have as a
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* default level of DEFAULT.
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*/
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if (mylevel == SLC_DEFAULT) {
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slctab[(int)func].current.flag = SLC_NOSUPPORT;
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} else {
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slctab[(int)func].current.flag = slctab[(int)func].defset.flag;
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}
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slctab[(int)func].current.val = slctab[(int)func].defset.val;
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add_slc(func, slctab[(int)func].current.flag,
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slctab[(int)func].current.val);
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return;
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}
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/*
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* Client wants us to change to a new value or he
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* is telling us that he can't change to our value.
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* Some of the slc's we support and can change,
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* some we do support but can't change,
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* and others we don't support at all.
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* If we can change it then we have a pointer to
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* the place to put the new value, so change it,
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* otherwise, continue the negotiation.
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*/
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if (slctab[(int)func].sptr) {
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/*
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* We can change this one.
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*/
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slctab[(int)func].current.val = val;
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*(slctab[(int)func].sptr) = val;
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slctab[(int)func].current.flag = flag;
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flag |= SLC_ACK;
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slcchange = 1;
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add_slc(func, flag, val);
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} else {
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/*
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* It is not possible for us to support this
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* request as he asks.
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*
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* If our level is DEFAULT, then just ack whatever was
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* sent.
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*
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* If he can't change and we can't change,
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* then degenerate to NOSUPPORT.
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*
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* Otherwise we send our level back to him, (CANTCHANGE
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* or NOSUPPORT) and if CANTCHANGE, send
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* our value as well.
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*/
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if (mylevel == SLC_DEFAULT) {
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slctab[(int)func].current.flag = flag;
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slctab[(int)func].current.val = val;
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flag |= SLC_ACK;
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} else if (hislevel == SLC_CANTCHANGE &&
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mylevel == SLC_CANTCHANGE) {
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flag &= ~SLC_LEVELBITS;
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flag |= SLC_NOSUPPORT;
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slctab[(int)func].current.flag = flag;
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} else {
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flag &= ~SLC_LEVELBITS;
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flag |= mylevel;
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slctab[(int)func].current.flag = flag;
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if (mylevel == SLC_CANTCHANGE) {
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slctab[(int)func].current.val =
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slctab[(int)func].defset.val;
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val = slctab[(int)func].current.val;
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}
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}
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add_slc(func, flag, val);
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}
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} /* end of change_slc */
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#if defined(USE_TERMIO) && (VEOF == VMIN)
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cc_t oldeofc = '\004';
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#endif
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/*
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* check_slc
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*
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* Check the special characters in use and notify the client if any have
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* changed. Only those characters that are capable of being changed are
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* likely to have changed. If a local change occurs, kick the support level
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* and flags up to the defaults.
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*/
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void
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check_slc(void)
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{
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int i;
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for (i = 1; i <= NSLC; i++) {
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#if defined(USE_TERMIO) && (VEOF == VMIN)
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/*
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* In a perfect world this would be a neat little
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* function. But in this world, we should not notify
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* client of changes to the VEOF char when
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* ICANON is off, because it is not representing
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* a special character.
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*/
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if (i == SLC_EOF) {
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if (!tty_isediting())
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continue;
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else if (slctab[i].sptr)
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oldeofc = *(slctab[i].sptr);
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}
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#endif /* defined(USE_TERMIO) && defined(SYSV_TERMIO) */
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if (slctab[i].sptr &&
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(*(slctab[i].sptr) != slctab[i].current.val)) {
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slctab[i].current.val = *(slctab[i].sptr);
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if (*(slctab[i].sptr) == (cc_t)_POSIX_VDISABLE)
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slctab[i].current.flag = SLC_NOSUPPORT;
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else
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slctab[i].current.flag = slctab[i].defset.flag;
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add_slc((unsigned char)i, slctab[i].current.flag,
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slctab[i].current.val);
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}
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}
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} /* check_slc */
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/*
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* do_opt_slc
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*
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* Process an slc option buffer. Defer processing of incoming slc's
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* until after the terminal state has been processed. Save the first slc
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* request that comes along, but discard all others.
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*
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* ptr points to the beginning of the buffer, len is the length.
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*/
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void
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do_opt_slc(unsigned char *ptr, int len)
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{
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unsigned char func, flag;
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cc_t val;
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unsigned char *end = ptr + len;
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if (terminit()) { /* go ahead */
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while (ptr < end) {
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func = *ptr++;
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if (ptr >= end) break;
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flag = *ptr++;
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if (ptr >= end) break;
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val = (cc_t)*ptr++;
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process_slc(func, flag, val);
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}
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} else {
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/*
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* save this slc buffer if it is the first, otherwise dump
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* it.
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*/
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if (def_slcbuf == (unsigned char *)0) {
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def_slclen = len;
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def_slcbuf = (unsigned char *)malloc((unsigned)len);
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if (def_slcbuf == (unsigned char *)0)
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return; /* too bad */
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memmove(def_slcbuf, ptr, len);
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}
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}
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} /* end of do_opt_slc */
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/*
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* deferslc
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*
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* Do slc stuff that was deferred.
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*/
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void
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deferslc(void)
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{
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if (def_slcbuf) {
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start_slc(1);
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do_opt_slc(def_slcbuf, def_slclen);
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(void) end_slc(0);
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free(def_slcbuf);
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def_slcbuf = (unsigned char *)0;
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def_slclen = 0;
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}
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} /* end of deferslc */
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#endif /* LINEMODE */
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