2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 static const char sccsid[] = "@(#)state.c 8.5 (Berkeley) 5/30/95";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
45 #include <libtelnet/auth.h>
48 #include <libtelnet/encrypt.h>
51 unsigned char doopt[] = { IAC, DO, '%', 'c', 0 };
52 unsigned char dont[] = { IAC, DONT, '%', 'c', 0 };
53 unsigned char will[] = { IAC, WILL, '%', 'c', 0 };
54 unsigned char wont[] = { IAC, WONT, '%', 'c', 0 };
58 * Buffer for sub-options, and macros
59 * for suboptions buffer manipulations
61 unsigned char subbuffer[512], *subpointer= subbuffer, *subend= subbuffer;
63 #define SB_CLEAR() subpointer = subbuffer
64 #define SB_TERM() { subend = subpointer; SB_CLEAR(); }
65 #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
66 *subpointer++ = (c); \
68 #define SB_GET() ((*subpointer++)&0xff)
69 #define SB_EOF() (subpointer >= subend)
70 #define SB_LEN() (subend - subpointer)
73 unsigned char *subsave;
74 #define SB_SAVE() subsave = subpointer;
75 #define SB_RESTORE() subpointer = subsave;
82 #define TS_DATA 0 /* base state */
83 #define TS_IAC 1 /* look for double IAC's */
84 #define TS_CR 2 /* CR-LF ->'s CR */
85 #define TS_SB 3 /* throw away begin's... */
86 #define TS_SE 4 /* ...end's (suboption negotiation) */
87 #define TS_WILL 5 /* will option negotiation */
88 #define TS_WONT 6 /* wont " */
89 #define TS_DO 7 /* do " */
90 #define TS_DONT 8 /* dont " */
92 static void doclientstat(void);
98 static int state = TS_DATA;
101 if ((&ptyobuf[BUFSIZ] - pfrontp) < 2)
103 c = *netip++ & 0377, ncc--;
106 c = (*decrypt_input)(c);
107 #endif /* ENCRYPTION */
112 /* Strip off \n or \0 after a \r */
113 if ((c == 0) || (c == '\n')) {
124 * We now map \r\n ==> \r for pragmatic reasons.
125 * Many client implementations send \r\n when
126 * the user hits the CarriageReturn key.
128 * We USED to map \r\n ==> \n, since \r\n says
129 * that we want to be in column 1 of the next
130 * printable line, and \n is the standard
131 * unix way of saying that (\r is only good
132 * if CRMOD is set, which it normally is).
134 if ((c == '\r') && his_state_is_wont(TELOPT_BINARY)) {
138 nc = (*decrypt_input)(nc & 0xff);
139 #endif /* ENCRYPTION */
142 * If we are operating in linemode,
143 * convert to local end-of-line.
145 if (linemode && (ncc > 0) && (('\n' == nc) ||
146 ((0 == nc) && tty_iscrnl())) ) {
154 (void)(*decrypt_input)(-1);
155 #endif /* ENCRYPTION */
166 * Send the process on the pty side an
167 * interrupt. Do this with a NULL or
168 * interrupt char; depending on the tty mode.
172 printoption("td: recv IAC", c));
178 printoption("td: recv IAC", c));
187 printoption("td: recv IAC", c));
197 printoption("td: recv IAC", c));
198 ptyflush(); /* half-hearted */
201 if (slctab[SLC_AO].sptr &&
202 *slctab[SLC_AO].sptr != (cc_t)(_POSIX_VDISABLE)) {
204 (unsigned char)*slctab[SLC_AO].sptr;
207 netclear(); /* clear buffer back */
208 output_data("%c%c", IAC, DM);
209 neturg = nfrontp-1; /* off by one XXX */
211 printoption("td: send IAC", DM));
216 * Erase Character and
225 printoption("td: recv IAC", c));
226 ptyflush(); /* half-hearted */
229 ch = *slctab[SLC_EC].sptr;
231 ch = *slctab[SLC_EL].sptr;
232 if (ch != (cc_t)(_POSIX_VDISABLE))
233 *pfrontp++ = (unsigned char)ch;
238 * Check for urgent data...
242 printoption("td: recv IAC", c));
243 SYNCHing = stilloob(net);
249 * Begin option subnegotiation...
272 if (his_state_is_will(TELOPT_EOR))
277 * Handle RFC 10xx Telnet linemode option additions
278 * to command stream (EOF, SUSP, ABORT).
311 * bad form of suboption negotiation.
312 * handle it in such a way as to avoid
313 * damage to local state. Parse
314 * suboption buffer found so far,
315 * then treat remaining stream as
316 * another command sequence.
319 /* for DIAGNOSTICS */
332 /* for DIAGNOSTICS */
338 suboption(); /* handle sub-option */
364 syslog(LOG_ERR, "panic state=%d", state);
365 printf("telnetd: panic state=%d\n", state);
369 } /* end of telrcv */
372 * The will/wont/do/dont state machines are based on Dave Borman's
373 * Telnet option processing state machine.
375 * These correspond to the following states:
376 * my_state = the last negotiated state
377 * want_state = what I want the state to go to
378 * want_resp = how many requests I have sent
379 * All state defaults are negative, and resp defaults to 0.
381 * When initiating a request to change state to new_state:
383 * if ((want_resp == 0 && new_state == my_state) || want_state == new_state) {
386 * want_state = new_state;
391 * When receiving new_state:
395 * if (want_resp && (new_state == my_state))
398 * if ((want_resp == 0) && (new_state != want_state)) {
399 * if (ok_to_switch_to new_state)
400 * want_state = new_state;
405 * my_state = new_state;
407 * Note that new_state is implied in these functions by the function itself.
408 * will and do imply positive new_state, wont and dont imply negative.
410 * Finally, there is one catch. If we send a negative response to a
411 * positive request, my_state will be the positive while want_state will
412 * remain negative. my_state will revert to negative when the negative
413 * acknowlegment arrives from the peer. Thus, my_state generally tells
414 * us not only the last negotiated state, but also tells us what the peer
415 * wants to be doing as well. It is important to understand this difference
416 * as we may wish to be processing data streams based on our desired state
417 * (want_state) or based on what the peer thinks the state is (my_state).
419 * This all works fine because if the peer sends a positive request, the data
420 * that we receive prior to negative acknowlegment will probably be affected
421 * by the positive state, and we can process it as such (if we can; if we
422 * can't then it really doesn't matter). If it is that important, then the
423 * peer probably should be buffering until this option state negotiation
428 send_do(int option, int init)
431 if ((do_dont_resp[option] == 0 && his_state_is_will(option)) ||
432 his_want_state_is_will(option))
435 * Special case for TELOPT_TM: We send a DO, but pretend
436 * that we sent a DONT, so that we can send more DOs if
439 if (option == TELOPT_TM)
440 set_his_want_state_wont(option);
442 set_his_want_state_will(option);
443 do_dont_resp[option]++;
445 output_data((const char *)doopt, option);
447 DIAG(TD_OPTIONS, printoption("td: send do", option));
451 willoption(int option)
454 void (*func)(void) = 0;
457 * process input from peer.
460 DIAG(TD_OPTIONS, printoption("td: recv will", option));
462 if (do_dont_resp[option]) {
463 do_dont_resp[option]--;
464 if (do_dont_resp[option] && his_state_is_will(option))
465 do_dont_resp[option]--;
467 if (do_dont_resp[option] == 0) {
468 if (his_want_state_is_wont(option)) {
480 * See comments below for more info.
482 not42 = 0; /* looks like a 4.2 system */
486 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
488 * This telnetd implementation does not really
489 * support timing marks, it just uses them to
490 * support the kludge linemode stuff. If we
491 * receive a will or wont TM in response to our
492 * do TM request that may have been sent to
493 * determine kludge linemode support, process
494 * it, otherwise TM should get a negative
498 * Handle the linemode kludge stuff.
499 * If we are not currently supporting any
500 * linemode at all, then we assume that this
501 * is the client telling us to use kludge
502 * linemode in response to our query. Set the
503 * linemode type that is to be supported, note
504 * that the client wishes to use linemode, and
505 * eat the will TM as though it never arrived.
507 if (lmodetype < KLUDGE_LINEMODE) {
508 lmodetype = KLUDGE_LINEMODE;
509 clientstat(TELOPT_LINEMODE, WILL, 0);
510 send_wont(TELOPT_SGA, 1);
511 } else if (lmodetype == NO_AUTOKLUDGE) {
512 lmodetype = KLUDGE_OK;
514 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
516 * We never respond to a WILL TM, and
517 * we leave the state WONT.
523 * If we are going to support flow control
524 * option, then don't worry peer that we can't
525 * change the flow control characters.
527 slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS;
528 slctab[SLC_XON].defset.flag |= SLC_DEFAULT;
529 slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS;
530 slctab[SLC_XOFF].defset.flag |= SLC_DEFAULT;
535 case TELOPT_XDISPLOC:
536 case TELOPT_NEW_ENVIRON:
537 case TELOPT_OLD_ENVIRON:
542 case TELOPT_LINEMODE:
543 # ifdef KLUDGELINEMODE
545 * Note client's desire to use linemode.
547 lmodetype = REAL_LINEMODE;
548 # endif /* KLUDGELINEMODE */
552 #endif /* LINEMODE */
554 #ifdef AUTHENTICATION
555 case TELOPT_AUTHENTICATION:
556 if (auth_level >= 0) {
565 func = encrypt_send_support;
568 #endif /* ENCRYPTION */
574 set_his_want_state_will(option);
577 do_dont_resp[option]++;
578 send_dont(option, 0);
582 * Option processing that should happen when
583 * we receive conformation of a change in
584 * state that we had requested.
588 not42 = 0; /* looks like a 4.2 system */
590 * Egads, he responded "WILL ECHO". Turn
593 send_dont(option, 1);
595 * "WILL ECHO". Kludge upon kludge!
596 * A 4.2 client is now echoing user input at
597 * the tty. This is probably undesireable and
598 * it should be stopped. The client will
599 * respond WONT TM to the DO TM that we send to
600 * check for kludge linemode. When the WONT TM
601 * arrives, linemode will be turned off and a
602 * change propogated to the pty. This change
603 * will cause us to process the new pty state
604 * in localstat(), which will notice that
605 * linemode is off and send a WILL ECHO
606 * so that we are properly in character mode and
611 case TELOPT_LINEMODE:
612 # ifdef KLUDGELINEMODE
614 * Note client's desire to use linemode.
616 lmodetype = REAL_LINEMODE;
617 # endif /* KLUDGELINEMODE */
620 #endif /* LINEMODE */
622 #ifdef AUTHENTICATION
623 case TELOPT_AUTHENTICATION:
630 func = encrypt_send_support;
632 #endif /* ENCRYPTION */
639 set_his_state_will(option);
642 } /* end of willoption */
645 send_dont(int option, int init)
648 if ((do_dont_resp[option] == 0 && his_state_is_wont(option)) ||
649 his_want_state_is_wont(option))
651 set_his_want_state_wont(option);
652 do_dont_resp[option]++;
654 output_data((const char *)dont, option);
656 DIAG(TD_OPTIONS, printoption("td: send dont", option));
660 wontoption(int option)
663 * Process client input.
666 DIAG(TD_OPTIONS, printoption("td: recv wont", option));
668 if (do_dont_resp[option]) {
669 do_dont_resp[option]--;
670 if (do_dont_resp[option] && his_state_is_wont(option))
671 do_dont_resp[option]--;
673 if (do_dont_resp[option] == 0) {
674 if (his_want_state_is_will(option)) {
675 /* it is always ok to change to negative state */
678 not42 = 1; /* doesn't seem to be a 4.2 system */
688 case TELOPT_LINEMODE:
689 # ifdef KLUDGELINEMODE
691 * If real linemode is supported, then client is
692 * asking to turn linemode off.
694 if (lmodetype != REAL_LINEMODE)
696 lmodetype = KLUDGE_LINEMODE;
697 # endif /* KLUDGELINEMODE */
698 clientstat(TELOPT_LINEMODE, WONT, 0);
700 #endif /* LINEMODE */
704 * If we get a WONT TM, and had sent a DO TM,
705 * don't respond with a DONT TM, just leave it
706 * as is. Short circut the state machine to
709 set_his_want_state_wont(TELOPT_TM);
714 * If we are not going to support flow control
715 * option, then let peer know that we can't
716 * change the flow control characters.
718 slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS;
719 slctab[SLC_XON].defset.flag |= SLC_CANTCHANGE;
720 slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS;
721 slctab[SLC_XOFF].defset.flag |= SLC_CANTCHANGE;
724 #ifdef AUTHENTICATION
725 case TELOPT_AUTHENTICATION:
726 auth_finished(0, AUTH_REJECT);
731 * For options that we might spin waiting for
732 * sub-negotiation, if the client turns off the
733 * option rather than responding to the request,
734 * we have to treat it here as if we got a response
735 * to the sub-negotiation, (by updating the timers)
736 * so that we'll break out of the loop.
739 settimer(ttypesubopt);
743 settimer(tspeedsubopt);
746 case TELOPT_XDISPLOC:
747 settimer(xdisplocsubopt);
750 case TELOPT_OLD_ENVIRON:
751 settimer(oenvironsubopt);
754 case TELOPT_NEW_ENVIRON:
755 settimer(environsubopt);
761 set_his_want_state_wont(option);
762 if (his_state_is_will(option))
763 send_dont(option, 0);
767 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
768 if (lmodetype < NO_AUTOKLUDGE) {
769 lmodetype = NO_LINEMODE;
770 clientstat(TELOPT_LINEMODE, WONT, 0);
771 send_will(TELOPT_SGA, 1);
772 send_will(TELOPT_ECHO, 1);
774 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
777 #ifdef AUTHENTICATION
778 case TELOPT_AUTHENTICATION:
779 auth_finished(0, AUTH_REJECT);
787 set_his_state_wont(option);
789 } /* end of wontoption */
792 send_will(int option, int init)
795 if ((will_wont_resp[option] == 0 && my_state_is_will(option))||
796 my_want_state_is_will(option))
798 set_my_want_state_will(option);
799 will_wont_resp[option]++;
801 output_data((const char *)will, option);
803 DIAG(TD_OPTIONS, printoption("td: send will", option));
806 #if !defined(LINEMODE) || !defined(KLUDGELINEMODE)
808 * When we get a DONT SGA, we will try once to turn it
809 * back on. If the other side responds DONT SGA, we
810 * leave it at that. This is so that when we talk to
811 * clients that understand KLUDGELINEMODE but not LINEMODE,
812 * we'll keep them in char-at-a-time mode.
823 * Process client input.
826 DIAG(TD_OPTIONS, printoption("td: recv do", option));
828 if (will_wont_resp[option]) {
829 will_wont_resp[option]--;
830 if (will_wont_resp[option] && my_state_is_will(option))
831 will_wont_resp[option]--;
833 if ((will_wont_resp[option] == 0) && (my_want_state_is_wont(option))) {
837 # ifdef KLUDGELINEMODE
838 if (lmodetype == NO_LINEMODE)
840 if (his_state_is_wont(TELOPT_LINEMODE))
859 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
861 * If kludge linemode is in use, then we must
862 * process an incoming do SGA for linemode
865 if (lmodetype == KLUDGE_LINEMODE) {
867 * Receipt of "do SGA" in kludge
868 * linemode is the peer asking us to
869 * turn off linemode. Make note of
872 clientstat(TELOPT_LINEMODE, WONT, 0);
874 * If linemode did not get turned off
875 * then don't tell peer that we did.
876 * Breaking here forces a wont SGA to
884 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
894 * Special case for TM. We send a WILL, but
895 * pretend we sent a WONT.
897 send_will(option, 0);
898 set_my_want_state_wont(option);
899 set_my_state_wont(option);
904 * When we get a LOGOUT option, respond
905 * with a WILL LOGOUT, make sure that
906 * it gets written out to the network,
907 * and then just go away...
909 set_my_want_state_will(TELOPT_LOGOUT);
910 send_will(TELOPT_LOGOUT, 0);
911 set_my_state_will(TELOPT_LOGOUT);
921 #endif /* ENCRYPTION */
922 case TELOPT_LINEMODE:
927 case TELOPT_XDISPLOC:
928 #ifdef TELOPT_ENVIRON
929 case TELOPT_NEW_ENVIRON:
931 case TELOPT_OLD_ENVIRON:
936 set_my_want_state_will(option);
937 send_will(option, 0);
939 will_wont_resp[option]++;
940 send_wont(option, 0);
943 set_my_state_will(option);
945 } /* end of dooption */
948 send_wont(int option, int init)
951 if ((will_wont_resp[option] == 0 && my_state_is_wont(option)) ||
952 my_want_state_is_wont(option))
954 set_my_want_state_wont(option);
955 will_wont_resp[option]++;
957 output_data((const char *)wont, option);
959 DIAG(TD_OPTIONS, printoption("td: send wont", option));
963 dontoption(int option)
966 * Process client input.
970 DIAG(TD_OPTIONS, printoption("td: recv dont", option));
972 if (will_wont_resp[option]) {
973 will_wont_resp[option]--;
974 if (will_wont_resp[option] && my_state_is_wont(option))
975 will_wont_resp[option]--;
977 if ((will_wont_resp[option] == 0) && (my_want_state_is_will(option))) {
985 case TELOPT_ECHO: /* we should stop echoing */
987 # ifdef KLUDGELINEMODE
988 if ((lmodetype != REAL_LINEMODE) &&
989 (lmodetype != KLUDGE_LINEMODE))
991 if (his_state_is_wont(TELOPT_LINEMODE))
1002 #if defined(LINEMODE) && defined(KLUDGELINEMODE)
1004 * If kludge linemode is in use, then we
1005 * must process an incoming do SGA for
1006 * linemode purposes.
1008 if ((lmodetype == KLUDGE_LINEMODE) ||
1009 (lmodetype == KLUDGE_OK)) {
1011 * The client is asking us to turn
1014 lmodetype = KLUDGE_LINEMODE;
1015 clientstat(TELOPT_LINEMODE, WILL, 0);
1017 * If we did not turn line mode on,
1018 * then what do we say? Will SGA?
1019 * This violates design of telnet.
1020 * Gross. Very Gross.
1025 set_my_want_state_wont(option);
1026 if (my_state_is_will(option))
1027 send_wont(option, 0);
1028 set_my_state_wont(option);
1029 if (turn_on_sga ^= 1)
1030 send_will(option, 1);
1032 #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
1038 set_my_want_state_wont(option);
1039 if (my_state_is_will(option))
1040 send_wont(option, 0);
1042 set_my_state_wont(option);
1044 } /* end of dontoption */
1048 int env_ovalue = -1;
1049 #else /* ENV_HACK */
1050 # define env_ovar OLD_ENV_VAR
1051 # define env_ovalue OLD_ENV_VALUE
1052 #endif /* ENV_HACK */
1057 * Look at the sub-option buffer, and try to be helpful to the other
1060 * Currently we recognize:
1072 DIAG(TD_OPTIONS, {netflush(); printsub('<', subpointer, SB_LEN()+2);});
1076 case TELOPT_TSPEED: {
1079 if (his_state_is_wont(TELOPT_TSPEED)) /* Ignore if option disabled */
1082 settimer(tspeedsubopt);
1084 if (SB_EOF() || SB_GET() != TELQUAL_IS)
1087 xspeed = atoi((char *)subpointer);
1089 while (SB_GET() != ',' && !SB_EOF());
1093 rspeed = atoi((char *)subpointer);
1094 clientstat(TELOPT_TSPEED, xspeed, rspeed);
1098 } /* end of case TELOPT_TSPEED */
1100 case TELOPT_TTYPE: { /* Yaaaay! */
1101 static char terminalname[41];
1103 if (his_state_is_wont(TELOPT_TTYPE)) /* Ignore if option disabled */
1105 settimer(ttypesubopt);
1107 if (SB_EOF() || SB_GET() != TELQUAL_IS) {
1108 return; /* ??? XXX but, this is the most robust */
1111 terminaltype = terminalname;
1113 while ((terminaltype < (terminalname + sizeof terminalname-1)) &&
1121 *terminaltype++ = c; /* accumulate name */
1124 terminaltype = terminalname;
1126 } /* end of case TELOPT_TTYPE */
1129 int xwinsize, ywinsize;
1131 if (his_state_is_wont(TELOPT_NAWS)) /* Ignore if option disabled */
1136 xwinsize = SB_GET() << 8;
1139 xwinsize |= SB_GET();
1142 ywinsize = SB_GET() << 8;
1145 ywinsize |= SB_GET();
1146 clientstat(TELOPT_NAWS, xwinsize, ywinsize);
1150 } /* end of case TELOPT_NAWS */
1153 case TELOPT_LINEMODE: {
1156 if (his_state_is_wont(TELOPT_LINEMODE)) /* Ignore if option disabled */
1159 * Process linemode suboptions.
1162 break; /* garbage was sent */
1163 request = SB_GET(); /* get will/wont */
1166 break; /* another garbage check */
1168 if (request == LM_SLC) { /* SLC is not preceeded by WILL or WONT */
1170 * Process suboption buffer of slc's
1173 do_opt_slc(subpointer, subend - subpointer);
1176 } else if (request == LM_MODE) {
1179 useeditmode = SB_GET(); /* get mode flag */
1180 clientstat(LM_MODE, 0, 0);
1186 switch (SB_GET()) { /* what suboption? */
1187 case LM_FORWARDMASK:
1189 * According to spec, only server can send request for
1190 * forwardmask, and client can only return a positive response.
1191 * So don't worry about it.
1198 } /* end of case TELOPT_LINEMODE */
1200 case TELOPT_STATUS: {
1208 if (my_state_is_will(TELOPT_STATUS))
1219 } /* end of case TELOPT_STATUS */
1221 case TELOPT_XDISPLOC: {
1222 if (SB_EOF() || SB_GET() != TELQUAL_IS)
1224 settimer(xdisplocsubopt);
1225 subpointer[SB_LEN()] = '\0';
1226 (void)setenv("DISPLAY", (char *)subpointer, 1);
1228 } /* end of case TELOPT_XDISPLOC */
1230 #ifdef TELOPT_NEW_ENVIRON
1231 case TELOPT_NEW_ENVIRON:
1233 case TELOPT_OLD_ENVIRON: {
1235 char *cp, *varp, *valp;
1240 if (c == TELQUAL_IS) {
1241 if (subchar == TELOPT_OLD_ENVIRON)
1242 settimer(oenvironsubopt);
1244 settimer(environsubopt);
1245 } else if (c != TELQUAL_INFO) {
1249 #ifdef TELOPT_NEW_ENVIRON
1250 if (subchar == TELOPT_NEW_ENVIRON) {
1253 if ((c == NEW_ENV_VAR) || (c == ENV_USERVAR))
1261 * We only want to do this if we haven't already decided
1262 * whether or not the other side has its VALUE and VAR
1266 int last = -1; /* invalid value */
1268 int got_var = 0, got_value = 0, got_uservar = 0;
1271 * The other side might have its VALUE and VAR values
1272 * reversed. To be interoperable, we need to determine
1273 * which way it is. If the first recognized character
1274 * is a VAR or VALUE, then that will tell us what
1275 * type of client it is. If the fist recognized
1276 * character is a USERVAR, then we continue scanning
1277 * the suboption looking for two consecutive
1278 * VAR or VALUE fields. We should not get two
1279 * consecutive VALUE fields, so finding two
1280 * consecutive VALUE or VAR fields will tell us
1281 * what the client is.
1288 if (last < 0 || last == OLD_ENV_VAR
1289 || (empty && (last == OLD_ENV_VALUE)))
1295 if (last < 0 || last == OLD_ENV_VALUE
1296 || (empty && (last == OLD_ENV_VAR)))
1297 goto env_ovar_wrong;
1299 last = OLD_ENV_VALUE;
1302 /* count strings of USERVAR as one */
1303 if (last != ENV_USERVAR)
1306 if (last == OLD_ENV_VALUE)
1308 if (last == OLD_ENV_VAR)
1309 goto env_ovar_wrong;
1324 if (last == OLD_ENV_VALUE)
1326 if (last == OLD_ENV_VAR)
1327 goto env_ovar_wrong;
1330 * Ok, the first thing was a USERVAR, and there
1331 * are not two consecutive VAR or VALUE commands,
1332 * and none of the VAR or VALUE commands are empty.
1333 * If the client has sent us a well-formed option,
1334 * then the number of VALUEs received should always
1335 * be less than or equal to the number of VARs and
1336 * USERVARs received.
1338 * If we got exactly as many VALUEs as VARs and
1339 * USERVARs, the client has the same definitions.
1341 * If we got exactly as many VARs as VALUEs and
1342 * USERVARS, the client has reversed definitions.
1344 if (got_uservar + got_var == got_value) {
1346 env_ovar = OLD_ENV_VAR;
1347 env_ovalue = OLD_ENV_VALUE;
1348 } else if (got_uservar + got_value == got_var) {
1350 env_ovar = OLD_ENV_VALUE;
1351 env_ovalue = OLD_ENV_VAR;
1353 output_data("ENVIRON VALUE and VAR are reversed!\r\n"));
1362 if ((c == env_ovar) || (c == ENV_USERVAR))
1370 cp = varp = (char *)subpointer;
1375 if (subchar == TELOPT_OLD_ENVIRON) {
1378 else if (c == env_ovalue)
1385 cp = valp = (char *)subpointer;
1392 (void)setenv(varp, valp, 1);
1395 cp = varp = (char *)subpointer;
1411 (void)setenv(varp, valp, 1);
1415 } /* end of case TELOPT_NEW_ENVIRON */
1416 #ifdef AUTHENTICATION
1417 case TELOPT_AUTHENTICATION:
1424 * These are sent by us and cannot be sent by
1429 auth_is(subpointer, SB_LEN());
1432 auth_name(subpointer, SB_LEN());
1438 case TELOPT_ENCRYPT:
1442 case ENCRYPT_SUPPORT:
1443 encrypt_support(subpointer, SB_LEN());
1446 encrypt_is(subpointer, SB_LEN());
1449 encrypt_reply(subpointer, SB_LEN());
1452 encrypt_start(subpointer, SB_LEN());
1457 case ENCRYPT_REQSTART:
1458 encrypt_request_start(subpointer, SB_LEN());
1460 case ENCRYPT_REQEND:
1462 * We can always send an REQEND so that we cannot
1463 * get stuck encrypting. We should only get this
1464 * if we have been able to get in the correct mode
1467 encrypt_request_end();
1469 case ENCRYPT_ENC_KEYID:
1470 encrypt_enc_keyid(subpointer, SB_LEN());
1472 case ENCRYPT_DEC_KEYID:
1473 encrypt_dec_keyid(subpointer, SB_LEN());
1479 #endif /* ENCRYPTION */
1483 } /* end of switch */
1485 } /* end of suboption */
1490 clientstat(TELOPT_LINEMODE, WILL, 0);
1493 #define ADD(c) *ncp++ = c
1494 #define ADD_DATA(c) { *ncp++ = c; if (c == SE || c == IAC) *ncp++ = c; }
1498 unsigned char statusbuf[256];
1504 netflush(); /* get rid of anything waiting to go out */
1512 * We check the want_state rather than the current state,
1513 * because if we received a DO/WILL for an option that we
1514 * don't support, and the other side didn't send a DONT/WONT
1515 * in response to our WONT/DONT, then the "state" will be
1516 * WILL/DO, and the "want_state" will be WONT/DONT. We
1517 * need to go by the latter.
1519 for (i = 0; i < (unsigned char)NTELOPTS; i++) {
1520 if (my_want_state_is_will(i)) {
1526 if (his_want_state_is_will(i)) {
1534 if (his_want_state_is_will(TELOPT_LFLOW)) {
1544 if (restartany >= 0) {
1548 ADD(LFLOW_RESTART_ANY);
1550 ADD(LFLOW_RESTART_XON);
1557 if (his_want_state_is_will(TELOPT_LINEMODE)) {
1558 unsigned char *cp, *cpe;
1562 ADD(TELOPT_LINEMODE);
1568 ADD(TELOPT_LINEMODE);
1573 for (cpe = cp + len; cp < cpe; cp++)
1577 #endif /* LINEMODE */
1582 output_datalen(statusbuf, ncp - statusbuf);
1583 netflush(); /* Send it on its way */
1586 {printsub('>', statusbuf, ncp - statusbuf); netflush();});
1590 * This function appends data to nfrontp and advances nfrontp.
1591 * Returns the number of characters written altogether (the
1592 * buffer may have been flushed in the process).
1596 output_data(const char *format, ...)
1602 va_start(args, format);
1603 if ((len = vasprintf(&buf, format, args)) == -1)
1605 output_datalen(buf, len);
1612 output_datalen(const char *buf, int len)
1614 int remaining, copied;
1616 remaining = BUFSIZ - (nfrontp - netobuf);
1618 /* Free up enough space if the room is too low*/
1619 if ((len > BUFSIZ ? BUFSIZ : len) > remaining) {
1621 remaining = BUFSIZ - (nfrontp - netobuf);
1624 /* Copy out as much as will fit */
1625 copied = remaining > len ? len : remaining;
1626 memmove(nfrontp, buf, copied);
1629 remaining -= copied;