diff options
Diffstat (limited to 'crypto/kerberosIV/appl/telnet/telnetd/state.c')
| -rw-r--r-- | crypto/kerberosIV/appl/telnet/telnetd/state.c | 1356 |
1 files changed, 0 insertions, 1356 deletions
diff --git a/crypto/kerberosIV/appl/telnet/telnetd/state.c b/crypto/kerberosIV/appl/telnet/telnetd/state.c deleted file mode 100644 index 80b90ea..0000000 --- a/crypto/kerberosIV/appl/telnet/telnetd/state.c +++ /dev/null @@ -1,1356 +0,0 @@ -/* - * Copyright (c) 1989, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#include "telnetd.h" - -RCSID("$Id: state.c,v 1.13 1999/05/13 23:12:50 assar Exp $"); - -unsigned char doopt[] = { IAC, DO, '%', 'c', 0 }; -unsigned char dont[] = { IAC, DONT, '%', 'c', 0 }; -unsigned char will[] = { IAC, WILL, '%', 'c', 0 }; -unsigned char wont[] = { IAC, WONT, '%', 'c', 0 }; -int not42 = 1; - -/* - * Buffer for sub-options, and macros - * for suboptions buffer manipulations - */ -unsigned char subbuffer[2048], *subpointer= subbuffer, *subend= subbuffer; - -#define SB_CLEAR() subpointer = subbuffer -#define SB_TERM() { subend = subpointer; SB_CLEAR(); } -#define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ - *subpointer++ = (c); \ - } -#define SB_GET() ((*subpointer++)&0xff) -#define SB_EOF() (subpointer >= subend) -#define SB_LEN() (subend - subpointer) - -#ifdef ENV_HACK -unsigned char *subsave; -#define SB_SAVE() subsave = subpointer; -#define SB_RESTORE() subpointer = subsave; -#endif - - -/* - * State for recv fsm - */ -#define TS_DATA 0 /* base state */ -#define TS_IAC 1 /* look for double IAC's */ -#define TS_CR 2 /* CR-LF ->'s CR */ -#define TS_SB 3 /* throw away begin's... */ -#define TS_SE 4 /* ...end's (suboption negotiation) */ -#define TS_WILL 5 /* will option negotiation */ -#define TS_WONT 6 /* wont -''- */ -#define TS_DO 7 /* do -''- */ -#define TS_DONT 8 /* dont -''- */ - -void -telrcv(void) -{ - int c; - static int state = TS_DATA; - - while (ncc > 0) { - if ((&ptyobuf[BUFSIZ] - pfrontp) < 2) - break; - c = *netip++ & 0377, ncc--; -#ifdef ENCRYPTION - if (decrypt_input) - c = (*decrypt_input)(c); -#endif - switch (state) { - - case TS_CR: - state = TS_DATA; - /* Strip off \n or \0 after a \r */ - if ((c == 0) || (c == '\n')) { - break; - } - /* FALL THROUGH */ - - case TS_DATA: - if (c == IAC) { - state = TS_IAC; - break; - } - /* - * We now map \r\n ==> \r for pragmatic reasons. - * Many client implementations send \r\n when - * the user hits the CarriageReturn key. - * - * We USED to map \r\n ==> \n, since \r\n says - * that we want to be in column 1 of the next - * printable line, and \n is the standard - * unix way of saying that (\r is only good - * if CRMOD is set, which it normally is). - */ - if ((c == '\r') && his_state_is_wont(TELOPT_BINARY)) { - int nc = *netip; -#ifdef ENCRYPTION - if (decrypt_input) - nc = (*decrypt_input)(nc & 0xff); -#endif - { -#ifdef ENCRYPTION - if (decrypt_input) - (void)(*decrypt_input)(-1); -#endif - state = TS_CR; - } - } - *pfrontp++ = c; - break; - - case TS_IAC: - gotiac: switch (c) { - - /* - * Send the process on the pty side an - * interrupt. Do this with a NULL or - * interrupt char; depending on the tty mode. - */ - case IP: - DIAG(TD_OPTIONS, - printoption("td: recv IAC", c)); - interrupt(); - break; - - case BREAK: - DIAG(TD_OPTIONS, - printoption("td: recv IAC", c)); - sendbrk(); - break; - - /* - * Are You There? - */ - case AYT: - DIAG(TD_OPTIONS, - printoption("td: recv IAC", c)); - recv_ayt(); - break; - - /* - * Abort Output - */ - case AO: - { - DIAG(TD_OPTIONS, - printoption("td: recv IAC", c)); - ptyflush(); /* half-hearted */ - init_termbuf(); - - if (slctab[SLC_AO].sptr && - *slctab[SLC_AO].sptr != (cc_t)(_POSIX_VDISABLE)) { - *pfrontp++ = - (unsigned char)*slctab[SLC_AO].sptr; - } - - netclear(); /* clear buffer back */ - output_data ("%c%c", IAC, DM); - neturg = nfrontp-1; /* off by one XXX */ - DIAG(TD_OPTIONS, - printoption("td: send IAC", DM)); - break; - } - - /* - * Erase Character and - * Erase Line - */ - case EC: - case EL: - { - cc_t ch; - - DIAG(TD_OPTIONS, - printoption("td: recv IAC", c)); - ptyflush(); /* half-hearted */ - init_termbuf(); - if (c == EC) - ch = *slctab[SLC_EC].sptr; - else - ch = *slctab[SLC_EL].sptr; - if (ch != (cc_t)(_POSIX_VDISABLE)) - *pfrontp++ = (unsigned char)ch; - break; - } - - /* - * Check for urgent data... - */ - case DM: - DIAG(TD_OPTIONS, - printoption("td: recv IAC", c)); - SYNCHing = stilloob(net); - settimer(gotDM); - break; - - - /* - * Begin option subnegotiation... - */ - case SB: - state = TS_SB; - SB_CLEAR(); - continue; - - case WILL: - state = TS_WILL; - continue; - - case WONT: - state = TS_WONT; - continue; - - case DO: - state = TS_DO; - continue; - - case DONT: - state = TS_DONT; - continue; - case EOR: - if (his_state_is_will(TELOPT_EOR)) - doeof(); - break; - - /* - * Handle RFC 10xx Telnet linemode option additions - * to command stream (EOF, SUSP, ABORT). - */ - case xEOF: - doeof(); - break; - - case SUSP: - sendsusp(); - break; - - case ABORT: - sendbrk(); - break; - - case IAC: - *pfrontp++ = c; - break; - } - state = TS_DATA; - break; - - case TS_SB: - if (c == IAC) { - state = TS_SE; - } else { - SB_ACCUM(c); - } - break; - - case TS_SE: - if (c != SE) { - if (c != IAC) { - /* - * bad form of suboption negotiation. - * handle it in such a way as to avoid - * damage to local state. Parse - * suboption buffer found so far, - * then treat remaining stream as - * another command sequence. - */ - - /* for DIAGNOSTICS */ - SB_ACCUM(IAC); - SB_ACCUM(c); - subpointer -= 2; - - SB_TERM(); - suboption(); - state = TS_IAC; - goto gotiac; - } - SB_ACCUM(c); - state = TS_SB; - } else { - /* for DIAGNOSTICS */ - SB_ACCUM(IAC); - SB_ACCUM(SE); - subpointer -= 2; - - SB_TERM(); - suboption(); /* handle sub-option */ - state = TS_DATA; - } - break; - - case TS_WILL: - willoption(c); - state = TS_DATA; - continue; - - case TS_WONT: - wontoption(c); - if (c==TELOPT_ENCRYPT && his_do_dont_is_changing(TELOPT_ENCRYPT) ) - dontoption(c); - state = TS_DATA; - continue; - - case TS_DO: - dooption(c); - state = TS_DATA; - continue; - - case TS_DONT: - dontoption(c); - state = TS_DATA; - continue; - - default: - syslog(LOG_ERR, "telnetd: panic state=%d\n", state); - printf("telnetd: panic state=%d\n", state); - exit(1); - } - } -} /* end of telrcv */ - -/* - * The will/wont/do/dont state machines are based on Dave Borman's - * Telnet option processing state machine. - * - * These correspond to the following states: - * my_state = the last negotiated state - * want_state = what I want the state to go to - * want_resp = how many requests I have sent - * All state defaults are negative, and resp defaults to 0. - * - * When initiating a request to change state to new_state: - * - * if ((want_resp == 0 && new_state == my_state) || want_state == new_state) { - * do nothing; - * } else { - * want_state = new_state; - * send new_state; - * want_resp++; - * } - * - * When receiving new_state: - * - * if (want_resp) { - * want_resp--; - * if (want_resp && (new_state == my_state)) - * want_resp--; - * } - * if ((want_resp == 0) && (new_state != want_state)) { - * if (ok_to_switch_to new_state) - * want_state = new_state; - * else - * want_resp++; - * send want_state; - * } - * my_state = new_state; - * - * Note that new_state is implied in these functions by the function itself. - * will and do imply positive new_state, wont and dont imply negative. - * - * Finally, there is one catch. If we send a negative response to a - * positive request, my_state will be the positive while want_state will - * remain negative. my_state will revert to negative when the negative - * acknowlegment arrives from the peer. Thus, my_state generally tells - * us not only the last negotiated state, but also tells us what the peer - * wants to be doing as well. It is important to understand this difference - * as we may wish to be processing data streams based on our desired state - * (want_state) or based on what the peer thinks the state is (my_state). - * - * This all works fine because if the peer sends a positive request, the data - * that we receive prior to negative acknowlegment will probably be affected - * by the positive state, and we can process it as such (if we can; if we - * can't then it really doesn't matter). If it is that important, then the - * peer probably should be buffering until this option state negotiation - * is complete. - * - */ -void -send_do(int option, int init) -{ - if (init) { - if ((do_dont_resp[option] == 0 && his_state_is_will(option)) || - his_want_state_is_will(option)) - return; - /* - * Special case for TELOPT_TM: We send a DO, but pretend - * that we sent a DONT, so that we can send more DOs if - * we want to. - */ - if (option == TELOPT_TM) - set_his_want_state_wont(option); - else - set_his_want_state_will(option); - do_dont_resp[option]++; - } - output_data((const char *)doopt, option); - - DIAG(TD_OPTIONS, printoption("td: send do", option)); -} - -#ifdef AUTHENTICATION -extern void auth_request(void); -#endif -#ifdef ENCRYPTION -extern void encrypt_send_support(); -#endif - -void -willoption(int option) -{ - int changeok = 0; - void (*func)() = 0; - - /* - * process input from peer. - */ - - DIAG(TD_OPTIONS, printoption("td: recv will", option)); - - if (do_dont_resp[option]) { - do_dont_resp[option]--; - if (do_dont_resp[option] && his_state_is_will(option)) - do_dont_resp[option]--; - } - if (do_dont_resp[option] == 0) { - if (his_want_state_is_wont(option)) { - switch (option) { - - case TELOPT_BINARY: - init_termbuf(); - tty_binaryin(1); - set_termbuf(); - changeok++; - break; - - case TELOPT_ECHO: - /* - * See comments below for more info. - */ - not42 = 0; /* looks like a 4.2 system */ - break; - - case TELOPT_TM: - /* - * We never respond to a WILL TM, and - * we leave the state WONT. - */ - return; - - case TELOPT_LFLOW: - /* - * If we are going to support flow control - * option, then don't worry peer that we can't - * change the flow control characters. - */ - slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS; - slctab[SLC_XON].defset.flag |= SLC_DEFAULT; - slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS; - slctab[SLC_XOFF].defset.flag |= SLC_DEFAULT; - case TELOPT_TTYPE: - case TELOPT_SGA: - case TELOPT_NAWS: - case TELOPT_TSPEED: - case TELOPT_XDISPLOC: - case TELOPT_NEW_ENVIRON: - case TELOPT_OLD_ENVIRON: - changeok++; - break; - - -#ifdef AUTHENTICATION - case TELOPT_AUTHENTICATION: - func = auth_request; - changeok++; - break; -#endif - -#ifdef ENCRYPTION - case TELOPT_ENCRYPT: - func = encrypt_send_support; - changeok++; - break; -#endif - - default: - break; - } - if (changeok) { - set_his_want_state_will(option); - send_do(option, 0); - } else { - do_dont_resp[option]++; - send_dont(option, 0); - } - } else { - /* - * Option processing that should happen when - * we receive conformation of a change in - * state that we had requested. - */ - switch (option) { - case TELOPT_ECHO: - not42 = 0; /* looks like a 4.2 system */ - /* - * Egads, he responded "WILL ECHO". Turn - * it off right now! - */ - send_dont(option, 1); - /* - * "WILL ECHO". Kludge upon kludge! - * A 4.2 client is now echoing user input at - * the tty. This is probably undesireable and - * it should be stopped. The client will - * respond WONT TM to the DO TM that we send to - * check for kludge linemode. When the WONT TM - * arrives, linemode will be turned off and a - * change propogated to the pty. This change - * will cause us to process the new pty state - * in localstat(), which will notice that - * linemode is off and send a WILL ECHO - * so that we are properly in character mode and - * all is well. - */ - break; - -#ifdef AUTHENTICATION - case TELOPT_AUTHENTICATION: - func = auth_request; - break; -#endif - -#ifdef ENCRYPTION - case TELOPT_ENCRYPT: - func = encrypt_send_support; - break; -#endif - - case TELOPT_LFLOW: - func = flowstat; - break; - } - } - } - set_his_state_will(option); - if (func) - (*func)(); -} /* end of willoption */ - -void -send_dont(int option, int init) -{ - if (init) { - if ((do_dont_resp[option] == 0 && his_state_is_wont(option)) || - his_want_state_is_wont(option)) - return; - set_his_want_state_wont(option); - do_dont_resp[option]++; - } - output_data((const char *)dont, option); - - DIAG(TD_OPTIONS, printoption("td: send dont", option)); -} - -void -wontoption(int option) -{ - /* - * Process client input. - */ - - DIAG(TD_OPTIONS, printoption("td: recv wont", option)); - - if (do_dont_resp[option]) { - do_dont_resp[option]--; - if (do_dont_resp[option] && his_state_is_wont(option)) - do_dont_resp[option]--; - } - if (do_dont_resp[option] == 0) { - if (his_want_state_is_will(option)) { - /* it is always ok to change to negative state */ - switch (option) { - case TELOPT_ECHO: - not42 = 1; /* doesn't seem to be a 4.2 system */ - break; - - case TELOPT_BINARY: - init_termbuf(); - tty_binaryin(0); - set_termbuf(); - break; - - case TELOPT_TM: - /* - * If we get a WONT TM, and had sent a DO TM, - * don't respond with a DONT TM, just leave it - * as is. Short circut the state machine to - * achive this. - */ - set_his_want_state_wont(TELOPT_TM); - return; - - case TELOPT_LFLOW: - /* - * If we are not going to support flow control - * option, then let peer know that we can't - * change the flow control characters. - */ - slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS; - slctab[SLC_XON].defset.flag |= SLC_CANTCHANGE; - slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS; - slctab[SLC_XOFF].defset.flag |= SLC_CANTCHANGE; - break; - -#ifdef AUTHENTICATION - case TELOPT_AUTHENTICATION: - auth_finished(0, AUTH_REJECT); - break; -#endif - - /* - * For options that we might spin waiting for - * sub-negotiation, if the client turns off the - * option rather than responding to the request, - * we have to treat it here as if we got a response - * to the sub-negotiation, (by updating the timers) - * so that we'll break out of the loop. - */ - case TELOPT_TTYPE: - settimer(ttypesubopt); - break; - - case TELOPT_TSPEED: - settimer(tspeedsubopt); - break; - - case TELOPT_XDISPLOC: - settimer(xdisplocsubopt); - break; - - case TELOPT_OLD_ENVIRON: - settimer(oenvironsubopt); - break; - - case TELOPT_NEW_ENVIRON: - settimer(environsubopt); - break; - - default: - break; - } - set_his_want_state_wont(option); - if (his_state_is_will(option)) - send_dont(option, 0); - } else { - switch (option) { - case TELOPT_TM: - break; - -#ifdef AUTHENTICATION - case TELOPT_AUTHENTICATION: - auth_finished(0, AUTH_REJECT); - break; -#endif - default: - break; - } - } - } - set_his_state_wont(option); - -} /* end of wontoption */ - -void -send_will(int option, int init) -{ - if (init) { - if ((will_wont_resp[option] == 0 && my_state_is_will(option))|| - my_want_state_is_will(option)) - return; - set_my_want_state_will(option); - will_wont_resp[option]++; - } - output_data ((const char *)will, option); - - DIAG(TD_OPTIONS, printoption("td: send will", option)); -} - -/* - * When we get a DONT SGA, we will try once to turn it - * back on. If the other side responds DONT SGA, we - * leave it at that. This is so that when we talk to - * clients that understand KLUDGELINEMODE but not LINEMODE, - * we'll keep them in char-at-a-time mode. - */ -int turn_on_sga = 0; - -void -dooption(int option) -{ - int changeok = 0; - - /* - * Process client input. - */ - - DIAG(TD_OPTIONS, printoption("td: recv do", option)); - - if (will_wont_resp[option]) { - will_wont_resp[option]--; - if (will_wont_resp[option] && my_state_is_will(option)) - will_wont_resp[option]--; - } - if ((will_wont_resp[option] == 0) && (my_want_state_is_wont(option))) { - switch (option) { - case TELOPT_ECHO: - { - init_termbuf(); - tty_setecho(1); - set_termbuf(); - } - changeok++; - break; - - case TELOPT_BINARY: - init_termbuf(); - tty_binaryout(1); - set_termbuf(); - changeok++; - break; - - case TELOPT_SGA: - turn_on_sga = 0; - changeok++; - break; - - case TELOPT_STATUS: - changeok++; - break; - - case TELOPT_TM: - /* - * Special case for TM. We send a WILL, but - * pretend we sent a WONT. - */ - send_will(option, 0); - set_my_want_state_wont(option); - set_my_state_wont(option); - return; - - case TELOPT_LOGOUT: - /* - * When we get a LOGOUT option, respond - * with a WILL LOGOUT, make sure that - * it gets written out to the network, - * and then just go away... - */ - set_my_want_state_will(TELOPT_LOGOUT); - send_will(TELOPT_LOGOUT, 0); - set_my_state_will(TELOPT_LOGOUT); - netflush(); - cleanup(0); - /* NOT REACHED */ - break; - -#ifdef ENCRYPTION - case TELOPT_ENCRYPT: - changeok++; - break; -#endif - case TELOPT_LINEMODE: - case TELOPT_TTYPE: - case TELOPT_NAWS: - case TELOPT_TSPEED: - case TELOPT_LFLOW: - case TELOPT_XDISPLOC: -#ifdef TELOPT_ENVIRON - case TELOPT_NEW_ENVIRON: -#endif - case TELOPT_OLD_ENVIRON: - default: - break; - } - if (changeok) { - set_my_want_state_will(option); - send_will(option, 0); - } else { - will_wont_resp[option]++; - send_wont(option, 0); - } - } - set_my_state_will(option); - -} /* end of dooption */ - -void -send_wont(int option, int init) -{ - if (init) { - if ((will_wont_resp[option] == 0 && my_state_is_wont(option)) || - my_want_state_is_wont(option)) - return; - set_my_want_state_wont(option); - will_wont_resp[option]++; - } - output_data ((const char *)wont, option); - - DIAG(TD_OPTIONS, printoption("td: send wont", option)); -} - -void -dontoption(int option) -{ - /* - * Process client input. - */ - - - DIAG(TD_OPTIONS, printoption("td: recv dont", 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_BINARY: - init_termbuf(); - tty_binaryout(0); - set_termbuf(); - break; - - case TELOPT_ECHO: /* we should stop echoing */ - { - init_termbuf(); - tty_setecho(0); - set_termbuf(); - } - break; - - case TELOPT_SGA: - set_my_want_state_wont(option); - if (my_state_is_will(option)) - send_wont(option, 0); - set_my_state_wont(option); - if (turn_on_sga ^= 1) - send_will(option, 1); - return; - - default: - break; - } - - set_my_want_state_wont(option); - if (my_state_is_will(option)) - send_wont(option, 0); - } - set_my_state_wont(option); - -} /* end of dontoption */ - -#ifdef ENV_HACK -int env_ovar = -1; -int env_ovalue = -1; -#else /* ENV_HACK */ -# define env_ovar OLD_ENV_VAR -# define env_ovalue OLD_ENV_VALUE -#endif /* ENV_HACK */ - -/* - * suboption() - * - * Look at the sub-option buffer, and try to be helpful to the other - * side. - * - * Currently we recognize: - * - * Terminal type is - * Linemode - * Window size - * Terminal speed - */ -void -suboption(void) -{ - int subchar; - - DIAG(TD_OPTIONS, {netflush(); printsub('<', subpointer, SB_LEN()+2);}); - - subchar = SB_GET(); - switch (subchar) { - case TELOPT_TSPEED: { - int xspeed, rspeed; - - if (his_state_is_wont(TELOPT_TSPEED)) /* Ignore if option disabled */ - break; - - settimer(tspeedsubopt); - - if (SB_EOF() || SB_GET() != TELQUAL_IS) - return; - - xspeed = atoi((char *)subpointer); - - while (SB_GET() != ',' && !SB_EOF()); - if (SB_EOF()) - return; - - rspeed = atoi((char *)subpointer); - clientstat(TELOPT_TSPEED, xspeed, rspeed); - - break; - - } /* end of case TELOPT_TSPEED */ - - case TELOPT_TTYPE: { /* Yaaaay! */ - static char terminalname[41]; - - if (his_state_is_wont(TELOPT_TTYPE)) /* Ignore if option disabled */ - break; - settimer(ttypesubopt); - - if (SB_EOF() || SB_GET() != TELQUAL_IS) { - return; /* ??? XXX but, this is the most robust */ - } - - terminaltype = terminalname; - - while ((terminaltype < (terminalname + sizeof terminalname-1)) && - !SB_EOF()) { - int c; - - c = SB_GET(); - if (isupper(c)) { - c = tolower(c); - } - *terminaltype++ = c; /* accumulate name */ - } - *terminaltype = 0; - terminaltype = terminalname; - break; - } /* end of case TELOPT_TTYPE */ - - case TELOPT_NAWS: { - int xwinsize, ywinsize; - - if (his_state_is_wont(TELOPT_NAWS)) /* Ignore if option disabled */ - break; - - if (SB_EOF()) - return; - xwinsize = SB_GET() << 8; - if (SB_EOF()) - return; - xwinsize |= SB_GET(); - if (SB_EOF()) - return; - ywinsize = SB_GET() << 8; - if (SB_EOF()) - return; - ywinsize |= SB_GET(); - clientstat(TELOPT_NAWS, xwinsize, ywinsize); - - break; - - } /* end of case TELOPT_NAWS */ - - case TELOPT_STATUS: { - int mode; - - if (SB_EOF()) - break; - mode = SB_GET(); - switch (mode) { - case TELQUAL_SEND: - if (my_state_is_will(TELOPT_STATUS)) - send_status(); - break; - - case TELQUAL_IS: - break; - - default: - break; - } - break; - } /* end of case TELOPT_STATUS */ - - case TELOPT_XDISPLOC: { - if (SB_EOF() || SB_GET() != TELQUAL_IS) - return; - settimer(xdisplocsubopt); - subpointer[SB_LEN()] = '\0'; - setenv("DISPLAY", (char *)subpointer, 1); - break; - } /* end of case TELOPT_XDISPLOC */ - -#ifdef TELOPT_NEW_ENVIRON - case TELOPT_NEW_ENVIRON: -#endif - case TELOPT_OLD_ENVIRON: { - int c; - char *cp, *varp, *valp; - - if (SB_EOF()) - return; - c = SB_GET(); - if (c == TELQUAL_IS) { - if (subchar == TELOPT_OLD_ENVIRON) - settimer(oenvironsubopt); - else - settimer(environsubopt); - } else if (c != TELQUAL_INFO) { - return; - } - -#ifdef TELOPT_NEW_ENVIRON - if (subchar == TELOPT_NEW_ENVIRON) { - while (!SB_EOF()) { - c = SB_GET(); - if ((c == NEW_ENV_VAR) || (c == ENV_USERVAR)) - break; - } - } else -#endif - { -#ifdef ENV_HACK - /* - * We only want to do this if we haven't already decided - * whether or not the other side has its VALUE and VAR - * reversed. - */ - if (env_ovar < 0) { - int last = -1; /* invalid value */ - int empty = 0; - int got_var = 0, got_value = 0, got_uservar = 0; - - /* - * The other side might have its VALUE and VAR values - * reversed. To be interoperable, we need to determine - * which way it is. If the first recognized character - * is a VAR or VALUE, then that will tell us what - * type of client it is. If the fist recognized - * character is a USERVAR, then we continue scanning - * the suboption looking for two consecutive - * VAR or VALUE fields. We should not get two - * consecutive VALUE fields, so finding two - * consecutive VALUE or VAR fields will tell us - * what the client is. - */ - SB_SAVE(); - while (!SB_EOF()) { - c = SB_GET(); - switch(c) { - case OLD_ENV_VAR: - if (last < 0 || last == OLD_ENV_VAR - || (empty && (last == OLD_ENV_VALUE))) - goto env_ovar_ok; - got_var++; - last = OLD_ENV_VAR; - break; - case OLD_ENV_VALUE: - if (last < 0 || last == OLD_ENV_VALUE - || (empty && (last == OLD_ENV_VAR))) - goto env_ovar_wrong; - got_value++; - last = OLD_ENV_VALUE; - break; - case ENV_USERVAR: - /* count strings of USERVAR as one */ - if (last != ENV_USERVAR) - got_uservar++; - if (empty) { - if (last == OLD_ENV_VALUE) - goto env_ovar_ok; - if (last == OLD_ENV_VAR) - goto env_ovar_wrong; - } - last = ENV_USERVAR; - break; - case ENV_ESC: - if (!SB_EOF()) - c = SB_GET(); - /* FALL THROUGH */ - default: - empty = 0; - continue; - } - empty = 1; - } - if (empty) { - if (last == OLD_ENV_VALUE) - goto env_ovar_ok; - if (last == OLD_ENV_VAR) - goto env_ovar_wrong; - } - /* - * Ok, the first thing was a USERVAR, and there - * are not two consecutive VAR or VALUE commands, - * and none of the VAR or VALUE commands are empty. - * If the client has sent us a well-formed option, - * then the number of VALUEs received should always - * be less than or equal to the number of VARs and - * USERVARs received. - * - * If we got exactly as many VALUEs as VARs and - * USERVARs, the client has the same definitions. - * - * If we got exactly as many VARs as VALUEs and - * USERVARS, the client has reversed definitions. - */ - if (got_uservar + got_var == got_value) { - env_ovar_ok: - env_ovar = OLD_ENV_VAR; - env_ovalue = OLD_ENV_VALUE; - } else if (got_uservar + got_value == got_var) { - env_ovar_wrong: - env_ovar = OLD_ENV_VALUE; - env_ovalue = OLD_ENV_VAR; - DIAG(TD_OPTIONS, { - output_data("ENVIRON VALUE and VAR are reversed!\r\n"); - }); - - } - } - SB_RESTORE(); -#endif - - while (!SB_EOF()) { - c = SB_GET(); - if ((c == env_ovar) || (c == ENV_USERVAR)) - break; - } - } - - if (SB_EOF()) - return; - - cp = varp = (char *)subpointer; - valp = 0; - - while (!SB_EOF()) { - c = SB_GET(); - if (subchar == TELOPT_OLD_ENVIRON) { - if (c == env_ovar) - c = NEW_ENV_VAR; - else if (c == env_ovalue) - c = NEW_ENV_VALUE; - } - switch (c) { - - case NEW_ENV_VALUE: - *cp = '\0'; - cp = valp = (char *)subpointer; - break; - - case NEW_ENV_VAR: - case ENV_USERVAR: - *cp = '\0'; - if (valp) - setenv(varp, valp, 1); - else - unsetenv(varp); - cp = varp = (char *)subpointer; - valp = 0; - break; - - case ENV_ESC: - if (SB_EOF()) - break; - c = SB_GET(); - /* FALL THROUGH */ - default: - *cp++ = c; - break; - } - } - *cp = '\0'; - if (valp) - setenv(varp, valp, 1); - else - unsetenv(varp); - break; - } /* end of case TELOPT_NEW_ENVIRON */ -#ifdef AUTHENTICATION - case TELOPT_AUTHENTICATION: - if (SB_EOF()) - break; - switch(SB_GET()) { - case TELQUAL_SEND: - case TELQUAL_REPLY: - /* - * These are sent by us and cannot be sent by - * the client. - */ - break; - case TELQUAL_IS: - auth_is(subpointer, SB_LEN()); - break; - case TELQUAL_NAME: - auth_name(subpointer, SB_LEN()); - break; - } - break; -#endif -#ifdef ENCRYPTION - case TELOPT_ENCRYPT: - if (SB_EOF()) - break; - switch(SB_GET()) { - case ENCRYPT_SUPPORT: - encrypt_support(subpointer, SB_LEN()); - break; - case ENCRYPT_IS: - encrypt_is(subpointer, SB_LEN()); - break; - case ENCRYPT_REPLY: - encrypt_reply(subpointer, SB_LEN()); - break; - case ENCRYPT_START: - encrypt_start(subpointer, SB_LEN()); - break; - case ENCRYPT_END: - encrypt_end(); - break; - case ENCRYPT_REQSTART: - encrypt_request_start(subpointer, SB_LEN()); - break; - case ENCRYPT_REQEND: - /* - * We can always send an REQEND so that we cannot - * get stuck encrypting. We should only get this - * if we have been able to get in the correct mode - * anyhow. - */ - encrypt_request_end(); - break; - case ENCRYPT_ENC_KEYID: - encrypt_enc_keyid(subpointer, SB_LEN()); - break; - case ENCRYPT_DEC_KEYID: - encrypt_dec_keyid(subpointer, SB_LEN()); - break; - default: - break; - } - break; -#endif - - default: - break; - } /* end of switch */ - -} /* end of suboption */ - -void -doclientstat(void) -{ - clientstat(TELOPT_LINEMODE, WILL, 0); -} - -#define ADD(c) *ncp++ = c -#define ADD_DATA(c) { *ncp++ = c; if (c == SE || c == IAC) *ncp++ = c; } - -void -send_status(void) -{ - unsigned char statusbuf[256]; - unsigned char *ncp; - unsigned char i; - - ncp = statusbuf; - - netflush(); /* get rid of anything waiting to go out */ - - ADD(IAC); - ADD(SB); - ADD(TELOPT_STATUS); - ADD(TELQUAL_IS); - - /* - * We check the want_state rather than the current state, - * because if we received a DO/WILL for an option that we - * don't support, and the other side didn't send a DONT/WONT - * in response to our WONT/DONT, then the "state" will be - * WILL/DO, and the "want_state" will be WONT/DONT. We - * need to go by the latter. - */ - for (i = 0; i < (unsigned char)NTELOPTS; i++) { - if (my_want_state_is_will(i)) { - ADD(WILL); - ADD_DATA(i); - } - if (his_want_state_is_will(i)) { - ADD(DO); - ADD_DATA(i); - } - } - - if (his_want_state_is_will(TELOPT_LFLOW)) { - ADD(SB); - ADD(TELOPT_LFLOW); - if (flowmode) { - ADD(LFLOW_ON); - } else { - ADD(LFLOW_OFF); - } - ADD(SE); - - if (restartany >= 0) { - ADD(SB); - ADD(TELOPT_LFLOW); - if (restartany) { - ADD(LFLOW_RESTART_ANY); - } else { - ADD(LFLOW_RESTART_XON); - } - ADD(SE); - } - } - - - ADD(IAC); - ADD(SE); - - writenet(statusbuf, ncp - statusbuf); - netflush(); /* Send it on its way */ - - DIAG(TD_OPTIONS, - {printsub('>', statusbuf, ncp - statusbuf); netflush();}); -} |
