Commit | Line | Data |
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ea139302 | 1 | /* |
4eb3b9d6 KB |
2 | * Copyright (c) 1989, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
ea139302 | 4 | * |
836fe169 | 5 | * %sccs.include.redist.c% |
ea139302 PB |
6 | */ |
7 | ||
8 | #ifndef lint | |
4eb3b9d6 | 9 | static char sccsid[] = "@(#)state.c 8.1 (Berkeley) %G%"; |
ea139302 PB |
10 | #endif /* not lint */ |
11 | ||
12 | #include "telnetd.h" | |
8832c633 | 13 | #if defined(AUTHENTICATION) |
1af3d848 DB |
14 | #include <libtelnet/auth.h> |
15 | #endif | |
ea139302 PB |
16 | |
17 | char doopt[] = { IAC, DO, '%', 'c', 0 }; | |
18 | char dont[] = { IAC, DONT, '%', 'c', 0 }; | |
19 | char will[] = { IAC, WILL, '%', 'c', 0 }; | |
20 | char wont[] = { IAC, WONT, '%', 'c', 0 }; | |
21 | int not42 = 1; | |
22 | ||
23 | /* | |
24 | * Buffer for sub-options, and macros | |
25 | * for suboptions buffer manipulations | |
26 | */ | |
1af3d848 | 27 | unsigned char subbuffer[512], *subpointer= subbuffer, *subend= subbuffer; |
ea139302 | 28 | |
1d23bbc4 | 29 | #define SB_CLEAR() subpointer = subbuffer |
ea139302 PB |
30 | #define SB_TERM() { subend = subpointer; SB_CLEAR(); } |
31 | #define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ | |
32 | *subpointer++ = (c); \ | |
33 | } | |
34 | #define SB_GET() ((*subpointer++)&0xff) | |
35 | #define SB_EOF() (subpointer >= subend) | |
4a8a7128 | 36 | #define SB_LEN() (subend - subpointer) |
ea139302 | 37 | |
1d23bbc4 DB |
38 | #ifdef ENV_HACK |
39 | unsigned char *subsave; | |
40 | #define SB_SAVE() subsave = subpointer; | |
41 | #define SB_RESTORE() subpointer = subsave; | |
42 | #endif | |
ea139302 PB |
43 | |
44 | ||
45 | /* | |
46 | * State for recv fsm | |
47 | */ | |
48 | #define TS_DATA 0 /* base state */ | |
49 | #define TS_IAC 1 /* look for double IAC's */ | |
50 | #define TS_CR 2 /* CR-LF ->'s CR */ | |
51 | #define TS_SB 3 /* throw away begin's... */ | |
52 | #define TS_SE 4 /* ...end's (suboption negotiation) */ | |
53 | #define TS_WILL 5 /* will option negotiation */ | |
54 | #define TS_WONT 6 /* wont " */ | |
55 | #define TS_DO 7 /* do " */ | |
56 | #define TS_DONT 8 /* dont " */ | |
57 | ||
1af3d848 | 58 | void |
ea139302 PB |
59 | telrcv() |
60 | { | |
61 | register int c; | |
62 | static int state = TS_DATA; | |
ed8f31c1 | 63 | #if defined(CRAY2) && defined(UNICOS5) |
ea139302 PB |
64 | char *opfrontp = pfrontp; |
65 | #endif | |
66 | ||
67 | while (ncc > 0) { | |
68 | if ((&ptyobuf[BUFSIZ] - pfrontp) < 2) | |
69 | break; | |
70 | c = *netip++ & 0377, ncc--; | |
258d091a | 71 | #ifdef ENCRYPTION |
1af3d848 DB |
72 | if (decrypt_input) |
73 | c = (*decrypt_input)(c); | |
258d091a | 74 | #endif /* ENCRYPTION */ |
ea139302 PB |
75 | switch (state) { |
76 | ||
77 | case TS_CR: | |
78 | state = TS_DATA; | |
79 | /* Strip off \n or \0 after a \r */ | |
80 | if ((c == 0) || (c == '\n')) { | |
81 | break; | |
82 | } | |
83 | /* FALL THROUGH */ | |
84 | ||
85 | case TS_DATA: | |
86 | if (c == IAC) { | |
87 | state = TS_IAC; | |
88 | break; | |
89 | } | |
90 | /* | |
91 | * We now map \r\n ==> \r for pragmatic reasons. | |
92 | * Many client implementations send \r\n when | |
93 | * the user hits the CarriageReturn key. | |
94 | * | |
95 | * We USED to map \r\n ==> \n, since \r\n says | |
96 | * that we want to be in column 1 of the next | |
97 | * printable line, and \n is the standard | |
98 | * unix way of saying that (\r is only good | |
99 | * if CRMOD is set, which it normally is). | |
100 | */ | |
4a8a7128 | 101 | if ((c == '\r') && his_state_is_wont(TELOPT_BINARY)) { |
1af3d848 | 102 | int nc = *netip; |
258d091a | 103 | #ifdef ENCRYPTION |
1af3d848 DB |
104 | if (decrypt_input) |
105 | nc = (*decrypt_input)(nc & 0xff); | |
258d091a | 106 | #endif /* ENCRYPTION */ |
1af3d848 | 107 | #ifdef LINEMODE |
ea139302 PB |
108 | /* |
109 | * If we are operating in linemode, | |
110 | * convert to local end-of-line. | |
111 | */ | |
1af3d848 DB |
112 | if (linemode && (ncc > 0) && (('\n' == nc) || |
113 | ((0 == nc) && tty_iscrnl())) ) { | |
ea139302 PB |
114 | netip++; ncc--; |
115 | c = '\n'; | |
1af3d848 DB |
116 | } else |
117 | #endif | |
118 | { | |
258d091a | 119 | #ifdef ENCRYPTION |
1af3d848 DB |
120 | if (decrypt_input) |
121 | (void)(*decrypt_input)(-1); | |
258d091a | 122 | #endif /* ENCRYPTION */ |
ea139302 PB |
123 | state = TS_CR; |
124 | } | |
125 | } | |
126 | *pfrontp++ = c; | |
127 | break; | |
128 | ||
129 | case TS_IAC: | |
130 | gotiac: switch (c) { | |
131 | ||
132 | /* | |
133 | * Send the process on the pty side an | |
134 | * interrupt. Do this with a NULL or | |
135 | * interrupt char; depending on the tty mode. | |
136 | */ | |
137 | case IP: | |
1af3d848 DB |
138 | DIAG(TD_OPTIONS, |
139 | printoption("td: recv IAC", c)); | |
ea139302 PB |
140 | interrupt(); |
141 | break; | |
142 | ||
143 | case BREAK: | |
1af3d848 DB |
144 | DIAG(TD_OPTIONS, |
145 | printoption("td: recv IAC", c)); | |
ea139302 PB |
146 | sendbrk(); |
147 | break; | |
148 | ||
149 | /* | |
150 | * Are You There? | |
151 | */ | |
152 | case AYT: | |
1af3d848 DB |
153 | DIAG(TD_OPTIONS, |
154 | printoption("td: recv IAC", c)); | |
2c9c7136 | 155 | recv_ayt(); |
ea139302 PB |
156 | break; |
157 | ||
158 | /* | |
159 | * Abort Output | |
160 | */ | |
161 | case AO: | |
162 | { | |
1af3d848 DB |
163 | DIAG(TD_OPTIONS, |
164 | printoption("td: recv IAC", c)); | |
ea139302 PB |
165 | ptyflush(); /* half-hearted */ |
166 | init_termbuf(); | |
167 | ||
168 | if (slctab[SLC_AO].sptr && | |
2c9c7136 | 169 | *slctab[SLC_AO].sptr != (cc_t)(_POSIX_VDISABLE)) { |
ed8f31c1 PB |
170 | *pfrontp++ = |
171 | (unsigned char)*slctab[SLC_AO].sptr; | |
ea139302 PB |
172 | } |
173 | ||
174 | netclear(); /* clear buffer back */ | |
175 | *nfrontp++ = IAC; | |
176 | *nfrontp++ = DM; | |
177 | neturg = nfrontp-1; /* off by one XXX */ | |
1af3d848 DB |
178 | DIAG(TD_OPTIONS, |
179 | printoption("td: send IAC", DM)); | |
ea139302 PB |
180 | break; |
181 | } | |
182 | ||
183 | /* | |
184 | * Erase Character and | |
185 | * Erase Line | |
186 | */ | |
187 | case EC: | |
188 | case EL: | |
189 | { | |
ed8f31c1 | 190 | cc_t ch; |
ea139302 | 191 | |
1af3d848 DB |
192 | DIAG(TD_OPTIONS, |
193 | printoption("td: recv IAC", c)); | |
ea139302 PB |
194 | ptyflush(); /* half-hearted */ |
195 | init_termbuf(); | |
4a8a7128 PB |
196 | if (c == EC) |
197 | ch = *slctab[SLC_EC].sptr; | |
198 | else | |
199 | ch = *slctab[SLC_EL].sptr; | |
2c9c7136 | 200 | if (ch != (cc_t)(_POSIX_VDISABLE)) |
ed8f31c1 | 201 | *pfrontp++ = (unsigned char)ch; |
ea139302 PB |
202 | break; |
203 | } | |
204 | ||
205 | /* | |
206 | * Check for urgent data... | |
207 | */ | |
208 | case DM: | |
1af3d848 DB |
209 | DIAG(TD_OPTIONS, |
210 | printoption("td: recv IAC", c)); | |
ea139302 PB |
211 | SYNCHing = stilloob(net); |
212 | settimer(gotDM); | |
213 | break; | |
214 | ||
215 | ||
216 | /* | |
217 | * Begin option subnegotiation... | |
218 | */ | |
219 | case SB: | |
220 | state = TS_SB; | |
221 | SB_CLEAR(); | |
222 | continue; | |
223 | ||
224 | case WILL: | |
225 | state = TS_WILL; | |
226 | continue; | |
227 | ||
228 | case WONT: | |
229 | state = TS_WONT; | |
230 | continue; | |
231 | ||
232 | case DO: | |
233 | state = TS_DO; | |
234 | continue; | |
235 | ||
236 | case DONT: | |
237 | state = TS_DONT; | |
238 | continue; | |
239 | case EOR: | |
4a8a7128 | 240 | if (his_state_is_will(TELOPT_EOR)) |
ea139302 PB |
241 | doeof(); |
242 | break; | |
243 | ||
244 | /* | |
245 | * Handle RFC 10xx Telnet linemode option additions | |
246 | * to command stream (EOF, SUSP, ABORT). | |
247 | */ | |
248 | case xEOF: | |
249 | doeof(); | |
250 | break; | |
251 | ||
252 | case SUSP: | |
253 | sendsusp(); | |
254 | break; | |
255 | ||
256 | case ABORT: | |
257 | sendbrk(); | |
258 | break; | |
259 | ||
260 | case IAC: | |
261 | *pfrontp++ = c; | |
262 | break; | |
263 | } | |
264 | state = TS_DATA; | |
265 | break; | |
266 | ||
267 | case TS_SB: | |
268 | if (c == IAC) { | |
269 | state = TS_SE; | |
270 | } else { | |
271 | SB_ACCUM(c); | |
272 | } | |
273 | break; | |
274 | ||
275 | case TS_SE: | |
276 | if (c != SE) { | |
277 | if (c != IAC) { | |
278 | /* | |
279 | * bad form of suboption negotiation. | |
280 | * handle it in such a way as to avoid | |
281 | * damage to local state. Parse | |
282 | * suboption buffer found so far, | |
283 | * then treat remaining stream as | |
284 | * another command sequence. | |
285 | */ | |
1af3d848 DB |
286 | |
287 | /* for DIAGNOSTICS */ | |
4a8a7128 PB |
288 | SB_ACCUM(IAC); |
289 | SB_ACCUM(c); | |
290 | subpointer -= 2; | |
1af3d848 | 291 | |
ea139302 PB |
292 | SB_TERM(); |
293 | suboption(); | |
294 | state = TS_IAC; | |
295 | goto gotiac; | |
296 | } | |
297 | SB_ACCUM(c); | |
298 | state = TS_SB; | |
299 | } else { | |
1af3d848 | 300 | /* for DIAGNOSTICS */ |
4a8a7128 PB |
301 | SB_ACCUM(IAC); |
302 | SB_ACCUM(SE); | |
303 | subpointer -= 2; | |
1af3d848 | 304 | |
ea139302 PB |
305 | SB_TERM(); |
306 | suboption(); /* handle sub-option */ | |
307 | state = TS_DATA; | |
308 | } | |
309 | break; | |
310 | ||
311 | case TS_WILL: | |
053fd49d | 312 | willoption(c); |
ea139302 PB |
313 | state = TS_DATA; |
314 | continue; | |
315 | ||
316 | case TS_WONT: | |
053fd49d | 317 | wontoption(c); |
ea139302 PB |
318 | state = TS_DATA; |
319 | continue; | |
320 | ||
321 | case TS_DO: | |
053fd49d | 322 | dooption(c); |
ea139302 PB |
323 | state = TS_DATA; |
324 | continue; | |
325 | ||
326 | case TS_DONT: | |
053fd49d | 327 | dontoption(c); |
ea139302 PB |
328 | state = TS_DATA; |
329 | continue; | |
330 | ||
331 | default: | |
332 | syslog(LOG_ERR, "telnetd: panic state=%d\n", state); | |
333 | printf("telnetd: panic state=%d\n", state); | |
334 | exit(1); | |
335 | } | |
336 | } | |
ed8f31c1 | 337 | #if defined(CRAY2) && defined(UNICOS5) |
ea139302 PB |
338 | if (!linemode) { |
339 | char xptyobuf[BUFSIZ+NETSLOP]; | |
340 | char xbuf2[BUFSIZ]; | |
341 | register char *cp; | |
342 | int n = pfrontp - opfrontp, oc; | |
343 | bcopy(opfrontp, xptyobuf, n); | |
344 | pfrontp = opfrontp; | |
345 | pfrontp += term_input(xptyobuf, pfrontp, n, BUFSIZ+NETSLOP, | |
346 | xbuf2, &oc, BUFSIZ); | |
347 | for (cp = xbuf2; oc > 0; --oc) | |
348 | if ((*nfrontp++ = *cp++) == IAC) | |
349 | *nfrontp++ = IAC; | |
350 | } | |
ed8f31c1 | 351 | #endif /* defined(CRAY2) && defined(UNICOS5) */ |
ea139302 PB |
352 | } /* end of telrcv */ |
353 | ||
354 | /* | |
355 | * The will/wont/do/dont state machines are based on Dave Borman's | |
4a8a7128 | 356 | * Telnet option processing state machine. |
ea139302 PB |
357 | * |
358 | * These correspond to the following states: | |
359 | * my_state = the last negotiated state | |
360 | * want_state = what I want the state to go to | |
361 | * want_resp = how many requests I have sent | |
362 | * All state defaults are negative, and resp defaults to 0. | |
363 | * | |
364 | * When initiating a request to change state to new_state: | |
365 | * | |
366 | * if ((want_resp == 0 && new_state == my_state) || want_state == new_state) { | |
367 | * do nothing; | |
368 | * } else { | |
369 | * want_state = new_state; | |
370 | * send new_state; | |
371 | * want_resp++; | |
372 | * } | |
373 | * | |
374 | * When receiving new_state: | |
375 | * | |
376 | * if (want_resp) { | |
377 | * want_resp--; | |
378 | * if (want_resp && (new_state == my_state)) | |
379 | * want_resp--; | |
380 | * } | |
381 | * if ((want_resp == 0) && (new_state != want_state)) { | |
382 | * if (ok_to_switch_to new_state) | |
383 | * want_state = new_state; | |
384 | * else | |
385 | * want_resp++; | |
386 | * send want_state; | |
387 | * } | |
388 | * my_state = new_state; | |
389 | * | |
390 | * Note that new_state is implied in these functions by the function itself. | |
391 | * will and do imply positive new_state, wont and dont imply negative. | |
392 | * | |
393 | * Finally, there is one catch. If we send a negative response to a | |
394 | * positive request, my_state will be the positive while want_state will | |
395 | * remain negative. my_state will revert to negative when the negative | |
396 | * acknowlegment arrives from the peer. Thus, my_state generally tells | |
397 | * us not only the last negotiated state, but also tells us what the peer | |
398 | * wants to be doing as well. It is important to understand this difference | |
399 | * as we may wish to be processing data streams based on our desired state | |
400 | * (want_state) or based on what the peer thinks the state is (my_state). | |
401 | * | |
402 | * This all works fine because if the peer sends a positive request, the data | |
403 | * that we receive prior to negative acknowlegment will probably be affected | |
404 | * by the positive state, and we can process it as such (if we can; if we | |
405 | * can't then it really doesn't matter). If it is that important, then the | |
406 | * peer probably should be buffering until this option state negotiation | |
407 | * is complete. | |
408 | * | |
ea139302 | 409 | */ |
1af3d848 | 410 | void |
053fd49d PB |
411 | send_do(option, init) |
412 | int option, init; | |
413 | { | |
414 | if (init) { | |
4a8a7128 PB |
415 | if ((do_dont_resp[option] == 0 && his_state_is_will(option)) || |
416 | his_want_state_is_will(option)) | |
053fd49d | 417 | return; |
cb781470 PB |
418 | /* |
419 | * Special case for TELOPT_TM: We send a DO, but pretend | |
420 | * that we sent a DONT, so that we can send more DOs if | |
421 | * we want to. | |
422 | */ | |
423 | if (option == TELOPT_TM) | |
4a8a7128 | 424 | set_his_want_state_wont(option); |
cb781470 | 425 | else |
4a8a7128 | 426 | set_his_want_state_will(option); |
053fd49d PB |
427 | do_dont_resp[option]++; |
428 | } | |
429 | (void) sprintf(nfrontp, doopt, option); | |
430 | nfrontp += sizeof (dont) - 2; | |
1af3d848 DB |
431 | |
432 | DIAG(TD_OPTIONS, printoption("td: send do", option)); | |
053fd49d PB |
433 | } |
434 | ||
8832c633 | 435 | #ifdef AUTHENTICATION |
1af3d848 DB |
436 | extern void auth_request(); |
437 | #endif | |
438 | #ifdef LINEMODE | |
439 | extern void doclientstat(); | |
440 | #endif | |
8832c633 | 441 | #ifdef ENCRYPTION |
1af3d848 | 442 | extern void encrypt_send_support(); |
258d091a | 443 | #endif /* ENCRYPTION */ |
1af3d848 DB |
444 | |
445 | void | |
053fd49d PB |
446 | willoption(option) |
447 | int option; | |
ea139302 PB |
448 | { |
449 | int changeok = 0; | |
1af3d848 | 450 | void (*func)() = 0; |
ea139302 | 451 | |
053fd49d PB |
452 | /* |
453 | * process input from peer. | |
454 | */ | |
455 | ||
1af3d848 | 456 | DIAG(TD_OPTIONS, printoption("td: recv will", option)); |
4a8a7128 | 457 | |
053fd49d PB |
458 | if (do_dont_resp[option]) { |
459 | do_dont_resp[option]--; | |
4a8a7128 | 460 | if (do_dont_resp[option] && his_state_is_will(option)) |
053fd49d PB |
461 | do_dont_resp[option]--; |
462 | } | |
cb781470 | 463 | if (do_dont_resp[option] == 0) { |
4a8a7128 | 464 | if (his_want_state_is_wont(option)) { |
ea139302 PB |
465 | switch (option) { |
466 | ||
467 | case TELOPT_BINARY: | |
468 | init_termbuf(); | |
469 | tty_binaryin(1); | |
470 | set_termbuf(); | |
471 | changeok++; | |
472 | break; | |
473 | ||
474 | case TELOPT_ECHO: | |
ea139302 | 475 | /* |
4a8a7128 | 476 | * See comments below for more info. |
ea139302 | 477 | */ |
4a8a7128 | 478 | not42 = 0; /* looks like a 4.2 system */ |
ea139302 PB |
479 | break; |
480 | ||
481 | case TELOPT_TM: | |
482 | #if defined(LINEMODE) && defined(KLUDGELINEMODE) | |
483 | /* | |
053fd49d PB |
484 | * This telnetd implementation does not really |
485 | * support timing marks, it just uses them to | |
486 | * support the kludge linemode stuff. If we | |
487 | * receive a will or wont TM in response to our | |
488 | * do TM request that may have been sent to | |
489 | * determine kludge linemode support, process | |
490 | * it, otherwise TM should get a negative | |
491 | * response back. | |
ea139302 PB |
492 | */ |
493 | /* | |
494 | * Handle the linemode kludge stuff. | |
495 | * If we are not currently supporting any | |
496 | * linemode at all, then we assume that this | |
497 | * is the client telling us to use kludge | |
498 | * linemode in response to our query. Set the | |
499 | * linemode type that is to be supported, note | |
500 | * that the client wishes to use linemode, and | |
501 | * eat the will TM as though it never arrived. | |
502 | */ | |
503 | if (lmodetype < KLUDGE_LINEMODE) { | |
504 | lmodetype = KLUDGE_LINEMODE; | |
505 | clientstat(TELOPT_LINEMODE, WILL, 0); | |
053fd49d | 506 | send_wont(TELOPT_SGA, 1); |
8832c633 DB |
507 | } else if (lmodetype == NO_AUTOKLUDGE) { |
508 | lmodetype = KLUDGE_OK; | |
ea139302 PB |
509 | } |
510 | #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ | |
511 | /* | |
cb781470 | 512 | * We never respond to a WILL TM, and |
4a8a7128 | 513 | * we leave the state WONT. |
ea139302 | 514 | */ |
ea139302 PB |
515 | return; |
516 | ||
517 | case TELOPT_LFLOW: | |
518 | /* | |
053fd49d PB |
519 | * If we are going to support flow control |
520 | * option, then don't worry peer that we can't | |
521 | * change the flow control characters. | |
ea139302 PB |
522 | */ |
523 | slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS; | |
524 | slctab[SLC_XON].defset.flag |= SLC_DEFAULT; | |
525 | slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS; | |
526 | slctab[SLC_XOFF].defset.flag |= SLC_DEFAULT; | |
527 | case TELOPT_TTYPE: | |
528 | case TELOPT_SGA: | |
529 | case TELOPT_NAWS: | |
530 | case TELOPT_TSPEED: | |
4a8a7128 PB |
531 | case TELOPT_XDISPLOC: |
532 | case TELOPT_ENVIRON: | |
cb781470 PB |
533 | changeok++; |
534 | break; | |
535 | ||
ea139302 PB |
536 | #ifdef LINEMODE |
537 | case TELOPT_LINEMODE: | |
cb781470 PB |
538 | # ifdef KLUDGELINEMODE |
539 | /* | |
540 | * Note client's desire to use linemode. | |
541 | */ | |
542 | lmodetype = REAL_LINEMODE; | |
543 | # endif /* KLUDGELINEMODE */ | |
1af3d848 DB |
544 | func = doclientstat; |
545 | changeok++; | |
546 | break; | |
cb781470 | 547 | #endif /* LINEMODE */ |
ea139302 | 548 | |
8832c633 | 549 | #ifdef AUTHENTICATION |
1af3d848 DB |
550 | case TELOPT_AUTHENTICATION: |
551 | func = auth_request; | |
552 | changeok++; | |
553 | break; | |
554 | #endif | |
555 | ||
8832c633 | 556 | #ifdef ENCRYPTION |
1af3d848 DB |
557 | case TELOPT_ENCRYPT: |
558 | func = encrypt_send_support; | |
559 | changeok++; | |
560 | break; | |
258d091a | 561 | #endif /* ENCRYPTION */ |
1af3d848 | 562 | |
ea139302 PB |
563 | default: |
564 | break; | |
565 | } | |
053fd49d | 566 | if (changeok) { |
4a8a7128 | 567 | set_his_want_state_will(option); |
053fd49d PB |
568 | send_do(option, 0); |
569 | } else { | |
570 | do_dont_resp[option]++; | |
571 | send_dont(option, 0); | |
ea139302 | 572 | } |
4a8a7128 PB |
573 | } else { |
574 | /* | |
575 | * Option processing that should happen when | |
576 | * we receive conformation of a change in | |
577 | * state that we had requested. | |
578 | */ | |
579 | switch (option) { | |
580 | case TELOPT_ECHO: | |
581 | not42 = 0; /* looks like a 4.2 system */ | |
582 | /* | |
583 | * Egads, he responded "WILL ECHO". Turn | |
584 | * it off right now! | |
585 | */ | |
586 | send_dont(option, 1); | |
587 | /* | |
588 | * "WILL ECHO". Kludge upon kludge! | |
589 | * A 4.2 client is now echoing user input at | |
590 | * the tty. This is probably undesireable and | |
591 | * it should be stopped. The client will | |
592 | * respond WONT TM to the DO TM that we send to | |
593 | * check for kludge linemode. When the WONT TM | |
594 | * arrives, linemode will be turned off and a | |
595 | * change propogated to the pty. This change | |
596 | * will cause us to process the new pty state | |
597 | * in localstat(), which will notice that | |
598 | * linemode is off and send a WILL ECHO | |
599 | * so that we are properly in character mode and | |
600 | * all is well. | |
601 | */ | |
602 | break; | |
603 | #ifdef LINEMODE | |
604 | case TELOPT_LINEMODE: | |
605 | # ifdef KLUDGELINEMODE | |
606 | /* | |
607 | * Note client's desire to use linemode. | |
608 | */ | |
609 | lmodetype = REAL_LINEMODE; | |
610 | # endif /* KLUDGELINEMODE */ | |
1af3d848 DB |
611 | func = doclientstat; |
612 | break; | |
4a8a7128 | 613 | #endif /* LINEMODE */ |
1af3d848 | 614 | |
8832c633 | 615 | #ifdef AUTHENTICATION |
1af3d848 DB |
616 | case TELOPT_AUTHENTICATION: |
617 | func = auth_request; | |
618 | break; | |
619 | #endif | |
620 | ||
8832c633 | 621 | #ifdef ENCRYPTION |
1af3d848 DB |
622 | case TELOPT_ENCRYPT: |
623 | func = encrypt_send_support; | |
624 | break; | |
258d091a | 625 | #endif /* ENCRYPTION */ |
d0ea7f12 | 626 | case TELOPT_LFLOW: |
1d23bbc4 | 627 | func = flowstat; |
d0ea7f12 | 628 | break; |
4a8a7128 | 629 | } |
cb781470 | 630 | } |
ea139302 | 631 | } |
4a8a7128 | 632 | set_his_state_will(option); |
1af3d848 DB |
633 | if (func) |
634 | (*func)(); | |
ea139302 PB |
635 | } /* end of willoption */ |
636 | ||
1af3d848 | 637 | void |
053fd49d PB |
638 | send_dont(option, init) |
639 | int option, init; | |
640 | { | |
641 | if (init) { | |
4a8a7128 PB |
642 | if ((do_dont_resp[option] == 0 && his_state_is_wont(option)) || |
643 | his_want_state_is_wont(option)) | |
053fd49d | 644 | return; |
4a8a7128 | 645 | set_his_want_state_wont(option); |
053fd49d PB |
646 | do_dont_resp[option]++; |
647 | } | |
648 | (void) sprintf(nfrontp, dont, option); | |
649 | nfrontp += sizeof (doopt) - 2; | |
1af3d848 DB |
650 | |
651 | DIAG(TD_OPTIONS, printoption("td: send dont", option)); | |
053fd49d PB |
652 | } |
653 | ||
1af3d848 | 654 | void |
053fd49d PB |
655 | wontoption(option) |
656 | int option; | |
ea139302 | 657 | { |
ea139302 PB |
658 | /* |
659 | * Process client input. | |
660 | */ | |
053fd49d | 661 | |
1af3d848 | 662 | DIAG(TD_OPTIONS, printoption("td: recv wont", option)); |
4a8a7128 | 663 | |
053fd49d PB |
664 | if (do_dont_resp[option]) { |
665 | do_dont_resp[option]--; | |
4a8a7128 | 666 | if (do_dont_resp[option] && his_state_is_wont(option)) |
053fd49d PB |
667 | do_dont_resp[option]--; |
668 | } | |
cb781470 | 669 | if (do_dont_resp[option] == 0) { |
4a8a7128 | 670 | if (his_want_state_is_will(option)) { |
053fd49d | 671 | /* it is always ok to change to negative state */ |
ea139302 PB |
672 | switch (option) { |
673 | case TELOPT_ECHO: | |
053fd49d | 674 | not42 = 1; /* doesn't seem to be a 4.2 system */ |
ea139302 PB |
675 | break; |
676 | ||
677 | case TELOPT_BINARY: | |
678 | init_termbuf(); | |
679 | tty_binaryin(0); | |
680 | set_termbuf(); | |
681 | break; | |
682 | ||
683 | #ifdef LINEMODE | |
684 | case TELOPT_LINEMODE: | |
685 | # ifdef KLUDGELINEMODE | |
686 | /* | |
687 | * If real linemode is supported, then client is | |
688 | * asking to turn linemode off. | |
689 | */ | |
4a8a7128 PB |
690 | if (lmodetype != REAL_LINEMODE) |
691 | break; | |
692 | lmodetype = KLUDGE_LINEMODE; | |
ea139302 | 693 | # endif /* KLUDGELINEMODE */ |
4a8a7128 | 694 | clientstat(TELOPT_LINEMODE, WONT, 0); |
ea139302 | 695 | break; |
1af3d848 | 696 | #endif /* LINEMODE */ |
ea139302 PB |
697 | |
698 | case TELOPT_TM: | |
ea139302 | 699 | /* |
053fd49d PB |
700 | * If we get a WONT TM, and had sent a DO TM, |
701 | * don't respond with a DONT TM, just leave it | |
702 | * as is. Short circut the state machine to | |
cb781470 | 703 | * achive this. |
ea139302 | 704 | */ |
4a8a7128 | 705 | set_his_want_state_wont(TELOPT_TM); |
ea139302 PB |
706 | return; |
707 | ||
708 | case TELOPT_LFLOW: | |
709 | /* | |
053fd49d PB |
710 | * If we are not going to support flow control |
711 | * option, then let peer know that we can't | |
712 | * change the flow control characters. | |
ea139302 PB |
713 | */ |
714 | slctab[SLC_XON].defset.flag &= ~SLC_LEVELBITS; | |
715 | slctab[SLC_XON].defset.flag |= SLC_CANTCHANGE; | |
716 | slctab[SLC_XOFF].defset.flag &= ~SLC_LEVELBITS; | |
717 | slctab[SLC_XOFF].defset.flag |= SLC_CANTCHANGE; | |
718 | break; | |
719 | ||
8832c633 | 720 | #if defined(AUTHENTICATION) |
1af3d848 DB |
721 | case TELOPT_AUTHENTICATION: |
722 | auth_finished(0, AUTH_REJECT); | |
723 | break; | |
724 | #endif | |
725 | ||
4a8a7128 PB |
726 | /* |
727 | * For options that we might spin waiting for | |
728 | * sub-negotiation, if the client turns off the | |
729 | * option rather than responding to the request, | |
730 | * we have to treat it here as if we got a response | |
731 | * to the sub-negotiation, (by updating the timers) | |
732 | * so that we'll break out of the loop. | |
733 | */ | |
734 | case TELOPT_TTYPE: | |
735 | settimer(ttypesubopt); | |
736 | break; | |
737 | ||
738 | case TELOPT_TSPEED: | |
739 | settimer(tspeedsubopt); | |
740 | break; | |
741 | ||
742 | case TELOPT_XDISPLOC: | |
743 | settimer(xdisplocsubopt); | |
744 | break; | |
745 | ||
746 | case TELOPT_ENVIRON: | |
747 | settimer(environsubopt); | |
748 | break; | |
749 | ||
ea139302 PB |
750 | default: |
751 | break; | |
752 | } | |
4a8a7128 PB |
753 | set_his_want_state_wont(option); |
754 | if (his_state_is_will(option)) | |
755 | send_dont(option, 0); | |
cb781470 PB |
756 | } else { |
757 | switch (option) { | |
758 | case TELOPT_TM: | |
759 | #if defined(LINEMODE) && defined(KLUDGELINEMODE) | |
8832c633 | 760 | if (lmodetype < NO_AUTOKLUDGE) { |
cb781470 PB |
761 | lmodetype = NO_LINEMODE; |
762 | clientstat(TELOPT_LINEMODE, WONT, 0); | |
763 | send_will(TELOPT_SGA, 1); | |
2c9c7136 | 764 | send_will(TELOPT_ECHO, 1); |
cb781470 PB |
765 | } |
766 | #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ | |
1af3d848 DB |
767 | break; |
768 | ||
8832c633 | 769 | #if defined(AUTHENTICATION) |
1af3d848 DB |
770 | case TELOPT_AUTHENTICATION: |
771 | auth_finished(0, AUTH_REJECT); | |
772 | break; | |
773 | #endif | |
cb781470 PB |
774 | default: |
775 | break; | |
776 | } | |
777 | } | |
ea139302 | 778 | } |
4a8a7128 | 779 | set_his_state_wont(option); |
ea139302 | 780 | |
053fd49d | 781 | } /* end of wontoption */ |
ea139302 | 782 | |
1af3d848 | 783 | void |
053fd49d PB |
784 | send_will(option, init) |
785 | int option, init; | |
786 | { | |
787 | if (init) { | |
4a8a7128 PB |
788 | if ((will_wont_resp[option] == 0 && my_state_is_will(option))|| |
789 | my_want_state_is_will(option)) | |
053fd49d | 790 | return; |
4a8a7128 | 791 | set_my_want_state_will(option); |
053fd49d | 792 | will_wont_resp[option]++; |
ea139302 | 793 | } |
053fd49d PB |
794 | (void) sprintf(nfrontp, will, option); |
795 | nfrontp += sizeof (doopt) - 2; | |
1af3d848 DB |
796 | |
797 | DIAG(TD_OPTIONS, printoption("td: send will", option)); | |
053fd49d | 798 | } |
ea139302 | 799 | |
2c9c7136 PB |
800 | #if !defined(LINEMODE) || !defined(KLUDGELINEMODE) |
801 | /* | |
802 | * When we get a DONT SGA, we will try once to turn it | |
803 | * back on. If the other side responds DONT SGA, we | |
804 | * leave it at that. This is so that when we talk to | |
805 | * clients that understand KLUDGELINEMODE but not LINEMODE, | |
806 | * we'll keep them in char-at-a-time mode. | |
807 | */ | |
808 | int turn_on_sga = 0; | |
809 | #endif | |
810 | ||
1af3d848 | 811 | void |
053fd49d PB |
812 | dooption(option) |
813 | int option; | |
ea139302 PB |
814 | { |
815 | int changeok = 0; | |
ea139302 PB |
816 | |
817 | /* | |
818 | * Process client input. | |
819 | */ | |
053fd49d | 820 | |
1af3d848 | 821 | DIAG(TD_OPTIONS, printoption("td: recv do", option)); |
4a8a7128 | 822 | |
053fd49d PB |
823 | if (will_wont_resp[option]) { |
824 | will_wont_resp[option]--; | |
4a8a7128 | 825 | if (will_wont_resp[option] && my_state_is_will(option)) |
053fd49d PB |
826 | will_wont_resp[option]--; |
827 | } | |
4a8a7128 | 828 | if ((will_wont_resp[option] == 0) && (my_want_state_is_wont(option))) { |
ea139302 PB |
829 | switch (option) { |
830 | case TELOPT_ECHO: | |
831 | #ifdef LINEMODE | |
2c9c7136 PB |
832 | # ifdef KLUDGELINEMODE |
833 | if (lmodetype == NO_LINEMODE) | |
834 | # else | |
835 | if (his_state_is_wont(TELOPT_LINEMODE)) | |
836 | # endif | |
ea139302 | 837 | #endif |
2c9c7136 | 838 | { |
ea139302 PB |
839 | init_termbuf(); |
840 | tty_setecho(1); | |
841 | set_termbuf(); | |
ea139302 | 842 | } |
ea139302 PB |
843 | changeok++; |
844 | break; | |
845 | ||
846 | case TELOPT_BINARY: | |
847 | init_termbuf(); | |
848 | tty_binaryout(1); | |
849 | set_termbuf(); | |
850 | changeok++; | |
851 | break; | |
852 | ||
853 | case TELOPT_SGA: | |
854 | #if defined(LINEMODE) && defined(KLUDGELINEMODE) | |
855 | /* | |
053fd49d PB |
856 | * If kludge linemode is in use, then we must |
857 | * process an incoming do SGA for linemode | |
858 | * purposes. | |
ea139302 PB |
859 | */ |
860 | if (lmodetype == KLUDGE_LINEMODE) { | |
861 | /* | |
053fd49d PB |
862 | * Receipt of "do SGA" in kludge |
863 | * linemode is the peer asking us to | |
864 | * turn off linemode. Make note of | |
865 | * the request. | |
ea139302 PB |
866 | */ |
867 | clientstat(TELOPT_LINEMODE, WONT, 0); | |
868 | /* | |
053fd49d PB |
869 | * If linemode did not get turned off |
870 | * then don't tell peer that we did. | |
871 | * Breaking here forces a wont SGA to | |
872 | * be returned. | |
ea139302 PB |
873 | */ |
874 | if (linemode) | |
875 | break; | |
876 | } | |
2c9c7136 PB |
877 | #else |
878 | turn_on_sga = 0; | |
ea139302 PB |
879 | #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ |
880 | changeok++; | |
881 | break; | |
882 | ||
883 | case TELOPT_STATUS: | |
884 | changeok++; | |
885 | break; | |
886 | ||
887 | case TELOPT_TM: | |
053fd49d PB |
888 | /* |
889 | * Special case for TM. We send a WILL, but | |
890 | * pretend we sent a WONT. | |
891 | */ | |
892 | send_will(option, 0); | |
4a8a7128 PB |
893 | set_my_want_state_wont(option); |
894 | set_my_state_wont(option); | |
053fd49d PB |
895 | return; |
896 | ||
1af3d848 DB |
897 | case TELOPT_LOGOUT: |
898 | /* | |
899 | * When we get a LOGOUT option, respond | |
900 | * with a WILL LOGOUT, make sure that | |
901 | * it gets written out to the network, | |
902 | * and then just go away... | |
903 | */ | |
904 | set_my_want_state_will(TELOPT_LOGOUT); | |
905 | send_will(TELOPT_LOGOUT, 0); | |
906 | set_my_state_will(TELOPT_LOGOUT); | |
907 | (void)netflush(); | |
908 | cleanup(0); | |
909 | /* NOT REACHED */ | |
910 | break; | |
911 | ||
258d091a | 912 | #ifdef ENCRYPTION |
1af3d848 DB |
913 | case TELOPT_ENCRYPT: |
914 | changeok++; | |
915 | break; | |
258d091a | 916 | #endif /* ENCRYPTION */ |
ea139302 PB |
917 | case TELOPT_LINEMODE: |
918 | case TELOPT_TTYPE: | |
919 | case TELOPT_NAWS: | |
920 | case TELOPT_TSPEED: | |
921 | case TELOPT_LFLOW: | |
4a8a7128 PB |
922 | case TELOPT_XDISPLOC: |
923 | case TELOPT_ENVIRON: | |
ea139302 PB |
924 | default: |
925 | break; | |
926 | } | |
053fd49d | 927 | if (changeok) { |
4a8a7128 | 928 | set_my_want_state_will(option); |
053fd49d PB |
929 | send_will(option, 0); |
930 | } else { | |
931 | will_wont_resp[option]++; | |
932 | send_wont(option, 0); | |
ea139302 | 933 | } |
ea139302 | 934 | } |
4a8a7128 | 935 | set_my_state_will(option); |
ea139302 PB |
936 | |
937 | } /* end of dooption */ | |
938 | ||
1af3d848 | 939 | void |
053fd49d PB |
940 | send_wont(option, init) |
941 | int option, init; | |
ea139302 | 942 | { |
053fd49d | 943 | if (init) { |
4a8a7128 PB |
944 | if ((will_wont_resp[option] == 0 && my_state_is_wont(option)) || |
945 | my_want_state_is_wont(option)) | |
053fd49d | 946 | return; |
4a8a7128 | 947 | set_my_want_state_wont(option); |
053fd49d PB |
948 | will_wont_resp[option]++; |
949 | } | |
950 | (void) sprintf(nfrontp, wont, option); | |
951 | nfrontp += sizeof (wont) - 2; | |
1af3d848 DB |
952 | |
953 | DIAG(TD_OPTIONS, printoption("td: send wont", option)); | |
053fd49d | 954 | } |
ea139302 | 955 | |
1af3d848 | 956 | void |
053fd49d PB |
957 | dontoption(option) |
958 | int option; | |
959 | { | |
ea139302 PB |
960 | /* |
961 | * Process client input. | |
962 | */ | |
1af3d848 DB |
963 | |
964 | ||
965 | DIAG(TD_OPTIONS, printoption("td: recv dont", option)); | |
ed8f31c1 | 966 | |
053fd49d PB |
967 | if (will_wont_resp[option]) { |
968 | will_wont_resp[option]--; | |
4a8a7128 | 969 | if (will_wont_resp[option] && my_state_is_wont(option)) |
053fd49d PB |
970 | will_wont_resp[option]--; |
971 | } | |
4a8a7128 | 972 | if ((will_wont_resp[option] == 0) && (my_want_state_is_will(option))) { |
ea139302 PB |
973 | switch (option) { |
974 | case TELOPT_BINARY: | |
975 | init_termbuf(); | |
976 | tty_binaryout(0); | |
977 | set_termbuf(); | |
978 | break; | |
979 | ||
053fd49d | 980 | case TELOPT_ECHO: /* we should stop echoing */ |
ea139302 | 981 | #ifdef LINEMODE |
2c9c7136 | 982 | # ifdef KLUDGELINEMODE |
8832c633 DB |
983 | if ((lmodetype != REAL_LINEMODE) && |
984 | (lmodetype != KLUDGE_LINEMODE)) | |
2c9c7136 PB |
985 | # else |
986 | if (his_state_is_wont(TELOPT_LINEMODE)) | |
987 | # endif | |
ea139302 | 988 | #endif |
2c9c7136 | 989 | { |
ea139302 PB |
990 | init_termbuf(); |
991 | tty_setecho(0); | |
992 | set_termbuf(); | |
ea139302 | 993 | } |
ea139302 PB |
994 | break; |
995 | ||
996 | case TELOPT_SGA: | |
997 | #if defined(LINEMODE) && defined(KLUDGELINEMODE) | |
998 | /* | |
053fd49d PB |
999 | * If kludge linemode is in use, then we |
1000 | * must process an incoming do SGA for | |
1001 | * linemode purposes. | |
ea139302 | 1002 | */ |
8832c633 DB |
1003 | if ((lmodetype == KLUDGE_LINEMODE) || |
1004 | (lmodetype == KLUDGE_OK)) { | |
ea139302 | 1005 | /* |
053fd49d PB |
1006 | * The client is asking us to turn |
1007 | * linemode on. | |
ea139302 | 1008 | */ |
8832c633 | 1009 | lmodetype = KLUDGE_LINEMODE; |
ea139302 PB |
1010 | clientstat(TELOPT_LINEMODE, WILL, 0); |
1011 | /* | |
053fd49d PB |
1012 | * If we did not turn line mode on, |
1013 | * then what do we say? Will SGA? | |
1014 | * This violates design of telnet. | |
1015 | * Gross. Very Gross. | |
ea139302 PB |
1016 | */ |
1017 | } | |
2c9c7136 PB |
1018 | break; |
1019 | #else | |
1020 | set_my_want_state_wont(option); | |
1021 | if (my_state_is_will(option)) | |
1022 | send_wont(option, 0); | |
1023 | set_my_state_wont(option); | |
1024 | if (turn_on_sga ^= 1) | |
8832c633 | 1025 | send_will(option, 1); |
2c9c7136 | 1026 | return; |
ea139302 PB |
1027 | #endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ |
1028 | ||
1029 | default: | |
1030 | break; | |
1031 | } | |
ea139302 | 1032 | |
4a8a7128 PB |
1033 | set_my_want_state_wont(option); |
1034 | if (my_state_is_will(option)) | |
1035 | send_wont(option, 0); | |
ea139302 | 1036 | } |
4a8a7128 | 1037 | set_my_state_wont(option); |
ea139302 PB |
1038 | |
1039 | } /* end of dontoption */ | |
1040 | ||
1d23bbc4 DB |
1041 | #ifdef ENV_HACK |
1042 | int env_var = -1; | |
1043 | int env_value = -1; | |
1044 | #else /* ENV_HACK */ | |
1045 | # define env_var ENV_VAR | |
1046 | # define env_value ENV_VALUE | |
1047 | #endif /* ENV_HACK */ | |
1048 | ||
ea139302 PB |
1049 | /* |
1050 | * suboption() | |
1051 | * | |
1052 | * Look at the sub-option buffer, and try to be helpful to the other | |
1053 | * side. | |
1054 | * | |
1055 | * Currently we recognize: | |
1056 | * | |
1057 | * Terminal type is | |
1058 | * Linemode | |
1059 | * Window size | |
1060 | * Terminal speed | |
1061 | */ | |
1af3d848 | 1062 | void |
ea139302 PB |
1063 | suboption() |
1064 | { | |
1065 | register int subchar; | |
1066 | ||
1af3d848 DB |
1067 | DIAG(TD_OPTIONS, {netflush(); printsub('<', subpointer, SB_LEN()+2);}); |
1068 | ||
ea139302 PB |
1069 | subchar = SB_GET(); |
1070 | switch (subchar) { | |
1071 | case TELOPT_TSPEED: { | |
1072 | register int xspeed, rspeed; | |
1073 | ||
4a8a7128 | 1074 | if (his_state_is_wont(TELOPT_TSPEED)) /* Ignore if option disabled */ |
ea139302 PB |
1075 | break; |
1076 | ||
1077 | settimer(tspeedsubopt); | |
1078 | ||
1079 | if (SB_EOF() || SB_GET() != TELQUAL_IS) | |
1080 | return; | |
1081 | ||
1af3d848 | 1082 | xspeed = atoi((char *)subpointer); |
ea139302 PB |
1083 | |
1084 | while (SB_GET() != ',' && !SB_EOF()); | |
1085 | if (SB_EOF()) | |
1086 | return; | |
1087 | ||
1af3d848 | 1088 | rspeed = atoi((char *)subpointer); |
ea139302 PB |
1089 | clientstat(TELOPT_TSPEED, xspeed, rspeed); |
1090 | ||
1091 | break; | |
1092 | ||
1093 | } /* end of case TELOPT_TSPEED */ | |
1094 | ||
1095 | case TELOPT_TTYPE: { /* Yaaaay! */ | |
4a8a7128 | 1096 | static char terminalname[41]; |
ea139302 | 1097 | |
4a8a7128 | 1098 | if (his_state_is_wont(TELOPT_TTYPE)) /* Ignore if option disabled */ |
ea139302 PB |
1099 | break; |
1100 | settimer(ttypesubopt); | |
1101 | ||
1af3d848 | 1102 | if (SB_EOF() || SB_GET() != TELQUAL_IS) { |
ea139302 PB |
1103 | return; /* ??? XXX but, this is the most robust */ |
1104 | } | |
1105 | ||
4a8a7128 | 1106 | terminaltype = terminalname; |
ea139302 PB |
1107 | |
1108 | while ((terminaltype < (terminalname + sizeof terminalname-1)) && | |
1109 | !SB_EOF()) { | |
1110 | register int c; | |
1111 | ||
1112 | c = SB_GET(); | |
1113 | if (isupper(c)) { | |
1114 | c = tolower(c); | |
1115 | } | |
1116 | *terminaltype++ = c; /* accumulate name */ | |
1117 | } | |
1118 | *terminaltype = 0; | |
1119 | terminaltype = terminalname; | |
1120 | break; | |
1121 | } /* end of case TELOPT_TTYPE */ | |
1122 | ||
1123 | case TELOPT_NAWS: { | |
1124 | register int xwinsize, ywinsize; | |
1125 | ||
4a8a7128 | 1126 | if (his_state_is_wont(TELOPT_NAWS)) /* Ignore if option disabled */ |
ea139302 PB |
1127 | break; |
1128 | ||
1129 | if (SB_EOF()) | |
1130 | return; | |
1131 | xwinsize = SB_GET() << 8; | |
1132 | if (SB_EOF()) | |
1133 | return; | |
1134 | xwinsize |= SB_GET(); | |
1135 | if (SB_EOF()) | |
1136 | return; | |
1137 | ywinsize = SB_GET() << 8; | |
1138 | if (SB_EOF()) | |
1139 | return; | |
1140 | ywinsize |= SB_GET(); | |
1141 | clientstat(TELOPT_NAWS, xwinsize, ywinsize); | |
1142 | ||
1143 | break; | |
1144 | ||
1145 | } /* end of case TELOPT_NAWS */ | |
1146 | ||
1147 | #ifdef LINEMODE | |
1148 | case TELOPT_LINEMODE: { | |
1149 | register int request; | |
1150 | ||
4a8a7128 | 1151 | if (his_state_is_wont(TELOPT_LINEMODE)) /* Ignore if option disabled */ |
ea139302 PB |
1152 | break; |
1153 | /* | |
1154 | * Process linemode suboptions. | |
1155 | */ | |
1af3d848 DB |
1156 | if (SB_EOF()) |
1157 | break; /* garbage was sent */ | |
1158 | request = SB_GET(); /* get will/wont */ | |
1159 | ||
1160 | if (SB_EOF()) | |
1161 | break; /* another garbage check */ | |
ea139302 PB |
1162 | |
1163 | if (request == LM_SLC) { /* SLC is not preceeded by WILL or WONT */ | |
1164 | /* | |
1165 | * Process suboption buffer of slc's | |
1166 | */ | |
1167 | start_slc(1); | |
1168 | do_opt_slc(subpointer, subend - subpointer); | |
1af3d848 DB |
1169 | (void) end_slc(0); |
1170 | break; | |
ea139302 | 1171 | } else if (request == LM_MODE) { |
1af3d848 DB |
1172 | if (SB_EOF()) |
1173 | return; | |
ea139302 PB |
1174 | useeditmode = SB_GET(); /* get mode flag */ |
1175 | clientstat(LM_MODE, 0, 0); | |
1af3d848 | 1176 | break; |
ea139302 PB |
1177 | } |
1178 | ||
1af3d848 DB |
1179 | if (SB_EOF()) |
1180 | break; | |
ea139302 PB |
1181 | switch (SB_GET()) { /* what suboption? */ |
1182 | case LM_FORWARDMASK: | |
1183 | /* | |
1184 | * According to spec, only server can send request for | |
1185 | * forwardmask, and client can only return a positive response. | |
1186 | * So don't worry about it. | |
1187 | */ | |
1188 | ||
1189 | default: | |
1190 | break; | |
1191 | } | |
ed8f31c1 | 1192 | break; |
ea139302 PB |
1193 | } /* end of case TELOPT_LINEMODE */ |
1194 | #endif | |
1195 | case TELOPT_STATUS: { | |
1196 | int mode; | |
1197 | ||
1af3d848 DB |
1198 | if (SB_EOF()) |
1199 | break; | |
ea139302 PB |
1200 | mode = SB_GET(); |
1201 | switch (mode) { | |
1202 | case TELQUAL_SEND: | |
4a8a7128 | 1203 | if (my_state_is_will(TELOPT_STATUS)) |
ea139302 PB |
1204 | send_status(); |
1205 | break; | |
1206 | ||
1207 | case TELQUAL_IS: | |
1208 | break; | |
1209 | ||
1210 | default: | |
1211 | break; | |
1212 | } | |
ed8f31c1 PB |
1213 | break; |
1214 | } /* end of case TELOPT_STATUS */ | |
ea139302 | 1215 | |
4a8a7128 PB |
1216 | case TELOPT_XDISPLOC: { |
1217 | if (SB_EOF() || SB_GET() != TELQUAL_IS) | |
1218 | return; | |
1219 | settimer(xdisplocsubopt); | |
1220 | subpointer[SB_LEN()] = '\0'; | |
1af3d848 | 1221 | (void)setenv("DISPLAY", (char *)subpointer, 1); |
4a8a7128 PB |
1222 | break; |
1223 | } /* end of case TELOPT_XDISPLOC */ | |
1224 | ||
1225 | case TELOPT_ENVIRON: { | |
1226 | register int c; | |
1227 | register char *cp, *varp, *valp; | |
1228 | ||
1229 | if (SB_EOF()) | |
1230 | return; | |
1231 | c = SB_GET(); | |
1232 | if (c == TELQUAL_IS) | |
1233 | settimer(environsubopt); | |
1234 | else if (c != TELQUAL_INFO) | |
1235 | return; | |
1236 | ||
1d23bbc4 DB |
1237 | #ifdef ENV_HACK |
1238 | /* | |
1239 | * We only want to do this if we haven't already decided | |
1240 | * whether or not the other side has its VALUE and VAR | |
1241 | * reversed. | |
1242 | */ | |
1243 | if (env_var < 0) { | |
1244 | register int last = -1; /* invalid value */ | |
1245 | int empty = 0; | |
1246 | int got_var = 0, got_value = 0, got_uservar = 0; | |
1247 | ||
1248 | /* | |
1249 | * The other side might have its VALUE and VAR values | |
1250 | * reversed. To be interoperable, we need to determine | |
1251 | * which way it is. If the first recognized character | |
1252 | * is a VAR or VALUE, then that will tell us what | |
1253 | * type of client it is. If the fist recognized | |
1254 | * character is a USERVAR, then we continue scanning | |
1255 | * the suboption looking for two consecutive | |
1256 | * VAR or VALUE fields. We should not get two | |
1257 | * consecutive VALUE fields, so finding two | |
1258 | * consecutive VALUE or VAR fields will tell us | |
1259 | * what the client is. | |
1260 | */ | |
1261 | SB_SAVE(); | |
1262 | while (!SB_EOF()) { | |
1263 | c = SB_GET(); | |
1264 | switch(c) { | |
1265 | case ENV_VAR: | |
1266 | if (last < 0 || last == ENV_VAR | |
1267 | || (empty && (last == ENV_VALUE))) | |
1268 | goto env_var_ok; | |
1269 | got_var++; | |
1270 | last = ENV_VAR; | |
1271 | break; | |
1272 | case ENV_VALUE: | |
1273 | if (last < 0 || last == ENV_VALUE | |
1274 | || (empty && (last == ENV_VAR))) | |
1275 | goto env_var_wrong; | |
1276 | got_value++; | |
1277 | last = ENV_VALUE; | |
1278 | break; | |
1279 | case ENV_USERVAR: | |
1280 | /* count strings of USERVAR as one */ | |
1281 | if (last != ENV_USERVAR) | |
1282 | got_uservar++; | |
1283 | if (empty) { | |
1284 | if (last == ENV_VALUE) | |
1285 | goto env_var_ok; | |
1286 | if (last == ENV_VAR) | |
1287 | goto env_var_wrong; | |
1288 | } | |
1289 | last = ENV_USERVAR; | |
1290 | break; | |
1291 | case ENV_ESC: | |
1292 | if (!SB_EOF()) | |
1293 | c = SB_GET(); | |
1294 | /* FALL THROUGH */ | |
1295 | default: | |
1296 | empty = 0; | |
1297 | continue; | |
1298 | } | |
1299 | empty = 1; | |
1300 | } | |
1301 | if (empty) { | |
1302 | if (last == ENV_VALUE) | |
1303 | goto env_var_ok; | |
1304 | if (last == ENV_VAR) | |
1305 | goto env_var_wrong; | |
1306 | } | |
1307 | /* | |
1308 | * Ok, the first thing was a USERVAR, and there | |
1309 | * are not two consecutive VAR or VALUE commands, | |
1310 | * and none of the VAR or VALUE commands are empty. | |
1311 | * If the client has sent us a well-formed option, | |
1312 | * then the number of VALUEs received should always | |
1313 | * be less than or equal to the number of VARs and | |
1314 | * USERVARs received. | |
1315 | * | |
1316 | * If we got exactly as many VALUEs as VARs and | |
1317 | * USERVARs, the client has the same definitions. | |
1318 | * | |
1d23bbc4 DB |
1319 | * If we got exactly as many VARs as VALUEs and |
1320 | * USERVARS, the client has reversed definitions. | |
1d23bbc4 | 1321 | */ |
258d091a | 1322 | if (got_uservar + got_var == got_value) { |
1d23bbc4 DB |
1323 | env_var_ok: |
1324 | env_var = ENV_VAR; | |
1325 | env_value = ENV_VALUE; | |
258d091a | 1326 | } else if (got_uservar + got_value == got_var) { |
1d23bbc4 DB |
1327 | env_var_wrong: |
1328 | env_var = ENV_VALUE; | |
1329 | env_value = ENV_VAR; | |
1330 | DIAG(TD_OPTIONS, {sprintf(nfrontp, | |
1331 | "ENVIRON VALUE and VAR are reversed!\r\n"); | |
1332 | nfrontp += strlen(nfrontp);}); | |
1333 | ||
1334 | } | |
1335 | } | |
1336 | SB_RESTORE(); | |
1337 | #endif | |
1338 | ||
8832c633 DB |
1339 | while (!SB_EOF()) { |
1340 | c = SB_GET(); | |
1d23bbc4 | 1341 | if ((c == env_var) || (c == ENV_USERVAR)) |
8832c633 DB |
1342 | break; |
1343 | } | |
4a8a7128 PB |
1344 | |
1345 | if (SB_EOF()) | |
1346 | return; | |
1347 | ||
1af3d848 | 1348 | cp = varp = (char *)subpointer; |
4a8a7128 PB |
1349 | valp = 0; |
1350 | ||
1351 | while (!SB_EOF()) { | |
1d23bbc4 DB |
1352 | c = SB_GET(); |
1353 | #ifdef ENV_HACK | |
1354 | if (c == env_var) | |
1355 | c = ENV_VAR; | |
1356 | else if (c == env_value) | |
1357 | c = ENV_VALUE; | |
1358 | #endif | |
1359 | switch (c) { | |
1360 | ||
4a8a7128 PB |
1361 | case ENV_VALUE: |
1362 | *cp = '\0'; | |
1af3d848 | 1363 | cp = valp = (char *)subpointer; |
4a8a7128 PB |
1364 | break; |
1365 | ||
1366 | case ENV_VAR: | |
8832c633 | 1367 | case ENV_USERVAR: |
4a8a7128 PB |
1368 | *cp = '\0'; |
1369 | if (valp) | |
1af3d848 | 1370 | (void)setenv(varp, valp, 1); |
4a8a7128 PB |
1371 | else |
1372 | unsetenv(varp); | |
1af3d848 | 1373 | cp = varp = (char *)subpointer; |
4a8a7128 PB |
1374 | valp = 0; |
1375 | break; | |
1376 | ||
1377 | case ENV_ESC: | |
1378 | if (SB_EOF()) | |
1379 | break; | |
1380 | c = SB_GET(); | |
1381 | /* FALL THROUGH */ | |
1382 | default: | |
1383 | *cp++ = c; | |
1384 | break; | |
1385 | } | |
1386 | } | |
1387 | *cp = '\0'; | |
1388 | if (valp) | |
1af3d848 | 1389 | (void)setenv(varp, valp, 1); |
4a8a7128 PB |
1390 | else |
1391 | unsetenv(varp); | |
1392 | break; | |
1393 | } /* end of case TELOPT_ENVIRON */ | |
8832c633 | 1394 | #if defined(AUTHENTICATION) |
1af3d848 DB |
1395 | case TELOPT_AUTHENTICATION: |
1396 | if (SB_EOF()) | |
1397 | break; | |
1398 | switch(SB_GET()) { | |
1399 | case TELQUAL_SEND: | |
1400 | case TELQUAL_REPLY: | |
1401 | /* | |
1402 | * These are sent by us and cannot be sent by | |
1403 | * the client. | |
1404 | */ | |
1405 | break; | |
1406 | case TELQUAL_IS: | |
1407 | auth_is(subpointer, SB_LEN()); | |
1408 | break; | |
b7c8f459 DB |
1409 | case TELQUAL_NAME: |
1410 | auth_name(subpointer, SB_LEN()); | |
1411 | break; | |
1af3d848 DB |
1412 | } |
1413 | break; | |
1414 | #endif | |
258d091a | 1415 | #ifdef ENCRYPTION |
1af3d848 DB |
1416 | case TELOPT_ENCRYPT: |
1417 | if (SB_EOF()) | |
1418 | break; | |
1419 | switch(SB_GET()) { | |
1420 | case ENCRYPT_SUPPORT: | |
1421 | encrypt_support(subpointer, SB_LEN()); | |
1422 | break; | |
1423 | case ENCRYPT_IS: | |
1424 | encrypt_is(subpointer, SB_LEN()); | |
1425 | break; | |
1426 | case ENCRYPT_REPLY: | |
1427 | encrypt_reply(subpointer, SB_LEN()); | |
1428 | break; | |
1429 | case ENCRYPT_START: | |
b7c8f459 | 1430 | encrypt_start(subpointer, SB_LEN()); |
1af3d848 DB |
1431 | break; |
1432 | case ENCRYPT_END: | |
1433 | encrypt_end(); | |
1434 | break; | |
1435 | case ENCRYPT_REQSTART: | |
b7c8f459 | 1436 | encrypt_request_start(subpointer, SB_LEN()); |
1af3d848 DB |
1437 | break; |
1438 | case ENCRYPT_REQEND: | |
1439 | /* | |
1440 | * We can always send an REQEND so that we cannot | |
1441 | * get stuck encrypting. We should only get this | |
1442 | * if we have been able to get in the correct mode | |
1443 | * anyhow. | |
1444 | */ | |
1445 | encrypt_request_end(); | |
1446 | break; | |
b7c8f459 DB |
1447 | case ENCRYPT_ENC_KEYID: |
1448 | encrypt_enc_keyid(subpointer, SB_LEN()); | |
1449 | break; | |
1450 | case ENCRYPT_DEC_KEYID: | |
1451 | encrypt_dec_keyid(subpointer, SB_LEN()); | |
1452 | break; | |
1af3d848 DB |
1453 | default: |
1454 | break; | |
1455 | } | |
1456 | break; | |
258d091a | 1457 | #endif /* ENCRYPTION */ |
4a8a7128 | 1458 | |
ea139302 PB |
1459 | default: |
1460 | break; | |
1461 | } /* end of switch */ | |
1462 | ||
1463 | } /* end of suboption */ | |
1464 | ||
1af3d848 DB |
1465 | void |
1466 | doclientstat() | |
1467 | { | |
1468 | clientstat(TELOPT_LINEMODE, WILL, 0); | |
1469 | } | |
1470 | ||
ea139302 PB |
1471 | #define ADD(c) *ncp++ = c; |
1472 | #define ADD_DATA(c) { *ncp++ = c; if (c == SE) *ncp++ = c; } | |
1af3d848 | 1473 | void |
ea139302 PB |
1474 | send_status() |
1475 | { | |
4a8a7128 PB |
1476 | unsigned char statusbuf[256]; |
1477 | register unsigned char *ncp; | |
1478 | register unsigned char i; | |
ea139302 PB |
1479 | |
1480 | ncp = statusbuf; | |
1481 | ||
1482 | netflush(); /* get rid of anything waiting to go out */ | |
1483 | ||
1484 | ADD(IAC); | |
1485 | ADD(SB); | |
1486 | ADD(TELOPT_STATUS); | |
1487 | ADD(TELQUAL_IS); | |
1488 | ||
1af3d848 DB |
1489 | /* |
1490 | * We check the want_state rather than the current state, | |
1491 | * because if we received a DO/WILL for an option that we | |
1492 | * don't support, and the other side didn't send a DONT/WONT | |
1493 | * in response to our WONT/DONT, then the "state" will be | |
1494 | * WILL/DO, and the "want_state" will be WONT/DONT. We | |
1495 | * need to go by the latter. | |
1496 | */ | |
ea139302 | 1497 | for (i = 0; i < NTELOPTS; i++) { |
1af3d848 | 1498 | if (my_want_state_is_will(i)) { |
ea139302 PB |
1499 | ADD(WILL); |
1500 | ADD_DATA(i); | |
1501 | if (i == IAC) | |
1502 | ADD(IAC); | |
1503 | } | |
1af3d848 | 1504 | if (his_want_state_is_will(i)) { |
ea139302 PB |
1505 | ADD(DO); |
1506 | ADD_DATA(i); | |
1507 | if (i == IAC) | |
1508 | ADD(IAC); | |
1509 | } | |
1510 | } | |
1511 | ||
1af3d848 DB |
1512 | if (his_want_state_is_will(TELOPT_LFLOW)) { |
1513 | ADD(SB); | |
1514 | ADD(TELOPT_LFLOW); | |
8832c633 DB |
1515 | if (flowmode) { |
1516 | ADD(LFLOW_ON); | |
1517 | } else { | |
1518 | ADD(LFLOW_OFF); | |
1519 | } | |
1af3d848 | 1520 | ADD(SE); |
8832c633 DB |
1521 | |
1522 | if (restartany >= 0) { | |
1523 | ADD(SB) | |
1524 | ADD(TELOPT_LFLOW); | |
1525 | if (restartany) { | |
1526 | ADD(LFLOW_RESTART_ANY); | |
1527 | } else { | |
1528 | ADD(LFLOW_RESTART_XON); | |
1529 | } | |
1530 | ADD(SE) | |
1531 | ADD(SB); | |
1532 | } | |
1af3d848 DB |
1533 | } |
1534 | ||
ea139302 | 1535 | #ifdef LINEMODE |
1af3d848 | 1536 | if (his_want_state_is_will(TELOPT_LINEMODE)) { |
4a8a7128 | 1537 | unsigned char *cp, *cpe; |
ea139302 PB |
1538 | int len; |
1539 | ||
1540 | ADD(SB); | |
1541 | ADD(TELOPT_LINEMODE); | |
1542 | ADD(LM_MODE); | |
1543 | ADD_DATA(editmode); | |
1544 | if (editmode == IAC) | |
1545 | ADD(IAC); | |
1546 | ADD(SE); | |
1547 | ||
1548 | ADD(SB); | |
1549 | ADD(TELOPT_LINEMODE); | |
1550 | ADD(LM_SLC); | |
1551 | start_slc(0); | |
1552 | send_slc(); | |
1553 | len = end_slc(&cp); | |
1554 | for (cpe = cp + len; cp < cpe; cp++) | |
1555 | ADD_DATA(*cp); | |
1556 | ADD(SE); | |
1557 | } | |
1558 | #endif /* LINEMODE */ | |
1559 | ||
1560 | ADD(IAC); | |
1561 | ADD(SE); | |
1562 | ||
1563 | writenet(statusbuf, ncp - statusbuf); | |
1564 | netflush(); /* Send it on its way */ | |
4a8a7128 | 1565 | |
1af3d848 DB |
1566 | DIAG(TD_OPTIONS, |
1567 | {printsub('>', statusbuf, ncp - statusbuf); netflush();}); | |
1568 | } |