374330e2 |
1 | #include <windows.h> |
2 | #include <stdio.h> |
3 | #include <stdlib.h> |
374330e2 |
4 | |
5 | #include "putty.h" |
6 | |
7 | #ifndef FALSE |
8 | #define FALSE 0 |
9 | #endif |
10 | #ifndef TRUE |
11 | #define TRUE 1 |
12 | #endif |
13 | |
8df7a775 |
14 | static Socket s = NULL; |
374330e2 |
15 | |
16 | #define IAC 255 /* interpret as command: */ |
17 | #define DONT 254 /* you are not to use option */ |
18 | #define DO 253 /* please, you use option */ |
19 | #define WONT 252 /* I won't use option */ |
20 | #define WILL 251 /* I will use option */ |
21 | #define SB 250 /* interpret as subnegotiation */ |
22 | #define SE 240 /* end sub negotiation */ |
23 | |
24 | #define GA 249 /* you may reverse the line */ |
25 | #define EL 248 /* erase the current line */ |
26 | #define EC 247 /* erase the current character */ |
27 | #define AYT 246 /* are you there */ |
28 | #define AO 245 /* abort output--but let prog finish */ |
29 | #define IP 244 /* interrupt process--permanently */ |
30 | #define BREAK 243 /* break */ |
31 | #define DM 242 /* data mark--for connect. cleaning */ |
32 | #define NOP 241 /* nop */ |
33 | #define EOR 239 /* end of record (transparent mode) */ |
34 | #define ABORT 238 /* Abort process */ |
35 | #define SUSP 237 /* Suspend process */ |
36 | #define xEOF 236 /* End of file: EOF is already used... */ |
37 | |
38 | #define TELOPT_BINARY 0 /* 8-bit data path */ |
39 | #define TELOPT_ECHO 1 /* echo */ |
40 | #define TELOPT_RCP 2 /* prepare to reconnect */ |
41 | #define TELOPT_SGA 3 /* suppress go ahead */ |
42 | #define TELOPT_NAMS 4 /* approximate message size */ |
43 | #define TELOPT_STATUS 5 /* give status */ |
44 | #define TELOPT_TM 6 /* timing mark */ |
45 | #define TELOPT_RCTE 7 /* remote controlled transmission and echo */ |
46 | #define TELOPT_NAOL 8 /* negotiate about output line width */ |
47 | #define TELOPT_NAOP 9 /* negotiate about output page size */ |
48 | #define TELOPT_NAOCRD 10 /* negotiate about CR disposition */ |
49 | #define TELOPT_NAOHTS 11 /* negotiate about horizontal tabstops */ |
50 | #define TELOPT_NAOHTD 12 /* negotiate about horizontal tab disposition */ |
51 | #define TELOPT_NAOFFD 13 /* negotiate about formfeed disposition */ |
52 | #define TELOPT_NAOVTS 14 /* negotiate about vertical tab stops */ |
53 | #define TELOPT_NAOVTD 15 /* negotiate about vertical tab disposition */ |
54 | #define TELOPT_NAOLFD 16 /* negotiate about output LF disposition */ |
55 | #define TELOPT_XASCII 17 /* extended ascic character set */ |
56 | #define TELOPT_LOGOUT 18 /* force logout */ |
57 | #define TELOPT_BM 19 /* byte macro */ |
58 | #define TELOPT_DET 20 /* data entry terminal */ |
59 | #define TELOPT_SUPDUP 21 /* supdup protocol */ |
60 | #define TELOPT_SUPDUPOUTPUT 22 /* supdup output */ |
61 | #define TELOPT_SNDLOC 23 /* send location */ |
62 | #define TELOPT_TTYPE 24 /* terminal type */ |
63 | #define TELOPT_EOR 25 /* end or record */ |
64 | #define TELOPT_TUID 26 /* TACACS user identification */ |
65 | #define TELOPT_OUTMRK 27 /* output marking */ |
66 | #define TELOPT_TTYLOC 28 /* terminal location number */ |
67 | #define TELOPT_3270REGIME 29 /* 3270 regime */ |
68 | #define TELOPT_X3PAD 30 /* X.3 PAD */ |
69 | #define TELOPT_NAWS 31 /* window size */ |
70 | #define TELOPT_TSPEED 32 /* terminal speed */ |
71 | #define TELOPT_LFLOW 33 /* remote flow control */ |
72 | #define TELOPT_LINEMODE 34 /* Linemode option */ |
73 | #define TELOPT_XDISPLOC 35 /* X Display Location */ |
74 | #define TELOPT_OLD_ENVIRON 36 /* Old - Environment variables */ |
75 | #define TELOPT_AUTHENTICATION 37/* Authenticate */ |
76 | #define TELOPT_ENCRYPT 38 /* Encryption option */ |
77 | #define TELOPT_NEW_ENVIRON 39 /* New - Environment variables */ |
78 | #define TELOPT_EXOPL 255 /* extended-options-list */ |
79 | |
80 | #define TELQUAL_IS 0 /* option is... */ |
81 | #define TELQUAL_SEND 1 /* send option */ |
82 | #define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */ |
83 | #define BSD_VAR 1 |
84 | #define BSD_VALUE 0 |
85 | #define RFC_VAR 0 |
86 | #define RFC_VALUE 1 |
87 | |
88 | #define CR 13 |
89 | #define LF 10 |
90 | #define NUL 0 |
91 | |
92 | #define iswritable(x) ( (x) != IAC && (x) != CR ) |
93 | |
94 | static char *telopt(int opt) { |
95 | #define i(x) if (opt == TELOPT_ ## x) return #x; |
96 | i(BINARY); i(ECHO); i(RCP); i(SGA); i(NAMS); i(STATUS); i(TM); i(RCTE); |
97 | i(NAOL); i(NAOP); i(NAOCRD); i(NAOHTS); i(NAOHTD); i(NAOFFD); i(NAOVTS); |
98 | i(NAOVTD); i(NAOLFD); i(XASCII); i(LOGOUT); i(BM); i(DET); i(SUPDUP); |
99 | i(SUPDUPOUTPUT); i(SNDLOC); i(TTYPE); i(EOR); i(TUID); i(OUTMRK); |
100 | i(TTYLOC); i(X3PAD); i(NAWS); i(TSPEED); i(LFLOW); i(LINEMODE); |
101 | i(XDISPLOC); i(OLD_ENVIRON); i(AUTHENTICATION); i(ENCRYPT); |
102 | i(NEW_ENVIRON); i(EXOPL); |
103 | #undef i |
104 | return "<unknown>"; |
105 | } |
106 | |
107 | static void telnet_size(void); |
108 | |
109 | struct Opt { |
110 | int send; /* what we initially send */ |
111 | int nsend; /* -ve send if requested to stop it */ |
112 | int ack, nak; /* +ve and -ve acknowledgements */ |
113 | int option; /* the option code */ |
114 | enum { |
115 | REQUESTED, ACTIVE, INACTIVE, REALLY_INACTIVE |
116 | } state; |
117 | }; |
118 | |
119 | static struct Opt o_naws = {WILL, WONT, DO, DONT, TELOPT_NAWS, REQUESTED}; |
120 | static struct Opt o_tspeed = {WILL, WONT, DO, DONT, TELOPT_TSPEED, REQUESTED}; |
121 | static struct Opt o_ttype = {WILL, WONT, DO, DONT, TELOPT_TTYPE, REQUESTED}; |
122 | static struct Opt o_oenv = {WILL, WONT, DO, DONT, TELOPT_OLD_ENVIRON, |
123 | INACTIVE}; |
124 | static struct Opt o_nenv = {WILL, WONT, DO, DONT, TELOPT_NEW_ENVIRON, |
125 | REQUESTED}; |
126 | static struct Opt o_echo = {DO, DONT, WILL, WONT, TELOPT_ECHO, REQUESTED}; |
127 | static struct Opt o_we_sga = {WILL, WONT, DO, DONT, TELOPT_SGA, REQUESTED}; |
128 | static struct Opt o_they_sga = {DO, DONT, WILL, WONT, TELOPT_SGA, REQUESTED}; |
129 | |
130 | static struct Opt *opts[] = { |
131 | &o_naws, &o_tspeed, &o_ttype, &o_oenv, &o_nenv, &o_echo, |
132 | &o_we_sga, &o_they_sga, NULL |
133 | }; |
134 | |
374330e2 |
135 | static int in_synch; |
374330e2 |
136 | static int sb_opt, sb_len; |
137 | static char *sb_buf = NULL; |
138 | static int sb_size = 0; |
139 | #define SB_DELTA 1024 |
140 | |
fe50e814 |
141 | static void c_write1(int c) { |
142 | char cc = (char)c; |
143 | from_backend(0, &cc, 1); |
144 | } |
145 | |
374330e2 |
146 | static void log_option (char *sender, int cmd, int option) { |
147 | char buf[50]; |
148 | sprintf(buf, "%s:\t%s %s", sender, |
149 | (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" : |
150 | cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<??>"), |
151 | telopt(option)); |
c5e9c988 |
152 | logevent(buf); |
374330e2 |
153 | } |
154 | |
155 | static void send_opt (int cmd, int option) { |
156 | unsigned char b[3]; |
157 | |
158 | b[0] = IAC; b[1] = cmd; b[2] = option; |
8df7a775 |
159 | sk_write(s, b, 3); |
374330e2 |
160 | log_option("client", cmd, option); |
161 | } |
162 | |
163 | static void deactivate_option (struct Opt *o) { |
164 | if (o->state == REQUESTED || o->state == ACTIVE) |
165 | send_opt (o->nsend, o->option); |
166 | o->state = REALLY_INACTIVE; |
167 | } |
168 | |
708bbbbe |
169 | /* |
170 | * Generate side effects of enabling or disabling an option. |
171 | */ |
172 | static void option_side_effects(struct Opt *o, int enabled) { |
173 | if (o->option == TELOPT_ECHO && cfg.ldisc_term) |
174 | ldisc = enabled ? &ldisc_simple : &ldisc_term; |
175 | } |
176 | |
374330e2 |
177 | static void activate_option (struct Opt *o) { |
178 | if (o->send == WILL && o->option == TELOPT_NAWS) |
179 | telnet_size(); |
180 | if (o->send == WILL && |
181 | (o->option == TELOPT_NEW_ENVIRON || |
182 | o->option == TELOPT_OLD_ENVIRON)) { |
183 | /* |
184 | * We may only have one kind of ENVIRON going at a time. |
185 | * This is a hack, but who cares. |
186 | */ |
187 | deactivate_option (o->option==TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv); |
188 | } |
708bbbbe |
189 | option_side_effects(o, 1); |
374330e2 |
190 | } |
191 | |
192 | static void refused_option (struct Opt *o) { |
193 | if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON && |
194 | o_oenv.state == INACTIVE) { |
195 | send_opt (WILL, TELOPT_OLD_ENVIRON); |
196 | o_oenv.state = REQUESTED; |
197 | } |
708bbbbe |
198 | option_side_effects(o, 0); |
374330e2 |
199 | } |
200 | |
201 | static void proc_rec_opt (int cmd, int option) { |
202 | struct Opt **o; |
203 | |
204 | log_option ("server", cmd, option); |
205 | for (o = opts; *o; o++) { |
206 | if ((*o)->option == option && (*o)->ack == cmd) { |
207 | switch ((*o)->state) { |
208 | case REQUESTED: |
209 | (*o)->state = ACTIVE; |
210 | activate_option (*o); |
211 | break; |
212 | case ACTIVE: |
213 | break; |
214 | case INACTIVE: |
215 | (*o)->state = ACTIVE; |
216 | send_opt ((*o)->send, option); |
217 | activate_option (*o); |
218 | break; |
219 | case REALLY_INACTIVE: |
220 | send_opt ((*o)->nsend, option); |
221 | break; |
222 | } |
223 | return; |
224 | } else if ((*o)->option == option && (*o)->nak == cmd) { |
225 | switch ((*o)->state) { |
226 | case REQUESTED: |
227 | (*o)->state = INACTIVE; |
228 | refused_option (*o); |
229 | break; |
230 | case ACTIVE: |
231 | (*o)->state = INACTIVE; |
232 | send_opt ((*o)->nsend, option); |
708bbbbe |
233 | option_side_effects(*o, 0); |
374330e2 |
234 | break; |
235 | case INACTIVE: |
236 | case REALLY_INACTIVE: |
237 | break; |
238 | } |
239 | return; |
240 | } |
241 | } |
242 | /* |
243 | * If we reach here, the option was one we weren't prepared to |
244 | * cope with. So send a negative ack. |
245 | */ |
246 | send_opt ((cmd == WILL ? DONT : WONT), option); |
247 | } |
248 | |
249 | static void process_subneg (void) { |
250 | unsigned char b[2048], *p, *q; |
251 | int var, value, n; |
252 | char *e; |
253 | |
254 | switch (sb_opt) { |
255 | case TELOPT_TSPEED: |
256 | if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) { |
257 | char logbuf[sizeof(cfg.termspeed)+80]; |
258 | b[0] = IAC; b[1] = SB; b[2] = TELOPT_TSPEED; |
259 | b[3] = TELQUAL_IS; |
260 | strcpy(b+4, cfg.termspeed); |
261 | n = 4 + strlen(cfg.termspeed); |
262 | b[n] = IAC; b[n+1] = SE; |
8df7a775 |
263 | sk_write(s, b, n+2); |
c5e9c988 |
264 | logevent("server:\tSB TSPEED SEND"); |
374330e2 |
265 | sprintf(logbuf, "client:\tSB TSPEED IS %s", cfg.termspeed); |
c5e9c988 |
266 | logevent (logbuf); |
374330e2 |
267 | } else |
c5e9c988 |
268 | logevent ("server:\tSB TSPEED <something weird>"); |
374330e2 |
269 | break; |
270 | case TELOPT_TTYPE: |
271 | if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) { |
272 | char logbuf[sizeof(cfg.termtype)+80]; |
273 | b[0] = IAC; b[1] = SB; b[2] = TELOPT_TTYPE; |
274 | b[3] = TELQUAL_IS; |
275 | for (n = 0; cfg.termtype[n]; n++) |
276 | b[n+4] = (cfg.termtype[n] >= 'a' && cfg.termtype[n] <= 'z' ? |
277 | cfg.termtype[n] + 'A'-'a' : cfg.termtype[n]); |
278 | b[n+4] = IAC; b[n+5] = SE; |
8df7a775 |
279 | sk_write(s, b, n+6); |
374330e2 |
280 | b[n+4] = 0; |
c5e9c988 |
281 | logevent("server:\tSB TTYPE SEND"); |
374330e2 |
282 | sprintf(logbuf, "client:\tSB TTYPE IS %s", b+4); |
c5e9c988 |
283 | logevent(logbuf); |
374330e2 |
284 | } else |
c5e9c988 |
285 | logevent("server:\tSB TTYPE <something weird>\r\n"); |
374330e2 |
286 | break; |
287 | case TELOPT_OLD_ENVIRON: |
288 | case TELOPT_NEW_ENVIRON: |
289 | p = sb_buf; |
290 | q = p + sb_len; |
291 | if (p < q && *p == TELQUAL_SEND) { |
292 | char logbuf[50]; |
293 | p++; |
294 | sprintf (logbuf, "server:\tSB %s SEND", telopt(sb_opt)); |
c5e9c988 |
295 | logevent (logbuf); |
374330e2 |
296 | if (sb_opt == TELOPT_OLD_ENVIRON) { |
297 | if (cfg.rfc_environ) { |
298 | value = RFC_VALUE; |
299 | var = RFC_VAR; |
300 | } else { |
301 | value = BSD_VALUE; |
302 | var = BSD_VAR; |
303 | } |
304 | /* |
305 | * Try to guess the sense of VAR and VALUE. |
306 | */ |
307 | while (p < q) { |
308 | if (*p == RFC_VAR) { |
309 | value = RFC_VALUE; |
310 | var = RFC_VAR; |
311 | } else if (*p == BSD_VAR) { |
312 | value = BSD_VALUE; |
313 | var = BSD_VAR; |
314 | } |
315 | p++; |
316 | } |
317 | } else { |
318 | /* |
319 | * With NEW_ENVIRON, the sense of VAR and VALUE |
320 | * isn't in doubt. |
321 | */ |
322 | value = RFC_VALUE; |
323 | var = RFC_VAR; |
324 | } |
325 | b[0] = IAC; b[1] = SB; b[2] = sb_opt; |
326 | b[3] = TELQUAL_IS; |
327 | n = 4; |
37508af4 |
328 | e = cfg.environmt; |
374330e2 |
329 | while (*e) { |
330 | b[n++] = var; |
331 | while (*e && *e != '\t') b[n++] = *e++; |
332 | if (*e == '\t') e++; |
333 | b[n++] = value; |
334 | while (*e) b[n++] = *e++; |
335 | e++; |
336 | } |
337 | if (*cfg.username) { |
338 | b[n++] = var; b[n++] = 'U'; b[n++] = 'S'; |
339 | b[n++] = 'E'; b[n++] = 'R'; b[n++] = value; |
340 | e = cfg.username; |
341 | while (*e) b[n++] = *e++; |
342 | } |
343 | b[n++] = IAC; b[n++] = SE; |
8df7a775 |
344 | sk_write(s, b, n); |
374330e2 |
345 | sprintf(logbuf, "client:\tSB %s IS %s", telopt(sb_opt), |
346 | n==6 ? "<nothing>" : "<stuff>"); |
c5e9c988 |
347 | logevent (logbuf); |
374330e2 |
348 | } |
349 | break; |
350 | } |
351 | } |
352 | |
353 | static enum { |
354 | TOPLEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT, |
355 | SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR |
356 | } telnet_state = TOPLEVEL; |
357 | |
358 | static void do_telnet_read (char *buf, int len) { |
374330e2 |
359 | |
360 | while (len--) { |
361 | int c = (unsigned char) *buf++; |
362 | |
363 | switch (telnet_state) { |
364 | case TOPLEVEL: |
365 | case SEENCR: |
366 | if (c == NUL && telnet_state == SEENCR) |
367 | telnet_state = TOPLEVEL; |
368 | else if (c == IAC) |
369 | telnet_state = SEENIAC; |
370 | else { |
374330e2 |
371 | if (!in_synch) |
c9def1b8 |
372 | c_write1(c); |
2f938b83 |
373 | |
374 | #if 1 |
375 | /* I can't get the F***ing winsock to insert the urgent IAC |
376 | * into the right position! Even with SO_OOBINLINE it gives |
377 | * it to recv too soon. And of course the DM byte (that |
378 | * arrives in the same packet!) appears several K later!! |
379 | * |
380 | * Oh well, we do get the DM in the right place so I'll |
381 | * just stop hiding on the next 0xf2 and hope for the best. |
382 | */ |
383 | else if (c == DM) in_synch = 0; |
384 | #endif |
374330e2 |
385 | if (c == CR) |
386 | telnet_state = SEENCR; |
387 | else |
388 | telnet_state = TOPLEVEL; |
389 | } |
390 | break; |
391 | case SEENIAC: |
392 | if (c == DO) telnet_state = SEENDO; |
393 | else if (c == DONT) telnet_state = SEENDONT; |
394 | else if (c == WILL) telnet_state = SEENWILL; |
395 | else if (c == WONT) telnet_state = SEENWONT; |
396 | else if (c == SB) telnet_state = SEENSB; |
2f938b83 |
397 | else if (c == DM) { |
398 | in_synch = 0; |
399 | telnet_state = TOPLEVEL; |
400 | } |
300d41b0 |
401 | else { |
ded38628 |
402 | /* ignore everything else; print it if it's IAC */ |
403 | if (c == IAC) { |
c9def1b8 |
404 | c_write1(c); |
ded38628 |
405 | } |
300d41b0 |
406 | telnet_state = TOPLEVEL; |
407 | } |
374330e2 |
408 | break; |
409 | case SEENWILL: |
410 | proc_rec_opt (WILL, c); |
411 | telnet_state = TOPLEVEL; |
412 | break; |
413 | case SEENWONT: |
414 | proc_rec_opt (WONT, c); |
415 | telnet_state = TOPLEVEL; |
416 | break; |
417 | case SEENDO: |
418 | proc_rec_opt (DO, c); |
419 | telnet_state = TOPLEVEL; |
420 | break; |
421 | case SEENDONT: |
422 | proc_rec_opt (DONT, c); |
423 | telnet_state = TOPLEVEL; |
424 | break; |
425 | case SEENSB: |
426 | sb_opt = c; |
427 | sb_len = 0; |
428 | telnet_state = SUBNEGOT; |
429 | break; |
430 | case SUBNEGOT: |
431 | if (c == IAC) |
432 | telnet_state = SUBNEG_IAC; |
433 | else { |
434 | subneg_addchar: |
435 | if (sb_len >= sb_size) { |
436 | char *newbuf; |
437 | sb_size += SB_DELTA; |
438 | newbuf = (sb_buf ? |
c9def1b8 |
439 | srealloc(sb_buf, sb_size) : |
440 | smalloc(sb_size)); |
374330e2 |
441 | if (newbuf) |
442 | sb_buf = newbuf; |
443 | else |
444 | sb_size -= SB_DELTA; |
445 | } |
446 | if (sb_len < sb_size) |
447 | sb_buf[sb_len++] = c; |
448 | telnet_state = SUBNEGOT;/* in case we came here by goto */ |
449 | } |
450 | break; |
451 | case SUBNEG_IAC: |
452 | if (c != SE) |
453 | goto subneg_addchar; /* yes, it's a hack, I know, but... */ |
454 | else { |
455 | process_subneg(); |
456 | telnet_state = TOPLEVEL; |
457 | } |
458 | break; |
459 | } |
460 | } |
461 | } |
462 | |
8df7a775 |
463 | static int telnet_receive(Socket s, int urgent, char *data, int len) { |
464 | if (!len) { |
465 | /* Connection has closed. */ |
466 | sk_close(s); |
467 | s = NULL; |
468 | return 0; |
469 | } |
470 | do_telnet_read (data, len); |
471 | return 1; |
472 | } |
473 | |
374330e2 |
474 | /* |
8df7a775 |
475 | * Called to set up the Telnet connection. |
374330e2 |
476 | * |
477 | * Returns an error message, or NULL on success. |
478 | * |
479 | * Also places the canonical host name into `realhost'. |
480 | */ |
8df7a775 |
481 | static char *telnet_init (char *host, int port, char **realhost) { |
482 | SockAddr addr; |
483 | char *err; |
374330e2 |
484 | |
485 | /* |
486 | * Try to find host. |
487 | */ |
8df7a775 |
488 | addr = sk_namelookup(host, realhost); |
489 | if ( (err = sk_addr_error(addr)) ) |
490 | return err; |
374330e2 |
491 | |
492 | if (port < 0) |
493 | port = 23; /* default telnet port */ |
494 | |
495 | /* |
496 | * Open socket. |
497 | */ |
c91409da |
498 | s = sk_new(addr, port, 0, telnet_receive); |
8df7a775 |
499 | if ( (err = sk_socket_error(s)) ) |
500 | return err; |
374330e2 |
501 | |
8df7a775 |
502 | sk_addr_free(addr); |
374330e2 |
503 | |
504 | /* |
505 | * Initialise option states. |
506 | */ |
eb5e1db9 |
507 | if( cfg.ldisc_term ) |
508 | { |
509 | struct Opt **o; |
510 | |
511 | for (o = opts; *o; o++) |
512 | if ((*o)->state == REQUESTED) |
513 | (*o)->state = INACTIVE; |
514 | } |
515 | else |
374330e2 |
516 | { |
517 | struct Opt **o; |
518 | |
519 | for (o = opts; *o; o++) |
520 | if ((*o)->state == REQUESTED) |
521 | send_opt ((*o)->send, (*o)->option); |
522 | } |
523 | |
374330e2 |
524 | /* |
525 | * Set up SYNCH state. |
526 | */ |
527 | in_synch = FALSE; |
6f34e365 |
528 | |
529 | /* |
530 | * We have no pre-session phase. |
531 | */ |
532 | begin_session(); |
533 | |
374330e2 |
534 | return NULL; |
535 | } |
536 | |
537 | /* |
374330e2 |
538 | * Called to send data down the Telnet connection. |
539 | */ |
540 | static void telnet_send (char *buf, int len) { |
541 | char *p; |
542 | static unsigned char iac[2] = { IAC, IAC }; |
543 | static unsigned char cr[2] = { CR, NUL }; |
eb5e1db9 |
544 | static unsigned char nl[2] = { CR, LF }; |
374330e2 |
545 | |
8df7a775 |
546 | if (s == NULL) |
374330e2 |
547 | return; |
548 | |
549 | p = buf; |
2f938b83 |
550 | while (p < buf+len) { |
374330e2 |
551 | char *q = p; |
552 | |
553 | while (iswritable((unsigned char)*p) && p < buf+len) p++; |
8df7a775 |
554 | sk_write(s, q, p-q); |
374330e2 |
555 | |
556 | while (p < buf+len && !iswritable((unsigned char)*p)) { |
8df7a775 |
557 | sk_write(s, (unsigned char)*p == IAC ? iac : nl, 2); |
374330e2 |
558 | p++; |
559 | } |
560 | } |
561 | } |
562 | |
563 | /* |
564 | * Called to set the size of the window from Telnet's POV. |
565 | */ |
566 | static void telnet_size(void) { |
567 | unsigned char b[16]; |
568 | char logbuf[50]; |
569 | |
8df7a775 |
570 | if (s == NULL || o_naws.state != ACTIVE) |
374330e2 |
571 | return; |
572 | b[0] = IAC; b[1] = SB; b[2] = TELOPT_NAWS; |
573 | b[3] = cols >> 8; b[4] = cols & 0xFF; |
574 | b[5] = rows >> 8; b[6] = rows & 0xFF; |
575 | b[7] = IAC; b[8] = SE; |
8df7a775 |
576 | sk_write(s, b, 9); |
374330e2 |
577 | sprintf(logbuf, "client:\tSB NAWS %d,%d", |
578 | ((unsigned char)b[3] << 8) + (unsigned char)b[4], |
579 | ((unsigned char)b[5] << 8) + (unsigned char)b[6]); |
c5e9c988 |
580 | logevent (logbuf); |
374330e2 |
581 | } |
582 | |
583 | /* |
584 | * Send Telnet special codes. |
585 | */ |
586 | static void telnet_special (Telnet_Special code) { |
587 | unsigned char b[2]; |
588 | |
8df7a775 |
589 | if (s == NULL) |
374330e2 |
590 | return; |
591 | |
592 | b[0] = IAC; |
593 | switch (code) { |
8df7a775 |
594 | case TS_AYT: b[1] = AYT; sk_write(s, b, 2); break; |
595 | case TS_BRK: b[1] = BREAK; sk_write(s, b, 2); break; |
596 | case TS_EC: b[1] = EC; sk_write(s, b, 2); break; |
597 | case TS_EL: b[1] = EL; sk_write(s, b, 2); break; |
598 | case TS_GA: b[1] = GA; sk_write(s, b, 2); break; |
599 | case TS_NOP: b[1] = NOP; sk_write(s, b, 2); break; |
600 | case TS_ABORT: b[1] = ABORT; sk_write(s, b, 2); break; |
601 | case TS_AO: b[1] = AO; sk_write(s, b, 2); break; |
602 | case TS_IP: b[1] = IP; sk_write(s, b, 2); break; |
603 | case TS_SUSP: b[1] = SUSP; sk_write(s, b, 2); break; |
604 | case TS_EOR: b[1] = EOR; sk_write(s, b, 2); break; |
605 | case TS_EOF: b[1] = xEOF; sk_write(s, b, 2); break; |
374330e2 |
606 | case TS_SYNCH: |
8df7a775 |
607 | b[1] = DM; |
608 | sk_write (s, b, 1); |
609 | sk_write_oob (s, b+1, 1); |
610 | break; |
684d367c |
611 | case TS_RECHO: |
612 | if (o_echo.state == INACTIVE || o_echo.state == REALLY_INACTIVE) { |
613 | o_echo.state = REQUESTED; |
614 | send_opt (o_echo.send, o_echo.option); |
615 | } |
616 | break; |
617 | case TS_LECHO: |
618 | if (o_echo.state == ACTIVE) { |
619 | o_echo.state = REQUESTED; |
620 | send_opt (o_echo.nsend, o_echo.option); |
621 | } |
374330e2 |
622 | break; |
ec55b220 |
623 | case TS_PING: |
624 | if (o_they_sga.state == ACTIVE) { |
625 | b[1] = NOP; |
8df7a775 |
626 | sk_write(s, b, 2); |
ec55b220 |
627 | } |
628 | break; |
374330e2 |
629 | } |
630 | } |
631 | |
8df7a775 |
632 | static Socket telnet_socket(void) { return s; } |
8ccc75b0 |
633 | |
634 | static int telnet_sendok(void) { return 1; } |
4017be6d |
635 | |
374330e2 |
636 | Backend telnet_backend = { |
637 | telnet_init, |
374330e2 |
638 | telnet_send, |
639 | telnet_size, |
4017be6d |
640 | telnet_special, |
8ccc75b0 |
641 | telnet_socket, |
97db3be4 |
642 | telnet_sendok, |
643 | 23 |
374330e2 |
644 | }; |