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 | |
0965bee0 |
135 | static int echoing = TRUE, editing = TRUE; |
136 | |
374330e2 |
137 | static int in_synch; |
374330e2 |
138 | static int sb_opt, sb_len; |
139 | static char *sb_buf = NULL; |
140 | static int sb_size = 0; |
141 | #define SB_DELTA 1024 |
142 | |
fe50e814 |
143 | static void c_write1(int c) { |
144 | char cc = (char)c; |
145 | from_backend(0, &cc, 1); |
146 | } |
147 | |
374330e2 |
148 | static void log_option (char *sender, int cmd, int option) { |
149 | char buf[50]; |
150 | sprintf(buf, "%s:\t%s %s", sender, |
151 | (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" : |
152 | cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<??>"), |
153 | telopt(option)); |
c5e9c988 |
154 | logevent(buf); |
374330e2 |
155 | } |
156 | |
157 | static void send_opt (int cmd, int option) { |
158 | unsigned char b[3]; |
159 | |
160 | b[0] = IAC; b[1] = cmd; b[2] = option; |
8df7a775 |
161 | sk_write(s, b, 3); |
374330e2 |
162 | log_option("client", cmd, option); |
163 | } |
164 | |
165 | static void deactivate_option (struct Opt *o) { |
166 | if (o->state == REQUESTED || o->state == ACTIVE) |
167 | send_opt (o->nsend, o->option); |
168 | o->state = REALLY_INACTIVE; |
169 | } |
170 | |
708bbbbe |
171 | /* |
172 | * Generate side effects of enabling or disabling an option. |
173 | */ |
174 | static void option_side_effects(struct Opt *o, int enabled) { |
0965bee0 |
175 | if (o->option == TELOPT_ECHO && o->send == DO) |
176 | echoing = !enabled; |
177 | else if (o->option = TELOPT_SGA && o->send == DO) |
178 | editing = !enabled; |
179 | ldisc_send(NULL, 0); /* cause ldisc to notice the change */ |
708bbbbe |
180 | } |
181 | |
374330e2 |
182 | static void activate_option (struct Opt *o) { |
183 | if (o->send == WILL && o->option == TELOPT_NAWS) |
184 | telnet_size(); |
185 | if (o->send == WILL && |
186 | (o->option == TELOPT_NEW_ENVIRON || |
187 | o->option == TELOPT_OLD_ENVIRON)) { |
188 | /* |
189 | * We may only have one kind of ENVIRON going at a time. |
190 | * This is a hack, but who cares. |
191 | */ |
192 | deactivate_option (o->option==TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv); |
193 | } |
708bbbbe |
194 | option_side_effects(o, 1); |
374330e2 |
195 | } |
196 | |
197 | static void refused_option (struct Opt *o) { |
198 | if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON && |
199 | o_oenv.state == INACTIVE) { |
200 | send_opt (WILL, TELOPT_OLD_ENVIRON); |
201 | o_oenv.state = REQUESTED; |
202 | } |
708bbbbe |
203 | option_side_effects(o, 0); |
374330e2 |
204 | } |
205 | |
206 | static void proc_rec_opt (int cmd, int option) { |
207 | struct Opt **o; |
208 | |
209 | log_option ("server", cmd, option); |
210 | for (o = opts; *o; o++) { |
211 | if ((*o)->option == option && (*o)->ack == cmd) { |
212 | switch ((*o)->state) { |
213 | case REQUESTED: |
214 | (*o)->state = ACTIVE; |
215 | activate_option (*o); |
216 | break; |
217 | case ACTIVE: |
218 | break; |
219 | case INACTIVE: |
220 | (*o)->state = ACTIVE; |
221 | send_opt ((*o)->send, option); |
222 | activate_option (*o); |
223 | break; |
224 | case REALLY_INACTIVE: |
225 | send_opt ((*o)->nsend, option); |
226 | break; |
227 | } |
228 | return; |
229 | } else if ((*o)->option == option && (*o)->nak == cmd) { |
230 | switch ((*o)->state) { |
231 | case REQUESTED: |
232 | (*o)->state = INACTIVE; |
233 | refused_option (*o); |
234 | break; |
235 | case ACTIVE: |
236 | (*o)->state = INACTIVE; |
237 | send_opt ((*o)->nsend, option); |
708bbbbe |
238 | option_side_effects(*o, 0); |
374330e2 |
239 | break; |
240 | case INACTIVE: |
241 | case REALLY_INACTIVE: |
242 | break; |
243 | } |
244 | return; |
245 | } |
246 | } |
247 | /* |
248 | * If we reach here, the option was one we weren't prepared to |
249 | * cope with. So send a negative ack. |
250 | */ |
251 | send_opt ((cmd == WILL ? DONT : WONT), option); |
252 | } |
253 | |
254 | static void process_subneg (void) { |
255 | unsigned char b[2048], *p, *q; |
256 | int var, value, n; |
257 | char *e; |
258 | |
259 | switch (sb_opt) { |
260 | case TELOPT_TSPEED: |
261 | if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) { |
262 | char logbuf[sizeof(cfg.termspeed)+80]; |
263 | b[0] = IAC; b[1] = SB; b[2] = TELOPT_TSPEED; |
264 | b[3] = TELQUAL_IS; |
265 | strcpy(b+4, cfg.termspeed); |
266 | n = 4 + strlen(cfg.termspeed); |
267 | b[n] = IAC; b[n+1] = SE; |
8df7a775 |
268 | sk_write(s, b, n+2); |
c5e9c988 |
269 | logevent("server:\tSB TSPEED SEND"); |
374330e2 |
270 | sprintf(logbuf, "client:\tSB TSPEED IS %s", cfg.termspeed); |
c5e9c988 |
271 | logevent (logbuf); |
374330e2 |
272 | } else |
c5e9c988 |
273 | logevent ("server:\tSB TSPEED <something weird>"); |
374330e2 |
274 | break; |
275 | case TELOPT_TTYPE: |
276 | if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) { |
277 | char logbuf[sizeof(cfg.termtype)+80]; |
278 | b[0] = IAC; b[1] = SB; b[2] = TELOPT_TTYPE; |
279 | b[3] = TELQUAL_IS; |
280 | for (n = 0; cfg.termtype[n]; n++) |
281 | b[n+4] = (cfg.termtype[n] >= 'a' && cfg.termtype[n] <= 'z' ? |
282 | cfg.termtype[n] + 'A'-'a' : cfg.termtype[n]); |
283 | b[n+4] = IAC; b[n+5] = SE; |
8df7a775 |
284 | sk_write(s, b, n+6); |
374330e2 |
285 | b[n+4] = 0; |
c5e9c988 |
286 | logevent("server:\tSB TTYPE SEND"); |
374330e2 |
287 | sprintf(logbuf, "client:\tSB TTYPE IS %s", b+4); |
c5e9c988 |
288 | logevent(logbuf); |
374330e2 |
289 | } else |
c5e9c988 |
290 | logevent("server:\tSB TTYPE <something weird>\r\n"); |
374330e2 |
291 | break; |
292 | case TELOPT_OLD_ENVIRON: |
293 | case TELOPT_NEW_ENVIRON: |
294 | p = sb_buf; |
295 | q = p + sb_len; |
296 | if (p < q && *p == TELQUAL_SEND) { |
297 | char logbuf[50]; |
298 | p++; |
299 | sprintf (logbuf, "server:\tSB %s SEND", telopt(sb_opt)); |
c5e9c988 |
300 | logevent (logbuf); |
374330e2 |
301 | if (sb_opt == TELOPT_OLD_ENVIRON) { |
302 | if (cfg.rfc_environ) { |
303 | value = RFC_VALUE; |
304 | var = RFC_VAR; |
305 | } else { |
306 | value = BSD_VALUE; |
307 | var = BSD_VAR; |
308 | } |
309 | /* |
310 | * Try to guess the sense of VAR and VALUE. |
311 | */ |
312 | while (p < q) { |
313 | if (*p == RFC_VAR) { |
314 | value = RFC_VALUE; |
315 | var = RFC_VAR; |
316 | } else if (*p == BSD_VAR) { |
317 | value = BSD_VALUE; |
318 | var = BSD_VAR; |
319 | } |
320 | p++; |
321 | } |
322 | } else { |
323 | /* |
324 | * With NEW_ENVIRON, the sense of VAR and VALUE |
325 | * isn't in doubt. |
326 | */ |
327 | value = RFC_VALUE; |
328 | var = RFC_VAR; |
329 | } |
330 | b[0] = IAC; b[1] = SB; b[2] = sb_opt; |
331 | b[3] = TELQUAL_IS; |
332 | n = 4; |
37508af4 |
333 | e = cfg.environmt; |
374330e2 |
334 | while (*e) { |
335 | b[n++] = var; |
336 | while (*e && *e != '\t') b[n++] = *e++; |
337 | if (*e == '\t') e++; |
338 | b[n++] = value; |
339 | while (*e) b[n++] = *e++; |
340 | e++; |
341 | } |
342 | if (*cfg.username) { |
343 | b[n++] = var; b[n++] = 'U'; b[n++] = 'S'; |
344 | b[n++] = 'E'; b[n++] = 'R'; b[n++] = value; |
345 | e = cfg.username; |
346 | while (*e) b[n++] = *e++; |
347 | } |
348 | b[n++] = IAC; b[n++] = SE; |
8df7a775 |
349 | sk_write(s, b, n); |
374330e2 |
350 | sprintf(logbuf, "client:\tSB %s IS %s", telopt(sb_opt), |
351 | n==6 ? "<nothing>" : "<stuff>"); |
c5e9c988 |
352 | logevent (logbuf); |
374330e2 |
353 | } |
354 | break; |
355 | } |
356 | } |
357 | |
358 | static enum { |
359 | TOPLEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT, |
360 | SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR |
361 | } telnet_state = TOPLEVEL; |
362 | |
363 | static void do_telnet_read (char *buf, int len) { |
374330e2 |
364 | |
365 | while (len--) { |
366 | int c = (unsigned char) *buf++; |
367 | |
368 | switch (telnet_state) { |
369 | case TOPLEVEL: |
370 | case SEENCR: |
371 | if (c == NUL && telnet_state == SEENCR) |
372 | telnet_state = TOPLEVEL; |
373 | else if (c == IAC) |
374 | telnet_state = SEENIAC; |
375 | else { |
374330e2 |
376 | if (!in_synch) |
c9def1b8 |
377 | c_write1(c); |
2f938b83 |
378 | |
379 | #if 1 |
380 | /* I can't get the F***ing winsock to insert the urgent IAC |
381 | * into the right position! Even with SO_OOBINLINE it gives |
382 | * it to recv too soon. And of course the DM byte (that |
383 | * arrives in the same packet!) appears several K later!! |
384 | * |
385 | * Oh well, we do get the DM in the right place so I'll |
386 | * just stop hiding on the next 0xf2 and hope for the best. |
387 | */ |
388 | else if (c == DM) in_synch = 0; |
389 | #endif |
374330e2 |
390 | if (c == CR) |
391 | telnet_state = SEENCR; |
392 | else |
393 | telnet_state = TOPLEVEL; |
394 | } |
395 | break; |
396 | case SEENIAC: |
397 | if (c == DO) telnet_state = SEENDO; |
398 | else if (c == DONT) telnet_state = SEENDONT; |
399 | else if (c == WILL) telnet_state = SEENWILL; |
400 | else if (c == WONT) telnet_state = SEENWONT; |
401 | else if (c == SB) telnet_state = SEENSB; |
2f938b83 |
402 | else if (c == DM) { |
403 | in_synch = 0; |
404 | telnet_state = TOPLEVEL; |
405 | } |
300d41b0 |
406 | else { |
ded38628 |
407 | /* ignore everything else; print it if it's IAC */ |
408 | if (c == IAC) { |
c9def1b8 |
409 | c_write1(c); |
ded38628 |
410 | } |
300d41b0 |
411 | telnet_state = TOPLEVEL; |
412 | } |
374330e2 |
413 | break; |
414 | case SEENWILL: |
415 | proc_rec_opt (WILL, c); |
416 | telnet_state = TOPLEVEL; |
417 | break; |
418 | case SEENWONT: |
419 | proc_rec_opt (WONT, c); |
420 | telnet_state = TOPLEVEL; |
421 | break; |
422 | case SEENDO: |
423 | proc_rec_opt (DO, c); |
424 | telnet_state = TOPLEVEL; |
425 | break; |
426 | case SEENDONT: |
427 | proc_rec_opt (DONT, c); |
428 | telnet_state = TOPLEVEL; |
429 | break; |
430 | case SEENSB: |
431 | sb_opt = c; |
432 | sb_len = 0; |
433 | telnet_state = SUBNEGOT; |
434 | break; |
435 | case SUBNEGOT: |
436 | if (c == IAC) |
437 | telnet_state = SUBNEG_IAC; |
438 | else { |
439 | subneg_addchar: |
440 | if (sb_len >= sb_size) { |
441 | char *newbuf; |
442 | sb_size += SB_DELTA; |
443 | newbuf = (sb_buf ? |
c9def1b8 |
444 | srealloc(sb_buf, sb_size) : |
445 | smalloc(sb_size)); |
374330e2 |
446 | if (newbuf) |
447 | sb_buf = newbuf; |
448 | else |
449 | sb_size -= SB_DELTA; |
450 | } |
451 | if (sb_len < sb_size) |
452 | sb_buf[sb_len++] = c; |
453 | telnet_state = SUBNEGOT;/* in case we came here by goto */ |
454 | } |
455 | break; |
456 | case SUBNEG_IAC: |
457 | if (c != SE) |
458 | goto subneg_addchar; /* yes, it's a hack, I know, but... */ |
459 | else { |
460 | process_subneg(); |
461 | telnet_state = TOPLEVEL; |
462 | } |
463 | break; |
464 | } |
465 | } |
466 | } |
467 | |
7dbb9f56 |
468 | static int telnet_receive(Socket skt, int urgent, char *data, int len) { |
2c94fd1c |
469 | if (urgent==3) { |
470 | /* A socket error has occurred. */ |
b47b2198 |
471 | sk_close(s); |
7dbb9f56 |
472 | s = NULL; |
2c94fd1c |
473 | connection_fatal(data); |
b47b2198 |
474 | return 0; |
475 | } else if (!len) { |
8df7a775 |
476 | /* Connection has closed. */ |
477 | sk_close(s); |
478 | s = NULL; |
479 | return 0; |
480 | } |
1ad4eb6f |
481 | if(urgent) in_synch = TRUE; |
8df7a775 |
482 | do_telnet_read (data, len); |
483 | return 1; |
484 | } |
485 | |
374330e2 |
486 | /* |
8df7a775 |
487 | * Called to set up the Telnet connection. |
374330e2 |
488 | * |
489 | * Returns an error message, or NULL on success. |
490 | * |
491 | * Also places the canonical host name into `realhost'. |
492 | */ |
8df7a775 |
493 | static char *telnet_init (char *host, int port, char **realhost) { |
494 | SockAddr addr; |
495 | char *err; |
374330e2 |
496 | |
497 | /* |
498 | * Try to find host. |
499 | */ |
8df7a775 |
500 | addr = sk_namelookup(host, realhost); |
501 | if ( (err = sk_addr_error(addr)) ) |
502 | return err; |
374330e2 |
503 | |
504 | if (port < 0) |
505 | port = 23; /* default telnet port */ |
506 | |
507 | /* |
508 | * Open socket. |
509 | */ |
c91409da |
510 | s = sk_new(addr, port, 0, telnet_receive); |
8df7a775 |
511 | if ( (err = sk_socket_error(s)) ) |
512 | return err; |
374330e2 |
513 | |
8df7a775 |
514 | sk_addr_free(addr); |
374330e2 |
515 | |
516 | /* |
517 | * Initialise option states. |
518 | */ |
519 | { |
520 | struct Opt **o; |
521 | |
522 | for (o = opts; *o; o++) |
523 | if ((*o)->state == REQUESTED) |
524 | send_opt ((*o)->send, (*o)->option); |
525 | } |
526 | |
374330e2 |
527 | /* |
528 | * Set up SYNCH state. |
529 | */ |
530 | in_synch = FALSE; |
6f34e365 |
531 | |
374330e2 |
532 | return NULL; |
533 | } |
534 | |
535 | /* |
374330e2 |
536 | * Called to send data down the Telnet connection. |
537 | */ |
538 | static void telnet_send (char *buf, int len) { |
539 | char *p; |
540 | static unsigned char iac[2] = { IAC, IAC }; |
541 | static unsigned char cr[2] = { CR, NUL }; |
eb5e1db9 |
542 | static unsigned char nl[2] = { CR, LF }; |
374330e2 |
543 | |
8df7a775 |
544 | if (s == NULL) |
374330e2 |
545 | return; |
546 | |
547 | p = buf; |
2f938b83 |
548 | while (p < buf+len) { |
374330e2 |
549 | char *q = p; |
550 | |
551 | while (iswritable((unsigned char)*p) && p < buf+len) p++; |
8df7a775 |
552 | sk_write(s, q, p-q); |
374330e2 |
553 | |
554 | while (p < buf+len && !iswritable((unsigned char)*p)) { |
8df7a775 |
555 | sk_write(s, (unsigned char)*p == IAC ? iac : nl, 2); |
374330e2 |
556 | p++; |
557 | } |
558 | } |
559 | } |
560 | |
561 | /* |
562 | * Called to set the size of the window from Telnet's POV. |
563 | */ |
564 | static void telnet_size(void) { |
565 | unsigned char b[16]; |
566 | char logbuf[50]; |
567 | |
8df7a775 |
568 | if (s == NULL || o_naws.state != ACTIVE) |
374330e2 |
569 | return; |
570 | b[0] = IAC; b[1] = SB; b[2] = TELOPT_NAWS; |
571 | b[3] = cols >> 8; b[4] = cols & 0xFF; |
572 | b[5] = rows >> 8; b[6] = rows & 0xFF; |
573 | b[7] = IAC; b[8] = SE; |
8df7a775 |
574 | sk_write(s, b, 9); |
374330e2 |
575 | sprintf(logbuf, "client:\tSB NAWS %d,%d", |
576 | ((unsigned char)b[3] << 8) + (unsigned char)b[4], |
577 | ((unsigned char)b[5] << 8) + (unsigned char)b[6]); |
c5e9c988 |
578 | logevent (logbuf); |
374330e2 |
579 | } |
580 | |
581 | /* |
582 | * Send Telnet special codes. |
583 | */ |
584 | static void telnet_special (Telnet_Special code) { |
585 | unsigned char b[2]; |
586 | |
8df7a775 |
587 | if (s == NULL) |
374330e2 |
588 | return; |
589 | |
590 | b[0] = IAC; |
591 | switch (code) { |
8df7a775 |
592 | case TS_AYT: b[1] = AYT; sk_write(s, b, 2); break; |
593 | case TS_BRK: b[1] = BREAK; sk_write(s, b, 2); break; |
594 | case TS_EC: b[1] = EC; sk_write(s, b, 2); break; |
595 | case TS_EL: b[1] = EL; sk_write(s, b, 2); break; |
596 | case TS_GA: b[1] = GA; sk_write(s, b, 2); break; |
597 | case TS_NOP: b[1] = NOP; sk_write(s, b, 2); break; |
598 | case TS_ABORT: b[1] = ABORT; sk_write(s, b, 2); break; |
599 | case TS_AO: b[1] = AO; sk_write(s, b, 2); break; |
600 | case TS_IP: b[1] = IP; sk_write(s, b, 2); break; |
601 | case TS_SUSP: b[1] = SUSP; sk_write(s, b, 2); break; |
602 | case TS_EOR: b[1] = EOR; sk_write(s, b, 2); break; |
603 | case TS_EOF: b[1] = xEOF; sk_write(s, b, 2); break; |
374330e2 |
604 | case TS_SYNCH: |
8df7a775 |
605 | b[1] = DM; |
606 | sk_write (s, b, 1); |
607 | sk_write_oob (s, b+1, 1); |
608 | break; |
684d367c |
609 | case TS_RECHO: |
610 | if (o_echo.state == INACTIVE || o_echo.state == REALLY_INACTIVE) { |
611 | o_echo.state = REQUESTED; |
612 | send_opt (o_echo.send, o_echo.option); |
613 | } |
614 | break; |
615 | case TS_LECHO: |
616 | if (o_echo.state == ACTIVE) { |
617 | o_echo.state = REQUESTED; |
618 | send_opt (o_echo.nsend, o_echo.option); |
619 | } |
374330e2 |
620 | break; |
ec55b220 |
621 | case TS_PING: |
622 | if (o_they_sga.state == ACTIVE) { |
623 | b[1] = NOP; |
8df7a775 |
624 | sk_write(s, b, 2); |
ec55b220 |
625 | } |
626 | break; |
374330e2 |
627 | } |
628 | } |
629 | |
8df7a775 |
630 | static Socket telnet_socket(void) { return s; } |
8ccc75b0 |
631 | |
632 | static int telnet_sendok(void) { return 1; } |
4017be6d |
633 | |
0965bee0 |
634 | static int telnet_ldisc(int option) { |
635 | if (option == LD_ECHO) return echoing; |
636 | if (option == LD_EDIT) return editing; |
637 | return FALSE; |
638 | } |
639 | |
374330e2 |
640 | Backend telnet_backend = { |
641 | telnet_init, |
374330e2 |
642 | telnet_send, |
643 | telnet_size, |
4017be6d |
644 | telnet_special, |
8ccc75b0 |
645 | telnet_socket, |
97db3be4 |
646 | telnet_sendok, |
0965bee0 |
647 | telnet_ldisc, |
97db3be4 |
648 | 23 |
374330e2 |
649 | }; |