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RDB's patch: thanks to improvements in OEMANSI font mode, it can now
[u/mdw/putty] / telnet.c
CommitLineData
374330e2 1#include <windows.h>
2#include <stdio.h>
3#include <stdlib.h>
4#include <winsock.h>
5
6#include "putty.h"
7
8#ifndef FALSE
9#define FALSE 0
10#endif
11#ifndef TRUE
12#define TRUE 1
13#endif
14
15static SOCKET s = INVALID_SOCKET;
16
17#define IAC 255 /* interpret as command: */
18#define DONT 254 /* you are not to use option */
19#define DO 253 /* please, you use option */
20#define WONT 252 /* I won't use option */
21#define WILL 251 /* I will use option */
22#define SB 250 /* interpret as subnegotiation */
23#define SE 240 /* end sub negotiation */
24
25#define GA 249 /* you may reverse the line */
26#define EL 248 /* erase the current line */
27#define EC 247 /* erase the current character */
28#define AYT 246 /* are you there */
29#define AO 245 /* abort output--but let prog finish */
30#define IP 244 /* interrupt process--permanently */
31#define BREAK 243 /* break */
32#define DM 242 /* data mark--for connect. cleaning */
33#define NOP 241 /* nop */
34#define EOR 239 /* end of record (transparent mode) */
35#define ABORT 238 /* Abort process */
36#define SUSP 237 /* Suspend process */
37#define xEOF 236 /* End of file: EOF is already used... */
38
39#define TELOPT_BINARY 0 /* 8-bit data path */
40#define TELOPT_ECHO 1 /* echo */
41#define TELOPT_RCP 2 /* prepare to reconnect */
42#define TELOPT_SGA 3 /* suppress go ahead */
43#define TELOPT_NAMS 4 /* approximate message size */
44#define TELOPT_STATUS 5 /* give status */
45#define TELOPT_TM 6 /* timing mark */
46#define TELOPT_RCTE 7 /* remote controlled transmission and echo */
47#define TELOPT_NAOL 8 /* negotiate about output line width */
48#define TELOPT_NAOP 9 /* negotiate about output page size */
49#define TELOPT_NAOCRD 10 /* negotiate about CR disposition */
50#define TELOPT_NAOHTS 11 /* negotiate about horizontal tabstops */
51#define TELOPT_NAOHTD 12 /* negotiate about horizontal tab disposition */
52#define TELOPT_NAOFFD 13 /* negotiate about formfeed disposition */
53#define TELOPT_NAOVTS 14 /* negotiate about vertical tab stops */
54#define TELOPT_NAOVTD 15 /* negotiate about vertical tab disposition */
55#define TELOPT_NAOLFD 16 /* negotiate about output LF disposition */
56#define TELOPT_XASCII 17 /* extended ascic character set */
57#define TELOPT_LOGOUT 18 /* force logout */
58#define TELOPT_BM 19 /* byte macro */
59#define TELOPT_DET 20 /* data entry terminal */
60#define TELOPT_SUPDUP 21 /* supdup protocol */
61#define TELOPT_SUPDUPOUTPUT 22 /* supdup output */
62#define TELOPT_SNDLOC 23 /* send location */
63#define TELOPT_TTYPE 24 /* terminal type */
64#define TELOPT_EOR 25 /* end or record */
65#define TELOPT_TUID 26 /* TACACS user identification */
66#define TELOPT_OUTMRK 27 /* output marking */
67#define TELOPT_TTYLOC 28 /* terminal location number */
68#define TELOPT_3270REGIME 29 /* 3270 regime */
69#define TELOPT_X3PAD 30 /* X.3 PAD */
70#define TELOPT_NAWS 31 /* window size */
71#define TELOPT_TSPEED 32 /* terminal speed */
72#define TELOPT_LFLOW 33 /* remote flow control */
73#define TELOPT_LINEMODE 34 /* Linemode option */
74#define TELOPT_XDISPLOC 35 /* X Display Location */
75#define TELOPT_OLD_ENVIRON 36 /* Old - Environment variables */
76#define TELOPT_AUTHENTICATION 37/* Authenticate */
77#define TELOPT_ENCRYPT 38 /* Encryption option */
78#define TELOPT_NEW_ENVIRON 39 /* New - Environment variables */
79#define TELOPT_EXOPL 255 /* extended-options-list */
80
81#define TELQUAL_IS 0 /* option is... */
82#define TELQUAL_SEND 1 /* send option */
83#define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */
84#define BSD_VAR 1
85#define BSD_VALUE 0
86#define RFC_VAR 0
87#define RFC_VALUE 1
88
89#define CR 13
90#define LF 10
91#define NUL 0
92
93#define iswritable(x) ( (x) != IAC && (x) != CR )
94
95static char *telopt(int opt) {
96#define i(x) if (opt == TELOPT_ ## x) return #x;
97 i(BINARY); i(ECHO); i(RCP); i(SGA); i(NAMS); i(STATUS); i(TM); i(RCTE);
98 i(NAOL); i(NAOP); i(NAOCRD); i(NAOHTS); i(NAOHTD); i(NAOFFD); i(NAOVTS);
99 i(NAOVTD); i(NAOLFD); i(XASCII); i(LOGOUT); i(BM); i(DET); i(SUPDUP);
100 i(SUPDUPOUTPUT); i(SNDLOC); i(TTYPE); i(EOR); i(TUID); i(OUTMRK);
101 i(TTYLOC); i(X3PAD); i(NAWS); i(TSPEED); i(LFLOW); i(LINEMODE);
102 i(XDISPLOC); i(OLD_ENVIRON); i(AUTHENTICATION); i(ENCRYPT);
103 i(NEW_ENVIRON); i(EXOPL);
104#undef i
105 return "<unknown>";
106}
107
108static void telnet_size(void);
109
110struct Opt {
111 int send; /* what we initially send */
112 int nsend; /* -ve send if requested to stop it */
113 int ack, nak; /* +ve and -ve acknowledgements */
114 int option; /* the option code */
115 enum {
116 REQUESTED, ACTIVE, INACTIVE, REALLY_INACTIVE
117 } state;
118};
119
120static struct Opt o_naws = {WILL, WONT, DO, DONT, TELOPT_NAWS, REQUESTED};
121static struct Opt o_tspeed = {WILL, WONT, DO, DONT, TELOPT_TSPEED, REQUESTED};
122static struct Opt o_ttype = {WILL, WONT, DO, DONT, TELOPT_TTYPE, REQUESTED};
123static struct Opt o_oenv = {WILL, WONT, DO, DONT, TELOPT_OLD_ENVIRON,
124 INACTIVE};
125static struct Opt o_nenv = {WILL, WONT, DO, DONT, TELOPT_NEW_ENVIRON,
126 REQUESTED};
127static struct Opt o_echo = {DO, DONT, WILL, WONT, TELOPT_ECHO, REQUESTED};
128static struct Opt o_we_sga = {WILL, WONT, DO, DONT, TELOPT_SGA, REQUESTED};
129static struct Opt o_they_sga = {DO, DONT, WILL, WONT, TELOPT_SGA, REQUESTED};
130
131static struct Opt *opts[] = {
132 &o_naws, &o_tspeed, &o_ttype, &o_oenv, &o_nenv, &o_echo,
133 &o_we_sga, &o_they_sga, NULL
134};
135
136#if 0
137static int in_synch;
138#endif
139
140static int sb_opt, sb_len;
141static char *sb_buf = NULL;
142static int sb_size = 0;
143#define SB_DELTA 1024
144
145static void try_write (void) {
146 while (outbuf_head != outbuf_reap) {
147 int end = (outbuf_reap < outbuf_head ? outbuf_head : OUTBUF_SIZE);
148 int len = end - outbuf_reap;
149 int ret;
150
151 ret = send (s, outbuf+outbuf_reap, len, 0);
152 if (ret > 0)
153 outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK;
154 if (ret < len)
155 return;
156 }
157}
158
159static void s_write (void *buf, int len) {
160 unsigned char *p = buf;
161 while (len--) {
162 int new_head = (outbuf_head + 1) & OUTBUF_MASK;
163 if (new_head != outbuf_reap) {
164 outbuf[outbuf_head] = *p++;
165 outbuf_head = new_head;
166 }
167 }
168 try_write();
169}
170
171static void c_write (char *buf, int len) {
172 while (len--) {
173 int new_head = (inbuf_head + 1) & INBUF_MASK;
374330e2 174 if (new_head != inbuf_reap) {
175 inbuf[inbuf_head] = *buf++;
176 inbuf_head = new_head;
cabfd08c 177 } else {
178 term_out();
179 if( inbuf_head == inbuf_reap ) len++; else break;
374330e2 180 }
181 }
182}
183
184static void log_option (char *sender, int cmd, int option) {
185 char buf[50];
186 sprintf(buf, "%s:\t%s %s", sender,
187 (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" :
188 cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<??>"),
189 telopt(option));
c5e9c988 190 logevent(buf);
374330e2 191}
192
193static void send_opt (int cmd, int option) {
194 unsigned char b[3];
195
196 b[0] = IAC; b[1] = cmd; b[2] = option;
197 s_write (b, 3);
198 log_option("client", cmd, option);
199}
200
201static void deactivate_option (struct Opt *o) {
202 if (o->state == REQUESTED || o->state == ACTIVE)
203 send_opt (o->nsend, o->option);
204 o->state = REALLY_INACTIVE;
205}
206
207static void activate_option (struct Opt *o) {
208 if (o->send == WILL && o->option == TELOPT_NAWS)
209 telnet_size();
210 if (o->send == WILL &&
211 (o->option == TELOPT_NEW_ENVIRON ||
212 o->option == TELOPT_OLD_ENVIRON)) {
213 /*
214 * We may only have one kind of ENVIRON going at a time.
215 * This is a hack, but who cares.
216 */
217 deactivate_option (o->option==TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv);
218 }
684d367c 219 if (o->option == TELOPT_ECHO)
220 {
221 cfg.ldisc_term = FALSE;
222 ldisc = &ldisc_simple;
223 }
374330e2 224}
225
226static void refused_option (struct Opt *o) {
227 if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON &&
228 o_oenv.state == INACTIVE) {
229 send_opt (WILL, TELOPT_OLD_ENVIRON);
230 o_oenv.state = REQUESTED;
231 }
684d367c 232 if (o->option == TELOPT_ECHO)
233 {
234 cfg.ldisc_term = TRUE;
235 ldisc = &ldisc_term;
236 }
374330e2 237}
238
239static void proc_rec_opt (int cmd, int option) {
240 struct Opt **o;
241
242 log_option ("server", cmd, option);
243 for (o = opts; *o; o++) {
244 if ((*o)->option == option && (*o)->ack == cmd) {
245 switch ((*o)->state) {
246 case REQUESTED:
247 (*o)->state = ACTIVE;
248 activate_option (*o);
249 break;
250 case ACTIVE:
251 break;
252 case INACTIVE:
253 (*o)->state = ACTIVE;
254 send_opt ((*o)->send, option);
255 activate_option (*o);
256 break;
257 case REALLY_INACTIVE:
258 send_opt ((*o)->nsend, option);
259 break;
260 }
261 return;
262 } else if ((*o)->option == option && (*o)->nak == cmd) {
263 switch ((*o)->state) {
264 case REQUESTED:
265 (*o)->state = INACTIVE;
266 refused_option (*o);
267 break;
268 case ACTIVE:
269 (*o)->state = INACTIVE;
270 send_opt ((*o)->nsend, option);
271 break;
272 case INACTIVE:
273 case REALLY_INACTIVE:
274 break;
275 }
276 return;
277 }
278 }
279 /*
280 * If we reach here, the option was one we weren't prepared to
281 * cope with. So send a negative ack.
282 */
283 send_opt ((cmd == WILL ? DONT : WONT), option);
284}
285
286static void process_subneg (void) {
287 unsigned char b[2048], *p, *q;
288 int var, value, n;
289 char *e;
290
291 switch (sb_opt) {
292 case TELOPT_TSPEED:
293 if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) {
294 char logbuf[sizeof(cfg.termspeed)+80];
295 b[0] = IAC; b[1] = SB; b[2] = TELOPT_TSPEED;
296 b[3] = TELQUAL_IS;
297 strcpy(b+4, cfg.termspeed);
298 n = 4 + strlen(cfg.termspeed);
299 b[n] = IAC; b[n+1] = SE;
300 s_write (b, n+2);
c5e9c988 301 logevent("server:\tSB TSPEED SEND");
374330e2 302 sprintf(logbuf, "client:\tSB TSPEED IS %s", cfg.termspeed);
c5e9c988 303 logevent (logbuf);
374330e2 304 } else
c5e9c988 305 logevent ("server:\tSB TSPEED <something weird>");
374330e2 306 break;
307 case TELOPT_TTYPE:
308 if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) {
309 char logbuf[sizeof(cfg.termtype)+80];
310 b[0] = IAC; b[1] = SB; b[2] = TELOPT_TTYPE;
311 b[3] = TELQUAL_IS;
312 for (n = 0; cfg.termtype[n]; n++)
313 b[n+4] = (cfg.termtype[n] >= 'a' && cfg.termtype[n] <= 'z' ?
314 cfg.termtype[n] + 'A'-'a' : cfg.termtype[n]);
315 b[n+4] = IAC; b[n+5] = SE;
316 s_write (b, n+6);
317 b[n+4] = 0;
c5e9c988 318 logevent("server:\tSB TTYPE SEND");
374330e2 319 sprintf(logbuf, "client:\tSB TTYPE IS %s", b+4);
c5e9c988 320 logevent(logbuf);
374330e2 321 } else
c5e9c988 322 logevent("server:\tSB TTYPE <something weird>\r\n");
374330e2 323 break;
324 case TELOPT_OLD_ENVIRON:
325 case TELOPT_NEW_ENVIRON:
326 p = sb_buf;
327 q = p + sb_len;
328 if (p < q && *p == TELQUAL_SEND) {
329 char logbuf[50];
330 p++;
331 sprintf (logbuf, "server:\tSB %s SEND", telopt(sb_opt));
c5e9c988 332 logevent (logbuf);
374330e2 333 if (sb_opt == TELOPT_OLD_ENVIRON) {
334 if (cfg.rfc_environ) {
335 value = RFC_VALUE;
336 var = RFC_VAR;
337 } else {
338 value = BSD_VALUE;
339 var = BSD_VAR;
340 }
341 /*
342 * Try to guess the sense of VAR and VALUE.
343 */
344 while (p < q) {
345 if (*p == RFC_VAR) {
346 value = RFC_VALUE;
347 var = RFC_VAR;
348 } else if (*p == BSD_VAR) {
349 value = BSD_VALUE;
350 var = BSD_VAR;
351 }
352 p++;
353 }
354 } else {
355 /*
356 * With NEW_ENVIRON, the sense of VAR and VALUE
357 * isn't in doubt.
358 */
359 value = RFC_VALUE;
360 var = RFC_VAR;
361 }
362 b[0] = IAC; b[1] = SB; b[2] = sb_opt;
363 b[3] = TELQUAL_IS;
364 n = 4;
37508af4 365 e = cfg.environmt;
374330e2 366 while (*e) {
367 b[n++] = var;
368 while (*e && *e != '\t') b[n++] = *e++;
369 if (*e == '\t') e++;
370 b[n++] = value;
371 while (*e) b[n++] = *e++;
372 e++;
373 }
374 if (*cfg.username) {
375 b[n++] = var; b[n++] = 'U'; b[n++] = 'S';
376 b[n++] = 'E'; b[n++] = 'R'; b[n++] = value;
377 e = cfg.username;
378 while (*e) b[n++] = *e++;
379 }
380 b[n++] = IAC; b[n++] = SE;
381 s_write (b, n);
382 sprintf(logbuf, "client:\tSB %s IS %s", telopt(sb_opt),
383 n==6 ? "<nothing>" : "<stuff>");
c5e9c988 384 logevent (logbuf);
374330e2 385 }
386 break;
387 }
388}
389
390static enum {
391 TOPLEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT,
392 SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR
393} telnet_state = TOPLEVEL;
394
395static void do_telnet_read (char *buf, int len) {
396 unsigned char b[10];
397
398 while (len--) {
399 int c = (unsigned char) *buf++;
400
401 switch (telnet_state) {
402 case TOPLEVEL:
403 case SEENCR:
404 if (c == NUL && telnet_state == SEENCR)
405 telnet_state = TOPLEVEL;
406 else if (c == IAC)
407 telnet_state = SEENIAC;
408 else {
409 b[0] = c;
410#if 0
411 if (!in_synch)
412#endif
413 c_write (b, 1);
414 if (c == CR)
415 telnet_state = SEENCR;
416 else
417 telnet_state = TOPLEVEL;
418 }
419 break;
420 case SEENIAC:
421 if (c == DO) telnet_state = SEENDO;
422 else if (c == DONT) telnet_state = SEENDONT;
423 else if (c == WILL) telnet_state = SEENWILL;
424 else if (c == WONT) telnet_state = SEENWONT;
425 else if (c == SB) telnet_state = SEENSB;
300d41b0 426 else {
ded38628 427 /* ignore everything else; print it if it's IAC */
428 if (c == IAC) {
429 b[0] = c;
430 c_write(b,1);
431 }
300d41b0 432 telnet_state = TOPLEVEL;
433 }
374330e2 434 break;
435 case SEENWILL:
436 proc_rec_opt (WILL, c);
437 telnet_state = TOPLEVEL;
438 break;
439 case SEENWONT:
440 proc_rec_opt (WONT, c);
441 telnet_state = TOPLEVEL;
442 break;
443 case SEENDO:
444 proc_rec_opt (DO, c);
445 telnet_state = TOPLEVEL;
446 break;
447 case SEENDONT:
448 proc_rec_opt (DONT, c);
449 telnet_state = TOPLEVEL;
450 break;
451 case SEENSB:
452 sb_opt = c;
453 sb_len = 0;
454 telnet_state = SUBNEGOT;
455 break;
456 case SUBNEGOT:
457 if (c == IAC)
458 telnet_state = SUBNEG_IAC;
459 else {
460 subneg_addchar:
461 if (sb_len >= sb_size) {
462 char *newbuf;
463 sb_size += SB_DELTA;
464 newbuf = (sb_buf ?
465 realloc(sb_buf, sb_size) :
466 malloc(sb_size));
467 if (newbuf)
468 sb_buf = newbuf;
469 else
470 sb_size -= SB_DELTA;
471 }
472 if (sb_len < sb_size)
473 sb_buf[sb_len++] = c;
474 telnet_state = SUBNEGOT;/* in case we came here by goto */
475 }
476 break;
477 case SUBNEG_IAC:
478 if (c != SE)
479 goto subneg_addchar; /* yes, it's a hack, I know, but... */
480 else {
481 process_subneg();
482 telnet_state = TOPLEVEL;
483 }
484 break;
485 }
486 }
487}
488
489/*
490 * Called to set up the Telnet connection. Will arrange for
491 * WM_NETEVENT messages to be passed to the specified window, whose
492 * window procedure should then call telnet_msg().
493 *
494 * Returns an error message, or NULL on success.
495 *
496 * Also places the canonical host name into `realhost'.
497 */
498static char *telnet_init (HWND hwnd, char *host, int port, char **realhost) {
499 SOCKADDR_IN addr;
500 struct hostent *h;
501 unsigned long a;
502
503 /*
504 * Try to find host.
505 */
506 if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
507 if ( (h = gethostbyname(host)) == NULL)
508 switch (WSAGetLastError()) {
509 case WSAENETDOWN: return "Network is down";
510 case WSAHOST_NOT_FOUND: case WSANO_DATA:
511 return "Host does not exist";
512 case WSATRY_AGAIN: return "Host not found";
513 default: return "gethostbyname: unknown error";
514 }
515 memcpy (&a, h->h_addr, sizeof(a));
516 *realhost = h->h_name;
517 } else
518 *realhost = host;
519 a = ntohl(a);
520
521 if (port < 0)
522 port = 23; /* default telnet port */
523
524 /*
525 * Open socket.
526 */
527 s = socket(AF_INET, SOCK_STREAM, 0);
528 if (s == INVALID_SOCKET)
529 switch (WSAGetLastError()) {
530 case WSAENETDOWN: return "Network is down";
531 case WSAEAFNOSUPPORT: return "TCP/IP support not present";
532 default: return "socket(): unknown error";
533 }
534
535#if 0
536 {
537 BOOL b = TRUE;
538 setsockopt (s, SOL_SOCKET, SO_OOBINLINE, (void *)&b, sizeof(b));
539 }
540#endif
541
542 /*
543 * Bind to local address.
544 */
545 addr.sin_family = AF_INET;
546 addr.sin_addr.s_addr = htonl(INADDR_ANY);
547 addr.sin_port = htons(0);
548 if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
549 switch (WSAGetLastError()) {
550 case WSAENETDOWN: return "Network is down";
551 default: return "bind(): unknown error";
552 }
553
554 /*
555 * Connect to remote address.
556 */
557 addr.sin_addr.s_addr = htonl(a);
558 addr.sin_port = htons((short)port);
559 if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
560 switch (WSAGetLastError()) {
561 case WSAENETDOWN: return "Network is down";
562 case WSAECONNREFUSED: return "Connection refused";
563 case WSAENETUNREACH: return "Network is unreachable";
564 case WSAEHOSTUNREACH: return "No route to host";
565 default: return "connect(): unknown error";
566 }
567
568 if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ |
569 FD_WRITE | FD_OOB | FD_CLOSE) == SOCKET_ERROR)
570 switch (WSAGetLastError()) {
571 case WSAENETDOWN: return "Network is down";
572 default: return "WSAAsyncSelect(): unknown error";
573 }
574
575 /*
576 * Initialise option states.
577 */
eb5e1db9 578 if( cfg.ldisc_term )
579 {
580 struct Opt **o;
581
582 for (o = opts; *o; o++)
583 if ((*o)->state == REQUESTED)
584 (*o)->state = INACTIVE;
585 }
586 else
374330e2 587 {
588 struct Opt **o;
589
590 for (o = opts; *o; o++)
591 if ((*o)->state == REQUESTED)
592 send_opt ((*o)->send, (*o)->option);
593 }
594
595#if 0
596 /*
597 * Set up SYNCH state.
598 */
599 in_synch = FALSE;
600#endif
601
602 return NULL;
603}
604
605/*
606 * Process a WM_NETEVENT message. Will return 0 if the connection
607 * has closed, or <0 for a socket error.
608 */
609static int telnet_msg (WPARAM wParam, LPARAM lParam) {
610 int ret;
611 char buf[256];
612
8ce72d2c 613 /*
614 * Because reading less than the whole of the available pending
615 * data can generate an FD_READ event, we need to allow for the
616 * possibility that FD_READ may arrive with FD_CLOSE already in
617 * the queue; so it's possible that we can get here even with s
618 * invalid. If so, we return 1 and don't worry about it.
619 */
620 if (s == INVALID_SOCKET)
621 return 1;
374330e2 622
623 if (WSAGETSELECTERROR(lParam) != 0)
624 return -WSAGETSELECTERROR(lParam);
625
626 switch (WSAGETSELECTEVENT(lParam)) {
627 case FD_READ:
8ce72d2c 628 case FD_CLOSE:
374330e2 629 ret = recv(s, buf, sizeof(buf), 0);
630 if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK)
631 return 1;
632 if (ret < 0) /* any _other_ error */
633 return -10000-WSAGetLastError();
634 if (ret == 0) {
635 s = INVALID_SOCKET;
8ce72d2c 636 return 0;
374330e2 637 }
638#if 0
639 if (in_synch) {
640 BOOL i;
641 if (ioctlsocket (s, SIOCATMARK, &i) < 0) {
642 return -20000-WSAGetLastError();
643 }
644 if (i)
645 in_synch = FALSE;
646 }
647#endif
648 do_telnet_read (buf, ret);
649 return 1;
650 case FD_OOB:
651 do {
652 ret = recv(s, buf, sizeof(buf), 0);
653 } while (ret > 0);
654 telnet_state = TOPLEVEL;
655 do {
656 ret = recv(s, buf, 1, MSG_OOB);
657 if (ret > 0)
658 do_telnet_read (buf, ret);
659 } while (ret > 0);
660 if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK)
661 return -30000-WSAGetLastError();
662 return 1;
663 case FD_WRITE:
664 if (outbuf_head != outbuf_reap)
665 try_write();
666 return 1;
374330e2 667 }
668 return 1; /* shouldn't happen, but WTF */
669}
670
671/*
672 * Called to send data down the Telnet connection.
673 */
674static void telnet_send (char *buf, int len) {
675 char *p;
676 static unsigned char iac[2] = { IAC, IAC };
677 static unsigned char cr[2] = { CR, NUL };
eb5e1db9 678 static unsigned char nl[2] = { CR, LF };
374330e2 679
680 if (s == INVALID_SOCKET)
681 return;
682
683 p = buf;
eb5e1db9 684 if (cfg.ldisc_term) {
685 while (p < buf+len) {
686 char *q = p;
687 unsigned char * cstr = 0;
688 while (p < buf+len) {
689 if ((unsigned char)*p == IAC) {
690 cstr = iac;
691 break;
692 }
693 if (*p == '\r') {
694 if( p+1 >= buf+len || ( p[1] != '\n' && p[1] != '\0'))
695 {
696 cstr = cr;
697 break;
698 }
699 }
700 p++;
701 }
702 if (p!=q) s_write (q, p-q);
703 if (cstr) s_write (cstr,2), p++;
704 }
705 } else while (p < buf+len) {
374330e2 706 char *q = p;
707
708 while (iswritable((unsigned char)*p) && p < buf+len) p++;
709 s_write (q, p-q);
710
711 while (p < buf+len && !iswritable((unsigned char)*p)) {
eb5e1db9 712 s_write ((unsigned char)*p == IAC ? iac : nl, 2);
374330e2 713 p++;
714 }
715 }
716}
717
718/*
719 * Called to set the size of the window from Telnet's POV.
720 */
721static void telnet_size(void) {
722 unsigned char b[16];
723 char logbuf[50];
724
725 if (s == INVALID_SOCKET || o_naws.state != ACTIVE)
726 return;
727 b[0] = IAC; b[1] = SB; b[2] = TELOPT_NAWS;
728 b[3] = cols >> 8; b[4] = cols & 0xFF;
729 b[5] = rows >> 8; b[6] = rows & 0xFF;
730 b[7] = IAC; b[8] = SE;
731 s_write (b, 9);
732 sprintf(logbuf, "client:\tSB NAWS %d,%d",
733 ((unsigned char)b[3] << 8) + (unsigned char)b[4],
734 ((unsigned char)b[5] << 8) + (unsigned char)b[6]);
c5e9c988 735 logevent (logbuf);
374330e2 736}
737
738/*
739 * Send Telnet special codes.
740 */
741static void telnet_special (Telnet_Special code) {
742 unsigned char b[2];
743
744 if (s == INVALID_SOCKET)
745 return;
746
747 b[0] = IAC;
748 switch (code) {
749 case TS_AYT: b[1] = AYT; s_write (b, 2); break;
750 case TS_BRK: b[1] = BREAK; s_write (b, 2); break;
751 case TS_EC: b[1] = EC; s_write (b, 2); break;
752 case TS_EL: b[1] = EL; s_write (b, 2); break;
753 case TS_GA: b[1] = GA; s_write (b, 2); break;
754 case TS_NOP: b[1] = NOP; s_write (b, 2); break;
755 case TS_ABORT: b[1] = ABORT; s_write (b, 2); break;
756 case TS_AO: b[1] = AO; s_write (b, 2); break;
757 case TS_IP: b[1] = IP; s_write (b, 2); break;
758 case TS_SUSP: b[1] = SUSP; s_write (b, 2); break;
759 case TS_EOR: b[1] = EOR; s_write (b, 2); break;
760 case TS_EOF: b[1] = xEOF; s_write (b, 2); break;
761 case TS_SYNCH:
762 outbuf_head = outbuf_reap = 0;
684d367c 763 b[1] = DM;
764 send (s, b, 2, MSG_OOB);
765 break;
766 case TS_RECHO:
767 if (o_echo.state == INACTIVE || o_echo.state == REALLY_INACTIVE) {
768 o_echo.state = REQUESTED;
769 send_opt (o_echo.send, o_echo.option);
770 }
771 break;
772 case TS_LECHO:
773 if (o_echo.state == ACTIVE) {
774 o_echo.state = REQUESTED;
775 send_opt (o_echo.nsend, o_echo.option);
776 }
374330e2 777 break;
778 }
779}
780
781Backend telnet_backend = {
782 telnet_init,
783 telnet_msg,
784 telnet_send,
785 telnet_size,
786 telnet_special
787};
Local modifications for Simon Tatham's `PuTTY' SSH client and terminal emulator