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 | |
15 | static 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 | |
95 | static 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 | |
108 | static void telnet_size(void); |
109 | |
110 | struct 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 | |
120 | static struct Opt o_naws = {WILL, WONT, DO, DONT, TELOPT_NAWS, REQUESTED}; |
121 | static struct Opt o_tspeed = {WILL, WONT, DO, DONT, TELOPT_TSPEED, REQUESTED}; |
122 | static struct Opt o_ttype = {WILL, WONT, DO, DONT, TELOPT_TTYPE, REQUESTED}; |
123 | static struct Opt o_oenv = {WILL, WONT, DO, DONT, TELOPT_OLD_ENVIRON, |
124 | INACTIVE}; |
125 | static struct Opt o_nenv = {WILL, WONT, DO, DONT, TELOPT_NEW_ENVIRON, |
126 | REQUESTED}; |
127 | static struct Opt o_echo = {DO, DONT, WILL, WONT, TELOPT_ECHO, REQUESTED}; |
128 | static struct Opt o_we_sga = {WILL, WONT, DO, DONT, TELOPT_SGA, REQUESTED}; |
129 | static struct Opt o_they_sga = {DO, DONT, WILL, WONT, TELOPT_SGA, REQUESTED}; |
130 | |
131 | static 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 | |
374330e2 |
136 | static int in_synch; |
374330e2 |
137 | static int sb_opt, sb_len; |
138 | static char *sb_buf = NULL; |
139 | static int sb_size = 0; |
140 | #define SB_DELTA 1024 |
141 | |
142 | static void try_write (void) { |
143 | while (outbuf_head != outbuf_reap) { |
144 | int end = (outbuf_reap < outbuf_head ? outbuf_head : OUTBUF_SIZE); |
145 | int len = end - outbuf_reap; |
146 | int ret; |
147 | |
148 | ret = send (s, outbuf+outbuf_reap, len, 0); |
149 | if (ret > 0) |
150 | outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK; |
151 | if (ret < len) |
152 | return; |
153 | } |
154 | } |
155 | |
156 | static void s_write (void *buf, int len) { |
157 | unsigned char *p = buf; |
158 | while (len--) { |
159 | int new_head = (outbuf_head + 1) & OUTBUF_MASK; |
160 | if (new_head != outbuf_reap) { |
161 | outbuf[outbuf_head] = *p++; |
162 | outbuf_head = new_head; |
163 | } |
164 | } |
165 | try_write(); |
166 | } |
167 | |
374330e2 |
168 | static void log_option (char *sender, int cmd, int option) { |
169 | char buf[50]; |
170 | sprintf(buf, "%s:\t%s %s", sender, |
171 | (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" : |
172 | cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<??>"), |
173 | telopt(option)); |
c5e9c988 |
174 | logevent(buf); |
374330e2 |
175 | } |
176 | |
177 | static void send_opt (int cmd, int option) { |
178 | unsigned char b[3]; |
179 | |
180 | b[0] = IAC; b[1] = cmd; b[2] = option; |
181 | s_write (b, 3); |
182 | log_option("client", cmd, option); |
183 | } |
184 | |
185 | static void deactivate_option (struct Opt *o) { |
186 | if (o->state == REQUESTED || o->state == ACTIVE) |
187 | send_opt (o->nsend, o->option); |
188 | o->state = REALLY_INACTIVE; |
189 | } |
190 | |
191 | static void activate_option (struct Opt *o) { |
192 | if (o->send == WILL && o->option == TELOPT_NAWS) |
193 | telnet_size(); |
194 | if (o->send == WILL && |
195 | (o->option == TELOPT_NEW_ENVIRON || |
196 | o->option == TELOPT_OLD_ENVIRON)) { |
197 | /* |
198 | * We may only have one kind of ENVIRON going at a time. |
199 | * This is a hack, but who cares. |
200 | */ |
201 | deactivate_option (o->option==TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv); |
202 | } |
2f938b83 |
203 | if (o->option == TELOPT_ECHO && cfg.ldisc_term) |
684d367c |
204 | ldisc = &ldisc_simple; |
374330e2 |
205 | } |
206 | |
207 | static void refused_option (struct Opt *o) { |
208 | if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON && |
209 | o_oenv.state == INACTIVE) { |
210 | send_opt (WILL, TELOPT_OLD_ENVIRON); |
211 | o_oenv.state = REQUESTED; |
212 | } |
2f938b83 |
213 | if (o->option == TELOPT_ECHO && cfg.ldisc_term) |
684d367c |
214 | ldisc = &ldisc_term; |
374330e2 |
215 | } |
216 | |
217 | static void proc_rec_opt (int cmd, int option) { |
218 | struct Opt **o; |
219 | |
220 | log_option ("server", cmd, option); |
221 | for (o = opts; *o; o++) { |
222 | if ((*o)->option == option && (*o)->ack == cmd) { |
223 | switch ((*o)->state) { |
224 | case REQUESTED: |
225 | (*o)->state = ACTIVE; |
226 | activate_option (*o); |
227 | break; |
228 | case ACTIVE: |
229 | break; |
230 | case INACTIVE: |
231 | (*o)->state = ACTIVE; |
232 | send_opt ((*o)->send, option); |
233 | activate_option (*o); |
234 | break; |
235 | case REALLY_INACTIVE: |
236 | send_opt ((*o)->nsend, option); |
237 | break; |
238 | } |
239 | return; |
240 | } else if ((*o)->option == option && (*o)->nak == cmd) { |
241 | switch ((*o)->state) { |
242 | case REQUESTED: |
243 | (*o)->state = INACTIVE; |
244 | refused_option (*o); |
245 | break; |
246 | case ACTIVE: |
247 | (*o)->state = INACTIVE; |
248 | send_opt ((*o)->nsend, option); |
249 | break; |
250 | case INACTIVE: |
251 | case REALLY_INACTIVE: |
252 | break; |
253 | } |
254 | return; |
255 | } |
256 | } |
257 | /* |
258 | * If we reach here, the option was one we weren't prepared to |
259 | * cope with. So send a negative ack. |
260 | */ |
261 | send_opt ((cmd == WILL ? DONT : WONT), option); |
262 | } |
263 | |
264 | static void process_subneg (void) { |
265 | unsigned char b[2048], *p, *q; |
266 | int var, value, n; |
267 | char *e; |
268 | |
269 | switch (sb_opt) { |
270 | case TELOPT_TSPEED: |
271 | if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) { |
272 | char logbuf[sizeof(cfg.termspeed)+80]; |
273 | b[0] = IAC; b[1] = SB; b[2] = TELOPT_TSPEED; |
274 | b[3] = TELQUAL_IS; |
275 | strcpy(b+4, cfg.termspeed); |
276 | n = 4 + strlen(cfg.termspeed); |
277 | b[n] = IAC; b[n+1] = SE; |
278 | s_write (b, n+2); |
c5e9c988 |
279 | logevent("server:\tSB TSPEED SEND"); |
374330e2 |
280 | sprintf(logbuf, "client:\tSB TSPEED IS %s", cfg.termspeed); |
c5e9c988 |
281 | logevent (logbuf); |
374330e2 |
282 | } else |
c5e9c988 |
283 | logevent ("server:\tSB TSPEED <something weird>"); |
374330e2 |
284 | break; |
285 | case TELOPT_TTYPE: |
286 | if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) { |
287 | char logbuf[sizeof(cfg.termtype)+80]; |
288 | b[0] = IAC; b[1] = SB; b[2] = TELOPT_TTYPE; |
289 | b[3] = TELQUAL_IS; |
290 | for (n = 0; cfg.termtype[n]; n++) |
291 | b[n+4] = (cfg.termtype[n] >= 'a' && cfg.termtype[n] <= 'z' ? |
292 | cfg.termtype[n] + 'A'-'a' : cfg.termtype[n]); |
293 | b[n+4] = IAC; b[n+5] = SE; |
294 | s_write (b, n+6); |
295 | b[n+4] = 0; |
c5e9c988 |
296 | logevent("server:\tSB TTYPE SEND"); |
374330e2 |
297 | sprintf(logbuf, "client:\tSB TTYPE IS %s", b+4); |
c5e9c988 |
298 | logevent(logbuf); |
374330e2 |
299 | } else |
c5e9c988 |
300 | logevent("server:\tSB TTYPE <something weird>\r\n"); |
374330e2 |
301 | break; |
302 | case TELOPT_OLD_ENVIRON: |
303 | case TELOPT_NEW_ENVIRON: |
304 | p = sb_buf; |
305 | q = p + sb_len; |
306 | if (p < q && *p == TELQUAL_SEND) { |
307 | char logbuf[50]; |
308 | p++; |
309 | sprintf (logbuf, "server:\tSB %s SEND", telopt(sb_opt)); |
c5e9c988 |
310 | logevent (logbuf); |
374330e2 |
311 | if (sb_opt == TELOPT_OLD_ENVIRON) { |
312 | if (cfg.rfc_environ) { |
313 | value = RFC_VALUE; |
314 | var = RFC_VAR; |
315 | } else { |
316 | value = BSD_VALUE; |
317 | var = BSD_VAR; |
318 | } |
319 | /* |
320 | * Try to guess the sense of VAR and VALUE. |
321 | */ |
322 | while (p < q) { |
323 | if (*p == RFC_VAR) { |
324 | value = RFC_VALUE; |
325 | var = RFC_VAR; |
326 | } else if (*p == BSD_VAR) { |
327 | value = BSD_VALUE; |
328 | var = BSD_VAR; |
329 | } |
330 | p++; |
331 | } |
332 | } else { |
333 | /* |
334 | * With NEW_ENVIRON, the sense of VAR and VALUE |
335 | * isn't in doubt. |
336 | */ |
337 | value = RFC_VALUE; |
338 | var = RFC_VAR; |
339 | } |
340 | b[0] = IAC; b[1] = SB; b[2] = sb_opt; |
341 | b[3] = TELQUAL_IS; |
342 | n = 4; |
37508af4 |
343 | e = cfg.environmt; |
374330e2 |
344 | while (*e) { |
345 | b[n++] = var; |
346 | while (*e && *e != '\t') b[n++] = *e++; |
347 | if (*e == '\t') e++; |
348 | b[n++] = value; |
349 | while (*e) b[n++] = *e++; |
350 | e++; |
351 | } |
352 | if (*cfg.username) { |
353 | b[n++] = var; b[n++] = 'U'; b[n++] = 'S'; |
354 | b[n++] = 'E'; b[n++] = 'R'; b[n++] = value; |
355 | e = cfg.username; |
356 | while (*e) b[n++] = *e++; |
357 | } |
358 | b[n++] = IAC; b[n++] = SE; |
359 | s_write (b, n); |
360 | sprintf(logbuf, "client:\tSB %s IS %s", telopt(sb_opt), |
361 | n==6 ? "<nothing>" : "<stuff>"); |
c5e9c988 |
362 | logevent (logbuf); |
374330e2 |
363 | } |
364 | break; |
365 | } |
366 | } |
367 | |
368 | static enum { |
369 | TOPLEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT, |
370 | SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR |
371 | } telnet_state = TOPLEVEL; |
372 | |
373 | static void do_telnet_read (char *buf, int len) { |
374330e2 |
374 | |
375 | while (len--) { |
376 | int c = (unsigned char) *buf++; |
377 | |
378 | switch (telnet_state) { |
379 | case TOPLEVEL: |
380 | case SEENCR: |
381 | if (c == NUL && telnet_state == SEENCR) |
382 | telnet_state = TOPLEVEL; |
383 | else if (c == IAC) |
384 | telnet_state = SEENIAC; |
385 | else { |
374330e2 |
386 | if (!in_synch) |
c9def1b8 |
387 | c_write1(c); |
2f938b83 |
388 | |
389 | #if 1 |
390 | /* I can't get the F***ing winsock to insert the urgent IAC |
391 | * into the right position! Even with SO_OOBINLINE it gives |
392 | * it to recv too soon. And of course the DM byte (that |
393 | * arrives in the same packet!) appears several K later!! |
394 | * |
395 | * Oh well, we do get the DM in the right place so I'll |
396 | * just stop hiding on the next 0xf2 and hope for the best. |
397 | */ |
398 | else if (c == DM) in_synch = 0; |
399 | #endif |
374330e2 |
400 | if (c == CR) |
401 | telnet_state = SEENCR; |
402 | else |
403 | telnet_state = TOPLEVEL; |
404 | } |
405 | break; |
406 | case SEENIAC: |
407 | if (c == DO) telnet_state = SEENDO; |
408 | else if (c == DONT) telnet_state = SEENDONT; |
409 | else if (c == WILL) telnet_state = SEENWILL; |
410 | else if (c == WONT) telnet_state = SEENWONT; |
411 | else if (c == SB) telnet_state = SEENSB; |
2f938b83 |
412 | else if (c == DM) { |
413 | in_synch = 0; |
414 | telnet_state = TOPLEVEL; |
415 | } |
300d41b0 |
416 | else { |
ded38628 |
417 | /* ignore everything else; print it if it's IAC */ |
418 | if (c == IAC) { |
c9def1b8 |
419 | c_write1(c); |
ded38628 |
420 | } |
300d41b0 |
421 | telnet_state = TOPLEVEL; |
422 | } |
374330e2 |
423 | break; |
424 | case SEENWILL: |
425 | proc_rec_opt (WILL, c); |
426 | telnet_state = TOPLEVEL; |
427 | break; |
428 | case SEENWONT: |
429 | proc_rec_opt (WONT, c); |
430 | telnet_state = TOPLEVEL; |
431 | break; |
432 | case SEENDO: |
433 | proc_rec_opt (DO, c); |
434 | telnet_state = TOPLEVEL; |
435 | break; |
436 | case SEENDONT: |
437 | proc_rec_opt (DONT, c); |
438 | telnet_state = TOPLEVEL; |
439 | break; |
440 | case SEENSB: |
441 | sb_opt = c; |
442 | sb_len = 0; |
443 | telnet_state = SUBNEGOT; |
444 | break; |
445 | case SUBNEGOT: |
446 | if (c == IAC) |
447 | telnet_state = SUBNEG_IAC; |
448 | else { |
449 | subneg_addchar: |
450 | if (sb_len >= sb_size) { |
451 | char *newbuf; |
452 | sb_size += SB_DELTA; |
453 | newbuf = (sb_buf ? |
c9def1b8 |
454 | srealloc(sb_buf, sb_size) : |
455 | smalloc(sb_size)); |
374330e2 |
456 | if (newbuf) |
457 | sb_buf = newbuf; |
458 | else |
459 | sb_size -= SB_DELTA; |
460 | } |
461 | if (sb_len < sb_size) |
462 | sb_buf[sb_len++] = c; |
463 | telnet_state = SUBNEGOT;/* in case we came here by goto */ |
464 | } |
465 | break; |
466 | case SUBNEG_IAC: |
467 | if (c != SE) |
468 | goto subneg_addchar; /* yes, it's a hack, I know, but... */ |
469 | else { |
470 | process_subneg(); |
471 | telnet_state = TOPLEVEL; |
472 | } |
473 | break; |
474 | } |
475 | } |
476 | } |
477 | |
478 | /* |
479 | * Called to set up the Telnet connection. Will arrange for |
480 | * WM_NETEVENT messages to be passed to the specified window, whose |
481 | * window procedure should then call telnet_msg(). |
482 | * |
483 | * Returns an error message, or NULL on success. |
484 | * |
485 | * Also places the canonical host name into `realhost'. |
486 | */ |
487 | static char *telnet_init (HWND hwnd, char *host, int port, char **realhost) { |
488 | SOCKADDR_IN addr; |
489 | struct hostent *h; |
490 | unsigned long a; |
491 | |
492 | /* |
493 | * Try to find host. |
494 | */ |
495 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
496 | if ( (h = gethostbyname(host)) == NULL) |
497 | switch (WSAGetLastError()) { |
498 | case WSAENETDOWN: return "Network is down"; |
499 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
500 | return "Host does not exist"; |
501 | case WSATRY_AGAIN: return "Host not found"; |
502 | default: return "gethostbyname: unknown error"; |
503 | } |
504 | memcpy (&a, h->h_addr, sizeof(a)); |
505 | *realhost = h->h_name; |
506 | } else |
507 | *realhost = host; |
508 | a = ntohl(a); |
509 | |
510 | if (port < 0) |
511 | port = 23; /* default telnet port */ |
512 | |
513 | /* |
514 | * Open socket. |
515 | */ |
516 | s = socket(AF_INET, SOCK_STREAM, 0); |
517 | if (s == INVALID_SOCKET) |
518 | switch (WSAGetLastError()) { |
519 | case WSAENETDOWN: return "Network is down"; |
520 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
521 | default: return "socket(): unknown error"; |
522 | } |
523 | |
374330e2 |
524 | { |
525 | BOOL b = TRUE; |
526 | setsockopt (s, SOL_SOCKET, SO_OOBINLINE, (void *)&b, sizeof(b)); |
527 | } |
374330e2 |
528 | |
529 | /* |
530 | * Bind to local address. |
531 | */ |
532 | addr.sin_family = AF_INET; |
533 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
534 | addr.sin_port = htons(0); |
535 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
536 | switch (WSAGetLastError()) { |
537 | case WSAENETDOWN: return "Network is down"; |
538 | default: return "bind(): unknown error"; |
539 | } |
540 | |
541 | /* |
542 | * Connect to remote address. |
543 | */ |
544 | addr.sin_addr.s_addr = htonl(a); |
545 | addr.sin_port = htons((short)port); |
546 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
547 | switch (WSAGetLastError()) { |
548 | case WSAENETDOWN: return "Network is down"; |
549 | case WSAECONNREFUSED: return "Connection refused"; |
550 | case WSAENETUNREACH: return "Network is unreachable"; |
551 | case WSAEHOSTUNREACH: return "No route to host"; |
552 | default: return "connect(): unknown error"; |
553 | } |
554 | |
4017be6d |
555 | if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | |
374330e2 |
556 | FD_WRITE | FD_OOB | FD_CLOSE) == SOCKET_ERROR) |
557 | switch (WSAGetLastError()) { |
558 | case WSAENETDOWN: return "Network is down"; |
559 | default: return "WSAAsyncSelect(): unknown error"; |
560 | } |
561 | |
562 | /* |
563 | * Initialise option states. |
564 | */ |
eb5e1db9 |
565 | if( cfg.ldisc_term ) |
566 | { |
567 | struct Opt **o; |
568 | |
569 | for (o = opts; *o; o++) |
570 | if ((*o)->state == REQUESTED) |
571 | (*o)->state = INACTIVE; |
572 | } |
573 | else |
374330e2 |
574 | { |
575 | struct Opt **o; |
576 | |
577 | for (o = opts; *o; o++) |
578 | if ((*o)->state == REQUESTED) |
579 | send_opt ((*o)->send, (*o)->option); |
580 | } |
581 | |
374330e2 |
582 | /* |
583 | * Set up SYNCH state. |
584 | */ |
585 | in_synch = FALSE; |
374330e2 |
586 | return NULL; |
587 | } |
588 | |
589 | /* |
590 | * Process a WM_NETEVENT message. Will return 0 if the connection |
591 | * has closed, or <0 for a socket error. |
592 | */ |
593 | static int telnet_msg (WPARAM wParam, LPARAM lParam) { |
594 | int ret; |
c9def1b8 |
595 | /* This needs to be larger than the packet size now that inbuf |
596 | * cannot overflow, in fact the fewer calls we make to windows |
597 | * the faster we will run! |
598 | */ |
599 | char buf[16384]; |
374330e2 |
600 | |
8ce72d2c |
601 | /* |
602 | * Because reading less than the whole of the available pending |
603 | * data can generate an FD_READ event, we need to allow for the |
604 | * possibility that FD_READ may arrive with FD_CLOSE already in |
605 | * the queue; so it's possible that we can get here even with s |
606 | * invalid. If so, we return 1 and don't worry about it. |
607 | */ |
608 | if (s == INVALID_SOCKET) |
609 | return 1; |
374330e2 |
610 | |
611 | if (WSAGETSELECTERROR(lParam) != 0) |
612 | return -WSAGETSELECTERROR(lParam); |
613 | |
614 | switch (WSAGETSELECTEVENT(lParam)) { |
615 | case FD_READ: |
8ce72d2c |
616 | case FD_CLOSE: |
2f938b83 |
617 | { |
618 | int clear_of_oob = 1; |
619 | if (ioctlsocket (s, SIOCATMARK, &clear_of_oob) < 0 ) |
374330e2 |
620 | return -20000-WSAGetLastError(); |
2f938b83 |
621 | |
622 | in_synch = !clear_of_oob; |
623 | |
624 | do { |
625 | ret = recv(s, buf, sizeof(buf), 0); |
626 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
627 | return 1; |
628 | if (ret < 0) /* any _other_ error */ |
629 | return -10000-WSAGetLastError(); |
630 | if (ret == 0) { |
631 | s = INVALID_SOCKET; |
632 | return 0; |
633 | } |
2f938b83 |
634 | do_telnet_read (buf, ret); |
635 | } while (in_synch); |
374330e2 |
636 | } |
374330e2 |
637 | return 1; |
638 | case FD_WRITE: |
639 | if (outbuf_head != outbuf_reap) |
640 | try_write(); |
641 | return 1; |
374330e2 |
642 | } |
643 | return 1; /* shouldn't happen, but WTF */ |
644 | } |
645 | |
646 | /* |
647 | * Called to send data down the Telnet connection. |
648 | */ |
649 | static void telnet_send (char *buf, int len) { |
650 | char *p; |
651 | static unsigned char iac[2] = { IAC, IAC }; |
652 | static unsigned char cr[2] = { CR, NUL }; |
eb5e1db9 |
653 | static unsigned char nl[2] = { CR, LF }; |
374330e2 |
654 | |
655 | if (s == INVALID_SOCKET) |
656 | return; |
657 | |
658 | p = buf; |
2f938b83 |
659 | while (p < buf+len) { |
374330e2 |
660 | char *q = p; |
661 | |
662 | while (iswritable((unsigned char)*p) && p < buf+len) p++; |
663 | s_write (q, p-q); |
664 | |
665 | while (p < buf+len && !iswritable((unsigned char)*p)) { |
eb5e1db9 |
666 | s_write ((unsigned char)*p == IAC ? iac : nl, 2); |
374330e2 |
667 | p++; |
668 | } |
669 | } |
670 | } |
671 | |
672 | /* |
673 | * Called to set the size of the window from Telnet's POV. |
674 | */ |
675 | static void telnet_size(void) { |
676 | unsigned char b[16]; |
677 | char logbuf[50]; |
678 | |
679 | if (s == INVALID_SOCKET || o_naws.state != ACTIVE) |
680 | return; |
681 | b[0] = IAC; b[1] = SB; b[2] = TELOPT_NAWS; |
682 | b[3] = cols >> 8; b[4] = cols & 0xFF; |
683 | b[5] = rows >> 8; b[6] = rows & 0xFF; |
684 | b[7] = IAC; b[8] = SE; |
685 | s_write (b, 9); |
686 | sprintf(logbuf, "client:\tSB NAWS %d,%d", |
687 | ((unsigned char)b[3] << 8) + (unsigned char)b[4], |
688 | ((unsigned char)b[5] << 8) + (unsigned char)b[6]); |
c5e9c988 |
689 | logevent (logbuf); |
374330e2 |
690 | } |
691 | |
692 | /* |
693 | * Send Telnet special codes. |
694 | */ |
695 | static void telnet_special (Telnet_Special code) { |
696 | unsigned char b[2]; |
697 | |
698 | if (s == INVALID_SOCKET) |
699 | return; |
700 | |
701 | b[0] = IAC; |
702 | switch (code) { |
703 | case TS_AYT: b[1] = AYT; s_write (b, 2); break; |
704 | case TS_BRK: b[1] = BREAK; s_write (b, 2); break; |
705 | case TS_EC: b[1] = EC; s_write (b, 2); break; |
706 | case TS_EL: b[1] = EL; s_write (b, 2); break; |
707 | case TS_GA: b[1] = GA; s_write (b, 2); break; |
708 | case TS_NOP: b[1] = NOP; s_write (b, 2); break; |
709 | case TS_ABORT: b[1] = ABORT; s_write (b, 2); break; |
710 | case TS_AO: b[1] = AO; s_write (b, 2); break; |
711 | case TS_IP: b[1] = IP; s_write (b, 2); break; |
712 | case TS_SUSP: b[1] = SUSP; s_write (b, 2); break; |
713 | case TS_EOR: b[1] = EOR; s_write (b, 2); break; |
714 | case TS_EOF: b[1] = xEOF; s_write (b, 2); break; |
715 | case TS_SYNCH: |
716 | outbuf_head = outbuf_reap = 0; |
684d367c |
717 | b[1] = DM; |
718 | send (s, b, 2, MSG_OOB); |
719 | break; |
720 | case TS_RECHO: |
721 | if (o_echo.state == INACTIVE || o_echo.state == REALLY_INACTIVE) { |
722 | o_echo.state = REQUESTED; |
723 | send_opt (o_echo.send, o_echo.option); |
724 | } |
725 | break; |
726 | case TS_LECHO: |
727 | if (o_echo.state == ACTIVE) { |
728 | o_echo.state = REQUESTED; |
729 | send_opt (o_echo.nsend, o_echo.option); |
730 | } |
374330e2 |
731 | break; |
732 | } |
733 | } |
734 | |
8ccc75b0 |
735 | static SOCKET telnet_socket(void) { return s; } |
736 | |
737 | static int telnet_sendok(void) { return 1; } |
4017be6d |
738 | |
374330e2 |
739 | Backend telnet_backend = { |
740 | telnet_init, |
741 | telnet_msg, |
742 | telnet_send, |
743 | telnet_size, |
4017be6d |
744 | telnet_special, |
8ccc75b0 |
745 | telnet_socket, |
746 | telnet_sendok |
374330e2 |
747 | }; |