374330e2 |
1 | #include <stdio.h> |
2 | #include <stdlib.h> |
3 | #include <winsock.h> |
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 | |
14 | #include "ssh.h" |
15 | |
16 | /* Coroutine mechanics for the sillier bits of the code */ |
17 | #define crBegin1 static int crLine = 0; |
18 | #define crBegin2 switch(crLine) { case 0:; |
19 | #define crBegin crBegin1; crBegin2; |
20 | #define crFinish(z) } crLine = 0; return (z) |
21 | #define crFinishV } crLine = 0; return |
22 | #define crReturn(z) \ |
23 | do {\ |
24 | crLine=__LINE__; return (z); case __LINE__:;\ |
25 | } while (0) |
26 | #define crReturnV \ |
27 | do {\ |
28 | crLine=__LINE__; return; case __LINE__:;\ |
29 | } while (0) |
30 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
31 | #define crStopV do{ crLine = 0; return; }while(0) |
32 | |
33 | #ifndef FALSE |
34 | #define FALSE 0 |
35 | #endif |
36 | #ifndef TRUE |
37 | #define TRUE 1 |
38 | #endif |
39 | |
40 | static SOCKET s = INVALID_SOCKET; |
41 | |
42 | static unsigned char session_key[32]; |
43 | static struct ssh_cipher *cipher = NULL; |
44 | |
45 | static char *savedhost; |
46 | |
47 | static enum { |
48 | SSH_STATE_BEFORE_SIZE, |
49 | SSH_STATE_INTERMED, |
50 | SSH_STATE_SESSION |
51 | } ssh_state = SSH_STATE_BEFORE_SIZE; |
52 | |
53 | static int size_needed = FALSE; |
54 | |
55 | static void s_write (char *buf, int len) { |
56 | while (len > 0) { |
57 | int i = send (s, buf, len, 0); |
58 | if (i > 0) |
59 | len -= i, buf += i; |
60 | } |
61 | } |
62 | |
63 | static int s_read (char *buf, int len) { |
64 | int ret = 0; |
65 | while (len > 0) { |
66 | int i = recv (s, buf, len, 0); |
67 | if (i > 0) |
68 | len -= i, buf += i, ret += i; |
69 | else |
70 | return i; |
71 | } |
72 | return ret; |
73 | } |
74 | |
75 | static void c_write (char *buf, int len) { |
76 | while (len--) { |
77 | int new_head = (inbuf_head + 1) & INBUF_MASK; |
78 | int c = (unsigned char) *buf; |
79 | if (new_head != inbuf_reap) { |
80 | inbuf[inbuf_head] = *buf++; |
81 | inbuf_head = new_head; |
82 | } |
83 | } |
84 | } |
85 | |
86 | struct Packet { |
87 | long length; |
88 | int type; |
89 | unsigned long crc; |
90 | unsigned char *data; |
91 | unsigned char *body; |
92 | long maxlen; |
93 | }; |
94 | |
95 | static struct Packet pktin = { 0, 0, 0, NULL, 0 }; |
96 | static struct Packet pktout = { 0, 0, 0, NULL, 0 }; |
97 | |
98 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt); |
99 | static void ssh_size(void); |
100 | |
101 | static void ssh_gotdata(unsigned char *data, int datalen) { |
102 | static long len, biglen, to_read; |
103 | static unsigned char c, *p; |
104 | static int i, pad; |
105 | static char padding[8]; |
106 | static unsigned char word[4]; |
107 | |
108 | crBegin; |
109 | while (1) { |
110 | for (i = len = 0; i < 4; i++) { |
111 | while (datalen == 0) |
112 | crReturnV; |
113 | len = (len << 8) + *data; |
114 | data++, datalen--; |
115 | } |
116 | |
117 | pad = 8 - (len%8); |
118 | |
119 | biglen = len + pad; |
120 | |
121 | len -= 5; /* type and CRC */ |
122 | |
123 | pktin.length = len; |
124 | if (pktin.maxlen < biglen) { |
125 | pktin.maxlen = biglen; |
126 | pktin.data = (pktin.data == NULL ? malloc(biglen) : |
127 | realloc(pktin.data, biglen)); |
128 | if (!pktin.data) |
129 | fatalbox("Out of memory"); |
130 | } |
131 | |
132 | p = pktin.data, to_read = biglen; |
133 | while (to_read > 0) { |
134 | static int chunk; |
135 | chunk = to_read; |
136 | while (datalen == 0) |
137 | crReturnV; |
138 | if (chunk > datalen) |
139 | chunk = datalen; |
140 | memcpy(p, data, chunk); |
141 | data += chunk; |
142 | datalen -= chunk; |
143 | p += chunk; |
144 | to_read -= chunk; |
145 | } |
146 | |
147 | if (cipher) |
148 | cipher->decrypt(pktin.data, biglen); |
149 | |
150 | pktin.type = pktin.data[pad]; |
151 | pktin.body = pktin.data+pad+1; |
152 | |
153 | if (pktin.type == 36) { /* SSH_MSG_DEBUG */ |
154 | /* FIXME: log it */ |
155 | } else |
156 | ssh_protocol(NULL, 0, 1); |
157 | } |
158 | crFinishV; |
159 | } |
160 | |
161 | static void s_wrpkt_start(int type, int len) { |
162 | int pad, biglen; |
163 | |
164 | len += 5; /* type and CRC */ |
165 | pad = 8 - (len%8); |
166 | biglen = len + pad; |
167 | |
168 | pktout.length = len-5; |
169 | if (pktout.maxlen < biglen) { |
170 | pktout.maxlen = biglen; |
171 | pktout.data = (pktout.data == NULL ? malloc(biglen) : |
172 | realloc(pktout.data, biglen)); |
173 | if (!pktout.data) |
174 | fatalbox("Out of memory"); |
175 | } |
176 | |
177 | pktout.type = type; |
178 | pktout.body = pktout.data+4+pad+1; |
179 | } |
180 | |
181 | static void s_wrpkt(void) { |
182 | int pad, len, biglen, i; |
183 | unsigned long crc; |
184 | |
185 | len = pktout.length + 5; /* type and CRC */ |
186 | pad = 8 - (len%8); |
187 | biglen = len + pad; |
188 | |
189 | pktout.body[-1] = pktout.type; |
190 | for (i=0; i<pad; i++) |
191 | pktout.data[i+4] = random_byte(); |
192 | crc = crc32(pktout.data+4, biglen-4); |
193 | |
194 | pktout.data[biglen+0] = (unsigned char) ((crc >> 24) & 0xFF); |
195 | pktout.data[biglen+1] = (unsigned char) ((crc >> 16) & 0xFF); |
196 | pktout.data[biglen+2] = (unsigned char) ((crc >> 8) & 0xFF); |
197 | pktout.data[biglen+3] = (unsigned char) (crc & 0xFF); |
198 | |
199 | pktout.data[0] = (len >> 24) & 0xFF; |
200 | pktout.data[1] = (len >> 16) & 0xFF; |
201 | pktout.data[2] = (len >> 8) & 0xFF; |
202 | pktout.data[3] = len & 0xFF; |
203 | |
204 | if (cipher) |
205 | cipher->encrypt(pktout.data+4, biglen); |
206 | |
207 | s_write(pktout.data, biglen+4); |
208 | } |
209 | |
210 | static int do_ssh_init(void) { |
211 | char c; |
212 | char version[10]; |
213 | char vstring[40]; |
214 | int i; |
215 | |
216 | #ifdef FWHACK |
217 | i = 0; |
218 | while (s_read(&c, 1) == 1) { |
219 | if (c == 'S' && i < 2) i++; |
220 | else if (c == 'S' && i == 2) i = 2; |
221 | else if (c == 'H' && i == 2) break; |
222 | else i = 0; |
223 | } |
224 | #else |
225 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
226 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
227 | if (s_read(&c,1) != 1 || c != 'H') return 0; |
228 | #endif |
229 | if (s_read(&c,1) != 1 || c != '-') return 0; |
230 | i = 0; |
231 | while (1) { |
232 | if (s_read(&c,1) != 1) |
233 | return 0; |
234 | if (i >= 0) { |
235 | if (c == '-') { |
236 | version[i] = '\0'; |
237 | i = -1; |
238 | } else if (i < sizeof(version)-1) |
239 | version[i++] = c; |
240 | } |
241 | else if (c == '\n') |
242 | break; |
243 | } |
244 | |
245 | sprintf(vstring, "SSH-%s-7.7.7\n", |
246 | (strcmp(version, "1.5") <= 0 ? version : "1.5")); |
247 | s_write(vstring, strlen(vstring)); |
248 | } |
249 | |
250 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt) { |
251 | int i, j, len; |
252 | unsigned char session_id[16]; |
253 | unsigned char *rsabuf, *keystr1, *keystr2; |
254 | unsigned char cookie[8]; |
255 | struct RSAKey servkey, hostkey; |
256 | struct MD5Context md5c; |
257 | |
258 | extern struct ssh_cipher ssh_3des; |
259 | |
260 | crBegin; |
261 | |
262 | random_init(); |
263 | |
264 | while (!ispkt) |
265 | crReturnV; |
266 | |
267 | if (pktin.type != 2) |
268 | fatalbox("Public key packet not received"); |
269 | |
270 | memcpy(cookie, pktin.body, 8); |
271 | |
272 | MD5Init(&md5c); |
273 | |
274 | i = makekey(pktin.body+8, &servkey, &keystr1); |
275 | |
276 | j = makekey(pktin.body+8+i, &hostkey, &keystr2); |
277 | |
278 | MD5Update(&md5c, keystr2, hostkey.bytes); |
279 | MD5Update(&md5c, keystr1, servkey.bytes); |
280 | MD5Update(&md5c, pktin.body, 8); |
281 | |
282 | MD5Final(session_id, &md5c); |
283 | |
284 | for (i=0; i<32; i++) |
285 | session_key[i] = random_byte(); |
286 | |
287 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
288 | |
289 | rsabuf = malloc(len); |
290 | if (!rsabuf) |
291 | fatalbox("Out of memory"); |
292 | |
293 | verify_ssh_host_key(savedhost, &hostkey); |
294 | |
295 | for (i=0; i<32; i++) { |
296 | rsabuf[i] = session_key[i]; |
297 | if (i < 16) |
298 | rsabuf[i] ^= session_id[i]; |
299 | } |
300 | |
301 | if (hostkey.bytes > servkey.bytes) { |
302 | rsaencrypt(rsabuf, 32, &servkey); |
303 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
304 | } else { |
305 | rsaencrypt(rsabuf, 32, &hostkey); |
306 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
307 | } |
308 | |
309 | s_wrpkt_start(3, len+15); |
310 | pktout.body[0] = 3; /* SSH_CIPHER_3DES */ |
311 | memcpy(pktout.body+1, cookie, 8); |
312 | pktout.body[9] = (len*8) >> 8; |
313 | pktout.body[10] = (len*8) & 0xFF; |
314 | memcpy(pktout.body+11, rsabuf, len); |
315 | pktout.body[len+11] = pktout.body[len+12] = 0; /* protocol flags */ |
316 | pktout.body[len+13] = pktout.body[len+14] = 0; |
317 | s_wrpkt(); |
318 | |
319 | free(rsabuf); |
320 | |
321 | cipher = &ssh_3des; |
322 | cipher->sesskey(session_key); |
323 | |
324 | do { crReturnV; } while (!ispkt); |
325 | |
326 | if (pktin.type != 14) |
327 | fatalbox("Encryption not successfully enabled"); |
328 | |
329 | fflush(stdout); |
330 | { |
331 | static char username[100]; |
332 | static int pos = 0; |
333 | static char c; |
334 | if (!*cfg.username) { |
335 | c_write("login as: ", 10); |
336 | while (pos >= 0) { |
337 | do { crReturnV; } while (ispkt); |
338 | while (inlen--) switch (c = *in++) { |
339 | case 10: case 13: |
340 | username[pos] = 0; |
341 | pos = -1; |
342 | break; |
343 | case 8: case 127: |
344 | if (pos > 0) { |
345 | c_write("\b \b", 3); |
346 | pos--; |
347 | } |
348 | break; |
349 | case 21: case 27: |
350 | while (pos > 0) { |
351 | c_write("\b \b", 3); |
352 | pos--; |
353 | } |
354 | break; |
355 | case 3: case 4: |
356 | random_save_seed(); |
357 | exit(0); |
358 | break; |
359 | default: |
360 | if (c >= ' ' && c <= '~' && pos < 40) { |
361 | username[pos++] = c; |
362 | c_write(&c, 1); |
363 | } |
364 | break; |
365 | } |
366 | } |
367 | c_write("\r\n", 2); |
368 | username[strcspn(username, "\n\r")] = '\0'; |
369 | } else { |
370 | char stuff[200]; |
371 | strncpy(username, cfg.username, 99); |
372 | username[99] = '\0'; |
373 | sprintf(stuff, "Sent username \"%s\".\r\n", username); |
374 | c_write(stuff, strlen(stuff)); |
375 | } |
376 | s_wrpkt_start(4, 4+strlen(username)); |
377 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
378 | pktout.body[3] = strlen(username); |
379 | memcpy(pktout.body+4, username, strlen(username)); |
380 | s_wrpkt(); |
381 | } |
382 | |
383 | do { crReturnV; } while (!ispkt); |
384 | |
385 | while (pktin.type == 15) { |
386 | static char password[100]; |
387 | static int pos; |
388 | static char c; |
389 | c_write("password: ", 10); |
390 | pos = 0; |
391 | while (pos >= 0) { |
392 | do { crReturnV; } while (ispkt); |
393 | while (inlen--) switch (c = *in++) { |
394 | case 10: case 13: |
395 | password[pos] = 0; |
396 | pos = -1; |
397 | break; |
398 | case 8: case 127: |
399 | if (pos > 0) |
400 | pos--; |
401 | break; |
402 | case 21: case 27: |
403 | pos = 0; |
404 | break; |
405 | case 3: case 4: |
406 | random_save_seed(); |
407 | exit(0); |
408 | break; |
409 | default: |
410 | if (c >= ' ' && c <= '~' && pos < 40) |
411 | password[pos++] = c; |
412 | break; |
413 | } |
414 | } |
415 | c_write("\r\n", 2); |
416 | s_wrpkt_start(9, 4+strlen(password)); |
417 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
418 | pktout.body[3] = strlen(password); |
419 | memcpy(pktout.body+4, password, strlen(password)); |
420 | s_wrpkt(); |
421 | memset(password, 0, strlen(password)); |
422 | do { crReturnV; } while (!ispkt); |
423 | if (pktin.type == 15) { |
424 | c_write("Access denied\r\n", 15); |
425 | } else if (pktin.type != 14) { |
426 | fatalbox("Strange packet received, type %d", pktin.type); |
427 | } |
428 | } |
429 | |
430 | i = strlen(cfg.termtype); |
431 | s_wrpkt_start(10, i+5*4+1); |
432 | pktout.body[0] = (i >> 24) & 0xFF; |
433 | pktout.body[1] = (i >> 16) & 0xFF; |
434 | pktout.body[2] = (i >> 8) & 0xFF; |
435 | pktout.body[3] = i & 0xFF; |
436 | memcpy(pktout.body+4, cfg.termtype, i); |
437 | i += 4; |
438 | pktout.body[i++] = (rows >> 24) & 0xFF; |
439 | pktout.body[i++] = (rows >> 16) & 0xFF; |
440 | pktout.body[i++] = (rows >> 8) & 0xFF; |
441 | pktout.body[i++] = rows & 0xFF; |
442 | pktout.body[i++] = (cols >> 24) & 0xFF; |
443 | pktout.body[i++] = (cols >> 16) & 0xFF; |
444 | pktout.body[i++] = (cols >> 8) & 0xFF; |
445 | pktout.body[i++] = cols & 0xFF; |
446 | memset(pktout.body+i, 0, 9); /* 0 pixwidth, 0 pixheight, 0.b endofopt */ |
447 | s_wrpkt(); |
448 | ssh_state = SSH_STATE_INTERMED; |
449 | do { crReturnV; } while (!ispkt); |
450 | if (pktin.type != 14 && pktin.type != 15) { |
451 | fatalbox("Protocol confusion"); |
452 | } else if (pktin.type == 15) { |
453 | c_write("Server refused to allocate pty\r\n", 32); |
454 | } |
455 | |
456 | s_wrpkt_start(12, 0); |
457 | s_wrpkt(); |
458 | |
459 | ssh_state = SSH_STATE_SESSION; |
460 | if (size_needed) |
461 | ssh_size(); |
462 | |
463 | while (1) { |
464 | crReturnV; |
465 | if (ispkt) { |
466 | if (pktin.type == 17 || pktin.type == 18) { |
467 | long len = 0; |
468 | for (i = 0; i < 4; i++) |
469 | len = (len << 8) + pktin.body[i]; |
470 | c_write(pktin.body+4, len); |
471 | } else if (pktin.type == 1) { |
472 | /* SSH_MSG_DISCONNECT: do nothing */ |
473 | } else if (pktin.type == 14) { |
474 | /* SSH_MSG_SUCCESS: may be from EXEC_SHELL on some servers */ |
475 | } else if (pktin.type == 15) { |
476 | /* SSH_MSG_FAILURE: may be from EXEC_SHELL on some servers |
477 | * if no pty is available or in other odd cases. Ignore */ |
478 | } else if (pktin.type == 20) { |
479 | /* EXITSTATUS */ |
480 | s_wrpkt_start(33, 0); |
481 | s_wrpkt(); |
482 | } else { |
483 | fatalbox("Strange packet received: type %d", pktin.type); |
484 | } |
485 | } else { |
486 | s_wrpkt_start(16, 4+inlen); |
487 | pktout.body[0] = (inlen >> 24) & 0xFF; |
488 | pktout.body[1] = (inlen >> 16) & 0xFF; |
489 | pktout.body[2] = (inlen >> 8) & 0xFF; |
490 | pktout.body[3] = inlen & 0xFF; |
491 | memcpy(pktout.body+4, in, inlen); |
492 | s_wrpkt(); |
493 | } |
494 | } |
495 | |
496 | crFinishV; |
497 | } |
498 | |
499 | /* |
500 | * Called to set up the connection. Will arrange for WM_NETEVENT |
501 | * messages to be passed to the specified window, whose window |
502 | * procedure should then call telnet_msg(). |
503 | * |
504 | * Returns an error message, or NULL on success. |
505 | * |
506 | * Also places the canonical host name into `realhost'. |
507 | */ |
508 | static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) { |
509 | SOCKADDR_IN addr; |
510 | struct hostent *h; |
511 | unsigned long a; |
512 | #ifdef FWHACK |
513 | char *FWhost; |
514 | int FWport; |
515 | #endif |
516 | |
517 | savedhost = malloc(1+strlen(host)); |
518 | if (!savedhost) |
519 | fatalbox("Out of memory"); |
520 | strcpy(savedhost, host); |
521 | |
522 | #ifdef FWHACK |
523 | FWhost = host; |
524 | FWport = port; |
525 | host = FWSTR; |
526 | port = 23; |
527 | #endif |
528 | |
529 | /* |
530 | * Try to find host. |
531 | */ |
532 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
533 | if ( (h = gethostbyname(host)) == NULL) |
534 | switch (WSAGetLastError()) { |
535 | case WSAENETDOWN: return "Network is down"; |
536 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
537 | return "Host does not exist"; |
538 | case WSATRY_AGAIN: return "Host not found"; |
539 | default: return "gethostbyname: unknown error"; |
540 | } |
541 | memcpy (&a, h->h_addr, sizeof(a)); |
542 | *realhost = h->h_name; |
543 | } else |
544 | *realhost = host; |
545 | #ifdef FWHACK |
546 | *realhost = FWhost; |
547 | #endif |
548 | a = ntohl(a); |
549 | |
550 | if (port < 0) |
551 | port = 22; /* default ssh port */ |
552 | |
553 | /* |
554 | * Open socket. |
555 | */ |
556 | s = socket(AF_INET, SOCK_STREAM, 0); |
557 | if (s == INVALID_SOCKET) |
558 | switch (WSAGetLastError()) { |
559 | case WSAENETDOWN: return "Network is down"; |
560 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
561 | default: return "socket(): unknown error"; |
562 | } |
563 | |
564 | /* |
565 | * Bind to local address. |
566 | */ |
567 | addr.sin_family = AF_INET; |
568 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
569 | addr.sin_port = htons(0); |
570 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
571 | switch (WSAGetLastError()) { |
572 | case WSAENETDOWN: return "Network is down"; |
573 | default: return "bind(): unknown error"; |
574 | } |
575 | |
576 | /* |
577 | * Connect to remote address. |
578 | */ |
579 | addr.sin_addr.s_addr = htonl(a); |
580 | addr.sin_port = htons((short)port); |
581 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
582 | switch (WSAGetLastError()) { |
583 | case WSAENETDOWN: return "Network is down"; |
584 | case WSAECONNREFUSED: return "Connection refused"; |
585 | case WSAENETUNREACH: return "Network is unreachable"; |
586 | case WSAEHOSTUNREACH: return "No route to host"; |
587 | default: return "connect(): unknown error"; |
588 | } |
589 | |
590 | #ifdef FWHACK |
591 | send(s, "connect ", 8, 0); |
592 | send(s, FWhost, strlen(FWhost), 0); |
593 | { |
594 | char buf[20]; |
595 | sprintf(buf, " %d\n", FWport); |
596 | send (s, buf, strlen(buf), 0); |
597 | } |
598 | #endif |
599 | |
600 | if (!do_ssh_init()) |
601 | return "Protocol initialisation error"; |
602 | |
603 | if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR) |
604 | switch (WSAGetLastError()) { |
605 | case WSAENETDOWN: return "Network is down"; |
606 | default: return "WSAAsyncSelect(): unknown error"; |
607 | } |
608 | |
609 | return NULL; |
610 | } |
611 | |
612 | /* |
613 | * Process a WM_NETEVENT message. Will return 0 if the connection |
614 | * has closed, or <0 for a socket error. |
615 | */ |
616 | static int ssh_msg (WPARAM wParam, LPARAM lParam) { |
617 | int ret; |
618 | char buf[256]; |
619 | |
620 | if (s == INVALID_SOCKET) /* how the hell did we get here?! */ |
621 | return -5000; |
622 | |
623 | if (WSAGETSELECTERROR(lParam) != 0) |
624 | return -WSAGETSELECTERROR(lParam); |
625 | |
626 | switch (WSAGETSELECTEVENT(lParam)) { |
627 | case FD_READ: |
628 | ret = recv(s, buf, sizeof(buf), 0); |
629 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
630 | return 1; |
631 | if (ret < 0) /* any _other_ error */ |
632 | return -10000-WSAGetLastError(); |
633 | if (ret == 0) { |
634 | s = INVALID_SOCKET; |
635 | return 0; /* can't happen, in theory */ |
636 | } |
637 | ssh_gotdata (buf, ret); |
638 | return 1; |
639 | case FD_CLOSE: |
640 | s = INVALID_SOCKET; |
641 | return 0; |
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 ssh_send (char *buf, int len) { |
650 | if (s == INVALID_SOCKET) |
651 | return; |
652 | |
653 | ssh_protocol(buf, len, 0); |
654 | } |
655 | |
656 | /* |
657 | * Called to set the size of the window from Telnet's POV. |
658 | */ |
659 | static void ssh_size(void) { |
660 | switch (ssh_state) { |
661 | case SSH_STATE_BEFORE_SIZE: |
662 | break; /* do nothing */ |
663 | case SSH_STATE_INTERMED: |
664 | size_needed = TRUE; /* buffer for later */ |
665 | break; |
666 | case SSH_STATE_SESSION: |
667 | s_wrpkt_start(11, 16); |
668 | pktout.body[0] = (rows >> 24) & 0xFF; |
669 | pktout.body[1] = (rows >> 16) & 0xFF; |
670 | pktout.body[2] = (rows >> 8) & 0xFF; |
671 | pktout.body[3] = rows & 0xFF; |
672 | pktout.body[4] = (cols >> 24) & 0xFF; |
673 | pktout.body[5] = (cols >> 16) & 0xFF; |
674 | pktout.body[6] = (cols >> 8) & 0xFF; |
675 | pktout.body[7] = cols & 0xFF; |
676 | memset(pktout.body+8, 0, 8); |
677 | s_wrpkt(); |
678 | } |
679 | } |
680 | |
681 | /* |
682 | * (Send Telnet special codes) |
683 | */ |
684 | static void ssh_special (Telnet_Special code) { |
685 | /* do nothing */ |
686 | } |
687 | |
688 | Backend ssh_backend = { |
689 | ssh_init, |
690 | ssh_msg, |
691 | ssh_send, |
692 | ssh_size, |
693 | ssh_special |
694 | }; |