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 | |
37508af4 |
117 | #ifdef FWHACK |
118 | if (len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
119 | len = 0x300; /* big enough to carry to end */ |
120 | } |
121 | #endif |
122 | |
374330e2 |
123 | pad = 8 - (len%8); |
124 | |
125 | biglen = len + pad; |
126 | |
127 | len -= 5; /* type and CRC */ |
128 | |
129 | pktin.length = len; |
130 | if (pktin.maxlen < biglen) { |
131 | pktin.maxlen = biglen; |
132 | pktin.data = (pktin.data == NULL ? malloc(biglen) : |
133 | realloc(pktin.data, biglen)); |
134 | if (!pktin.data) |
135 | fatalbox("Out of memory"); |
136 | } |
137 | |
138 | p = pktin.data, to_read = biglen; |
139 | while (to_read > 0) { |
140 | static int chunk; |
141 | chunk = to_read; |
142 | while (datalen == 0) |
143 | crReturnV; |
144 | if (chunk > datalen) |
145 | chunk = datalen; |
146 | memcpy(p, data, chunk); |
147 | data += chunk; |
148 | datalen -= chunk; |
149 | p += chunk; |
150 | to_read -= chunk; |
151 | } |
152 | |
153 | if (cipher) |
154 | cipher->decrypt(pktin.data, biglen); |
155 | |
156 | pktin.type = pktin.data[pad]; |
157 | pktin.body = pktin.data+pad+1; |
158 | |
159 | if (pktin.type == 36) { /* SSH_MSG_DEBUG */ |
160 | /* FIXME: log it */ |
161 | } else |
162 | ssh_protocol(NULL, 0, 1); |
163 | } |
164 | crFinishV; |
165 | } |
166 | |
167 | static void s_wrpkt_start(int type, int len) { |
168 | int pad, biglen; |
169 | |
170 | len += 5; /* type and CRC */ |
171 | pad = 8 - (len%8); |
172 | biglen = len + pad; |
173 | |
174 | pktout.length = len-5; |
175 | if (pktout.maxlen < biglen) { |
176 | pktout.maxlen = biglen; |
c1f5f956 |
177 | pktout.data = (pktout.data == NULL ? malloc(biglen+4) : |
178 | realloc(pktout.data, biglen+4)); |
374330e2 |
179 | if (!pktout.data) |
180 | fatalbox("Out of memory"); |
181 | } |
182 | |
183 | pktout.type = type; |
184 | pktout.body = pktout.data+4+pad+1; |
185 | } |
186 | |
187 | static void s_wrpkt(void) { |
188 | int pad, len, biglen, i; |
189 | unsigned long crc; |
190 | |
191 | len = pktout.length + 5; /* type and CRC */ |
192 | pad = 8 - (len%8); |
193 | biglen = len + pad; |
194 | |
195 | pktout.body[-1] = pktout.type; |
196 | for (i=0; i<pad; i++) |
197 | pktout.data[i+4] = random_byte(); |
198 | crc = crc32(pktout.data+4, biglen-4); |
199 | |
200 | pktout.data[biglen+0] = (unsigned char) ((crc >> 24) & 0xFF); |
201 | pktout.data[biglen+1] = (unsigned char) ((crc >> 16) & 0xFF); |
202 | pktout.data[biglen+2] = (unsigned char) ((crc >> 8) & 0xFF); |
203 | pktout.data[biglen+3] = (unsigned char) (crc & 0xFF); |
204 | |
205 | pktout.data[0] = (len >> 24) & 0xFF; |
206 | pktout.data[1] = (len >> 16) & 0xFF; |
207 | pktout.data[2] = (len >> 8) & 0xFF; |
208 | pktout.data[3] = len & 0xFF; |
209 | |
210 | if (cipher) |
211 | cipher->encrypt(pktout.data+4, biglen); |
212 | |
213 | s_write(pktout.data, biglen+4); |
214 | } |
215 | |
216 | static int do_ssh_init(void) { |
217 | char c; |
218 | char version[10]; |
219 | char vstring[40]; |
220 | int i; |
221 | |
222 | #ifdef FWHACK |
223 | i = 0; |
224 | while (s_read(&c, 1) == 1) { |
225 | if (c == 'S' && i < 2) i++; |
226 | else if (c == 'S' && i == 2) i = 2; |
227 | else if (c == 'H' && i == 2) break; |
228 | else i = 0; |
229 | } |
230 | #else |
231 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
232 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
233 | if (s_read(&c,1) != 1 || c != 'H') return 0; |
234 | #endif |
235 | if (s_read(&c,1) != 1 || c != '-') return 0; |
236 | i = 0; |
237 | while (1) { |
238 | if (s_read(&c,1) != 1) |
239 | return 0; |
240 | if (i >= 0) { |
241 | if (c == '-') { |
242 | version[i] = '\0'; |
243 | i = -1; |
244 | } else if (i < sizeof(version)-1) |
245 | version[i++] = c; |
246 | } |
247 | else if (c == '\n') |
248 | break; |
249 | } |
250 | |
251 | sprintf(vstring, "SSH-%s-7.7.7\n", |
252 | (strcmp(version, "1.5") <= 0 ? version : "1.5")); |
253 | s_write(vstring, strlen(vstring)); |
fef97f43 |
254 | return 1; |
374330e2 |
255 | } |
256 | |
257 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt) { |
258 | int i, j, len; |
259 | unsigned char session_id[16]; |
260 | unsigned char *rsabuf, *keystr1, *keystr2; |
261 | unsigned char cookie[8]; |
262 | struct RSAKey servkey, hostkey; |
263 | struct MD5Context md5c; |
264 | |
265 | extern struct ssh_cipher ssh_3des; |
266 | |
267 | crBegin; |
268 | |
269 | random_init(); |
270 | |
271 | while (!ispkt) |
272 | crReturnV; |
273 | |
274 | if (pktin.type != 2) |
275 | fatalbox("Public key packet not received"); |
276 | |
277 | memcpy(cookie, pktin.body, 8); |
278 | |
279 | MD5Init(&md5c); |
280 | |
281 | i = makekey(pktin.body+8, &servkey, &keystr1); |
282 | |
283 | j = makekey(pktin.body+8+i, &hostkey, &keystr2); |
284 | |
285 | MD5Update(&md5c, keystr2, hostkey.bytes); |
286 | MD5Update(&md5c, keystr1, servkey.bytes); |
287 | MD5Update(&md5c, pktin.body, 8); |
288 | |
289 | MD5Final(session_id, &md5c); |
290 | |
291 | for (i=0; i<32; i++) |
292 | session_key[i] = random_byte(); |
293 | |
294 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
295 | |
296 | rsabuf = malloc(len); |
297 | if (!rsabuf) |
298 | fatalbox("Out of memory"); |
299 | |
300 | verify_ssh_host_key(savedhost, &hostkey); |
301 | |
302 | for (i=0; i<32; i++) { |
303 | rsabuf[i] = session_key[i]; |
304 | if (i < 16) |
305 | rsabuf[i] ^= session_id[i]; |
306 | } |
307 | |
308 | if (hostkey.bytes > servkey.bytes) { |
309 | rsaencrypt(rsabuf, 32, &servkey); |
310 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
311 | } else { |
312 | rsaencrypt(rsabuf, 32, &hostkey); |
313 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
314 | } |
315 | |
316 | s_wrpkt_start(3, len+15); |
317 | pktout.body[0] = 3; /* SSH_CIPHER_3DES */ |
318 | memcpy(pktout.body+1, cookie, 8); |
319 | pktout.body[9] = (len*8) >> 8; |
320 | pktout.body[10] = (len*8) & 0xFF; |
321 | memcpy(pktout.body+11, rsabuf, len); |
322 | pktout.body[len+11] = pktout.body[len+12] = 0; /* protocol flags */ |
323 | pktout.body[len+13] = pktout.body[len+14] = 0; |
324 | s_wrpkt(); |
325 | |
326 | free(rsabuf); |
327 | |
328 | cipher = &ssh_3des; |
329 | cipher->sesskey(session_key); |
330 | |
331 | do { crReturnV; } while (!ispkt); |
332 | |
333 | if (pktin.type != 14) |
334 | fatalbox("Encryption not successfully enabled"); |
335 | |
336 | fflush(stdout); |
337 | { |
338 | static char username[100]; |
339 | static int pos = 0; |
340 | static char c; |
341 | if (!*cfg.username) { |
342 | c_write("login as: ", 10); |
343 | while (pos >= 0) { |
344 | do { crReturnV; } while (ispkt); |
345 | while (inlen--) switch (c = *in++) { |
346 | case 10: case 13: |
347 | username[pos] = 0; |
348 | pos = -1; |
349 | break; |
350 | case 8: case 127: |
351 | if (pos > 0) { |
352 | c_write("\b \b", 3); |
353 | pos--; |
354 | } |
355 | break; |
356 | case 21: case 27: |
357 | while (pos > 0) { |
358 | c_write("\b \b", 3); |
359 | pos--; |
360 | } |
361 | break; |
362 | case 3: case 4: |
363 | random_save_seed(); |
364 | exit(0); |
365 | break; |
366 | default: |
367 | if (c >= ' ' && c <= '~' && pos < 40) { |
368 | username[pos++] = c; |
369 | c_write(&c, 1); |
370 | } |
371 | break; |
372 | } |
373 | } |
374 | c_write("\r\n", 2); |
375 | username[strcspn(username, "\n\r")] = '\0'; |
376 | } else { |
377 | char stuff[200]; |
378 | strncpy(username, cfg.username, 99); |
379 | username[99] = '\0'; |
380 | sprintf(stuff, "Sent username \"%s\".\r\n", username); |
381 | c_write(stuff, strlen(stuff)); |
382 | } |
383 | s_wrpkt_start(4, 4+strlen(username)); |
384 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
385 | pktout.body[3] = strlen(username); |
386 | memcpy(pktout.body+4, username, strlen(username)); |
387 | s_wrpkt(); |
388 | } |
389 | |
390 | do { crReturnV; } while (!ispkt); |
391 | |
392 | while (pktin.type == 15) { |
393 | static char password[100]; |
394 | static int pos; |
395 | static char c; |
396 | c_write("password: ", 10); |
397 | pos = 0; |
398 | while (pos >= 0) { |
399 | do { crReturnV; } while (ispkt); |
400 | while (inlen--) switch (c = *in++) { |
401 | case 10: case 13: |
402 | password[pos] = 0; |
403 | pos = -1; |
404 | break; |
405 | case 8: case 127: |
406 | if (pos > 0) |
407 | pos--; |
408 | break; |
409 | case 21: case 27: |
410 | pos = 0; |
411 | break; |
412 | case 3: case 4: |
413 | random_save_seed(); |
414 | exit(0); |
415 | break; |
416 | default: |
417 | if (c >= ' ' && c <= '~' && pos < 40) |
418 | password[pos++] = c; |
419 | break; |
420 | } |
421 | } |
422 | c_write("\r\n", 2); |
423 | s_wrpkt_start(9, 4+strlen(password)); |
424 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
425 | pktout.body[3] = strlen(password); |
426 | memcpy(pktout.body+4, password, strlen(password)); |
427 | s_wrpkt(); |
428 | memset(password, 0, strlen(password)); |
429 | do { crReturnV; } while (!ispkt); |
430 | if (pktin.type == 15) { |
431 | c_write("Access denied\r\n", 15); |
432 | } else if (pktin.type != 14) { |
433 | fatalbox("Strange packet received, type %d", pktin.type); |
434 | } |
435 | } |
436 | |
fef97f43 |
437 | if (!cfg.nopty) { |
438 | i = strlen(cfg.termtype); |
439 | s_wrpkt_start(10, i+5*4+1); |
440 | pktout.body[0] = (i >> 24) & 0xFF; |
441 | pktout.body[1] = (i >> 16) & 0xFF; |
442 | pktout.body[2] = (i >> 8) & 0xFF; |
443 | pktout.body[3] = i & 0xFF; |
444 | memcpy(pktout.body+4, cfg.termtype, i); |
445 | i += 4; |
446 | pktout.body[i++] = (rows >> 24) & 0xFF; |
447 | pktout.body[i++] = (rows >> 16) & 0xFF; |
448 | pktout.body[i++] = (rows >> 8) & 0xFF; |
449 | pktout.body[i++] = rows & 0xFF; |
450 | pktout.body[i++] = (cols >> 24) & 0xFF; |
451 | pktout.body[i++] = (cols >> 16) & 0xFF; |
452 | pktout.body[i++] = (cols >> 8) & 0xFF; |
453 | pktout.body[i++] = cols & 0xFF; |
454 | memset(pktout.body+i, 0, 9); /* 0 pixwidth, 0 pixheight, 0.b endofopt */ |
455 | s_wrpkt(); |
456 | ssh_state = SSH_STATE_INTERMED; |
457 | do { crReturnV; } while (!ispkt); |
458 | if (pktin.type != 14 && pktin.type != 15) { |
459 | fatalbox("Protocol confusion"); |
460 | } else if (pktin.type == 15) { |
461 | c_write("Server refused to allocate pty\r\n", 32); |
462 | } |
374330e2 |
463 | } |
464 | |
465 | s_wrpkt_start(12, 0); |
466 | s_wrpkt(); |
467 | |
468 | ssh_state = SSH_STATE_SESSION; |
469 | if (size_needed) |
470 | ssh_size(); |
471 | |
472 | while (1) { |
473 | crReturnV; |
474 | if (ispkt) { |
475 | if (pktin.type == 17 || pktin.type == 18) { |
476 | long len = 0; |
477 | for (i = 0; i < 4; i++) |
478 | len = (len << 8) + pktin.body[i]; |
479 | c_write(pktin.body+4, len); |
480 | } else if (pktin.type == 1) { |
481 | /* SSH_MSG_DISCONNECT: do nothing */ |
482 | } else if (pktin.type == 14) { |
483 | /* SSH_MSG_SUCCESS: may be from EXEC_SHELL on some servers */ |
484 | } else if (pktin.type == 15) { |
485 | /* SSH_MSG_FAILURE: may be from EXEC_SHELL on some servers |
486 | * if no pty is available or in other odd cases. Ignore */ |
487 | } else if (pktin.type == 20) { |
488 | /* EXITSTATUS */ |
489 | s_wrpkt_start(33, 0); |
490 | s_wrpkt(); |
491 | } else { |
492 | fatalbox("Strange packet received: type %d", pktin.type); |
493 | } |
494 | } else { |
495 | s_wrpkt_start(16, 4+inlen); |
496 | pktout.body[0] = (inlen >> 24) & 0xFF; |
497 | pktout.body[1] = (inlen >> 16) & 0xFF; |
498 | pktout.body[2] = (inlen >> 8) & 0xFF; |
499 | pktout.body[3] = inlen & 0xFF; |
500 | memcpy(pktout.body+4, in, inlen); |
501 | s_wrpkt(); |
502 | } |
503 | } |
504 | |
505 | crFinishV; |
506 | } |
507 | |
508 | /* |
509 | * Called to set up the connection. Will arrange for WM_NETEVENT |
510 | * messages to be passed to the specified window, whose window |
511 | * procedure should then call telnet_msg(). |
512 | * |
513 | * Returns an error message, or NULL on success. |
514 | * |
515 | * Also places the canonical host name into `realhost'. |
516 | */ |
517 | static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) { |
518 | SOCKADDR_IN addr; |
519 | struct hostent *h; |
520 | unsigned long a; |
521 | #ifdef FWHACK |
522 | char *FWhost; |
523 | int FWport; |
524 | #endif |
525 | |
526 | savedhost = malloc(1+strlen(host)); |
527 | if (!savedhost) |
528 | fatalbox("Out of memory"); |
529 | strcpy(savedhost, host); |
530 | |
531 | #ifdef FWHACK |
532 | FWhost = host; |
533 | FWport = port; |
534 | host = FWSTR; |
535 | port = 23; |
536 | #endif |
537 | |
538 | /* |
539 | * Try to find host. |
540 | */ |
541 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
542 | if ( (h = gethostbyname(host)) == NULL) |
543 | switch (WSAGetLastError()) { |
544 | case WSAENETDOWN: return "Network is down"; |
545 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
546 | return "Host does not exist"; |
547 | case WSATRY_AGAIN: return "Host not found"; |
548 | default: return "gethostbyname: unknown error"; |
549 | } |
550 | memcpy (&a, h->h_addr, sizeof(a)); |
551 | *realhost = h->h_name; |
552 | } else |
553 | *realhost = host; |
554 | #ifdef FWHACK |
555 | *realhost = FWhost; |
556 | #endif |
557 | a = ntohl(a); |
558 | |
559 | if (port < 0) |
560 | port = 22; /* default ssh port */ |
561 | |
562 | /* |
563 | * Open socket. |
564 | */ |
565 | s = socket(AF_INET, SOCK_STREAM, 0); |
566 | if (s == INVALID_SOCKET) |
567 | switch (WSAGetLastError()) { |
568 | case WSAENETDOWN: return "Network is down"; |
569 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
570 | default: return "socket(): unknown error"; |
571 | } |
572 | |
573 | /* |
574 | * Bind to local address. |
575 | */ |
576 | addr.sin_family = AF_INET; |
577 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
578 | addr.sin_port = htons(0); |
579 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
580 | switch (WSAGetLastError()) { |
581 | case WSAENETDOWN: return "Network is down"; |
582 | default: return "bind(): unknown error"; |
583 | } |
584 | |
585 | /* |
586 | * Connect to remote address. |
587 | */ |
588 | addr.sin_addr.s_addr = htonl(a); |
589 | addr.sin_port = htons((short)port); |
590 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
591 | switch (WSAGetLastError()) { |
592 | case WSAENETDOWN: return "Network is down"; |
593 | case WSAECONNREFUSED: return "Connection refused"; |
594 | case WSAENETUNREACH: return "Network is unreachable"; |
595 | case WSAEHOSTUNREACH: return "No route to host"; |
596 | default: return "connect(): unknown error"; |
597 | } |
598 | |
599 | #ifdef FWHACK |
600 | send(s, "connect ", 8, 0); |
601 | send(s, FWhost, strlen(FWhost), 0); |
602 | { |
603 | char buf[20]; |
604 | sprintf(buf, " %d\n", FWport); |
605 | send (s, buf, strlen(buf), 0); |
606 | } |
607 | #endif |
608 | |
609 | if (!do_ssh_init()) |
610 | return "Protocol initialisation error"; |
611 | |
612 | if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR) |
613 | switch (WSAGetLastError()) { |
614 | case WSAENETDOWN: return "Network is down"; |
615 | default: return "WSAAsyncSelect(): unknown error"; |
616 | } |
617 | |
618 | return NULL; |
619 | } |
620 | |
621 | /* |
622 | * Process a WM_NETEVENT message. Will return 0 if the connection |
623 | * has closed, or <0 for a socket error. |
624 | */ |
625 | static int ssh_msg (WPARAM wParam, LPARAM lParam) { |
626 | int ret; |
627 | char buf[256]; |
628 | |
629 | if (s == INVALID_SOCKET) /* how the hell did we get here?! */ |
630 | return -5000; |
631 | |
632 | if (WSAGETSELECTERROR(lParam) != 0) |
633 | return -WSAGETSELECTERROR(lParam); |
634 | |
635 | switch (WSAGETSELECTEVENT(lParam)) { |
636 | case FD_READ: |
637 | ret = recv(s, buf, sizeof(buf), 0); |
638 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
639 | return 1; |
640 | if (ret < 0) /* any _other_ error */ |
641 | return -10000-WSAGetLastError(); |
642 | if (ret == 0) { |
643 | s = INVALID_SOCKET; |
644 | return 0; /* can't happen, in theory */ |
645 | } |
646 | ssh_gotdata (buf, ret); |
647 | return 1; |
648 | case FD_CLOSE: |
649 | s = INVALID_SOCKET; |
650 | return 0; |
651 | } |
652 | return 1; /* shouldn't happen, but WTF */ |
653 | } |
654 | |
655 | /* |
656 | * Called to send data down the Telnet connection. |
657 | */ |
658 | static void ssh_send (char *buf, int len) { |
659 | if (s == INVALID_SOCKET) |
660 | return; |
661 | |
662 | ssh_protocol(buf, len, 0); |
663 | } |
664 | |
665 | /* |
666 | * Called to set the size of the window from Telnet's POV. |
667 | */ |
668 | static void ssh_size(void) { |
669 | switch (ssh_state) { |
670 | case SSH_STATE_BEFORE_SIZE: |
671 | break; /* do nothing */ |
672 | case SSH_STATE_INTERMED: |
673 | size_needed = TRUE; /* buffer for later */ |
674 | break; |
675 | case SSH_STATE_SESSION: |
fef97f43 |
676 | if (!cfg.nopty) { |
677 | s_wrpkt_start(11, 16); |
678 | pktout.body[0] = (rows >> 24) & 0xFF; |
679 | pktout.body[1] = (rows >> 16) & 0xFF; |
680 | pktout.body[2] = (rows >> 8) & 0xFF; |
681 | pktout.body[3] = rows & 0xFF; |
682 | pktout.body[4] = (cols >> 24) & 0xFF; |
683 | pktout.body[5] = (cols >> 16) & 0xFF; |
684 | pktout.body[6] = (cols >> 8) & 0xFF; |
685 | pktout.body[7] = cols & 0xFF; |
686 | memset(pktout.body+8, 0, 8); |
687 | s_wrpkt(); |
688 | } |
374330e2 |
689 | } |
690 | } |
691 | |
692 | /* |
693 | * (Send Telnet special codes) |
694 | */ |
695 | static void ssh_special (Telnet_Special code) { |
696 | /* do nothing */ |
697 | } |
698 | |
699 | Backend ssh_backend = { |
700 | ssh_init, |
701 | ssh_msg, |
702 | ssh_send, |
703 | ssh_size, |
704 | ssh_special |
705 | }; |