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, |
21248260 |
50 | SSH_STATE_SESSION, |
51 | SSH_STATE_CLOSED |
374330e2 |
52 | } ssh_state = SSH_STATE_BEFORE_SIZE; |
53 | |
54 | static int size_needed = FALSE; |
55 | |
56 | static void s_write (char *buf, int len) { |
57 | while (len > 0) { |
58 | int i = send (s, buf, len, 0); |
59 | if (i > 0) |
60 | len -= i, buf += i; |
61 | } |
62 | } |
63 | |
64 | static int s_read (char *buf, int len) { |
65 | int ret = 0; |
66 | while (len > 0) { |
67 | int i = recv (s, buf, len, 0); |
68 | if (i > 0) |
69 | len -= i, buf += i, ret += i; |
70 | else |
71 | return i; |
72 | } |
73 | return ret; |
74 | } |
75 | |
76 | static void c_write (char *buf, int len) { |
77 | while (len--) { |
78 | int new_head = (inbuf_head + 1) & INBUF_MASK; |
374330e2 |
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; |
f67b4e85 |
103 | static unsigned char *p; |
374330e2 |
104 | static int i, pad; |
374330e2 |
105 | |
106 | crBegin; |
107 | while (1) { |
108 | for (i = len = 0; i < 4; i++) { |
109 | while (datalen == 0) |
110 | crReturnV; |
111 | len = (len << 8) + *data; |
112 | data++, datalen--; |
113 | } |
114 | |
37508af4 |
115 | #ifdef FWHACK |
116 | if (len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
117 | len = 0x300; /* big enough to carry to end */ |
118 | } |
119 | #endif |
120 | |
374330e2 |
121 | pad = 8 - (len%8); |
122 | |
123 | biglen = len + pad; |
124 | |
125 | len -= 5; /* type and CRC */ |
126 | |
127 | pktin.length = len; |
128 | if (pktin.maxlen < biglen) { |
129 | pktin.maxlen = biglen; |
130 | pktin.data = (pktin.data == NULL ? malloc(biglen) : |
131 | realloc(pktin.data, biglen)); |
132 | if (!pktin.data) |
133 | fatalbox("Out of memory"); |
134 | } |
135 | |
136 | p = pktin.data, to_read = biglen; |
137 | while (to_read > 0) { |
138 | static int chunk; |
139 | chunk = to_read; |
140 | while (datalen == 0) |
141 | crReturnV; |
142 | if (chunk > datalen) |
143 | chunk = datalen; |
144 | memcpy(p, data, chunk); |
145 | data += chunk; |
146 | datalen -= chunk; |
147 | p += chunk; |
148 | to_read -= chunk; |
149 | } |
150 | |
151 | if (cipher) |
152 | cipher->decrypt(pktin.data, biglen); |
153 | |
154 | pktin.type = pktin.data[pad]; |
155 | pktin.body = pktin.data+pad+1; |
156 | |
157 | if (pktin.type == 36) { /* SSH_MSG_DEBUG */ |
158 | /* FIXME: log it */ |
159 | } else |
160 | ssh_protocol(NULL, 0, 1); |
161 | } |
162 | crFinishV; |
163 | } |
164 | |
165 | static void s_wrpkt_start(int type, int len) { |
166 | int pad, biglen; |
167 | |
168 | len += 5; /* type and CRC */ |
169 | pad = 8 - (len%8); |
170 | biglen = len + pad; |
171 | |
172 | pktout.length = len-5; |
173 | if (pktout.maxlen < biglen) { |
174 | pktout.maxlen = biglen; |
c1f5f956 |
175 | pktout.data = (pktout.data == NULL ? malloc(biglen+4) : |
176 | realloc(pktout.data, biglen+4)); |
374330e2 |
177 | if (!pktout.data) |
178 | fatalbox("Out of memory"); |
179 | } |
180 | |
181 | pktout.type = type; |
182 | pktout.body = pktout.data+4+pad+1; |
183 | } |
184 | |
185 | static void s_wrpkt(void) { |
186 | int pad, len, biglen, i; |
187 | unsigned long crc; |
188 | |
189 | len = pktout.length + 5; /* type and CRC */ |
190 | pad = 8 - (len%8); |
191 | biglen = len + pad; |
192 | |
193 | pktout.body[-1] = pktout.type; |
194 | for (i=0; i<pad; i++) |
195 | pktout.data[i+4] = random_byte(); |
196 | crc = crc32(pktout.data+4, biglen-4); |
197 | |
198 | pktout.data[biglen+0] = (unsigned char) ((crc >> 24) & 0xFF); |
199 | pktout.data[biglen+1] = (unsigned char) ((crc >> 16) & 0xFF); |
200 | pktout.data[biglen+2] = (unsigned char) ((crc >> 8) & 0xFF); |
201 | pktout.data[biglen+3] = (unsigned char) (crc & 0xFF); |
202 | |
203 | pktout.data[0] = (len >> 24) & 0xFF; |
204 | pktout.data[1] = (len >> 16) & 0xFF; |
205 | pktout.data[2] = (len >> 8) & 0xFF; |
206 | pktout.data[3] = len & 0xFF; |
207 | |
208 | if (cipher) |
209 | cipher->encrypt(pktout.data+4, biglen); |
210 | |
211 | s_write(pktout.data, biglen+4); |
212 | } |
213 | |
214 | static int do_ssh_init(void) { |
215 | char c; |
216 | char version[10]; |
217 | char vstring[40]; |
218 | int i; |
219 | |
220 | #ifdef FWHACK |
221 | i = 0; |
222 | while (s_read(&c, 1) == 1) { |
223 | if (c == 'S' && i < 2) i++; |
224 | else if (c == 'S' && i == 2) i = 2; |
225 | else if (c == 'H' && i == 2) break; |
226 | else i = 0; |
227 | } |
228 | #else |
229 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
230 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
231 | if (s_read(&c,1) != 1 || c != 'H') return 0; |
232 | #endif |
233 | if (s_read(&c,1) != 1 || c != '-') return 0; |
234 | i = 0; |
235 | while (1) { |
236 | if (s_read(&c,1) != 1) |
237 | return 0; |
238 | if (i >= 0) { |
239 | if (c == '-') { |
240 | version[i] = '\0'; |
241 | i = -1; |
242 | } else if (i < sizeof(version)-1) |
243 | version[i++] = c; |
244 | } |
245 | else if (c == '\n') |
246 | break; |
247 | } |
248 | |
249 | sprintf(vstring, "SSH-%s-7.7.7\n", |
250 | (strcmp(version, "1.5") <= 0 ? version : "1.5")); |
251 | s_write(vstring, strlen(vstring)); |
fef97f43 |
252 | return 1; |
374330e2 |
253 | } |
254 | |
255 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt) { |
256 | int i, j, len; |
257 | unsigned char session_id[16]; |
258 | unsigned char *rsabuf, *keystr1, *keystr2; |
259 | unsigned char cookie[8]; |
260 | struct RSAKey servkey, hostkey; |
261 | struct MD5Context md5c; |
bea1ef5f |
262 | unsigned long supported_ciphers_mask; |
263 | int cipher_type; |
374330e2 |
264 | |
265 | extern struct ssh_cipher ssh_3des; |
bea1ef5f |
266 | extern struct ssh_cipher ssh_blowfish; |
374330e2 |
267 | |
268 | crBegin; |
269 | |
270 | random_init(); |
271 | |
272 | while (!ispkt) |
273 | crReturnV; |
274 | |
275 | if (pktin.type != 2) |
276 | fatalbox("Public key packet not received"); |
277 | |
278 | memcpy(cookie, pktin.body, 8); |
279 | |
280 | MD5Init(&md5c); |
281 | |
282 | i = makekey(pktin.body+8, &servkey, &keystr1); |
283 | |
284 | j = makekey(pktin.body+8+i, &hostkey, &keystr2); |
285 | |
bea1ef5f |
286 | supported_ciphers_mask = (pktin.body[12+i+j] << 24) | |
287 | (pktin.body[13+i+j] << 16) | |
288 | (pktin.body[14+i+j] << 8) | |
289 | (pktin.body[15+i+j]); |
290 | |
374330e2 |
291 | MD5Update(&md5c, keystr2, hostkey.bytes); |
292 | MD5Update(&md5c, keystr1, servkey.bytes); |
293 | MD5Update(&md5c, pktin.body, 8); |
294 | |
295 | MD5Final(session_id, &md5c); |
296 | |
297 | for (i=0; i<32; i++) |
298 | session_key[i] = random_byte(); |
299 | |
300 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
301 | |
302 | rsabuf = malloc(len); |
303 | if (!rsabuf) |
304 | fatalbox("Out of memory"); |
305 | |
306 | verify_ssh_host_key(savedhost, &hostkey); |
307 | |
308 | for (i=0; i<32; i++) { |
309 | rsabuf[i] = session_key[i]; |
310 | if (i < 16) |
311 | rsabuf[i] ^= session_id[i]; |
312 | } |
313 | |
314 | if (hostkey.bytes > servkey.bytes) { |
315 | rsaencrypt(rsabuf, 32, &servkey); |
316 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
317 | } else { |
318 | rsaencrypt(rsabuf, 32, &hostkey); |
319 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
320 | } |
321 | |
bea1ef5f |
322 | cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH : |
323 | SSH_CIPHER_3DES; |
324 | if ((supported_ciphers_mask & (1 << cipher_type)) == 0) { |
325 | c_write("Selected cipher not supported, falling back to 3DES\r\n", 53); |
326 | cipher_type = SSH_CIPHER_3DES; |
327 | } |
328 | |
374330e2 |
329 | s_wrpkt_start(3, len+15); |
bea1ef5f |
330 | pktout.body[0] = cipher_type; |
374330e2 |
331 | memcpy(pktout.body+1, cookie, 8); |
332 | pktout.body[9] = (len*8) >> 8; |
333 | pktout.body[10] = (len*8) & 0xFF; |
334 | memcpy(pktout.body+11, rsabuf, len); |
335 | pktout.body[len+11] = pktout.body[len+12] = 0; /* protocol flags */ |
336 | pktout.body[len+13] = pktout.body[len+14] = 0; |
337 | s_wrpkt(); |
338 | |
339 | free(rsabuf); |
340 | |
bea1ef5f |
341 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish : |
342 | &ssh_3des; |
374330e2 |
343 | cipher->sesskey(session_key); |
344 | |
345 | do { crReturnV; } while (!ispkt); |
346 | |
347 | if (pktin.type != 14) |
348 | fatalbox("Encryption not successfully enabled"); |
349 | |
350 | fflush(stdout); |
351 | { |
352 | static char username[100]; |
353 | static int pos = 0; |
354 | static char c; |
355 | if (!*cfg.username) { |
356 | c_write("login as: ", 10); |
357 | while (pos >= 0) { |
358 | do { crReturnV; } while (ispkt); |
359 | while (inlen--) switch (c = *in++) { |
360 | case 10: case 13: |
361 | username[pos] = 0; |
362 | pos = -1; |
363 | break; |
364 | case 8: case 127: |
365 | if (pos > 0) { |
366 | c_write("\b \b", 3); |
367 | pos--; |
368 | } |
369 | break; |
370 | case 21: case 27: |
371 | while (pos > 0) { |
372 | c_write("\b \b", 3); |
373 | pos--; |
374 | } |
375 | break; |
376 | case 3: case 4: |
377 | random_save_seed(); |
378 | exit(0); |
379 | break; |
380 | default: |
381 | if (c >= ' ' && c <= '~' && pos < 40) { |
382 | username[pos++] = c; |
383 | c_write(&c, 1); |
384 | } |
385 | break; |
386 | } |
387 | } |
388 | c_write("\r\n", 2); |
389 | username[strcspn(username, "\n\r")] = '\0'; |
390 | } else { |
391 | char stuff[200]; |
392 | strncpy(username, cfg.username, 99); |
393 | username[99] = '\0'; |
394 | sprintf(stuff, "Sent username \"%s\".\r\n", username); |
395 | c_write(stuff, strlen(stuff)); |
396 | } |
397 | s_wrpkt_start(4, 4+strlen(username)); |
398 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
399 | pktout.body[3] = strlen(username); |
400 | memcpy(pktout.body+4, username, strlen(username)); |
401 | s_wrpkt(); |
402 | } |
403 | |
404 | do { crReturnV; } while (!ispkt); |
405 | |
406 | while (pktin.type == 15) { |
407 | static char password[100]; |
408 | static int pos; |
409 | static char c; |
410 | c_write("password: ", 10); |
411 | pos = 0; |
412 | while (pos >= 0) { |
413 | do { crReturnV; } while (ispkt); |
414 | while (inlen--) switch (c = *in++) { |
415 | case 10: case 13: |
416 | password[pos] = 0; |
417 | pos = -1; |
418 | break; |
419 | case 8: case 127: |
420 | if (pos > 0) |
421 | pos--; |
422 | break; |
423 | case 21: case 27: |
424 | pos = 0; |
425 | break; |
426 | case 3: case 4: |
427 | random_save_seed(); |
428 | exit(0); |
429 | break; |
430 | default: |
431 | if (c >= ' ' && c <= '~' && pos < 40) |
432 | password[pos++] = c; |
433 | break; |
434 | } |
435 | } |
436 | c_write("\r\n", 2); |
437 | s_wrpkt_start(9, 4+strlen(password)); |
438 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
439 | pktout.body[3] = strlen(password); |
440 | memcpy(pktout.body+4, password, strlen(password)); |
441 | s_wrpkt(); |
442 | memset(password, 0, strlen(password)); |
443 | do { crReturnV; } while (!ispkt); |
444 | if (pktin.type == 15) { |
445 | c_write("Access denied\r\n", 15); |
446 | } else if (pktin.type != 14) { |
447 | fatalbox("Strange packet received, type %d", pktin.type); |
448 | } |
449 | } |
450 | |
fef97f43 |
451 | if (!cfg.nopty) { |
452 | i = strlen(cfg.termtype); |
453 | s_wrpkt_start(10, i+5*4+1); |
454 | pktout.body[0] = (i >> 24) & 0xFF; |
455 | pktout.body[1] = (i >> 16) & 0xFF; |
456 | pktout.body[2] = (i >> 8) & 0xFF; |
457 | pktout.body[3] = i & 0xFF; |
458 | memcpy(pktout.body+4, cfg.termtype, i); |
459 | i += 4; |
460 | pktout.body[i++] = (rows >> 24) & 0xFF; |
461 | pktout.body[i++] = (rows >> 16) & 0xFF; |
462 | pktout.body[i++] = (rows >> 8) & 0xFF; |
463 | pktout.body[i++] = rows & 0xFF; |
464 | pktout.body[i++] = (cols >> 24) & 0xFF; |
465 | pktout.body[i++] = (cols >> 16) & 0xFF; |
466 | pktout.body[i++] = (cols >> 8) & 0xFF; |
467 | pktout.body[i++] = cols & 0xFF; |
468 | memset(pktout.body+i, 0, 9); /* 0 pixwidth, 0 pixheight, 0.b endofopt */ |
469 | s_wrpkt(); |
470 | ssh_state = SSH_STATE_INTERMED; |
471 | do { crReturnV; } while (!ispkt); |
472 | if (pktin.type != 14 && pktin.type != 15) { |
473 | fatalbox("Protocol confusion"); |
474 | } else if (pktin.type == 15) { |
475 | c_write("Server refused to allocate pty\r\n", 32); |
476 | } |
374330e2 |
477 | } |
478 | |
479 | s_wrpkt_start(12, 0); |
480 | s_wrpkt(); |
481 | |
482 | ssh_state = SSH_STATE_SESSION; |
483 | if (size_needed) |
484 | ssh_size(); |
485 | |
486 | while (1) { |
487 | crReturnV; |
488 | if (ispkt) { |
489 | if (pktin.type == 17 || pktin.type == 18) { |
490 | long len = 0; |
491 | for (i = 0; i < 4; i++) |
492 | len = (len << 8) + pktin.body[i]; |
493 | c_write(pktin.body+4, len); |
494 | } else if (pktin.type == 1) { |
21248260 |
495 | /* SSH_MSG_DISCONNECT */ |
496 | ssh_state = SSH_STATE_CLOSED; |
374330e2 |
497 | } else if (pktin.type == 14) { |
498 | /* SSH_MSG_SUCCESS: may be from EXEC_SHELL on some servers */ |
499 | } else if (pktin.type == 15) { |
500 | /* SSH_MSG_FAILURE: may be from EXEC_SHELL on some servers |
501 | * if no pty is available or in other odd cases. Ignore */ |
502 | } else if (pktin.type == 20) { |
503 | /* EXITSTATUS */ |
504 | s_wrpkt_start(33, 0); |
505 | s_wrpkt(); |
506 | } else { |
507 | fatalbox("Strange packet received: type %d", pktin.type); |
508 | } |
509 | } else { |
510 | s_wrpkt_start(16, 4+inlen); |
511 | pktout.body[0] = (inlen >> 24) & 0xFF; |
512 | pktout.body[1] = (inlen >> 16) & 0xFF; |
513 | pktout.body[2] = (inlen >> 8) & 0xFF; |
514 | pktout.body[3] = inlen & 0xFF; |
515 | memcpy(pktout.body+4, in, inlen); |
516 | s_wrpkt(); |
517 | } |
518 | } |
519 | |
520 | crFinishV; |
521 | } |
522 | |
523 | /* |
524 | * Called to set up the connection. Will arrange for WM_NETEVENT |
525 | * messages to be passed to the specified window, whose window |
526 | * procedure should then call telnet_msg(). |
527 | * |
528 | * Returns an error message, or NULL on success. |
529 | * |
530 | * Also places the canonical host name into `realhost'. |
531 | */ |
532 | static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) { |
533 | SOCKADDR_IN addr; |
534 | struct hostent *h; |
535 | unsigned long a; |
536 | #ifdef FWHACK |
537 | char *FWhost; |
538 | int FWport; |
539 | #endif |
540 | |
541 | savedhost = malloc(1+strlen(host)); |
542 | if (!savedhost) |
543 | fatalbox("Out of memory"); |
544 | strcpy(savedhost, host); |
545 | |
546 | #ifdef FWHACK |
547 | FWhost = host; |
548 | FWport = port; |
549 | host = FWSTR; |
550 | port = 23; |
551 | #endif |
552 | |
553 | /* |
554 | * Try to find host. |
555 | */ |
556 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
557 | if ( (h = gethostbyname(host)) == NULL) |
558 | switch (WSAGetLastError()) { |
559 | case WSAENETDOWN: return "Network is down"; |
560 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
561 | return "Host does not exist"; |
562 | case WSATRY_AGAIN: return "Host not found"; |
563 | default: return "gethostbyname: unknown error"; |
564 | } |
565 | memcpy (&a, h->h_addr, sizeof(a)); |
566 | *realhost = h->h_name; |
567 | } else |
568 | *realhost = host; |
569 | #ifdef FWHACK |
570 | *realhost = FWhost; |
571 | #endif |
572 | a = ntohl(a); |
573 | |
574 | if (port < 0) |
575 | port = 22; /* default ssh port */ |
576 | |
577 | /* |
578 | * Open socket. |
579 | */ |
580 | s = socket(AF_INET, SOCK_STREAM, 0); |
581 | if (s == INVALID_SOCKET) |
582 | switch (WSAGetLastError()) { |
583 | case WSAENETDOWN: return "Network is down"; |
584 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
585 | default: return "socket(): unknown error"; |
586 | } |
587 | |
588 | /* |
589 | * Bind to local address. |
590 | */ |
591 | addr.sin_family = AF_INET; |
592 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
593 | addr.sin_port = htons(0); |
594 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
595 | switch (WSAGetLastError()) { |
596 | case WSAENETDOWN: return "Network is down"; |
597 | default: return "bind(): unknown error"; |
598 | } |
599 | |
600 | /* |
601 | * Connect to remote address. |
602 | */ |
603 | addr.sin_addr.s_addr = htonl(a); |
604 | addr.sin_port = htons((short)port); |
605 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
606 | switch (WSAGetLastError()) { |
607 | case WSAENETDOWN: return "Network is down"; |
608 | case WSAECONNREFUSED: return "Connection refused"; |
609 | case WSAENETUNREACH: return "Network is unreachable"; |
610 | case WSAEHOSTUNREACH: return "No route to host"; |
611 | default: return "connect(): unknown error"; |
612 | } |
613 | |
614 | #ifdef FWHACK |
615 | send(s, "connect ", 8, 0); |
616 | send(s, FWhost, strlen(FWhost), 0); |
617 | { |
618 | char buf[20]; |
619 | sprintf(buf, " %d\n", FWport); |
620 | send (s, buf, strlen(buf), 0); |
621 | } |
622 | #endif |
623 | |
624 | if (!do_ssh_init()) |
625 | return "Protocol initialisation error"; |
626 | |
627 | if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR) |
628 | switch (WSAGetLastError()) { |
629 | case WSAENETDOWN: return "Network is down"; |
630 | default: return "WSAAsyncSelect(): unknown error"; |
631 | } |
632 | |
633 | return NULL; |
634 | } |
635 | |
636 | /* |
637 | * Process a WM_NETEVENT message. Will return 0 if the connection |
638 | * has closed, or <0 for a socket error. |
639 | */ |
640 | static int ssh_msg (WPARAM wParam, LPARAM lParam) { |
641 | int ret; |
642 | char buf[256]; |
643 | |
644 | if (s == INVALID_SOCKET) /* how the hell did we get here?! */ |
645 | return -5000; |
646 | |
647 | if (WSAGETSELECTERROR(lParam) != 0) |
648 | return -WSAGETSELECTERROR(lParam); |
649 | |
650 | switch (WSAGETSELECTEVENT(lParam)) { |
651 | case FD_READ: |
652 | ret = recv(s, buf, sizeof(buf), 0); |
653 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
654 | return 1; |
655 | if (ret < 0) /* any _other_ error */ |
656 | return -10000-WSAGetLastError(); |
657 | if (ret == 0) { |
658 | s = INVALID_SOCKET; |
659 | return 0; /* can't happen, in theory */ |
660 | } |
661 | ssh_gotdata (buf, ret); |
662 | return 1; |
663 | case FD_CLOSE: |
664 | s = INVALID_SOCKET; |
21248260 |
665 | ssh_state = SSH_STATE_CLOSED; |
374330e2 |
666 | return 0; |
667 | } |
668 | return 1; /* shouldn't happen, but WTF */ |
669 | } |
670 | |
671 | /* |
672 | * Called to send data down the Telnet connection. |
673 | */ |
674 | static void ssh_send (char *buf, int len) { |
675 | if (s == INVALID_SOCKET) |
676 | return; |
677 | |
678 | ssh_protocol(buf, len, 0); |
679 | } |
680 | |
681 | /* |
682 | * Called to set the size of the window from Telnet's POV. |
683 | */ |
684 | static void ssh_size(void) { |
685 | switch (ssh_state) { |
686 | case SSH_STATE_BEFORE_SIZE: |
21248260 |
687 | case SSH_STATE_CLOSED: |
374330e2 |
688 | break; /* do nothing */ |
689 | case SSH_STATE_INTERMED: |
690 | size_needed = TRUE; /* buffer for later */ |
691 | break; |
692 | case SSH_STATE_SESSION: |
fef97f43 |
693 | if (!cfg.nopty) { |
694 | s_wrpkt_start(11, 16); |
695 | pktout.body[0] = (rows >> 24) & 0xFF; |
696 | pktout.body[1] = (rows >> 16) & 0xFF; |
697 | pktout.body[2] = (rows >> 8) & 0xFF; |
698 | pktout.body[3] = rows & 0xFF; |
699 | pktout.body[4] = (cols >> 24) & 0xFF; |
700 | pktout.body[5] = (cols >> 16) & 0xFF; |
701 | pktout.body[6] = (cols >> 8) & 0xFF; |
702 | pktout.body[7] = cols & 0xFF; |
703 | memset(pktout.body+8, 0, 8); |
704 | s_wrpkt(); |
705 | } |
374330e2 |
706 | } |
707 | } |
708 | |
709 | /* |
710 | * (Send Telnet special codes) |
711 | */ |
712 | static void ssh_special (Telnet_Special code) { |
713 | /* do nothing */ |
714 | } |
715 | |
716 | Backend ssh_backend = { |
717 | ssh_init, |
718 | ssh_msg, |
719 | ssh_send, |
720 | ssh_size, |
721 | ssh_special |
722 | }; |