| 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 | #define SSH_MSG_DISCONNECT 1 |
| 17 | #define SSH_SMSG_PUBLIC_KEY 2 |
| 18 | #define SSH_CMSG_SESSION_KEY 3 |
| 19 | #define SSH_CMSG_USER 4 |
| 20 | #define SSH_CMSG_AUTH_PASSWORD 9 |
| 21 | #define SSH_CMSG_REQUEST_PTY 10 |
| 22 | #define SSH_CMSG_EXEC_SHELL 12 |
| 23 | #define SSH_CMSG_STDIN_DATA 16 |
| 24 | #define SSH_SMSG_STDOUT_DATA 17 |
| 25 | #define SSH_SMSG_STDERR_DATA 18 |
| 26 | #define SSH_SMSG_SUCCESS 14 |
| 27 | #define SSH_SMSG_FAILURE 15 |
| 28 | #define SSH_SMSG_EXITSTATUS 20 |
| 29 | #define SSH_MSG_IGNORE 32 |
| 30 | #define SSH_CMSG_EXIT_CONFIRMATION 33 |
| 31 | #define SSH_MSG_DEBUG 36 |
| 32 | |
| 33 | /* Coroutine mechanics for the sillier bits of the code */ |
| 34 | #define crBegin1 static int crLine = 0; |
| 35 | #define crBegin2 switch(crLine) { case 0:; |
| 36 | #define crBegin crBegin1; crBegin2; |
| 37 | #define crFinish(z) } crLine = 0; return (z) |
| 38 | #define crFinishV } crLine = 0; return |
| 39 | #define crReturn(z) \ |
| 40 | do {\ |
| 41 | crLine=__LINE__; return (z); case __LINE__:;\ |
| 42 | } while (0) |
| 43 | #define crReturnV \ |
| 44 | do {\ |
| 45 | crLine=__LINE__; return; case __LINE__:;\ |
| 46 | } while (0) |
| 47 | #define crStop(z) do{ crLine = 0; return (z); }while(0) |
| 48 | #define crStopV do{ crLine = 0; return; }while(0) |
| 49 | |
| 50 | #ifndef FALSE |
| 51 | #define FALSE 0 |
| 52 | #endif |
| 53 | #ifndef TRUE |
| 54 | #define TRUE 1 |
| 55 | #endif |
| 56 | |
| 57 | static SOCKET s = INVALID_SOCKET; |
| 58 | |
| 59 | static unsigned char session_key[32]; |
| 60 | static struct ssh_cipher *cipher = NULL; |
| 61 | |
| 62 | static char *savedhost; |
| 63 | |
| 64 | static enum { |
| 65 | SSH_STATE_BEFORE_SIZE, |
| 66 | SSH_STATE_INTERMED, |
| 67 | SSH_STATE_SESSION, |
| 68 | SSH_STATE_CLOSED |
| 69 | } ssh_state = SSH_STATE_BEFORE_SIZE; |
| 70 | |
| 71 | static int size_needed = FALSE; |
| 72 | |
| 73 | static void s_write (char *buf, int len) { |
| 74 | while (len > 0) { |
| 75 | int i = send (s, buf, len, 0); |
| 76 | if (i > 0) |
| 77 | len -= i, buf += i; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | static int s_read (char *buf, int len) { |
| 82 | int ret = 0; |
| 83 | while (len > 0) { |
| 84 | int i = recv (s, buf, len, 0); |
| 85 | if (i > 0) |
| 86 | len -= i, buf += i, ret += i; |
| 87 | else |
| 88 | return i; |
| 89 | } |
| 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | static void c_write (char *buf, int len) { |
| 94 | while (len--) { |
| 95 | int new_head = (inbuf_head + 1) & INBUF_MASK; |
| 96 | if (new_head != inbuf_reap) { |
| 97 | inbuf[inbuf_head] = *buf++; |
| 98 | inbuf_head = new_head; |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | struct Packet { |
| 104 | long length; |
| 105 | int type; |
| 106 | unsigned long crc; |
| 107 | unsigned char *data; |
| 108 | unsigned char *body; |
| 109 | long maxlen; |
| 110 | }; |
| 111 | |
| 112 | static struct Packet pktin = { 0, 0, 0, NULL, 0 }; |
| 113 | static struct Packet pktout = { 0, 0, 0, NULL, 0 }; |
| 114 | |
| 115 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt); |
| 116 | static void ssh_size(void); |
| 117 | |
| 118 | static void ssh_gotdata(unsigned char *data, int datalen) { |
| 119 | static long len, biglen, to_read; |
| 120 | static unsigned char *p; |
| 121 | static int i, pad; |
| 122 | |
| 123 | crBegin; |
| 124 | while (1) { |
| 125 | for (i = len = 0; i < 4; i++) { |
| 126 | while (datalen == 0) |
| 127 | crReturnV; |
| 128 | len = (len << 8) + *data; |
| 129 | data++, datalen--; |
| 130 | } |
| 131 | |
| 132 | #ifdef FWHACK |
| 133 | if (len == 0x52656d6f) { /* "Remo"te server has closed ... */ |
| 134 | len = 0x300; /* big enough to carry to end */ |
| 135 | } |
| 136 | #endif |
| 137 | |
| 138 | pad = 8 - (len%8); |
| 139 | |
| 140 | biglen = len + pad; |
| 141 | |
| 142 | len -= 5; /* type and CRC */ |
| 143 | |
| 144 | pktin.length = len; |
| 145 | if (pktin.maxlen < biglen) { |
| 146 | pktin.maxlen = biglen; |
| 147 | pktin.data = (pktin.data == NULL ? malloc(biglen) : |
| 148 | realloc(pktin.data, biglen)); |
| 149 | if (!pktin.data) |
| 150 | fatalbox("Out of memory"); |
| 151 | } |
| 152 | |
| 153 | p = pktin.data, to_read = biglen; |
| 154 | while (to_read > 0) { |
| 155 | static int chunk; |
| 156 | chunk = to_read; |
| 157 | while (datalen == 0) |
| 158 | crReturnV; |
| 159 | if (chunk > datalen) |
| 160 | chunk = datalen; |
| 161 | memcpy(p, data, chunk); |
| 162 | data += chunk; |
| 163 | datalen -= chunk; |
| 164 | p += chunk; |
| 165 | to_read -= chunk; |
| 166 | } |
| 167 | |
| 168 | if (cipher) |
| 169 | cipher->decrypt(pktin.data, biglen); |
| 170 | |
| 171 | pktin.type = pktin.data[pad]; |
| 172 | pktin.body = pktin.data+pad+1; |
| 173 | |
| 174 | if (pktin.type == SSH_MSG_DEBUG) { |
| 175 | /* FIXME: log it */ |
| 176 | } else if (pktin.type == SSH_MSG_IGNORE) { |
| 177 | /* do nothing */; |
| 178 | } else |
| 179 | ssh_protocol(NULL, 0, 1); |
| 180 | } |
| 181 | crFinishV; |
| 182 | } |
| 183 | |
| 184 | static void s_wrpkt_start(int type, int len) { |
| 185 | int pad, biglen; |
| 186 | |
| 187 | len += 5; /* type and CRC */ |
| 188 | pad = 8 - (len%8); |
| 189 | biglen = len + pad; |
| 190 | |
| 191 | pktout.length = len-5; |
| 192 | if (pktout.maxlen < biglen) { |
| 193 | pktout.maxlen = biglen; |
| 194 | pktout.data = (pktout.data == NULL ? malloc(biglen+4) : |
| 195 | realloc(pktout.data, biglen+4)); |
| 196 | if (!pktout.data) |
| 197 | fatalbox("Out of memory"); |
| 198 | } |
| 199 | |
| 200 | pktout.type = type; |
| 201 | pktout.body = pktout.data+4+pad+1; |
| 202 | } |
| 203 | |
| 204 | static void s_wrpkt(void) { |
| 205 | int pad, len, biglen, i; |
| 206 | unsigned long crc; |
| 207 | |
| 208 | len = pktout.length + 5; /* type and CRC */ |
| 209 | pad = 8 - (len%8); |
| 210 | biglen = len + pad; |
| 211 | |
| 212 | pktout.body[-1] = pktout.type; |
| 213 | for (i=0; i<pad; i++) |
| 214 | pktout.data[i+4] = random_byte(); |
| 215 | crc = crc32(pktout.data+4, biglen-4); |
| 216 | |
| 217 | pktout.data[biglen+0] = (unsigned char) ((crc >> 24) & 0xFF); |
| 218 | pktout.data[biglen+1] = (unsigned char) ((crc >> 16) & 0xFF); |
| 219 | pktout.data[biglen+2] = (unsigned char) ((crc >> 8) & 0xFF); |
| 220 | pktout.data[biglen+3] = (unsigned char) (crc & 0xFF); |
| 221 | |
| 222 | pktout.data[0] = (len >> 24) & 0xFF; |
| 223 | pktout.data[1] = (len >> 16) & 0xFF; |
| 224 | pktout.data[2] = (len >> 8) & 0xFF; |
| 225 | pktout.data[3] = len & 0xFF; |
| 226 | |
| 227 | if (cipher) |
| 228 | cipher->encrypt(pktout.data+4, biglen); |
| 229 | |
| 230 | s_write(pktout.data, biglen+4); |
| 231 | } |
| 232 | |
| 233 | static int ssh_versioncmp(char *a, char *b) { |
| 234 | char *ae, *be; |
| 235 | unsigned long av, bv; |
| 236 | |
| 237 | av = strtoul(a, &ae, 10); |
| 238 | bv = strtoul(b, &be, 10); |
| 239 | if (av != bv) return (av < bv ? -1 : +1); |
| 240 | if (*ae == '.') ae++; |
| 241 | if (*be == '.') be++; |
| 242 | av = strtoul(ae, &ae, 10); |
| 243 | bv = strtoul(be, &be, 10); |
| 244 | if (av != bv) return (av < bv ? -1 : +1); |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static int do_ssh_init(void) { |
| 249 | char c; |
| 250 | char version[10]; |
| 251 | char vstring[40]; |
| 252 | int i; |
| 253 | |
| 254 | #ifdef FWHACK |
| 255 | i = 0; |
| 256 | while (s_read(&c, 1) == 1) { |
| 257 | if (c == 'S' && i < 2) i++; |
| 258 | else if (c == 'S' && i == 2) i = 2; |
| 259 | else if (c == 'H' && i == 2) break; |
| 260 | else i = 0; |
| 261 | } |
| 262 | #else |
| 263 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
| 264 | if (s_read(&c,1) != 1 || c != 'S') return 0; |
| 265 | if (s_read(&c,1) != 1 || c != 'H') return 0; |
| 266 | #endif |
| 267 | if (s_read(&c,1) != 1 || c != '-') return 0; |
| 268 | i = 0; |
| 269 | while (1) { |
| 270 | if (s_read(&c,1) != 1) |
| 271 | return 0; |
| 272 | if (i >= 0) { |
| 273 | if (c == '-') { |
| 274 | version[i] = '\0'; |
| 275 | i = -1; |
| 276 | } else if (i < sizeof(version)-1) |
| 277 | version[i++] = c; |
| 278 | } |
| 279 | else if (c == '\n') |
| 280 | break; |
| 281 | } |
| 282 | |
| 283 | sprintf(vstring, "SSH-%s-PuTTY\n", |
| 284 | (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5")); |
| 285 | s_write(vstring, strlen(vstring)); |
| 286 | return 1; |
| 287 | } |
| 288 | |
| 289 | static void ssh_protocol(unsigned char *in, int inlen, int ispkt) { |
| 290 | int i, j, len; |
| 291 | unsigned char session_id[16]; |
| 292 | unsigned char *rsabuf, *keystr1, *keystr2; |
| 293 | unsigned char cookie[8]; |
| 294 | struct RSAKey servkey, hostkey; |
| 295 | struct MD5Context md5c; |
| 296 | unsigned long supported_ciphers_mask; |
| 297 | int cipher_type; |
| 298 | |
| 299 | extern struct ssh_cipher ssh_3des; |
| 300 | extern struct ssh_cipher ssh_des; |
| 301 | extern struct ssh_cipher ssh_blowfish; |
| 302 | |
| 303 | crBegin; |
| 304 | |
| 305 | random_init(); |
| 306 | |
| 307 | while (!ispkt) |
| 308 | crReturnV; |
| 309 | |
| 310 | if (pktin.type != SSH_SMSG_PUBLIC_KEY) |
| 311 | fatalbox("Public key packet not received"); |
| 312 | |
| 313 | memcpy(cookie, pktin.body, 8); |
| 314 | |
| 315 | MD5Init(&md5c); |
| 316 | |
| 317 | i = makekey(pktin.body+8, &servkey, &keystr1); |
| 318 | |
| 319 | j = makekey(pktin.body+8+i, &hostkey, &keystr2); |
| 320 | |
| 321 | supported_ciphers_mask = (pktin.body[12+i+j] << 24) | |
| 322 | (pktin.body[13+i+j] << 16) | |
| 323 | (pktin.body[14+i+j] << 8) | |
| 324 | (pktin.body[15+i+j]); |
| 325 | |
| 326 | MD5Update(&md5c, keystr2, hostkey.bytes); |
| 327 | MD5Update(&md5c, keystr1, servkey.bytes); |
| 328 | MD5Update(&md5c, pktin.body, 8); |
| 329 | |
| 330 | MD5Final(session_id, &md5c); |
| 331 | |
| 332 | for (i=0; i<32; i++) |
| 333 | session_key[i] = random_byte(); |
| 334 | |
| 335 | len = (hostkey.bytes > servkey.bytes ? hostkey.bytes : servkey.bytes); |
| 336 | |
| 337 | rsabuf = malloc(len); |
| 338 | if (!rsabuf) |
| 339 | fatalbox("Out of memory"); |
| 340 | |
| 341 | verify_ssh_host_key(savedhost, &hostkey); |
| 342 | |
| 343 | for (i=0; i<32; i++) { |
| 344 | rsabuf[i] = session_key[i]; |
| 345 | if (i < 16) |
| 346 | rsabuf[i] ^= session_id[i]; |
| 347 | } |
| 348 | |
| 349 | if (hostkey.bytes > servkey.bytes) { |
| 350 | rsaencrypt(rsabuf, 32, &servkey); |
| 351 | rsaencrypt(rsabuf, servkey.bytes, &hostkey); |
| 352 | } else { |
| 353 | rsaencrypt(rsabuf, 32, &hostkey); |
| 354 | rsaencrypt(rsabuf, hostkey.bytes, &servkey); |
| 355 | } |
| 356 | |
| 357 | cipher_type = cfg.cipher == CIPHER_BLOWFISH ? SSH_CIPHER_BLOWFISH : |
| 358 | cfg.cipher == CIPHER_DES ? SSH_CIPHER_DES : |
| 359 | SSH_CIPHER_3DES; |
| 360 | if ((supported_ciphers_mask & (1 << cipher_type)) == 0) { |
| 361 | c_write("Selected cipher not supported, falling back to 3DES\r\n", 53); |
| 362 | cipher_type = SSH_CIPHER_3DES; |
| 363 | } |
| 364 | |
| 365 | s_wrpkt_start(SSH_CMSG_SESSION_KEY, len+15); |
| 366 | pktout.body[0] = cipher_type; |
| 367 | memcpy(pktout.body+1, cookie, 8); |
| 368 | pktout.body[9] = (len*8) >> 8; |
| 369 | pktout.body[10] = (len*8) & 0xFF; |
| 370 | memcpy(pktout.body+11, rsabuf, len); |
| 371 | pktout.body[len+11] = pktout.body[len+12] = 0; /* protocol flags */ |
| 372 | pktout.body[len+13] = pktout.body[len+14] = 0; |
| 373 | s_wrpkt(); |
| 374 | |
| 375 | free(rsabuf); |
| 376 | |
| 377 | cipher = cipher_type == SSH_CIPHER_BLOWFISH ? &ssh_blowfish : |
| 378 | cipher_type == SSH_CIPHER_DES ? &ssh_des : |
| 379 | &ssh_3des; |
| 380 | cipher->sesskey(session_key); |
| 381 | |
| 382 | do { crReturnV; } while (!ispkt); |
| 383 | |
| 384 | if (pktin.type != SSH_SMSG_SUCCESS) |
| 385 | fatalbox("Encryption not successfully enabled"); |
| 386 | |
| 387 | fflush(stdout); |
| 388 | { |
| 389 | static char username[100]; |
| 390 | static int pos = 0; |
| 391 | static char c; |
| 392 | if (!*cfg.username) { |
| 393 | c_write("login as: ", 10); |
| 394 | while (pos >= 0) { |
| 395 | do { crReturnV; } while (ispkt); |
| 396 | while (inlen--) switch (c = *in++) { |
| 397 | case 10: case 13: |
| 398 | username[pos] = 0; |
| 399 | pos = -1; |
| 400 | break; |
| 401 | case 8: case 127: |
| 402 | if (pos > 0) { |
| 403 | c_write("\b \b", 3); |
| 404 | pos--; |
| 405 | } |
| 406 | break; |
| 407 | case 21: case 27: |
| 408 | while (pos > 0) { |
| 409 | c_write("\b \b", 3); |
| 410 | pos--; |
| 411 | } |
| 412 | break; |
| 413 | case 3: case 4: |
| 414 | random_save_seed(); |
| 415 | exit(0); |
| 416 | break; |
| 417 | default: |
| 418 | if (c >= ' ' && c <= '~' && pos < 40) { |
| 419 | username[pos++] = c; |
| 420 | c_write(&c, 1); |
| 421 | } |
| 422 | break; |
| 423 | } |
| 424 | } |
| 425 | c_write("\r\n", 2); |
| 426 | username[strcspn(username, "\n\r")] = '\0'; |
| 427 | } else { |
| 428 | char stuff[200]; |
| 429 | strncpy(username, cfg.username, 99); |
| 430 | username[99] = '\0'; |
| 431 | sprintf(stuff, "Sent username \"%s\".\r\n", username); |
| 432 | c_write(stuff, strlen(stuff)); |
| 433 | } |
| 434 | s_wrpkt_start(SSH_CMSG_USER, 4+strlen(username)); |
| 435 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
| 436 | pktout.body[3] = strlen(username); |
| 437 | memcpy(pktout.body+4, username, strlen(username)); |
| 438 | s_wrpkt(); |
| 439 | } |
| 440 | |
| 441 | do { crReturnV; } while (!ispkt); |
| 442 | |
| 443 | while (pktin.type == SSH_SMSG_FAILURE) { |
| 444 | static char password[100]; |
| 445 | static int pos; |
| 446 | static char c; |
| 447 | c_write("password: ", 10); |
| 448 | pos = 0; |
| 449 | while (pos >= 0) { |
| 450 | do { crReturnV; } while (ispkt); |
| 451 | while (inlen--) switch (c = *in++) { |
| 452 | case 10: case 13: |
| 453 | password[pos] = 0; |
| 454 | pos = -1; |
| 455 | break; |
| 456 | case 8: case 127: |
| 457 | if (pos > 0) |
| 458 | pos--; |
| 459 | break; |
| 460 | case 21: case 27: |
| 461 | pos = 0; |
| 462 | break; |
| 463 | case 3: case 4: |
| 464 | random_save_seed(); |
| 465 | exit(0); |
| 466 | break; |
| 467 | default: |
| 468 | if (c >= ' ' && c <= '~' && pos < 40) |
| 469 | password[pos++] = c; |
| 470 | break; |
| 471 | } |
| 472 | } |
| 473 | c_write("\r\n", 2); |
| 474 | s_wrpkt_start(SSH_CMSG_AUTH_PASSWORD, 4+strlen(password)); |
| 475 | pktout.body[0] = pktout.body[1] = pktout.body[2] = 0; |
| 476 | pktout.body[3] = strlen(password); |
| 477 | memcpy(pktout.body+4, password, strlen(password)); |
| 478 | s_wrpkt(); |
| 479 | memset(password, 0, strlen(password)); |
| 480 | do { crReturnV; } while (!ispkt); |
| 481 | if (pktin.type == 15) { |
| 482 | c_write("Access denied\r\n", 15); |
| 483 | } else if (pktin.type != 14) { |
| 484 | fatalbox("Strange packet received, type %d", pktin.type); |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | if (!cfg.nopty) { |
| 489 | i = strlen(cfg.termtype); |
| 490 | s_wrpkt_start(SSH_CMSG_REQUEST_PTY, i+5*4+1); |
| 491 | pktout.body[0] = (i >> 24) & 0xFF; |
| 492 | pktout.body[1] = (i >> 16) & 0xFF; |
| 493 | pktout.body[2] = (i >> 8) & 0xFF; |
| 494 | pktout.body[3] = i & 0xFF; |
| 495 | memcpy(pktout.body+4, cfg.termtype, i); |
| 496 | i += 4; |
| 497 | pktout.body[i++] = (rows >> 24) & 0xFF; |
| 498 | pktout.body[i++] = (rows >> 16) & 0xFF; |
| 499 | pktout.body[i++] = (rows >> 8) & 0xFF; |
| 500 | pktout.body[i++] = rows & 0xFF; |
| 501 | pktout.body[i++] = (cols >> 24) & 0xFF; |
| 502 | pktout.body[i++] = (cols >> 16) & 0xFF; |
| 503 | pktout.body[i++] = (cols >> 8) & 0xFF; |
| 504 | pktout.body[i++] = cols & 0xFF; |
| 505 | memset(pktout.body+i, 0, 9); /* 0 pixwidth, 0 pixheight, 0.b endofopt */ |
| 506 | s_wrpkt(); |
| 507 | ssh_state = SSH_STATE_INTERMED; |
| 508 | do { crReturnV; } while (!ispkt); |
| 509 | if (pktin.type != SSH_MSG_SUCCESS && pktin.type != SSH_MSG_FAILURE) { |
| 510 | fatalbox("Protocol confusion"); |
| 511 | } else if (pktin.type == SSH_MSG_FAILURE) { |
| 512 | c_write("Server refused to allocate pty\r\n", 32); |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | s_wrpkt_start(SSH_CMSG_EXEC_SHELL, 0); |
| 517 | s_wrpkt(); |
| 518 | |
| 519 | ssh_state = SSH_STATE_SESSION; |
| 520 | if (size_needed) |
| 521 | ssh_size(); |
| 522 | |
| 523 | while (1) { |
| 524 | crReturnV; |
| 525 | if (ispkt) { |
| 526 | if (pktin.type == SSH_SMSG_STDOUT_DATA || |
| 527 | pktin.type == SSH_SMSG_STDERR_DATA) { |
| 528 | long len = 0; |
| 529 | for (i = 0; i < 4; i++) |
| 530 | len = (len << 8) + pktin.body[i]; |
| 531 | c_write(pktin.body+4, len); |
| 532 | } else if (pktin.type == SSH_MSG_DISCONNECT) { |
| 533 | ssh_state = SSH_STATE_CLOSED; |
| 534 | } else if (pktin.type == SSH_MSG_SUCCESS) { |
| 535 | /* may be from EXEC_SHELL on some servers */ |
| 536 | } else if (pktin.type == SSH_MSG_FAILURE) { |
| 537 | /* may be from EXEC_SHELL on some servers |
| 538 | * if no pty is available or in other odd cases. Ignore */ |
| 539 | } else if (pktin.type == SSH_SMSG_EXITSTATUS) { |
| 540 | s_wrpkt_start(SSH_CMSG_EXIT_CONFIRMATION, 0); |
| 541 | s_wrpkt(); |
| 542 | } else { |
| 543 | fatalbox("Strange packet received: type %d", pktin.type); |
| 544 | } |
| 545 | } else { |
| 546 | s_wrpkt_start(SSH_CMSG_STDIN_DATA, 4+inlen); |
| 547 | pktout.body[0] = (inlen >> 24) & 0xFF; |
| 548 | pktout.body[1] = (inlen >> 16) & 0xFF; |
| 549 | pktout.body[2] = (inlen >> 8) & 0xFF; |
| 550 | pktout.body[3] = inlen & 0xFF; |
| 551 | memcpy(pktout.body+4, in, inlen); |
| 552 | s_wrpkt(); |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | crFinishV; |
| 557 | } |
| 558 | |
| 559 | /* |
| 560 | * Called to set up the connection. Will arrange for WM_NETEVENT |
| 561 | * messages to be passed to the specified window, whose window |
| 562 | * procedure should then call telnet_msg(). |
| 563 | * |
| 564 | * Returns an error message, or NULL on success. |
| 565 | * |
| 566 | * Also places the canonical host name into `realhost'. |
| 567 | */ |
| 568 | static char *ssh_init (HWND hwnd, char *host, int port, char **realhost) { |
| 569 | SOCKADDR_IN addr; |
| 570 | struct hostent *h; |
| 571 | unsigned long a; |
| 572 | #ifdef FWHACK |
| 573 | char *FWhost; |
| 574 | int FWport; |
| 575 | #endif |
| 576 | |
| 577 | savedhost = malloc(1+strlen(host)); |
| 578 | if (!savedhost) |
| 579 | fatalbox("Out of memory"); |
| 580 | strcpy(savedhost, host); |
| 581 | |
| 582 | #ifdef FWHACK |
| 583 | FWhost = host; |
| 584 | FWport = port; |
| 585 | host = FWSTR; |
| 586 | port = 23; |
| 587 | #endif |
| 588 | |
| 589 | /* |
| 590 | * Try to find host. |
| 591 | */ |
| 592 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
| 593 | if ( (h = gethostbyname(host)) == NULL) |
| 594 | switch (WSAGetLastError()) { |
| 595 | case WSAENETDOWN: return "Network is down"; |
| 596 | case WSAHOST_NOT_FOUND: case WSANO_DATA: |
| 597 | return "Host does not exist"; |
| 598 | case WSATRY_AGAIN: return "Host not found"; |
| 599 | default: return "gethostbyname: unknown error"; |
| 600 | } |
| 601 | memcpy (&a, h->h_addr, sizeof(a)); |
| 602 | *realhost = h->h_name; |
| 603 | } else |
| 604 | *realhost = host; |
| 605 | #ifdef FWHACK |
| 606 | *realhost = FWhost; |
| 607 | #endif |
| 608 | a = ntohl(a); |
| 609 | |
| 610 | if (port < 0) |
| 611 | port = 22; /* default ssh port */ |
| 612 | |
| 613 | /* |
| 614 | * Open socket. |
| 615 | */ |
| 616 | s = socket(AF_INET, SOCK_STREAM, 0); |
| 617 | if (s == INVALID_SOCKET) |
| 618 | switch (WSAGetLastError()) { |
| 619 | case WSAENETDOWN: return "Network is down"; |
| 620 | case WSAEAFNOSUPPORT: return "TCP/IP support not present"; |
| 621 | default: return "socket(): unknown error"; |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * Bind to local address. |
| 626 | */ |
| 627 | addr.sin_family = AF_INET; |
| 628 | addr.sin_addr.s_addr = htonl(INADDR_ANY); |
| 629 | addr.sin_port = htons(0); |
| 630 | if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
| 631 | switch (WSAGetLastError()) { |
| 632 | case WSAENETDOWN: return "Network is down"; |
| 633 | default: return "bind(): unknown error"; |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * Connect to remote address. |
| 638 | */ |
| 639 | addr.sin_addr.s_addr = htonl(a); |
| 640 | addr.sin_port = htons((short)port); |
| 641 | if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) |
| 642 | switch (WSAGetLastError()) { |
| 643 | case WSAENETDOWN: return "Network is down"; |
| 644 | case WSAECONNREFUSED: return "Connection refused"; |
| 645 | case WSAENETUNREACH: return "Network is unreachable"; |
| 646 | case WSAEHOSTUNREACH: return "No route to host"; |
| 647 | default: return "connect(): unknown error"; |
| 648 | } |
| 649 | |
| 650 | #ifdef FWHACK |
| 651 | send(s, "connect ", 8, 0); |
| 652 | send(s, FWhost, strlen(FWhost), 0); |
| 653 | { |
| 654 | char buf[20]; |
| 655 | sprintf(buf, " %d\n", FWport); |
| 656 | send (s, buf, strlen(buf), 0); |
| 657 | } |
| 658 | #endif |
| 659 | |
| 660 | if (!do_ssh_init()) |
| 661 | return "Protocol initialisation error"; |
| 662 | |
| 663 | if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | FD_CLOSE) == SOCKET_ERROR) |
| 664 | switch (WSAGetLastError()) { |
| 665 | case WSAENETDOWN: return "Network is down"; |
| 666 | default: return "WSAAsyncSelect(): unknown error"; |
| 667 | } |
| 668 | |
| 669 | return NULL; |
| 670 | } |
| 671 | |
| 672 | /* |
| 673 | * Process a WM_NETEVENT message. Will return 0 if the connection |
| 674 | * has closed, or <0 for a socket error. |
| 675 | */ |
| 676 | static int ssh_msg (WPARAM wParam, LPARAM lParam) { |
| 677 | int ret; |
| 678 | char buf[256]; |
| 679 | |
| 680 | if (s == INVALID_SOCKET) /* how the hell did we get here?! */ |
| 681 | return -5000; |
| 682 | |
| 683 | if (WSAGETSELECTERROR(lParam) != 0) |
| 684 | return -WSAGETSELECTERROR(lParam); |
| 685 | |
| 686 | switch (WSAGETSELECTEVENT(lParam)) { |
| 687 | case FD_READ: |
| 688 | ret = recv(s, buf, sizeof(buf), 0); |
| 689 | if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) |
| 690 | return 1; |
| 691 | if (ret < 0) /* any _other_ error */ |
| 692 | return -10000-WSAGetLastError(); |
| 693 | if (ret == 0) { |
| 694 | s = INVALID_SOCKET; |
| 695 | return 0; /* can't happen, in theory */ |
| 696 | } |
| 697 | ssh_gotdata (buf, ret); |
| 698 | return 1; |
| 699 | case FD_CLOSE: |
| 700 | s = INVALID_SOCKET; |
| 701 | ssh_state = SSH_STATE_CLOSED; |
| 702 | return 0; |
| 703 | } |
| 704 | return 1; /* shouldn't happen, but WTF */ |
| 705 | } |
| 706 | |
| 707 | /* |
| 708 | * Called to send data down the Telnet connection. |
| 709 | */ |
| 710 | static void ssh_send (char *buf, int len) { |
| 711 | if (s == INVALID_SOCKET) |
| 712 | return; |
| 713 | |
| 714 | ssh_protocol(buf, len, 0); |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | * Called to set the size of the window from Telnet's POV. |
| 719 | */ |
| 720 | static void ssh_size(void) { |
| 721 | switch (ssh_state) { |
| 722 | case SSH_STATE_BEFORE_SIZE: |
| 723 | case SSH_STATE_CLOSED: |
| 724 | break; /* do nothing */ |
| 725 | case SSH_STATE_INTERMED: |
| 726 | size_needed = TRUE; /* buffer for later */ |
| 727 | break; |
| 728 | case SSH_STATE_SESSION: |
| 729 | if (!cfg.nopty) { |
| 730 | s_wrpkt_start(11, 16); |
| 731 | pktout.body[0] = (rows >> 24) & 0xFF; |
| 732 | pktout.body[1] = (rows >> 16) & 0xFF; |
| 733 | pktout.body[2] = (rows >> 8) & 0xFF; |
| 734 | pktout.body[3] = rows & 0xFF; |
| 735 | pktout.body[4] = (cols >> 24) & 0xFF; |
| 736 | pktout.body[5] = (cols >> 16) & 0xFF; |
| 737 | pktout.body[6] = (cols >> 8) & 0xFF; |
| 738 | pktout.body[7] = cols & 0xFF; |
| 739 | memset(pktout.body+8, 0, 8); |
| 740 | s_wrpkt(); |
| 741 | } |
| 742 | } |
| 743 | } |
| 744 | |
| 745 | /* |
| 746 | * (Send Telnet special codes) |
| 747 | */ |
| 748 | static void ssh_special (Telnet_Special code) { |
| 749 | /* do nothing */ |
| 750 | } |
| 751 | |
| 752 | Backend ssh_backend = { |
| 753 | ssh_init, |
| 754 | ssh_msg, |
| 755 | ssh_send, |
| 756 | ssh_size, |
| 757 | ssh_special |
| 758 | }; |