| 1 | /* |
| 2 | * PLink - a command-line (stdin/stdout) variant of PuTTY. |
| 3 | */ |
| 4 | |
| 5 | #ifndef AUTO_WINSOCK |
| 6 | #include <winsock2.h> |
| 7 | #endif |
| 8 | #include <windows.h> |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <stdarg.h> |
| 12 | |
| 13 | #define PUTTY_DO_GLOBALS /* actually _define_ globals */ |
| 14 | #include "putty.h" |
| 15 | #include "storage.h" |
| 16 | #include "tree234.h" |
| 17 | |
| 18 | #define MAX_STDIN_BACKLOG 4096 |
| 19 | |
| 20 | void fatalbox(char *p, ...) |
| 21 | { |
| 22 | va_list ap; |
| 23 | fprintf(stderr, "FATAL ERROR: "); |
| 24 | va_start(ap, p); |
| 25 | vfprintf(stderr, p, ap); |
| 26 | va_end(ap); |
| 27 | fputc('\n', stderr); |
| 28 | WSACleanup(); |
| 29 | exit(1); |
| 30 | } |
| 31 | void connection_fatal(char *p, ...) |
| 32 | { |
| 33 | va_list ap; |
| 34 | fprintf(stderr, "FATAL ERROR: "); |
| 35 | va_start(ap, p); |
| 36 | vfprintf(stderr, p, ap); |
| 37 | va_end(ap); |
| 38 | fputc('\n', stderr); |
| 39 | WSACleanup(); |
| 40 | exit(1); |
| 41 | } |
| 42 | |
| 43 | static char *password = NULL; |
| 44 | |
| 45 | void logevent(char *string) |
| 46 | { |
| 47 | } |
| 48 | |
| 49 | void verify_ssh_host_key(char *host, int port, char *keytype, |
| 50 | char *keystr, char *fingerprint) |
| 51 | { |
| 52 | int ret; |
| 53 | HANDLE hin; |
| 54 | DWORD savemode, i; |
| 55 | |
| 56 | static const char absentmsg[] = |
| 57 | "The server's host key is not cached in the registry. You\n" |
| 58 | "have no guarantee that the server is the computer you\n" |
| 59 | "think it is.\n" |
| 60 | "The server's key fingerprint is:\n" |
| 61 | "%s\n" |
| 62 | "If you trust this host, enter \"y\" to add the key to\n" |
| 63 | "PuTTY's cache and carry on connecting.\n" |
| 64 | "If you want to carry on connecting just once, without\n" |
| 65 | "adding the key to the cache, enter \"n\".\n" |
| 66 | "If you do not trust this host, press Return to abandon the\n" |
| 67 | "connection.\n" |
| 68 | "Store key in cache? (y/n) "; |
| 69 | |
| 70 | static const char wrongmsg[] = |
| 71 | "WARNING - POTENTIAL SECURITY BREACH!\n" |
| 72 | "The server's host key does not match the one PuTTY has\n" |
| 73 | "cached in the registry. This means that either the\n" |
| 74 | "server administrator has changed the host key, or you\n" |
| 75 | "have actually connected to another computer pretending\n" |
| 76 | "to be the server.\n" |
| 77 | "The new key fingerprint is:\n" |
| 78 | "%s\n" |
| 79 | "If you were expecting this change and trust the new key,\n" |
| 80 | "enter \"y\" to update PuTTY's cache and continue connecting.\n" |
| 81 | "If you want to carry on connecting but without updating\n" |
| 82 | "the cache, enter \"n\".\n" |
| 83 | "If you want to abandon the connection completely, press\n" |
| 84 | "Return to cancel. Pressing Return is the ONLY guaranteed\n" |
| 85 | "safe choice.\n" |
| 86 | "Update cached key? (y/n, Return cancels connection) "; |
| 87 | |
| 88 | static const char abandoned[] = "Connection abandoned.\n"; |
| 89 | |
| 90 | char line[32]; |
| 91 | |
| 92 | /* |
| 93 | * Verify the key against the registry. |
| 94 | */ |
| 95 | ret = verify_host_key(host, port, keytype, keystr); |
| 96 | |
| 97 | if (ret == 0) /* success - key matched OK */ |
| 98 | return; |
| 99 | |
| 100 | if (ret == 2) { /* key was different */ |
| 101 | fprintf(stderr, wrongmsg, fingerprint); |
| 102 | fflush(stderr); |
| 103 | } |
| 104 | if (ret == 1) { /* key was absent */ |
| 105 | fprintf(stderr, absentmsg, fingerprint); |
| 106 | fflush(stderr); |
| 107 | } |
| 108 | |
| 109 | hin = GetStdHandle(STD_INPUT_HANDLE); |
| 110 | GetConsoleMode(hin, &savemode); |
| 111 | SetConsoleMode(hin, (savemode | ENABLE_ECHO_INPUT | |
| 112 | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT)); |
| 113 | ReadFile(hin, line, sizeof(line) - 1, &i, NULL); |
| 114 | SetConsoleMode(hin, savemode); |
| 115 | |
| 116 | if (line[0] != '\0' && line[0] != '\r' && line[0] != '\n') { |
| 117 | if (line[0] == 'y' || line[0] == 'Y') |
| 118 | store_host_key(host, port, keytype, keystr); |
| 119 | } else { |
| 120 | fprintf(stderr, abandoned); |
| 121 | exit(0); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | /* |
| 126 | * Ask whether the selected cipher is acceptable (since it was |
| 127 | * below the configured 'warn' threshold). |
| 128 | * cs: 0 = both ways, 1 = client->server, 2 = server->client |
| 129 | */ |
| 130 | void askcipher(char *ciphername, int cs) |
| 131 | { |
| 132 | HANDLE hin; |
| 133 | DWORD savemode, i; |
| 134 | |
| 135 | static const char msg[] = |
| 136 | "The first %scipher supported by the server is\n" |
| 137 | "%s, which is below the configured warning threshold.\n" |
| 138 | "Continue with connection? (y/n) "; |
| 139 | static const char abandoned[] = "Connection abandoned.\n"; |
| 140 | |
| 141 | char line[32]; |
| 142 | |
| 143 | fprintf(stderr, msg, |
| 144 | (cs == 0) ? "" : |
| 145 | (cs == 1) ? "client-to-server " : |
| 146 | "server-to-client ", |
| 147 | ciphername); |
| 148 | fflush(stderr); |
| 149 | |
| 150 | hin = GetStdHandle(STD_INPUT_HANDLE); |
| 151 | GetConsoleMode(hin, &savemode); |
| 152 | SetConsoleMode(hin, (savemode | ENABLE_ECHO_INPUT | |
| 153 | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT)); |
| 154 | ReadFile(hin, line, sizeof(line) - 1, &i, NULL); |
| 155 | SetConsoleMode(hin, savemode); |
| 156 | |
| 157 | if (line[0] == 'y' || line[0] == 'Y') { |
| 158 | return; |
| 159 | } else { |
| 160 | fprintf(stderr, abandoned); |
| 161 | exit(0); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | HANDLE inhandle, outhandle, errhandle; |
| 166 | DWORD orig_console_mode; |
| 167 | |
| 168 | WSAEVENT netevent; |
| 169 | |
| 170 | int term_ldisc(int mode) |
| 171 | { |
| 172 | return FALSE; |
| 173 | } |
| 174 | void ldisc_update(int echo, int edit) |
| 175 | { |
| 176 | /* Update stdin read mode to reflect changes in line discipline. */ |
| 177 | DWORD mode; |
| 178 | |
| 179 | mode = ENABLE_PROCESSED_INPUT; |
| 180 | if (echo) |
| 181 | mode = mode | ENABLE_ECHO_INPUT; |
| 182 | else |
| 183 | mode = mode & ~ENABLE_ECHO_INPUT; |
| 184 | if (edit) |
| 185 | mode = mode | ENABLE_LINE_INPUT; |
| 186 | else |
| 187 | mode = mode & ~ENABLE_LINE_INPUT; |
| 188 | SetConsoleMode(inhandle, mode); |
| 189 | } |
| 190 | |
| 191 | static int get_line(const char *prompt, char *str, int maxlen, int is_pw) |
| 192 | { |
| 193 | HANDLE hin, hout; |
| 194 | DWORD savemode, newmode, i; |
| 195 | |
| 196 | if (is_pw && password) { |
| 197 | static int tried_once = 0; |
| 198 | |
| 199 | if (tried_once) { |
| 200 | return 0; |
| 201 | } else { |
| 202 | strncpy(str, password, maxlen); |
| 203 | str[maxlen - 1] = '\0'; |
| 204 | tried_once = 1; |
| 205 | return 1; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | hin = GetStdHandle(STD_INPUT_HANDLE); |
| 210 | hout = GetStdHandle(STD_OUTPUT_HANDLE); |
| 211 | if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) { |
| 212 | fprintf(stderr, "Cannot get standard input/output handles"); |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | GetConsoleMode(hin, &savemode); |
| 217 | newmode = savemode | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT; |
| 218 | if (is_pw) |
| 219 | newmode &= ~ENABLE_ECHO_INPUT; |
| 220 | else |
| 221 | newmode |= ENABLE_ECHO_INPUT; |
| 222 | SetConsoleMode(hin, newmode); |
| 223 | |
| 224 | WriteFile(hout, prompt, strlen(prompt), &i, NULL); |
| 225 | ReadFile(hin, str, maxlen - 1, &i, NULL); |
| 226 | |
| 227 | SetConsoleMode(hin, savemode); |
| 228 | |
| 229 | if ((int) i > maxlen) |
| 230 | i = maxlen - 1; |
| 231 | else |
| 232 | i = i - 2; |
| 233 | str[i] = '\0'; |
| 234 | |
| 235 | if (is_pw) |
| 236 | WriteFile(hout, "\r\n", 2, &i, NULL); |
| 237 | |
| 238 | return 1; |
| 239 | } |
| 240 | |
| 241 | struct input_data { |
| 242 | DWORD len; |
| 243 | char buffer[4096]; |
| 244 | HANDLE event, eventback; |
| 245 | }; |
| 246 | |
| 247 | static DWORD WINAPI stdin_read_thread(void *param) |
| 248 | { |
| 249 | struct input_data *idata = (struct input_data *) param; |
| 250 | HANDLE inhandle; |
| 251 | |
| 252 | inhandle = GetStdHandle(STD_INPUT_HANDLE); |
| 253 | |
| 254 | while (ReadFile(inhandle, idata->buffer, sizeof(idata->buffer), |
| 255 | &idata->len, NULL) && idata->len > 0) { |
| 256 | SetEvent(idata->event); |
| 257 | WaitForSingleObject(idata->eventback, INFINITE); |
| 258 | } |
| 259 | |
| 260 | idata->len = 0; |
| 261 | SetEvent(idata->event); |
| 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | struct output_data { |
| 267 | DWORD len, lenwritten; |
| 268 | int writeret; |
| 269 | char *buffer; |
| 270 | int is_stderr, done; |
| 271 | HANDLE event, eventback; |
| 272 | int busy; |
| 273 | }; |
| 274 | |
| 275 | static DWORD WINAPI stdout_write_thread(void *param) |
| 276 | { |
| 277 | struct output_data *odata = (struct output_data *) param; |
| 278 | HANDLE outhandle, errhandle; |
| 279 | |
| 280 | outhandle = GetStdHandle(STD_OUTPUT_HANDLE); |
| 281 | errhandle = GetStdHandle(STD_ERROR_HANDLE); |
| 282 | |
| 283 | while (1) { |
| 284 | WaitForSingleObject(odata->eventback, INFINITE); |
| 285 | if (odata->done) |
| 286 | break; |
| 287 | odata->writeret = |
| 288 | WriteFile(odata->is_stderr ? errhandle : outhandle, |
| 289 | odata->buffer, odata->len, &odata->lenwritten, NULL); |
| 290 | SetEvent(odata->event); |
| 291 | } |
| 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | bufchain stdout_data, stderr_data; |
| 297 | struct output_data odata, edata; |
| 298 | |
| 299 | void try_output(int is_stderr) |
| 300 | { |
| 301 | struct output_data *data = (is_stderr ? &edata : &odata); |
| 302 | void *senddata; |
| 303 | int sendlen; |
| 304 | |
| 305 | if (!data->busy) { |
| 306 | bufchain_prefix(is_stderr ? &stderr_data : &stdout_data, |
| 307 | &senddata, &sendlen); |
| 308 | data->buffer = senddata; |
| 309 | data->len = sendlen; |
| 310 | SetEvent(data->eventback); |
| 311 | data->busy = 1; |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | int from_backend(int is_stderr, char *data, int len) |
| 316 | { |
| 317 | int pos; |
| 318 | DWORD ret; |
| 319 | HANDLE h = (is_stderr ? errhandle : outhandle); |
| 320 | void *writedata; |
| 321 | int writelen; |
| 322 | int osize, esize; |
| 323 | |
| 324 | if (is_stderr) { |
| 325 | bufchain_add(&stderr_data, data, len); |
| 326 | try_output(1); |
| 327 | } else { |
| 328 | bufchain_add(&stdout_data, data, len); |
| 329 | try_output(0); |
| 330 | } |
| 331 | |
| 332 | osize = bufchain_size(&stdout_data); |
| 333 | esize = bufchain_size(&stderr_data); |
| 334 | |
| 335 | return osize + esize; |
| 336 | } |
| 337 | |
| 338 | /* |
| 339 | * Short description of parameters. |
| 340 | */ |
| 341 | static void usage(void) |
| 342 | { |
| 343 | printf("PuTTY Link: command-line connection utility\n"); |
| 344 | printf("%s\n", ver); |
| 345 | printf("Usage: plink [options] [user@]host [command]\n"); |
| 346 | printf("Options:\n"); |
| 347 | printf(" -v show verbose messages\n"); |
| 348 | printf(" -ssh force use of ssh protocol\n"); |
| 349 | printf(" -P port connect to specified port\n"); |
| 350 | printf(" -pw passw login with specified password\n"); |
| 351 | printf(" -m file read remote command(s) from file\n"); |
| 352 | exit(1); |
| 353 | } |
| 354 | |
| 355 | char *do_select(SOCKET skt, int startup) |
| 356 | { |
| 357 | int events; |
| 358 | if (startup) { |
| 359 | events = FD_READ | FD_WRITE | FD_OOB | FD_CLOSE | FD_ACCEPT; |
| 360 | } else { |
| 361 | events = 0; |
| 362 | } |
| 363 | if (WSAEventSelect(skt, netevent, events) == SOCKET_ERROR) { |
| 364 | switch (WSAGetLastError()) { |
| 365 | case WSAENETDOWN: |
| 366 | return "Network is down"; |
| 367 | default: |
| 368 | return "WSAAsyncSelect(): unknown error"; |
| 369 | } |
| 370 | } |
| 371 | return NULL; |
| 372 | } |
| 373 | |
| 374 | int main(int argc, char **argv) |
| 375 | { |
| 376 | WSADATA wsadata; |
| 377 | WORD winsock_ver; |
| 378 | WSAEVENT stdinevent, stdoutevent, stderrevent; |
| 379 | HANDLE handles[4]; |
| 380 | DWORD in_threadid, out_threadid, err_threadid; |
| 381 | struct input_data idata; |
| 382 | int reading; |
| 383 | int sending; |
| 384 | int portnumber = -1; |
| 385 | SOCKET *sklist; |
| 386 | int skcount, sksize; |
| 387 | int connopen; |
| 388 | |
| 389 | ssh_get_line = get_line; |
| 390 | |
| 391 | sklist = NULL; |
| 392 | skcount = sksize = 0; |
| 393 | /* |
| 394 | * Initialise port and protocol to sensible defaults. (These |
| 395 | * will be overridden by more or less anything.) |
| 396 | */ |
| 397 | default_protocol = PROT_SSH; |
| 398 | default_port = 22; |
| 399 | |
| 400 | flags = FLAG_STDERR; |
| 401 | /* |
| 402 | * Process the command line. |
| 403 | */ |
| 404 | do_defaults(NULL, &cfg); |
| 405 | default_protocol = cfg.protocol; |
| 406 | default_port = cfg.port; |
| 407 | { |
| 408 | /* |
| 409 | * Override the default protocol if PLINK_PROTOCOL is set. |
| 410 | */ |
| 411 | char *p = getenv("PLINK_PROTOCOL"); |
| 412 | int i; |
| 413 | if (p) { |
| 414 | for (i = 0; backends[i].backend != NULL; i++) { |
| 415 | if (!strcmp(backends[i].name, p)) { |
| 416 | default_protocol = cfg.protocol = backends[i].protocol; |
| 417 | default_port = cfg.port = |
| 418 | backends[i].backend->default_port; |
| 419 | break; |
| 420 | } |
| 421 | } |
| 422 | } |
| 423 | } |
| 424 | while (--argc) { |
| 425 | char *p = *++argv; |
| 426 | if (*p == '-') { |
| 427 | if (!strcmp(p, "-ssh")) { |
| 428 | default_protocol = cfg.protocol = PROT_SSH; |
| 429 | default_port = cfg.port = 22; |
| 430 | } else if (!strcmp(p, "-telnet")) { |
| 431 | default_protocol = cfg.protocol = PROT_TELNET; |
| 432 | default_port = cfg.port = 23; |
| 433 | } else if (!strcmp(p, "-raw")) { |
| 434 | default_protocol = cfg.protocol = PROT_RAW; |
| 435 | } else if (!strcmp(p, "-v")) { |
| 436 | flags |= FLAG_VERBOSE; |
| 437 | } else if (!strcmp(p, "-log")) { |
| 438 | logfile = "putty.log"; |
| 439 | } else if (!strcmp(p, "-pw") && argc > 1) { |
| 440 | --argc, password = *++argv; |
| 441 | } else if (!strcmp(p, "-l") && argc > 1) { |
| 442 | char *username; |
| 443 | --argc, username = *++argv; |
| 444 | strncpy(cfg.username, username, sizeof(cfg.username)); |
| 445 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
| 446 | } else if (!strcmp(p, "-m") && argc > 1) { |
| 447 | char *filename, *command; |
| 448 | int cmdlen, cmdsize; |
| 449 | FILE *fp; |
| 450 | int c, d; |
| 451 | |
| 452 | --argc, filename = *++argv; |
| 453 | |
| 454 | cmdlen = cmdsize = 0; |
| 455 | command = NULL; |
| 456 | fp = fopen(filename, "r"); |
| 457 | if (!fp) { |
| 458 | fprintf(stderr, "plink: unable to open command " |
| 459 | "file \"%s\"\n", filename); |
| 460 | return 1; |
| 461 | } |
| 462 | do { |
| 463 | c = fgetc(fp); |
| 464 | d = c; |
| 465 | if (c == EOF) |
| 466 | d = 0; |
| 467 | if (cmdlen >= cmdsize) { |
| 468 | cmdsize = cmdlen + 512; |
| 469 | command = srealloc(command, cmdsize); |
| 470 | } |
| 471 | command[cmdlen++] = d; |
| 472 | } while (c != EOF); |
| 473 | cfg.remote_cmd_ptr = command; |
| 474 | cfg.remote_cmd_ptr2 = NULL; |
| 475 | cfg.nopty = TRUE; /* command => no terminal */ |
| 476 | } else if (!strcmp(p, "-P") && argc > 1) { |
| 477 | --argc, portnumber = atoi(*++argv); |
| 478 | } |
| 479 | } else if (*p) { |
| 480 | if (!*cfg.host) { |
| 481 | char *q = p; |
| 482 | /* |
| 483 | * If the hostname starts with "telnet:", set the |
| 484 | * protocol to Telnet and process the string as a |
| 485 | * Telnet URL. |
| 486 | */ |
| 487 | if (!strncmp(q, "telnet:", 7)) { |
| 488 | char c; |
| 489 | |
| 490 | q += 7; |
| 491 | if (q[0] == '/' && q[1] == '/') |
| 492 | q += 2; |
| 493 | cfg.protocol = PROT_TELNET; |
| 494 | p = q; |
| 495 | while (*p && *p != ':' && *p != '/') |
| 496 | p++; |
| 497 | c = *p; |
| 498 | if (*p) |
| 499 | *p++ = '\0'; |
| 500 | if (c == ':') |
| 501 | cfg.port = atoi(p); |
| 502 | else |
| 503 | cfg.port = -1; |
| 504 | strncpy(cfg.host, q, sizeof(cfg.host) - 1); |
| 505 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
| 506 | } else { |
| 507 | char *r; |
| 508 | /* |
| 509 | * Before we process the [user@]host string, we |
| 510 | * first check for the presence of a protocol |
| 511 | * prefix (a protocol name followed by ","). |
| 512 | */ |
| 513 | r = strchr(p, ','); |
| 514 | if (r) { |
| 515 | int i, j; |
| 516 | for (i = 0; backends[i].backend != NULL; i++) { |
| 517 | j = strlen(backends[i].name); |
| 518 | if (j == r - p && |
| 519 | !memcmp(backends[i].name, p, j)) { |
| 520 | default_protocol = cfg.protocol = |
| 521 | backends[i].protocol; |
| 522 | portnumber = |
| 523 | backends[i].backend->default_port; |
| 524 | p = r + 1; |
| 525 | break; |
| 526 | } |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | * Three cases. Either (a) there's a nonzero |
| 532 | * length string followed by an @, in which |
| 533 | * case that's user and the remainder is host. |
| 534 | * Or (b) there's only one string, not counting |
| 535 | * a potential initial @, and it exists in the |
| 536 | * saved-sessions database. Or (c) only one |
| 537 | * string and it _doesn't_ exist in the |
| 538 | * database. |
| 539 | */ |
| 540 | r = strrchr(p, '@'); |
| 541 | if (r == p) |
| 542 | p++, r = NULL; /* discount initial @ */ |
| 543 | if (r == NULL) { |
| 544 | /* |
| 545 | * One string. |
| 546 | */ |
| 547 | Config cfg2; |
| 548 | do_defaults(p, &cfg2); |
| 549 | if (cfg2.host[0] == '\0') { |
| 550 | /* No settings for this host; use defaults */ |
| 551 | strncpy(cfg.host, p, sizeof(cfg.host) - 1); |
| 552 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
| 553 | cfg.port = default_port; |
| 554 | } else { |
| 555 | cfg = cfg2; |
| 556 | cfg.remote_cmd_ptr = cfg.remote_cmd; |
| 557 | } |
| 558 | } else { |
| 559 | *r++ = '\0'; |
| 560 | strncpy(cfg.username, p, sizeof(cfg.username) - 1); |
| 561 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
| 562 | strncpy(cfg.host, r, sizeof(cfg.host) - 1); |
| 563 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
| 564 | cfg.port = default_port; |
| 565 | } |
| 566 | } |
| 567 | } else { |
| 568 | int len = sizeof(cfg.remote_cmd) - 1; |
| 569 | char *cp = cfg.remote_cmd; |
| 570 | int len2; |
| 571 | |
| 572 | strncpy(cp, p, len); |
| 573 | cp[len] = '\0'; |
| 574 | len2 = strlen(cp); |
| 575 | len -= len2; |
| 576 | cp += len2; |
| 577 | while (--argc) { |
| 578 | if (len > 0) |
| 579 | len--, *cp++ = ' '; |
| 580 | strncpy(cp, *++argv, len); |
| 581 | cp[len] = '\0'; |
| 582 | len2 = strlen(cp); |
| 583 | len -= len2; |
| 584 | cp += len2; |
| 585 | } |
| 586 | cfg.nopty = TRUE; /* command => no terminal */ |
| 587 | break; /* done with cmdline */ |
| 588 | } |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | if (!*cfg.host) { |
| 593 | usage(); |
| 594 | } |
| 595 | |
| 596 | if (!*cfg.remote_cmd_ptr) |
| 597 | flags |= FLAG_INTERACTIVE; |
| 598 | |
| 599 | /* |
| 600 | * Select protocol. This is farmed out into a table in a |
| 601 | * separate file to enable an ssh-free variant. |
| 602 | */ |
| 603 | { |
| 604 | int i; |
| 605 | back = NULL; |
| 606 | for (i = 0; backends[i].backend != NULL; i++) |
| 607 | if (backends[i].protocol == cfg.protocol) { |
| 608 | back = backends[i].backend; |
| 609 | break; |
| 610 | } |
| 611 | if (back == NULL) { |
| 612 | fprintf(stderr, |
| 613 | "Internal fault: Unsupported protocol found\n"); |
| 614 | return 1; |
| 615 | } |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * Select port. |
| 620 | */ |
| 621 | if (portnumber != -1) |
| 622 | cfg.port = portnumber; |
| 623 | |
| 624 | /* |
| 625 | * Initialise WinSock. |
| 626 | */ |
| 627 | winsock_ver = MAKEWORD(2, 0); |
| 628 | if (WSAStartup(winsock_ver, &wsadata)) { |
| 629 | MessageBox(NULL, "Unable to initialise WinSock", "WinSock Error", |
| 630 | MB_OK | MB_ICONEXCLAMATION); |
| 631 | return 1; |
| 632 | } |
| 633 | if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wVersion) != 0) { |
| 634 | MessageBox(NULL, "WinSock version is incompatible with 2.0", |
| 635 | "WinSock Error", MB_OK | MB_ICONEXCLAMATION); |
| 636 | WSACleanup(); |
| 637 | return 1; |
| 638 | } |
| 639 | sk_init(); |
| 640 | |
| 641 | /* |
| 642 | * Start up the connection. |
| 643 | */ |
| 644 | netevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 645 | { |
| 646 | char *error; |
| 647 | char *realhost; |
| 648 | |
| 649 | error = back->init(cfg.host, cfg.port, &realhost); |
| 650 | if (error) { |
| 651 | fprintf(stderr, "Unable to open connection:\n%s", error); |
| 652 | return 1; |
| 653 | } |
| 654 | sfree(realhost); |
| 655 | } |
| 656 | connopen = 1; |
| 657 | |
| 658 | stdinevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 659 | stdoutevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 660 | stderrevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 661 | |
| 662 | inhandle = GetStdHandle(STD_INPUT_HANDLE); |
| 663 | outhandle = GetStdHandle(STD_OUTPUT_HANDLE); |
| 664 | errhandle = GetStdHandle(STD_ERROR_HANDLE); |
| 665 | GetConsoleMode(inhandle, &orig_console_mode); |
| 666 | SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT); |
| 667 | |
| 668 | /* |
| 669 | * Turn off ECHO and LINE input modes. We don't care if this |
| 670 | * call fails, because we know we aren't necessarily running in |
| 671 | * a console. |
| 672 | */ |
| 673 | handles[0] = netevent; |
| 674 | handles[1] = stdinevent; |
| 675 | handles[2] = stdoutevent; |
| 676 | handles[3] = stderrevent; |
| 677 | sending = FALSE; |
| 678 | |
| 679 | /* |
| 680 | * Create spare threads to write to stdout and stderr, so we |
| 681 | * can arrange asynchronous writes. |
| 682 | */ |
| 683 | odata.event = stdoutevent; |
| 684 | odata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 685 | odata.is_stderr = 0; |
| 686 | odata.busy = odata.done = 0; |
| 687 | if (!CreateThread(NULL, 0, stdout_write_thread, |
| 688 | &odata, 0, &out_threadid)) { |
| 689 | fprintf(stderr, "Unable to create output thread\n"); |
| 690 | exit(1); |
| 691 | } |
| 692 | edata.event = stderrevent; |
| 693 | edata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 694 | edata.is_stderr = 1; |
| 695 | edata.busy = edata.done = 0; |
| 696 | if (!CreateThread(NULL, 0, stdout_write_thread, |
| 697 | &edata, 0, &err_threadid)) { |
| 698 | fprintf(stderr, "Unable to create error output thread\n"); |
| 699 | exit(1); |
| 700 | } |
| 701 | |
| 702 | while (1) { |
| 703 | int n; |
| 704 | |
| 705 | if (!sending && back->sendok()) { |
| 706 | /* |
| 707 | * Create a separate thread to read from stdin. This is |
| 708 | * a total pain, but I can't find another way to do it: |
| 709 | * |
| 710 | * - an overlapped ReadFile or ReadFileEx just doesn't |
| 711 | * happen; we get failure from ReadFileEx, and |
| 712 | * ReadFile blocks despite being given an OVERLAPPED |
| 713 | * structure. Perhaps we can't do overlapped reads |
| 714 | * on consoles. WHY THE HELL NOT? |
| 715 | * |
| 716 | * - WaitForMultipleObjects(netevent, console) doesn't |
| 717 | * work, because it signals the console when |
| 718 | * _anything_ happens, including mouse motions and |
| 719 | * other things that don't cause data to be readable |
| 720 | * - so we're back to ReadFile blocking. |
| 721 | */ |
| 722 | idata.event = stdinevent; |
| 723 | idata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 724 | if (!CreateThread(NULL, 0, stdin_read_thread, |
| 725 | &idata, 0, &in_threadid)) { |
| 726 | fprintf(stderr, "Unable to create input thread\n"); |
| 727 | exit(1); |
| 728 | } |
| 729 | sending = TRUE; |
| 730 | } |
| 731 | |
| 732 | n = WaitForMultipleObjects(4, handles, FALSE, INFINITE); |
| 733 | if (n == 0) { |
| 734 | WSANETWORKEVENTS things; |
| 735 | SOCKET socket; |
| 736 | extern SOCKET first_socket(int *), next_socket(int *); |
| 737 | extern int select_result(WPARAM, LPARAM); |
| 738 | int i, socketstate; |
| 739 | |
| 740 | /* |
| 741 | * We must not call select_result() for any socket |
| 742 | * until we have finished enumerating within the tree. |
| 743 | * This is because select_result() may close the socket |
| 744 | * and modify the tree. |
| 745 | */ |
| 746 | /* Count the active sockets. */ |
| 747 | i = 0; |
| 748 | for (socket = first_socket(&socketstate); |
| 749 | socket != INVALID_SOCKET; |
| 750 | socket = next_socket(&socketstate)) i++; |
| 751 | |
| 752 | /* Expand the buffer if necessary. */ |
| 753 | if (i > sksize) { |
| 754 | sksize = i + 16; |
| 755 | sklist = srealloc(sklist, sksize * sizeof(*sklist)); |
| 756 | } |
| 757 | |
| 758 | /* Retrieve the sockets into sklist. */ |
| 759 | skcount = 0; |
| 760 | for (socket = first_socket(&socketstate); |
| 761 | socket != INVALID_SOCKET; |
| 762 | socket = next_socket(&socketstate)) { |
| 763 | sklist[skcount++] = socket; |
| 764 | } |
| 765 | |
| 766 | /* Now we're done enumerating; go through the list. */ |
| 767 | for (i = 0; i < skcount; i++) { |
| 768 | WPARAM wp; |
| 769 | socket = sklist[i]; |
| 770 | wp = (WPARAM) socket; |
| 771 | if (!WSAEnumNetworkEvents(socket, NULL, &things)) { |
| 772 | noise_ultralight(socket); |
| 773 | noise_ultralight(things.lNetworkEvents); |
| 774 | if (things.lNetworkEvents & FD_READ) |
| 775 | connopen &= select_result(wp, (LPARAM) FD_READ); |
| 776 | if (things.lNetworkEvents & FD_CLOSE) |
| 777 | connopen &= select_result(wp, (LPARAM) FD_CLOSE); |
| 778 | if (things.lNetworkEvents & FD_OOB) |
| 779 | connopen &= select_result(wp, (LPARAM) FD_OOB); |
| 780 | if (things.lNetworkEvents & FD_WRITE) |
| 781 | connopen &= select_result(wp, (LPARAM) FD_WRITE); |
| 782 | if (things.lNetworkEvents & FD_ACCEPT) |
| 783 | connopen &= select_result(wp, (LPARAM) FD_ACCEPT); |
| 784 | |
| 785 | } |
| 786 | } |
| 787 | } else if (n == 1) { |
| 788 | reading = 0; |
| 789 | noise_ultralight(idata.len); |
| 790 | if (idata.len > 0) { |
| 791 | back->send(idata.buffer, idata.len); |
| 792 | } else { |
| 793 | back->special(TS_EOF); |
| 794 | } |
| 795 | } else if (n == 2) { |
| 796 | odata.busy = 0; |
| 797 | if (!odata.writeret) { |
| 798 | fprintf(stderr, "Unable to write to standard output\n"); |
| 799 | exit(0); |
| 800 | } |
| 801 | bufchain_consume(&stdout_data, odata.lenwritten); |
| 802 | if (bufchain_size(&stdout_data) > 0) |
| 803 | try_output(0); |
| 804 | back->unthrottle(bufchain_size(&stdout_data) + |
| 805 | bufchain_size(&stderr_data)); |
| 806 | } else if (n == 3) { |
| 807 | edata.busy = 0; |
| 808 | if (!edata.writeret) { |
| 809 | fprintf(stderr, "Unable to write to standard output\n"); |
| 810 | exit(0); |
| 811 | } |
| 812 | bufchain_consume(&stderr_data, edata.lenwritten); |
| 813 | if (bufchain_size(&stderr_data) > 0) |
| 814 | try_output(1); |
| 815 | back->unthrottle(bufchain_size(&stdout_data) + |
| 816 | bufchain_size(&stderr_data)); |
| 817 | } |
| 818 | if (!reading && back->sendbuffer() < MAX_STDIN_BACKLOG) { |
| 819 | SetEvent(idata.eventback); |
| 820 | reading = 1; |
| 821 | } |
| 822 | if (!connopen || back->socket() == NULL) |
| 823 | break; /* we closed the connection */ |
| 824 | } |
| 825 | WSACleanup(); |
| 826 | return 0; |
| 827 | } |