| 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 | /* |
| 166 | * Ask whether to wipe a session log file before writing to it. |
| 167 | * Returns 2 for wipe, 1 for append, 0 for cancel (don't log). |
| 168 | */ |
| 169 | int askappend(char *filename) |
| 170 | { |
| 171 | HANDLE hin; |
| 172 | DWORD savemode, i; |
| 173 | |
| 174 | static const char msgtemplate[] = |
| 175 | "The session log file \"%.*s\" already exists.\n" |
| 176 | "You can overwrite it with a new session log,\n" |
| 177 | "append your session log to the end of it,\n" |
| 178 | "or disable session logging for this session.\n" |
| 179 | "Enter \"y\" to wipe the file, \"n\" to append to it,\n" |
| 180 | "or just press Return to disable logging.\n" |
| 181 | "Wipe the log file? (y/n, Return cancels logging) "; |
| 182 | |
| 183 | char line[32]; |
| 184 | |
| 185 | fprintf(stderr, msgtemplate, FILENAME_MAX, filename); |
| 186 | fflush(stderr); |
| 187 | |
| 188 | hin = GetStdHandle(STD_INPUT_HANDLE); |
| 189 | GetConsoleMode(hin, &savemode); |
| 190 | SetConsoleMode(hin, (savemode | ENABLE_ECHO_INPUT | |
| 191 | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT)); |
| 192 | ReadFile(hin, line, sizeof(line) - 1, &i, NULL); |
| 193 | SetConsoleMode(hin, savemode); |
| 194 | |
| 195 | if (line[0] == 'y' || line[0] == 'Y') |
| 196 | return 2; |
| 197 | else if (line[0] == 'n' || line[0] == 'N') |
| 198 | return 1; |
| 199 | else |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * Warn about the obsolescent key file format. |
| 205 | */ |
| 206 | void old_keyfile_warning(void) |
| 207 | { |
| 208 | static const char message[] = |
| 209 | "You are loading an SSH 2 private key which has an\n" |
| 210 | "old version of the file format. This means your key\n" |
| 211 | "file is not fully tamperproof. Future versions of\n" |
| 212 | "PuTTY may stop supporting this private key format,\n" |
| 213 | "so we recommend you convert your key to the new\n" |
| 214 | "format.\n" |
| 215 | "\n" |
| 216 | "Once the key is loaded into PuTTYgen, you can perform\n" |
| 217 | "this conversion simply by saving it again.\n"; |
| 218 | |
| 219 | fputs(message, stderr); |
| 220 | } |
| 221 | |
| 222 | HANDLE inhandle, outhandle, errhandle; |
| 223 | DWORD orig_console_mode; |
| 224 | |
| 225 | WSAEVENT netevent; |
| 226 | |
| 227 | int term_ldisc(int mode) |
| 228 | { |
| 229 | return FALSE; |
| 230 | } |
| 231 | void ldisc_update(int echo, int edit) |
| 232 | { |
| 233 | /* Update stdin read mode to reflect changes in line discipline. */ |
| 234 | DWORD mode; |
| 235 | |
| 236 | mode = ENABLE_PROCESSED_INPUT; |
| 237 | if (echo) |
| 238 | mode = mode | ENABLE_ECHO_INPUT; |
| 239 | else |
| 240 | mode = mode & ~ENABLE_ECHO_INPUT; |
| 241 | if (edit) |
| 242 | mode = mode | ENABLE_LINE_INPUT; |
| 243 | else |
| 244 | mode = mode & ~ENABLE_LINE_INPUT; |
| 245 | SetConsoleMode(inhandle, mode); |
| 246 | } |
| 247 | |
| 248 | static int get_line(const char *prompt, char *str, int maxlen, int is_pw) |
| 249 | { |
| 250 | HANDLE hin, hout; |
| 251 | DWORD savemode, newmode, i; |
| 252 | |
| 253 | if (is_pw && password) { |
| 254 | static int tried_once = 0; |
| 255 | |
| 256 | if (tried_once) { |
| 257 | return 0; |
| 258 | } else { |
| 259 | strncpy(str, password, maxlen); |
| 260 | str[maxlen - 1] = '\0'; |
| 261 | tried_once = 1; |
| 262 | return 1; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | hin = GetStdHandle(STD_INPUT_HANDLE); |
| 267 | hout = GetStdHandle(STD_OUTPUT_HANDLE); |
| 268 | if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) { |
| 269 | fprintf(stderr, "Cannot get standard input/output handles"); |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | GetConsoleMode(hin, &savemode); |
| 274 | newmode = savemode | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT; |
| 275 | if (is_pw) |
| 276 | newmode &= ~ENABLE_ECHO_INPUT; |
| 277 | else |
| 278 | newmode |= ENABLE_ECHO_INPUT; |
| 279 | SetConsoleMode(hin, newmode); |
| 280 | |
| 281 | WriteFile(hout, prompt, strlen(prompt), &i, NULL); |
| 282 | ReadFile(hin, str, maxlen - 1, &i, NULL); |
| 283 | |
| 284 | SetConsoleMode(hin, savemode); |
| 285 | |
| 286 | if ((int) i > maxlen) |
| 287 | i = maxlen - 1; |
| 288 | else |
| 289 | i = i - 2; |
| 290 | str[i] = '\0'; |
| 291 | |
| 292 | if (is_pw) |
| 293 | WriteFile(hout, "\r\n", 2, &i, NULL); |
| 294 | |
| 295 | return 1; |
| 296 | } |
| 297 | |
| 298 | struct input_data { |
| 299 | DWORD len; |
| 300 | char buffer[4096]; |
| 301 | HANDLE event, eventback; |
| 302 | }; |
| 303 | |
| 304 | static DWORD WINAPI stdin_read_thread(void *param) |
| 305 | { |
| 306 | struct input_data *idata = (struct input_data *) param; |
| 307 | HANDLE inhandle; |
| 308 | |
| 309 | inhandle = GetStdHandle(STD_INPUT_HANDLE); |
| 310 | |
| 311 | while (ReadFile(inhandle, idata->buffer, sizeof(idata->buffer), |
| 312 | &idata->len, NULL) && idata->len > 0) { |
| 313 | SetEvent(idata->event); |
| 314 | WaitForSingleObject(idata->eventback, INFINITE); |
| 315 | } |
| 316 | |
| 317 | idata->len = 0; |
| 318 | SetEvent(idata->event); |
| 319 | |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | struct output_data { |
| 324 | DWORD len, lenwritten; |
| 325 | int writeret; |
| 326 | char *buffer; |
| 327 | int is_stderr, done; |
| 328 | HANDLE event, eventback; |
| 329 | int busy; |
| 330 | }; |
| 331 | |
| 332 | static DWORD WINAPI stdout_write_thread(void *param) |
| 333 | { |
| 334 | struct output_data *odata = (struct output_data *) param; |
| 335 | HANDLE outhandle, errhandle; |
| 336 | |
| 337 | outhandle = GetStdHandle(STD_OUTPUT_HANDLE); |
| 338 | errhandle = GetStdHandle(STD_ERROR_HANDLE); |
| 339 | |
| 340 | while (1) { |
| 341 | WaitForSingleObject(odata->eventback, INFINITE); |
| 342 | if (odata->done) |
| 343 | break; |
| 344 | odata->writeret = |
| 345 | WriteFile(odata->is_stderr ? errhandle : outhandle, |
| 346 | odata->buffer, odata->len, &odata->lenwritten, NULL); |
| 347 | SetEvent(odata->event); |
| 348 | } |
| 349 | |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | bufchain stdout_data, stderr_data; |
| 354 | struct output_data odata, edata; |
| 355 | |
| 356 | void try_output(int is_stderr) |
| 357 | { |
| 358 | struct output_data *data = (is_stderr ? &edata : &odata); |
| 359 | void *senddata; |
| 360 | int sendlen; |
| 361 | |
| 362 | if (!data->busy) { |
| 363 | bufchain_prefix(is_stderr ? &stderr_data : &stdout_data, |
| 364 | &senddata, &sendlen); |
| 365 | data->buffer = senddata; |
| 366 | data->len = sendlen; |
| 367 | SetEvent(data->eventback); |
| 368 | data->busy = 1; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | int from_backend(int is_stderr, char *data, int len) |
| 373 | { |
| 374 | HANDLE h = (is_stderr ? errhandle : outhandle); |
| 375 | int osize, esize; |
| 376 | |
| 377 | if (is_stderr) { |
| 378 | bufchain_add(&stderr_data, data, len); |
| 379 | try_output(1); |
| 380 | } else { |
| 381 | bufchain_add(&stdout_data, data, len); |
| 382 | try_output(0); |
| 383 | } |
| 384 | |
| 385 | osize = bufchain_size(&stdout_data); |
| 386 | esize = bufchain_size(&stderr_data); |
| 387 | |
| 388 | return osize + esize; |
| 389 | } |
| 390 | |
| 391 | /* |
| 392 | * Short description of parameters. |
| 393 | */ |
| 394 | static void usage(void) |
| 395 | { |
| 396 | printf("PuTTY Link: command-line connection utility\n"); |
| 397 | printf("%s\n", ver); |
| 398 | printf("Usage: plink [options] [user@]host [command]\n"); |
| 399 | printf(" (\"host\" can also be a PuTTY saved session name)\n"); |
| 400 | printf("Options:\n"); |
| 401 | printf(" -v show verbose messages\n"); |
| 402 | printf(" -ssh force use of ssh protocol\n"); |
| 403 | printf(" -P port connect to specified port\n"); |
| 404 | printf(" -pw passw login with specified password\n"); |
| 405 | printf(" -m file read remote command(s) from file\n"); |
| 406 | printf(" -L listen-port:host:port Forward local port to " |
| 407 | "remote address\n"); |
| 408 | printf(" -R listen-port:host:port Forward remote port to" |
| 409 | " local address\n"); |
| 410 | exit(1); |
| 411 | } |
| 412 | |
| 413 | char *do_select(SOCKET skt, int startup) |
| 414 | { |
| 415 | int events; |
| 416 | if (startup) { |
| 417 | events = (FD_CONNECT | FD_READ | FD_WRITE | |
| 418 | FD_OOB | FD_CLOSE | FD_ACCEPT); |
| 419 | } else { |
| 420 | events = 0; |
| 421 | } |
| 422 | if (WSAEventSelect(skt, netevent, events) == SOCKET_ERROR) { |
| 423 | switch (WSAGetLastError()) { |
| 424 | case WSAENETDOWN: |
| 425 | return "Network is down"; |
| 426 | default: |
| 427 | return "WSAAsyncSelect(): unknown error"; |
| 428 | } |
| 429 | } |
| 430 | return NULL; |
| 431 | } |
| 432 | |
| 433 | int main(int argc, char **argv) |
| 434 | { |
| 435 | WSADATA wsadata; |
| 436 | WORD winsock_ver; |
| 437 | WSAEVENT stdinevent, stdoutevent, stderrevent; |
| 438 | HANDLE handles[4]; |
| 439 | DWORD in_threadid, out_threadid, err_threadid; |
| 440 | struct input_data idata; |
| 441 | int reading; |
| 442 | int sending; |
| 443 | int portnumber = -1; |
| 444 | SOCKET *sklist; |
| 445 | int skcount, sksize; |
| 446 | int connopen; |
| 447 | int exitcode; |
| 448 | char extra_portfwd[sizeof(cfg.portfwd)]; |
| 449 | |
| 450 | ssh_get_line = get_line; |
| 451 | |
| 452 | sklist = NULL; |
| 453 | skcount = sksize = 0; |
| 454 | /* |
| 455 | * Initialise port and protocol to sensible defaults. (These |
| 456 | * will be overridden by more or less anything.) |
| 457 | */ |
| 458 | default_protocol = PROT_SSH; |
| 459 | default_port = 22; |
| 460 | |
| 461 | flags = FLAG_STDERR; |
| 462 | /* |
| 463 | * Process the command line. |
| 464 | */ |
| 465 | do_defaults(NULL, &cfg); |
| 466 | default_protocol = cfg.protocol; |
| 467 | default_port = cfg.port; |
| 468 | { |
| 469 | /* |
| 470 | * Override the default protocol if PLINK_PROTOCOL is set. |
| 471 | */ |
| 472 | char *p = getenv("PLINK_PROTOCOL"); |
| 473 | int i; |
| 474 | if (p) { |
| 475 | for (i = 0; backends[i].backend != NULL; i++) { |
| 476 | if (!strcmp(backends[i].name, p)) { |
| 477 | default_protocol = cfg.protocol = backends[i].protocol; |
| 478 | default_port = cfg.port = |
| 479 | backends[i].backend->default_port; |
| 480 | break; |
| 481 | } |
| 482 | } |
| 483 | } |
| 484 | } |
| 485 | while (--argc) { |
| 486 | char *p = *++argv; |
| 487 | if (*p == '-') { |
| 488 | if (!strcmp(p, "-ssh")) { |
| 489 | default_protocol = cfg.protocol = PROT_SSH; |
| 490 | default_port = cfg.port = 22; |
| 491 | } else if (!strcmp(p, "-telnet")) { |
| 492 | default_protocol = cfg.protocol = PROT_TELNET; |
| 493 | default_port = cfg.port = 23; |
| 494 | } else if (!strcmp(p, "-rlogin")) { |
| 495 | default_protocol = cfg.protocol = PROT_RLOGIN; |
| 496 | default_port = cfg.port = 513; |
| 497 | } else if (!strcmp(p, "-raw")) { |
| 498 | default_protocol = cfg.protocol = PROT_RAW; |
| 499 | } else if (!strcmp(p, "-v")) { |
| 500 | flags |= FLAG_VERBOSE; |
| 501 | } else if (!strcmp(p, "-log")) { |
| 502 | logfile = "putty.log"; |
| 503 | } else if (!strcmp(p, "-pw") && argc > 1) { |
| 504 | --argc, password = *++argv; |
| 505 | } else if (!strcmp(p, "-l") && argc > 1) { |
| 506 | char *username; |
| 507 | --argc, username = *++argv; |
| 508 | strncpy(cfg.username, username, sizeof(cfg.username)); |
| 509 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
| 510 | } else if ((!strcmp(p, "-L") || !strcmp(p, "-R")) && argc > 1) { |
| 511 | char *fwd, *ptr, *q; |
| 512 | int i=0; |
| 513 | --argc, fwd = *++argv; |
| 514 | ptr = extra_portfwd; |
| 515 | /* if multiple forwards, find end of list */ |
| 516 | if (ptr[0]=='R' || ptr[0]=='L') { |
| 517 | for (i = 0; i < sizeof(extra_portfwd) - 2; i++) |
| 518 | if (ptr[i]=='\000' && ptr[i+1]=='\000') |
| 519 | break; |
| 520 | ptr = ptr + i + 1; /* point to next forward slot */ |
| 521 | } |
| 522 | ptr[0] = p[1]; /* insert a 'L' or 'R' at the start */ |
| 523 | strncpy(ptr+1, fwd, sizeof(extra_portfwd) - i); |
| 524 | q = strchr(ptr, ':'); |
| 525 | if (q) *q = '\t'; /* replace first : with \t */ |
| 526 | ptr[strlen(ptr)+1] = '\000'; /* append two '\000' */ |
| 527 | extra_portfwd[sizeof(extra_portfwd) - 1] = '\0'; |
| 528 | } else if (!strcmp(p, "-m") && argc > 1) { |
| 529 | char *filename, *command; |
| 530 | int cmdlen, cmdsize; |
| 531 | FILE *fp; |
| 532 | int c, d; |
| 533 | |
| 534 | --argc, filename = *++argv; |
| 535 | |
| 536 | cmdlen = cmdsize = 0; |
| 537 | command = NULL; |
| 538 | fp = fopen(filename, "r"); |
| 539 | if (!fp) { |
| 540 | fprintf(stderr, "plink: unable to open command " |
| 541 | "file \"%s\"\n", filename); |
| 542 | return 1; |
| 543 | } |
| 544 | do { |
| 545 | c = fgetc(fp); |
| 546 | d = c; |
| 547 | if (c == EOF) |
| 548 | d = 0; |
| 549 | if (cmdlen >= cmdsize) { |
| 550 | cmdsize = cmdlen + 512; |
| 551 | command = srealloc(command, cmdsize); |
| 552 | } |
| 553 | command[cmdlen++] = d; |
| 554 | } while (c != EOF); |
| 555 | cfg.remote_cmd_ptr = command; |
| 556 | cfg.remote_cmd_ptr2 = NULL; |
| 557 | cfg.nopty = TRUE; /* command => no terminal */ |
| 558 | } else if (!strcmp(p, "-P") && argc > 1) { |
| 559 | --argc, portnumber = atoi(*++argv); |
| 560 | } |
| 561 | } else if (*p) { |
| 562 | if (!*cfg.host) { |
| 563 | char *q = p; |
| 564 | /* |
| 565 | * If the hostname starts with "telnet:", set the |
| 566 | * protocol to Telnet and process the string as a |
| 567 | * Telnet URL. |
| 568 | */ |
| 569 | if (!strncmp(q, "telnet:", 7)) { |
| 570 | char c; |
| 571 | |
| 572 | q += 7; |
| 573 | if (q[0] == '/' && q[1] == '/') |
| 574 | q += 2; |
| 575 | cfg.protocol = PROT_TELNET; |
| 576 | p = q; |
| 577 | while (*p && *p != ':' && *p != '/') |
| 578 | p++; |
| 579 | c = *p; |
| 580 | if (*p) |
| 581 | *p++ = '\0'; |
| 582 | if (c == ':') |
| 583 | cfg.port = atoi(p); |
| 584 | else |
| 585 | cfg.port = -1; |
| 586 | strncpy(cfg.host, q, sizeof(cfg.host) - 1); |
| 587 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
| 588 | } else { |
| 589 | char *r; |
| 590 | /* |
| 591 | * Before we process the [user@]host string, we |
| 592 | * first check for the presence of a protocol |
| 593 | * prefix (a protocol name followed by ","). |
| 594 | */ |
| 595 | r = strchr(p, ','); |
| 596 | if (r) { |
| 597 | int i, j; |
| 598 | for (i = 0; backends[i].backend != NULL; i++) { |
| 599 | j = strlen(backends[i].name); |
| 600 | if (j == r - p && |
| 601 | !memcmp(backends[i].name, p, j)) { |
| 602 | default_protocol = cfg.protocol = |
| 603 | backends[i].protocol; |
| 604 | portnumber = |
| 605 | backends[i].backend->default_port; |
| 606 | p = r + 1; |
| 607 | break; |
| 608 | } |
| 609 | } |
| 610 | } |
| 611 | |
| 612 | /* |
| 613 | * Three cases. Either (a) there's a nonzero |
| 614 | * length string followed by an @, in which |
| 615 | * case that's user and the remainder is host. |
| 616 | * Or (b) there's only one string, not counting |
| 617 | * a potential initial @, and it exists in the |
| 618 | * saved-sessions database. Or (c) only one |
| 619 | * string and it _doesn't_ exist in the |
| 620 | * database. |
| 621 | */ |
| 622 | r = strrchr(p, '@'); |
| 623 | if (r == p) |
| 624 | p++, r = NULL; /* discount initial @ */ |
| 625 | if (r == NULL) { |
| 626 | /* |
| 627 | * One string. |
| 628 | */ |
| 629 | Config cfg2; |
| 630 | do_defaults(p, &cfg2); |
| 631 | if (cfg2.host[0] == '\0') { |
| 632 | /* No settings for this host; use defaults */ |
| 633 | strncpy(cfg.host, p, sizeof(cfg.host) - 1); |
| 634 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
| 635 | cfg.port = default_port; |
| 636 | } else { |
| 637 | cfg = cfg2; |
| 638 | cfg.remote_cmd_ptr = cfg.remote_cmd; |
| 639 | } |
| 640 | } else { |
| 641 | *r++ = '\0'; |
| 642 | strncpy(cfg.username, p, sizeof(cfg.username) - 1); |
| 643 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
| 644 | strncpy(cfg.host, r, sizeof(cfg.host) - 1); |
| 645 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
| 646 | cfg.port = default_port; |
| 647 | } |
| 648 | } |
| 649 | } else { |
| 650 | int len = sizeof(cfg.remote_cmd) - 1; |
| 651 | char *cp = cfg.remote_cmd; |
| 652 | int len2; |
| 653 | |
| 654 | strncpy(cp, p, len); |
| 655 | cp[len] = '\0'; |
| 656 | len2 = strlen(cp); |
| 657 | len -= len2; |
| 658 | cp += len2; |
| 659 | while (--argc) { |
| 660 | if (len > 0) |
| 661 | len--, *cp++ = ' '; |
| 662 | strncpy(cp, *++argv, len); |
| 663 | cp[len] = '\0'; |
| 664 | len2 = strlen(cp); |
| 665 | len -= len2; |
| 666 | cp += len2; |
| 667 | } |
| 668 | cfg.nopty = TRUE; /* command => no terminal */ |
| 669 | break; /* done with cmdline */ |
| 670 | } |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | if (!*cfg.host) { |
| 675 | usage(); |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * Trim leading whitespace off the hostname if it's there. |
| 680 | */ |
| 681 | { |
| 682 | int space = strspn(cfg.host, " \t"); |
| 683 | memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space); |
| 684 | } |
| 685 | |
| 686 | /* See if host is of the form user@host */ |
| 687 | if (cfg.host[0] != '\0') { |
| 688 | char *atsign = strchr(cfg.host, '@'); |
| 689 | /* Make sure we're not overflowing the user field */ |
| 690 | if (atsign) { |
| 691 | if (atsign - cfg.host < sizeof cfg.username) { |
| 692 | strncpy(cfg.username, cfg.host, atsign - cfg.host); |
| 693 | cfg.username[atsign - cfg.host] = '\0'; |
| 694 | } |
| 695 | memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1)); |
| 696 | } |
| 697 | } |
| 698 | |
| 699 | /* |
| 700 | * Trim a colon suffix off the hostname if it's there. |
| 701 | */ |
| 702 | cfg.host[strcspn(cfg.host, ":")] = '\0'; |
| 703 | |
| 704 | if (!*cfg.remote_cmd_ptr) |
| 705 | flags |= FLAG_INTERACTIVE; |
| 706 | |
| 707 | /* |
| 708 | * Select protocol. This is farmed out into a table in a |
| 709 | * separate file to enable an ssh-free variant. |
| 710 | */ |
| 711 | { |
| 712 | int i; |
| 713 | back = NULL; |
| 714 | for (i = 0; backends[i].backend != NULL; i++) |
| 715 | if (backends[i].protocol == cfg.protocol) { |
| 716 | back = backends[i].backend; |
| 717 | break; |
| 718 | } |
| 719 | if (back == NULL) { |
| 720 | fprintf(stderr, |
| 721 | "Internal fault: Unsupported protocol found\n"); |
| 722 | return 1; |
| 723 | } |
| 724 | } |
| 725 | |
| 726 | /* |
| 727 | * Add extra port forwardings (accumulated on command line) to |
| 728 | * cfg. |
| 729 | */ |
| 730 | { |
| 731 | int i; |
| 732 | char *p; |
| 733 | p = extra_portfwd; |
| 734 | i = 0; |
| 735 | while (cfg.portfwd[i]) |
| 736 | i += strlen(cfg.portfwd+i) + 1; |
| 737 | while (*p) { |
| 738 | if (strlen(p)+2 > sizeof(cfg.portfwd)-i) { |
| 739 | fprintf(stderr, "Internal fault: not enough space for all" |
| 740 | " port forwardings\n"); |
| 741 | break; |
| 742 | } |
| 743 | strncpy(cfg.portfwd+i, p, sizeof(cfg.portfwd)-i-1); |
| 744 | i += strlen(cfg.portfwd+i) + 1; |
| 745 | cfg.portfwd[i] = '\0'; |
| 746 | p += strlen(p)+1; |
| 747 | } |
| 748 | } |
| 749 | |
| 750 | /* |
| 751 | * Select port. |
| 752 | */ |
| 753 | if (portnumber != -1) |
| 754 | cfg.port = portnumber; |
| 755 | |
| 756 | /* |
| 757 | * Initialise WinSock. |
| 758 | */ |
| 759 | winsock_ver = MAKEWORD(2, 0); |
| 760 | if (WSAStartup(winsock_ver, &wsadata)) { |
| 761 | MessageBox(NULL, "Unable to initialise WinSock", "WinSock Error", |
| 762 | MB_OK | MB_ICONEXCLAMATION); |
| 763 | return 1; |
| 764 | } |
| 765 | if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wVersion) != 0) { |
| 766 | MessageBox(NULL, "WinSock version is incompatible with 2.0", |
| 767 | "WinSock Error", MB_OK | MB_ICONEXCLAMATION); |
| 768 | WSACleanup(); |
| 769 | return 1; |
| 770 | } |
| 771 | sk_init(); |
| 772 | |
| 773 | /* |
| 774 | * Start up the connection. |
| 775 | */ |
| 776 | netevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 777 | { |
| 778 | char *error; |
| 779 | char *realhost; |
| 780 | /* nodelay is only useful if stdin is a character device (console) */ |
| 781 | int nodelay = cfg.tcp_nodelay && |
| 782 | (GetFileType(GetStdHandle(STD_INPUT_HANDLE)) == FILE_TYPE_CHAR); |
| 783 | |
| 784 | error = back->init(cfg.host, cfg.port, &realhost, nodelay); |
| 785 | if (error) { |
| 786 | fprintf(stderr, "Unable to open connection:\n%s", error); |
| 787 | return 1; |
| 788 | } |
| 789 | sfree(realhost); |
| 790 | } |
| 791 | connopen = 1; |
| 792 | |
| 793 | stdinevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 794 | stdoutevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 795 | stderrevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 796 | |
| 797 | inhandle = GetStdHandle(STD_INPUT_HANDLE); |
| 798 | outhandle = GetStdHandle(STD_OUTPUT_HANDLE); |
| 799 | errhandle = GetStdHandle(STD_ERROR_HANDLE); |
| 800 | GetConsoleMode(inhandle, &orig_console_mode); |
| 801 | SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT); |
| 802 | |
| 803 | /* |
| 804 | * Turn off ECHO and LINE input modes. We don't care if this |
| 805 | * call fails, because we know we aren't necessarily running in |
| 806 | * a console. |
| 807 | */ |
| 808 | handles[0] = netevent; |
| 809 | handles[1] = stdinevent; |
| 810 | handles[2] = stdoutevent; |
| 811 | handles[3] = stderrevent; |
| 812 | sending = FALSE; |
| 813 | |
| 814 | /* |
| 815 | * Create spare threads to write to stdout and stderr, so we |
| 816 | * can arrange asynchronous writes. |
| 817 | */ |
| 818 | odata.event = stdoutevent; |
| 819 | odata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 820 | odata.is_stderr = 0; |
| 821 | odata.busy = odata.done = 0; |
| 822 | if (!CreateThread(NULL, 0, stdout_write_thread, |
| 823 | &odata, 0, &out_threadid)) { |
| 824 | fprintf(stderr, "Unable to create output thread\n"); |
| 825 | exit(1); |
| 826 | } |
| 827 | edata.event = stderrevent; |
| 828 | edata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 829 | edata.is_stderr = 1; |
| 830 | edata.busy = edata.done = 0; |
| 831 | if (!CreateThread(NULL, 0, stdout_write_thread, |
| 832 | &edata, 0, &err_threadid)) { |
| 833 | fprintf(stderr, "Unable to create error output thread\n"); |
| 834 | exit(1); |
| 835 | } |
| 836 | |
| 837 | while (1) { |
| 838 | int n; |
| 839 | |
| 840 | if (!sending && back->sendok()) { |
| 841 | /* |
| 842 | * Create a separate thread to read from stdin. This is |
| 843 | * a total pain, but I can't find another way to do it: |
| 844 | * |
| 845 | * - an overlapped ReadFile or ReadFileEx just doesn't |
| 846 | * happen; we get failure from ReadFileEx, and |
| 847 | * ReadFile blocks despite being given an OVERLAPPED |
| 848 | * structure. Perhaps we can't do overlapped reads |
| 849 | * on consoles. WHY THE HELL NOT? |
| 850 | * |
| 851 | * - WaitForMultipleObjects(netevent, console) doesn't |
| 852 | * work, because it signals the console when |
| 853 | * _anything_ happens, including mouse motions and |
| 854 | * other things that don't cause data to be readable |
| 855 | * - so we're back to ReadFile blocking. |
| 856 | */ |
| 857 | idata.event = stdinevent; |
| 858 | idata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 859 | if (!CreateThread(NULL, 0, stdin_read_thread, |
| 860 | &idata, 0, &in_threadid)) { |
| 861 | fprintf(stderr, "Unable to create input thread\n"); |
| 862 | exit(1); |
| 863 | } |
| 864 | sending = TRUE; |
| 865 | } |
| 866 | |
| 867 | n = WaitForMultipleObjects(4, handles, FALSE, INFINITE); |
| 868 | if (n == 0) { |
| 869 | WSANETWORKEVENTS things; |
| 870 | SOCKET socket; |
| 871 | extern SOCKET first_socket(int *), next_socket(int *); |
| 872 | extern int select_result(WPARAM, LPARAM); |
| 873 | int i, socketstate; |
| 874 | |
| 875 | /* |
| 876 | * We must not call select_result() for any socket |
| 877 | * until we have finished enumerating within the tree. |
| 878 | * This is because select_result() may close the socket |
| 879 | * and modify the tree. |
| 880 | */ |
| 881 | /* Count the active sockets. */ |
| 882 | i = 0; |
| 883 | for (socket = first_socket(&socketstate); |
| 884 | socket != INVALID_SOCKET; |
| 885 | socket = next_socket(&socketstate)) i++; |
| 886 | |
| 887 | /* Expand the buffer if necessary. */ |
| 888 | if (i > sksize) { |
| 889 | sksize = i + 16; |
| 890 | sklist = srealloc(sklist, sksize * sizeof(*sklist)); |
| 891 | } |
| 892 | |
| 893 | /* Retrieve the sockets into sklist. */ |
| 894 | skcount = 0; |
| 895 | for (socket = first_socket(&socketstate); |
| 896 | socket != INVALID_SOCKET; |
| 897 | socket = next_socket(&socketstate)) { |
| 898 | sklist[skcount++] = socket; |
| 899 | } |
| 900 | |
| 901 | /* Now we're done enumerating; go through the list. */ |
| 902 | for (i = 0; i < skcount; i++) { |
| 903 | WPARAM wp; |
| 904 | socket = sklist[i]; |
| 905 | wp = (WPARAM) socket; |
| 906 | if (!WSAEnumNetworkEvents(socket, NULL, &things)) { |
| 907 | noise_ultralight(socket); |
| 908 | noise_ultralight(things.lNetworkEvents); |
| 909 | if (things.lNetworkEvents & FD_CONNECT) |
| 910 | connopen &= select_result(wp, (LPARAM) FD_CONNECT); |
| 911 | if (things.lNetworkEvents & FD_READ) |
| 912 | connopen &= select_result(wp, (LPARAM) FD_READ); |
| 913 | if (things.lNetworkEvents & FD_CLOSE) |
| 914 | connopen &= select_result(wp, (LPARAM) FD_CLOSE); |
| 915 | if (things.lNetworkEvents & FD_OOB) |
| 916 | connopen &= select_result(wp, (LPARAM) FD_OOB); |
| 917 | if (things.lNetworkEvents & FD_WRITE) |
| 918 | connopen &= select_result(wp, (LPARAM) FD_WRITE); |
| 919 | if (things.lNetworkEvents & FD_ACCEPT) |
| 920 | connopen &= select_result(wp, (LPARAM) FD_ACCEPT); |
| 921 | |
| 922 | } |
| 923 | } |
| 924 | } else if (n == 1) { |
| 925 | reading = 0; |
| 926 | noise_ultralight(idata.len); |
| 927 | if (connopen && back->socket() != NULL) { |
| 928 | if (idata.len > 0) { |
| 929 | back->send(idata.buffer, idata.len); |
| 930 | } else { |
| 931 | back->special(TS_EOF); |
| 932 | } |
| 933 | } |
| 934 | } else if (n == 2) { |
| 935 | odata.busy = 0; |
| 936 | if (!odata.writeret) { |
| 937 | fprintf(stderr, "Unable to write to standard output\n"); |
| 938 | exit(0); |
| 939 | } |
| 940 | bufchain_consume(&stdout_data, odata.lenwritten); |
| 941 | if (bufchain_size(&stdout_data) > 0) |
| 942 | try_output(0); |
| 943 | if (connopen && back->socket() != NULL) { |
| 944 | back->unthrottle(bufchain_size(&stdout_data) + |
| 945 | bufchain_size(&stderr_data)); |
| 946 | } |
| 947 | } else if (n == 3) { |
| 948 | edata.busy = 0; |
| 949 | if (!edata.writeret) { |
| 950 | fprintf(stderr, "Unable to write to standard output\n"); |
| 951 | exit(0); |
| 952 | } |
| 953 | bufchain_consume(&stderr_data, edata.lenwritten); |
| 954 | if (bufchain_size(&stderr_data) > 0) |
| 955 | try_output(1); |
| 956 | if (connopen && back->socket() != NULL) { |
| 957 | back->unthrottle(bufchain_size(&stdout_data) + |
| 958 | bufchain_size(&stderr_data)); |
| 959 | } |
| 960 | } |
| 961 | if (!reading && back->sendbuffer() < MAX_STDIN_BACKLOG) { |
| 962 | SetEvent(idata.eventback); |
| 963 | reading = 1; |
| 964 | } |
| 965 | if ((!connopen || back->socket() == NULL) && |
| 966 | bufchain_size(&stdout_data) == 0 && |
| 967 | bufchain_size(&stderr_data) == 0) |
| 968 | break; /* we closed the connection */ |
| 969 | } |
| 970 | WSACleanup(); |
| 971 | exitcode = back->exitcode(); |
| 972 | if (exitcode < 0) { |
| 973 | fprintf(stderr, "Remote process exit code unavailable\n"); |
| 974 | exitcode = 1; /* this is an error condition */ |
| 975 | } |
| 976 | return exitcode; |
| 977 | } |