| 1 | /* |
| 2 | * PLink - a command-line (stdin/stdout) variant of PuTTY. |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <errno.h> |
| 8 | #include <assert.h> |
| 9 | #include <stdarg.h> |
| 10 | #include <signal.h> |
| 11 | #include <unistd.h> |
| 12 | #include <fcntl.h> |
| 13 | #include <termios.h> |
| 14 | #include <pwd.h> |
| 15 | #include <sys/ioctl.h> |
| 16 | |
| 17 | /* More helpful version of the FD_SET macro, to also handle maxfd. */ |
| 18 | #define FD_SET_MAX(fd, max, set) do { \ |
| 19 | FD_SET(fd, &set); \ |
| 20 | if (max < fd + 1) max = fd + 1; \ |
| 21 | } while (0) |
| 22 | |
| 23 | #define PUTTY_DO_GLOBALS /* actually _define_ globals */ |
| 24 | #include "putty.h" |
| 25 | #include "storage.h" |
| 26 | #include "tree234.h" |
| 27 | |
| 28 | #define MAX_STDIN_BACKLOG 4096 |
| 29 | |
| 30 | void fatalbox(char *p, ...) |
| 31 | { |
| 32 | va_list ap; |
| 33 | fprintf(stderr, "FATAL ERROR: "); |
| 34 | va_start(ap, p); |
| 35 | vfprintf(stderr, p, ap); |
| 36 | va_end(ap); |
| 37 | fputc('\n', stderr); |
| 38 | cleanup_exit(1); |
| 39 | } |
| 40 | void modalfatalbox(char *p, ...) |
| 41 | { |
| 42 | va_list ap; |
| 43 | fprintf(stderr, "FATAL ERROR: "); |
| 44 | va_start(ap, p); |
| 45 | vfprintf(stderr, p, ap); |
| 46 | va_end(ap); |
| 47 | fputc('\n', stderr); |
| 48 | cleanup_exit(1); |
| 49 | } |
| 50 | void connection_fatal(void *frontend, char *p, ...) |
| 51 | { |
| 52 | va_list ap; |
| 53 | fprintf(stderr, "FATAL ERROR: "); |
| 54 | va_start(ap, p); |
| 55 | vfprintf(stderr, p, ap); |
| 56 | va_end(ap); |
| 57 | fputc('\n', stderr); |
| 58 | cleanup_exit(1); |
| 59 | } |
| 60 | void cmdline_error(char *p, ...) |
| 61 | { |
| 62 | va_list ap; |
| 63 | fprintf(stderr, "plink: "); |
| 64 | va_start(ap, p); |
| 65 | vfprintf(stderr, p, ap); |
| 66 | va_end(ap); |
| 67 | fputc('\n', stderr); |
| 68 | exit(1); |
| 69 | } |
| 70 | |
| 71 | struct termios orig_termios; |
| 72 | |
| 73 | static Backend *back; |
| 74 | static void *backhandle; |
| 75 | |
| 76 | /* |
| 77 | * Default settings that are specific to pterm. |
| 78 | */ |
| 79 | char *platform_default_s(char *name) |
| 80 | { |
| 81 | if (!strcmp(name, "X11Display")) |
| 82 | return getenv("DISPLAY"); |
| 83 | if (!strcmp(name, "TermType")) |
| 84 | return getenv("TERM"); |
| 85 | if (!strcmp(name, "UserName")) { |
| 86 | /* |
| 87 | * Remote login username will default to the local username. |
| 88 | */ |
| 89 | struct passwd *p; |
| 90 | uid_t uid = getuid(); |
| 91 | char *user, *ret = NULL; |
| 92 | |
| 93 | /* |
| 94 | * First, find who we think we are using getlogin. If this |
| 95 | * agrees with our uid, we'll go along with it. This should |
| 96 | * allow sharing of uids between several login names whilst |
| 97 | * coping correctly with people who have su'ed. |
| 98 | */ |
| 99 | user = getlogin(); |
| 100 | setpwent(); |
| 101 | if (user) |
| 102 | p = getpwnam(user); |
| 103 | else |
| 104 | p = NULL; |
| 105 | if (p && p->pw_uid == uid) { |
| 106 | /* |
| 107 | * The result of getlogin() really does correspond to |
| 108 | * our uid. Fine. |
| 109 | */ |
| 110 | ret = user; |
| 111 | } else { |
| 112 | /* |
| 113 | * If that didn't work, for whatever reason, we'll do |
| 114 | * the simpler version: look up our uid in the password |
| 115 | * file and map it straight to a name. |
| 116 | */ |
| 117 | p = getpwuid(uid); |
| 118 | ret = p->pw_name; |
| 119 | } |
| 120 | endpwent(); |
| 121 | |
| 122 | return ret; |
| 123 | } |
| 124 | return NULL; |
| 125 | } |
| 126 | |
| 127 | int platform_default_i(char *name, int def) |
| 128 | { |
| 129 | if (!strcmp(name, "TermWidth") || |
| 130 | !strcmp(name, "TermHeight")) { |
| 131 | struct winsize size; |
| 132 | if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0) |
| 133 | return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row); |
| 134 | } |
| 135 | return def; |
| 136 | } |
| 137 | |
| 138 | char *x_get_default(char *key) |
| 139 | { |
| 140 | return NULL; /* this is a stub */ |
| 141 | } |
| 142 | int term_ldisc(Terminal *term, int mode) |
| 143 | { |
| 144 | return FALSE; |
| 145 | } |
| 146 | void ldisc_update(void *frontend, int echo, int edit) |
| 147 | { |
| 148 | /* Update stdin read mode to reflect changes in line discipline. */ |
| 149 | struct termios mode; |
| 150 | |
| 151 | mode = orig_termios; |
| 152 | |
| 153 | if (echo) |
| 154 | mode.c_lflag |= ECHO; |
| 155 | else |
| 156 | mode.c_lflag &= ~ECHO; |
| 157 | |
| 158 | if (edit) |
| 159 | mode.c_lflag |= ISIG | ICANON; |
| 160 | else |
| 161 | mode.c_lflag &= ~(ISIG | ICANON); |
| 162 | |
| 163 | tcsetattr(0, TCSANOW, &mode); |
| 164 | } |
| 165 | |
| 166 | void cleanup_termios(void) |
| 167 | { |
| 168 | tcsetattr(0, TCSANOW, &orig_termios); |
| 169 | } |
| 170 | |
| 171 | bufchain stdout_data, stderr_data; |
| 172 | |
| 173 | void try_output(int is_stderr) |
| 174 | { |
| 175 | bufchain *chain = (is_stderr ? &stderr_data : &stdout_data); |
| 176 | int fd = (is_stderr ? 2 : 1); |
| 177 | void *senddata; |
| 178 | int sendlen, ret; |
| 179 | |
| 180 | if (bufchain_size(chain) == 0) |
| 181 | return; |
| 182 | |
| 183 | bufchain_prefix(chain, &senddata, &sendlen); |
| 184 | ret = write(fd, senddata, sendlen); |
| 185 | if (ret > 0) |
| 186 | bufchain_consume(chain, ret); |
| 187 | else if (ret < 0) { |
| 188 | perror(is_stderr ? "stderr: write" : "stdout: write"); |
| 189 | exit(1); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | int from_backend(void *frontend_handle, int is_stderr, char *data, int len) |
| 194 | { |
| 195 | int osize, esize; |
| 196 | |
| 197 | assert(len > 0); |
| 198 | |
| 199 | if (is_stderr) { |
| 200 | bufchain_add(&stderr_data, data, len); |
| 201 | try_output(1); |
| 202 | } else { |
| 203 | bufchain_add(&stdout_data, data, len); |
| 204 | try_output(0); |
| 205 | } |
| 206 | |
| 207 | osize = bufchain_size(&stdout_data); |
| 208 | esize = bufchain_size(&stderr_data); |
| 209 | |
| 210 | return osize + esize; |
| 211 | } |
| 212 | |
| 213 | int signalpipe[2]; |
| 214 | |
| 215 | void sigwinch(int signum) |
| 216 | { |
| 217 | write(signalpipe[1], "x", 1); |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Short description of parameters. |
| 222 | */ |
| 223 | static void usage(void) |
| 224 | { |
| 225 | printf("PuTTY Link: command-line connection utility\n"); |
| 226 | printf("%s\n", ver); |
| 227 | printf("Usage: plink [options] [user@]host [command]\n"); |
| 228 | printf(" (\"host\" can also be a PuTTY saved session name)\n"); |
| 229 | printf("Options:\n"); |
| 230 | printf(" -v show verbose messages\n"); |
| 231 | printf(" -load sessname Load settings from saved session\n"); |
| 232 | printf(" -ssh -telnet -rlogin -raw\n"); |
| 233 | printf(" force use of a particular protocol (default SSH)\n"); |
| 234 | printf(" -P port connect to specified port\n"); |
| 235 | printf(" -l user connect with specified username\n"); |
| 236 | printf(" -m file read remote command(s) from file\n"); |
| 237 | printf(" -batch disable all interactive prompts\n"); |
| 238 | printf("The following options only apply to SSH connections:\n"); |
| 239 | printf(" -pw passw login with specified password\n"); |
| 240 | printf(" -L listen-port:host:port Forward local port to " |
| 241 | "remote address\n"); |
| 242 | printf(" -R listen-port:host:port Forward remote port to" |
| 243 | " local address\n"); |
| 244 | printf(" -X -x enable / disable X11 forwarding\n"); |
| 245 | printf(" -A -a enable / disable agent forwarding\n"); |
| 246 | printf(" -t -T enable / disable pty allocation\n"); |
| 247 | printf(" -1 -2 force use of particular protocol version\n"); |
| 248 | printf(" -C enable compression\n"); |
| 249 | printf(" -i key private key file for authentication\n"); |
| 250 | exit(1); |
| 251 | } |
| 252 | |
| 253 | int main(int argc, char **argv) |
| 254 | { |
| 255 | int sending; |
| 256 | int portnumber = -1; |
| 257 | int *sklist; |
| 258 | int socket; |
| 259 | int i, skcount, sksize, socketstate; |
| 260 | int connopen; |
| 261 | int exitcode; |
| 262 | int errors; |
| 263 | void *ldisc; |
| 264 | |
| 265 | ssh_get_line = console_get_line; |
| 266 | |
| 267 | sklist = NULL; |
| 268 | skcount = sksize = 0; |
| 269 | /* |
| 270 | * Initialise port and protocol to sensible defaults. (These |
| 271 | * will be overridden by more or less anything.) |
| 272 | */ |
| 273 | default_protocol = PROT_SSH; |
| 274 | default_port = 22; |
| 275 | |
| 276 | flags = FLAG_STDERR; |
| 277 | /* |
| 278 | * Process the command line. |
| 279 | */ |
| 280 | do_defaults(NULL, &cfg); |
| 281 | default_protocol = cfg.protocol; |
| 282 | default_port = cfg.port; |
| 283 | errors = 0; |
| 284 | { |
| 285 | /* |
| 286 | * Override the default protocol if PLINK_PROTOCOL is set. |
| 287 | */ |
| 288 | char *p = getenv("PLINK_PROTOCOL"); |
| 289 | int i; |
| 290 | if (p) { |
| 291 | for (i = 0; backends[i].backend != NULL; i++) { |
| 292 | if (!strcmp(backends[i].name, p)) { |
| 293 | default_protocol = cfg.protocol = backends[i].protocol; |
| 294 | default_port = cfg.port = |
| 295 | backends[i].backend->default_port; |
| 296 | break; |
| 297 | } |
| 298 | } |
| 299 | } |
| 300 | } |
| 301 | while (--argc) { |
| 302 | char *p = *++argv; |
| 303 | if (*p == '-') { |
| 304 | int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL), 1); |
| 305 | if (ret == -2) { |
| 306 | fprintf(stderr, |
| 307 | "plink: option \"%s\" requires an argument\n", p); |
| 308 | errors = 1; |
| 309 | } else if (ret == 2) { |
| 310 | --argc, ++argv; |
| 311 | } else if (ret == 1) { |
| 312 | continue; |
| 313 | } else if (!strcmp(p, "-batch")) { |
| 314 | console_batch_mode = 1; |
| 315 | } else if (!strcmp(p, "-o")) { |
| 316 | if (argc <= 1) { |
| 317 | fprintf(stderr, |
| 318 | "plink: option \"-o\" requires an argument\n"); |
| 319 | errors = 1; |
| 320 | } else { |
| 321 | --argc; |
| 322 | provide_xrm_string(*++argv); |
| 323 | } |
| 324 | } else { |
| 325 | fprintf(stderr, "plink: unknown option \"%s\"\n", p); |
| 326 | errors = 1; |
| 327 | } |
| 328 | } else if (*p) { |
| 329 | if (!*cfg.host) { |
| 330 | char *q = p; |
| 331 | |
| 332 | do_defaults(NULL, &cfg); |
| 333 | |
| 334 | /* |
| 335 | * If the hostname starts with "telnet:", set the |
| 336 | * protocol to Telnet and process the string as a |
| 337 | * Telnet URL. |
| 338 | */ |
| 339 | if (!strncmp(q, "telnet:", 7)) { |
| 340 | char c; |
| 341 | |
| 342 | q += 7; |
| 343 | if (q[0] == '/' && q[1] == '/') |
| 344 | q += 2; |
| 345 | cfg.protocol = PROT_TELNET; |
| 346 | p = q; |
| 347 | while (*p && *p != ':' && *p != '/') |
| 348 | p++; |
| 349 | c = *p; |
| 350 | if (*p) |
| 351 | *p++ = '\0'; |
| 352 | if (c == ':') |
| 353 | cfg.port = atoi(p); |
| 354 | else |
| 355 | cfg.port = -1; |
| 356 | strncpy(cfg.host, q, sizeof(cfg.host) - 1); |
| 357 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
| 358 | } else { |
| 359 | char *r; |
| 360 | /* |
| 361 | * Before we process the [user@]host string, we |
| 362 | * first check for the presence of a protocol |
| 363 | * prefix (a protocol name followed by ","). |
| 364 | */ |
| 365 | r = strchr(p, ','); |
| 366 | if (r) { |
| 367 | int i, j; |
| 368 | for (i = 0; backends[i].backend != NULL; i++) { |
| 369 | j = strlen(backends[i].name); |
| 370 | if (j == r - p && |
| 371 | !memcmp(backends[i].name, p, j)) { |
| 372 | default_protocol = cfg.protocol = |
| 373 | backends[i].protocol; |
| 374 | portnumber = |
| 375 | backends[i].backend->default_port; |
| 376 | p = r + 1; |
| 377 | break; |
| 378 | } |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | /* |
| 383 | * Three cases. Either (a) there's a nonzero |
| 384 | * length string followed by an @, in which |
| 385 | * case that's user and the remainder is host. |
| 386 | * Or (b) there's only one string, not counting |
| 387 | * a potential initial @, and it exists in the |
| 388 | * saved-sessions database. Or (c) only one |
| 389 | * string and it _doesn't_ exist in the |
| 390 | * database. |
| 391 | */ |
| 392 | r = strrchr(p, '@'); |
| 393 | if (r == p) |
| 394 | p++, r = NULL; /* discount initial @ */ |
| 395 | if (r == NULL) { |
| 396 | /* |
| 397 | * One string. |
| 398 | */ |
| 399 | Config cfg2; |
| 400 | do_defaults(p, &cfg2); |
| 401 | if (cfg2.host[0] == '\0') { |
| 402 | /* No settings for this host; use defaults */ |
| 403 | strncpy(cfg.host, p, sizeof(cfg.host) - 1); |
| 404 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
| 405 | cfg.port = default_port; |
| 406 | } else { |
| 407 | cfg = cfg2; |
| 408 | cfg.remote_cmd_ptr = cfg.remote_cmd; |
| 409 | } |
| 410 | } else { |
| 411 | *r++ = '\0'; |
| 412 | strncpy(cfg.username, p, sizeof(cfg.username) - 1); |
| 413 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
| 414 | strncpy(cfg.host, r, sizeof(cfg.host) - 1); |
| 415 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
| 416 | cfg.port = default_port; |
| 417 | } |
| 418 | } |
| 419 | } else { |
| 420 | char *command; |
| 421 | int cmdlen, cmdsize; |
| 422 | cmdlen = cmdsize = 0; |
| 423 | command = NULL; |
| 424 | |
| 425 | while (argc) { |
| 426 | while (*p) { |
| 427 | if (cmdlen >= cmdsize) { |
| 428 | cmdsize = cmdlen + 512; |
| 429 | command = srealloc(command, cmdsize); |
| 430 | } |
| 431 | command[cmdlen++]=*p++; |
| 432 | } |
| 433 | if (cmdlen >= cmdsize) { |
| 434 | cmdsize = cmdlen + 512; |
| 435 | command = srealloc(command, cmdsize); |
| 436 | } |
| 437 | command[cmdlen++]=' '; /* always add trailing space */ |
| 438 | if (--argc) p = *++argv; |
| 439 | } |
| 440 | if (cmdlen) command[--cmdlen]='\0'; |
| 441 | /* change trailing blank to NUL */ |
| 442 | cfg.remote_cmd_ptr = command; |
| 443 | cfg.remote_cmd_ptr2 = NULL; |
| 444 | cfg.nopty = TRUE; /* command => no terminal */ |
| 445 | |
| 446 | break; /* done with cmdline */ |
| 447 | } |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | if (errors) |
| 452 | return 1; |
| 453 | |
| 454 | if (!*cfg.host) { |
| 455 | usage(); |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * Trim leading whitespace off the hostname if it's there. |
| 460 | */ |
| 461 | { |
| 462 | int space = strspn(cfg.host, " \t"); |
| 463 | memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space); |
| 464 | } |
| 465 | |
| 466 | /* See if host is of the form user@host */ |
| 467 | if (cfg.host[0] != '\0') { |
| 468 | char *atsign = strchr(cfg.host, '@'); |
| 469 | /* Make sure we're not overflowing the user field */ |
| 470 | if (atsign) { |
| 471 | if (atsign - cfg.host < sizeof cfg.username) { |
| 472 | strncpy(cfg.username, cfg.host, atsign - cfg.host); |
| 473 | cfg.username[atsign - cfg.host] = '\0'; |
| 474 | } |
| 475 | memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1)); |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | /* |
| 480 | * Perform command-line overrides on session configuration. |
| 481 | */ |
| 482 | cmdline_run_saved(); |
| 483 | |
| 484 | /* |
| 485 | * Trim a colon suffix off the hostname if it's there. |
| 486 | */ |
| 487 | cfg.host[strcspn(cfg.host, ":")] = '\0'; |
| 488 | |
| 489 | /* |
| 490 | * Remove any remaining whitespace from the hostname. |
| 491 | */ |
| 492 | { |
| 493 | int p1 = 0, p2 = 0; |
| 494 | while (cfg.host[p2] != '\0') { |
| 495 | if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') { |
| 496 | cfg.host[p1] = cfg.host[p2]; |
| 497 | p1++; |
| 498 | } |
| 499 | p2++; |
| 500 | } |
| 501 | cfg.host[p1] = '\0'; |
| 502 | } |
| 503 | |
| 504 | if (!*cfg.remote_cmd_ptr) |
| 505 | flags |= FLAG_INTERACTIVE; |
| 506 | |
| 507 | /* |
| 508 | * Select protocol. This is farmed out into a table in a |
| 509 | * separate file to enable an ssh-free variant. |
| 510 | */ |
| 511 | { |
| 512 | int i; |
| 513 | back = NULL; |
| 514 | for (i = 0; backends[i].backend != NULL; i++) |
| 515 | if (backends[i].protocol == cfg.protocol) { |
| 516 | back = backends[i].backend; |
| 517 | break; |
| 518 | } |
| 519 | if (back == NULL) { |
| 520 | fprintf(stderr, |
| 521 | "Internal fault: Unsupported protocol found\n"); |
| 522 | return 1; |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * Select port. |
| 528 | */ |
| 529 | if (portnumber != -1) |
| 530 | cfg.port = portnumber; |
| 531 | |
| 532 | /* |
| 533 | * Set up the pipe we'll use to tell us about SIGWINCH. |
| 534 | */ |
| 535 | if (pipe(signalpipe) < 0) { |
| 536 | perror("pipe"); |
| 537 | exit(1); |
| 538 | } |
| 539 | putty_signal(SIGWINCH, sigwinch); |
| 540 | |
| 541 | sk_init(); |
| 542 | |
| 543 | /* |
| 544 | * Start up the connection. |
| 545 | */ |
| 546 | logctx = log_init(NULL); |
| 547 | { |
| 548 | char *error; |
| 549 | char *realhost; |
| 550 | /* nodelay is only useful if stdin is a terminal device */ |
| 551 | int nodelay = cfg.tcp_nodelay && isatty(0); |
| 552 | |
| 553 | error = back->init(NULL, &backhandle, cfg.host, cfg.port, |
| 554 | &realhost, nodelay); |
| 555 | if (error) { |
| 556 | fprintf(stderr, "Unable to open connection:\n%s\n", error); |
| 557 | return 1; |
| 558 | } |
| 559 | back->provide_logctx(backhandle, logctx); |
| 560 | ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL); |
| 561 | sfree(realhost); |
| 562 | } |
| 563 | connopen = 1; |
| 564 | |
| 565 | /* |
| 566 | * Set up the initial console mode. We don't care if this call |
| 567 | * fails, because we know we aren't necessarily running in a |
| 568 | * console. |
| 569 | */ |
| 570 | tcgetattr(0, &orig_termios); |
| 571 | atexit(cleanup_termios); |
| 572 | ldisc_update(NULL, 1, 1); |
| 573 | sending = FALSE; |
| 574 | |
| 575 | while (1) { |
| 576 | fd_set rset, wset, xset; |
| 577 | int maxfd; |
| 578 | int rwx; |
| 579 | int ret; |
| 580 | |
| 581 | FD_ZERO(&rset); |
| 582 | FD_ZERO(&wset); |
| 583 | FD_ZERO(&xset); |
| 584 | maxfd = 0; |
| 585 | |
| 586 | FD_SET_MAX(signalpipe[0], maxfd, rset); |
| 587 | |
| 588 | if (connopen && !sending && |
| 589 | back->socket(backhandle) != NULL && |
| 590 | back->sendok(backhandle) && |
| 591 | back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) { |
| 592 | /* If we're OK to send, then try to read from stdin. */ |
| 593 | FD_SET_MAX(0, maxfd, rset); |
| 594 | } |
| 595 | |
| 596 | if (bufchain_size(&stdout_data) > 0) { |
| 597 | /* If we have data for stdout, try to write to stdout. */ |
| 598 | FD_SET_MAX(1, maxfd, wset); |
| 599 | } |
| 600 | |
| 601 | if (bufchain_size(&stderr_data) > 0) { |
| 602 | /* If we have data for stderr, try to write to stderr. */ |
| 603 | FD_SET_MAX(2, maxfd, wset); |
| 604 | } |
| 605 | |
| 606 | /* Count the currently active sockets. */ |
| 607 | i = 0; |
| 608 | for (socket = first_socket(&socketstate, &rwx); socket >= 0; |
| 609 | socket = next_socket(&socketstate, &rwx)) i++; |
| 610 | |
| 611 | /* Expand the sklist buffer if necessary. */ |
| 612 | if (i > sksize) { |
| 613 | sksize = i + 16; |
| 614 | sklist = srealloc(sklist, sksize * sizeof(*sklist)); |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * Add all currently open sockets to the select sets, and |
| 619 | * store them in sklist as well. |
| 620 | */ |
| 621 | skcount = 0; |
| 622 | for (socket = first_socket(&socketstate, &rwx); socket >= 0; |
| 623 | socket = next_socket(&socketstate, &rwx)) { |
| 624 | sklist[skcount++] = socket; |
| 625 | if (rwx & 1) |
| 626 | FD_SET_MAX(socket, maxfd, rset); |
| 627 | if (rwx & 2) |
| 628 | FD_SET_MAX(socket, maxfd, wset); |
| 629 | if (rwx & 4) |
| 630 | FD_SET_MAX(socket, maxfd, xset); |
| 631 | } |
| 632 | |
| 633 | do { |
| 634 | ret = select(maxfd, &rset, &wset, &xset, NULL); |
| 635 | } while (ret < 0 && errno == EINTR); |
| 636 | |
| 637 | if (ret < 0) { |
| 638 | perror("select"); |
| 639 | exit(1); |
| 640 | } |
| 641 | |
| 642 | for (i = 0; i < skcount; i++) { |
| 643 | socket = sklist[i]; |
| 644 | /* |
| 645 | * We must process exceptional notifications before |
| 646 | * ordinary readability ones, or we may go straight |
| 647 | * past the urgent marker. |
| 648 | */ |
| 649 | if (FD_ISSET(socket, &xset)) |
| 650 | select_result(socket, 4); |
| 651 | if (FD_ISSET(socket, &rset)) |
| 652 | select_result(socket, 1); |
| 653 | if (FD_ISSET(socket, &wset)) |
| 654 | select_result(socket, 2); |
| 655 | } |
| 656 | |
| 657 | if (FD_ISSET(signalpipe[0], &rset)) { |
| 658 | char c[1]; |
| 659 | struct winsize size; |
| 660 | read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */ |
| 661 | if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0) |
| 662 | back->size(backhandle, size.ws_col, size.ws_row); |
| 663 | } |
| 664 | |
| 665 | if (FD_ISSET(0, &rset)) { |
| 666 | char buf[4096]; |
| 667 | int ret; |
| 668 | |
| 669 | if (connopen && back->socket(backhandle) != NULL) { |
| 670 | ret = read(0, buf, sizeof(buf)); |
| 671 | if (ret < 0) { |
| 672 | perror("stdin: read"); |
| 673 | exit(1); |
| 674 | } else if (ret == 0) { |
| 675 | back->special(backhandle, TS_EOF); |
| 676 | sending = FALSE; /* send nothing further after this */ |
| 677 | } else { |
| 678 | back->send(backhandle, buf, ret); |
| 679 | } |
| 680 | } |
| 681 | } |
| 682 | |
| 683 | if (FD_ISSET(1, &wset)) { |
| 684 | try_output(0); |
| 685 | } |
| 686 | |
| 687 | if (FD_ISSET(2, &wset)) { |
| 688 | try_output(1); |
| 689 | } |
| 690 | |
| 691 | if ((!connopen || back->socket(backhandle) == NULL) && |
| 692 | bufchain_size(&stdout_data) == 0 && |
| 693 | bufchain_size(&stderr_data) == 0) |
| 694 | break; /* we closed the connection */ |
| 695 | } |
| 696 | exitcode = back->exitcode(backhandle); |
| 697 | if (exitcode < 0) { |
| 698 | fprintf(stderr, "Remote process exit code unavailable\n"); |
| 699 | exitcode = 1; /* this is an error condition */ |
| 700 | } |
| 701 | cleanup_exit(exitcode); |
| 702 | return exitcode; /* shouldn't happen, but placates gcc */ |
| 703 | } |