1 /* 2 * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. 3 * 4 * Modification and redistribution in source and binary forms is 5 * permitted provided that due credit is given to the author and the 6 * OpenBSD project by leaving this copyright notice intact. 7 */ 8 9 /* 10 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 11 * Use is subject to license terms. 12 */ 13 14 #include "includes.h" 15 RCSID("$OpenBSD: ssh-keyscan.c,v 1.40 2002/07/06 17:47:58 stevesk Exp $"); 16 17 #include "sys-queue.h" 18 19 #include <openssl/bn.h> 20 21 #include <setjmp.h> 22 #include "xmalloc.h" 23 #include "ssh.h" 24 #include "ssh1.h" 25 #include "key.h" 26 #include "kex.h" 27 #include "compat.h" 28 #include "myproposal.h" 29 #include "packet.h" 30 #include "dispatch.h" 31 #include "buffer.h" 32 #include "bufaux.h" 33 #include "log.h" 34 #include "atomicio.h" 35 #include "misc.h" 36 37 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. 38 Default value is AF_UNSPEC means both IPv4 and IPv6. */ 39 #ifdef IPV4_DEFAULT 40 int IPv4or6 = AF_INET; 41 #else 42 int IPv4or6 = AF_UNSPEC; 43 #endif 44 45 int ssh_port = SSH_DEFAULT_PORT; 46 47 #define KT_RSA1 1 48 #define KT_DSA 2 49 #define KT_RSA 4 50 51 int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */ 52 53 #define MAXMAXFD 256 54 55 /* The number of seconds after which to give up on a TCP connection */ 56 int timeout = 5; 57 58 int maxfd; 59 #define MAXCON (maxfd - 10) 60 61 #ifdef HAVE___PROGNAME 62 extern char *__progname; 63 #else 64 char *__progname; 65 #endif 66 fd_set *read_wait; 67 size_t read_wait_size; 68 int ncon; 69 int nonfatal_fatal = 0; 70 jmp_buf kexjmp; 71 Key *kexjmp_key; 72 73 /* 74 * Keep a connection structure for each file descriptor. The state 75 * associated with file descriptor n is held in fdcon[n]. 76 */ 77 typedef struct Connection { 78 u_char c_status; /* State of connection on this file desc. */ 79 #define CS_UNUSED 0 /* File descriptor unused */ 80 #define CS_CON 1 /* Waiting to connect/read greeting */ 81 #define CS_SIZE 2 /* Waiting to read initial packet size */ 82 #define CS_KEYS 3 /* Waiting to read public key packet */ 83 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 84 int c_plen; /* Packet length field for ssh packet */ 85 int c_len; /* Total bytes which must be read. */ 86 int c_off; /* Length of data read so far. */ 87 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ 88 char *c_namebase; /* Address to free for c_name and c_namelist */ 89 char *c_name; /* Hostname of connection for errors */ 90 char *c_namelist; /* Pointer to other possible addresses */ 91 char *c_output_name; /* Hostname of connection for output */ 92 char *c_data; /* Data read from this fd */ 93 Kex *c_kex; /* The key-exchange struct for ssh2 */ 94 struct timeval c_tv; /* Time at which connection gets aborted */ 95 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 96 } con; 97 98 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 99 con *fdcon; 100 101 /* 102 * This is just a wrapper around fgets() to make it usable. 103 */ 104 105 /* Stress-test. Increase this later. */ 106 #define LINEBUF_SIZE 16 107 108 typedef struct { 109 char *buf; 110 u_int size; 111 int lineno; 112 const char *filename; 113 FILE *stream; 114 void (*errfun) (const char *,...); 115 } Linebuf; 116 117 static Linebuf * 118 Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) 119 { 120 Linebuf *lb; 121 122 if (!(lb = malloc(sizeof(*lb)))) { 123 if (errfun) 124 (*errfun) ("linebuf (%s): malloc failed\n", 125 filename ? filename : "(stdin)"); 126 return (NULL); 127 } 128 if (filename) { 129 lb->filename = filename; 130 if (!(lb->stream = fopen(filename, "r"))) { 131 xfree(lb); 132 if (errfun) 133 (*errfun) ("%s: %s\n", filename, strerror(errno)); 134 return (NULL); 135 } 136 } else { 137 lb->filename = "(stdin)"; 138 lb->stream = stdin; 139 } 140 141 if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) { 142 if (errfun) 143 (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); 144 xfree(lb); 145 return (NULL); 146 } 147 lb->errfun = errfun; 148 lb->lineno = 0; 149 return (lb); 150 } 151 152 static void 153 Linebuf_free(Linebuf * lb) 154 { 155 fclose(lb->stream); 156 xfree(lb->buf); 157 xfree(lb); 158 } 159 160 #if 0 161 static void 162 Linebuf_restart(Linebuf * lb) 163 { 164 clearerr(lb->stream); 165 rewind(lb->stream); 166 lb->lineno = 0; 167 } 168 169 static int 170 Linebuf_lineno(Linebuf * lb) 171 { 172 return (lb->lineno); 173 } 174 #endif 175 176 static char * 177 Linebuf_getline(Linebuf * lb) 178 { 179 int n = 0; 180 void *p; 181 182 lb->lineno++; 183 for (;;) { 184 /* Read a line */ 185 if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { 186 if (ferror(lb->stream) && lb->errfun) 187 (*lb->errfun)("%s: %s\n", lb->filename, 188 strerror(errno)); 189 return (NULL); 190 } 191 n = strlen(lb->buf); 192 193 /* Return it or an error if it fits */ 194 if (n > 0 && lb->buf[n - 1] == '\n') { 195 lb->buf[n - 1] = '\0'; 196 return (lb->buf); 197 } 198 if (n != lb->size - 1) { 199 if (lb->errfun) 200 (*lb->errfun)("%s: skipping incomplete last line\n", 201 lb->filename); 202 return (NULL); 203 } 204 /* Double the buffer if we need more space */ 205 lb->size *= 2; 206 if ((p = realloc(lb->buf, lb->size)) == NULL) { 207 lb->size /= 2; 208 if (lb->errfun) 209 (*lb->errfun)("linebuf (%s): realloc failed\n", 210 lb->filename); 211 return (NULL); 212 } 213 lb->buf = p; 214 } 215 } 216 217 static int 218 fdlim_get(int hard) 219 { 220 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) 221 struct rlimit rlfd; 222 223 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 224 return (-1); 225 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 226 return 10000; 227 else 228 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 229 #elif defined (HAVE_SYSCONF) 230 return sysconf (_SC_OPEN_MAX); 231 #else 232 return 10000; 233 #endif 234 } 235 236 static int 237 fdlim_set(int lim) 238 { 239 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) 240 struct rlimit rlfd; 241 #endif 242 243 if (lim <= 0) 244 return (-1); 245 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) 246 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 247 return (-1); 248 rlfd.rlim_cur = lim; 249 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) 250 return (-1); 251 #elif defined (HAVE_SETDTABLESIZE) 252 setdtablesize(lim); 253 #endif 254 return (0); 255 } 256 257 /* 258 * This is an strsep function that returns a null field for adjacent 259 * separators. This is the same as the 4.4BSD strsep, but different from the 260 * one in the GNU libc. 261 */ 262 static char * 263 xstrsep(char **str, const char *delim) 264 { 265 char *s, *e; 266 267 if (!**str) 268 return (NULL); 269 270 s = *str; 271 e = s + strcspn(s, delim); 272 273 if (*e != '\0') 274 *e++ = '\0'; 275 *str = e; 276 277 return (s); 278 } 279 280 /* 281 * Get the next non-null token (like GNU strsep). Strsep() will return a 282 * null token for two adjacent separators, so we may have to loop. 283 */ 284 static char * 285 strnnsep(char **stringp, char *delim) 286 { 287 char *tok; 288 289 do { 290 tok = xstrsep(stringp, delim); 291 } while (tok && *tok == '\0'); 292 return (tok); 293 } 294 295 static Key * 296 keygrab_ssh1(con *c) 297 { 298 static Key *rsa; 299 static Buffer msg; 300 301 if (rsa == NULL) { 302 buffer_init(&msg); 303 rsa = key_new(KEY_RSA1); 304 } 305 buffer_append(&msg, c->c_data, c->c_plen); 306 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ 307 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { 308 error("%s: invalid packet type", c->c_name); 309 buffer_clear(&msg); 310 return NULL; 311 } 312 buffer_consume(&msg, 8); /* cookie */ 313 314 /* server key */ 315 (void) buffer_get_int(&msg); 316 buffer_get_bignum(&msg, rsa->rsa->e); 317 buffer_get_bignum(&msg, rsa->rsa->n); 318 319 /* host key */ 320 (void) buffer_get_int(&msg); 321 buffer_get_bignum(&msg, rsa->rsa->e); 322 buffer_get_bignum(&msg, rsa->rsa->n); 323 324 buffer_clear(&msg); 325 326 return (rsa); 327 } 328 329 static int 330 hostjump(Key *hostkey) 331 { 332 kexjmp_key = hostkey; 333 longjmp(kexjmp, 1); 334 /* NOTREACHED */ 335 return (0); 336 } 337 338 static int 339 ssh2_capable(int remote_major, int remote_minor) 340 { 341 switch (remote_major) { 342 case 1: 343 if (remote_minor == 99) 344 return 1; 345 break; 346 case 2: 347 return 1; 348 default: 349 break; 350 } 351 return 0; 352 } 353 354 static Key * 355 keygrab_ssh2(con *c) 356 { 357 int j; 358 359 packet_set_connection(c->c_fd, c->c_fd); 360 enable_compat20(); 361 my_clnt_proposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = 362 c->c_keytype == KT_DSA? "ssh-dss": "ssh-rsa"; 363 c->c_kex = kex_setup(c->c_name, my_clnt_proposal, NULL); 364 kex_start(c->c_kex); 365 c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; 366 c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 367 c->c_kex->verify_host_key = hostjump; 368 369 if (!(j = setjmp(kexjmp))) { 370 nonfatal_fatal = 1; 371 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); 372 fprintf(stderr, "Impossible! dispatch_run() returned!\n"); 373 exit(1); 374 } 375 nonfatal_fatal = 0; 376 xfree(c->c_kex); 377 c->c_kex = NULL; 378 packet_close(); 379 380 return j < 0? NULL : kexjmp_key; 381 } 382 383 static void 384 keyprint(con *c, Key *key) 385 { 386 if (!key) 387 return; 388 389 fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name); 390 key_write(key, stdout); 391 fputs("\n", stdout); 392 } 393 394 static int 395 tcpconnect(char *host) 396 { 397 struct addrinfo hints, *ai, *aitop; 398 char strport[NI_MAXSERV]; 399 int gaierr, s = -1; 400 401 snprintf(strport, sizeof strport, "%d", ssh_port); 402 memset(&hints, 0, sizeof(hints)); 403 hints.ai_family = IPv4or6; 404 hints.ai_socktype = SOCK_STREAM; 405 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) 406 fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr)); 407 for (ai = aitop; ai; ai = ai->ai_next) { 408 s = socket(ai->ai_family, SOCK_STREAM, 0); 409 if (s < 0) { 410 error("socket: %s", strerror(errno)); 411 continue; 412 } 413 if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) 414 fatal("F_SETFL: %s", strerror(errno)); 415 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 416 errno != EINPROGRESS) 417 error("connect (`%s'): %s", host, strerror(errno)); 418 else 419 break; 420 close(s); 421 s = -1; 422 } 423 freeaddrinfo(aitop); 424 return s; 425 } 426 427 static int 428 conalloc(char *iname, char *oname, int keytype) 429 { 430 char *namebase, *name, *namelist; 431 int s; 432 433 namebase = namelist = xstrdup(iname); 434 435 do { 436 name = xstrsep(&namelist, ","); 437 if (!name) { 438 xfree(namebase); 439 return (-1); 440 } 441 } while ((s = tcpconnect(name)) < 0); 442 443 if (s >= maxfd) 444 fatal("conalloc: fdno %d too high", s); 445 if (fdcon[s].c_status) 446 fatal("conalloc: attempt to reuse fdno %d", s); 447 448 fdcon[s].c_fd = s; 449 fdcon[s].c_status = CS_CON; 450 fdcon[s].c_namebase = namebase; 451 fdcon[s].c_name = name; 452 fdcon[s].c_namelist = namelist; 453 fdcon[s].c_output_name = xstrdup(oname); 454 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 455 fdcon[s].c_len = 4; 456 fdcon[s].c_off = 0; 457 fdcon[s].c_keytype = keytype; 458 gettimeofday(&fdcon[s].c_tv, NULL); 459 fdcon[s].c_tv.tv_sec += timeout; 460 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 461 FD_SET(s, read_wait); 462 ncon++; 463 return (s); 464 } 465 466 static void 467 confree(int s) 468 { 469 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 470 fatal("confree: attempt to free bad fdno %d", s); 471 close(s); 472 xfree(fdcon[s].c_namebase); 473 xfree(fdcon[s].c_output_name); 474 if (fdcon[s].c_status == CS_KEYS) 475 xfree(fdcon[s].c_data); 476 fdcon[s].c_status = CS_UNUSED; 477 fdcon[s].c_keytype = 0; 478 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 479 FD_CLR(s, read_wait); 480 ncon--; 481 } 482 483 static void 484 contouch(int s) 485 { 486 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 487 gettimeofday(&fdcon[s].c_tv, NULL); 488 fdcon[s].c_tv.tv_sec += timeout; 489 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 490 } 491 492 static int 493 conrecycle(int s) 494 { 495 con *c = &fdcon[s]; 496 int ret; 497 498 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 499 confree(s); 500 return (ret); 501 } 502 503 static void 504 congreet(int s) 505 { 506 int remote_major, remote_minor, n = 0; 507 char buf[256], *cp; 508 char remote_version[sizeof buf]; 509 size_t bufsiz; 510 con *c = &fdcon[s]; 511 512 bufsiz = sizeof(buf); 513 cp = buf; 514 while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') { 515 if (*cp == '\r') 516 *cp = '\n'; 517 cp++; 518 } 519 if (n < 0) { 520 if (errno != ECONNREFUSED) 521 error("read (%s): %s", c->c_name, strerror(errno)); 522 conrecycle(s); 523 return; 524 } 525 if (n == 0) { 526 error("%s: Connection closed by remote host", c->c_name); 527 conrecycle(s); 528 return; 529 } 530 if (*cp != '\n' && *cp != '\r') { 531 error("%s: bad greeting", c->c_name); 532 confree(s); 533 return; 534 } 535 *cp = '\0'; 536 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 537 &remote_major, &remote_minor, remote_version) == 3) 538 compat_datafellows(remote_version); 539 else 540 datafellows = 0; 541 if (c->c_keytype != KT_RSA1) { 542 if (!ssh2_capable(remote_major, remote_minor)) { 543 debug("%s doesn't support ssh2", c->c_name); 544 confree(s); 545 return; 546 } 547 } else if (remote_major != 1) { 548 debug("%s doesn't support ssh1", c->c_name); 549 confree(s); 550 return; 551 } 552 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); 553 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 554 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, 555 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); 556 if (atomicio(write, s, buf, n) != n) { 557 error("write (%s): %s", c->c_name, strerror(errno)); 558 confree(s); 559 return; 560 } 561 if (c->c_keytype != KT_RSA1) { 562 keyprint(c, keygrab_ssh2(c)); 563 confree(s); 564 return; 565 } 566 c->c_status = CS_SIZE; 567 contouch(s); 568 } 569 570 static void 571 conread(int s) 572 { 573 con *c = &fdcon[s]; 574 int n; 575 576 if (c->c_status == CS_CON) { 577 congreet(s); 578 return; 579 } 580 n = read(s, c->c_data + c->c_off, c->c_len - c->c_off); 581 if (n < 0) { 582 error("read (%s): %s", c->c_name, strerror(errno)); 583 confree(s); 584 return; 585 } 586 c->c_off += n; 587 588 if (c->c_off == c->c_len) 589 switch (c->c_status) { 590 case CS_SIZE: 591 c->c_plen = htonl(c->c_plen); 592 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 593 c->c_off = 0; 594 c->c_data = xmalloc(c->c_len); 595 c->c_status = CS_KEYS; 596 break; 597 case CS_KEYS: 598 keyprint(c, keygrab_ssh1(c)); 599 confree(s); 600 return; 601 break; 602 default: 603 fatal("conread: invalid status %d", c->c_status); 604 break; 605 } 606 607 contouch(s); 608 } 609 610 static void 611 conloop(void) 612 { 613 struct timeval seltime, now; 614 fd_set *r, *e; 615 con *c; 616 int i; 617 618 gettimeofday(&now, NULL); 619 c = TAILQ_FIRST(&tq); 620 621 if (c && (c->c_tv.tv_sec > now.tv_sec || 622 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 623 seltime = c->c_tv; 624 seltime.tv_sec -= now.tv_sec; 625 seltime.tv_usec -= now.tv_usec; 626 if (seltime.tv_usec < 0) { 627 seltime.tv_usec += 1000000; 628 seltime.tv_sec--; 629 } 630 } else 631 seltime.tv_sec = seltime.tv_usec = 0; 632 633 r = xmalloc(read_wait_size); 634 memcpy(r, read_wait, read_wait_size); 635 e = xmalloc(read_wait_size); 636 memcpy(e, read_wait, read_wait_size); 637 638 while (select(maxfd, r, NULL, e, &seltime) == -1 && 639 (errno == EAGAIN || errno == EINTR)) 640 ; 641 642 for (i = 0; i < maxfd; i++) { 643 if (FD_ISSET(i, e)) { 644 error("%s: exception!", fdcon[i].c_name); 645 confree(i); 646 } else if (FD_ISSET(i, r)) 647 conread(i); 648 } 649 xfree(r); 650 xfree(e); 651 652 c = TAILQ_FIRST(&tq); 653 while (c && (c->c_tv.tv_sec < now.tv_sec || 654 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 655 int s = c->c_fd; 656 657 c = TAILQ_NEXT(c, c_link); 658 conrecycle(s); 659 } 660 } 661 662 static void 663 do_host(char *host) 664 { 665 char *name = strnnsep(&host, " \t\n"); 666 int j; 667 668 if (name == NULL) 669 return; 670 for (j = KT_RSA1; j <= KT_RSA; j *= 2) { 671 if (get_keytypes & j) { 672 while (ncon >= MAXCON) 673 conloop(); 674 conalloc(name, *host ? host : name, j); 675 } 676 } 677 } 678 679 void 680 fatal(const char *fmt,...) 681 { 682 va_list args; 683 684 va_start(args, fmt); 685 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 686 va_end(args); 687 if (nonfatal_fatal) 688 longjmp(kexjmp, -1); 689 else 690 fatal_cleanup(); 691 } 692 693 static void 694 usage(void) 695 { 696 fprintf(stderr, 697 gettext("Usage: %s [-v46] [-p port] [-T timeout] [-f file]\n" 698 "\t\t [host | addrlist namelist] [...]\n"), 699 __progname); 700 exit(1); 701 } 702 703 int 704 main(int argc, char **argv) 705 { 706 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 707 int opt, fopt_count = 0; 708 char *tname; 709 710 extern int optind; 711 extern char *optarg; 712 713 __progname = get_progname(argv[0]); 714 715 (void) g11n_setlocale(LC_ALL, ""); 716 717 init_rng(); 718 seed_rng(); 719 TAILQ_INIT(&tq); 720 721 if (argc <= 1) 722 usage(); 723 724 while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) { 725 switch (opt) { 726 case 'p': 727 ssh_port = a2port(optarg); 728 if (ssh_port == 0) { 729 fprintf(stderr, gettext("Bad port '%s'\n"), 730 optarg); 731 exit(1); 732 } 733 break; 734 case 'T': 735 timeout = convtime(optarg); 736 if (timeout == -1 || timeout == 0) { 737 fprintf(stderr, gettext("Bad timeout '%s'\n"), 738 optarg); 739 usage(); 740 } 741 break; 742 case 'v': 743 if (!debug_flag) { 744 debug_flag = 1; 745 log_level = SYSLOG_LEVEL_DEBUG1; 746 } 747 else if (log_level < SYSLOG_LEVEL_DEBUG3) 748 log_level++; 749 else 750 fatal("Too high debugging level."); 751 break; 752 case 'f': 753 if (strcmp(optarg, "-") == 0) 754 optarg = NULL; 755 argv[fopt_count++] = optarg; 756 break; 757 case 't': 758 get_keytypes = 0; 759 tname = strtok(optarg, ","); 760 while (tname) { 761 int type = key_type_from_name(tname); 762 switch (type) { 763 case KEY_RSA1: 764 get_keytypes |= KT_RSA1; 765 break; 766 case KEY_DSA: 767 get_keytypes |= KT_DSA; 768 break; 769 case KEY_RSA: 770 get_keytypes |= KT_RSA; 771 break; 772 case KEY_UNSPEC: 773 fatal("unknown key type %s", tname); 774 } 775 tname = strtok(NULL, ","); 776 } 777 break; 778 case '4': 779 IPv4or6 = AF_INET; 780 break; 781 case '6': 782 IPv4or6 = AF_INET6; 783 break; 784 case '?': 785 default: 786 usage(); 787 } 788 } 789 if (optind == argc && !fopt_count) 790 usage(); 791 792 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 793 794 maxfd = fdlim_get(1); 795 if (maxfd < 0) 796 fatal("%s: fdlim_get: bad value", __progname); 797 if (maxfd > MAXMAXFD) 798 maxfd = MAXMAXFD; 799 if (MAXCON <= 0) 800 fatal("%s: not enough file descriptors", __progname); 801 if (maxfd > fdlim_get(0)) 802 fdlim_set(maxfd); 803 fdcon = xmalloc(maxfd * sizeof(con)); 804 memset(fdcon, 0, maxfd * sizeof(con)); 805 806 read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask); 807 read_wait = xmalloc(read_wait_size); 808 memset(read_wait, 0, read_wait_size); 809 810 if (fopt_count) { 811 Linebuf *lb; 812 char *line; 813 int j; 814 815 for (j = 0; j < fopt_count; j++) { 816 lb = Linebuf_alloc(argv[j], error); 817 if (!lb) 818 continue; 819 while ((line = Linebuf_getline(lb)) != NULL) 820 do_host(line); 821 Linebuf_free(lb); 822 } 823 } 824 825 while (optind < argc) 826 do_host(argv[optind++]); 827 828 while (ncon > 0) 829 conloop(); 830 831 return (0); 832 } 833