1 /* $NetBSD: ssh-keyscan.c,v 1.3 2010/07/08 21:16:44 rmind Exp $ */ 2 /* $OpenBSD: ssh-keyscan.c,v 1.78 2009/01/22 10:02:34 djm Exp $ */ 3 /* 4 * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. 5 * 6 * Modification and redistribution in source and binary forms is 7 * permitted provided that due credit is given to the author and the 8 * OpenBSD project by leaving this copyright notice intact. 9 */ 10 11 #include "includes.h" 12 __RCSID("$NetBSD: ssh-keyscan.c,v 1.3 2010/07/08 21:16:44 rmind Exp $"); 13 14 #include <sys/param.h> 15 #include <sys/types.h> 16 #include <sys/socket.h> 17 #include <sys/queue.h> 18 #include <sys/time.h> 19 #include <sys/resource.h> 20 21 #include <openssl/bn.h> 22 23 #include <errno.h> 24 #include <netdb.h> 25 #include <setjmp.h> 26 #include <stdarg.h> 27 #include <stdio.h> 28 #include <stdlib.h> 29 #include <signal.h> 30 #include <string.h> 31 #include <unistd.h> 32 33 #include "xmalloc.h" 34 #include "ssh.h" 35 #include "ssh1.h" 36 #include "buffer.h" 37 #include "key.h" 38 #include "cipher.h" 39 #include "kex.h" 40 #include "compat.h" 41 #include "myproposal.h" 42 #include "packet.h" 43 #include "dispatch.h" 44 #include "log.h" 45 #include "atomicio.h" 46 #include "misc.h" 47 #include "hostfile.h" 48 49 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. 50 Default value is AF_UNSPEC means both IPv4 and IPv6. */ 51 int IPv4or6 = AF_UNSPEC; 52 53 int ssh_port = SSH_DEFAULT_PORT; 54 55 #define KT_RSA1 1 56 #define KT_DSA 2 57 #define KT_RSA 4 58 59 int get_keytypes = KT_RSA; /* Get only RSA keys by default */ 60 61 int hash_hosts = 0; /* Hash hostname on output */ 62 63 #define MAXMAXFD 256 64 65 /* The number of seconds after which to give up on a TCP connection */ 66 int timeout = 5; 67 68 int maxfd; 69 #define MAXCON (maxfd - 10) 70 71 extern char *__progname; 72 fd_set *read_wait; 73 size_t read_wait_nfdset; 74 int ncon; 75 int nonfatal_fatal = 0; 76 jmp_buf kexjmp; 77 Key *kexjmp_key; 78 79 /* 80 * Keep a connection structure for each file descriptor. The state 81 * associated with file descriptor n is held in fdcon[n]. 82 */ 83 typedef struct Connection { 84 u_char c_status; /* State of connection on this file desc. */ 85 #define CS_UNUSED 0 /* File descriptor unused */ 86 #define CS_CON 1 /* Waiting to connect/read greeting */ 87 #define CS_SIZE 2 /* Waiting to read initial packet size */ 88 #define CS_KEYS 3 /* Waiting to read public key packet */ 89 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 90 int c_plen; /* Packet length field for ssh packet */ 91 int c_len; /* Total bytes which must be read. */ 92 int c_off; /* Length of data read so far. */ 93 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ 94 char *c_namebase; /* Address to free for c_name and c_namelist */ 95 char *c_name; /* Hostname of connection for errors */ 96 char *c_namelist; /* Pointer to other possible addresses */ 97 char *c_output_name; /* Hostname of connection for output */ 98 char *c_data; /* Data read from this fd */ 99 Kex *c_kex; /* The key-exchange struct for ssh2 */ 100 struct timeval c_tv; /* Time at which connection gets aborted */ 101 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 102 } con; 103 104 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 105 con *fdcon; 106 107 /* 108 * This is just a wrapper around fgets() to make it usable. 109 */ 110 111 /* Stress-test. Increase this later. */ 112 #define LINEBUF_SIZE 16 113 114 typedef struct { 115 char *buf; 116 u_int size; 117 int lineno; 118 const char *filename; 119 FILE *stream; 120 void (*errfun) (const char *,...); 121 } Linebuf; 122 123 static Linebuf * 124 Linebuf_alloc(const char *filename, void (*errfun) (const char *,...)) 125 { 126 Linebuf *lb; 127 128 if (!(lb = malloc(sizeof(*lb)))) { 129 if (errfun) 130 (*errfun) ("linebuf (%s): malloc failed\n", 131 filename ? filename : "(stdin)"); 132 return (NULL); 133 } 134 if (filename) { 135 lb->filename = filename; 136 if (!(lb->stream = fopen(filename, "r"))) { 137 xfree(lb); 138 if (errfun) 139 (*errfun) ("%s: %s\n", filename, strerror(errno)); 140 return (NULL); 141 } 142 } else { 143 lb->filename = "(stdin)"; 144 lb->stream = stdin; 145 } 146 147 if (!(lb->buf = malloc((lb->size = LINEBUF_SIZE)))) { 148 if (errfun) 149 (*errfun) ("linebuf (%s): malloc failed\n", lb->filename); 150 xfree(lb); 151 return (NULL); 152 } 153 lb->errfun = errfun; 154 lb->lineno = 0; 155 return (lb); 156 } 157 158 static void 159 Linebuf_free(Linebuf * lb) 160 { 161 fclose(lb->stream); 162 xfree(lb->buf); 163 xfree(lb); 164 } 165 166 #if 0 167 static void 168 Linebuf_restart(Linebuf * lb) 169 { 170 clearerr(lb->stream); 171 rewind(lb->stream); 172 lb->lineno = 0; 173 } 174 175 static int 176 Linebuf_lineno(Linebuf * lb) 177 { 178 return (lb->lineno); 179 } 180 #endif 181 182 static char * 183 Linebuf_getline(Linebuf * lb) 184 { 185 size_t n = 0; 186 void *p; 187 188 lb->lineno++; 189 for (;;) { 190 /* Read a line */ 191 if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) { 192 if (ferror(lb->stream) && lb->errfun) 193 (*lb->errfun)("%s: %s\n", lb->filename, 194 strerror(errno)); 195 return (NULL); 196 } 197 n = strlen(lb->buf); 198 199 /* Return it or an error if it fits */ 200 if (n > 0 && lb->buf[n - 1] == '\n') { 201 lb->buf[n - 1] = '\0'; 202 return (lb->buf); 203 } 204 if (n != lb->size - 1) { 205 if (lb->errfun) 206 (*lb->errfun)("%s: skipping incomplete last line\n", 207 lb->filename); 208 return (NULL); 209 } 210 /* Double the buffer if we need more space */ 211 lb->size *= 2; 212 if ((p = realloc(lb->buf, lb->size)) == NULL) { 213 lb->size /= 2; 214 if (lb->errfun) 215 (*lb->errfun)("linebuf (%s): realloc failed\n", 216 lb->filename); 217 return (NULL); 218 } 219 lb->buf = p; 220 } 221 } 222 223 static int 224 fdlim_get(int hard) 225 { 226 struct rlimit rlfd; 227 228 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 229 return (-1); 230 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 231 return sysconf(_SC_OPEN_MAX); 232 else 233 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 234 } 235 236 static int 237 fdlim_set(int lim) 238 { 239 struct rlimit rlfd; 240 241 if (lim <= 0) 242 return (-1); 243 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 244 return (-1); 245 rlfd.rlim_cur = lim; 246 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) 247 return (-1); 248 return (0); 249 } 250 251 /* 252 * This is an strsep function that returns a null field for adjacent 253 * separators. This is the same as the 4.4BSD strsep, but different from the 254 * one in the GNU libc. 255 */ 256 static char * 257 xstrsep(char **str, const char *delim) 258 { 259 char *s, *e; 260 261 if (!**str) 262 return (NULL); 263 264 s = *str; 265 e = s + strcspn(s, delim); 266 267 if (*e != '\0') 268 *e++ = '\0'; 269 *str = e; 270 271 return (s); 272 } 273 274 /* 275 * Get the next non-null token (like GNU strsep). Strsep() will return a 276 * null token for two adjacent separators, so we may have to loop. 277 */ 278 static char * 279 strnnsep(char **stringp, char *delim) 280 { 281 char *tok; 282 283 do { 284 tok = xstrsep(stringp, delim); 285 } while (tok && *tok == '\0'); 286 return (tok); 287 } 288 289 static Key * 290 keygrab_ssh1(con *c) 291 { 292 static Key *rsa; 293 static Buffer msg; 294 295 if (rsa == NULL) { 296 buffer_init(&msg); 297 rsa = key_new(KEY_RSA1); 298 } 299 buffer_append(&msg, c->c_data, c->c_plen); 300 buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */ 301 if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) { 302 error("%s: invalid packet type", c->c_name); 303 buffer_clear(&msg); 304 return NULL; 305 } 306 buffer_consume(&msg, 8); /* cookie */ 307 308 /* server key */ 309 (void) buffer_get_int(&msg); 310 buffer_get_bignum(&msg, rsa->rsa->e); 311 buffer_get_bignum(&msg, rsa->rsa->n); 312 313 /* host key */ 314 (void) buffer_get_int(&msg); 315 buffer_get_bignum(&msg, rsa->rsa->e); 316 buffer_get_bignum(&msg, rsa->rsa->n); 317 318 buffer_clear(&msg); 319 320 return (rsa); 321 } 322 323 static int 324 hostjump(Key *hostkey) 325 { 326 kexjmp_key = hostkey; 327 longjmp(kexjmp, 1); 328 } 329 330 static int 331 ssh2_capable(int remote_major, int remote_minor) 332 { 333 switch (remote_major) { 334 case 1: 335 if (remote_minor == 99) 336 return 1; 337 break; 338 case 2: 339 return 1; 340 default: 341 break; 342 } 343 return 0; 344 } 345 346 static Key * 347 keygrab_ssh2(con *c) 348 { 349 int j; 350 351 packet_set_connection(c->c_fd, c->c_fd); 352 enable_compat20(); 353 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA? 354 "ssh-dss": "ssh-rsa"; 355 c->c_kex = kex_setup(myproposal); 356 c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; 357 c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; 358 c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 359 c->c_kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 360 c->c_kex->verify_host_key = hostjump; 361 362 if (!(j = setjmp(kexjmp))) { 363 nonfatal_fatal = 1; 364 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex); 365 fprintf(stderr, "Impossible! dispatch_run() returned!\n"); 366 exit(1); 367 } 368 nonfatal_fatal = 0; 369 xfree(c->c_kex); 370 c->c_kex = NULL; 371 packet_close(); 372 373 return j < 0? NULL : kexjmp_key; 374 } 375 376 static void 377 keyprint(con *c, Key *key) 378 { 379 char *host = c->c_output_name ? c->c_output_name : c->c_name; 380 381 if (!key) 382 return; 383 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) 384 fatal("host_hash failed"); 385 386 fprintf(stdout, "%s ", host); 387 key_write(key, stdout); 388 fputs("\n", stdout); 389 } 390 391 static int 392 tcpconnect(char *host) 393 { 394 struct addrinfo hints, *ai, *aitop; 395 char strport[NI_MAXSERV]; 396 int gaierr, s = -1; 397 398 snprintf(strport, sizeof strport, "%d", ssh_port); 399 memset(&hints, 0, sizeof(hints)); 400 hints.ai_family = IPv4or6; 401 hints.ai_socktype = SOCK_STREAM; 402 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) 403 fatal("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 404 for (ai = aitop; ai; ai = ai->ai_next) { 405 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 406 if (s < 0) { 407 error("socket: %s", strerror(errno)); 408 continue; 409 } 410 if (set_nonblock(s) == -1) 411 fatal("%s: set_nonblock(%d)", __func__, s); 412 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 413 errno != EINPROGRESS) 414 error("connect (`%s'): %s", host, strerror(errno)); 415 else 416 break; 417 close(s); 418 s = -1; 419 } 420 freeaddrinfo(aitop); 421 return s; 422 } 423 424 static int 425 conalloc(char *iname, char *oname, int keytype) 426 { 427 char *namebase, *name, *namelist; 428 int s; 429 430 namebase = namelist = xstrdup(iname); 431 432 do { 433 name = xstrsep(&namelist, ","); 434 if (!name) { 435 xfree(namebase); 436 return (-1); 437 } 438 } while ((s = tcpconnect(name)) < 0); 439 440 if (s >= maxfd) 441 fatal("conalloc: fdno %d too high", s); 442 if (fdcon[s].c_status) 443 fatal("conalloc: attempt to reuse fdno %d", s); 444 445 fdcon[s].c_fd = s; 446 fdcon[s].c_status = CS_CON; 447 fdcon[s].c_namebase = namebase; 448 fdcon[s].c_name = name; 449 fdcon[s].c_namelist = namelist; 450 fdcon[s].c_output_name = xstrdup(oname); 451 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 452 fdcon[s].c_len = 4; 453 fdcon[s].c_off = 0; 454 fdcon[s].c_keytype = keytype; 455 gettimeofday(&fdcon[s].c_tv, NULL); 456 fdcon[s].c_tv.tv_sec += timeout; 457 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 458 FD_SET(s, read_wait); 459 ncon++; 460 return (s); 461 } 462 463 static void 464 confree(int s) 465 { 466 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 467 fatal("confree: attempt to free bad fdno %d", s); 468 close(s); 469 xfree(fdcon[s].c_namebase); 470 xfree(fdcon[s].c_output_name); 471 if (fdcon[s].c_status == CS_KEYS) 472 xfree(fdcon[s].c_data); 473 fdcon[s].c_status = CS_UNUSED; 474 fdcon[s].c_keytype = 0; 475 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 476 FD_CLR(s, read_wait); 477 ncon--; 478 } 479 480 static void 481 contouch(int s) 482 { 483 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 484 gettimeofday(&fdcon[s].c_tv, NULL); 485 fdcon[s].c_tv.tv_sec += timeout; 486 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 487 } 488 489 static int 490 conrecycle(int s) 491 { 492 con *c = &fdcon[s]; 493 int ret; 494 495 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 496 confree(s); 497 return (ret); 498 } 499 500 static void 501 congreet(int s) 502 { 503 int n = 0, remote_major = 0, remote_minor = 0; 504 char buf[256], *cp; 505 char remote_version[sizeof buf]; 506 size_t bufsiz; 507 con *c = &fdcon[s]; 508 509 for (;;) { 510 memset(buf, '\0', sizeof(buf)); 511 bufsiz = sizeof(buf); 512 cp = buf; 513 while (bufsiz-- && 514 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 515 if (*cp == '\r') 516 *cp = '\n'; 517 cp++; 518 } 519 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 520 break; 521 } 522 if (n == 0) { 523 switch (errno) { 524 case EPIPE: 525 error("%s: Connection closed by remote host", c->c_name); 526 break; 527 case ECONNREFUSED: 528 break; 529 default: 530 error("read (%s): %s", c->c_name, strerror(errno)); 531 break; 532 } 533 conrecycle(s); 534 return; 535 } 536 if (*cp != '\n' && *cp != '\r') { 537 error("%s: bad greeting", c->c_name); 538 confree(s); 539 return; 540 } 541 *cp = '\0'; 542 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 543 &remote_major, &remote_minor, remote_version) == 3) 544 compat_datafellows(remote_version); 545 else 546 datafellows = 0; 547 if (c->c_keytype != KT_RSA1) { 548 if (!ssh2_capable(remote_major, remote_minor)) { 549 debug("%s doesn't support ssh2", c->c_name); 550 confree(s); 551 return; 552 } 553 } else if (remote_major != 1) { 554 debug("%s doesn't support ssh1", c->c_name); 555 confree(s); 556 return; 557 } 558 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); 559 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 560 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, 561 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); 562 if (n < 0 || (size_t)n >= sizeof(buf)) { 563 error("snprintf: buffer too small"); 564 confree(s); 565 return; 566 } 567 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 568 error("write (%s): %s", c->c_name, strerror(errno)); 569 confree(s); 570 return; 571 } 572 if (c->c_keytype != KT_RSA1) { 573 keyprint(c, keygrab_ssh2(c)); 574 confree(s); 575 return; 576 } 577 c->c_status = CS_SIZE; 578 contouch(s); 579 } 580 581 static void 582 conread(int s) 583 { 584 con *c = &fdcon[s]; 585 size_t n; 586 587 if (c->c_status == CS_CON) { 588 congreet(s); 589 return; 590 } 591 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 592 if (n == 0) { 593 error("read (%s): %s", c->c_name, strerror(errno)); 594 confree(s); 595 return; 596 } 597 c->c_off += n; 598 599 if (c->c_off == c->c_len) 600 switch (c->c_status) { 601 case CS_SIZE: 602 c->c_plen = htonl(c->c_plen); 603 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 604 c->c_off = 0; 605 c->c_data = xmalloc(c->c_len); 606 c->c_status = CS_KEYS; 607 break; 608 case CS_KEYS: 609 keyprint(c, keygrab_ssh1(c)); 610 confree(s); 611 return; 612 default: 613 fatal("conread: invalid status %d", c->c_status); 614 break; 615 } 616 617 contouch(s); 618 } 619 620 static void 621 conloop(void) 622 { 623 struct timeval seltime, now; 624 fd_set *r, *e; 625 con *c; 626 int i; 627 628 gettimeofday(&now, NULL); 629 c = TAILQ_FIRST(&tq); 630 631 if (c && (c->c_tv.tv_sec > now.tv_sec || 632 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 633 seltime = c->c_tv; 634 seltime.tv_sec -= now.tv_sec; 635 seltime.tv_usec -= now.tv_usec; 636 if (seltime.tv_usec < 0) { 637 seltime.tv_usec += 1000000; 638 seltime.tv_sec--; 639 } 640 } else 641 seltime.tv_sec = seltime.tv_usec = 0; 642 643 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 644 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 645 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 646 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 647 648 while (select(maxfd, r, NULL, e, &seltime) == -1 && 649 (errno == EAGAIN || errno == EINTR)) 650 ; 651 652 for (i = 0; i < maxfd; i++) { 653 if (FD_ISSET(i, e)) { 654 error("%s: exception!", fdcon[i].c_name); 655 confree(i); 656 } else if (FD_ISSET(i, r)) 657 conread(i); 658 } 659 xfree(r); 660 xfree(e); 661 662 c = TAILQ_FIRST(&tq); 663 while (c && (c->c_tv.tv_sec < now.tv_sec || 664 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 665 int s = c->c_fd; 666 667 c = TAILQ_NEXT(c, c_link); 668 conrecycle(s); 669 } 670 } 671 672 static void 673 do_host(char *host) 674 { 675 char *name = strnnsep(&host, " \t\n"); 676 int j; 677 678 if (name == NULL) 679 return; 680 for (j = KT_RSA1; j <= KT_RSA; j *= 2) { 681 if (get_keytypes & j) { 682 while (ncon >= MAXCON) 683 conloop(); 684 conalloc(name, *host ? host : name, j); 685 } 686 } 687 } 688 689 void 690 fatal(const char *fmt,...) 691 { 692 va_list args; 693 694 va_start(args, fmt); 695 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 696 va_end(args); 697 if (nonfatal_fatal) 698 longjmp(kexjmp, -1); 699 else 700 exit(255); 701 } 702 703 static void 704 usage(void) 705 { 706 fprintf(stderr, 707 "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" 708 "\t\t [host | addrlist namelist] ...\n", 709 __progname); 710 exit(1); 711 } 712 713 int 714 main(int argc, char **argv) 715 { 716 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 717 int opt, fopt_count = 0; 718 char *tname; 719 720 extern int optind; 721 extern char *optarg; 722 723 TAILQ_INIT(&tq); 724 725 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 726 sanitise_stdfd(); 727 728 if (argc <= 1) 729 usage(); 730 731 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) { 732 switch (opt) { 733 case 'H': 734 hash_hosts = 1; 735 break; 736 case 'p': 737 ssh_port = a2port(optarg); 738 if (ssh_port <= 0) { 739 fprintf(stderr, "Bad port '%s'\n", optarg); 740 exit(1); 741 } 742 break; 743 case 'T': 744 timeout = convtime(optarg); 745 if (timeout == -1 || timeout == 0) { 746 fprintf(stderr, "Bad timeout '%s'\n", optarg); 747 usage(); 748 } 749 break; 750 case 'v': 751 if (!debug_flag) { 752 debug_flag = 1; 753 log_level = SYSLOG_LEVEL_DEBUG1; 754 } 755 else if (log_level < SYSLOG_LEVEL_DEBUG3) 756 log_level++; 757 else 758 fatal("Too high debugging level."); 759 break; 760 case 'f': 761 if (strcmp(optarg, "-") == 0) 762 optarg = NULL; 763 argv[fopt_count++] = optarg; 764 break; 765 case 't': 766 get_keytypes = 0; 767 tname = strtok(optarg, ","); 768 while (tname) { 769 int type = key_type_from_name(tname); 770 switch (type) { 771 case KEY_RSA1: 772 get_keytypes |= KT_RSA1; 773 break; 774 case KEY_DSA: 775 get_keytypes |= KT_DSA; 776 break; 777 case KEY_RSA: 778 get_keytypes |= KT_RSA; 779 break; 780 case KEY_UNSPEC: 781 fatal("unknown key type %s", tname); 782 } 783 tname = strtok(NULL, ","); 784 } 785 break; 786 case '4': 787 IPv4or6 = AF_INET; 788 break; 789 case '6': 790 IPv4or6 = AF_INET6; 791 break; 792 case '?': 793 default: 794 usage(); 795 } 796 } 797 if (optind == argc && !fopt_count) 798 usage(); 799 800 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 801 802 maxfd = fdlim_get(1); 803 if (maxfd < 0) 804 fatal("%s: fdlim_get: bad value", __progname); 805 if (maxfd > MAXMAXFD) 806 maxfd = MAXMAXFD; 807 if (MAXCON <= 0) 808 fatal("%s: not enough file descriptors", __progname); 809 if (maxfd > fdlim_get(0)) 810 fdlim_set(maxfd); 811 fdcon = xcalloc(maxfd, sizeof(con)); 812 813 read_wait_nfdset = howmany(maxfd, NFDBITS); 814 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 815 816 if (fopt_count) { 817 Linebuf *lb; 818 char *line; 819 int j; 820 821 for (j = 0; j < fopt_count; j++) { 822 lb = Linebuf_alloc(argv[j], error); 823 if (!lb) 824 continue; 825 while ((line = Linebuf_getline(lb)) != NULL) 826 do_host(line); 827 Linebuf_free(lb); 828 } 829 } 830 831 while (optind < argc) 832 do_host(argv[optind++]); 833 834 while (ncon > 0) 835 conloop(); 836 837 return (0); 838 } 839