1 /* $OpenBSD: ssh-keyscan.c,v 1.99 2015/01/30 10:44:49 djm Exp $ */ 2 /* 3 * Copyright 1995, 1996 by David Mazieres <dm (at) lcs.mit.edu>. 4 * 5 * Modification and redistribution in source and binary forms is 6 * permitted provided that due credit is given to the author and the 7 * OpenBSD project by leaving this copyright notice intact. 8 */ 9 10 #include "includes.h" 11 12 #include <sys/types.h> 13 #include "openbsd-compat/sys-queue.h" 14 #include <sys/resource.h> 15 #ifdef HAVE_SYS_TIME_H 16 # include <sys/time.h> 17 #endif 18 19 #include <netinet/in.h> 20 #include <arpa/inet.h> 21 22 #include <openssl/bn.h> 23 24 #include <netdb.h> 25 #include <errno.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 "sshbuf.h" 37 #include "sshkey.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 #include "ssherr.h" 49 #include "ssh_api.h" 50 51 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. 52 Default value is AF_UNSPEC means both IPv4 and IPv6. */ 53 int IPv4or6 = AF_UNSPEC; 54 55 int ssh_port = SSH_DEFAULT_PORT; 56 57 #define KT_RSA1 1 58 #define KT_DSA 2 59 #define KT_RSA 4 60 #define KT_ECDSA 8 61 #define KT_ED25519 16 62 63 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519; 64 65 int hash_hosts = 0; /* Hash hostname on output */ 66 67 #define MAXMAXFD 256 68 69 /* The number of seconds after which to give up on a TCP connection */ 70 int timeout = 5; 71 72 int maxfd; 73 #define MAXCON (maxfd - 10) 74 75 extern char *__progname; 76 fd_set *read_wait; 77 size_t read_wait_nfdset; 78 int ncon; 79 80 struct ssh *active_state = NULL; /* XXX needed for linking */ 81 82 /* 83 * Keep a connection structure for each file descriptor. The state 84 * associated with file descriptor n is held in fdcon[n]. 85 */ 86 typedef struct Connection { 87 u_char c_status; /* State of connection on this file desc. */ 88 #define CS_UNUSED 0 /* File descriptor unused */ 89 #define CS_CON 1 /* Waiting to connect/read greeting */ 90 #define CS_SIZE 2 /* Waiting to read initial packet size */ 91 #define CS_KEYS 3 /* Waiting to read public key packet */ 92 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 93 int c_plen; /* Packet length field for ssh packet */ 94 int c_len; /* Total bytes which must be read. */ 95 int c_off; /* Length of data read so far. */ 96 int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */ 97 int c_done; /* SSH2 done */ 98 char *c_namebase; /* Address to free for c_name and c_namelist */ 99 char *c_name; /* Hostname of connection for errors */ 100 char *c_namelist; /* Pointer to other possible addresses */ 101 char *c_output_name; /* Hostname of connection for output */ 102 char *c_data; /* Data read from this fd */ 103 struct ssh *c_ssh; /* SSH-connection */ 104 struct timeval c_tv; /* Time at which connection gets aborted */ 105 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 106 } con; 107 108 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 109 con *fdcon; 110 111 static void keyprint(con *c, struct sshkey *key); 112 113 static int 114 fdlim_get(int hard) 115 { 116 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE) 117 struct rlimit rlfd; 118 119 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 120 return (-1); 121 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 122 return SSH_SYSFDMAX; 123 else 124 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 125 #else 126 return SSH_SYSFDMAX; 127 #endif 128 } 129 130 static int 131 fdlim_set(int lim) 132 { 133 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) 134 struct rlimit rlfd; 135 #endif 136 137 if (lim <= 0) 138 return (-1); 139 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE) 140 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 141 return (-1); 142 rlfd.rlim_cur = lim; 143 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) 144 return (-1); 145 #elif defined (HAVE_SETDTABLESIZE) 146 setdtablesize(lim); 147 #endif 148 return (0); 149 } 150 151 /* 152 * This is an strsep function that returns a null field for adjacent 153 * separators. This is the same as the 4.4BSD strsep, but different from the 154 * one in the GNU libc. 155 */ 156 static char * 157 xstrsep(char **str, const char *delim) 158 { 159 char *s, *e; 160 161 if (!**str) 162 return (NULL); 163 164 s = *str; 165 e = s + strcspn(s, delim); 166 167 if (*e != '\0') 168 *e++ = '\0'; 169 *str = e; 170 171 return (s); 172 } 173 174 /* 175 * Get the next non-null token (like GNU strsep). Strsep() will return a 176 * null token for two adjacent separators, so we may have to loop. 177 */ 178 static char * 179 strnnsep(char **stringp, char *delim) 180 { 181 char *tok; 182 183 do { 184 tok = xstrsep(stringp, delim); 185 } while (tok && *tok == '\0'); 186 return (tok); 187 } 188 189 #ifdef WITH_SSH1 190 static struct sshkey * 191 keygrab_ssh1(con *c) 192 { 193 static struct sshkey *rsa; 194 static struct sshbuf *msg; 195 int r; 196 u_char type; 197 198 if (rsa == NULL) { 199 if ((rsa = sshkey_new(KEY_RSA1)) == NULL) { 200 error("%s: sshkey_new failed", __func__); 201 return NULL; 202 } 203 if ((msg = sshbuf_new()) == NULL) 204 fatal("%s: sshbuf_new failed", __func__); 205 } 206 if ((r = sshbuf_put(msg, c->c_data, c->c_plen)) != 0 || 207 (r = sshbuf_consume(msg, 8 - (c->c_plen & 7))) != 0 || /* padding */ 208 (r = sshbuf_get_u8(msg, &type)) != 0) 209 goto buf_err; 210 if (type != (int) SSH_SMSG_PUBLIC_KEY) { 211 error("%s: invalid packet type", c->c_name); 212 sshbuf_reset(msg); 213 return NULL; 214 } 215 if ((r = sshbuf_consume(msg, 8)) != 0 || /* cookie */ 216 /* server key */ 217 (r = sshbuf_get_u32(msg, NULL)) != 0 || 218 (r = sshbuf_get_bignum1(msg, NULL)) != 0 || 219 (r = sshbuf_get_bignum1(msg, NULL)) != 0 || 220 /* host key */ 221 (r = sshbuf_get_u32(msg, NULL)) != 0 || 222 (r = sshbuf_get_bignum1(msg, rsa->rsa->e)) != 0 || 223 (r = sshbuf_get_bignum1(msg, rsa->rsa->n)) != 0) { 224 buf_err: 225 error("%s: buffer error: %s", __func__, ssh_err(r)); 226 sshbuf_reset(msg); 227 return NULL; 228 } 229 230 sshbuf_reset(msg); 231 232 return (rsa); 233 } 234 #endif 235 236 static int 237 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh) 238 { 239 con *c; 240 241 if ((c = ssh_get_app_data(ssh)) != NULL) 242 keyprint(c, hostkey); 243 /* always abort key exchange */ 244 return -1; 245 } 246 247 static int 248 ssh2_capable(int remote_major, int remote_minor) 249 { 250 switch (remote_major) { 251 case 1: 252 if (remote_minor == 99) 253 return 1; 254 break; 255 case 2: 256 return 1; 257 default: 258 break; 259 } 260 return 0; 261 } 262 263 static void 264 keygrab_ssh2(con *c) 265 { 266 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; 267 int r; 268 269 enable_compat20(); 270 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = 271 c->c_keytype == KT_DSA ? "ssh-dss" : 272 (c->c_keytype == KT_RSA ? "ssh-rsa" : 273 (c->c_keytype == KT_ED25519 ? "ssh-ed25519" : 274 "ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521")); 275 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) { 276 free(c->c_ssh); 277 fprintf(stderr, "kex_setup: %s\n", ssh_err(r)); 278 exit(1); 279 } 280 #ifdef WITH_OPENSSL 281 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; 282 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; 283 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 284 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 285 # ifdef OPENSSL_HAS_ECC 286 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client; 287 # endif 288 #endif 289 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client; 290 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 291 /* 292 * do the key-exchange until an error occurs or until 293 * the key_print_wrapper() callback sets c_done. 294 */ 295 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done, c->c_ssh); 296 } 297 298 static void 299 keyprint(con *c, struct sshkey *key) 300 { 301 char *host = c->c_output_name ? c->c_output_name : c->c_name; 302 303 if (!key) 304 return; 305 if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL) 306 fatal("host_hash failed"); 307 308 fprintf(stdout, "%s ", host); 309 sshkey_write(key, stdout); 310 fputs("\n", stdout); 311 } 312 313 static int 314 tcpconnect(char *host) 315 { 316 struct addrinfo hints, *ai, *aitop; 317 char strport[NI_MAXSERV]; 318 int gaierr, s = -1; 319 320 snprintf(strport, sizeof strport, "%d", ssh_port); 321 memset(&hints, 0, sizeof(hints)); 322 hints.ai_family = IPv4or6; 323 hints.ai_socktype = SOCK_STREAM; 324 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 325 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 326 return -1; 327 } 328 for (ai = aitop; ai; ai = ai->ai_next) { 329 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 330 if (s < 0) { 331 error("socket: %s", strerror(errno)); 332 continue; 333 } 334 if (set_nonblock(s) == -1) 335 fatal("%s: set_nonblock(%d)", __func__, s); 336 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 337 errno != EINPROGRESS) 338 error("connect (`%s'): %s", host, strerror(errno)); 339 else 340 break; 341 close(s); 342 s = -1; 343 } 344 freeaddrinfo(aitop); 345 return s; 346 } 347 348 static int 349 conalloc(char *iname, char *oname, int keytype) 350 { 351 char *namebase, *name, *namelist; 352 int s; 353 354 namebase = namelist = xstrdup(iname); 355 356 do { 357 name = xstrsep(&namelist, ","); 358 if (!name) { 359 free(namebase); 360 return (-1); 361 } 362 } while ((s = tcpconnect(name)) < 0); 363 364 if (s >= maxfd) 365 fatal("conalloc: fdno %d too high", s); 366 if (fdcon[s].c_status) 367 fatal("conalloc: attempt to reuse fdno %d", s); 368 369 fdcon[s].c_fd = s; 370 fdcon[s].c_status = CS_CON; 371 fdcon[s].c_namebase = namebase; 372 fdcon[s].c_name = name; 373 fdcon[s].c_namelist = namelist; 374 fdcon[s].c_output_name = xstrdup(oname); 375 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 376 fdcon[s].c_len = 4; 377 fdcon[s].c_off = 0; 378 fdcon[s].c_keytype = keytype; 379 gettimeofday(&fdcon[s].c_tv, NULL); 380 fdcon[s].c_tv.tv_sec += timeout; 381 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 382 FD_SET(s, read_wait); 383 ncon++; 384 return (s); 385 } 386 387 static void 388 confree(int s) 389 { 390 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 391 fatal("confree: attempt to free bad fdno %d", s); 392 close(s); 393 free(fdcon[s].c_namebase); 394 free(fdcon[s].c_output_name); 395 if (fdcon[s].c_status == CS_KEYS) 396 free(fdcon[s].c_data); 397 fdcon[s].c_status = CS_UNUSED; 398 fdcon[s].c_keytype = 0; 399 if (fdcon[s].c_ssh) { 400 ssh_packet_close(fdcon[s].c_ssh); 401 free(fdcon[s].c_ssh); 402 fdcon[s].c_ssh = NULL; 403 } 404 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 405 FD_CLR(s, read_wait); 406 ncon--; 407 } 408 409 static void 410 contouch(int s) 411 { 412 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 413 gettimeofday(&fdcon[s].c_tv, NULL); 414 fdcon[s].c_tv.tv_sec += timeout; 415 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 416 } 417 418 static int 419 conrecycle(int s) 420 { 421 con *c = &fdcon[s]; 422 int ret; 423 424 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 425 confree(s); 426 return (ret); 427 } 428 429 static void 430 congreet(int s) 431 { 432 int n = 0, remote_major = 0, remote_minor = 0; 433 char buf[256], *cp; 434 char remote_version[sizeof buf]; 435 size_t bufsiz; 436 con *c = &fdcon[s]; 437 438 for (;;) { 439 memset(buf, '\0', sizeof(buf)); 440 bufsiz = sizeof(buf); 441 cp = buf; 442 while (bufsiz-- && 443 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 444 if (*cp == '\r') 445 *cp = '\n'; 446 cp++; 447 } 448 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 449 break; 450 } 451 if (n == 0) { 452 switch (errno) { 453 case EPIPE: 454 error("%s: Connection closed by remote host", c->c_name); 455 break; 456 case ECONNREFUSED: 457 break; 458 default: 459 error("read (%s): %s", c->c_name, strerror(errno)); 460 break; 461 } 462 conrecycle(s); 463 return; 464 } 465 if (*cp != '\n' && *cp != '\r') { 466 error("%s: bad greeting", c->c_name); 467 confree(s); 468 return; 469 } 470 *cp = '\0'; 471 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 472 fatal("ssh_packet_set_connection failed"); 473 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 474 ssh_set_app_data(c->c_ssh, c); /* back link */ 475 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 476 &remote_major, &remote_minor, remote_version) == 3) 477 c->c_ssh->compat = compat_datafellows(remote_version); 478 else 479 c->c_ssh->compat = 0; 480 if (c->c_keytype != KT_RSA1) { 481 if (!ssh2_capable(remote_major, remote_minor)) { 482 debug("%s doesn't support ssh2", c->c_name); 483 confree(s); 484 return; 485 } 486 } else if (remote_major != 1) { 487 debug("%s doesn't support ssh1", c->c_name); 488 confree(s); 489 return; 490 } 491 fprintf(stderr, "# %s %s\n", c->c_name, chop(buf)); 492 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 493 c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2, 494 c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2); 495 if (n < 0 || (size_t)n >= sizeof(buf)) { 496 error("snprintf: buffer too small"); 497 confree(s); 498 return; 499 } 500 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 501 error("write (%s): %s", c->c_name, strerror(errno)); 502 confree(s); 503 return; 504 } 505 if (c->c_keytype != KT_RSA1) { 506 keygrab_ssh2(c); 507 confree(s); 508 return; 509 } 510 c->c_status = CS_SIZE; 511 contouch(s); 512 } 513 514 static void 515 conread(int s) 516 { 517 con *c = &fdcon[s]; 518 size_t n; 519 520 if (c->c_status == CS_CON) { 521 congreet(s); 522 return; 523 } 524 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 525 if (n == 0) { 526 error("read (%s): %s", c->c_name, strerror(errno)); 527 confree(s); 528 return; 529 } 530 c->c_off += n; 531 532 if (c->c_off == c->c_len) 533 switch (c->c_status) { 534 case CS_SIZE: 535 c->c_plen = htonl(c->c_plen); 536 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 537 c->c_off = 0; 538 c->c_data = xmalloc(c->c_len); 539 c->c_status = CS_KEYS; 540 break; 541 #ifdef WITH_SSH1 542 case CS_KEYS: 543 keyprint(c, keygrab_ssh1(c)); 544 confree(s); 545 return; 546 #endif 547 default: 548 fatal("conread: invalid status %d", c->c_status); 549 break; 550 } 551 552 contouch(s); 553 } 554 555 static void 556 conloop(void) 557 { 558 struct timeval seltime, now; 559 fd_set *r, *e; 560 con *c; 561 int i; 562 563 gettimeofday(&now, NULL); 564 c = TAILQ_FIRST(&tq); 565 566 if (c && (c->c_tv.tv_sec > now.tv_sec || 567 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 568 seltime = c->c_tv; 569 seltime.tv_sec -= now.tv_sec; 570 seltime.tv_usec -= now.tv_usec; 571 if (seltime.tv_usec < 0) { 572 seltime.tv_usec += 1000000; 573 seltime.tv_sec--; 574 } 575 } else 576 timerclear(&seltime); 577 578 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 579 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 580 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 581 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 582 583 while (select(maxfd, r, NULL, e, &seltime) == -1 && 584 (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK)) 585 ; 586 587 for (i = 0; i < maxfd; i++) { 588 if (FD_ISSET(i, e)) { 589 error("%s: exception!", fdcon[i].c_name); 590 confree(i); 591 } else if (FD_ISSET(i, r)) 592 conread(i); 593 } 594 free(r); 595 free(e); 596 597 c = TAILQ_FIRST(&tq); 598 while (c && (c->c_tv.tv_sec < now.tv_sec || 599 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 600 int s = c->c_fd; 601 602 c = TAILQ_NEXT(c, c_link); 603 conrecycle(s); 604 } 605 } 606 607 static void 608 do_host(char *host) 609 { 610 char *name = strnnsep(&host, " \t\n"); 611 int j; 612 613 if (name == NULL) 614 return; 615 for (j = KT_RSA1; j <= KT_ED25519; j *= 2) { 616 if (get_keytypes & j) { 617 while (ncon >= MAXCON) 618 conloop(); 619 conalloc(name, *host ? host : name, j); 620 } 621 } 622 } 623 624 void 625 fatal(const char *fmt,...) 626 { 627 va_list args; 628 629 va_start(args, fmt); 630 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 631 va_end(args); 632 exit(255); 633 } 634 635 static void 636 usage(void) 637 { 638 fprintf(stderr, 639 "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n" 640 "\t\t [host | addrlist namelist] ...\n", 641 __progname); 642 exit(1); 643 } 644 645 int 646 main(int argc, char **argv) 647 { 648 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 649 int opt, fopt_count = 0, j; 650 char *tname, *cp, line[NI_MAXHOST]; 651 FILE *fp; 652 u_long linenum; 653 654 extern int optind; 655 extern char *optarg; 656 657 __progname = ssh_get_progname(argv[0]); 658 seed_rng(); 659 TAILQ_INIT(&tq); 660 661 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 662 sanitise_stdfd(); 663 664 if (argc <= 1) 665 usage(); 666 667 while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) { 668 switch (opt) { 669 case 'H': 670 hash_hosts = 1; 671 break; 672 case 'p': 673 ssh_port = a2port(optarg); 674 if (ssh_port <= 0) { 675 fprintf(stderr, "Bad port '%s'\n", optarg); 676 exit(1); 677 } 678 break; 679 case 'T': 680 timeout = convtime(optarg); 681 if (timeout == -1 || timeout == 0) { 682 fprintf(stderr, "Bad timeout '%s'\n", optarg); 683 usage(); 684 } 685 break; 686 case 'v': 687 if (!debug_flag) { 688 debug_flag = 1; 689 log_level = SYSLOG_LEVEL_DEBUG1; 690 } 691 else if (log_level < SYSLOG_LEVEL_DEBUG3) 692 log_level++; 693 else 694 fatal("Too high debugging level."); 695 break; 696 case 'f': 697 if (strcmp(optarg, "-") == 0) 698 optarg = NULL; 699 argv[fopt_count++] = optarg; 700 break; 701 case 't': 702 get_keytypes = 0; 703 tname = strtok(optarg, ","); 704 while (tname) { 705 int type = sshkey_type_from_name(tname); 706 switch (type) { 707 case KEY_RSA1: 708 get_keytypes |= KT_RSA1; 709 break; 710 case KEY_DSA: 711 get_keytypes |= KT_DSA; 712 break; 713 case KEY_ECDSA: 714 get_keytypes |= KT_ECDSA; 715 break; 716 case KEY_RSA: 717 get_keytypes |= KT_RSA; 718 break; 719 case KEY_ED25519: 720 get_keytypes |= KT_ED25519; 721 break; 722 case KEY_UNSPEC: 723 fatal("unknown key type %s", tname); 724 } 725 tname = strtok(NULL, ","); 726 } 727 break; 728 case '4': 729 IPv4or6 = AF_INET; 730 break; 731 case '6': 732 IPv4or6 = AF_INET6; 733 break; 734 case '?': 735 default: 736 usage(); 737 } 738 } 739 if (optind == argc && !fopt_count) 740 usage(); 741 742 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 743 744 maxfd = fdlim_get(1); 745 if (maxfd < 0) 746 fatal("%s: fdlim_get: bad value", __progname); 747 if (maxfd > MAXMAXFD) 748 maxfd = MAXMAXFD; 749 if (MAXCON <= 0) 750 fatal("%s: not enough file descriptors", __progname); 751 if (maxfd > fdlim_get(0)) 752 fdlim_set(maxfd); 753 fdcon = xcalloc(maxfd, sizeof(con)); 754 755 read_wait_nfdset = howmany(maxfd, NFDBITS); 756 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 757 758 for (j = 0; j < fopt_count; j++) { 759 if (argv[j] == NULL) 760 fp = stdin; 761 else if ((fp = fopen(argv[j], "r")) == NULL) 762 fatal("%s: %s: %s", __progname, argv[j], 763 strerror(errno)); 764 linenum = 0; 765 766 while (read_keyfile_line(fp, 767 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line), 768 &linenum) != -1) { 769 /* Chomp off trailing whitespace and comments */ 770 if ((cp = strchr(line, '#')) == NULL) 771 cp = line + strlen(line) - 1; 772 while (cp >= line) { 773 if (*cp == ' ' || *cp == '\t' || 774 *cp == '\n' || *cp == '#') 775 *cp-- = '\0'; 776 else 777 break; 778 } 779 780 /* Skip empty lines */ 781 if (*line == '\0') 782 continue; 783 784 do_host(line); 785 } 786 787 if (ferror(fp)) 788 fatal("%s: %s: %s", __progname, argv[j], 789 strerror(errno)); 790 791 fclose(fp); 792 } 793 794 while (optind < argc) 795 do_host(argv[optind++]); 796 797 while (ncon > 0) 798 conloop(); 799 800 return (0); 801 } 802
