1 /* $NetBSD: ssh-keyscan.c,v 1.24 2019/04/20 17:16:40 christos Exp $ */ 2 /* $OpenBSD: ssh-keyscan.c,v 1.126 2019/01/26 22:35:01 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 1.24 2019/04/20 17:16:40 christos 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 <stdarg.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <signal.h> 29 #include <string.h> 30 #include <unistd.h> 31 32 #include "xmalloc.h" 33 #include "ssh.h" 34 #include "sshbuf.h" 35 #include "sshkey.h" 36 #include "cipher.h" 37 #include "kex.h" 38 #include "compat.h" 39 #include "myproposal.h" 40 #include "packet.h" 41 #include "dispatch.h" 42 #include "log.h" 43 #include "atomicio.h" 44 #include "misc.h" 45 #include "hostfile.h" 46 #include "ssherr.h" 47 #include "ssh_api.h" 48 #include "dns.h" 49 50 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. 51 Default value is AF_UNSPEC means both IPv4 and IPv6. */ 52 int IPv4or6 = AF_UNSPEC; 53 54 int ssh_port = SSH_DEFAULT_PORT; 55 56 #define KT_DSA (1) 57 #define KT_RSA (1<<1) 58 #define KT_ECDSA (1<<2) 59 #define KT_ED25519 (1<<3) 60 #define KT_XMSS (1<<4) 61 62 #define KT_MIN KT_DSA 63 #define KT_MAX KT_XMSS 64 65 int get_cert = 0; 66 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519; 67 68 int hash_hosts = 0; /* Hash hostname on output */ 69 70 int print_sshfp = 0; /* Print SSHFP records instead of known_hosts */ 71 72 int found_one = 0; /* Successfully found a key */ 73 74 #define MAXMAXFD 256 75 76 /* The number of seconds after which to give up on a TCP connection */ 77 int timeout = 5; 78 79 int maxfd; 80 #define MAXCON (maxfd - 10) 81 82 extern char *__progname; 83 fd_set *read_wait; 84 size_t read_wait_nfdset; 85 int ncon; 86 87 /* 88 * Keep a connection structure for each file descriptor. The state 89 * associated with file descriptor n is held in fdcon[n]. 90 */ 91 typedef struct Connection { 92 u_char c_status; /* State of connection on this file desc. */ 93 #define CS_UNUSED 0 /* File descriptor unused */ 94 #define CS_CON 1 /* Waiting to connect/read greeting */ 95 #define CS_SIZE 2 /* Waiting to read initial packet size */ 96 #define CS_KEYS 3 /* Waiting to read public key packet */ 97 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 98 int c_plen; /* Packet length field for ssh packet */ 99 int c_len; /* Total bytes which must be read. */ 100 int c_off; /* Length of data read so far. */ 101 int c_keytype; /* Only one of KT_* */ 102 sig_atomic_t c_done; /* SSH2 done */ 103 char *c_namebase; /* Address to free for c_name and c_namelist */ 104 char *c_name; /* Hostname of connection for errors */ 105 char *c_namelist; /* Pointer to other possible addresses */ 106 char *c_output_name; /* Hostname of connection for output */ 107 char *c_data; /* Data read from this fd */ 108 struct ssh *c_ssh; /* SSH-connection */ 109 struct timeval c_tv; /* Time at which connection gets aborted */ 110 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 111 } con; 112 113 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 114 con *fdcon; 115 116 static void keyprint(con *c, struct sshkey *key); 117 118 static int 119 fdlim_get(int hard) 120 { 121 struct rlimit rlfd; 122 123 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 124 return (-1); 125 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 126 return sysconf(_SC_OPEN_MAX); 127 else 128 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 129 } 130 131 static int 132 fdlim_set(int lim) 133 { 134 struct rlimit rlfd; 135 136 if (lim <= 0) 137 return (-1); 138 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 139 return (-1); 140 rlfd.rlim_cur = lim; 141 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) 142 return (-1); 143 return (0); 144 } 145 146 /* 147 * This is an strsep function that returns a null field for adjacent 148 * separators. This is the same as the 4.4BSD strsep, but different from the 149 * one in the GNU libc. 150 */ 151 static char * 152 xstrsep(char **str, const char *delim) 153 { 154 char *s, *e; 155 156 if (!**str) 157 return (NULL); 158 159 s = *str; 160 e = s + strcspn(s, delim); 161 162 if (*e != '\0') 163 *e++ = '\0'; 164 *str = e; 165 166 return (s); 167 } 168 169 /* 170 * Get the next non-null token (like GNU strsep). Strsep() will return a 171 * null token for two adjacent separators, so we may have to loop. 172 */ 173 static char * 174 strnnsep(char **stringp, const char *delim) 175 { 176 char *tok; 177 178 do { 179 tok = xstrsep(stringp, delim); 180 } while (tok && *tok == '\0'); 181 return (tok); 182 } 183 184 185 static int 186 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh) 187 { 188 con *c; 189 190 if ((c = ssh_get_app_data(ssh)) != NULL) 191 keyprint(c, hostkey); 192 /* always abort key exchange */ 193 return -1; 194 } 195 196 static int 197 ssh2_capable(int remote_major, int remote_minor) 198 { 199 switch (remote_major) { 200 case 1: 201 if (remote_minor == 99) 202 return 1; 203 break; 204 case 2: 205 return 1; 206 default: 207 break; 208 } 209 return 0; 210 } 211 212 static void 213 keygrab_ssh2(con *c) 214 { 215 const char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; 216 int r; 217 218 switch (c->c_keytype) { 219 case KT_DSA: 220 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 221 "ssh-dss-cert-v01@openssh.com" : "ssh-dss"; 222 break; 223 case KT_RSA: 224 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 225 "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa"; 226 break; 227 case KT_ED25519: 228 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 229 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519"; 230 break; 231 case KT_XMSS: 232 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 233 "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com"; 234 break; 235 case KT_ECDSA: 236 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 237 "ecdsa-sha2-nistp256-cert-v01@openssh.com," 238 "ecdsa-sha2-nistp384-cert-v01@openssh.com," 239 "ecdsa-sha2-nistp521-cert-v01@openssh.com" : 240 "ecdsa-sha2-nistp256," 241 "ecdsa-sha2-nistp384," 242 "ecdsa-sha2-nistp521"; 243 break; 244 default: 245 fatal("unknown key type %d", c->c_keytype); 246 break; 247 } 248 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) { 249 free(c->c_ssh); 250 fprintf(stderr, "kex_setup: %s\n", ssh_err(r)); 251 exit(1); 252 } 253 #ifdef WITH_OPENSSL 254 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client; 255 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client; 256 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client; 257 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client; 258 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client; 259 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 260 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 261 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client; 262 #endif 263 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client; 264 c->c_ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_client; 265 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 266 /* 267 * do the key-exchange until an error occurs or until 268 * the key_print_wrapper() callback sets c_done. 269 */ 270 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done); 271 } 272 273 static void 274 keyprint_one(const char *host, struct sshkey *key) 275 { 276 char *hostport; 277 const char *known_host, *hashed; 278 279 found_one = 1; 280 281 if (print_sshfp) { 282 export_dns_rr(host, key, stdout, 0); 283 return; 284 } 285 286 hostport = put_host_port(host, ssh_port); 287 lowercase(hostport); 288 if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL) 289 fatal("host_hash failed"); 290 known_host = hash_hosts ? hashed : hostport; 291 if (!get_cert) 292 fprintf(stdout, "%s ", known_host); 293 sshkey_write(key, stdout); 294 fputs("\n", stdout); 295 free(hostport); 296 } 297 298 static void 299 keyprint(con *c, struct sshkey *key) 300 { 301 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 302 char *host, *ohosts; 303 304 if (key == NULL) 305 return; 306 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 307 keyprint_one(hosts, key); 308 return; 309 } 310 ohosts = hosts = xstrdup(hosts); 311 while ((host = strsep(&hosts, ",")) != NULL) 312 keyprint_one(host, key); 313 free(ohosts); 314 } 315 316 static int 317 tcpconnect(char *host) 318 { 319 struct addrinfo hints, *ai, *aitop; 320 char strport[NI_MAXSERV]; 321 int gaierr, s = -1; 322 323 snprintf(strport, sizeof strport, "%d", ssh_port); 324 memset(&hints, 0, sizeof(hints)); 325 hints.ai_family = IPv4or6; 326 hints.ai_socktype = SOCK_STREAM; 327 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 328 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 329 return -1; 330 } 331 for (ai = aitop; ai; ai = ai->ai_next) { 332 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 333 if (s < 0) { 334 error("socket: %s", strerror(errno)); 335 continue; 336 } 337 if (set_nonblock(s) == -1) 338 fatal("%s: set_nonblock(%d)", __func__, s); 339 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 340 errno != EINPROGRESS) 341 error("connect (`%s'): %s", host, strerror(errno)); 342 else 343 break; 344 close(s); 345 s = -1; 346 } 347 freeaddrinfo(aitop); 348 return s; 349 } 350 351 static int 352 conalloc(char *iname, char *oname, int keytype) 353 { 354 char *namebase, *name, *namelist; 355 int s; 356 357 namebase = namelist = xstrdup(iname); 358 359 do { 360 name = xstrsep(&namelist, ","); 361 if (!name) { 362 free(namebase); 363 return (-1); 364 } 365 } while ((s = tcpconnect(name)) < 0); 366 367 if (s >= maxfd) 368 fatal("conalloc: fdno %d too high", s); 369 if (fdcon[s].c_status) 370 fatal("conalloc: attempt to reuse fdno %d", s); 371 372 debug3("%s: oname %s kt %d", __func__, oname, keytype); 373 fdcon[s].c_fd = s; 374 fdcon[s].c_status = CS_CON; 375 fdcon[s].c_namebase = namebase; 376 fdcon[s].c_name = name; 377 fdcon[s].c_namelist = namelist; 378 fdcon[s].c_output_name = xstrdup(oname); 379 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 380 fdcon[s].c_len = 4; 381 fdcon[s].c_off = 0; 382 fdcon[s].c_keytype = keytype; 383 monotime_tv(&fdcon[s].c_tv); 384 fdcon[s].c_tv.tv_sec += timeout; 385 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 386 FD_SET(s, read_wait); 387 ncon++; 388 return (s); 389 } 390 391 static void 392 confree(int s) 393 { 394 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 395 fatal("confree: attempt to free bad fdno %d", s); 396 free(fdcon[s].c_namebase); 397 free(fdcon[s].c_output_name); 398 if (fdcon[s].c_status == CS_KEYS) 399 free(fdcon[s].c_data); 400 fdcon[s].c_status = CS_UNUSED; 401 fdcon[s].c_keytype = 0; 402 if (fdcon[s].c_ssh) { 403 ssh_packet_close(fdcon[s].c_ssh); 404 free(fdcon[s].c_ssh); 405 fdcon[s].c_ssh = NULL; 406 } else 407 close(s); 408 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 409 FD_CLR(s, read_wait); 410 ncon--; 411 } 412 413 static void 414 contouch(int s) 415 { 416 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 417 monotime_tv(&fdcon[s].c_tv); 418 fdcon[s].c_tv.tv_sec += timeout; 419 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 420 } 421 422 static int 423 conrecycle(int s) 424 { 425 con *c = &fdcon[s]; 426 int ret; 427 428 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 429 confree(s); 430 return (ret); 431 } 432 433 static void 434 congreet(int s) 435 { 436 int n = 0, remote_major = 0, remote_minor = 0; 437 char buf[256], *cp; 438 char remote_version[sizeof buf]; 439 size_t bufsiz; 440 con *c = &fdcon[s]; 441 442 /* send client banner */ 443 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 444 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); 445 if (n < 0 || (size_t)n >= sizeof(buf)) { 446 error("snprintf: buffer too small"); 447 confree(s); 448 return; 449 } 450 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 451 error("write (%s): %s", c->c_name, strerror(errno)); 452 confree(s); 453 return; 454 } 455 456 for (;;) { 457 memset(buf, '\0', sizeof(buf)); 458 bufsiz = sizeof(buf); 459 cp = buf; 460 while (bufsiz-- && 461 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 462 if (*cp == '\r') 463 *cp = '\n'; 464 cp++; 465 } 466 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 467 break; 468 } 469 if (n == 0) { 470 switch (errno) { 471 case EPIPE: 472 error("%s: Connection closed by remote host", c->c_name); 473 break; 474 case ECONNREFUSED: 475 break; 476 default: 477 error("read (%s): %s", c->c_name, strerror(errno)); 478 break; 479 } 480 conrecycle(s); 481 return; 482 } 483 if (*cp != '\n' && *cp != '\r') { 484 error("%s: bad greeting", c->c_name); 485 confree(s); 486 return; 487 } 488 *cp = '\0'; 489 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 490 fatal("ssh_packet_set_connection failed"); 491 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 492 ssh_set_app_data(c->c_ssh, c); /* back link */ 493 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 494 &remote_major, &remote_minor, remote_version) == 3) 495 c->c_ssh->compat = compat_datafellows(remote_version); 496 else 497 c->c_ssh->compat = 0; 498 if (!ssh2_capable(remote_major, remote_minor)) { 499 debug("%s doesn't support ssh2", c->c_name); 500 confree(s); 501 return; 502 } 503 fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#', 504 c->c_name, ssh_port, chop(buf)); 505 keygrab_ssh2(c); 506 confree(s); 507 } 508 509 static void 510 conread(int s) 511 { 512 con *c = &fdcon[s]; 513 size_t n; 514 515 if (c->c_status == CS_CON) { 516 congreet(s); 517 return; 518 } 519 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 520 if (n == 0) { 521 error("read (%s): %s", c->c_name, strerror(errno)); 522 confree(s); 523 return; 524 } 525 c->c_off += n; 526 527 if (c->c_off == c->c_len) 528 switch (c->c_status) { 529 case CS_SIZE: 530 c->c_plen = htonl(c->c_plen); 531 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 532 c->c_off = 0; 533 c->c_data = xmalloc(c->c_len); 534 c->c_status = CS_KEYS; 535 break; 536 default: 537 fatal("conread: invalid status %d", c->c_status); 538 break; 539 } 540 541 contouch(s); 542 } 543 544 static void 545 conloop(void) 546 { 547 struct timeval seltime, now; 548 fd_set *r, *e; 549 con *c; 550 int i; 551 552 monotime_tv(&now); 553 c = TAILQ_FIRST(&tq); 554 555 if (c && (c->c_tv.tv_sec > now.tv_sec || 556 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 557 seltime = c->c_tv; 558 seltime.tv_sec -= now.tv_sec; 559 seltime.tv_usec -= now.tv_usec; 560 if (seltime.tv_usec < 0) { 561 seltime.tv_usec += 1000000; 562 seltime.tv_sec--; 563 } 564 } else 565 timerclear(&seltime); 566 567 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 568 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 569 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 570 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 571 572 while (select(maxfd, r, NULL, e, &seltime) == -1 && 573 (errno == EAGAIN || errno == EINTR)) 574 ; 575 576 for (i = 0; i < maxfd; i++) { 577 if (FD_ISSET(i, e)) { 578 error("%s: exception!", fdcon[i].c_name); 579 confree(i); 580 } else if (FD_ISSET(i, r)) 581 conread(i); 582 } 583 free(r); 584 free(e); 585 586 c = TAILQ_FIRST(&tq); 587 while (c && (c->c_tv.tv_sec < now.tv_sec || 588 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 589 int s = c->c_fd; 590 591 c = TAILQ_NEXT(c, c_link); 592 conrecycle(s); 593 } 594 } 595 596 static void 597 do_host(char *host) 598 { 599 char *name = strnnsep(&host, " \t\n"); 600 int j; 601 602 if (name == NULL) 603 return; 604 for (j = KT_MIN; j <= KT_MAX; j *= 2) { 605 if (get_keytypes & j) { 606 while (ncon >= MAXCON) 607 conloop(); 608 conalloc(name, *host ? host : name, j); 609 } 610 } 611 } 612 613 __dead void 614 fatal(const char *fmt,...) 615 { 616 va_list args; 617 618 va_start(args, fmt); 619 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 620 va_end(args); 621 exit(255); 622 } 623 624 __dead static void 625 usage(void) 626 { 627 fprintf(stderr, 628 "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n" 629 "\t\t [host | addrlist namelist]\n", 630 __progname); 631 exit(1); 632 } 633 634 int 635 main(int argc, char **argv) 636 { 637 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 638 int opt, fopt_count = 0, j; 639 char *tname, *cp, *line = NULL; 640 size_t linesize = 0; 641 FILE *fp; 642 643 extern int optind; 644 extern char *optarg; 645 646 ssh_malloc_init(); /* must be called before any mallocs */ 647 TAILQ_INIT(&tq); 648 649 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 650 sanitise_stdfd(); 651 652 if (argc <= 1) 653 usage(); 654 655 while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) { 656 switch (opt) { 657 case 'H': 658 hash_hosts = 1; 659 break; 660 case 'c': 661 get_cert = 1; 662 break; 663 case 'D': 664 print_sshfp = 1; 665 break; 666 case 'p': 667 ssh_port = a2port(optarg); 668 if (ssh_port <= 0) { 669 fprintf(stderr, "Bad port '%s'\n", optarg); 670 exit(1); 671 } 672 break; 673 case 'T': 674 timeout = convtime(optarg); 675 if (timeout == -1 || timeout == 0) { 676 fprintf(stderr, "Bad timeout '%s'\n", optarg); 677 usage(); 678 } 679 break; 680 case 'v': 681 if (!debug_flag) { 682 debug_flag = 1; 683 log_level = SYSLOG_LEVEL_DEBUG1; 684 } 685 else if (log_level < SYSLOG_LEVEL_DEBUG3) 686 log_level++; 687 else 688 fatal("Too high debugging level."); 689 break; 690 case 'f': 691 if (strcmp(optarg, "-") == 0) 692 optarg = NULL; 693 argv[fopt_count++] = optarg; 694 break; 695 case 't': 696 get_keytypes = 0; 697 tname = strtok(optarg, ","); 698 while (tname) { 699 int type = sshkey_type_from_name(tname); 700 701 switch (type) { 702 case KEY_DSA: 703 get_keytypes |= KT_DSA; 704 break; 705 case KEY_ECDSA: 706 get_keytypes |= KT_ECDSA; 707 break; 708 case KEY_RSA: 709 get_keytypes |= KT_RSA; 710 break; 711 case KEY_ED25519: 712 get_keytypes |= KT_ED25519; 713 break; 714 case KEY_XMSS: 715 get_keytypes |= KT_XMSS; 716 break; 717 case KEY_UNSPEC: 718 default: 719 fatal("Unknown key type \"%s\"", tname); 720 } 721 tname = strtok(NULL, ","); 722 } 723 break; 724 case '4': 725 IPv4or6 = AF_INET; 726 break; 727 case '6': 728 IPv4or6 = AF_INET6; 729 break; 730 case '?': 731 default: 732 usage(); 733 } 734 } 735 if (optind == argc && !fopt_count) 736 usage(); 737 738 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 739 740 maxfd = fdlim_get(1); 741 if (maxfd < 0) 742 fatal("%s: fdlim_get: bad value", __progname); 743 if (maxfd > MAXMAXFD) 744 maxfd = MAXMAXFD; 745 if (MAXCON <= 0) 746 fatal("%s: not enough file descriptors", __progname); 747 if (maxfd > fdlim_get(0)) 748 fdlim_set(maxfd); 749 fdcon = xcalloc(maxfd, sizeof(con)); 750 751 read_wait_nfdset = howmany(maxfd, NFDBITS); 752 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 753 754 for (j = 0; j < fopt_count; j++) { 755 if (argv[j] == NULL) 756 fp = stdin; 757 else if ((fp = fopen(argv[j], "r")) == NULL) 758 fatal("%s: %s: %s", __progname, argv[j], 759 strerror(errno)); 760 761 while (getline(&line, &linesize, fp) != -1) { 762 /* Chomp off trailing whitespace and comments */ 763 if ((cp = strchr(line, '#')) == NULL) 764 cp = line + strlen(line) - 1; 765 while (cp >= line) { 766 if (*cp == ' ' || *cp == '\t' || 767 *cp == '\n' || *cp == '#') 768 *cp-- = '\0'; 769 else 770 break; 771 } 772 773 /* Skip empty lines */ 774 if (*line == '\0') 775 continue; 776 777 do_host(line); 778 } 779 780 if (ferror(fp)) 781 fatal("%s: %s: %s", __progname, argv[j], 782 strerror(errno)); 783 784 fclose(fp); 785 } 786 free(line); 787 788 while (optind < argc) 789 do_host(argv[optind++]); 790 791 while (ncon > 0) 792 conloop(); 793 794 return found_one ? 0 : 1; 795 } 796