1 /* $NetBSD: ssh-keyscan.c,v 1.21 2018/04/06 18:59:00 christos Exp $ */ 2 /* $OpenBSD: ssh-keyscan.c,v 1.119 2018/03/02 21:40:15 jmc 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 1.21 2018/04/06 18:59:00 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 #define MAXMAXFD 256 73 74 /* The number of seconds after which to give up on a TCP connection */ 75 int timeout = 5; 76 77 int maxfd; 78 #define MAXCON (maxfd - 10) 79 80 extern char *__progname; 81 fd_set *read_wait; 82 size_t read_wait_nfdset; 83 int ncon; 84 85 /* 86 * Keep a connection structure for each file descriptor. The state 87 * associated with file descriptor n is held in fdcon[n]. 88 */ 89 typedef struct Connection { 90 u_char c_status; /* State of connection on this file desc. */ 91 #define CS_UNUSED 0 /* File descriptor unused */ 92 #define CS_CON 1 /* Waiting to connect/read greeting */ 93 #define CS_SIZE 2 /* Waiting to read initial packet size */ 94 #define CS_KEYS 3 /* Waiting to read public key packet */ 95 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 96 int c_plen; /* Packet length field for ssh packet */ 97 int c_len; /* Total bytes which must be read. */ 98 int c_off; /* Length of data read so far. */ 99 int c_keytype; /* Only one of KT_* */ 100 sig_atomic_t c_done; /* SSH2 done */ 101 char *c_namebase; /* Address to free for c_name and c_namelist */ 102 char *c_name; /* Hostname of connection for errors */ 103 char *c_namelist; /* Pointer to other possible addresses */ 104 char *c_output_name; /* Hostname of connection for output */ 105 char *c_data; /* Data read from this fd */ 106 struct ssh *c_ssh; /* SSH-connection */ 107 struct timeval c_tv; /* Time at which connection gets aborted */ 108 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 109 } con; 110 111 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 112 con *fdcon; 113 114 static void keyprint(con *c, struct sshkey *key); 115 116 static int 117 fdlim_get(int hard) 118 { 119 struct rlimit rlfd; 120 121 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 122 return (-1); 123 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 124 return sysconf(_SC_OPEN_MAX); 125 else 126 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 127 } 128 129 static int 130 fdlim_set(int lim) 131 { 132 struct rlimit rlfd; 133 134 if (lim <= 0) 135 return (-1); 136 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 137 return (-1); 138 rlfd.rlim_cur = lim; 139 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) 140 return (-1); 141 return (0); 142 } 143 144 /* 145 * This is an strsep function that returns a null field for adjacent 146 * separators. This is the same as the 4.4BSD strsep, but different from the 147 * one in the GNU libc. 148 */ 149 static char * 150 xstrsep(char **str, const char *delim) 151 { 152 char *s, *e; 153 154 if (!**str) 155 return (NULL); 156 157 s = *str; 158 e = s + strcspn(s, delim); 159 160 if (*e != '\0') 161 *e++ = '\0'; 162 *str = e; 163 164 return (s); 165 } 166 167 /* 168 * Get the next non-null token (like GNU strsep). Strsep() will return a 169 * null token for two adjacent separators, so we may have to loop. 170 */ 171 static char * 172 strnnsep(char **stringp, const char *delim) 173 { 174 char *tok; 175 176 do { 177 tok = xstrsep(stringp, delim); 178 } while (tok && *tok == '\0'); 179 return (tok); 180 } 181 182 183 static int 184 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh) 185 { 186 con *c; 187 188 if ((c = ssh_get_app_data(ssh)) != NULL) 189 keyprint(c, hostkey); 190 /* always abort key exchange */ 191 return -1; 192 } 193 194 static int 195 ssh2_capable(int remote_major, int remote_minor) 196 { 197 switch (remote_major) { 198 case 1: 199 if (remote_minor == 99) 200 return 1; 201 break; 202 case 2: 203 return 1; 204 default: 205 break; 206 } 207 return 0; 208 } 209 210 static void 211 keygrab_ssh2(con *c) 212 { 213 const char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; 214 int r; 215 216 switch (c->c_keytype) { 217 case KT_DSA: 218 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 219 "ssh-dss-cert-v01@openssh.com" : "ssh-dss"; 220 break; 221 case KT_RSA: 222 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 223 "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa"; 224 break; 225 case KT_ED25519: 226 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 227 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519"; 228 break; 229 case KT_XMSS: 230 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 231 "ssh-xmss-cert-v01@openssh.com" : "ssh-xmss@openssh.com"; 232 break; 233 case KT_ECDSA: 234 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 235 "ecdsa-sha2-nistp256-cert-v01@openssh.com," 236 "ecdsa-sha2-nistp384-cert-v01@openssh.com," 237 "ecdsa-sha2-nistp521-cert-v01@openssh.com" : 238 "ecdsa-sha2-nistp256," 239 "ecdsa-sha2-nistp384," 240 "ecdsa-sha2-nistp521"; 241 break; 242 default: 243 fatal("unknown key type %d", c->c_keytype); 244 break; 245 } 246 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) { 247 free(c->c_ssh); 248 fprintf(stderr, "kex_setup: %s\n", ssh_err(r)); 249 exit(1); 250 } 251 #ifdef WITH_OPENSSL 252 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; 253 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; 254 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client; 255 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client; 256 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client; 257 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 258 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 259 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client; 260 #endif 261 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client; 262 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 263 /* 264 * do the key-exchange until an error occurs or until 265 * the key_print_wrapper() callback sets c_done. 266 */ 267 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done); 268 } 269 270 static void 271 keyprint_one(const char *host, struct sshkey *key) 272 { 273 char *hostport; 274 const char *known_host, *hashed; 275 276 if (print_sshfp) { 277 export_dns_rr(host, key, stdout, 0); 278 return; 279 } 280 281 hostport = put_host_port(host, ssh_port); 282 lowercase(hostport); 283 if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL) 284 fatal("host_hash failed"); 285 known_host = hash_hosts ? hashed : hostport; 286 if (!get_cert) 287 fprintf(stdout, "%s ", known_host); 288 sshkey_write(key, stdout); 289 fputs("\n", stdout); 290 free(hostport); 291 } 292 293 static void 294 keyprint(con *c, struct sshkey *key) 295 { 296 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 297 char *host, *ohosts; 298 299 if (key == NULL) 300 return; 301 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 302 keyprint_one(hosts, key); 303 return; 304 } 305 ohosts = hosts = xstrdup(hosts); 306 while ((host = strsep(&hosts, ",")) != NULL) 307 keyprint_one(host, key); 308 free(ohosts); 309 } 310 311 static int 312 tcpconnect(char *host) 313 { 314 struct addrinfo hints, *ai, *aitop; 315 char strport[NI_MAXSERV]; 316 int gaierr, s = -1; 317 318 snprintf(strport, sizeof strport, "%d", ssh_port); 319 memset(&hints, 0, sizeof(hints)); 320 hints.ai_family = IPv4or6; 321 hints.ai_socktype = SOCK_STREAM; 322 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 323 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 324 return -1; 325 } 326 for (ai = aitop; ai; ai = ai->ai_next) { 327 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 328 if (s < 0) { 329 error("socket: %s", strerror(errno)); 330 continue; 331 } 332 if (set_nonblock(s) == -1) 333 fatal("%s: set_nonblock(%d)", __func__, s); 334 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 335 errno != EINPROGRESS) 336 error("connect (`%s'): %s", host, strerror(errno)); 337 else 338 break; 339 close(s); 340 s = -1; 341 } 342 freeaddrinfo(aitop); 343 return s; 344 } 345 346 static int 347 conalloc(char *iname, char *oname, int keytype) 348 { 349 char *namebase, *name, *namelist; 350 int s; 351 352 namebase = namelist = xstrdup(iname); 353 354 do { 355 name = xstrsep(&namelist, ","); 356 if (!name) { 357 free(namebase); 358 return (-1); 359 } 360 } while ((s = tcpconnect(name)) < 0); 361 362 if (s >= maxfd) 363 fatal("conalloc: fdno %d too high", s); 364 if (fdcon[s].c_status) 365 fatal("conalloc: attempt to reuse fdno %d", s); 366 367 debug3("%s: oname %s kt %d", __func__, oname, keytype); 368 fdcon[s].c_fd = s; 369 fdcon[s].c_status = CS_CON; 370 fdcon[s].c_namebase = namebase; 371 fdcon[s].c_name = name; 372 fdcon[s].c_namelist = namelist; 373 fdcon[s].c_output_name = xstrdup(oname); 374 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 375 fdcon[s].c_len = 4; 376 fdcon[s].c_off = 0; 377 fdcon[s].c_keytype = keytype; 378 monotime_tv(&fdcon[s].c_tv); 379 fdcon[s].c_tv.tv_sec += timeout; 380 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 381 FD_SET(s, read_wait); 382 ncon++; 383 return (s); 384 } 385 386 static void 387 confree(int s) 388 { 389 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 390 fatal("confree: attempt to free bad fdno %d", s); 391 free(fdcon[s].c_namebase); 392 free(fdcon[s].c_output_name); 393 if (fdcon[s].c_status == CS_KEYS) 394 free(fdcon[s].c_data); 395 fdcon[s].c_status = CS_UNUSED; 396 fdcon[s].c_keytype = 0; 397 if (fdcon[s].c_ssh) { 398 ssh_packet_close(fdcon[s].c_ssh); 399 free(fdcon[s].c_ssh); 400 fdcon[s].c_ssh = NULL; 401 } else 402 close(s); 403 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 404 FD_CLR(s, read_wait); 405 ncon--; 406 } 407 408 static void 409 contouch(int s) 410 { 411 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 412 monotime_tv(&fdcon[s].c_tv); 413 fdcon[s].c_tv.tv_sec += timeout; 414 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 415 } 416 417 static int 418 conrecycle(int s) 419 { 420 con *c = &fdcon[s]; 421 int ret; 422 423 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 424 confree(s); 425 return (ret); 426 } 427 428 static void 429 congreet(int s) 430 { 431 int n = 0, remote_major = 0, remote_minor = 0; 432 char buf[256], *cp; 433 char remote_version[sizeof buf]; 434 size_t bufsiz; 435 con *c = &fdcon[s]; 436 437 /* send client banner */ 438 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 439 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); 440 if (n < 0 || (size_t)n >= sizeof(buf)) { 441 error("snprintf: buffer too small"); 442 confree(s); 443 return; 444 } 445 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 446 error("write (%s): %s", c->c_name, strerror(errno)); 447 confree(s); 448 return; 449 } 450 451 for (;;) { 452 memset(buf, '\0', sizeof(buf)); 453 bufsiz = sizeof(buf); 454 cp = buf; 455 while (bufsiz-- && 456 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 457 if (*cp == '\r') 458 *cp = '\n'; 459 cp++; 460 } 461 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 462 break; 463 } 464 if (n == 0) { 465 switch (errno) { 466 case EPIPE: 467 error("%s: Connection closed by remote host", c->c_name); 468 break; 469 case ECONNREFUSED: 470 break; 471 default: 472 error("read (%s): %s", c->c_name, strerror(errno)); 473 break; 474 } 475 conrecycle(s); 476 return; 477 } 478 if (*cp != '\n' && *cp != '\r') { 479 error("%s: bad greeting", c->c_name); 480 confree(s); 481 return; 482 } 483 *cp = '\0'; 484 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 485 fatal("ssh_packet_set_connection failed"); 486 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 487 ssh_set_app_data(c->c_ssh, c); /* back link */ 488 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 489 &remote_major, &remote_minor, remote_version) == 3) 490 c->c_ssh->compat = compat_datafellows(remote_version); 491 else 492 c->c_ssh->compat = 0; 493 if (!ssh2_capable(remote_major, remote_minor)) { 494 debug("%s doesn't support ssh2", c->c_name); 495 confree(s); 496 return; 497 } 498 fprintf(stderr, "%c %s:%d %s\n", print_sshfp ? ';' : '#', 499 c->c_name, ssh_port, chop(buf)); 500 keygrab_ssh2(c); 501 confree(s); 502 } 503 504 static void 505 conread(int s) 506 { 507 con *c = &fdcon[s]; 508 size_t n; 509 510 if (c->c_status == CS_CON) { 511 congreet(s); 512 return; 513 } 514 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 515 if (n == 0) { 516 error("read (%s): %s", c->c_name, strerror(errno)); 517 confree(s); 518 return; 519 } 520 c->c_off += n; 521 522 if (c->c_off == c->c_len) 523 switch (c->c_status) { 524 case CS_SIZE: 525 c->c_plen = htonl(c->c_plen); 526 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 527 c->c_off = 0; 528 c->c_data = xmalloc(c->c_len); 529 c->c_status = CS_KEYS; 530 break; 531 default: 532 fatal("conread: invalid status %d", c->c_status); 533 break; 534 } 535 536 contouch(s); 537 } 538 539 static void 540 conloop(void) 541 { 542 struct timeval seltime, now; 543 fd_set *r, *e; 544 con *c; 545 int i; 546 547 monotime_tv(&now); 548 c = TAILQ_FIRST(&tq); 549 550 if (c && (c->c_tv.tv_sec > now.tv_sec || 551 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 552 seltime = c->c_tv; 553 seltime.tv_sec -= now.tv_sec; 554 seltime.tv_usec -= now.tv_usec; 555 if (seltime.tv_usec < 0) { 556 seltime.tv_usec += 1000000; 557 seltime.tv_sec--; 558 } 559 } else 560 timerclear(&seltime); 561 562 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 563 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 564 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 565 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 566 567 while (select(maxfd, r, NULL, e, &seltime) == -1 && 568 (errno == EAGAIN || errno == EINTR)) 569 ; 570 571 for (i = 0; i < maxfd; i++) { 572 if (FD_ISSET(i, e)) { 573 error("%s: exception!", fdcon[i].c_name); 574 confree(i); 575 } else if (FD_ISSET(i, r)) 576 conread(i); 577 } 578 free(r); 579 free(e); 580 581 c = TAILQ_FIRST(&tq); 582 while (c && (c->c_tv.tv_sec < now.tv_sec || 583 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 584 int s = c->c_fd; 585 586 c = TAILQ_NEXT(c, c_link); 587 conrecycle(s); 588 } 589 } 590 591 static void 592 do_host(char *host) 593 { 594 char *name = strnnsep(&host, " \t\n"); 595 int j; 596 597 if (name == NULL) 598 return; 599 for (j = KT_MIN; j <= KT_MAX; j *= 2) { 600 if (get_keytypes & j) { 601 while (ncon >= MAXCON) 602 conloop(); 603 conalloc(name, *host ? host : name, j); 604 } 605 } 606 } 607 608 __dead void 609 fatal(const char *fmt,...) 610 { 611 va_list args; 612 613 va_start(args, fmt); 614 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 615 va_end(args); 616 exit(255); 617 } 618 619 __dead static void 620 usage(void) 621 { 622 fprintf(stderr, 623 "usage: %s [-46cDHv] [-f file] [-p port] [-T timeout] [-t type]\n" 624 "\t\t [host | addrlist namelist]\n", 625 __progname); 626 exit(1); 627 } 628 629 int 630 main(int argc, char **argv) 631 { 632 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 633 int opt, fopt_count = 0, j; 634 char *tname, *cp, line[NI_MAXHOST]; 635 FILE *fp; 636 u_long linenum; 637 638 extern int optind; 639 extern char *optarg; 640 641 ssh_malloc_init(); /* must be called before any mallocs */ 642 TAILQ_INIT(&tq); 643 644 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 645 sanitise_stdfd(); 646 647 if (argc <= 1) 648 usage(); 649 650 while ((opt = getopt(argc, argv, "cDHv46p:T:t:f:")) != -1) { 651 switch (opt) { 652 case 'H': 653 hash_hosts = 1; 654 break; 655 case 'c': 656 get_cert = 1; 657 break; 658 case 'D': 659 print_sshfp = 1; 660 break; 661 case 'p': 662 ssh_port = a2port(optarg); 663 if (ssh_port <= 0) { 664 fprintf(stderr, "Bad port '%s'\n", optarg); 665 exit(1); 666 } 667 break; 668 case 'T': 669 timeout = convtime(optarg); 670 if (timeout == -1 || timeout == 0) { 671 fprintf(stderr, "Bad timeout '%s'\n", optarg); 672 usage(); 673 } 674 break; 675 case 'v': 676 if (!debug_flag) { 677 debug_flag = 1; 678 log_level = SYSLOG_LEVEL_DEBUG1; 679 } 680 else if (log_level < SYSLOG_LEVEL_DEBUG3) 681 log_level++; 682 else 683 fatal("Too high debugging level."); 684 break; 685 case 'f': 686 if (strcmp(optarg, "-") == 0) 687 optarg = NULL; 688 argv[fopt_count++] = optarg; 689 break; 690 case 't': 691 get_keytypes = 0; 692 tname = strtok(optarg, ","); 693 while (tname) { 694 int type = sshkey_type_from_name(tname); 695 696 switch (type) { 697 case KEY_DSA: 698 get_keytypes |= KT_DSA; 699 break; 700 case KEY_ECDSA: 701 get_keytypes |= KT_ECDSA; 702 break; 703 case KEY_RSA: 704 get_keytypes |= KT_RSA; 705 break; 706 case KEY_ED25519: 707 get_keytypes |= KT_ED25519; 708 break; 709 case KEY_XMSS: 710 get_keytypes |= KT_XMSS; 711 break; 712 case KEY_UNSPEC: 713 default: 714 fatal("Unknown key type \"%s\"", tname); 715 } 716 tname = strtok(NULL, ","); 717 } 718 break; 719 case '4': 720 IPv4or6 = AF_INET; 721 break; 722 case '6': 723 IPv4or6 = AF_INET6; 724 break; 725 case '?': 726 default: 727 usage(); 728 } 729 } 730 if (optind == argc && !fopt_count) 731 usage(); 732 733 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 734 735 maxfd = fdlim_get(1); 736 if (maxfd < 0) 737 fatal("%s: fdlim_get: bad value", __progname); 738 if (maxfd > MAXMAXFD) 739 maxfd = MAXMAXFD; 740 if (MAXCON <= 0) 741 fatal("%s: not enough file descriptors", __progname); 742 if (maxfd > fdlim_get(0)) 743 fdlim_set(maxfd); 744 fdcon = xcalloc(maxfd, sizeof(con)); 745 746 read_wait_nfdset = howmany(maxfd, NFDBITS); 747 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 748 749 for (j = 0; j < fopt_count; j++) { 750 if (argv[j] == NULL) 751 fp = stdin; 752 else if ((fp = fopen(argv[j], "r")) == NULL) 753 fatal("%s: %s: %s", __progname, argv[j], 754 strerror(errno)); 755 linenum = 0; 756 757 while (read_keyfile_line(fp, 758 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line), 759 &linenum) != -1) { 760 /* Chomp off trailing whitespace and comments */ 761 if ((cp = strchr(line, '#')) == NULL) 762 cp = line + strlen(line) - 1; 763 while (cp >= line) { 764 if (*cp == ' ' || *cp == '\t' || 765 *cp == '\n' || *cp == '#') 766 *cp-- = '\0'; 767 else 768 break; 769 } 770 771 /* Skip empty lines */ 772 if (*line == '\0') 773 continue; 774 775 do_host(line); 776 } 777 778 if (ferror(fp)) 779 fatal("%s: %s: %s", __progname, argv[j], 780 strerror(errno)); 781 782 fclose(fp); 783 } 784 785 while (optind < argc) 786 do_host(argv[optind++]); 787 788 while (ncon > 0) 789 conloop(); 790 791 return (0); 792 } 793