1 /* $NetBSD: ssh-keyscan.c,v 1.20 2017/10/07 19:39:19 christos Exp $ */ 2 /* $OpenBSD: ssh-keyscan.c,v 1.115 2017/06/30 04:17:23 dtucker 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 1.20 2017/10/07 19:39:19 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 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_DSA (1) 56 #define KT_RSA (1<<1) 57 #define KT_ECDSA (1<<2) 58 #define KT_ED25519 (1<<3) 59 60 #define KT_MIN KT_DSA 61 #define KT_MAX KT_ED25519 62 63 int get_cert = 0; 64 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519; 65 66 int hash_hosts = 0; /* Hash hostname on output */ 67 68 #define MAXMAXFD 256 69 70 /* The number of seconds after which to give up on a TCP connection */ 71 int timeout = 5; 72 73 int maxfd; 74 #define MAXCON (maxfd - 10) 75 76 extern char *__progname; 77 fd_set *read_wait; 78 size_t read_wait_nfdset; 79 int ncon; 80 81 /* 82 * Keep a connection structure for each file descriptor. The state 83 * associated with file descriptor n is held in fdcon[n]. 84 */ 85 typedef struct Connection { 86 u_char c_status; /* State of connection on this file desc. */ 87 #define CS_UNUSED 0 /* File descriptor unused */ 88 #define CS_CON 1 /* Waiting to connect/read greeting */ 89 #define CS_SIZE 2 /* Waiting to read initial packet size */ 90 #define CS_KEYS 3 /* Waiting to read public key packet */ 91 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 92 int c_plen; /* Packet length field for ssh packet */ 93 int c_len; /* Total bytes which must be read. */ 94 int c_off; /* Length of data read so far. */ 95 int c_keytype; /* Only one of KT_* */ 96 sig_atomic_t c_done; /* SSH2 done */ 97 char *c_namebase; /* Address to free for c_name and c_namelist */ 98 char *c_name; /* Hostname of connection for errors */ 99 char *c_namelist; /* Pointer to other possible addresses */ 100 char *c_output_name; /* Hostname of connection for output */ 101 char *c_data; /* Data read from this fd */ 102 struct ssh *c_ssh; /* SSH-connection */ 103 struct timeval c_tv; /* Time at which connection gets aborted */ 104 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 105 } con; 106 107 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 108 con *fdcon; 109 110 static void keyprint(con *c, struct sshkey *key); 111 112 static int 113 fdlim_get(int hard) 114 { 115 struct rlimit rlfd; 116 117 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 118 return (-1); 119 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 120 return sysconf(_SC_OPEN_MAX); 121 else 122 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 123 } 124 125 static int 126 fdlim_set(int lim) 127 { 128 struct rlimit rlfd; 129 130 if (lim <= 0) 131 return (-1); 132 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 133 return (-1); 134 rlfd.rlim_cur = lim; 135 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) 136 return (-1); 137 return (0); 138 } 139 140 /* 141 * This is an strsep function that returns a null field for adjacent 142 * separators. This is the same as the 4.4BSD strsep, but different from the 143 * one in the GNU libc. 144 */ 145 static char * 146 xstrsep(char **str, const char *delim) 147 { 148 char *s, *e; 149 150 if (!**str) 151 return (NULL); 152 153 s = *str; 154 e = s + strcspn(s, delim); 155 156 if (*e != '\0') 157 *e++ = '\0'; 158 *str = e; 159 160 return (s); 161 } 162 163 /* 164 * Get the next non-null token (like GNU strsep). Strsep() will return a 165 * null token for two adjacent separators, so we may have to loop. 166 */ 167 static char * 168 strnnsep(char **stringp, const char *delim) 169 { 170 char *tok; 171 172 do { 173 tok = xstrsep(stringp, delim); 174 } while (tok && *tok == '\0'); 175 return (tok); 176 } 177 178 179 static int 180 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh) 181 { 182 con *c; 183 184 if ((c = ssh_get_app_data(ssh)) != NULL) 185 keyprint(c, hostkey); 186 /* always abort key exchange */ 187 return -1; 188 } 189 190 static int 191 ssh2_capable(int remote_major, int remote_minor) 192 { 193 switch (remote_major) { 194 case 1: 195 if (remote_minor == 99) 196 return 1; 197 break; 198 case 2: 199 return 1; 200 default: 201 break; 202 } 203 return 0; 204 } 205 206 static void 207 keygrab_ssh2(con *c) 208 { 209 const char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; 210 int r; 211 212 switch (c->c_keytype) { 213 case KT_DSA: 214 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 215 "ssh-dss-cert-v01@openssh.com" : "ssh-dss"; 216 break; 217 case KT_RSA: 218 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 219 "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa"; 220 break; 221 case KT_ED25519: 222 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 223 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519"; 224 break; 225 case KT_ECDSA: 226 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 227 "ecdsa-sha2-nistp256-cert-v01@openssh.com," 228 "ecdsa-sha2-nistp384-cert-v01@openssh.com," 229 "ecdsa-sha2-nistp521-cert-v01@openssh.com" : 230 "ecdsa-sha2-nistp256," 231 "ecdsa-sha2-nistp384," 232 "ecdsa-sha2-nistp521"; 233 break; 234 default: 235 fatal("unknown key type %d", c->c_keytype); 236 break; 237 } 238 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) { 239 free(c->c_ssh); 240 fprintf(stderr, "kex_setup: %s\n", ssh_err(r)); 241 exit(1); 242 } 243 #ifdef WITH_OPENSSL 244 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; 245 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; 246 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client; 247 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client; 248 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client; 249 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 250 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 251 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client; 252 #endif 253 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client; 254 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 255 /* 256 * do the key-exchange until an error occurs or until 257 * the key_print_wrapper() callback sets c_done. 258 */ 259 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done); 260 } 261 262 static void 263 keyprint_one(const char *host, struct sshkey *key) 264 { 265 char *hostport; 266 const char *known_host, *hashed; 267 268 hostport = put_host_port(host, ssh_port); 269 lowercase(hostport); 270 if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL) 271 fatal("host_hash failed"); 272 known_host = hash_hosts ? hashed : hostport; 273 if (!get_cert) 274 fprintf(stdout, "%s ", known_host); 275 sshkey_write(key, stdout); 276 fputs("\n", stdout); 277 free(hostport); 278 } 279 280 static void 281 keyprint(con *c, struct sshkey *key) 282 { 283 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 284 char *host, *ohosts; 285 286 if (key == NULL) 287 return; 288 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 289 keyprint_one(hosts, key); 290 return; 291 } 292 ohosts = hosts = xstrdup(hosts); 293 while ((host = strsep(&hosts, ",")) != NULL) 294 keyprint_one(host, key); 295 free(ohosts); 296 } 297 298 static int 299 tcpconnect(char *host) 300 { 301 struct addrinfo hints, *ai, *aitop; 302 char strport[NI_MAXSERV]; 303 int gaierr, s = -1; 304 305 snprintf(strport, sizeof strport, "%d", ssh_port); 306 memset(&hints, 0, sizeof(hints)); 307 hints.ai_family = IPv4or6; 308 hints.ai_socktype = SOCK_STREAM; 309 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 310 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 311 return -1; 312 } 313 for (ai = aitop; ai; ai = ai->ai_next) { 314 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 315 if (s < 0) { 316 error("socket: %s", strerror(errno)); 317 continue; 318 } 319 if (set_nonblock(s) == -1) 320 fatal("%s: set_nonblock(%d)", __func__, s); 321 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 322 errno != EINPROGRESS) 323 error("connect (`%s'): %s", host, strerror(errno)); 324 else 325 break; 326 close(s); 327 s = -1; 328 } 329 freeaddrinfo(aitop); 330 return s; 331 } 332 333 static int 334 conalloc(char *iname, char *oname, int keytype) 335 { 336 char *namebase, *name, *namelist; 337 int s; 338 339 namebase = namelist = xstrdup(iname); 340 341 do { 342 name = xstrsep(&namelist, ","); 343 if (!name) { 344 free(namebase); 345 return (-1); 346 } 347 } while ((s = tcpconnect(name)) < 0); 348 349 if (s >= maxfd) 350 fatal("conalloc: fdno %d too high", s); 351 if (fdcon[s].c_status) 352 fatal("conalloc: attempt to reuse fdno %d", s); 353 354 debug3("%s: oname %s kt %d", __func__, oname, keytype); 355 fdcon[s].c_fd = s; 356 fdcon[s].c_status = CS_CON; 357 fdcon[s].c_namebase = namebase; 358 fdcon[s].c_name = name; 359 fdcon[s].c_namelist = namelist; 360 fdcon[s].c_output_name = xstrdup(oname); 361 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 362 fdcon[s].c_len = 4; 363 fdcon[s].c_off = 0; 364 fdcon[s].c_keytype = keytype; 365 gettimeofday(&fdcon[s].c_tv, NULL); 366 fdcon[s].c_tv.tv_sec += timeout; 367 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 368 FD_SET(s, read_wait); 369 ncon++; 370 return (s); 371 } 372 373 static void 374 confree(int s) 375 { 376 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 377 fatal("confree: attempt to free bad fdno %d", s); 378 free(fdcon[s].c_namebase); 379 free(fdcon[s].c_output_name); 380 if (fdcon[s].c_status == CS_KEYS) 381 free(fdcon[s].c_data); 382 fdcon[s].c_status = CS_UNUSED; 383 fdcon[s].c_keytype = 0; 384 if (fdcon[s].c_ssh) { 385 ssh_packet_close(fdcon[s].c_ssh); 386 free(fdcon[s].c_ssh); 387 fdcon[s].c_ssh = NULL; 388 } else 389 close(s); 390 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 391 FD_CLR(s, read_wait); 392 ncon--; 393 } 394 395 static void 396 contouch(int s) 397 { 398 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 399 gettimeofday(&fdcon[s].c_tv, NULL); 400 fdcon[s].c_tv.tv_sec += timeout; 401 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 402 } 403 404 static int 405 conrecycle(int s) 406 { 407 con *c = &fdcon[s]; 408 int ret; 409 410 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 411 confree(s); 412 return (ret); 413 } 414 415 static void 416 congreet(int s) 417 { 418 int n = 0, remote_major = 0, remote_minor = 0; 419 char buf[256], *cp; 420 char remote_version[sizeof buf]; 421 size_t bufsiz; 422 con *c = &fdcon[s]; 423 424 /* send client banner */ 425 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 426 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); 427 if (n < 0 || (size_t)n >= sizeof(buf)) { 428 error("snprintf: buffer too small"); 429 confree(s); 430 return; 431 } 432 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 433 error("write (%s): %s", c->c_name, strerror(errno)); 434 confree(s); 435 return; 436 } 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 (!ssh2_capable(remote_major, remote_minor)) { 481 debug("%s doesn't support ssh2", c->c_name); 482 confree(s); 483 return; 484 } 485 fprintf(stderr, "# %s:%d %s\n", c->c_name, ssh_port, chop(buf)); 486 keygrab_ssh2(c); 487 confree(s); 488 } 489 490 static void 491 conread(int s) 492 { 493 con *c = &fdcon[s]; 494 size_t n; 495 496 if (c->c_status == CS_CON) { 497 congreet(s); 498 return; 499 } 500 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 501 if (n == 0) { 502 error("read (%s): %s", c->c_name, strerror(errno)); 503 confree(s); 504 return; 505 } 506 c->c_off += n; 507 508 if (c->c_off == c->c_len) 509 switch (c->c_status) { 510 case CS_SIZE: 511 c->c_plen = htonl(c->c_plen); 512 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 513 c->c_off = 0; 514 c->c_data = xmalloc(c->c_len); 515 c->c_status = CS_KEYS; 516 break; 517 default: 518 fatal("conread: invalid status %d", c->c_status); 519 break; 520 } 521 522 contouch(s); 523 } 524 525 static void 526 conloop(void) 527 { 528 struct timeval seltime, now; 529 fd_set *r, *e; 530 con *c; 531 int i; 532 533 gettimeofday(&now, NULL); 534 c = TAILQ_FIRST(&tq); 535 536 if (c && (c->c_tv.tv_sec > now.tv_sec || 537 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 538 seltime = c->c_tv; 539 seltime.tv_sec -= now.tv_sec; 540 seltime.tv_usec -= now.tv_usec; 541 if (seltime.tv_usec < 0) { 542 seltime.tv_usec += 1000000; 543 seltime.tv_sec--; 544 } 545 } else 546 timerclear(&seltime); 547 548 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 549 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 550 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 551 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 552 553 while (select(maxfd, r, NULL, e, &seltime) == -1 && 554 (errno == EAGAIN || errno == EINTR)) 555 ; 556 557 for (i = 0; i < maxfd; i++) { 558 if (FD_ISSET(i, e)) { 559 error("%s: exception!", fdcon[i].c_name); 560 confree(i); 561 } else if (FD_ISSET(i, r)) 562 conread(i); 563 } 564 free(r); 565 free(e); 566 567 c = TAILQ_FIRST(&tq); 568 while (c && (c->c_tv.tv_sec < now.tv_sec || 569 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 570 int s = c->c_fd; 571 572 c = TAILQ_NEXT(c, c_link); 573 conrecycle(s); 574 } 575 } 576 577 static void 578 do_host(char *host) 579 { 580 char *name = strnnsep(&host, " \t\n"); 581 int j; 582 583 if (name == NULL) 584 return; 585 for (j = KT_MIN; j <= KT_MAX; j *= 2) { 586 if (get_keytypes & j) { 587 while (ncon >= MAXCON) 588 conloop(); 589 conalloc(name, *host ? host : name, j); 590 } 591 } 592 } 593 594 __dead void 595 fatal(const char *fmt,...) 596 { 597 va_list args; 598 599 va_start(args, fmt); 600 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 601 va_end(args); 602 exit(255); 603 } 604 605 __dead static void 606 usage(void) 607 { 608 fprintf(stderr, 609 "usage: %s [-46cHv] [-f file] [-p port] [-T timeout] [-t type]\n" 610 "\t\t [host | addrlist namelist] ...\n", 611 __progname); 612 exit(1); 613 } 614 615 int 616 main(int argc, char **argv) 617 { 618 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 619 int opt, fopt_count = 0, j; 620 char *tname, *cp, line[NI_MAXHOST]; 621 FILE *fp; 622 u_long linenum; 623 624 extern int optind; 625 extern char *optarg; 626 627 ssh_malloc_init(); /* must be called before any mallocs */ 628 TAILQ_INIT(&tq); 629 630 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 631 sanitise_stdfd(); 632 633 if (argc <= 1) 634 usage(); 635 636 while ((opt = getopt(argc, argv, "cHv46p:T:t:f:")) != -1) { 637 switch (opt) { 638 case 'H': 639 hash_hosts = 1; 640 break; 641 case 'c': 642 get_cert = 1; 643 break; 644 case 'p': 645 ssh_port = a2port(optarg); 646 if (ssh_port <= 0) { 647 fprintf(stderr, "Bad port '%s'\n", optarg); 648 exit(1); 649 } 650 break; 651 case 'T': 652 timeout = convtime(optarg); 653 if (timeout == -1 || timeout == 0) { 654 fprintf(stderr, "Bad timeout '%s'\n", optarg); 655 usage(); 656 } 657 break; 658 case 'v': 659 if (!debug_flag) { 660 debug_flag = 1; 661 log_level = SYSLOG_LEVEL_DEBUG1; 662 } 663 else if (log_level < SYSLOG_LEVEL_DEBUG3) 664 log_level++; 665 else 666 fatal("Too high debugging level."); 667 break; 668 case 'f': 669 if (strcmp(optarg, "-") == 0) 670 optarg = NULL; 671 argv[fopt_count++] = optarg; 672 break; 673 case 't': 674 get_keytypes = 0; 675 tname = strtok(optarg, ","); 676 while (tname) { 677 int type = sshkey_type_from_name(tname); 678 679 switch (type) { 680 case KEY_DSA: 681 get_keytypes |= KT_DSA; 682 break; 683 case KEY_ECDSA: 684 get_keytypes |= KT_ECDSA; 685 break; 686 case KEY_RSA: 687 get_keytypes |= KT_RSA; 688 break; 689 case KEY_ED25519: 690 get_keytypes |= KT_ED25519; 691 break; 692 case KEY_UNSPEC: 693 default: 694 fatal("Unknown key type \"%s\"", tname); 695 } 696 tname = strtok(NULL, ","); 697 } 698 break; 699 case '4': 700 IPv4or6 = AF_INET; 701 break; 702 case '6': 703 IPv4or6 = AF_INET6; 704 break; 705 case '?': 706 default: 707 usage(); 708 } 709 } 710 if (optind == argc && !fopt_count) 711 usage(); 712 713 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 714 715 maxfd = fdlim_get(1); 716 if (maxfd < 0) 717 fatal("%s: fdlim_get: bad value", __progname); 718 if (maxfd > MAXMAXFD) 719 maxfd = MAXMAXFD; 720 if (MAXCON <= 0) 721 fatal("%s: not enough file descriptors", __progname); 722 if (maxfd > fdlim_get(0)) 723 fdlim_set(maxfd); 724 fdcon = xcalloc(maxfd, sizeof(con)); 725 726 read_wait_nfdset = howmany(maxfd, NFDBITS); 727 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 728 729 for (j = 0; j < fopt_count; j++) { 730 if (argv[j] == NULL) 731 fp = stdin; 732 else if ((fp = fopen(argv[j], "r")) == NULL) 733 fatal("%s: %s: %s", __progname, argv[j], 734 strerror(errno)); 735 linenum = 0; 736 737 while (read_keyfile_line(fp, 738 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line), 739 &linenum) != -1) { 740 /* Chomp off trailing whitespace and comments */ 741 if ((cp = strchr(line, '#')) == NULL) 742 cp = line + strlen(line) - 1; 743 while (cp >= line) { 744 if (*cp == ' ' || *cp == '\t' || 745 *cp == '\n' || *cp == '#') 746 *cp-- = '\0'; 747 else 748 break; 749 } 750 751 /* Skip empty lines */ 752 if (*line == '\0') 753 continue; 754 755 do_host(line); 756 } 757 758 if (ferror(fp)) 759 fatal("%s: %s: %s", __progname, argv[j], 760 strerror(errno)); 761 762 fclose(fp); 763 } 764 765 while (optind < argc) 766 do_host(argv[optind++]); 767 768 while (ncon > 0) 769 conloop(); 770 771 return (0); 772 } 773