1 /* $OpenBSD: ssh-keyscan.c,v 1.116 2017/11/25 06:46:22 dtucker Exp $ */ 2 /* 3 * Copyright 1995, 1996 by David Mazieres <dm@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 <sys/types.h> 11 #include <sys/socket.h> 12 #include <sys/queue.h> 13 #include <sys/time.h> 14 #include <sys/resource.h> 15 16 #include <openssl/bn.h> 17 18 #include <errno.h> 19 #include <netdb.h> 20 #include <stdarg.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <signal.h> 24 #include <string.h> 25 #include <unistd.h> 26 27 #include "xmalloc.h" 28 #include "ssh.h" 29 #include "sshbuf.h" 30 #include "sshkey.h" 31 #include "cipher.h" 32 #include "kex.h" 33 #include "compat.h" 34 #include "myproposal.h" 35 #include "packet.h" 36 #include "dispatch.h" 37 #include "log.h" 38 #include "atomicio.h" 39 #include "misc.h" 40 #include "hostfile.h" 41 #include "ssherr.h" 42 #include "ssh_api.h" 43 44 /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. 45 Default value is AF_UNSPEC means both IPv4 and IPv6. */ 46 int IPv4or6 = AF_UNSPEC; 47 48 int ssh_port = SSH_DEFAULT_PORT; 49 50 #define KT_DSA (1) 51 #define KT_RSA (1<<1) 52 #define KT_ECDSA (1<<2) 53 #define KT_ED25519 (1<<3) 54 55 #define KT_MIN KT_DSA 56 #define KT_MAX KT_ED25519 57 58 int get_cert = 0; 59 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519; 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 76 /* 77 * Keep a connection structure for each file descriptor. The state 78 * associated with file descriptor n is held in fdcon[n]. 79 */ 80 typedef struct Connection { 81 u_char c_status; /* State of connection on this file desc. */ 82 #define CS_UNUSED 0 /* File descriptor unused */ 83 #define CS_CON 1 /* Waiting to connect/read greeting */ 84 #define CS_SIZE 2 /* Waiting to read initial packet size */ 85 #define CS_KEYS 3 /* Waiting to read public key packet */ 86 int c_fd; /* Quick lookup: c->c_fd == c - fdcon */ 87 int c_plen; /* Packet length field for ssh packet */ 88 int c_len; /* Total bytes which must be read. */ 89 int c_off; /* Length of data read so far. */ 90 int c_keytype; /* Only one of KT_* */ 91 sig_atomic_t c_done; /* SSH2 done */ 92 char *c_namebase; /* Address to free for c_name and c_namelist */ 93 char *c_name; /* Hostname of connection for errors */ 94 char *c_namelist; /* Pointer to other possible addresses */ 95 char *c_output_name; /* Hostname of connection for output */ 96 char *c_data; /* Data read from this fd */ 97 struct ssh *c_ssh; /* SSH-connection */ 98 struct timeval c_tv; /* Time at which connection gets aborted */ 99 TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */ 100 } con; 101 102 TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */ 103 con *fdcon; 104 105 static void keyprint(con *c, struct sshkey *key); 106 107 static int 108 fdlim_get(int hard) 109 { 110 struct rlimit rlfd; 111 112 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 113 return (-1); 114 if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY) 115 return sysconf(_SC_OPEN_MAX); 116 else 117 return hard ? rlfd.rlim_max : rlfd.rlim_cur; 118 } 119 120 static int 121 fdlim_set(int lim) 122 { 123 struct rlimit rlfd; 124 125 if (lim <= 0) 126 return (-1); 127 if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0) 128 return (-1); 129 rlfd.rlim_cur = lim; 130 if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0) 131 return (-1); 132 return (0); 133 } 134 135 /* 136 * This is an strsep function that returns a null field for adjacent 137 * separators. This is the same as the 4.4BSD strsep, but different from the 138 * one in the GNU libc. 139 */ 140 static char * 141 xstrsep(char **str, const char *delim) 142 { 143 char *s, *e; 144 145 if (!**str) 146 return (NULL); 147 148 s = *str; 149 e = s + strcspn(s, delim); 150 151 if (*e != '\0') 152 *e++ = '\0'; 153 *str = e; 154 155 return (s); 156 } 157 158 /* 159 * Get the next non-null token (like GNU strsep). Strsep() will return a 160 * null token for two adjacent separators, so we may have to loop. 161 */ 162 static char * 163 strnnsep(char **stringp, char *delim) 164 { 165 char *tok; 166 167 do { 168 tok = xstrsep(stringp, delim); 169 } while (tok && *tok == '\0'); 170 return (tok); 171 } 172 173 174 static int 175 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh) 176 { 177 con *c; 178 179 if ((c = ssh_get_app_data(ssh)) != NULL) 180 keyprint(c, hostkey); 181 /* always abort key exchange */ 182 return -1; 183 } 184 185 static int 186 ssh2_capable(int remote_major, int remote_minor) 187 { 188 switch (remote_major) { 189 case 1: 190 if (remote_minor == 99) 191 return 1; 192 break; 193 case 2: 194 return 1; 195 default: 196 break; 197 } 198 return 0; 199 } 200 201 static void 202 keygrab_ssh2(con *c) 203 { 204 char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; 205 int r; 206 207 switch (c->c_keytype) { 208 case KT_DSA: 209 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 210 "ssh-dss-cert-v01@openssh.com" : "ssh-dss"; 211 break; 212 case KT_RSA: 213 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 214 "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa"; 215 break; 216 case KT_ED25519: 217 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 218 "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519"; 219 break; 220 case KT_ECDSA: 221 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ? 222 "ecdsa-sha2-nistp256-cert-v01@openssh.com," 223 "ecdsa-sha2-nistp384-cert-v01@openssh.com," 224 "ecdsa-sha2-nistp521-cert-v01@openssh.com" : 225 "ecdsa-sha2-nistp256," 226 "ecdsa-sha2-nistp384," 227 "ecdsa-sha2-nistp521"; 228 break; 229 default: 230 fatal("unknown key type %d", c->c_keytype); 231 break; 232 } 233 if ((r = kex_setup(c->c_ssh, myproposal)) != 0) { 234 free(c->c_ssh); 235 fprintf(stderr, "kex_setup: %s\n", ssh_err(r)); 236 exit(1); 237 } 238 #ifdef WITH_OPENSSL 239 c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client; 240 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client; 241 c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client; 242 c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client; 243 c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client; 244 c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; 245 c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; 246 c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client; 247 #endif 248 c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client; 249 ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper); 250 /* 251 * do the key-exchange until an error occurs or until 252 * the key_print_wrapper() callback sets c_done. 253 */ 254 ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done); 255 } 256 257 static void 258 keyprint_one(const char *host, struct sshkey *key) 259 { 260 char *hostport; 261 const char *known_host, *hashed; 262 263 hostport = put_host_port(host, ssh_port); 264 lowercase(hostport); 265 if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL) 266 fatal("host_hash failed"); 267 known_host = hash_hosts ? hashed : hostport; 268 if (!get_cert) 269 fprintf(stdout, "%s ", known_host); 270 sshkey_write(key, stdout); 271 fputs("\n", stdout); 272 free(hostport); 273 } 274 275 static void 276 keyprint(con *c, struct sshkey *key) 277 { 278 char *hosts = c->c_output_name ? c->c_output_name : c->c_name; 279 char *host, *ohosts; 280 281 if (key == NULL) 282 return; 283 if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) { 284 keyprint_one(hosts, key); 285 return; 286 } 287 ohosts = hosts = xstrdup(hosts); 288 while ((host = strsep(&hosts, ",")) != NULL) 289 keyprint_one(host, key); 290 free(ohosts); 291 } 292 293 static int 294 tcpconnect(char *host) 295 { 296 struct addrinfo hints, *ai, *aitop; 297 char strport[NI_MAXSERV]; 298 int gaierr, s = -1; 299 300 snprintf(strport, sizeof strport, "%d", ssh_port); 301 memset(&hints, 0, sizeof(hints)); 302 hints.ai_family = IPv4or6; 303 hints.ai_socktype = SOCK_STREAM; 304 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { 305 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr)); 306 return -1; 307 } 308 for (ai = aitop; ai; ai = ai->ai_next) { 309 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 310 if (s < 0) { 311 error("socket: %s", strerror(errno)); 312 continue; 313 } 314 if (set_nonblock(s) == -1) 315 fatal("%s: set_nonblock(%d)", __func__, s); 316 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 && 317 errno != EINPROGRESS) 318 error("connect (`%s'): %s", host, strerror(errno)); 319 else 320 break; 321 close(s); 322 s = -1; 323 } 324 freeaddrinfo(aitop); 325 return s; 326 } 327 328 static int 329 conalloc(char *iname, char *oname, int keytype) 330 { 331 char *namebase, *name, *namelist; 332 int s; 333 334 namebase = namelist = xstrdup(iname); 335 336 do { 337 name = xstrsep(&namelist, ","); 338 if (!name) { 339 free(namebase); 340 return (-1); 341 } 342 } while ((s = tcpconnect(name)) < 0); 343 344 if (s >= maxfd) 345 fatal("conalloc: fdno %d too high", s); 346 if (fdcon[s].c_status) 347 fatal("conalloc: attempt to reuse fdno %d", s); 348 349 debug3("%s: oname %s kt %d", __func__, oname, keytype); 350 fdcon[s].c_fd = s; 351 fdcon[s].c_status = CS_CON; 352 fdcon[s].c_namebase = namebase; 353 fdcon[s].c_name = name; 354 fdcon[s].c_namelist = namelist; 355 fdcon[s].c_output_name = xstrdup(oname); 356 fdcon[s].c_data = (char *) &fdcon[s].c_plen; 357 fdcon[s].c_len = 4; 358 fdcon[s].c_off = 0; 359 fdcon[s].c_keytype = keytype; 360 monotime_tv(&fdcon[s].c_tv); 361 fdcon[s].c_tv.tv_sec += timeout; 362 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 363 FD_SET(s, read_wait); 364 ncon++; 365 return (s); 366 } 367 368 static void 369 confree(int s) 370 { 371 if (s >= maxfd || fdcon[s].c_status == CS_UNUSED) 372 fatal("confree: attempt to free bad fdno %d", s); 373 free(fdcon[s].c_namebase); 374 free(fdcon[s].c_output_name); 375 if (fdcon[s].c_status == CS_KEYS) 376 free(fdcon[s].c_data); 377 fdcon[s].c_status = CS_UNUSED; 378 fdcon[s].c_keytype = 0; 379 if (fdcon[s].c_ssh) { 380 ssh_packet_close(fdcon[s].c_ssh); 381 free(fdcon[s].c_ssh); 382 fdcon[s].c_ssh = NULL; 383 } else 384 close(s); 385 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 386 FD_CLR(s, read_wait); 387 ncon--; 388 } 389 390 static void 391 contouch(int s) 392 { 393 TAILQ_REMOVE(&tq, &fdcon[s], c_link); 394 monotime_tv(&fdcon[s].c_tv); 395 fdcon[s].c_tv.tv_sec += timeout; 396 TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link); 397 } 398 399 static int 400 conrecycle(int s) 401 { 402 con *c = &fdcon[s]; 403 int ret; 404 405 ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype); 406 confree(s); 407 return (ret); 408 } 409 410 static void 411 congreet(int s) 412 { 413 int n = 0, remote_major = 0, remote_minor = 0; 414 char buf[256], *cp; 415 char remote_version[sizeof buf]; 416 size_t bufsiz; 417 con *c = &fdcon[s]; 418 419 /* send client banner */ 420 n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n", 421 PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); 422 if (n < 0 || (size_t)n >= sizeof(buf)) { 423 error("snprintf: buffer too small"); 424 confree(s); 425 return; 426 } 427 if (atomicio(vwrite, s, buf, n) != (size_t)n) { 428 error("write (%s): %s", c->c_name, strerror(errno)); 429 confree(s); 430 return; 431 } 432 433 for (;;) { 434 memset(buf, '\0', sizeof(buf)); 435 bufsiz = sizeof(buf); 436 cp = buf; 437 while (bufsiz-- && 438 (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') { 439 if (*cp == '\r') 440 *cp = '\n'; 441 cp++; 442 } 443 if (n != 1 || strncmp(buf, "SSH-", 4) == 0) 444 break; 445 } 446 if (n == 0) { 447 switch (errno) { 448 case EPIPE: 449 error("%s: Connection closed by remote host", c->c_name); 450 break; 451 case ECONNREFUSED: 452 break; 453 default: 454 error("read (%s): %s", c->c_name, strerror(errno)); 455 break; 456 } 457 conrecycle(s); 458 return; 459 } 460 if (*cp != '\n' && *cp != '\r') { 461 error("%s: bad greeting", c->c_name); 462 confree(s); 463 return; 464 } 465 *cp = '\0'; 466 if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL) 467 fatal("ssh_packet_set_connection failed"); 468 ssh_packet_set_timeout(c->c_ssh, timeout, 1); 469 ssh_set_app_data(c->c_ssh, c); /* back link */ 470 if (sscanf(buf, "SSH-%d.%d-%[^\n]\n", 471 &remote_major, &remote_minor, remote_version) == 3) 472 c->c_ssh->compat = compat_datafellows(remote_version); 473 else 474 c->c_ssh->compat = 0; 475 if (!ssh2_capable(remote_major, remote_minor)) { 476 debug("%s doesn't support ssh2", c->c_name); 477 confree(s); 478 return; 479 } 480 fprintf(stderr, "# %s:%d %s\n", c->c_name, ssh_port, chop(buf)); 481 keygrab_ssh2(c); 482 confree(s); 483 } 484 485 static void 486 conread(int s) 487 { 488 con *c = &fdcon[s]; 489 size_t n; 490 491 if (c->c_status == CS_CON) { 492 congreet(s); 493 return; 494 } 495 n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off); 496 if (n == 0) { 497 error("read (%s): %s", c->c_name, strerror(errno)); 498 confree(s); 499 return; 500 } 501 c->c_off += n; 502 503 if (c->c_off == c->c_len) 504 switch (c->c_status) { 505 case CS_SIZE: 506 c->c_plen = htonl(c->c_plen); 507 c->c_len = c->c_plen + 8 - (c->c_plen & 7); 508 c->c_off = 0; 509 c->c_data = xmalloc(c->c_len); 510 c->c_status = CS_KEYS; 511 break; 512 default: 513 fatal("conread: invalid status %d", c->c_status); 514 break; 515 } 516 517 contouch(s); 518 } 519 520 static void 521 conloop(void) 522 { 523 struct timeval seltime, now; 524 fd_set *r, *e; 525 con *c; 526 int i; 527 528 monotime_tv(&now); 529 c = TAILQ_FIRST(&tq); 530 531 if (c && (c->c_tv.tv_sec > now.tv_sec || 532 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) { 533 seltime = c->c_tv; 534 seltime.tv_sec -= now.tv_sec; 535 seltime.tv_usec -= now.tv_usec; 536 if (seltime.tv_usec < 0) { 537 seltime.tv_usec += 1000000; 538 seltime.tv_sec--; 539 } 540 } else 541 timerclear(&seltime); 542 543 r = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 544 e = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 545 memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask)); 546 memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask)); 547 548 while (select(maxfd, r, NULL, e, &seltime) == -1 && 549 (errno == EAGAIN || errno == EINTR)) 550 ; 551 552 for (i = 0; i < maxfd; i++) { 553 if (FD_ISSET(i, e)) { 554 error("%s: exception!", fdcon[i].c_name); 555 confree(i); 556 } else if (FD_ISSET(i, r)) 557 conread(i); 558 } 559 free(r); 560 free(e); 561 562 c = TAILQ_FIRST(&tq); 563 while (c && (c->c_tv.tv_sec < now.tv_sec || 564 (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) { 565 int s = c->c_fd; 566 567 c = TAILQ_NEXT(c, c_link); 568 conrecycle(s); 569 } 570 } 571 572 static void 573 do_host(char *host) 574 { 575 char *name = strnnsep(&host, " \t\n"); 576 int j; 577 578 if (name == NULL) 579 return; 580 for (j = KT_MIN; j <= KT_MAX; j *= 2) { 581 if (get_keytypes & j) { 582 while (ncon >= MAXCON) 583 conloop(); 584 conalloc(name, *host ? host : name, j); 585 } 586 } 587 } 588 589 void 590 fatal(const char *fmt,...) 591 { 592 va_list args; 593 594 va_start(args, fmt); 595 do_log(SYSLOG_LEVEL_FATAL, fmt, args); 596 va_end(args); 597 exit(255); 598 } 599 600 static void 601 usage(void) 602 { 603 fprintf(stderr, 604 "usage: %s [-46cHv] [-f file] [-p port] [-T timeout] [-t type]\n" 605 "\t\t [host | addrlist namelist] ...\n", 606 __progname); 607 exit(1); 608 } 609 610 int 611 main(int argc, char **argv) 612 { 613 int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO; 614 int opt, fopt_count = 0, j; 615 char *tname, *cp, line[NI_MAXHOST]; 616 FILE *fp; 617 u_long linenum; 618 619 extern int optind; 620 extern char *optarg; 621 622 ssh_malloc_init(); /* must be called before any mallocs */ 623 TAILQ_INIT(&tq); 624 625 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ 626 sanitise_stdfd(); 627 628 if (argc <= 1) 629 usage(); 630 631 while ((opt = getopt(argc, argv, "cHv46p:T:t:f:")) != -1) { 632 switch (opt) { 633 case 'H': 634 hash_hosts = 1; 635 break; 636 case 'c': 637 get_cert = 1; 638 break; 639 case 'p': 640 ssh_port = a2port(optarg); 641 if (ssh_port <= 0) { 642 fprintf(stderr, "Bad port '%s'\n", optarg); 643 exit(1); 644 } 645 break; 646 case 'T': 647 timeout = convtime(optarg); 648 if (timeout == -1 || timeout == 0) { 649 fprintf(stderr, "Bad timeout '%s'\n", optarg); 650 usage(); 651 } 652 break; 653 case 'v': 654 if (!debug_flag) { 655 debug_flag = 1; 656 log_level = SYSLOG_LEVEL_DEBUG1; 657 } 658 else if (log_level < SYSLOG_LEVEL_DEBUG3) 659 log_level++; 660 else 661 fatal("Too high debugging level."); 662 break; 663 case 'f': 664 if (strcmp(optarg, "-") == 0) 665 optarg = NULL; 666 argv[fopt_count++] = optarg; 667 break; 668 case 't': 669 get_keytypes = 0; 670 tname = strtok(optarg, ","); 671 while (tname) { 672 int type = sshkey_type_from_name(tname); 673 674 switch (type) { 675 case KEY_DSA: 676 get_keytypes |= KT_DSA; 677 break; 678 case KEY_ECDSA: 679 get_keytypes |= KT_ECDSA; 680 break; 681 case KEY_RSA: 682 get_keytypes |= KT_RSA; 683 break; 684 case KEY_ED25519: 685 get_keytypes |= KT_ED25519; 686 break; 687 case KEY_UNSPEC: 688 default: 689 fatal("Unknown key type \"%s\"", tname); 690 } 691 tname = strtok(NULL, ","); 692 } 693 break; 694 case '4': 695 IPv4or6 = AF_INET; 696 break; 697 case '6': 698 IPv4or6 = AF_INET6; 699 break; 700 case '?': 701 default: 702 usage(); 703 } 704 } 705 if (optind == argc && !fopt_count) 706 usage(); 707 708 log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1); 709 710 maxfd = fdlim_get(1); 711 if (maxfd < 0) 712 fatal("%s: fdlim_get: bad value", __progname); 713 if (maxfd > MAXMAXFD) 714 maxfd = MAXMAXFD; 715 if (MAXCON <= 0) 716 fatal("%s: not enough file descriptors", __progname); 717 if (maxfd > fdlim_get(0)) 718 fdlim_set(maxfd); 719 fdcon = xcalloc(maxfd, sizeof(con)); 720 721 read_wait_nfdset = howmany(maxfd, NFDBITS); 722 read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask)); 723 724 for (j = 0; j < fopt_count; j++) { 725 if (argv[j] == NULL) 726 fp = stdin; 727 else if ((fp = fopen(argv[j], "r")) == NULL) 728 fatal("%s: %s: %s", __progname, argv[j], 729 strerror(errno)); 730 linenum = 0; 731 732 while (read_keyfile_line(fp, 733 argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line), 734 &linenum) != -1) { 735 /* Chomp off trailing whitespace and comments */ 736 if ((cp = strchr(line, '#')) == NULL) 737 cp = line + strlen(line) - 1; 738 while (cp >= line) { 739 if (*cp == ' ' || *cp == '\t' || 740 *cp == '\n' || *cp == '#') 741 *cp-- = '\0'; 742 else 743 break; 744 } 745 746 /* Skip empty lines */ 747 if (*line == '\0') 748 continue; 749 750 do_host(line); 751 } 752 753 if (ferror(fp)) 754 fatal("%s: %s: %s", __progname, argv[j], 755 strerror(errno)); 756 757 fclose(fp); 758 } 759 760 while (optind < argc) 761 do_host(argv[optind++]); 762 763 while (ncon > 0) 764 conloop(); 765 766 return (0); 767 } 768