ssh-keyscan.c

   1 /*
   2  * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
   3  *
   4  * Modification and redistribution in source and binary forms is
   5  * permitted provided that due credit is given to the author and the
   6  * OpenBSD project by leaving this copyright notice intact.
   7  */
   8
   9 #include "includes.h"
  10 RCSID("$OpenBSD: ssh-keyscan.c,v 1.54 2005/05/24 17:32:44 avsm Exp $");
  11
  12 #include "openbsd-compat/sys-queue.h"
  13
  14 #include <openssl/bn.h>
  15
  16 #include <setjmp.h>
  17 #include "xmalloc.h"
  18 #include "ssh.h"
  19 #include "ssh1.h"
  20 #include "key.h"
  21 #include "kex.h"
  22 #include "compat.h"
  23 #include "myproposal.h"
  24 #include "packet.h"
  25 #include "dispatch.h"
  26 #include "buffer.h"
  27 #include "bufaux.h"
  28 #include "log.h"
  29 #include "atomicio.h"
  30 #include "misc.h"
  31 #include "hostfile.h"
  32
  33 /* Flag indicating whether IPv4 or IPv6.  This can be set on the command line.
  34    Default value is AF_UNSPEC means both IPv4 and IPv6. */
  35 int IPv4or6 = AF_UNSPEC;
  36
  37 int ssh_port = SSH_DEFAULT_PORT;
  38
  39 #define KT_RSA1 1
  40 #define KT_DSA  2
  41 #define KT_RSA  4
  42
  43 int get_keytypes = KT_RSA1;     /* Get only RSA1 keys by default */
  44
  45 int hash_hosts = 0;             /* Hash hostname on output */
  46
  47 #define MAXMAXFD 256
  48
  49 /* The number of seconds after which to give up on a TCP connection */
  50 int timeout = 5;
  51
  52 int maxfd;
  53 #define MAXCON (maxfd - 10)
  54
  55 extern char *__progname;
  56 fd_set *read_wait;
  57 size_t read_wait_size;
  58 int ncon;
  59 int nonfatal_fatal = 0;
  60 jmp_buf kexjmp;
  61 Key *kexjmp_key;
  62
  63 /*
  64  * Keep a connection structure for each file descriptor.  The state
  65  * associated with file descriptor n is held in fdcon[n].
  66  */
  67 typedef struct Connection {
  68         u_char c_status;        /* State of connection on this file desc. */
  69 #define CS_UNUSED 0             /* File descriptor unused */
  70 #define CS_CON 1                /* Waiting to connect/read greeting */
  71 #define CS_SIZE 2               /* Waiting to read initial packet size */
  72 #define CS_KEYS 3               /* Waiting to read public key packet */
  73         int c_fd;               /* Quick lookup: c->c_fd == c - fdcon */
  74         int c_plen;             /* Packet length field for ssh packet */
  75         int c_len;              /* Total bytes which must be read. */
  76         int c_off;              /* Length of data read so far. */
  77         int c_keytype;          /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
  78         char *c_namebase;       /* Address to free for c_name and c_namelist */
  79         char *c_name;           /* Hostname of connection for errors */
  80         char *c_namelist;       /* Pointer to other possible addresses */
  81         char *c_output_name;    /* Hostname of connection for output */
  82         char *c_data;           /* Data read from this fd */
  83         Kex *c_kex;             /* The key-exchange struct for ssh2 */
  84         struct timeval c_tv;    /* Time at which connection gets aborted */
  85         TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
  86 } con;
  87
  88 TAILQ_HEAD(conlist, Connection) tq;     /* Timeout Queue */
  89 con *fdcon;
  90
  91 /*
  92  *  This is just a wrapper around fgets() to make it usable.
  93  */
  94
  95 /* Stress-test.  Increase this later. */
  96 #define LINEBUF_SIZE 16
  97
  98 typedef struct {
  99         char *buf;
 100         u_int size;
 101         int lineno;
 102         const char *filename;
 103         FILE *stream;
 104         void (*errfun) (const char *,...);
 105 } Linebuf;
 106
 107 static Linebuf *
 108 Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
 109 {
 110         Linebuf *lb;
 111
 112         if (!(lb = malloc(sizeof(*lb)))) {
 113                 if (errfun)
 114                         (*errfun) ("linebuf (%s): malloc failed\n",
 115                             filename ? filename : "(stdin)");
 116                 return (NULL);
 117         }
 118         if (filename) {
 119                 lb->filename = filename;
 120                 if (!(lb->stream = fopen(filename, "r"))) {
 121                         xfree(lb);
 122                         if (errfun)
 123                                 (*errfun) ("%s: %s\n", filename, strerror(errno));
 124                         return (NULL);
 125                 }
 126         } else {
 127                 lb->filename = "(stdin)";
 128                 lb->stream = stdin;
 129         }
 130
 131         if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
 132                 if (errfun)
 133                         (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
 134                 xfree(lb);
 135                 return (NULL);
 136         }
 137         lb->errfun = errfun;
 138         lb->lineno = 0;
 139         return (lb);
 140 }
 141
 142 static void
 143 Linebuf_free(Linebuf * lb)
 144 {
 145         fclose(lb->stream);
 146         xfree(lb->buf);
 147         xfree(lb);
 148 }
 149
 150 #if 0
 151 static void
 152 Linebuf_restart(Linebuf * lb)
 153 {
 154         clearerr(lb->stream);
 155         rewind(lb->stream);
 156         lb->lineno = 0;
 157 }
 158
 159 static int
 160 Linebuf_lineno(Linebuf * lb)
 161 {
 162         return (lb->lineno);
 163 }
 164 #endif
 165
 166 static char *
 167 Linebuf_getline(Linebuf * lb)
 168 {
 169         int n = 0;
 170         void *p;
 171
 172         lb->lineno++;
 173         for (;;) {
 174                 /* Read a line */
 175                 if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
 176                         if (ferror(lb->stream) && lb->errfun)
 177                                 (*lb->errfun)("%s: %s\n", lb->filename,
 178                                     strerror(errno));
 179                         return (NULL);
 180                 }
 181                 n = strlen(lb->buf);
 182
 183                 /* Return it or an error if it fits */
 184                 if (n > 0 && lb->buf[n - 1] == '\n') {
 185                         lb->buf[n - 1] = '\0';
 186                         return (lb->buf);
 187                 }
 188                 if (n != lb->size - 1) {
 189                         if (lb->errfun)
 190                                 (*lb->errfun)("%s: skipping incomplete last line\n",
 191                                     lb->filename);
 192                         return (NULL);
 193                 }
 194                 /* Double the buffer if we need more space */
 195                 lb->size *= 2;
 196                 if ((p = realloc(lb->buf, lb->size)) == NULL) {
 197                         lb->size /= 2;
 198                         if (lb->errfun)
 199                                 (*lb->errfun)("linebuf (%s): realloc failed\n",
 200                                     lb->filename);
 201                         return (NULL);
 202                 }
 203                 lb->buf = p;
 204         }
 205 }
 206
 207 static int
 208 fdlim_get(int hard)
 209 {
 210 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
 211         struct rlimit rlfd;
 212
 213         if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
 214                 return (-1);
 215         if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
 216                 return SSH_SYSFDMAX;
 217         else
 218                 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
 219 #else
 220         return SSH_SYSFDMAX;
 221 #endif
 222 }
 223
 224 static int
 225 fdlim_set(int lim)
 226 {
 227 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
 228         struct rlimit rlfd;
 229 #endif
 230
 231         if (lim <= 0)
 232                 return (-1);
 233 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
 234         if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
 235                 return (-1);
 236         rlfd.rlim_cur = lim;
 237         if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
 238                 return (-1);
 239 #elif defined (HAVE_SETDTABLESIZE)
 240         setdtablesize(lim);
 241 #endif
 242         return (0);
 243 }
 244
 245 /*
 246  * This is an strsep function that returns a null field for adjacent
 247  * separators.  This is the same as the 4.4BSD strsep, but different from the
 248  * one in the GNU libc.
 249  */
 250 static char *
 251 xstrsep(char **str, const char *delim)
 252 {
 253         char *s, *e;
 254
 255         if (!**str)
 256                 return (NULL);
 257
 258         s = *str;
 259         e = s + strcspn(s, delim);
 260
 261         if (*e != '\0')
 262                 *e++ = '\0';
 263         *str = e;
 264
 265         return (s);
 266 }
 267
 268 /*
 269  * Get the next non-null token (like GNU strsep).  Strsep() will return a
 270  * null token for two adjacent separators, so we may have to loop.
 271  */
 272 static char *
 273 strnnsep(char **stringp, char *delim)
 274 {
 275         char *tok;
 276
 277         do {
 278                 tok = xstrsep(stringp, delim);
 279         } while (tok && *tok == '\0');
 280         return (tok);
 281 }
 282
 283 static Key *
 284 keygrab_ssh1(con *c)
 285 {
 286         static Key *rsa;
 287         static Buffer msg;
 288
 289         if (rsa == NULL) {
 290                 buffer_init(&msg);
 291                 rsa = key_new(KEY_RSA1);
 292         }
 293         buffer_append(&msg, c->c_data, c->c_plen);
 294         buffer_consume(&msg, 8 - (c->c_plen & 7));      /* padding */
 295         if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
 296                 error("%s: invalid packet type", c->c_name);
 297                 buffer_clear(&msg);
 298                 return NULL;
 299         }
 300         buffer_consume(&msg, 8);                /* cookie */
 301
 302         /* server key */
 303         (void) buffer_get_int(&msg);
 304         buffer_get_bignum(&msg, rsa->rsa->e);
 305         buffer_get_bignum(&msg, rsa->rsa->n);
 306
 307         /* host key */
 308         (void) buffer_get_int(&msg);
 309         buffer_get_bignum(&msg, rsa->rsa->e);
 310         buffer_get_bignum(&msg, rsa->rsa->n);
 311
 312         buffer_clear(&msg);
 313
 314         return (rsa);
 315 }
 316
 317 static int
 318 hostjump(Key *hostkey)
 319 {
 320         kexjmp_key = hostkey;
 321         longjmp(kexjmp, 1);
 322 }
 323
 324 static int
 325 ssh2_capable(int remote_major, int remote_minor)
 326 {
 327         switch (remote_major) {
 328         case 1:
 329                 if (remote_minor == 99)
 330                         return 1;
 331                 break;
 332         case 2:
 333                 return 1;
 334         default:
 335                 break;
 336         }
 337         return 0;
 338 }
 339
 340 static Key *
 341 keygrab_ssh2(con *c)
 342 {
 343         int j;
 344
 345         packet_set_connection(c->c_fd, c->c_fd);
 346         enable_compat20();
 347         myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
 348             "ssh-dss": "ssh-rsa";
 349         c->c_kex = kex_setup(myproposal);
 350         c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
 351         c->c_kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
 352         c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
 353         c->c_kex->verify_host_key = hostjump;
 354
 355         if (!(j = setjmp(kexjmp))) {
 356                 nonfatal_fatal = 1;
 357                 dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
 358                 fprintf(stderr, "Impossible! dispatch_run() returned!\n");
 359                 exit(1);
 360         }
 361         nonfatal_fatal = 0;
 362         xfree(c->c_kex);
 363         c->c_kex = NULL;
 364         packet_close();
 365
 366         return j < 0? NULL : kexjmp_key;
 367 }
 368
 369 static void
 370 keyprint(con *c, Key *key)
 371 {
 372         char *host = c->c_output_name ? c->c_output_name : c->c_name;
 373
 374         if (!key)
 375                 return;
 376         if (hash_hosts && (host = host_hash(host, NULL, 0)) == NULL)
 377                 fatal("host_hash failed");
 378
 379         fprintf(stdout, "%s ", host);
 380         key_write(key, stdout);
 381         fputs("\n", stdout);
 382 }
 383
 384 static int
 385 tcpconnect(char *host)
 386 {
 387         struct addrinfo hints, *ai, *aitop;
 388         char strport[NI_MAXSERV];
 389         int gaierr, s = -1;
 390
 391         snprintf(strport, sizeof strport, "%d", ssh_port);
 392         memset(&hints, 0, sizeof(hints));
 393         hints.ai_family = IPv4or6;
 394         hints.ai_socktype = SOCK_STREAM;
 395         if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
 396                 fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
 397         for (ai = aitop; ai; ai = ai->ai_next) {
 398                 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 399                 if (s < 0) {
 400                         error("socket: %s", strerror(errno));
 401                         continue;
 402                 }
 403                 if (set_nonblock(s) == -1)
 404                         fatal("%s: set_nonblock(%d)", __func__, s);
 405                 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
 406                     errno != EINPROGRESS)
 407                         error("connect (`%s'): %s", host, strerror(errno));
 408                 else
 409                         break;
 410                 close(s);
 411                 s = -1;
 412         }
 413         freeaddrinfo(aitop);
 414         return s;
 415 }
 416
 417 static int
 418 conalloc(char *iname, char *oname, int keytype)
 419 {
 420         char *namebase, *name, *namelist;
 421         int s;
 422
 423         namebase = namelist = xstrdup(iname);
 424
 425         do {
 426                 name = xstrsep(&namelist, ",");
 427                 if (!name) {
 428                         xfree(namebase);
 429                         return (-1);
 430                 }
 431         } while ((s = tcpconnect(name)) < 0);
 432
 433         if (s >= maxfd)
 434                 fatal("conalloc: fdno %d too high", s);
 435         if (fdcon[s].c_status)
 436                 fatal("conalloc: attempt to reuse fdno %d", s);
 437
 438         fdcon[s].c_fd = s;
 439         fdcon[s].c_status = CS_CON;
 440         fdcon[s].c_namebase = namebase;
 441         fdcon[s].c_name = name;
 442         fdcon[s].c_namelist = namelist;
 443         fdcon[s].c_output_name = xstrdup(oname);
 444         fdcon[s].c_data = (char *) &fdcon[s].c_plen;
 445         fdcon[s].c_len = 4;
 446         fdcon[s].c_off = 0;
 447         fdcon[s].c_keytype = keytype;
 448         gettimeofday(&fdcon[s].c_tv, NULL);
 449         fdcon[s].c_tv.tv_sec += timeout;
 450         TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
 451         FD_SET(s, read_wait);
 452         ncon++;
 453         return (s);
 454 }
 455
 456 static void
 457 confree(int s)
 458 {
 459         if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
 460                 fatal("confree: attempt to free bad fdno %d", s);
 461         close(s);
 462         xfree(fdcon[s].c_namebase);
 463         xfree(fdcon[s].c_output_name);
 464         if (fdcon[s].c_status == CS_KEYS)
 465                 xfree(fdcon[s].c_data);
 466         fdcon[s].c_status = CS_UNUSED;
 467         fdcon[s].c_keytype = 0;
 468         TAILQ_REMOVE(&tq, &fdcon[s], c_link);
 469         FD_CLR(s, read_wait);
 470         ncon--;
 471 }
 472
 473 static void
 474 contouch(int s)
 475 {
 476         TAILQ_REMOVE(&tq, &fdcon[s], c_link);
 477         gettimeofday(&fdcon[s].c_tv, NULL);
 478         fdcon[s].c_tv.tv_sec += timeout;
 479         TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
 480 }
 481
 482 static int
 483 conrecycle(int s)
 484 {
 485         con *c = &fdcon[s];
 486         int ret;
 487
 488         ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
 489         confree(s);
 490         return (ret);
 491 }
 492
 493 static void
 494 congreet(int s)
 495 {
 496         int remote_major = 0, remote_minor = 0;
 497         char buf[256], *cp;
 498         char remote_version[sizeof buf];
 499         size_t bufsiz, n = 0;
 500         con *c = &fdcon[s];
 501
 502         bufsiz = sizeof(buf);
 503         cp = buf;
 504         while (bufsiz-- && (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
 505                 if (*cp == '\r')
 506                         *cp = '\n';
 507                 cp++;
 508         }
 509         if (n == 0) {
 510                 switch (errno) {
 511                 case EPIPE:
 512                         error("%s: Connection closed by remote host", c->c_name);
 513                         break;
 514                 case ECONNREFUSED:
 515                         break;
 516                 default:
 517                         error("read (%s): %s", c->c_name, strerror(errno));
 518                         break;
 519                 }
 520                 conrecycle(s);
 521                 return;
 522         }
 523         if (*cp != '\n' && *cp != '\r') {
 524                 error("%s: bad greeting", c->c_name);
 525                 confree(s);
 526                 return;
 527         }
 528         *cp = '\0';
 529         if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
 530             &remote_major, &remote_minor, remote_version) == 3)
 531                 compat_datafellows(remote_version);
 532         else
 533                 datafellows = 0;
 534         if (c->c_keytype != KT_RSA1) {
 535                 if (!ssh2_capable(remote_major, remote_minor)) {
 536                         debug("%s doesn't support ssh2", c->c_name);
 537                         confree(s);
 538                         return;
 539                 }
 540         } else if (remote_major != 1) {
 541                 debug("%s doesn't support ssh1", c->c_name);
 542                 confree(s);
 543                 return;
 544         }
 545         fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
 546         n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
 547             c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
 548             c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
 549         if (n == -1 || n >= sizeof buf) {
 550                 error("snprintf: buffer too small");
 551                 confree(s);
 552                 return;
 553         }
 554         if (atomicio(vwrite, s, buf, n) != n) {
 555                 error("write (%s): %s", c->c_name, strerror(errno));
 556                 confree(s);
 557                 return;
 558         }
 559         if (c->c_keytype != KT_RSA1) {
 560                 keyprint(c, keygrab_ssh2(c));
 561                 confree(s);
 562                 return;
 563         }
 564         c->c_status = CS_SIZE;
 565         contouch(s);
 566 }
 567
 568 static void
 569 conread(int s)
 570 {
 571         con *c = &fdcon[s];
 572         size_t n;
 573
 574         if (c->c_status == CS_CON) {
 575                 congreet(s);
 576                 return;
 577         }
 578         n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
 579         if (n == 0) {
 580                 error("read (%s): %s", c->c_name, strerror(errno));
 581                 confree(s);
 582                 return;
 583         }
 584         c->c_off += n;
 585
 586         if (c->c_off == c->c_len)
 587                 switch (c->c_status) {
 588                 case CS_SIZE:
 589                         c->c_plen = htonl(c->c_plen);
 590                         c->c_len = c->c_plen + 8 - (c->c_plen & 7);
 591                         c->c_off = 0;
 592                         c->c_data = xmalloc(c->c_len);
 593                         c->c_status = CS_KEYS;
 594                         break;
 595                 case CS_KEYS:
 596                         keyprint(c, keygrab_ssh1(c));
 597                         confree(s);
 598                         return;
 599                         break;
 600                 default:
 601                         fatal("conread: invalid status %d", c->c_status);
 602                         break;
 603                 }
 604
 605         contouch(s);
 606 }
 607
 608 static void
 609 conloop(void)
 610 {
 611         struct timeval seltime, now;
 612         fd_set *r, *e;
 613         con *c;
 614         int i;
 615
 616         gettimeofday(&now, NULL);
 617         c = TAILQ_FIRST(&tq);
 618
 619         if (c && (c->c_tv.tv_sec > now.tv_sec ||
 620             (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
 621                 seltime = c->c_tv;
 622                 seltime.tv_sec -= now.tv_sec;
 623                 seltime.tv_usec -= now.tv_usec;
 624                 if (seltime.tv_usec < 0) {
 625                         seltime.tv_usec += 1000000;
 626                         seltime.tv_sec--;
 627                 }
 628         } else
 629                 seltime.tv_sec = seltime.tv_usec = 0;
 630
 631         r = xmalloc(read_wait_size);
 632         memcpy(r, read_wait, read_wait_size);
 633         e = xmalloc(read_wait_size);
 634         memcpy(e, read_wait, read_wait_size);
 635
 636         while (select(maxfd, r, NULL, e, &seltime) == -1 &&
 637             (errno == EAGAIN || errno == EINTR))
 638                 ;
 639
 640         for (i = 0; i < maxfd; i++) {
 641                 if (FD_ISSET(i, e)) {
 642                         error("%s: exception!", fdcon[i].c_name);
 643                         confree(i);
 644                 } else if (FD_ISSET(i, r))
 645                         conread(i);
 646         }
 647         xfree(r);
 648         xfree(e);
 649
 650         c = TAILQ_FIRST(&tq);
 651         while (c && (c->c_tv.tv_sec < now.tv_sec ||
 652             (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
 653                 int s = c->c_fd;
 654
 655                 c = TAILQ_NEXT(c, c_link);
 656                 conrecycle(s);
 657         }
 658 }
 659
 660 static void
 661 do_host(char *host)
 662 {
 663         char *name = strnnsep(&host, " \t\n");
 664         int j;
 665
 666         if (name == NULL)
 667                 return;
 668         for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
 669                 if (get_keytypes & j) {
 670                         while (ncon >= MAXCON)
 671                                 conloop();
 672                         conalloc(name, *host ? host : name, j);
 673                 }
 674         }
 675 }
 676
 677 void
 678 fatal(const char *fmt,...)
 679 {
 680         va_list args;
 681
 682         va_start(args, fmt);
 683         do_log(SYSLOG_LEVEL_FATAL, fmt, args);
 684         va_end(args);
 685         if (nonfatal_fatal)
 686                 longjmp(kexjmp, -1);
 687         else
 688                 exit(255);
 689 }
 690
 691 static void
 692 usage(void)
 693 {
 694         fprintf(stderr, "usage: %s [-46Hv] [-f file] [-p port] [-T timeout] [-t type]\n"
 695             "\t\t   [host | addrlist namelist] [...]\n",
 696             __progname);
 697         exit(1);
 698 }
 699
 700 int
 701 main(int argc, char **argv)
 702 {
 703         int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
 704         int opt, fopt_count = 0;
 705         char *tname;
 706
 707         extern int optind;
 708         extern char *optarg;
 709
 710         __progname = ssh_get_progname(argv[0]);
 711         init_rng();
 712         seed_rng();
 713         TAILQ_INIT(&tq);
 714
 715         if (argc <= 1)
 716                 usage();
 717
 718         while ((opt = getopt(argc, argv, "Hv46p:T:t:f:")) != -1) {
 719                 switch (opt) {
 720                 case 'H':
 721                         hash_hosts = 1;
 722                         break;
 723                 case 'p':
 724                         ssh_port = a2port(optarg);
 725                         if (ssh_port == 0) {
 726                                 fprintf(stderr, "Bad port '%s'\n", optarg);
 727                                 exit(1);
 728                         }
 729                         break;
 730                 case 'T':
 731                         timeout = convtime(optarg);
 732                         if (timeout == -1 || timeout == 0) {
 733                                 fprintf(stderr, "Bad timeout '%s'\n", optarg);
 734                                 usage();
 735                         }
 736                         break;
 737                 case 'v':
 738                         if (!debug_flag) {
 739                                 debug_flag = 1;
 740                                 log_level = SYSLOG_LEVEL_DEBUG1;
 741                         }
 742                         else if (log_level < SYSLOG_LEVEL_DEBUG3)
 743                                 log_level++;
 744                         else
 745                                 fatal("Too high debugging level.");
 746                         break;
 747                 case 'f':
 748                         if (strcmp(optarg, "-") == 0)
 749                                 optarg = NULL;
 750                         argv[fopt_count++] = optarg;
 751                         break;
 752                 case 't':
 753                         get_keytypes = 0;
 754                         tname = strtok(optarg, ",");
 755                         while (tname) {
 756                                 int type = key_type_from_name(tname);
 757                                 switch (type) {
 758                                 case KEY_RSA1:
 759                                         get_keytypes |= KT_RSA1;
 760                                         break;
 761                                 case KEY_DSA:
 762                                         get_keytypes |= KT_DSA;
 763                                         break;
 764                                 case KEY_RSA:
 765                                         get_keytypes |= KT_RSA;
 766                                         break;
 767                                 case KEY_UNSPEC:
 768                                         fatal("unknown key type %s", tname);
 769                                 }
 770                                 tname = strtok(NULL, ",");
 771                         }
 772                         break;
 773                 case '4':
 774                         IPv4or6 = AF_INET;
 775                         break;
 776                 case '6':
 777                         IPv4or6 = AF_INET6;
 778                         break;
 779                 case '?':
 780                 default:
 781                         usage();
 782                 }
 783         }
 784         if (optind == argc && !fopt_count)
 785                 usage();
 786
 787         log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
 788
 789         maxfd = fdlim_get(1);
 790         if (maxfd < 0)
 791                 fatal("%s: fdlim_get: bad value", __progname);
 792         if (maxfd > MAXMAXFD)
 793                 maxfd = MAXMAXFD;
 794         if (MAXCON <= 0)
 795                 fatal("%s: not enough file descriptors", __progname);
 796         if (maxfd > fdlim_get(0))
 797                 fdlim_set(maxfd);
 798         fdcon = xmalloc(maxfd * sizeof(con));
 799         memset(fdcon, 0, maxfd * sizeof(con));
 800
 801         read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
 802         read_wait = xmalloc(read_wait_size);
 803         memset(read_wait, 0, read_wait_size);
 804
 805         if (fopt_count) {
 806                 Linebuf *lb;
 807                 char *line;
 808                 int j;
 809
 810                 for (j = 0; j < fopt_count; j++) {
 811                         lb = Linebuf_alloc(argv[j], error);
 812                         if (!lb)
 813                                 continue;
 814                         while ((line = Linebuf_getline(lb)) != NULL)
 815                                 do_host(line);
 816                         Linebuf_free(lb);
 817                 }
 818         }
 819
 820         while (optind < argc)
 821                 do_host(argv[optind++]);
 822
 823         while (ncon > 0)
 824                 conloop();
 825
 826         return (0);
 827 }