crypto/openssh/ssh-keyscan.c

   1 /* $OpenBSD: ssh-keyscan.c,v 1.115 2017/06/30 04:17:23 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 "includes.h"
  11
  12 #include <sys/types.h>
  13 #include "openbsd-compat/sys-queue.h"
  14 #include <sys/resource.h>
  15 #ifdef HAVE_SYS_TIME_H
  16 # include <sys/time.h>
  17 #endif
  18
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21
  22 #include <openssl/bn.h>
  23
  24 #include <netdb.h>
  25 #include <errno.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <signal.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32
  33 #include "xmalloc.h"
  34 #include "ssh.h"
  35 #include "sshbuf.h"
  36 #include "sshkey.h"
  37 #include "cipher.h"
  38 #include "kex.h"
  39 #include "compat.h"
  40 #include "myproposal.h"
  41 #include "packet.h"
  42 #include "dispatch.h"
  43 #include "log.h"
  44 #include "atomicio.h"
  45 #include "misc.h"
  46 #include "hostfile.h"
  47 #include "ssherr.h"
  48 #include "ssh_api.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
  61 #define KT_MIN          KT_DSA
  62 #define KT_MAX          KT_ED25519
  63
  64 int get_cert = 0;
  65 int get_keytypes = KT_RSA|KT_ECDSA|KT_ED25519;
  66
  67 int hash_hosts = 0;             /* Hash hostname on output */
  68
  69 #define MAXMAXFD 256
  70
  71 /* The number of seconds after which to give up on a TCP connection */
  72 int timeout = 5;
  73
  74 int maxfd;
  75 #define MAXCON (maxfd - 10)
  76
  77 extern char *__progname;
  78 fd_set *read_wait;
  79 size_t read_wait_nfdset;
  80 int ncon;
  81
  82 struct ssh *active_state = NULL; /* XXX needed for linking */
  83
  84 /*
  85  * Keep a connection structure for each file descriptor.  The state
  86  * associated with file descriptor n is held in fdcon[n].
  87  */
  88 typedef struct Connection {
  89         u_char c_status;        /* State of connection on this file desc. */
  90 #define CS_UNUSED 0             /* File descriptor unused */
  91 #define CS_CON 1                /* Waiting to connect/read greeting */
  92 #define CS_SIZE 2               /* Waiting to read initial packet size */
  93 #define CS_KEYS 3               /* Waiting to read public key packet */
  94         int c_fd;               /* Quick lookup: c->c_fd == c - fdcon */
  95         int c_plen;             /* Packet length field for ssh packet */
  96         int c_len;              /* Total bytes which must be read. */
  97         int c_off;              /* Length of data read so far. */
  98         int c_keytype;          /* Only one of KT_* */
  99         sig_atomic_t c_done;    /* SSH2 done */
 100         char *c_namebase;       /* Address to free for c_name and c_namelist */
 101         char *c_name;           /* Hostname of connection for errors */
 102         char *c_namelist;       /* Pointer to other possible addresses */
 103         char *c_output_name;    /* Hostname of connection for output */
 104         char *c_data;           /* Data read from this fd */
 105         struct ssh *c_ssh;      /* SSH-connection */
 106         struct timeval c_tv;    /* Time at which connection gets aborted */
 107         TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
 108 } con;
 109
 110 TAILQ_HEAD(conlist, Connection) tq;     /* Timeout Queue */
 111 con *fdcon;
 112
 113 static void keyprint(con *c, struct sshkey *key);
 114
 115 static int
 116 fdlim_get(int hard)
 117 {
 118 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
 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 SSH_SYSFDMAX;
 125         else
 126                 return hard ? rlfd.rlim_max : rlfd.rlim_cur;
 127 #else
 128         return SSH_SYSFDMAX;
 129 #endif
 130 }
 131
 132 static int
 133 fdlim_set(int lim)
 134 {
 135 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
 136         struct rlimit rlfd;
 137 #endif
 138
 139         if (lim <= 0)
 140                 return (-1);
 141 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
 142         if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
 143                 return (-1);
 144         rlfd.rlim_cur = lim;
 145         if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
 146                 return (-1);
 147 #elif defined (HAVE_SETDTABLESIZE)
 148         setdtablesize(lim);
 149 #endif
 150         return (0);
 151 }
 152
 153 /*
 154  * This is an strsep function that returns a null field for adjacent
 155  * separators.  This is the same as the 4.4BSD strsep, but different from the
 156  * one in the GNU libc.
 157  */
 158 static char *
 159 xstrsep(char **str, const char *delim)
 160 {
 161         char *s, *e;
 162
 163         if (!**str)
 164                 return (NULL);
 165
 166         s = *str;
 167         e = s + strcspn(s, delim);
 168
 169         if (*e != '\0')
 170                 *e++ = '\0';
 171         *str = e;
 172
 173         return (s);
 174 }
 175
 176 /*
 177  * Get the next non-null token (like GNU strsep).  Strsep() will return a
 178  * null token for two adjacent separators, so we may have to loop.
 179  */
 180 static char *
 181 strnnsep(char **stringp, char *delim)
 182 {
 183         char *tok;
 184
 185         do {
 186                 tok = xstrsep(stringp, delim);
 187         } while (tok && *tok == '\0');
 188         return (tok);
 189 }
 190
 191
 192 static int
 193 key_print_wrapper(struct sshkey *hostkey, struct ssh *ssh)
 194 {
 195         con *c;
 196
 197         if ((c = ssh_get_app_data(ssh)) != NULL)
 198                 keyprint(c, hostkey);
 199         /* always abort key exchange */
 200         return -1;
 201 }
 202
 203 static int
 204 ssh2_capable(int remote_major, int remote_minor)
 205 {
 206         switch (remote_major) {
 207         case 1:
 208                 if (remote_minor == 99)
 209                         return 1;
 210                 break;
 211         case 2:
 212                 return 1;
 213         default:
 214                 break;
 215         }
 216         return 0;
 217 }
 218
 219 static void
 220 keygrab_ssh2(con *c)
 221 {
 222         char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
 223         int r;
 224
 225         switch (c->c_keytype) {
 226         case KT_DSA:
 227                 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
 228                     "ssh-dss-cert-v01@openssh.com" : "ssh-dss";
 229                 break;
 230         case KT_RSA:
 231                 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
 232                     "ssh-rsa-cert-v01@openssh.com" : "ssh-rsa";
 233                 break;
 234         case KT_ED25519:
 235                 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
 236                     "ssh-ed25519-cert-v01@openssh.com" : "ssh-ed25519";
 237                 break;
 238         case KT_ECDSA:
 239                 myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = get_cert ?
 240                     "ecdsa-sha2-nistp256-cert-v01@openssh.com,"
 241                     "ecdsa-sha2-nistp384-cert-v01@openssh.com,"
 242                     "ecdsa-sha2-nistp521-cert-v01@openssh.com" :
 243                     "ecdsa-sha2-nistp256,"
 244                     "ecdsa-sha2-nistp384,"
 245                     "ecdsa-sha2-nistp521";
 246                 break;
 247         default:
 248                 fatal("unknown key type %d", c->c_keytype);
 249                 break;
 250         }
 251         if ((r = kex_setup(c->c_ssh, myproposal)) != 0) {
 252                 free(c->c_ssh);
 253                 fprintf(stderr, "kex_setup: %s\n", ssh_err(r));
 254                 exit(1);
 255         }
 256 #ifdef WITH_OPENSSL
 257         c->c_ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
 258         c->c_ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
 259         c->c_ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client;
 260         c->c_ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client;
 261         c->c_ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client;
 262         c->c_ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
 263         c->c_ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
 264 # ifdef OPENSSL_HAS_ECC
 265         c->c_ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
 266 # endif
 267 #endif
 268         c->c_ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
 269         ssh_set_verify_host_key_callback(c->c_ssh, key_print_wrapper);
 270         /*
 271          * do the key-exchange until an error occurs or until
 272          * the key_print_wrapper() callback sets c_done.
 273          */
 274         ssh_dispatch_run(c->c_ssh, DISPATCH_BLOCK, &c->c_done);
 275 }
 276
 277 static void
 278 keyprint_one(const char *host, struct sshkey *key)
 279 {
 280         char *hostport;
 281         const char *known_host, *hashed;
 282
 283         hostport = put_host_port(host, ssh_port);
 284         lowercase(hostport);
 285         if (hash_hosts && (hashed = host_hash(host, NULL, 0)) == NULL)
 286                 fatal("host_hash failed");
 287         known_host = hash_hosts ? hashed : hostport;
 288         if (!get_cert)
 289                 fprintf(stdout, "%s ", known_host);
 290         sshkey_write(key, stdout);
 291         fputs("\n", stdout);
 292         free(hostport);
 293 }
 294
 295 static void
 296 keyprint(con *c, struct sshkey *key)
 297 {
 298         char *hosts = c->c_output_name ? c->c_output_name : c->c_name;
 299         char *host, *ohosts;
 300
 301         if (key == NULL)
 302                 return;
 303         if (get_cert || (!hash_hosts && ssh_port == SSH_DEFAULT_PORT)) {
 304                 keyprint_one(hosts, key);
 305                 return;
 306         }
 307         ohosts = hosts = xstrdup(hosts);
 308         while ((host = strsep(&hosts, ",")) != NULL)
 309                 keyprint_one(host, key);
 310         free(ohosts);
 311 }
 312
 313 static int
 314 tcpconnect(char *host)
 315 {
 316         struct addrinfo hints, *ai, *aitop;
 317         char strport[NI_MAXSERV];
 318         int gaierr, s = -1;
 319
 320         snprintf(strport, sizeof strport, "%d", ssh_port);
 321         memset(&hints, 0, sizeof(hints));
 322         hints.ai_family = IPv4or6;
 323         hints.ai_socktype = SOCK_STREAM;
 324         if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
 325                 error("getaddrinfo %s: %s", host, ssh_gai_strerror(gaierr));
 326                 return -1;
 327         }
 328         for (ai = aitop; ai; ai = ai->ai_next) {
 329                 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 330                 if (s < 0) {
 331                         error("socket: %s", strerror(errno));
 332                         continue;
 333                 }
 334                 if (set_nonblock(s) == -1)
 335                         fatal("%s: set_nonblock(%d)", __func__, s);
 336                 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
 337                     errno != EINPROGRESS)
 338                         error("connect (`%s'): %s", host, strerror(errno));
 339                 else
 340                         break;
 341                 close(s);
 342                 s = -1;
 343         }
 344         freeaddrinfo(aitop);
 345         return s;
 346 }
 347
 348 static int
 349 conalloc(char *iname, char *oname, int keytype)
 350 {
 351         char *namebase, *name, *namelist;
 352         int s;
 353
 354         namebase = namelist = xstrdup(iname);
 355
 356         do {
 357                 name = xstrsep(&namelist, ",");
 358                 if (!name) {
 359                         free(namebase);
 360                         return (-1);
 361                 }
 362         } while ((s = tcpconnect(name)) < 0);
 363
 364         if (s >= maxfd)
 365                 fatal("conalloc: fdno %d too high", s);
 366         if (fdcon[s].c_status)
 367                 fatal("conalloc: attempt to reuse fdno %d", s);
 368
 369         debug3("%s: oname %s kt %d", __func__, oname, keytype);
 370         fdcon[s].c_fd = s;
 371         fdcon[s].c_status = CS_CON;
 372         fdcon[s].c_namebase = namebase;
 373         fdcon[s].c_name = name;
 374         fdcon[s].c_namelist = namelist;
 375         fdcon[s].c_output_name = xstrdup(oname);
 376         fdcon[s].c_data = (char *) &fdcon[s].c_plen;
 377         fdcon[s].c_len = 4;
 378         fdcon[s].c_off = 0;
 379         fdcon[s].c_keytype = keytype;
 380         gettimeofday(&fdcon[s].c_tv, NULL);
 381         fdcon[s].c_tv.tv_sec += timeout;
 382         TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
 383         FD_SET(s, read_wait);
 384         ncon++;
 385         return (s);
 386 }
 387
 388 static void
 389 confree(int s)
 390 {
 391         if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
 392                 fatal("confree: attempt to free bad fdno %d", s);
 393         free(fdcon[s].c_namebase);
 394         free(fdcon[s].c_output_name);
 395         if (fdcon[s].c_status == CS_KEYS)
 396                 free(fdcon[s].c_data);
 397         fdcon[s].c_status = CS_UNUSED;
 398         fdcon[s].c_keytype = 0;
 399         if (fdcon[s].c_ssh) {
 400                 ssh_packet_close(fdcon[s].c_ssh);
 401                 free(fdcon[s].c_ssh);
 402                 fdcon[s].c_ssh = NULL;
 403         } else
 404                 close(s);
 405         TAILQ_REMOVE(&tq, &fdcon[s], c_link);
 406         FD_CLR(s, read_wait);
 407         ncon--;
 408 }
 409
 410 static void
 411 contouch(int s)
 412 {
 413         TAILQ_REMOVE(&tq, &fdcon[s], c_link);
 414         gettimeofday(&fdcon[s].c_tv, NULL);
 415         fdcon[s].c_tv.tv_sec += timeout;
 416         TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
 417 }
 418
 419 static int
 420 conrecycle(int s)
 421 {
 422         con *c = &fdcon[s];
 423         int ret;
 424
 425         ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
 426         confree(s);
 427         return (ret);
 428 }
 429
 430 static void
 431 congreet(int s)
 432 {
 433         int n = 0, remote_major = 0, remote_minor = 0;
 434         char buf[256], *cp;
 435         char remote_version[sizeof buf];
 436         size_t bufsiz;
 437         con *c = &fdcon[s];
 438
 439         /* send client banner */
 440         n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
 441             PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
 442         if (n < 0 || (size_t)n >= sizeof(buf)) {
 443                 error("snprintf: buffer too small");
 444                 confree(s);
 445                 return;
 446         }
 447         if (atomicio(vwrite, s, buf, n) != (size_t)n) {
 448                 error("write (%s): %s", c->c_name, strerror(errno));
 449                 confree(s);
 450                 return;
 451         }
 452
 453         for (;;) {
 454                 memset(buf, '\0', sizeof(buf));
 455                 bufsiz = sizeof(buf);
 456                 cp = buf;
 457                 while (bufsiz-- &&
 458                     (n = atomicio(read, s, cp, 1)) == 1 && *cp != '\n') {
 459                         if (*cp == '\r')
 460                                 *cp = '\n';
 461                         cp++;
 462                 }
 463                 if (n != 1 || strncmp(buf, "SSH-", 4) == 0)
 464                         break;
 465         }
 466         if (n == 0) {
 467                 switch (errno) {
 468                 case EPIPE:
 469                         error("%s: Connection closed by remote host", c->c_name);
 470                         break;
 471                 case ECONNREFUSED:
 472                         break;
 473                 default:
 474                         error("read (%s): %s", c->c_name, strerror(errno));
 475                         break;
 476                 }
 477                 conrecycle(s);
 478                 return;
 479         }
 480         if (*cp != '\n' && *cp != '\r') {
 481                 error("%s: bad greeting", c->c_name);
 482                 confree(s);
 483                 return;
 484         }
 485         *cp = '\0';
 486         if ((c->c_ssh = ssh_packet_set_connection(NULL, s, s)) == NULL)
 487                 fatal("ssh_packet_set_connection failed");
 488         ssh_packet_set_timeout(c->c_ssh, timeout, 1);
 489         ssh_set_app_data(c->c_ssh, c);  /* back link */
 490         if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
 491             &remote_major, &remote_minor, remote_version) == 3)
 492                 c->c_ssh->compat = compat_datafellows(remote_version);
 493         else
 494                 c->c_ssh->compat = 0;
 495         if (!ssh2_capable(remote_major, remote_minor)) {
 496                 debug("%s doesn't support ssh2", c->c_name);
 497                 confree(s);
 498                 return;
 499         }
 500         fprintf(stderr, "# %s:%d %s\n", c->c_name, ssh_port, chop(buf));
 501         keygrab_ssh2(c);
 502         confree(s);
 503 }
 504
 505 static void
 506 conread(int s)
 507 {
 508         con *c = &fdcon[s];
 509         size_t n;
 510
 511         if (c->c_status == CS_CON) {
 512                 congreet(s);
 513                 return;
 514         }
 515         n = atomicio(read, s, c->c_data + c->c_off, c->c_len - c->c_off);
 516         if (n == 0) {
 517                 error("read (%s): %s", c->c_name, strerror(errno));
 518                 confree(s);
 519                 return;
 520         }
 521         c->c_off += n;
 522
 523         if (c->c_off == c->c_len)
 524                 switch (c->c_status) {
 525                 case CS_SIZE:
 526                         c->c_plen = htonl(c->c_plen);
 527                         c->c_len = c->c_plen + 8 - (c->c_plen & 7);
 528                         c->c_off = 0;
 529                         c->c_data = xmalloc(c->c_len);
 530                         c->c_status = CS_KEYS;
 531                         break;
 532                 default:
 533                         fatal("conread: invalid status %d", c->c_status);
 534                         break;
 535                 }
 536
 537         contouch(s);
 538 }
 539
 540 static void
 541 conloop(void)
 542 {
 543         struct timeval seltime, now;
 544         fd_set *r, *e;
 545         con *c;
 546         int i;
 547
 548         gettimeofday(&now, NULL);
 549         c = TAILQ_FIRST(&tq);
 550
 551         if (c && (c->c_tv.tv_sec > now.tv_sec ||
 552             (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
 553                 seltime = c->c_tv;
 554                 seltime.tv_sec -= now.tv_sec;
 555                 seltime.tv_usec -= now.tv_usec;
 556                 if (seltime.tv_usec < 0) {
 557                         seltime.tv_usec += 1000000;
 558                         seltime.tv_sec--;
 559                 }
 560         } else
 561                 timerclear(&seltime);
 562
 563         r = xcalloc(read_wait_nfdset, sizeof(fd_mask));
 564         e = xcalloc(read_wait_nfdset, sizeof(fd_mask));
 565         memcpy(r, read_wait, read_wait_nfdset * sizeof(fd_mask));
 566         memcpy(e, read_wait, read_wait_nfdset * sizeof(fd_mask));
 567
 568         while (select(maxfd, r, NULL, e, &seltime) == -1 &&
 569             (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
 570                 ;
 571
 572         for (i = 0; i < maxfd; i++) {
 573                 if (FD_ISSET(i, e)) {
 574                         error("%s: exception!", fdcon[i].c_name);
 575                         confree(i);
 576                 } else if (FD_ISSET(i, r))
 577                         conread(i);
 578         }
 579         free(r);
 580         free(e);
 581
 582         c = TAILQ_FIRST(&tq);
 583         while (c && (c->c_tv.tv_sec < now.tv_sec ||
 584             (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
 585                 int s = c->c_fd;
 586
 587                 c = TAILQ_NEXT(c, c_link);
 588                 conrecycle(s);
 589         }
 590 }
 591
 592 static void
 593 do_host(char *host)
 594 {
 595         char *name = strnnsep(&host, " \t\n");
 596         int j;
 597
 598         if (name == NULL)
 599                 return;
 600         for (j = KT_MIN; j <= KT_MAX; j *= 2) {
 601                 if (get_keytypes & j) {
 602                         while (ncon >= MAXCON)
 603                                 conloop();
 604                         conalloc(name, *host ? host : name, j);
 605                 }
 606         }
 607 }
 608
 609 void
 610 fatal(const char *fmt,...)
 611 {
 612         va_list args;
 613
 614         va_start(args, fmt);
 615         do_log(SYSLOG_LEVEL_FATAL, fmt, args);
 616         va_end(args);
 617         exit(255);
 618 }
 619
 620 static void
 621 usage(void)
 622 {
 623         fprintf(stderr,
 624             "usage: %s [-46cHv] [-f file] [-p port] [-T timeout] [-t type]\n"
 625             "\t\t   [host | addrlist namelist] ...\n",
 626             __progname);
 627         exit(1);
 628 }
 629
 630 int
 631 main(int argc, char **argv)
 632 {
 633         int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
 634         int opt, fopt_count = 0, j;
 635         char *tname, *cp, line[NI_MAXHOST];
 636         FILE *fp;
 637         u_long linenum;
 638
 639         extern int optind;
 640         extern char *optarg;
 641
 642         ssh_malloc_init();      /* must be called before any mallocs */
 643         __progname = ssh_get_progname(argv[0]);
 644         seed_rng();
 645         TAILQ_INIT(&tq);
 646
 647         /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
 648         sanitise_stdfd();
 649
 650         if (argc <= 1)
 651                 usage();
 652
 653         while ((opt = getopt(argc, argv, "cHv46p:T:t:f:")) != -1) {
 654                 switch (opt) {
 655                 case 'H':
 656                         hash_hosts = 1;
 657                         break;
 658                 case 'c':
 659                         get_cert = 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_UNSPEC:
 710                                 default:
 711                                         fatal("Unknown key type \"%s\"", tname);
 712                                 }
 713                                 tname = strtok(NULL, ",");
 714                         }
 715                         break;
 716                 case '4':
 717                         IPv4or6 = AF_INET;
 718                         break;
 719                 case '6':
 720                         IPv4or6 = AF_INET6;
 721                         break;
 722                 case '?':
 723                 default:
 724                         usage();
 725                 }
 726         }
 727         if (optind == argc && !fopt_count)
 728                 usage();
 729
 730         log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
 731
 732         maxfd = fdlim_get(1);
 733         if (maxfd < 0)
 734                 fatal("%s: fdlim_get: bad value", __progname);
 735         if (maxfd > MAXMAXFD)
 736                 maxfd = MAXMAXFD;
 737         if (MAXCON <= 0)
 738                 fatal("%s: not enough file descriptors", __progname);
 739         if (maxfd > fdlim_get(0))
 740                 fdlim_set(maxfd);
 741         fdcon = xcalloc(maxfd, sizeof(con));
 742
 743         read_wait_nfdset = howmany(maxfd, NFDBITS);
 744         read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));
 745
 746         for (j = 0; j < fopt_count; j++) {
 747                 if (argv[j] == NULL)
 748                         fp = stdin;
 749                 else if ((fp = fopen(argv[j], "r")) == NULL)
 750                         fatal("%s: %s: %s", __progname, argv[j],
 751                             strerror(errno));
 752                 linenum = 0;
 753
 754                 while (read_keyfile_line(fp,
 755                     argv[j] == NULL ? "(stdin)" : argv[j], line, sizeof(line),
 756                     &linenum) != -1) {
 757                         /* Chomp off trailing whitespace and comments */
 758                         if ((cp = strchr(line, '#')) == NULL)
 759                                 cp = line + strlen(line) - 1;
 760                         while (cp >= line) {
 761                                 if (*cp == ' ' || *cp == '\t' ||
 762                                     *cp == '\n' || *cp == '#')
 763                                         *cp-- = '\0';
 764                                 else
 765                                         break;
 766                         }
 767
 768                         /* Skip empty lines */
 769                         if (*line == '\0')
 770                                 continue;
 771
 772                         do_host(line);
 773                 }
 774
 775                 if (ferror(fp))
 776                         fatal("%s: %s: %s", __progname, argv[j],
 777                             strerror(errno));
 778
 779                 fclose(fp);
 780         }
 781
 782         while (optind < argc)
 783                 do_host(argv[optind++]);
 784
 785         while (ncon > 0)
 786                 conloop();
 787
 788         return (0);
 789 }