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      1 /*
      2  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
      3  * Use is subject to license terms.
      4  */
      5 /*
      6  * Copyright 1995, 1996 by David Mazieres <dm (at) lcs.mit.edu>.
      7  *
      8  * Modification and redistribution in source and binary forms is
      9  * permitted provided that due credit is given to the author and the
     10  * OpenBSD project by leaving this copyright notice intact.
     11  */
     12 
     13 #include "includes.h"
     14 RCSID("$OpenBSD: ssh-keyscan.c,v 1.40 2002/07/06 17:47:58 stevesk Exp $");
     15 
     16 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     17 
     18 #include "sys-queue.h"
     19 
     20 #include <openssl/bn.h>
     21 
     22 #include <setjmp.h>
     23 #include "xmalloc.h"
     24 #include "ssh.h"
     25 #include "ssh1.h"
     26 #include "key.h"
     27 #include "kex.h"
     28 #include "compat.h"
     29 #include "myproposal.h"
     30 #include "packet.h"
     31 #include "dispatch.h"
     32 #include "buffer.h"
     33 #include "bufaux.h"
     34 #include "log.h"
     35 #include "atomicio.h"
     36 #include "misc.h"
     37 
     38 /* Flag indicating whether IPv4 or IPv6.  This can be set on the command line.
     39    Default value is AF_UNSPEC means both IPv4 and IPv6. */
     40 #ifdef IPV4_DEFAULT
     41 int IPv4or6 = AF_INET;
     42 #else
     43 int IPv4or6 = AF_UNSPEC;
     44 #endif
     45 
     46 int ssh_port = SSH_DEFAULT_PORT;
     47 
     48 #define KT_RSA1	1
     49 #define KT_DSA	2
     50 #define KT_RSA	4
     51 
     52 int get_keytypes = KT_RSA1;	/* Get only RSA1 keys by default */
     53 
     54 #define MAXMAXFD 256
     55 
     56 /* The number of seconds after which to give up on a TCP connection */
     57 int timeout = 5;
     58 
     59 int maxfd;
     60 #define MAXCON (maxfd - 10)
     61 
     62 #ifdef HAVE___PROGNAME
     63 extern char *__progname;
     64 #else
     65 char *__progname;
     66 #endif
     67 fd_set *read_wait;
     68 size_t read_wait_size;
     69 int ncon;
     70 int nonfatal_fatal = 0;
     71 jmp_buf kexjmp;
     72 Key *kexjmp_key;
     73 
     74 /*
     75  * Keep a connection structure for each file descriptor.  The state
     76  * associated with file descriptor n is held in fdcon[n].
     77  */
     78 typedef struct Connection {
     79 	u_char c_status;	/* State of connection on this file desc. */
     80 #define CS_UNUSED 0		/* File descriptor unused */
     81 #define CS_CON 1		/* Waiting to connect/read greeting */
     82 #define CS_SIZE 2		/* Waiting to read initial packet size */
     83 #define CS_KEYS 3		/* Waiting to read public key packet */
     84 	int c_fd;		/* Quick lookup: c->c_fd == c - fdcon */
     85 	int c_plen;		/* Packet length field for ssh packet */
     86 	int c_len;		/* Total bytes which must be read. */
     87 	int c_off;		/* Length of data read so far. */
     88 	int c_keytype;		/* Only one of KT_RSA1, KT_DSA, or KT_RSA */
     89 	char *c_namebase;	/* Address to free for c_name and c_namelist */
     90 	char *c_name;		/* Hostname of connection for errors */
     91 	char *c_namelist;	/* Pointer to other possible addresses */
     92 	char *c_output_name;	/* Hostname of connection for output */
     93 	char *c_data;		/* Data read from this fd */
     94 	Kex *c_kex;		/* The key-exchange struct for ssh2 */
     95 	struct timeval c_tv;	/* Time at which connection gets aborted */
     96 	TAILQ_ENTRY(Connection) c_link;	/* List of connections in timeout order. */
     97 } con;
     98 
     99 TAILQ_HEAD(conlist, Connection) tq;	/* Timeout Queue */
    100 con *fdcon;
    101 
    102 /*
    103  *  This is just a wrapper around fgets() to make it usable.
    104  */
    105 
    106 /* Stress-test.  Increase this later. */
    107 #define LINEBUF_SIZE 16
    108 
    109 typedef struct {
    110 	char *buf;
    111 	u_int size;
    112 	int lineno;
    113 	const char *filename;
    114 	FILE *stream;
    115 	void (*errfun) (const char *,...);
    116 } Linebuf;
    117 
    118 static Linebuf *
    119 Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
    120 {
    121 	Linebuf *lb;
    122 
    123 	if (!(lb = malloc(sizeof(*lb)))) {
    124 		if (errfun)
    125 			(*errfun) ("linebuf (%s): malloc failed\n",
    126 			    filename ? filename : "(stdin)");
    127 		return (NULL);
    128 	}
    129 	if (filename) {
    130 		lb->filename = filename;
    131 		if (!(lb->stream = fopen(filename, "r"))) {
    132 			xfree(lb);
    133 			if (errfun)
    134 				(*errfun) ("%s: %s\n", filename, strerror(errno));
    135 			return (NULL);
    136 		}
    137 	} else {
    138 		lb->filename = "(stdin)";
    139 		lb->stream = stdin;
    140 	}
    141 
    142 	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
    143 		if (errfun)
    144 			(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
    145 		xfree(lb);
    146 		return (NULL);
    147 	}
    148 	lb->errfun = errfun;
    149 	lb->lineno = 0;
    150 	return (lb);
    151 }
    152 
    153 static void
    154 Linebuf_free(Linebuf * lb)
    155 {
    156 	fclose(lb->stream);
    157 	xfree(lb->buf);
    158 	xfree(lb);
    159 }
    160 
    161 #if 0
    162 static void
    163 Linebuf_restart(Linebuf * lb)
    164 {
    165 	clearerr(lb->stream);
    166 	rewind(lb->stream);
    167 	lb->lineno = 0;
    168 }
    169 
    170 static int
    171 Linebuf_lineno(Linebuf * lb)
    172 {
    173 	return (lb->lineno);
    174 }
    175 #endif
    176 
    177 static char *
    178 Linebuf_getline(Linebuf * lb)
    179 {
    180 	int n = 0;
    181 	void *p;
    182 
    183 	lb->lineno++;
    184 	for (;;) {
    185 		/* Read a line */
    186 		if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
    187 			if (ferror(lb->stream) && lb->errfun)
    188 				(*lb->errfun)("%s: %s\n", lb->filename,
    189 				    strerror(errno));
    190 			return (NULL);
    191 		}
    192 		n = strlen(lb->buf);
    193 
    194 		/* Return it or an error if it fits */
    195 		if (n > 0 && lb->buf[n - 1] == '\n') {
    196 			lb->buf[n - 1] = '\0';
    197 			return (lb->buf);
    198 		}
    199 		if (n != lb->size - 1) {
    200 			if (lb->errfun)
    201 				(*lb->errfun)("%s: skipping incomplete last line\n",
    202 				    lb->filename);
    203 			return (NULL);
    204 		}
    205 		/* Double the buffer if we need more space */
    206 		lb->size *= 2;
    207 		if ((p = realloc(lb->buf, lb->size)) == NULL) {
    208 			lb->size /= 2;
    209 			if (lb->errfun)
    210 				(*lb->errfun)("linebuf (%s): realloc failed\n",
    211 				    lb->filename);
    212 			return (NULL);
    213 		}
    214 		lb->buf = p;
    215 	}
    216 }
    217 
    218 static int
    219 fdlim_get(int hard)
    220 {
    221 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
    222 	struct rlimit rlfd;
    223 
    224 	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
    225 		return (-1);
    226 	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
    227 		return 10000;
    228 	else
    229 		return hard ? rlfd.rlim_max : rlfd.rlim_cur;
    230 #elif defined (HAVE_SYSCONF)
    231 	return sysconf (_SC_OPEN_MAX);
    232 #else
    233 	return 10000;
    234 #endif
    235 }
    236 
    237 static int
    238 fdlim_set(int lim)
    239 {
    240 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
    241 	struct rlimit rlfd;
    242 #endif
    243 
    244 	if (lim <= 0)
    245 		return (-1);
    246 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
    247 	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
    248 		return (-1);
    249 	rlfd.rlim_cur = lim;
    250 	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
    251 		return (-1);
    252 #elif defined (HAVE_SETDTABLESIZE)
    253 	setdtablesize(lim);
    254 #endif
    255 	return (0);
    256 }
    257 
    258 /*
    259  * This is an strsep function that returns a null field for adjacent
    260  * separators.  This is the same as the 4.4BSD strsep, but different from the
    261  * one in the GNU libc.
    262  */
    263 static char *
    264 xstrsep(char **str, const char *delim)
    265 {
    266 	char *s, *e;
    267 
    268 	if (!**str)
    269 		return (NULL);
    270 
    271 	s = *str;
    272 	e = s + strcspn(s, delim);
    273 
    274 	if (*e != '\0')
    275 		*e++ = '\0';
    276 	*str = e;
    277 
    278 	return (s);
    279 }
    280 
    281 /*
    282  * Get the next non-null token (like GNU strsep).  Strsep() will return a
    283  * null token for two adjacent separators, so we may have to loop.
    284  */
    285 static char *
    286 strnnsep(char **stringp, char *delim)
    287 {
    288 	char *tok;
    289 
    290 	do {
    291 		tok = xstrsep(stringp, delim);
    292 	} while (tok && *tok == '\0');
    293 	return (tok);
    294 }
    295 
    296 static Key *
    297 keygrab_ssh1(con *c)
    298 {
    299 	static Key *rsa;
    300 	static Buffer msg;
    301 
    302 	if (rsa == NULL) {
    303 		buffer_init(&msg);
    304 		rsa = key_new(KEY_RSA1);
    305 	}
    306 	buffer_append(&msg, c->c_data, c->c_plen);
    307 	buffer_consume(&msg, 8 - (c->c_plen & 7));	/* padding */
    308 	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
    309 		error("%s: invalid packet type", c->c_name);
    310 		buffer_clear(&msg);
    311 		return NULL;
    312 	}
    313 	buffer_consume(&msg, 8);		/* cookie */
    314 
    315 	/* server key */
    316 	(void) buffer_get_int(&msg);
    317 	buffer_get_bignum(&msg, rsa->rsa->e);
    318 	buffer_get_bignum(&msg, rsa->rsa->n);
    319 
    320 	/* host key */
    321 	(void) buffer_get_int(&msg);
    322 	buffer_get_bignum(&msg, rsa->rsa->e);
    323 	buffer_get_bignum(&msg, rsa->rsa->n);
    324 
    325 	buffer_clear(&msg);
    326 
    327 	return (rsa);
    328 }
    329 
    330 static int
    331 hostjump(Key *hostkey)
    332 {
    333 	kexjmp_key = hostkey;
    334 	longjmp(kexjmp, 1);
    335 	/* NOTREACHED */
    336 	return (0);
    337 }
    338 
    339 static int
    340 ssh2_capable(int remote_major, int remote_minor)
    341 {
    342 	switch (remote_major) {
    343 	case 1:
    344 		if (remote_minor == 99)
    345 			return 1;
    346 		break;
    347 	case 2:
    348 		return 1;
    349 	default:
    350 		break;
    351 	}
    352 	return 0;
    353 }
    354 
    355 static Key *
    356 keygrab_ssh2(con *c)
    357 {
    358 	int j;
    359 
    360 	packet_set_connection(c->c_fd, c->c_fd);
    361 	enable_compat20();
    362 	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
    363 	    "ssh-dss": "ssh-rsa";
    364 	c->c_kex = kex_setup(c->c_name, myproposal, NULL);
    365 	c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
    366 	c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
    367 	c->c_kex->verify_host_key = hostjump;
    368 
    369 	if (!(j = setjmp(kexjmp))) {
    370 		nonfatal_fatal = 1;
    371 		dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
    372 		fprintf(stderr, "Impossible! dispatch_run() returned!\n");
    373 		exit(1);
    374 	}
    375 	nonfatal_fatal = 0;
    376 	xfree(c->c_kex);
    377 	c->c_kex = NULL;
    378 	packet_close();
    379 
    380 	return j < 0? NULL : kexjmp_key;
    381 }
    382 
    383 static void
    384 keyprint(con *c, Key *key)
    385 {
    386 	if (!key)
    387 		return;
    388 
    389 	fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
    390 	key_write(key, stdout);
    391 	fputs("\n", stdout);
    392 }
    393 
    394 static int
    395 tcpconnect(char *host)
    396 {
    397 	struct addrinfo hints, *ai, *aitop;
    398 	char strport[NI_MAXSERV];
    399 	int gaierr, s = -1;
    400 
    401 	snprintf(strport, sizeof strport, "%d", ssh_port);
    402 	memset(&hints, 0, sizeof(hints));
    403 	hints.ai_family = IPv4or6;
    404 	hints.ai_socktype = SOCK_STREAM;
    405 	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
    406 		fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
    407 	for (ai = aitop; ai; ai = ai->ai_next) {
    408 		s = socket(ai->ai_family, SOCK_STREAM, 0);
    409 		if (s < 0) {
    410 			error("socket: %s", strerror(errno));
    411 			continue;
    412 		}
    413 		if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
    414 			fatal("F_SETFL: %s", strerror(errno));
    415 		if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
    416 		    errno != EINPROGRESS)
    417 			error("connect (`%s'): %s", host, strerror(errno));
    418 		else
    419 			break;
    420 		close(s);
    421 		s = -1;
    422 	}
    423 	freeaddrinfo(aitop);
    424 	return s;
    425 }
    426 
    427 static int
    428 conalloc(char *iname, char *oname, int keytype)
    429 {
    430 	char *namebase, *name, *namelist;
    431 	int s;
    432 
    433 	namebase = namelist = xstrdup(iname);
    434 
    435 	do {
    436 		name = xstrsep(&namelist, ",");
    437 		if (!name) {
    438 			xfree(namebase);
    439 			return (-1);
    440 		}
    441 	} while ((s = tcpconnect(name)) < 0);
    442 
    443 	if (s >= maxfd)
    444 		fatal("conalloc: fdno %d too high", s);
    445 	if (fdcon[s].c_status)
    446 		fatal("conalloc: attempt to reuse fdno %d", s);
    447 
    448 	fdcon[s].c_fd = s;
    449 	fdcon[s].c_status = CS_CON;
    450 	fdcon[s].c_namebase = namebase;
    451 	fdcon[s].c_name = name;
    452 	fdcon[s].c_namelist = namelist;
    453 	fdcon[s].c_output_name = xstrdup(oname);
    454 	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
    455 	fdcon[s].c_len = 4;
    456 	fdcon[s].c_off = 0;
    457 	fdcon[s].c_keytype = keytype;
    458 	gettimeofday(&fdcon[s].c_tv, NULL);
    459 	fdcon[s].c_tv.tv_sec += timeout;
    460 	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
    461 	FD_SET(s, read_wait);
    462 	ncon++;
    463 	return (s);
    464 }
    465 
    466 static void
    467 confree(int s)
    468 {
    469 	if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
    470 		fatal("confree: attempt to free bad fdno %d", s);
    471 	close(s);
    472 	xfree(fdcon[s].c_namebase);
    473 	xfree(fdcon[s].c_output_name);
    474 	if (fdcon[s].c_status == CS_KEYS)
    475 		xfree(fdcon[s].c_data);
    476 	fdcon[s].c_status = CS_UNUSED;
    477 	fdcon[s].c_keytype = 0;
    478 	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
    479 	FD_CLR(s, read_wait);
    480 	ncon--;
    481 }
    482 
    483 static void
    484 contouch(int s)
    485 {
    486 	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
    487 	gettimeofday(&fdcon[s].c_tv, NULL);
    488 	fdcon[s].c_tv.tv_sec += timeout;
    489 	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
    490 }
    491 
    492 static int
    493 conrecycle(int s)
    494 {
    495 	con *c = &fdcon[s];
    496 	int ret;
    497 
    498 	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
    499 	confree(s);
    500 	return (ret);
    501 }
    502 
    503 static void
    504 congreet(int s)
    505 {
    506 	int remote_major, remote_minor, n = 0;
    507 	char buf[256], *cp;
    508 	char remote_version[sizeof buf];
    509 	size_t bufsiz;
    510 	con *c = &fdcon[s];
    511 
    512 	bufsiz = sizeof(buf);
    513 	cp = buf;
    514 	while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
    515 		if (*cp == '\r')
    516 			*cp = '\n';
    517 		cp++;
    518 	}
    519 	if (n < 0) {
    520 		if (errno != ECONNREFUSED)
    521 			error("read (%s): %s", c->c_name, strerror(errno));
    522 		conrecycle(s);
    523 		return;
    524 	}
    525 	if (n == 0) {
    526 		error("%s: Connection closed by remote host", c->c_name);
    527 		conrecycle(s);
    528 		return;
    529 	}
    530 	if (*cp != '\n' && *cp != '\r') {
    531 		error("%s: bad greeting", c->c_name);
    532 		confree(s);
    533 		return;
    534 	}
    535 	*cp = '\0';
    536 	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
    537 	    &remote_major, &remote_minor, remote_version) == 3)
    538 		compat_datafellows(remote_version);
    539 	else
    540 		datafellows = 0;
    541 	if (c->c_keytype != KT_RSA1) {
    542 		if (!ssh2_capable(remote_major, remote_minor)) {
    543 			debug("%s doesn't support ssh2", c->c_name);
    544 			confree(s);
    545 			return;
    546 		}
    547 	} else if (remote_major != 1) {
    548 		debug("%s doesn't support ssh1", c->c_name);
    549 		confree(s);
    550 		return;
    551 	}
    552 	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
    553 	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
    554 	    c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
    555 	    c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
    556 	if (atomicio(write, s, buf, n) != n) {
    557 		error("write (%s): %s", c->c_name, strerror(errno));
    558 		confree(s);
    559 		return;
    560 	}
    561 	if (c->c_keytype != KT_RSA1) {
    562 		keyprint(c, keygrab_ssh2(c));
    563 		confree(s);
    564 		return;
    565 	}
    566 	c->c_status = CS_SIZE;
    567 	contouch(s);
    568 }
    569 
    570 static void
    571 conread(int s)
    572 {
    573 	con *c = &fdcon[s];
    574 	int n;
    575 
    576 	if (c->c_status == CS_CON) {
    577 		congreet(s);
    578 		return;
    579 	}
    580 	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
    581 	if (n < 0) {
    582 		error("read (%s): %s", c->c_name, strerror(errno));
    583 		confree(s);
    584 		return;
    585 	}
    586 	c->c_off += n;
    587 
    588 	if (c->c_off == c->c_len)
    589 		switch (c->c_status) {
    590 		case CS_SIZE:
    591 			c->c_plen = htonl(c->c_plen);
    592 			c->c_len = c->c_plen + 8 - (c->c_plen & 7);
    593 			c->c_off = 0;
    594 			c->c_data = xmalloc(c->c_len);
    595 			c->c_status = CS_KEYS;
    596 			break;
    597 		case CS_KEYS:
    598 			keyprint(c, keygrab_ssh1(c));
    599 			confree(s);
    600 			return;
    601 			break;
    602 		default:
    603 			fatal("conread: invalid status %d", c->c_status);
    604 			break;
    605 		}
    606 
    607 	contouch(s);
    608 }
    609 
    610 static void
    611 conloop(void)
    612 {
    613 	struct timeval seltime, now;
    614 	fd_set *r, *e;
    615 	con *c;
    616 	int i;
    617 
    618 	gettimeofday(&now, NULL);
    619 	c = TAILQ_FIRST(&tq);
    620 
    621 	if (c && (c->c_tv.tv_sec > now.tv_sec ||
    622 	    (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
    623 		seltime = c->c_tv;
    624 		seltime.tv_sec -= now.tv_sec;
    625 		seltime.tv_usec -= now.tv_usec;
    626 		if (seltime.tv_usec < 0) {
    627 			seltime.tv_usec += 1000000;
    628 			seltime.tv_sec--;
    629 		}
    630 	} else
    631 		seltime.tv_sec = seltime.tv_usec = 0;
    632 
    633 	r = xmalloc(read_wait_size);
    634 	memcpy(r, read_wait, read_wait_size);
    635 	e = xmalloc(read_wait_size);
    636 	memcpy(e, read_wait, read_wait_size);
    637 
    638 	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
    639 	    (errno == EAGAIN || errno == EINTR))
    640 		;
    641 
    642 	for (i = 0; i < maxfd; i++) {
    643 		if (FD_ISSET(i, e)) {
    644 			error("%s: exception!", fdcon[i].c_name);
    645 			confree(i);
    646 		} else if (FD_ISSET(i, r))
    647 			conread(i);
    648 	}
    649 	xfree(r);
    650 	xfree(e);
    651 
    652 	c = TAILQ_FIRST(&tq);
    653 	while (c && (c->c_tv.tv_sec < now.tv_sec ||
    654 	    (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
    655 		int s = c->c_fd;
    656 
    657 		c = TAILQ_NEXT(c, c_link);
    658 		conrecycle(s);
    659 	}
    660 }
    661 
    662 static void
    663 do_host(char *host)
    664 {
    665 	char *name = strnnsep(&host, " \t\n");
    666 	int j;
    667 
    668 	if (name == NULL)
    669 		return;
    670 	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
    671 		if (get_keytypes & j) {
    672 			while (ncon >= MAXCON)
    673 				conloop();
    674 			conalloc(name, *host ? host : name, j);
    675 		}
    676 	}
    677 }
    678 
    679 void
    680 fatal(const char *fmt,...)
    681 {
    682 	va_list args;
    683 
    684 	va_start(args, fmt);
    685 	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
    686 	va_end(args);
    687 	if (nonfatal_fatal)
    688 		longjmp(kexjmp, -1);
    689 	else
    690 		fatal_cleanup();
    691 }
    692 
    693 static void
    694 usage(void)
    695 {
    696 	fprintf(stderr,
    697 		gettext("Usage: %s [-v46] [-p port] [-T timeout] [-f file]\n"
    698 			"\t\t   [host | addrlist namelist] [...]\n"),
    699 	    __progname);
    700 	exit(1);
    701 }
    702 
    703 int
    704 main(int argc, char **argv)
    705 {
    706 	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
    707 	int opt, fopt_count = 0;
    708 	char *tname;
    709 
    710 	extern int optind;
    711 	extern char *optarg;
    712 
    713 	__progname = get_progname(argv[0]);
    714 
    715 	(void) g11n_setlocale(LC_ALL, "");
    716 
    717 	init_rng();
    718 	seed_rng();
    719 	TAILQ_INIT(&tq);
    720 
    721 	if (argc <= 1)
    722 		usage();
    723 
    724 	while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
    725 		switch (opt) {
    726 		case 'p':
    727 			ssh_port = a2port(optarg);
    728 			if (ssh_port == 0) {
    729 				fprintf(stderr, gettext("Bad port '%s'\n"),
    730 					optarg);
    731 				exit(1);
    732 			}
    733 			break;
    734 		case 'T':
    735 			timeout = convtime(optarg);
    736 			if (timeout == -1 || timeout == 0) {
    737 				fprintf(stderr, gettext("Bad timeout '%s'\n"),
    738 					optarg);
    739 				usage();
    740 			}
    741 			break;
    742 		case 'v':
    743 			if (!debug_flag) {
    744 				debug_flag = 1;
    745 				log_level = SYSLOG_LEVEL_DEBUG1;
    746 			}
    747 			else if (log_level < SYSLOG_LEVEL_DEBUG3)
    748 				log_level++;
    749 			else
    750 				fatal("Too high debugging level.");
    751 			break;
    752 		case 'f':
    753 			if (strcmp(optarg, "-") == 0)
    754 				optarg = NULL;
    755 			argv[fopt_count++] = optarg;
    756 			break;
    757 		case 't':
    758 			get_keytypes = 0;
    759 			tname = strtok(optarg, ",");
    760 			while (tname) {
    761 				int type = key_type_from_name(tname);
    762 				switch (type) {
    763 				case KEY_RSA1:
    764 					get_keytypes |= KT_RSA1;
    765 					break;
    766 				case KEY_DSA:
    767 					get_keytypes |= KT_DSA;
    768 					break;
    769 				case KEY_RSA:
    770 					get_keytypes |= KT_RSA;
    771 					break;
    772 				case KEY_UNSPEC:
    773 					fatal("unknown key type %s", tname);
    774 				}
    775 				tname = strtok(NULL, ",");
    776 			}
    777 			break;
    778 		case '4':
    779 			IPv4or6 = AF_INET;
    780 			break;
    781 		case '6':
    782 			IPv4or6 = AF_INET6;
    783 			break;
    784 		case '?':
    785 		default:
    786 			usage();
    787 		}
    788 	}
    789 	if (optind == argc && !fopt_count)
    790 		usage();
    791 
    792 	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
    793 
    794 	maxfd = fdlim_get(1);
    795 	if (maxfd < 0)
    796 		fatal("%s: fdlim_get: bad value", __progname);
    797 	if (maxfd > MAXMAXFD)
    798 		maxfd = MAXMAXFD;
    799 	if (MAXCON <= 0)
    800 		fatal("%s: not enough file descriptors", __progname);
    801 	if (maxfd > fdlim_get(0))
    802 		fdlim_set(maxfd);
    803 	fdcon = xmalloc(maxfd * sizeof(con));
    804 	memset(fdcon, 0, maxfd * sizeof(con));
    805 
    806 	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
    807 	read_wait = xmalloc(read_wait_size);
    808 	memset(read_wait, 0, read_wait_size);
    809 
    810 	if (fopt_count) {
    811 		Linebuf *lb;
    812 		char *line;
    813 		int j;
    814 
    815 		for (j = 0; j < fopt_count; j++) {
    816 			lb = Linebuf_alloc(argv[j], error);
    817 			if (!lb)
    818 				continue;
    819 			while ((line = Linebuf_getline(lb)) != NULL)
    820 				do_host(line);
    821 			Linebuf_free(lb);
    822 		}
    823 	}
    824 
    825 	while (optind < argc)
    826 		do_host(argv[optind++]);
    827 
    828 	while (ncon > 0)
    829 		conloop();
    830 
    831 	return (0);
    832 }
    833