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      1 /*
      2  * Copyright 1995, 1996 by David Mazieres <dm (at) 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 /*
     10  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
     11  * Use is subject to license terms.
     12  */
     13 
     14 #include "includes.h"
     15 RCSID("$OpenBSD: ssh-keyscan.c,v 1.40 2002/07/06 17:47:58 stevesk Exp $");
     16 
     17 #include "sys-queue.h"
     18 
     19 #include <openssl/bn.h>
     20 
     21 #include <setjmp.h>
     22 #include "xmalloc.h"
     23 #include "ssh.h"
     24 #include "ssh1.h"
     25 #include "key.h"
     26 #include "kex.h"
     27 #include "compat.h"
     28 #include "myproposal.h"
     29 #include "packet.h"
     30 #include "dispatch.h"
     31 #include "buffer.h"
     32 #include "bufaux.h"
     33 #include "log.h"
     34 #include "atomicio.h"
     35 #include "misc.h"
     36 
     37 /* Flag indicating whether IPv4 or IPv6.  This can be set on the command line.
     38    Default value is AF_UNSPEC means both IPv4 and IPv6. */
     39 #ifdef IPV4_DEFAULT
     40 int IPv4or6 = AF_INET;
     41 #else
     42 int IPv4or6 = AF_UNSPEC;
     43 #endif
     44 
     45 int ssh_port = SSH_DEFAULT_PORT;
     46 
     47 #define KT_RSA1	1
     48 #define KT_DSA	2
     49 #define KT_RSA	4
     50 
     51 int get_keytypes = KT_RSA1;	/* Get only RSA1 keys by default */
     52 
     53 #define MAXMAXFD 256
     54 
     55 /* The number of seconds after which to give up on a TCP connection */
     56 int timeout = 5;
     57 
     58 int maxfd;
     59 #define MAXCON (maxfd - 10)
     60 
     61 #ifdef HAVE___PROGNAME
     62 extern char *__progname;
     63 #else
     64 char *__progname;
     65 #endif
     66 fd_set *read_wait;
     67 size_t read_wait_size;
     68 int ncon;
     69 int nonfatal_fatal = 0;
     70 jmp_buf kexjmp;
     71 Key *kexjmp_key;
     72 
     73 /*
     74  * Keep a connection structure for each file descriptor.  The state
     75  * associated with file descriptor n is held in fdcon[n].
     76  */
     77 typedef struct Connection {
     78 	u_char c_status;	/* State of connection on this file desc. */
     79 #define CS_UNUSED 0		/* File descriptor unused */
     80 #define CS_CON 1		/* Waiting to connect/read greeting */
     81 #define CS_SIZE 2		/* Waiting to read initial packet size */
     82 #define CS_KEYS 3		/* Waiting to read public key packet */
     83 	int c_fd;		/* Quick lookup: c->c_fd == c - fdcon */
     84 	int c_plen;		/* Packet length field for ssh packet */
     85 	int c_len;		/* Total bytes which must be read. */
     86 	int c_off;		/* Length of data read so far. */
     87 	int c_keytype;		/* Only one of KT_RSA1, KT_DSA, or KT_RSA */
     88 	char *c_namebase;	/* Address to free for c_name and c_namelist */
     89 	char *c_name;		/* Hostname of connection for errors */
     90 	char *c_namelist;	/* Pointer to other possible addresses */
     91 	char *c_output_name;	/* Hostname of connection for output */
     92 	char *c_data;		/* Data read from this fd */
     93 	Kex *c_kex;		/* The key-exchange struct for ssh2 */
     94 	struct timeval c_tv;	/* Time at which connection gets aborted */
     95 	TAILQ_ENTRY(Connection) c_link;	/* List of connections in timeout order. */
     96 } con;
     97 
     98 TAILQ_HEAD(conlist, Connection) tq;	/* Timeout Queue */
     99 con *fdcon;
    100 
    101 /*
    102  *  This is just a wrapper around fgets() to make it usable.
    103  */
    104 
    105 /* Stress-test.  Increase this later. */
    106 #define LINEBUF_SIZE 16
    107 
    108 typedef struct {
    109 	char *buf;
    110 	u_int size;
    111 	int lineno;
    112 	const char *filename;
    113 	FILE *stream;
    114 	void (*errfun) (const char *,...);
    115 } Linebuf;
    116 
    117 static Linebuf *
    118 Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
    119 {
    120 	Linebuf *lb;
    121 
    122 	if (!(lb = malloc(sizeof(*lb)))) {
    123 		if (errfun)
    124 			(*errfun) ("linebuf (%s): malloc failed\n",
    125 			    filename ? filename : "(stdin)");
    126 		return (NULL);
    127 	}
    128 	if (filename) {
    129 		lb->filename = filename;
    130 		if (!(lb->stream = fopen(filename, "r"))) {
    131 			xfree(lb);
    132 			if (errfun)
    133 				(*errfun) ("%s: %s\n", filename, strerror(errno));
    134 			return (NULL);
    135 		}
    136 	} else {
    137 		lb->filename = "(stdin)";
    138 		lb->stream = stdin;
    139 	}
    140 
    141 	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
    142 		if (errfun)
    143 			(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
    144 		xfree(lb);
    145 		return (NULL);
    146 	}
    147 	lb->errfun = errfun;
    148 	lb->lineno = 0;
    149 	return (lb);
    150 }
    151 
    152 static void
    153 Linebuf_free(Linebuf * lb)
    154 {
    155 	fclose(lb->stream);
    156 	xfree(lb->buf);
    157 	xfree(lb);
    158 }
    159 
    160 #if 0
    161 static void
    162 Linebuf_restart(Linebuf * lb)
    163 {
    164 	clearerr(lb->stream);
    165 	rewind(lb->stream);
    166 	lb->lineno = 0;
    167 }
    168 
    169 static int
    170 Linebuf_lineno(Linebuf * lb)
    171 {
    172 	return (lb->lineno);
    173 }
    174 #endif
    175 
    176 static char *
    177 Linebuf_getline(Linebuf * lb)
    178 {
    179 	int n = 0;
    180 	void *p;
    181 
    182 	lb->lineno++;
    183 	for (;;) {
    184 		/* Read a line */
    185 		if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
    186 			if (ferror(lb->stream) && lb->errfun)
    187 				(*lb->errfun)("%s: %s\n", lb->filename,
    188 				    strerror(errno));
    189 			return (NULL);
    190 		}
    191 		n = strlen(lb->buf);
    192 
    193 		/* Return it or an error if it fits */
    194 		if (n > 0 && lb->buf[n - 1] == '\n') {
    195 			lb->buf[n - 1] = '\0';
    196 			return (lb->buf);
    197 		}
    198 		if (n != lb->size - 1) {
    199 			if (lb->errfun)
    200 				(*lb->errfun)("%s: skipping incomplete last line\n",
    201 				    lb->filename);
    202 			return (NULL);
    203 		}
    204 		/* Double the buffer if we need more space */
    205 		lb->size *= 2;
    206 		if ((p = realloc(lb->buf, lb->size)) == NULL) {
    207 			lb->size /= 2;
    208 			if (lb->errfun)
    209 				(*lb->errfun)("linebuf (%s): realloc failed\n",
    210 				    lb->filename);
    211 			return (NULL);
    212 		}
    213 		lb->buf = p;
    214 	}
    215 }
    216 
    217 static int
    218 fdlim_get(int hard)
    219 {
    220 #if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
    221 	struct rlimit rlfd;
    222 
    223 	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
    224 		return (-1);
    225 	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
    226 		return 10000;
    227 	else
    228 		return hard ? rlfd.rlim_max : rlfd.rlim_cur;
    229 #elif defined (HAVE_SYSCONF)
    230 	return sysconf (_SC_OPEN_MAX);
    231 #else
    232 	return 10000;
    233 #endif
    234 }
    235 
    236 static int
    237 fdlim_set(int lim)
    238 {
    239 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
    240 	struct rlimit rlfd;
    241 #endif
    242 
    243 	if (lim <= 0)
    244 		return (-1);
    245 #if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
    246 	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
    247 		return (-1);
    248 	rlfd.rlim_cur = lim;
    249 	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
    250 		return (-1);
    251 #elif defined (HAVE_SETDTABLESIZE)
    252 	setdtablesize(lim);
    253 #endif
    254 	return (0);
    255 }
    256 
    257 /*
    258  * This is an strsep function that returns a null field for adjacent
    259  * separators.  This is the same as the 4.4BSD strsep, but different from the
    260  * one in the GNU libc.
    261  */
    262 static char *
    263 xstrsep(char **str, const char *delim)
    264 {
    265 	char *s, *e;
    266 
    267 	if (!**str)
    268 		return (NULL);
    269 
    270 	s = *str;
    271 	e = s + strcspn(s, delim);
    272 
    273 	if (*e != '\0')
    274 		*e++ = '\0';
    275 	*str = e;
    276 
    277 	return (s);
    278 }
    279 
    280 /*
    281  * Get the next non-null token (like GNU strsep).  Strsep() will return a
    282  * null token for two adjacent separators, so we may have to loop.
    283  */
    284 static char *
    285 strnnsep(char **stringp, char *delim)
    286 {
    287 	char *tok;
    288 
    289 	do {
    290 		tok = xstrsep(stringp, delim);
    291 	} while (tok && *tok == '\0');
    292 	return (tok);
    293 }
    294 
    295 static Key *
    296 keygrab_ssh1(con *c)
    297 {
    298 	static Key *rsa;
    299 	static Buffer msg;
    300 
    301 	if (rsa == NULL) {
    302 		buffer_init(&msg);
    303 		rsa = key_new(KEY_RSA1);
    304 	}
    305 	buffer_append(&msg, c->c_data, c->c_plen);
    306 	buffer_consume(&msg, 8 - (c->c_plen & 7));	/* padding */
    307 	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
    308 		error("%s: invalid packet type", c->c_name);
    309 		buffer_clear(&msg);
    310 		return NULL;
    311 	}
    312 	buffer_consume(&msg, 8);		/* cookie */
    313 
    314 	/* server key */
    315 	(void) buffer_get_int(&msg);
    316 	buffer_get_bignum(&msg, rsa->rsa->e);
    317 	buffer_get_bignum(&msg, rsa->rsa->n);
    318 
    319 	/* host key */
    320 	(void) buffer_get_int(&msg);
    321 	buffer_get_bignum(&msg, rsa->rsa->e);
    322 	buffer_get_bignum(&msg, rsa->rsa->n);
    323 
    324 	buffer_clear(&msg);
    325 
    326 	return (rsa);
    327 }
    328 
    329 static int
    330 hostjump(Key *hostkey)
    331 {
    332 	kexjmp_key = hostkey;
    333 	longjmp(kexjmp, 1);
    334 	/* NOTREACHED */
    335 	return (0);
    336 }
    337 
    338 static int
    339 ssh2_capable(int remote_major, int remote_minor)
    340 {
    341 	switch (remote_major) {
    342 	case 1:
    343 		if (remote_minor == 99)
    344 			return 1;
    345 		break;
    346 	case 2:
    347 		return 1;
    348 	default:
    349 		break;
    350 	}
    351 	return 0;
    352 }
    353 
    354 static Key *
    355 keygrab_ssh2(con *c)
    356 {
    357 	int j;
    358 
    359 	packet_set_connection(c->c_fd, c->c_fd);
    360 	enable_compat20();
    361 	my_clnt_proposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
    362 	    c->c_keytype == KT_DSA? "ssh-dss": "ssh-rsa";
    363 	c->c_kex = kex_setup(c->c_name, my_clnt_proposal, NULL);
    364 	kex_start(c->c_kex);
    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