[gssapi-openssh.git] / openssh / ssh-keyscan.c

/*
 * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
 *
 * Modification and redistribution in source and binary forms is
 * permitted provided that due credit is given to the author and the
 * OpenBSD project by leaving this copyright notice intact.
 */

#include "includes.h"
RCSID("$OpenBSD: ssh-keyscan.c,v 1.41 2003/02/16 17:09:57 markus Exp $");

#include "openbsd-compat/sys-queue.h"

#include <openssl/bn.h>

#include <setjmp.h>
#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
#include "key.h"
#include "kex.h"
#include "compat.h"
#include "myproposal.h"
#include "packet.h"
#include "dispatch.h"
#include "buffer.h"
#include "bufaux.h"
#include "log.h"
#include "atomicio.h"
#include "misc.h"

/* Flag indicating whether IPv4 or IPv6.  This can be set on the command line.
   Default value is AF_UNSPEC means both IPv4 and IPv6. */
#ifdef IPV4_DEFAULT
int IPv4or6 = AF_INET;
#else
int IPv4or6 = AF_UNSPEC;
#endif

int ssh_port = SSH_DEFAULT_PORT;

#define KT_RSA1	1
#define KT_DSA	2
#define KT_RSA	4

int get_keytypes = KT_RSA1;	/* Get only RSA1 keys by default */

#define MAXMAXFD 256

/* The number of seconds after which to give up on a TCP connection */
int timeout = 5;

int maxfd;
#define MAXCON (maxfd - 10)

#ifdef HAVE___PROGNAME
extern char *__progname;
#else
char *__progname;
#endif
fd_set *read_wait;
size_t read_wait_size;
int ncon;
int nonfatal_fatal = 0;
jmp_buf kexjmp;
Key *kexjmp_key;

/*
 * Keep a connection structure for each file descriptor.  The state
 * associated with file descriptor n is held in fdcon[n].
 */
typedef struct Connection {
	u_char c_status;	/* State of connection on this file desc. */
#define CS_UNUSED 0		/* File descriptor unused */
#define CS_CON 1		/* Waiting to connect/read greeting */
#define CS_SIZE 2		/* Waiting to read initial packet size */
#define CS_KEYS 3		/* Waiting to read public key packet */
	int c_fd;		/* Quick lookup: c->c_fd == c - fdcon */
	int c_plen;		/* Packet length field for ssh packet */
	int c_len;		/* Total bytes which must be read. */
	int c_off;		/* Length of data read so far. */
	int c_keytype;		/* Only one of KT_RSA1, KT_DSA, or KT_RSA */
	char *c_namebase;	/* Address to free for c_name and c_namelist */
	char *c_name;		/* Hostname of connection for errors */
	char *c_namelist;	/* Pointer to other possible addresses */
	char *c_output_name;	/* Hostname of connection for output */
	char *c_data;		/* Data read from this fd */
	Kex *c_kex;		/* The key-exchange struct for ssh2 */
	struct timeval c_tv;	/* Time at which connection gets aborted */
	TAILQ_ENTRY(Connection) c_link;	/* List of connections in timeout order. */
} con;

TAILQ_HEAD(conlist, Connection) tq;	/* Timeout Queue */
con *fdcon;

/*
 *  This is just a wrapper around fgets() to make it usable.
 */

/* Stress-test.  Increase this later. */
#define LINEBUF_SIZE 16

typedef struct {
	char *buf;
	u_int size;
	int lineno;
	const char *filename;
	FILE *stream;
	void (*errfun) (const char *,...);
} Linebuf;

static Linebuf *
Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
{
	Linebuf *lb;

	if (!(lb = malloc(sizeof(*lb)))) {
		if (errfun)
			(*errfun) ("linebuf (%s): malloc failed\n",
			    filename ? filename : "(stdin)");
		return (NULL);
	}
	if (filename) {
		lb->filename = filename;
		if (!(lb->stream = fopen(filename, "r"))) {
			xfree(lb);
			if (errfun)
				(*errfun) ("%s: %s\n", filename, strerror(errno));
			return (NULL);
		}
	} else {
		lb->filename = "(stdin)";
		lb->stream = stdin;
	}

	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
		if (errfun)
			(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
		xfree(lb);
		return (NULL);
	}
	lb->errfun = errfun;
	lb->lineno = 0;
	return (lb);
}

static void
Linebuf_free(Linebuf * lb)
{
	fclose(lb->stream);
	xfree(lb->buf);
	xfree(lb);
}

#if 0
static void
Linebuf_restart(Linebuf * lb)
{
	clearerr(lb->stream);
	rewind(lb->stream);
	lb->lineno = 0;
}

static int
Linebuf_lineno(Linebuf * lb)
{
	return (lb->lineno);
}
#endif

static char *
Linebuf_getline(Linebuf * lb)
{
	int n = 0;
	void *p;

	lb->lineno++;
	for (;;) {
		/* Read a line */
		if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
			if (ferror(lb->stream) && lb->errfun)
				(*lb->errfun)("%s: %s\n", lb->filename,
				    strerror(errno));
			return (NULL);
		}
		n = strlen(lb->buf);

		/* Return it or an error if it fits */
		if (n > 0 && lb->buf[n - 1] == '\n') {
			lb->buf[n - 1] = '\0';
			return (lb->buf);
		}
		if (n != lb->size - 1) {
			if (lb->errfun)
				(*lb->errfun)("%s: skipping incomplete last line\n",
				    lb->filename);
			return (NULL);
		}
		/* Double the buffer if we need more space */
		lb->size *= 2;
		if ((p = realloc(lb->buf, lb->size)) == NULL) {
			lb->size /= 2;
			if (lb->errfun)
				(*lb->errfun)("linebuf (%s): realloc failed\n",
				    lb->filename);
			return (NULL);
		}
		lb->buf = p;
	}
}

static int
fdlim_get(int hard)
{
#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
	struct rlimit rlfd;

	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
		return (-1);
	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
		return 10000;
	else
		return hard ? rlfd.rlim_max : rlfd.rlim_cur;
#elif defined (HAVE_SYSCONF)
	return sysconf (_SC_OPEN_MAX);
#else
	return 10000;
#endif
}

static int
fdlim_set(int lim)
{
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	struct rlimit rlfd;
#endif

	if (lim <= 0)
		return (-1);
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
		return (-1);
	rlfd.rlim_cur = lim;
	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
		return (-1);
#elif defined (HAVE_SETDTABLESIZE)
	setdtablesize(lim);
#endif
	return (0);
}

/*
 * This is an strsep function that returns a null field for adjacent
 * separators.  This is the same as the 4.4BSD strsep, but different from the
 * one in the GNU libc.
 */
static char *
xstrsep(char **str, const char *delim)
{
	char *s, *e;

	if (!**str)
		return (NULL);

	s = *str;
	e = s + strcspn(s, delim);

	if (*e != '\0')
		*e++ = '\0';
	*str = e;

	return (s);
}

/*
 * Get the next non-null token (like GNU strsep).  Strsep() will return a
 * null token for two adjacent separators, so we may have to loop.
 */
static char *
strnnsep(char **stringp, char *delim)
{
	char *tok;

	do {
		tok = xstrsep(stringp, delim);
	} while (tok && *tok == '\0');
	return (tok);
}

static Key *
keygrab_ssh1(con *c)
{
	static Key *rsa;
	static Buffer msg;

	if (rsa == NULL) {
		buffer_init(&msg);
		rsa = key_new(KEY_RSA1);
	}
	buffer_append(&msg, c->c_data, c->c_plen);
	buffer_consume(&msg, 8 - (c->c_plen & 7));	/* padding */
	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
		error("%s: invalid packet type", c->c_name);
		buffer_clear(&msg);
		return NULL;
	}
	buffer_consume(&msg, 8);		/* cookie */

	/* server key */
	(void) buffer_get_int(&msg);
	buffer_get_bignum(&msg, rsa->rsa->e);
	buffer_get_bignum(&msg, rsa->rsa->n);

	/* host key */
	(void) buffer_get_int(&msg);
	buffer_get_bignum(&msg, rsa->rsa->e);
	buffer_get_bignum(&msg, rsa->rsa->n);

	buffer_clear(&msg);

	return (rsa);
}

static int
hostjump(Key *hostkey)
{
	kexjmp_key = hostkey;
	longjmp(kexjmp, 1);
}

static int
ssh2_capable(int remote_major, int remote_minor)
{
	switch (remote_major) {
	case 1:
		if (remote_minor == 99)
			return 1;
		break;
	case 2:
		return 1;
	default:
		break;
	}
	return 0;
}

static Key *
keygrab_ssh2(con *c)
{
	int j;

	packet_set_connection(c->c_fd, c->c_fd);
	enable_compat20();
	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
	    "ssh-dss": "ssh-rsa";
	c->c_kex = kex_setup(myproposal);
	c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
	c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
	c->c_kex->verify_host_key = hostjump;

	if (!(j = setjmp(kexjmp))) {
		nonfatal_fatal = 1;
		dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
		fprintf(stderr, "Impossible! dispatch_run() returned!\n");
		exit(1);
	}
	nonfatal_fatal = 0;
	xfree(c->c_kex);
	c->c_kex = NULL;
	packet_close();

	return j < 0? NULL : kexjmp_key;
}

static void
keyprint(con *c, Key *key)
{
	if (!key)
		return;

	fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
	key_write(key, stdout);
	fputs("\n", stdout);
}

static int
tcpconnect(char *host)
{
	struct addrinfo hints, *ai, *aitop;
	char strport[NI_MAXSERV];
	int gaierr, s = -1;

	snprintf(strport, sizeof strport, "%d", ssh_port);
	memset(&hints, 0, sizeof(hints));
	hints.ai_family = IPv4or6;
	hints.ai_socktype = SOCK_STREAM;
	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
		fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	for (ai = aitop; ai; ai = ai->ai_next) {
		s = socket(ai->ai_family, SOCK_STREAM, 0);
		if (s < 0) {
			error("socket: %s", strerror(errno));
			continue;
		}
		if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
			fatal("F_SETFL: %s", strerror(errno));
		if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
		    errno != EINPROGRESS)
			error("connect (`%s'): %s", host, strerror(errno));
		else
			break;
		close(s);
		s = -1;
	}
	freeaddrinfo(aitop);
	return s;
}

static int
conalloc(char *iname, char *oname, int keytype)
{
	char *namebase, *name, *namelist;
	int s;

	namebase = namelist = xstrdup(iname);

	do {
		name = xstrsep(&namelist, ",");
		if (!name) {
			xfree(namebase);
			return (-1);
		}
	} while ((s = tcpconnect(name)) < 0);

	if (s >= maxfd)
		fatal("conalloc: fdno %d too high", s);
	if (fdcon[s].c_status)
		fatal("conalloc: attempt to reuse fdno %d", s);

	fdcon[s].c_fd = s;
	fdcon[s].c_status = CS_CON;
	fdcon[s].c_namebase = namebase;
	fdcon[s].c_name = name;
	fdcon[s].c_namelist = namelist;
	fdcon[s].c_output_name = xstrdup(oname);
	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	fdcon[s].c_len = 4;
	fdcon[s].c_off = 0;
	fdcon[s].c_keytype = keytype;
	gettimeofday(&fdcon[s].c_tv, NULL);
	fdcon[s].c_tv.tv_sec += timeout;
	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	FD_SET(s, read_wait);
	ncon++;
	return (s);
}

static void
confree(int s)
{
	if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
		fatal("confree: attempt to free bad fdno %d", s);
	close(s);
	xfree(fdcon[s].c_namebase);
	xfree(fdcon[s].c_output_name);
	if (fdcon[s].c_status == CS_KEYS)
		xfree(fdcon[s].c_data);
	fdcon[s].c_status = CS_UNUSED;
	fdcon[s].c_keytype = 0;
	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	FD_CLR(s, read_wait);
	ncon--;
}

static void
contouch(int s)
{
	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	gettimeofday(&fdcon[s].c_tv, NULL);
	fdcon[s].c_tv.tv_sec += timeout;
	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
}

static int
conrecycle(int s)
{
	con *c = &fdcon[s];
	int ret;

	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	confree(s);
	return (ret);
}

static void
congreet(int s)
{
	int remote_major, remote_minor, n = 0;
	char buf[256], *cp;
	char remote_version[sizeof buf];
	size_t bufsiz;
	con *c = &fdcon[s];

	bufsiz = sizeof(buf);
	cp = buf;
	while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
		if (*cp == '\r')
			*cp = '\n';
		cp++;
	}
	if (n < 0) {
		if (errno != ECONNREFUSED)
			error("read (%s): %s", c->c_name, strerror(errno));
		conrecycle(s);
		return;
	}
	if (n == 0) {
		error("%s: Connection closed by remote host", c->c_name);
		conrecycle(s);
		return;
	}
	if (*cp != '\n' && *cp != '\r') {
		error("%s: bad greeting", c->c_name);
		confree(s);
		return;
	}
	*cp = '\0';
	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	    &remote_major, &remote_minor, remote_version) == 3)
		compat_datafellows(remote_version);
	else
		datafellows = 0;
	if (c->c_keytype != KT_RSA1) {
		if (!ssh2_capable(remote_major, remote_minor)) {
			debug("%s doesn't support ssh2", c->c_name);
			confree(s);
			return;
		}
	} else if (remote_major != 1) {
		debug("%s doesn't support ssh1", c->c_name);
		confree(s);
		return;
	}
	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	    c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	    c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
	if (atomicio(write, s, buf, n) != n) {
		error("write (%s): %s", c->c_name, strerror(errno));
		confree(s);
		return;
	}
	if (c->c_keytype != KT_RSA1) {
		keyprint(c, keygrab_ssh2(c));
		confree(s);
		return;
	}
	c->c_status = CS_SIZE;
	contouch(s);
}

static void
conread(int s)
{
	con *c = &fdcon[s];
	int n;

	if (c->c_status == CS_CON) {
		congreet(s);
		return;
	}
	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
	if (n < 0) {
		error("read (%s): %s", c->c_name, strerror(errno));
		confree(s);
		return;
	}
	c->c_off += n;

	if (c->c_off == c->c_len)
		switch (c->c_status) {
		case CS_SIZE:
			c->c_plen = htonl(c->c_plen);
			c->c_len = c->c_plen + 8 - (c->c_plen & 7);
			c->c_off = 0;
			c->c_data = xmalloc(c->c_len);
			c->c_status = CS_KEYS;
			break;
		case CS_KEYS:
			keyprint(c, keygrab_ssh1(c));
			confree(s);
			return;
			break;
		default:
			fatal("conread: invalid status %d", c->c_status);
			break;
		}

	contouch(s);
}

static void
conloop(void)
{
	struct timeval seltime, now;
	fd_set *r, *e;
	con *c;
	int i;

	gettimeofday(&now, NULL);
	c = TAILQ_FIRST(&tq);

	if (c && (c->c_tv.tv_sec > now.tv_sec ||
	    (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
		seltime = c->c_tv;
		seltime.tv_sec -= now.tv_sec;
		seltime.tv_usec -= now.tv_usec;
		if (seltime.tv_usec < 0) {
			seltime.tv_usec += 1000000;
			seltime.tv_sec--;
		}
	} else
		seltime.tv_sec = seltime.tv_usec = 0;

	r = xmalloc(read_wait_size);
	memcpy(r, read_wait, read_wait_size);
	e = xmalloc(read_wait_size);
	memcpy(e, read_wait, read_wait_size);

	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	    (errno == EAGAIN || errno == EINTR))
		;

	for (i = 0; i < maxfd; i++) {
		if (FD_ISSET(i, e)) {
			error("%s: exception!", fdcon[i].c_name);
			confree(i);
		} else if (FD_ISSET(i, r))
			conread(i);
	}
	xfree(r);
	xfree(e);

	c = TAILQ_FIRST(&tq);
	while (c && (c->c_tv.tv_sec < now.tv_sec ||
	    (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
		int s = c->c_fd;

		c = TAILQ_NEXT(c, c_link);
		conrecycle(s);
	}
}

static void
do_host(char *host)
{
	char *name = strnnsep(&host, " \t\n");
	int j;

	if (name == NULL)
		return;
	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
		if (get_keytypes & j) {
			while (ncon >= MAXCON)
				conloop();
			conalloc(name, *host ? host : name, j);
		}
	}
}

void
fatal(const char *fmt,...)
{
	va_list args;

	va_start(args, fmt);
	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	va_end(args);
	if (nonfatal_fatal)
		longjmp(kexjmp, -1);
	else
		fatal_cleanup();
}

static void
usage(void)
{
	fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-f file]\n"
	    "\t\t   [host | addrlist namelist] [...]\n",
	    __progname);
	exit(1);
}

int
main(int argc, char **argv)
{
	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	int opt, fopt_count = 0;
	char *tname;

	extern int optind;
	extern char *optarg;

	__progname = get_progname(argv[0]);
	init_rng();
	seed_rng();
	TAILQ_INIT(&tq);

	if (argc <= 1)
		usage();

	while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
		switch (opt) {
		case 'p':
			ssh_port = a2port(optarg);
			if (ssh_port == 0) {
				fprintf(stderr, "Bad port '%s'\n", optarg);
				exit(1);
			}
			break;
		case 'T':
			timeout = convtime(optarg);
			if (timeout == -1 || timeout == 0) {
				fprintf(stderr, "Bad timeout '%s'\n", optarg);
				usage();
			}
			break;
		case 'v':
			if (!debug_flag) {
				debug_flag = 1;
				log_level = SYSLOG_LEVEL_DEBUG1;
			}
			else if (log_level < SYSLOG_LEVEL_DEBUG3)
				log_level++;
			else
				fatal("Too high debugging level.");
			break;
		case 'f':
			if (strcmp(optarg, "-") == 0)
				optarg = NULL;
			argv[fopt_count++] = optarg;
			break;
		case 't':
			get_keytypes = 0;
			tname = strtok(optarg, ",");
			while (tname) {
				int type = key_type_from_name(tname);
				switch (type) {
				case KEY_RSA1:
					get_keytypes |= KT_RSA1;
					break;
				case KEY_DSA:
					get_keytypes |= KT_DSA;
					break;
				case KEY_RSA:
					get_keytypes |= KT_RSA;
					break;
				case KEY_UNSPEC:
					fatal("unknown key type %s", tname);
				}
				tname = strtok(NULL, ",");
			}
			break;
		case '4':
			IPv4or6 = AF_INET;
			break;
		case '6':
			IPv4or6 = AF_INET6;
			break;
		case '?':
		default:
			usage();
		}
	}
	if (optind == argc && !fopt_count)
		usage();

	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);

	maxfd = fdlim_get(1);
	if (maxfd < 0)
		fatal("%s: fdlim_get: bad value", __progname);
	if (maxfd > MAXMAXFD)
		maxfd = MAXMAXFD;
	if (MAXCON <= 0)
		fatal("%s: not enough file descriptors", __progname);
	if (maxfd > fdlim_get(0))
		fdlim_set(maxfd);
	fdcon = xmalloc(maxfd * sizeof(con));
	memset(fdcon, 0, maxfd * sizeof(con));

	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	read_wait = xmalloc(read_wait_size);
	memset(read_wait, 0, read_wait_size);

	if (fopt_count) {
		Linebuf *lb;
		char *line;
		int j;

		for (j = 0; j < fopt_count; j++) {
			lb = Linebuf_alloc(argv[j], error);
			if (!lb)
				continue;
			while ((line = Linebuf_getline(lb)) != NULL)
				do_host(line);
			Linebuf_free(lb);
		}
	}

	while (optind < argc)
		do_host(argv[optind++]);

	while (ncon > 0)
		conloop();

	return (0);
}
Commit	Line	Data
3c0ef626	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"
6a9b3198	10	RCSID("$OpenBSD: ssh-keyscan.c,v 1.41 2003/02/16 17:09:57 markus Exp $");
3c0ef626	11
41b2f314	12	#include "openbsd-compat/sys-queue.h"
3c0ef626	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
	32	/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
	33	Default value is AF_UNSPEC means both IPv4 and IPv6. */
	34	#ifdef IPV4_DEFAULT
	35	int IPv4or6 = AF_INET;
	36	#else
	37	int IPv4or6 = AF_UNSPEC;
	38	#endif
	39
	40	int ssh_port = SSH_DEFAULT_PORT;
	41
	42	#define KT_RSA1 1
	43	#define KT_DSA 2
	44	#define KT_RSA 4
	45
	46	int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
	47
	48	#define MAXMAXFD 256
	49
	50	/* The number of seconds after which to give up on a TCP connection */
	51	int timeout = 5;
	52
	53	int maxfd;
	54	#define MAXCON (maxfd - 10)
	55
	56	#ifdef HAVE___PROGNAME
	57	extern char *__progname;
	58	#else
	59	char *__progname;
	60	#endif
	61	fd_set *read_wait;
	62	size_t read_wait_size;
	63	int ncon;
	64	int nonfatal_fatal = 0;
	65	jmp_buf kexjmp;
	66	Key *kexjmp_key;
	67
	68	/*
	69	* Keep a connection structure for each file descriptor. The state
	70	* associated with file descriptor n is held in fdcon[n].
	71	*/
	72	typedef struct Connection {
	73	u_char c_status; /* State of connection on this file desc. */
	74	#define CS_UNUSED 0 /* File descriptor unused */
	75	#define CS_CON 1 /* Waiting to connect/read greeting */
	76	#define CS_SIZE 2 /* Waiting to read initial packet size */
77	#define CS_KEYS 3 /* Waiting to read public key packet */
78	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
79	int c_plen; /* Packet length field for ssh packet */
80	int c_len; /* Total bytes which must be read. */
81	int c_off; /* Length of data read so far. */
82	int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
83	char c_namebase; / Address to free for c_name and c_namelist */
84	char c_name; / Hostname of connection for errors */
85	char c_namelist; / Pointer to other possible addresses */
86	char c_output_name; / Hostname of connection for output */
87	char c_data; / Data read from this fd */
88	Kex c_kex; / The key-exchange struct for ssh2 */
89	struct timeval c_tv; /* Time at which connection gets aborted */
90	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
91	} con;
92
93	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
94	con *fdcon;
95
96	/*
97	* This is just a wrapper around fgets() to make it usable.
98	*/
99
100	/* Stress-test. Increase this later. */
101	#define LINEBUF_SIZE 16
102
103	typedef struct {
104	char *buf;
105	u_int size;
106	int lineno;
107	const char *filename;
108	FILE *stream;
109	void (errfun) (const char ,...);
110	} Linebuf;
111
112	static Linebuf *
113	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
114	{
115	Linebuf *lb;
116
117	if (!(lb = malloc(sizeof(*lb)))) {
118	if (errfun)
41b2f314	119	(*errfun) ("linebuf (%s): malloc failed\n",
41b2f314	120	filename ? filename : "(stdin)");
3c0ef626	121	return (NULL);
	122	}
	123	if (filename) {
	124	lb->filename = filename;
	125	if (!(lb->stream = fopen(filename, "r"))) {
	126	xfree(lb);
	127	if (errfun)
	128	(*errfun) ("%s: %s\n", filename, strerror(errno));
	129	return (NULL);
	130	}
	131	} else {
	132	lb->filename = "(stdin)";
	133	lb->stream = stdin;
	134	}
	135
	136	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
	137	if (errfun)
	138	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
	139	xfree(lb);
	140	return (NULL);
	141	}
	142	lb->errfun = errfun;
	143	lb->lineno = 0;
	144	return (lb);
	145	}
	146
	147	static void
	148	Linebuf_free(Linebuf * lb)
	149	{
	150	fclose(lb->stream);
	151	xfree(lb->buf);
	152	xfree(lb);
	153	}
	154
	155	#if 0
	156	static void
	157	Linebuf_restart(Linebuf * lb)
	158	{
	159	clearerr(lb->stream);
	160	rewind(lb->stream);
	161	lb->lineno = 0;
	162	}
	163
	164	static int
	165	Linebuf_lineno(Linebuf * lb)
	166	{
	167	return (lb->lineno);
	168	}
	169	#endif
	170
	171	static char *
	172	Linebuf_getline(Linebuf * lb)
	173	{
	174	int n = 0;
41b2f314	175	void *p;
3c0ef626	176
	177	lb->lineno++;
	178	for (;;) {
	179	/* Read a line */
	180	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
	181	if (ferror(lb->stream) && lb->errfun)
41b2f314	182	(*lb->errfun)("%s: %s\n", lb->filename,
3c0ef626	183	strerror(errno));
	184	return (NULL);
	185	}
	186	n = strlen(lb->buf);
	187
	188	/* Return it or an error if it fits */
	189	if (n > 0 && lb->buf[n - 1] == '\n') {
	190	lb->buf[n - 1] = '\0';
	191	return (lb->buf);
	192	}
	193	if (n != lb->size - 1) {
	194	if (lb->errfun)
41b2f314	195	(*lb->errfun)("%s: skipping incomplete last line\n",
3c0ef626	196	lb->filename);
	197	return (NULL);
	198	}
	199	/* Double the buffer if we need more space */
41b2f314	200	lb->size *= 2;
	201	if ((p = realloc(lb->buf, lb->size)) == NULL) {
	202	lb->size /= 2;
3c0ef626	203	if (lb->errfun)
41b2f314	204	(*lb->errfun)("linebuf (%s): realloc failed\n",
3c0ef626	205	lb->filename);
	206	return (NULL);
	207	}
41b2f314	208	lb->buf = p;
3c0ef626	209	}
	210	}
	211
	212	static int
	213	fdlim_get(int hard)
	214	{
	215	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
	216	struct rlimit rlfd;
	217
	218	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	219	return (-1);
	220	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
	221	return 10000;
	222	else
	223	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
	224	#elif defined (HAVE_SYSCONF)
	225	return sysconf (_SC_OPEN_MAX);
	226	#else
	227	return 10000;
	228	#endif
	229	}
	230
	231	static int
	232	fdlim_set(int lim)
	233	{
	234	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	235	struct rlimit rlfd;
	236	#endif
41b2f314	237
3c0ef626	238	if (lim <= 0)
	239	return (-1);
	240	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	241	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	242	return (-1);
	243	rlfd.rlim_cur = lim;
	244	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	245	return (-1);
	246	#elif defined (HAVE_SETDTABLESIZE)
	247	setdtablesize(lim);
	248	#endif
	249	return (0);
	250	}
	251
	252	/*
	253	* This is an strsep function that returns a null field for adjacent
	254	* separators. This is the same as the 4.4BSD strsep, but different from the
	255	* one in the GNU libc.
	256	*/
	257	static char *
	258	xstrsep(char *str, const char delim)
	259	{
	260	char s, e;
	261
	262	if (!**str)
	263	return (NULL);
	264
	265	s = *str;
	266	e = s + strcspn(s, delim);
	267
	268	if (*e != '\0')
	269	*e++ = '\0';
	270	*str = e;
	271
	272	return (s);
	273	}
	274
	275	/*
	276	* Get the next non-null token (like GNU strsep). Strsep() will return a
	277	* null token for two adjacent separators, so we may have to loop.
	278	*/
	279	static char *
	280	strnnsep(char *stringp, char delim)
	281	{
	282	char *tok;
	283
	284	do {
	285	tok = xstrsep(stringp, delim);
	286	} while (tok && *tok == '\0');
	287	return (tok);
	288	}
	289
	290	static Key *
	291	keygrab_ssh1(con *c)
	292	{
	293	static Key *rsa;
	294	static Buffer msg;
	295
	296	if (rsa == NULL) {
	297	buffer_init(&msg);
	298	rsa = key_new(KEY_RSA1);
	299	}
	300	buffer_append(&msg, c->c_data, c->c_plen);
	301	buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
302	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
303	error("%s: invalid packet type", c->c_name);
304	buffer_clear(&msg);
305	return NULL;
306	}
307	buffer_consume(&msg, 8); /* cookie */
308
309	/* server key */
310	(void) buffer_get_int(&msg);
311	buffer_get_bignum(&msg, rsa->rsa->e);
312	buffer_get_bignum(&msg, rsa->rsa->n);
313
314	/* host 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	buffer_clear(&msg);
320
321	return (rsa);
322	}
323
324	static int
325	hostjump(Key *hostkey)
326	{
327	kexjmp_key = hostkey;
328	longjmp(kexjmp, 1);
329	}
330
331	static int
332	ssh2_capable(int remote_major, int remote_minor)
333	{
334	switch (remote_major) {
335	case 1:
336	if (remote_minor == 99)
337	return 1;
338	break;
339	case 2:
340	return 1;
341	default:
342	break;
343	}
344	return 0;
345	}
346
347	static Key *
348	keygrab_ssh2(con *c)
349	{
350	int j;
351
352	packet_set_connection(c->c_fd, c->c_fd);
353	enable_compat20();
354	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
355	"ssh-dss": "ssh-rsa";
356	c->c_kex = kex_setup(myproposal);
6a9b3198	357	c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
6a9b3198	358	c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
3c0ef626	359	c->c_kex->verify_host_key = hostjump;
	360
	361	if (!(j = setjmp(kexjmp))) {
	362	nonfatal_fatal = 1;
	363	dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
	364	fprintf(stderr, "Impossible! dispatch_run() returned!\n");
	365	exit(1);
	366	}
	367	nonfatal_fatal = 0;
	368	xfree(c->c_kex);
	369	c->c_kex = NULL;
	370	packet_close();
	371
	372	return j < 0? NULL : kexjmp_key;
	373	}
	374
	375	static void
	376	keyprint(con c, Key key)
	377	{
	378	if (!key)
	379	return;
	380
	381	fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
	382	key_write(key, stdout);
	383	fputs("\n", stdout);
	384	}
	385
	386	static int
	387	tcpconnect(char *host)
	388	{
	389	struct addrinfo hints, ai, aitop;
	390	char strport[NI_MAXSERV];
	391	int gaierr, s = -1;
	392
	393	snprintf(strport, sizeof strport, "%d", ssh_port);
	394	memset(&hints, 0, sizeof(hints));
	395	hints.ai_family = IPv4or6;
	396	hints.ai_socktype = SOCK_STREAM;
	397	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
	398	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	399	for (ai = aitop; ai; ai = ai->ai_next) {
	400	s = socket(ai->ai_family, SOCK_STREAM, 0);
	401	if (s < 0) {
	402	error("socket: %s", strerror(errno));
	403	continue;
	404	}
	405	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
	406	fatal("F_SETFL: %s", strerror(errno));
	407	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
	408	errno != EINPROGRESS)
	409	error("connect (`%s'): %s", host, strerror(errno));
	410	else
	411	break;
	412	close(s);
	413	s = -1;
	414	}
	415	freeaddrinfo(aitop);
	416	return s;
	417	}
	418
	419	static int
	420	conalloc(char iname, char oname, int keytype)
	421	{
3c0ef626	422	char namebase, name, *namelist;
41b2f314	423	int s;
3c0ef626	424
	425	namebase = namelist = xstrdup(iname);
	426
	427	do {
	428	name = xstrsep(&namelist, ",");
	429	if (!name) {
	430	xfree(namebase);
	431	return (-1);
	432	}
	433	} while ((s = tcpconnect(name)) < 0);
	434
	435	if (s >= maxfd)
	436	fatal("conalloc: fdno %d too high", s);
	437	if (fdcon[s].c_status)
	438	fatal("conalloc: attempt to reuse fdno %d", s);
	439
	440	fdcon[s].c_fd = s;
	441	fdcon[s].c_status = CS_CON;
	442	fdcon[s].c_namebase = namebase;
	443	fdcon[s].c_name = name;
	444	fdcon[s].c_namelist = namelist;
	445	fdcon[s].c_output_name = xstrdup(oname);
	446	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	447	fdcon[s].c_len = 4;
	448	fdcon[s].c_off = 0;
	449	fdcon[s].c_keytype = keytype;
	450	gettimeofday(&fdcon[s].c_tv, NULL);
	451	fdcon[s].c_tv.tv_sec += timeout;
	452	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	453	FD_SET(s, read_wait);
	454	ncon++;
	455	return (s);
	456	}
	457
	458	static void
	459	confree(int s)
	460	{
	461	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
	462	fatal("confree: attempt to free bad fdno %d", s);
	463	close(s);
	464	xfree(fdcon[s].c_namebase);
	465	xfree(fdcon[s].c_output_name);
	466	if (fdcon[s].c_status == CS_KEYS)
	467	xfree(fdcon[s].c_data);
	468	fdcon[s].c_status = CS_UNUSED;
	469	fdcon[s].c_keytype = 0;
	470	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	471	FD_CLR(s, read_wait);
	472	ncon--;
	473	}
	474
	475	static void
	476	contouch(int s)
	477	{
	478	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	479	gettimeofday(&fdcon[s].c_tv, NULL);
	480	fdcon[s].c_tv.tv_sec += timeout;
	481	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	482	}
	483
	484	static int
	485	conrecycle(int s)
	486	{
3c0ef626	487	con *c = &fdcon[s];
41b2f314	488	int ret;
3c0ef626	489
	490	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	491	confree(s);
	492	return (ret);
	493	}
	494
	495	static void
	496	congreet(int s)
	497	{
41b2f314	498	int remote_major, remote_minor, n = 0;
3c0ef626	499	char buf[256], *cp;
e9a17296	500	char remote_version[sizeof buf];
3c0ef626	501	size_t bufsiz;
3c0ef626	502	con *c = &fdcon[s];
	503
	504	bufsiz = sizeof(buf);
	505	cp = buf;
	506	while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
	507	if (*cp == '\r')
	508	*cp = '\n';
	509	cp++;
	510	}
	511	if (n < 0) {
	512	if (errno != ECONNREFUSED)
	513	error("read (%s): %s", c->c_name, strerror(errno));
	514	conrecycle(s);
	515	return;
	516	}
e9a17296	517	if (n == 0) {
	518	error("%s: Connection closed by remote host", c->c_name);
	519	conrecycle(s);
	520	return;
	521	}
3c0ef626	522	if (cp != '\n' && cp != '\r') {
	523	error("%s: bad greeting", c->c_name);
	524	confree(s);
	525	return;
	526	}
	527	*cp = '\0';
e9a17296	528	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	529	&remote_major, &remote_minor, remote_version) == 3)
	530	compat_datafellows(remote_version);
	531	else
	532	datafellows = 0;
3c0ef626	533	if (c->c_keytype != KT_RSA1) {
3c0ef626	534	if (!ssh2_capable(remote_major, remote_minor)) {
	535	debug("%s doesn't support ssh2", c->c_name);
	536	confree(s);
	537	return;
	538	}
e9a17296	539	} else if (remote_major != 1) {
	540	debug("%s doesn't support ssh1", c->c_name);
	541	confree(s);
	542	return;
3c0ef626	543	}
	544	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	545	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	546	c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	547	c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
	548	if (atomicio(write, s, buf, n) != n) {
	549	error("write (%s): %s", c->c_name, strerror(errno));
	550	confree(s);
	551	return;
	552	}
	553	if (c->c_keytype != KT_RSA1) {
	554	keyprint(c, keygrab_ssh2(c));
	555	confree(s);
	556	return;
	557	}
	558	c->c_status = CS_SIZE;
	559	contouch(s);
	560	}
	561
	562	static void
	563	conread(int s)
	564	{
3c0ef626	565	con *c = &fdcon[s];
41b2f314	566	int n;
3c0ef626	567
	568	if (c->c_status == CS_CON) {
	569	congreet(s);
	570	return;
	571	}
	572	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
	573	if (n < 0) {
	574	error("read (%s): %s", c->c_name, strerror(errno));
	575	confree(s);
	576	return;
	577	}
	578	c->c_off += n;
	579
	580	if (c->c_off == c->c_len)
	581	switch (c->c_status) {
	582	case CS_SIZE:
	583	c->c_plen = htonl(c->c_plen);
	584	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	585	c->c_off = 0;
	586	c->c_data = xmalloc(c->c_len);
	587	c->c_status = CS_KEYS;
	588	break;
	589	case CS_KEYS:
	590	keyprint(c, keygrab_ssh1(c));
	591	confree(s);
	592	return;
	593	break;
	594	default:
	595	fatal("conread: invalid status %d", c->c_status);
	596	break;
	597	}
	598
	599	contouch(s);
	600	}
	601
	602	static void
	603	conloop(void)
	604	{
3c0ef626	605	struct timeval seltime, now;
41b2f314	606	fd_set r, e;
3c0ef626	607	con *c;
41b2f314	608	int i;
3c0ef626	609
3c0ef626	610	gettimeofday(&now, NULL);
f5799ae1	611	c = TAILQ_FIRST(&tq);
3c0ef626	612
	613	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
	614	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	615	seltime = c->c_tv;
	616	seltime.tv_sec -= now.tv_sec;
	617	seltime.tv_usec -= now.tv_usec;
	618	if (seltime.tv_usec < 0) {
	619	seltime.tv_usec += 1000000;
	620	seltime.tv_sec--;
	621	}
	622	} else
	623	seltime.tv_sec = seltime.tv_usec = 0;
	624
	625	r = xmalloc(read_wait_size);
	626	memcpy(r, read_wait, read_wait_size);
	627	e = xmalloc(read_wait_size);
	628	memcpy(e, read_wait, read_wait_size);
	629
	630	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	631	(errno == EAGAIN \|\| errno == EINTR))
	632	;
	633
	634	for (i = 0; i < maxfd; i++) {
	635	if (FD_ISSET(i, e)) {
	636	error("%s: exception!", fdcon[i].c_name);
	637	confree(i);
	638	} else if (FD_ISSET(i, r))
	639	conread(i);
	640	}
	641	xfree(r);
	642	xfree(e);
	643
f5799ae1	644	c = TAILQ_FIRST(&tq);
3c0ef626	645	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
	646	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	647	int s = c->c_fd;
	648
f5799ae1	649	c = TAILQ_NEXT(c, c_link);
3c0ef626	650	conrecycle(s);
	651	}
	652	}
	653
	654	static void
	655	do_host(char *host)
	656	{
	657	char *name = strnnsep(&host, " \t\n");
	658	int j;
	659
e9a17296	660	if (name == NULL)
e9a17296	661	return;
3c0ef626	662	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
	663	if (get_keytypes & j) {
	664	while (ncon >= MAXCON)
	665	conloop();
	666	conalloc(name, *host ? host : name, j);
	667	}
	668	}
	669	}
	670
e9a17296	671	void
e9a17296	672	fatal(const char *fmt,...)
3c0ef626	673	{
e9a17296	674	va_list args;
41b2f314	675
e9a17296	676	va_start(args, fmt);
	677	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	678	va_end(args);
3c0ef626	679	if (nonfatal_fatal)
3c0ef626	680	longjmp(kexjmp, -1);
e9a17296	681	else
e9a17296	682	fatal_cleanup();
3c0ef626	683	}
	684
	685	static void
	686	usage(void)
	687	{
41b2f314	688	fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-f file]\n"
41b2f314	689	"\t\t [host \| addrlist namelist] [...]\n",
3c0ef626	690	__progname);
3c0ef626	691	exit(1);
	692	}
	693
	694	int
	695	main(int argc, char **argv)
	696	{
	697	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	698	int opt, fopt_count = 0;
	699	char *tname;
	700
	701	extern int optind;
	702	extern char *optarg;
	703
	704	__progname = get_progname(argv[0]);
	705	init_rng();
	706	seed_rng();
	707	TAILQ_INIT(&tq);
	708
	709	if (argc <= 1)
	710	usage();
	711
	712	while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
	713	switch (opt) {
	714	case 'p':
	715	ssh_port = a2port(optarg);
	716	if (ssh_port == 0) {
	717	fprintf(stderr, "Bad port '%s'\n", optarg);
	718	exit(1);
	719	}
	720	break;
	721	case 'T':
41b2f314	722	timeout = convtime(optarg);
	723	if (timeout == -1 \|\| timeout == 0) {
	724	fprintf(stderr, "Bad timeout '%s'\n", optarg);
3c0ef626	725	usage();
41b2f314	726	}
3c0ef626	727	break;
	728	case 'v':
	729	if (!debug_flag) {
	730	debug_flag = 1;
	731	log_level = SYSLOG_LEVEL_DEBUG1;
	732	}
	733	else if (log_level < SYSLOG_LEVEL_DEBUG3)
	734	log_level++;
	735	else
	736	fatal("Too high debugging level.");
	737	break;
	738	case 'f':
	739	if (strcmp(optarg, "-") == 0)
	740	optarg = NULL;
	741	argv[fopt_count++] = optarg;
	742	break;
	743	case 't':
	744	get_keytypes = 0;
	745	tname = strtok(optarg, ",");
	746	while (tname) {
	747	int type = key_type_from_name(tname);
	748	switch (type) {
	749	case KEY_RSA1:
	750	get_keytypes \|= KT_RSA1;
	751	break;
	752	case KEY_DSA:
	753	get_keytypes \|= KT_DSA;
	754	break;
	755	case KEY_RSA:
	756	get_keytypes \|= KT_RSA;
	757	break;
	758	case KEY_UNSPEC:
e9a17296	759	fatal("unknown key type %s", tname);
3c0ef626	760	}
	761	tname = strtok(NULL, ",");
	762	}
	763	break;
	764	case '4':
	765	IPv4or6 = AF_INET;
	766	break;
	767	case '6':
	768	IPv4or6 = AF_INET6;
	769	break;
	770	case '?':
	771	default:
	772	usage();
	773	}
	774	}
	775	if (optind == argc && !fopt_count)
	776	usage();
	777
	778	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
3c0ef626	779
	780	maxfd = fdlim_get(1);
	781	if (maxfd < 0)
	782	fatal("%s: fdlim_get: bad value", __progname);
	783	if (maxfd > MAXMAXFD)
	784	maxfd = MAXMAXFD;
	785	if (MAXCON <= 0)
	786	fatal("%s: not enough file descriptors", __progname);
	787	if (maxfd > fdlim_get(0))
	788	fdlim_set(maxfd);
	789	fdcon = xmalloc(maxfd * sizeof(con));
	790	memset(fdcon, 0, maxfd * sizeof(con));
	791
	792	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	793	read_wait = xmalloc(read_wait_size);
	794	memset(read_wait, 0, read_wait_size);
	795
	796	if (fopt_count) {
	797	Linebuf *lb;
	798	char *line;
	799	int j;
	800
	801	for (j = 0; j < fopt_count; j++) {
	802	lb = Linebuf_alloc(argv[j], error);
	803	if (!lb)
	804	continue;
	805	while ((line = Linebuf_getline(lb)) != NULL)
	806	do_host(line);
	807	Linebuf_free(lb);
	808	}
	809	}
	810
	811	while (optind < argc)
	812	do_host(argv[optind++]);
	813
	814	while (ncon > 0)
	815	conloop();
	816
	817	return (0);
	818	}