[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 1.40 2002/07/06 17:47:58 stevesk 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->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"
41b2f314	10	RCSID("$OpenBSD: ssh-keyscan.c,v 1.40 2002/07/06 17:47:58 stevesk 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);
357	c->c_kex->verify_host_key = hostjump;
358
359	if (!(j = setjmp(kexjmp))) {
360	nonfatal_fatal = 1;
361	dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
362	fprintf(stderr, "Impossible! dispatch_run() returned!\n");
363	exit(1);
364	}
365	nonfatal_fatal = 0;
366	xfree(c->c_kex);
367	c->c_kex = NULL;
368	packet_close();
369
370	return j < 0? NULL : kexjmp_key;
371	}
372
373	static void
374	keyprint(con c, Key key)
375	{
376	if (!key)
377	return;
378
379	fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
380	key_write(key, stdout);
381	fputs("\n", stdout);
382	}
383
384	static int
385	tcpconnect(char *host)
386	{
387	struct addrinfo hints, ai, aitop;
388	char strport[NI_MAXSERV];
389	int gaierr, s = -1;
390
391	snprintf(strport, sizeof strport, "%d", ssh_port);
392	memset(&hints, 0, sizeof(hints));
393	hints.ai_family = IPv4or6;
394	hints.ai_socktype = SOCK_STREAM;
395	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
396	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
397	for (ai = aitop; ai; ai = ai->ai_next) {
398	s = socket(ai->ai_family, SOCK_STREAM, 0);
399	if (s < 0) {
400	error("socket: %s", strerror(errno));
401	continue;
402	}
403	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
404	fatal("F_SETFL: %s", strerror(errno));
405	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
406	errno != EINPROGRESS)
407	error("connect (`%s'): %s", host, strerror(errno));
408	else
409	break;
410	close(s);
411	s = -1;
412	}
413	freeaddrinfo(aitop);
414	return s;
415	}
416
417	static int
418	conalloc(char iname, char oname, int keytype)
419	{
3c0ef626	420	char namebase, name, *namelist;
41b2f314	421	int s;
3c0ef626	422
	423	namebase = namelist = xstrdup(iname);
	424
	425	do {
	426	name = xstrsep(&namelist, ",");
	427	if (!name) {
	428	xfree(namebase);
	429	return (-1);
	430	}
	431	} while ((s = tcpconnect(name)) < 0);
	432
	433	if (s >= maxfd)
	434	fatal("conalloc: fdno %d too high", s);
	435	if (fdcon[s].c_status)
	436	fatal("conalloc: attempt to reuse fdno %d", s);
	437
	438	fdcon[s].c_fd = s;
	439	fdcon[s].c_status = CS_CON;
	440	fdcon[s].c_namebase = namebase;
	441	fdcon[s].c_name = name;
	442	fdcon[s].c_namelist = namelist;
	443	fdcon[s].c_output_name = xstrdup(oname);
	444	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	445	fdcon[s].c_len = 4;
	446	fdcon[s].c_off = 0;
	447	fdcon[s].c_keytype = keytype;
	448	gettimeofday(&fdcon[s].c_tv, NULL);
	449	fdcon[s].c_tv.tv_sec += timeout;
	450	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	451	FD_SET(s, read_wait);
	452	ncon++;
	453	return (s);
	454	}
	455
	456	static void
	457	confree(int s)
	458	{
	459	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
	460	fatal("confree: attempt to free bad fdno %d", s);
	461	close(s);
	462	xfree(fdcon[s].c_namebase);
	463	xfree(fdcon[s].c_output_name);
	464	if (fdcon[s].c_status == CS_KEYS)
	465	xfree(fdcon[s].c_data);
	466	fdcon[s].c_status = CS_UNUSED;
	467	fdcon[s].c_keytype = 0;
	468	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	469	FD_CLR(s, read_wait);
	470	ncon--;
	471	}
	472
	473	static void
	474	contouch(int s)
	475	{
	476	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	477	gettimeofday(&fdcon[s].c_tv, NULL);
	478	fdcon[s].c_tv.tv_sec += timeout;
	479	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	480	}
	481
	482	static int
	483	conrecycle(int s)
	484	{
3c0ef626	485	con *c = &fdcon[s];
41b2f314	486	int ret;
3c0ef626	487
	488	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	489	confree(s);
	490	return (ret);
	491	}
	492
	493	static void
	494	congreet(int s)
	495	{
41b2f314	496	int remote_major, remote_minor, n = 0;
3c0ef626	497	char buf[256], *cp;
e9a17296	498	char remote_version[sizeof buf];
3c0ef626	499	size_t bufsiz;
3c0ef626	500	con *c = &fdcon[s];
	501
	502	bufsiz = sizeof(buf);
	503	cp = buf;
	504	while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
	505	if (*cp == '\r')
	506	*cp = '\n';
	507	cp++;
	508	}
	509	if (n < 0) {
	510	if (errno != ECONNREFUSED)
	511	error("read (%s): %s", c->c_name, strerror(errno));
	512	conrecycle(s);
	513	return;
	514	}
e9a17296	515	if (n == 0) {
	516	error("%s: Connection closed by remote host", c->c_name);
	517	conrecycle(s);
	518	return;
	519	}
3c0ef626	520	if (cp != '\n' && cp != '\r') {
	521	error("%s: bad greeting", c->c_name);
	522	confree(s);
	523	return;
	524	}
	525	*cp = '\0';
e9a17296	526	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	527	&remote_major, &remote_minor, remote_version) == 3)
	528	compat_datafellows(remote_version);
	529	else
	530	datafellows = 0;
3c0ef626	531	if (c->c_keytype != KT_RSA1) {
3c0ef626	532	if (!ssh2_capable(remote_major, remote_minor)) {
	533	debug("%s doesn't support ssh2", c->c_name);
	534	confree(s);
	535	return;
	536	}
e9a17296	537	} else if (remote_major != 1) {
	538	debug("%s doesn't support ssh1", c->c_name);
	539	confree(s);
	540	return;
3c0ef626	541	}
	542	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	543	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	544	c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	545	c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
	546	if (atomicio(write, s, buf, n) != n) {
	547	error("write (%s): %s", c->c_name, strerror(errno));
	548	confree(s);
	549	return;
	550	}
	551	if (c->c_keytype != KT_RSA1) {
	552	keyprint(c, keygrab_ssh2(c));
	553	confree(s);
	554	return;
	555	}
	556	c->c_status = CS_SIZE;
	557	contouch(s);
	558	}
	559
	560	static void
	561	conread(int s)
	562	{
3c0ef626	563	con *c = &fdcon[s];
41b2f314	564	int n;
3c0ef626	565
	566	if (c->c_status == CS_CON) {
	567	congreet(s);
	568	return;
	569	}
	570	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
	571	if (n < 0) {
	572	error("read (%s): %s", c->c_name, strerror(errno));
	573	confree(s);
	574	return;
	575	}
	576	c->c_off += n;
	577
	578	if (c->c_off == c->c_len)
	579	switch (c->c_status) {
	580	case CS_SIZE:
	581	c->c_plen = htonl(c->c_plen);
	582	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	583	c->c_off = 0;
	584	c->c_data = xmalloc(c->c_len);
	585	c->c_status = CS_KEYS;
	586	break;
	587	case CS_KEYS:
	588	keyprint(c, keygrab_ssh1(c));
	589	confree(s);
	590	return;
	591	break;
	592	default:
	593	fatal("conread: invalid status %d", c->c_status);
	594	break;
	595	}
	596
	597	contouch(s);
	598	}
	599
	600	static void
	601	conloop(void)
	602	{
3c0ef626	603	struct timeval seltime, now;
41b2f314	604	fd_set r, e;
3c0ef626	605	con *c;
41b2f314	606	int i;
3c0ef626	607
3c0ef626	608	gettimeofday(&now, NULL);
f5799ae1	609	c = TAILQ_FIRST(&tq);
3c0ef626	610
	611	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
	612	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	613	seltime = c->c_tv;
	614	seltime.tv_sec -= now.tv_sec;
	615	seltime.tv_usec -= now.tv_usec;
	616	if (seltime.tv_usec < 0) {
	617	seltime.tv_usec += 1000000;
	618	seltime.tv_sec--;
	619	}
	620	} else
	621	seltime.tv_sec = seltime.tv_usec = 0;
	622
	623	r = xmalloc(read_wait_size);
	624	memcpy(r, read_wait, read_wait_size);
	625	e = xmalloc(read_wait_size);
	626	memcpy(e, read_wait, read_wait_size);
	627
	628	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	629	(errno == EAGAIN \|\| errno == EINTR))
	630	;
	631
	632	for (i = 0; i < maxfd; i++) {
	633	if (FD_ISSET(i, e)) {
	634	error("%s: exception!", fdcon[i].c_name);
	635	confree(i);
	636	} else if (FD_ISSET(i, r))
	637	conread(i);
	638	}
	639	xfree(r);
	640	xfree(e);
	641
f5799ae1	642	c = TAILQ_FIRST(&tq);
3c0ef626	643	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
	644	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	645	int s = c->c_fd;
	646
f5799ae1	647	c = TAILQ_NEXT(c, c_link);
3c0ef626	648	conrecycle(s);
	649	}
	650	}
	651
	652	static void
	653	do_host(char *host)
	654	{
	655	char *name = strnnsep(&host, " \t\n");
	656	int j;
	657
e9a17296	658	if (name == NULL)
e9a17296	659	return;
3c0ef626	660	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
	661	if (get_keytypes & j) {
	662	while (ncon >= MAXCON)
	663	conloop();
	664	conalloc(name, *host ? host : name, j);
	665	}
	666	}
	667	}
	668
e9a17296	669	void
e9a17296	670	fatal(const char *fmt,...)
3c0ef626	671	{
e9a17296	672	va_list args;
41b2f314	673
e9a17296	674	va_start(args, fmt);
	675	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	676	va_end(args);
3c0ef626	677	if (nonfatal_fatal)
3c0ef626	678	longjmp(kexjmp, -1);
e9a17296	679	else
e9a17296	680	fatal_cleanup();
3c0ef626	681	}
	682
	683	static void
	684	usage(void)
	685	{
41b2f314	686	fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-f file]\n"
41b2f314	687	"\t\t [host \| addrlist namelist] [...]\n",
3c0ef626	688	__progname);
3c0ef626	689	exit(1);
	690	}
	691
	692	int
	693	main(int argc, char **argv)
	694	{
	695	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	696	int opt, fopt_count = 0;
	697	char *tname;
	698
	699	extern int optind;
	700	extern char *optarg;
	701
	702	__progname = get_progname(argv[0]);
	703	init_rng();
	704	seed_rng();
	705	TAILQ_INIT(&tq);
	706
	707	if (argc <= 1)
	708	usage();
	709
	710	while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
	711	switch (opt) {
	712	case 'p':
	713	ssh_port = a2port(optarg);
	714	if (ssh_port == 0) {
	715	fprintf(stderr, "Bad port '%s'\n", optarg);
	716	exit(1);
	717	}
	718	break;
	719	case 'T':
41b2f314	720	timeout = convtime(optarg);
	721	if (timeout == -1 \|\| timeout == 0) {
	722	fprintf(stderr, "Bad timeout '%s'\n", optarg);
3c0ef626	723	usage();
41b2f314	724	}
3c0ef626	725	break;
	726	case 'v':
	727	if (!debug_flag) {
	728	debug_flag = 1;
	729	log_level = SYSLOG_LEVEL_DEBUG1;
	730	}
	731	else if (log_level < SYSLOG_LEVEL_DEBUG3)
	732	log_level++;
	733	else
	734	fatal("Too high debugging level.");
	735	break;
	736	case 'f':
	737	if (strcmp(optarg, "-") == 0)
	738	optarg = NULL;
	739	argv[fopt_count++] = optarg;
	740	break;
	741	case 't':
	742	get_keytypes = 0;
	743	tname = strtok(optarg, ",");
	744	while (tname) {
	745	int type = key_type_from_name(tname);
	746	switch (type) {
	747	case KEY_RSA1:
	748	get_keytypes \|= KT_RSA1;
	749	break;
	750	case KEY_DSA:
	751	get_keytypes \|= KT_DSA;
	752	break;
	753	case KEY_RSA:
	754	get_keytypes \|= KT_RSA;
	755	break;
	756	case KEY_UNSPEC:
e9a17296	757	fatal("unknown key type %s", tname);
3c0ef626	758	}
	759	tname = strtok(NULL, ",");
	760	}
	761	break;
	762	case '4':
	763	IPv4or6 = AF_INET;
	764	break;
	765	case '6':
	766	IPv4or6 = AF_INET6;
	767	break;
	768	case '?':
	769	default:
	770	usage();
	771	}
	772	}
	773	if (optind == argc && !fopt_count)
	774	usage();
	775
	776	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
3c0ef626	777
	778	maxfd = fdlim_get(1);
	779	if (maxfd < 0)
	780	fatal("%s: fdlim_get: bad value", __progname);
	781	if (maxfd > MAXMAXFD)
	782	maxfd = MAXMAXFD;
	783	if (MAXCON <= 0)
	784	fatal("%s: not enough file descriptors", __progname);
	785	if (maxfd > fdlim_get(0))
	786	fdlim_set(maxfd);
	787	fdcon = xmalloc(maxfd * sizeof(con));
	788	memset(fdcon, 0, maxfd * sizeof(con));
	789
	790	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	791	read_wait = xmalloc(read_wait_size);
	792	memset(read_wait, 0, read_wait_size);
	793
	794	if (fopt_count) {
	795	Linebuf *lb;
	796	char *line;
	797	int j;
	798
	799	for (j = 0; j < fopt_count; j++) {
	800	lb = Linebuf_alloc(argv[j], error);
	801	if (!lb)
	802	continue;
	803	while ((line = Linebuf_getline(lb)) != NULL)
	804	do_host(line);
	805	Linebuf_free(lb);
	806	}
	807	}
	808
	809	while (optind < argc)
	810	do_host(argv[optind++]);
	811
	812	while (ncon > 0)
	813	conloop();
	814
	815	return (0);
	816	}