[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"
#include "pathnames.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_pathnames();
	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"
e54b3d7c	10	RCSID("$OpenBSD: ssh-keyscan.c,v 1.40 2002/07/06 17:47:58 stevesk Exp $");
3c0ef626	11
e54b3d7c	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"
2b8f6339	31	#include "pathnames.h"
3c0ef626	32
	33	/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
	34	Default value is AF_UNSPEC means both IPv4 and IPv6. */
	35	#ifdef IPV4_DEFAULT
	36	int IPv4or6 = AF_INET;
	37	#else
	38	int IPv4or6 = AF_UNSPEC;
	39	#endif
	40
	41	int ssh_port = SSH_DEFAULT_PORT;
	42
	43	#define KT_RSA1 1
	44	#define KT_DSA 2
	45	#define KT_RSA 4
	46
	47	int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
	48
	49	#define MAXMAXFD 256
	50
	51	/* The number of seconds after which to give up on a TCP connection */
	52	int timeout = 5;
	53
	54	int maxfd;
	55	#define MAXCON (maxfd - 10)
	56
	57	#ifdef HAVE___PROGNAME
	58	extern char *__progname;
	59	#else
	60	char *__progname;
	61	#endif
	62	fd_set *read_wait;
	63	size_t read_wait_size;
	64	int ncon;
	65	int nonfatal_fatal = 0;
	66	jmp_buf kexjmp;
	67	Key *kexjmp_key;
	68
	69	/*
	70	* Keep a connection structure for each file descriptor. The state
	71	* associated with file descriptor n is held in fdcon[n].
	72	*/
	73	typedef struct Connection {
	74	u_char c_status; /* State of connection on this file desc. */
	75	#define CS_UNUSED 0 /* File descriptor unused */
	76	#define CS_CON 1 /* Waiting to connect/read greeting */
	77	#define CS_SIZE 2 /* Waiting to read initial packet size */
	78	#define CS_KEYS 3 /* Waiting to read public key packet */
	79	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
	80	int c_plen; /* Packet length field for ssh packet */
	81	int c_len; /* Total bytes which must be read. */
	82	int c_off; /* Length of data read so far. */
	83	int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
	84	char c_namebase; / Address to free for c_name and c_namelist */
	85	char c_name; / Hostname of connection for errors */
	86	char c_namelist; / Pointer to other possible addresses */
	87	char c_output_name; / Hostname of connection for output */
	88	char c_data; / Data read from this fd */
	89	Kex c_kex; / The key-exchange struct for ssh2 */
	90	struct timeval c_tv; /* Time at which connection gets aborted */
	91	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
	92	} con;
	93
	94	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
	95	con *fdcon;
96
97	/*
98	* This is just a wrapper around fgets() to make it usable.
99	*/
100
101	/* Stress-test. Increase this later. */
102	#define LINEBUF_SIZE 16
103
104	typedef struct {
105	char *buf;
106	u_int size;
107	int lineno;
108	const char *filename;
109	FILE *stream;
110	void (errfun) (const char ,...);
111	} Linebuf;
112
113	static Linebuf *
114	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
115	{
116	Linebuf *lb;
117
118	if (!(lb = malloc(sizeof(*lb)))) {
119	if (errfun)
e54b3d7c	120	(*errfun) ("linebuf (%s): malloc failed\n",
e54b3d7c	121	filename ? filename : "(stdin)");
3c0ef626	122	return (NULL);
	123	}
	124	if (filename) {
	125	lb->filename = filename;
	126	if (!(lb->stream = fopen(filename, "r"))) {
	127	xfree(lb);
	128	if (errfun)
	129	(*errfun) ("%s: %s\n", filename, strerror(errno));
	130	return (NULL);
	131	}
	132	} else {
	133	lb->filename = "(stdin)";
	134	lb->stream = stdin;
	135	}
	136
	137	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
	138	if (errfun)
	139	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
	140	xfree(lb);
	141	return (NULL);
	142	}
	143	lb->errfun = errfun;
	144	lb->lineno = 0;
	145	return (lb);
	146	}
	147
	148	static void
	149	Linebuf_free(Linebuf * lb)
	150	{
	151	fclose(lb->stream);
	152	xfree(lb->buf);
	153	xfree(lb);
	154	}
	155
	156	#if 0
	157	static void
	158	Linebuf_restart(Linebuf * lb)
	159	{
	160	clearerr(lb->stream);
	161	rewind(lb->stream);
	162	lb->lineno = 0;
	163	}
	164
	165	static int
	166	Linebuf_lineno(Linebuf * lb)
	167	{
	168	return (lb->lineno);
	169	}
	170	#endif
	171
	172	static char *
	173	Linebuf_getline(Linebuf * lb)
	174	{
	175	int n = 0;
e54b3d7c	176	void *p;
3c0ef626	177
	178	lb->lineno++;
	179	for (;;) {
	180	/* Read a line */
	181	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
	182	if (ferror(lb->stream) && lb->errfun)
e54b3d7c	183	(*lb->errfun)("%s: %s\n", lb->filename,
3c0ef626	184	strerror(errno));
	185	return (NULL);
	186	}
	187	n = strlen(lb->buf);
	188
	189	/* Return it or an error if it fits */
	190	if (n > 0 && lb->buf[n - 1] == '\n') {
	191	lb->buf[n - 1] = '\0';
	192	return (lb->buf);
	193	}
	194	if (n != lb->size - 1) {
	195	if (lb->errfun)
e54b3d7c	196	(*lb->errfun)("%s: skipping incomplete last line\n",
3c0ef626	197	lb->filename);
	198	return (NULL);
	199	}
	200	/* Double the buffer if we need more space */
e54b3d7c	201	lb->size *= 2;
	202	if ((p = realloc(lb->buf, lb->size)) == NULL) {
	203	lb->size /= 2;
3c0ef626	204	if (lb->errfun)
e54b3d7c	205	(*lb->errfun)("linebuf (%s): realloc failed\n",
3c0ef626	206	lb->filename);
	207	return (NULL);
	208	}
e54b3d7c	209	lb->buf = p;
3c0ef626	210	}
	211	}
	212
	213	static int
	214	fdlim_get(int hard)
	215	{
	216	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
	217	struct rlimit rlfd;
	218
	219	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	220	return (-1);
	221	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
	222	return 10000;
	223	else
	224	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
	225	#elif defined (HAVE_SYSCONF)
	226	return sysconf (_SC_OPEN_MAX);
	227	#else
	228	return 10000;
	229	#endif
	230	}
	231
	232	static int
	233	fdlim_set(int lim)
	234	{
	235	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	236	struct rlimit rlfd;
	237	#endif
e54b3d7c	238
3c0ef626	239	if (lim <= 0)
	240	return (-1);
	241	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	242	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	243	return (-1);
	244	rlfd.rlim_cur = lim;
	245	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	246	return (-1);
	247	#elif defined (HAVE_SETDTABLESIZE)
	248	setdtablesize(lim);
	249	#endif
	250	return (0);
	251	}
	252
	253	/*
	254	* This is an strsep function that returns a null field for adjacent
	255	* separators. This is the same as the 4.4BSD strsep, but different from the
	256	* one in the GNU libc.
	257	*/
	258	static char *
	259	xstrsep(char *str, const char delim)
	260	{
	261	char s, e;
	262
	263	if (!**str)
	264	return (NULL);
	265
	266	s = *str;
	267	e = s + strcspn(s, delim);
	268
	269	if (*e != '\0')
	270	*e++ = '\0';
	271	*str = e;
	272
	273	return (s);
	274	}
	275
	276	/*
	277	* Get the next non-null token (like GNU strsep). Strsep() will return a
	278	* null token for two adjacent separators, so we may have to loop.
	279	*/
	280	static char *
	281	strnnsep(char *stringp, char delim)
	282	{
	283	char *tok;
	284
	285	do {
	286	tok = xstrsep(stringp, delim);
	287	} while (tok && *tok == '\0');
	288	return (tok);
	289	}
	290
	291	static Key *
	292	keygrab_ssh1(con *c)
	293	{
	294	static Key *rsa;
	295	static Buffer msg;
	296
	297	if (rsa == NULL) {
	298	buffer_init(&msg);
	299	rsa = key_new(KEY_RSA1);
	300	}
	301	buffer_append(&msg, c->c_data, c->c_plen);
	302	buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
303	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
304	error("%s: invalid packet type", c->c_name);
305	buffer_clear(&msg);
306	return NULL;
307	}
308	buffer_consume(&msg, 8); /* cookie */
309
310	/* server key */
311	(void) buffer_get_int(&msg);
312	buffer_get_bignum(&msg, rsa->rsa->e);
313	buffer_get_bignum(&msg, rsa->rsa->n);
314
315	/* host key */
316	(void) buffer_get_int(&msg);
317	buffer_get_bignum(&msg, rsa->rsa->e);
318	buffer_get_bignum(&msg, rsa->rsa->n);
319
320	buffer_clear(&msg);
321
322	return (rsa);
323	}
324
325	static int
326	hostjump(Key *hostkey)
327	{
328	kexjmp_key = hostkey;
329	longjmp(kexjmp, 1);
330	}
331
332	static int
333	ssh2_capable(int remote_major, int remote_minor)
334	{
335	switch (remote_major) {
336	case 1:
337	if (remote_minor == 99)
338	return 1;
339	break;
340	case 2:
341	return 1;
342	default:
343	break;
344	}
345	return 0;
346	}
347
348	static Key *
349	keygrab_ssh2(con *c)
350	{
351	int j;
352
353	packet_set_connection(c->c_fd, c->c_fd);
354	enable_compat20();
355	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
356	"ssh-dss": "ssh-rsa";
357	c->c_kex = kex_setup(myproposal);
358	c->c_kex->verify_host_key = hostjump;
359
360	if (!(j = setjmp(kexjmp))) {
361	nonfatal_fatal = 1;
362	dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
363	fprintf(stderr, "Impossible! dispatch_run() returned!\n");
364	exit(1);
365	}
366	nonfatal_fatal = 0;
367	xfree(c->c_kex);
368	c->c_kex = NULL;
369	packet_close();
370
371	return j < 0? NULL : kexjmp_key;
372	}
373
374	static void
375	keyprint(con c, Key key)
376	{
377	if (!key)
378	return;
379
380	fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
381	key_write(key, stdout);
382	fputs("\n", stdout);
383	}
384
385	static int
386	tcpconnect(char *host)
387	{
388	struct addrinfo hints, ai, aitop;
389	char strport[NI_MAXSERV];
390	int gaierr, s = -1;
391
392	snprintf(strport, sizeof strport, "%d", ssh_port);
393	memset(&hints, 0, sizeof(hints));
394	hints.ai_family = IPv4or6;
395	hints.ai_socktype = SOCK_STREAM;
396	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
397	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
398	for (ai = aitop; ai; ai = ai->ai_next) {
399	s = socket(ai->ai_family, SOCK_STREAM, 0);
400	if (s < 0) {
401	error("socket: %s", strerror(errno));
402	continue;
403	}
404	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
405	fatal("F_SETFL: %s", strerror(errno));
406	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
407	errno != EINPROGRESS)
408	error("connect (`%s'): %s", host, strerror(errno));
409	else
410	break;
411	close(s);
412	s = -1;
413	}
414	freeaddrinfo(aitop);
415	return s;
416	}
417
418	static int
419	conalloc(char iname, char oname, int keytype)
420	{
3c0ef626	421	char namebase, name, *namelist;
e54b3d7c	422	int s;
3c0ef626	423
	424	namebase = namelist = xstrdup(iname);
	425
	426	do {
	427	name = xstrsep(&namelist, ",");
	428	if (!name) {
	429	xfree(namebase);
	430	return (-1);
	431	}
	432	} while ((s = tcpconnect(name)) < 0);
	433
	434	if (s >= maxfd)
	435	fatal("conalloc: fdno %d too high", s);
	436	if (fdcon[s].c_status)
	437	fatal("conalloc: attempt to reuse fdno %d", s);
	438
	439	fdcon[s].c_fd = s;
	440	fdcon[s].c_status = CS_CON;
	441	fdcon[s].c_namebase = namebase;
	442	fdcon[s].c_name = name;
	443	fdcon[s].c_namelist = namelist;
	444	fdcon[s].c_output_name = xstrdup(oname);
	445	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	446	fdcon[s].c_len = 4;
	447	fdcon[s].c_off = 0;
	448	fdcon[s].c_keytype = keytype;
	449	gettimeofday(&fdcon[s].c_tv, NULL);
	450	fdcon[s].c_tv.tv_sec += timeout;
	451	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	452	FD_SET(s, read_wait);
	453	ncon++;
	454	return (s);
	455	}
	456
	457	static void
	458	confree(int s)
	459	{
	460	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
	461	fatal("confree: attempt to free bad fdno %d", s);
	462	close(s);
	463	xfree(fdcon[s].c_namebase);
	464	xfree(fdcon[s].c_output_name);
	465	if (fdcon[s].c_status == CS_KEYS)
	466	xfree(fdcon[s].c_data);
	467	fdcon[s].c_status = CS_UNUSED;
	468	fdcon[s].c_keytype = 0;
	469	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	470	FD_CLR(s, read_wait);
	471	ncon--;
	472	}
	473
	474	static void
	475	contouch(int s)
	476	{
	477	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	478	gettimeofday(&fdcon[s].c_tv, NULL);
	479	fdcon[s].c_tv.tv_sec += timeout;
	480	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	481	}
	482
	483	static int
	484	conrecycle(int s)
	485	{
3c0ef626	486	con *c = &fdcon[s];
e54b3d7c	487	int ret;
3c0ef626	488
	489	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	490	confree(s);
	491	return (ret);
	492	}
	493
	494	static void
	495	congreet(int s)
	496	{
e54b3d7c	497	int remote_major, remote_minor, n = 0;
3c0ef626	498	char buf[256], *cp;
e9a17296	499	char remote_version[sizeof buf];
3c0ef626	500	size_t bufsiz;
3c0ef626	501	con *c = &fdcon[s];
	502
	503	bufsiz = sizeof(buf);
	504	cp = buf;
	505	while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
	506	if (*cp == '\r')
	507	*cp = '\n';
	508	cp++;
	509	}
	510	if (n < 0) {
	511	if (errno != ECONNREFUSED)
	512	error("read (%s): %s", c->c_name, strerror(errno));
	513	conrecycle(s);
	514	return;
	515	}
e9a17296	516	if (n == 0) {
	517	error("%s: Connection closed by remote host", c->c_name);
	518	conrecycle(s);
	519	return;
	520	}
3c0ef626	521	if (cp != '\n' && cp != '\r') {
	522	error("%s: bad greeting", c->c_name);
	523	confree(s);
	524	return;
	525	}
	526	*cp = '\0';
e9a17296	527	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	528	&remote_major, &remote_minor, remote_version) == 3)
	529	compat_datafellows(remote_version);
	530	else
	531	datafellows = 0;
3c0ef626	532	if (c->c_keytype != KT_RSA1) {
3c0ef626	533	if (!ssh2_capable(remote_major, remote_minor)) {
	534	debug("%s doesn't support ssh2", c->c_name);
	535	confree(s);
	536	return;
	537	}
e9a17296	538	} else if (remote_major != 1) {
	539	debug("%s doesn't support ssh1", c->c_name);
	540	confree(s);
	541	return;
3c0ef626	542	}
	543	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	544	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	545	c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	546	c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
	547	if (atomicio(write, s, buf, n) != n) {
	548	error("write (%s): %s", c->c_name, strerror(errno));
	549	confree(s);
	550	return;
	551	}
	552	if (c->c_keytype != KT_RSA1) {
	553	keyprint(c, keygrab_ssh2(c));
	554	confree(s);
	555	return;
	556	}
	557	c->c_status = CS_SIZE;
	558	contouch(s);
	559	}
	560
	561	static void
	562	conread(int s)
	563	{
3c0ef626	564	con *c = &fdcon[s];
e54b3d7c	565	int n;
3c0ef626	566
	567	if (c->c_status == CS_CON) {
	568	congreet(s);
	569	return;
	570	}
	571	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
	572	if (n < 0) {
	573	error("read (%s): %s", c->c_name, strerror(errno));
	574	confree(s);
	575	return;
	576	}
	577	c->c_off += n;
	578
	579	if (c->c_off == c->c_len)
	580	switch (c->c_status) {
	581	case CS_SIZE:
	582	c->c_plen = htonl(c->c_plen);
	583	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	584	c->c_off = 0;
	585	c->c_data = xmalloc(c->c_len);
	586	c->c_status = CS_KEYS;
	587	break;
	588	case CS_KEYS:
	589	keyprint(c, keygrab_ssh1(c));
	590	confree(s);
	591	return;
	592	break;
	593	default:
	594	fatal("conread: invalid status %d", c->c_status);
	595	break;
	596	}
	597
	598	contouch(s);
	599	}
	600
	601	static void
	602	conloop(void)
	603	{
3c0ef626	604	struct timeval seltime, now;
e54b3d7c	605	fd_set r, e;
3c0ef626	606	con *c;
e54b3d7c	607	int i;
3c0ef626	608
3c0ef626	609	gettimeofday(&now, NULL);
ff2d7a98	610	c = TAILQ_FIRST(&tq);
3c0ef626	611
	612	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
	613	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	614	seltime = c->c_tv;
	615	seltime.tv_sec -= now.tv_sec;
	616	seltime.tv_usec -= now.tv_usec;
	617	if (seltime.tv_usec < 0) {
	618	seltime.tv_usec += 1000000;
	619	seltime.tv_sec--;
	620	}
	621	} else
	622	seltime.tv_sec = seltime.tv_usec = 0;
	623
	624	r = xmalloc(read_wait_size);
	625	memcpy(r, read_wait, read_wait_size);
	626	e = xmalloc(read_wait_size);
	627	memcpy(e, read_wait, read_wait_size);
	628
	629	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	630	(errno == EAGAIN \|\| errno == EINTR))
	631	;
	632
	633	for (i = 0; i < maxfd; i++) {
	634	if (FD_ISSET(i, e)) {
	635	error("%s: exception!", fdcon[i].c_name);
	636	confree(i);
	637	} else if (FD_ISSET(i, r))
	638	conread(i);
	639	}
	640	xfree(r);
	641	xfree(e);
	642
ff2d7a98	643	c = TAILQ_FIRST(&tq);
3c0ef626	644	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
	645	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	646	int s = c->c_fd;
	647
ff2d7a98	648	c = TAILQ_NEXT(c, c_link);
3c0ef626	649	conrecycle(s);
	650	}
	651	}
	652
	653	static void
	654	do_host(char *host)
	655	{
	656	char *name = strnnsep(&host, " \t\n");
	657	int j;
	658
e9a17296	659	if (name == NULL)
e9a17296	660	return;
3c0ef626	661	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
	662	if (get_keytypes & j) {
	663	while (ncon >= MAXCON)
	664	conloop();
	665	conalloc(name, *host ? host : name, j);
	666	}
	667	}
	668	}
	669
e9a17296	670	void
e9a17296	671	fatal(const char *fmt,...)
3c0ef626	672	{
e9a17296	673	va_list args;
e54b3d7c	674
e9a17296	675	va_start(args, fmt);
	676	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	677	va_end(args);
3c0ef626	678	if (nonfatal_fatal)
3c0ef626	679	longjmp(kexjmp, -1);
e9a17296	680	else
e9a17296	681	fatal_cleanup();
3c0ef626	682	}
	683
	684	static void
	685	usage(void)
	686	{
e54b3d7c	687	fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-f file]\n"
e54b3d7c	688	"\t\t [host \| addrlist namelist] [...]\n",
3c0ef626	689	__progname);
3c0ef626	690	exit(1);
	691	}
	692
	693	int
	694	main(int argc, char **argv)
	695	{
	696	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	697	int opt, fopt_count = 0;
	698	char *tname;
	699
	700	extern int optind;
	701	extern char *optarg;
	702
	703	__progname = get_progname(argv[0]);
2b8f6339	704	init_pathnames();
3c0ef626	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':
e54b3d7c	722	timeout = convtime(optarg);
	723	if (timeout == -1 \|\| timeout == 0) {
	724	fprintf(stderr, "Bad timeout '%s'\n", optarg);
3c0ef626	725	usage();
e54b3d7c	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	}