[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 1.47 2004/03/08 09:38:05 djm 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. */
int IPv4or6 = AF_UNSPEC;

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 SSH_SYSFDMAX;
	else
		return hard ? rlfd.rlim_max : rlfd.rlim_cur;
#else
	return SSH_SYSFDMAX;
#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, ai->ai_socktype, ai->ai_protocol);
		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 = 0, remote_minor = 0, 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(vwrite, 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
		exit(255);
}

static void
usage(void)
{
	fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-t type] [-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 = ssh_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"
2a304a95	10	RCSID("$OpenBSD: ssh-keyscan.c,v 1.47 2004/03/08 09:38:05 djm 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. */
3c0ef626	35	int IPv4or6 = AF_UNSPEC;
3c0ef626	36
	37	int ssh_port = SSH_DEFAULT_PORT;
	38
	39	#define KT_RSA1 1
	40	#define KT_DSA 2
	41	#define KT_RSA 4
	42
	43	int get_keytypes = KT_RSA1; /* Get only RSA1 keys by default */
	44
	45	#define MAXMAXFD 256
	46
	47	/* The number of seconds after which to give up on a TCP connection */
	48	int timeout = 5;
	49
	50	int maxfd;
	51	#define MAXCON (maxfd - 10)
	52
	53	#ifdef HAVE___PROGNAME
	54	extern char *__progname;
	55	#else
	56	char *__progname;
	57	#endif
	58	fd_set *read_wait;
	59	size_t read_wait_size;
	60	int ncon;
	61	int nonfatal_fatal = 0;
	62	jmp_buf kexjmp;
	63	Key *kexjmp_key;
	64
	65	/*
	66	* Keep a connection structure for each file descriptor. The state
	67	* associated with file descriptor n is held in fdcon[n].
	68	*/
	69	typedef struct Connection {
	70	u_char c_status; /* State of connection on this file desc. */
	71	#define CS_UNUSED 0 /* File descriptor unused */
	72	#define CS_CON 1 /* Waiting to connect/read greeting */
	73	#define CS_SIZE 2 /* Waiting to read initial packet size */
	74	#define CS_KEYS 3 /* Waiting to read public key packet */
	75	int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
	76	int c_plen; /* Packet length field for ssh packet */
	77	int c_len; /* Total bytes which must be read. */
	78	int c_off; /* Length of data read so far. */
	79	int c_keytype; /* Only one of KT_RSA1, KT_DSA, or KT_RSA */
	80	char c_namebase; / Address to free for c_name and c_namelist */
	81	char c_name; / Hostname of connection for errors */
	82	char c_namelist; / Pointer to other possible addresses */
	83	char c_output_name; / Hostname of connection for output */
	84	char c_data; / Data read from this fd */
	85	Kex c_kex; / The key-exchange struct for ssh2 */
	86	struct timeval c_tv; /* Time at which connection gets aborted */
	87	TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
	88	} con;
	89
	90	TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
	91	con *fdcon;
	92
	93	/*
	94	* This is just a wrapper around fgets() to make it usable.
	95	*/
	96
	97	/* Stress-test. Increase this later. */
	98	#define LINEBUF_SIZE 16
	99
100	typedef struct {
101	char *buf;
102	u_int size;
103	int lineno;
104	const char *filename;
105	FILE *stream;
106	void (errfun) (const char ,...);
107	} Linebuf;
108
109	static Linebuf *
110	Linebuf_alloc(const char filename, void (errfun) (const char *,...))
111	{
112	Linebuf *lb;
113
114	if (!(lb = malloc(sizeof(*lb)))) {
115	if (errfun)
e54b3d7c	116	(*errfun) ("linebuf (%s): malloc failed\n",
e54b3d7c	117	filename ? filename : "(stdin)");
3c0ef626	118	return (NULL);
	119	}
	120	if (filename) {
	121	lb->filename = filename;
	122	if (!(lb->stream = fopen(filename, "r"))) {
	123	xfree(lb);
	124	if (errfun)
	125	(*errfun) ("%s: %s\n", filename, strerror(errno));
	126	return (NULL);
	127	}
	128	} else {
	129	lb->filename = "(stdin)";
	130	lb->stream = stdin;
	131	}
	132
	133	if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
	134	if (errfun)
	135	(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
	136	xfree(lb);
	137	return (NULL);
	138	}
	139	lb->errfun = errfun;
	140	lb->lineno = 0;
	141	return (lb);
	142	}
	143
	144	static void
	145	Linebuf_free(Linebuf * lb)
	146	{
	147	fclose(lb->stream);
	148	xfree(lb->buf);
	149	xfree(lb);
	150	}
	151
	152	#if 0
	153	static void
	154	Linebuf_restart(Linebuf * lb)
	155	{
	156	clearerr(lb->stream);
	157	rewind(lb->stream);
	158	lb->lineno = 0;
	159	}
	160
	161	static int
	162	Linebuf_lineno(Linebuf * lb)
	163	{
	164	return (lb->lineno);
	165	}
	166	#endif
	167
	168	static char *
	169	Linebuf_getline(Linebuf * lb)
	170	{
	171	int n = 0;
e54b3d7c	172	void *p;
3c0ef626	173
	174	lb->lineno++;
	175	for (;;) {
	176	/* Read a line */
	177	if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
	178	if (ferror(lb->stream) && lb->errfun)
e54b3d7c	179	(*lb->errfun)("%s: %s\n", lb->filename,
3c0ef626	180	strerror(errno));
	181	return (NULL);
	182	}
	183	n = strlen(lb->buf);
	184
	185	/* Return it or an error if it fits */
	186	if (n > 0 && lb->buf[n - 1] == '\n') {
	187	lb->buf[n - 1] = '\0';
	188	return (lb->buf);
	189	}
	190	if (n != lb->size - 1) {
	191	if (lb->errfun)
e54b3d7c	192	(*lb->errfun)("%s: skipping incomplete last line\n",
3c0ef626	193	lb->filename);
	194	return (NULL);
	195	}
	196	/* Double the buffer if we need more space */
e54b3d7c	197	lb->size *= 2;
	198	if ((p = realloc(lb->buf, lb->size)) == NULL) {
	199	lb->size /= 2;
3c0ef626	200	if (lb->errfun)
e54b3d7c	201	(*lb->errfun)("linebuf (%s): realloc failed\n",
3c0ef626	202	lb->filename);
	203	return (NULL);
	204	}
e54b3d7c	205	lb->buf = p;
3c0ef626	206	}
	207	}
	208
	209	static int
	210	fdlim_get(int hard)
	211	{
	212	#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
	213	struct rlimit rlfd;
	214
	215	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	216	return (-1);
	217	if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
416fd2a8	218	return SSH_SYSFDMAX;
3c0ef626	219	else
3c0ef626	220	return hard ? rlfd.rlim_max : rlfd.rlim_cur;
3c0ef626	221	#else
416fd2a8	222	return SSH_SYSFDMAX;
3c0ef626	223	#endif
	224	}
	225
	226	static int
	227	fdlim_set(int lim)
	228	{
	229	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	230	struct rlimit rlfd;
	231	#endif
e54b3d7c	232
3c0ef626	233	if (lim <= 0)
	234	return (-1);
	235	#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
	236	if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	237	return (-1);
	238	rlfd.rlim_cur = lim;
	239	if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
	240	return (-1);
	241	#elif defined (HAVE_SETDTABLESIZE)
	242	setdtablesize(lim);
	243	#endif
	244	return (0);
	245	}
	246
	247	/*
	248	* This is an strsep function that returns a null field for adjacent
	249	* separators. This is the same as the 4.4BSD strsep, but different from the
	250	* one in the GNU libc.
	251	*/
	252	static char *
	253	xstrsep(char *str, const char delim)
	254	{
	255	char s, e;
	256
	257	if (!**str)
	258	return (NULL);
	259
	260	s = *str;
	261	e = s + strcspn(s, delim);
	262
	263	if (*e != '\0')
	264	*e++ = '\0';
	265	*str = e;
	266
	267	return (s);
	268	}
	269
	270	/*
	271	* Get the next non-null token (like GNU strsep). Strsep() will return a
	272	* null token for two adjacent separators, so we may have to loop.
	273	*/
	274	static char *
	275	strnnsep(char *stringp, char delim)
	276	{
	277	char *tok;
	278
	279	do {
	280	tok = xstrsep(stringp, delim);
	281	} while (tok && *tok == '\0');
	282	return (tok);
	283	}
	284
	285	static Key *
	286	keygrab_ssh1(con *c)
	287	{
	288	static Key *rsa;
	289	static Buffer msg;
	290
	291	if (rsa == NULL) {
	292	buffer_init(&msg);
	293	rsa = key_new(KEY_RSA1);
	294	}
	295	buffer_append(&msg, c->c_data, c->c_plen);
	296	buffer_consume(&msg, 8 - (c->c_plen & 7)); /* padding */
297	if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
298	error("%s: invalid packet type", c->c_name);
299	buffer_clear(&msg);
300	return NULL;
301	}
302	buffer_consume(&msg, 8); /* cookie */
303
304	/* server key */
305	(void) buffer_get_int(&msg);
306	buffer_get_bignum(&msg, rsa->rsa->e);
307	buffer_get_bignum(&msg, rsa->rsa->n);
308
309	/* host 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	buffer_clear(&msg);
315
316	return (rsa);
317	}
318
319	static int
320	hostjump(Key *hostkey)
321	{
322	kexjmp_key = hostkey;
323	longjmp(kexjmp, 1);
324	}
325
326	static int
327	ssh2_capable(int remote_major, int remote_minor)
328	{
329	switch (remote_major) {
330	case 1:
331	if (remote_minor == 99)
332	return 1;
333	break;
334	case 2:
335	return 1;
336	default:
337	break;
338	}
339	return 0;
340	}
341
342	static Key *
343	keygrab_ssh2(con *c)
344	{
345	int j;
346
347	packet_set_connection(c->c_fd, c->c_fd);
348	enable_compat20();
349	myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = c->c_keytype == KT_DSA?
350	"ssh-dss": "ssh-rsa";
351	c->c_kex = kex_setup(myproposal);
1c14df9e	352	c->c_kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1c14df9e	353	c->c_kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
3c0ef626	354	c->c_kex->verify_host_key = hostjump;
	355
	356	if (!(j = setjmp(kexjmp))) {
	357	nonfatal_fatal = 1;
	358	dispatch_run(DISPATCH_BLOCK, &c->c_kex->done, c->c_kex);
	359	fprintf(stderr, "Impossible! dispatch_run() returned!\n");
	360	exit(1);
	361	}
	362	nonfatal_fatal = 0;
	363	xfree(c->c_kex);
	364	c->c_kex = NULL;
	365	packet_close();
	366
	367	return j < 0? NULL : kexjmp_key;
	368	}
	369
	370	static void
	371	keyprint(con c, Key key)
	372	{
	373	if (!key)
	374	return;
	375
	376	fprintf(stdout, "%s ", c->c_output_name ? c->c_output_name : c->c_name);
	377	key_write(key, stdout);
	378	fputs("\n", stdout);
	379	}
	380
	381	static int
	382	tcpconnect(char *host)
	383	{
	384	struct addrinfo hints, ai, aitop;
	385	char strport[NI_MAXSERV];
	386	int gaierr, s = -1;
	387
	388	snprintf(strport, sizeof strport, "%d", ssh_port);
	389	memset(&hints, 0, sizeof(hints));
	390	hints.ai_family = IPv4or6;
	391	hints.ai_socktype = SOCK_STREAM;
	392	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
	393	fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
	394	for (ai = aitop; ai; ai = ai->ai_next) {
70791e56	395	s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
3c0ef626	396	if (s < 0) {
	397	error("socket: %s", strerror(errno));
	398	continue;
	399	}
	400	if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
	401	fatal("F_SETFL: %s", strerror(errno));
	402	if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
	403	errno != EINPROGRESS)
	404	error("connect (`%s'): %s", host, strerror(errno));
	405	else
	406	break;
	407	close(s);
	408	s = -1;
	409	}
	410	freeaddrinfo(aitop);
	411	return s;
	412	}
	413
	414	static int
	415	conalloc(char iname, char oname, int keytype)
	416	{
3c0ef626	417	char namebase, name, *namelist;
e54b3d7c	418	int s;
3c0ef626	419
	420	namebase = namelist = xstrdup(iname);
	421
	422	do {
	423	name = xstrsep(&namelist, ",");
	424	if (!name) {
	425	xfree(namebase);
	426	return (-1);
	427	}
	428	} while ((s = tcpconnect(name)) < 0);
	429
	430	if (s >= maxfd)
	431	fatal("conalloc: fdno %d too high", s);
	432	if (fdcon[s].c_status)
	433	fatal("conalloc: attempt to reuse fdno %d", s);
	434
	435	fdcon[s].c_fd = s;
	436	fdcon[s].c_status = CS_CON;
	437	fdcon[s].c_namebase = namebase;
	438	fdcon[s].c_name = name;
	439	fdcon[s].c_namelist = namelist;
	440	fdcon[s].c_output_name = xstrdup(oname);
	441	fdcon[s].c_data = (char *) &fdcon[s].c_plen;
	442	fdcon[s].c_len = 4;
	443	fdcon[s].c_off = 0;
	444	fdcon[s].c_keytype = keytype;
	445	gettimeofday(&fdcon[s].c_tv, NULL);
	446	fdcon[s].c_tv.tv_sec += timeout;
	447	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	448	FD_SET(s, read_wait);
	449	ncon++;
	450	return (s);
	451	}
	452
	453	static void
	454	confree(int s)
	455	{
	456	if (s >= maxfd \|\| fdcon[s].c_status == CS_UNUSED)
	457	fatal("confree: attempt to free bad fdno %d", s);
	458	close(s);
	459	xfree(fdcon[s].c_namebase);
	460	xfree(fdcon[s].c_output_name);
	461	if (fdcon[s].c_status == CS_KEYS)
	462	xfree(fdcon[s].c_data);
	463	fdcon[s].c_status = CS_UNUSED;
	464	fdcon[s].c_keytype = 0;
	465	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	466	FD_CLR(s, read_wait);
	467	ncon--;
	468	}
	469
	470	static void
	471	contouch(int s)
	472	{
	473	TAILQ_REMOVE(&tq, &fdcon[s], c_link);
	474	gettimeofday(&fdcon[s].c_tv, NULL);
	475	fdcon[s].c_tv.tv_sec += timeout;
	476	TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
	477	}
	478
	479	static int
	480	conrecycle(int s)
	481	{
3c0ef626	482	con *c = &fdcon[s];
e54b3d7c	483	int ret;
3c0ef626	484
	485	ret = conalloc(c->c_namelist, c->c_output_name, c->c_keytype);
	486	confree(s);
	487	return (ret);
	488	}
	489
	490	static void
	491	congreet(int s)
	492	{
2a304a95	493	int remote_major = 0, remote_minor = 0, n = 0;
3c0ef626	494	char buf[256], *cp;
e9a17296	495	char remote_version[sizeof buf];
3c0ef626	496	size_t bufsiz;
3c0ef626	497	con *c = &fdcon[s];
	498
	499	bufsiz = sizeof(buf);
	500	cp = buf;
	501	while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n') {
	502	if (*cp == '\r')
	503	*cp = '\n';
	504	cp++;
	505	}
	506	if (n < 0) {
	507	if (errno != ECONNREFUSED)
	508	error("read (%s): %s", c->c_name, strerror(errno));
	509	conrecycle(s);
	510	return;
	511	}
e9a17296	512	if (n == 0) {
	513	error("%s: Connection closed by remote host", c->c_name);
	514	conrecycle(s);
	515	return;
	516	}
3c0ef626	517	if (cp != '\n' && cp != '\r') {
	518	error("%s: bad greeting", c->c_name);
	519	confree(s);
	520	return;
	521	}
	522	*cp = '\0';
e9a17296	523	if (sscanf(buf, "SSH-%d.%d-%[^\n]\n",
	524	&remote_major, &remote_minor, remote_version) == 3)
	525	compat_datafellows(remote_version);
	526	else
	527	datafellows = 0;
3c0ef626	528	if (c->c_keytype != KT_RSA1) {
3c0ef626	529	if (!ssh2_capable(remote_major, remote_minor)) {
	530	debug("%s doesn't support ssh2", c->c_name);
	531	confree(s);
	532	return;
	533	}
e9a17296	534	} else if (remote_major != 1) {
	535	debug("%s doesn't support ssh1", c->c_name);
	536	confree(s);
	537	return;
3c0ef626	538	}
	539	fprintf(stderr, "# %s %s\n", c->c_name, chop(buf));
	540	n = snprintf(buf, sizeof buf, "SSH-%d.%d-OpenSSH-keyscan\r\n",
	541	c->c_keytype == KT_RSA1? PROTOCOL_MAJOR_1 : PROTOCOL_MAJOR_2,
	542	c->c_keytype == KT_RSA1? PROTOCOL_MINOR_1 : PROTOCOL_MINOR_2);
70791e56	543	if (atomicio(vwrite, s, buf, n) != n) {
3c0ef626	544	error("write (%s): %s", c->c_name, strerror(errno));
	545	confree(s);
	546	return;
	547	}
	548	if (c->c_keytype != KT_RSA1) {
	549	keyprint(c, keygrab_ssh2(c));
	550	confree(s);
	551	return;
	552	}
	553	c->c_status = CS_SIZE;
	554	contouch(s);
	555	}
	556
	557	static void
	558	conread(int s)
	559	{
3c0ef626	560	con *c = &fdcon[s];
e54b3d7c	561	int n;
3c0ef626	562
	563	if (c->c_status == CS_CON) {
	564	congreet(s);
	565	return;
	566	}
	567	n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
	568	if (n < 0) {
	569	error("read (%s): %s", c->c_name, strerror(errno));
	570	confree(s);
	571	return;
	572	}
	573	c->c_off += n;
	574
	575	if (c->c_off == c->c_len)
	576	switch (c->c_status) {
	577	case CS_SIZE:
	578	c->c_plen = htonl(c->c_plen);
	579	c->c_len = c->c_plen + 8 - (c->c_plen & 7);
	580	c->c_off = 0;
	581	c->c_data = xmalloc(c->c_len);
	582	c->c_status = CS_KEYS;
	583	break;
	584	case CS_KEYS:
	585	keyprint(c, keygrab_ssh1(c));
	586	confree(s);
	587	return;
	588	break;
	589	default:
	590	fatal("conread: invalid status %d", c->c_status);
	591	break;
	592	}
	593
	594	contouch(s);
	595	}
	596
	597	static void
	598	conloop(void)
	599	{
3c0ef626	600	struct timeval seltime, now;
e54b3d7c	601	fd_set r, e;
3c0ef626	602	con *c;
e54b3d7c	603	int i;
3c0ef626	604
3c0ef626	605	gettimeofday(&now, NULL);
ff2d7a98	606	c = TAILQ_FIRST(&tq);
3c0ef626	607
	608	if (c && (c->c_tv.tv_sec > now.tv_sec \|\|
	609	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
	610	seltime = c->c_tv;
	611	seltime.tv_sec -= now.tv_sec;
	612	seltime.tv_usec -= now.tv_usec;
	613	if (seltime.tv_usec < 0) {
	614	seltime.tv_usec += 1000000;
	615	seltime.tv_sec--;
	616	}
	617	} else
	618	seltime.tv_sec = seltime.tv_usec = 0;
	619
	620	r = xmalloc(read_wait_size);
	621	memcpy(r, read_wait, read_wait_size);
	622	e = xmalloc(read_wait_size);
	623	memcpy(e, read_wait, read_wait_size);
	624
	625	while (select(maxfd, r, NULL, e, &seltime) == -1 &&
	626	(errno == EAGAIN \|\| errno == EINTR))
	627	;
	628
	629	for (i = 0; i < maxfd; i++) {
	630	if (FD_ISSET(i, e)) {
	631	error("%s: exception!", fdcon[i].c_name);
	632	confree(i);
	633	} else if (FD_ISSET(i, r))
	634	conread(i);
	635	}
	636	xfree(r);
	637	xfree(e);
	638
ff2d7a98	639	c = TAILQ_FIRST(&tq);
3c0ef626	640	while (c && (c->c_tv.tv_sec < now.tv_sec \|\|
	641	(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
	642	int s = c->c_fd;
	643
ff2d7a98	644	c = TAILQ_NEXT(c, c_link);
3c0ef626	645	conrecycle(s);
	646	}
	647	}
	648
	649	static void
	650	do_host(char *host)
	651	{
	652	char *name = strnnsep(&host, " \t\n");
	653	int j;
	654
e9a17296	655	if (name == NULL)
e9a17296	656	return;
3c0ef626	657	for (j = KT_RSA1; j <= KT_RSA; j *= 2) {
	658	if (get_keytypes & j) {
	659	while (ncon >= MAXCON)
	660	conloop();
	661	conalloc(name, *host ? host : name, j);
	662	}
	663	}
	664	}
	665
e9a17296	666	void
e9a17296	667	fatal(const char *fmt,...)
3c0ef626	668	{
e9a17296	669	va_list args;
e54b3d7c	670
e9a17296	671	va_start(args, fmt);
	672	do_log(SYSLOG_LEVEL_FATAL, fmt, args);
	673	va_end(args);
3c0ef626	674	if (nonfatal_fatal)
3c0ef626	675	longjmp(kexjmp, -1);
e9a17296	676	else
416fd2a8	677	exit(255);
3c0ef626	678	}
	679
	680	static void
	681	usage(void)
	682	{
70791e56	683	fprintf(stderr, "usage: %s [-v46] [-p port] [-T timeout] [-t type] [-f file]\n"
e54b3d7c	684	"\t\t [host \| addrlist namelist] [...]\n",
3c0ef626	685	__progname);
3c0ef626	686	exit(1);
	687	}
	688
	689	int
	690	main(int argc, char **argv)
	691	{
	692	int debug_flag = 0, log_level = SYSLOG_LEVEL_INFO;
	693	int opt, fopt_count = 0;
	694	char *tname;
	695
	696	extern int optind;
	697	extern char *optarg;
	698
70791e56	699	__progname = ssh_get_progname(argv[0]);
2b8f6339	700	init_pathnames();
3c0ef626	701	init_rng();
	702	seed_rng();
	703	TAILQ_INIT(&tq);
	704
	705	if (argc <= 1)
	706	usage();
	707
	708	while ((opt = getopt(argc, argv, "v46p:T:t:f:")) != -1) {
	709	switch (opt) {
	710	case 'p':
	711	ssh_port = a2port(optarg);
	712	if (ssh_port == 0) {
	713	fprintf(stderr, "Bad port '%s'\n", optarg);
	714	exit(1);
	715	}
	716	break;
	717	case 'T':
e54b3d7c	718	timeout = convtime(optarg);
	719	if (timeout == -1 \|\| timeout == 0) {
	720	fprintf(stderr, "Bad timeout '%s'\n", optarg);
3c0ef626	721	usage();
e54b3d7c	722	}
3c0ef626	723	break;
	724	case 'v':
	725	if (!debug_flag) {
	726	debug_flag = 1;
	727	log_level = SYSLOG_LEVEL_DEBUG1;
	728	}
	729	else if (log_level < SYSLOG_LEVEL_DEBUG3)
	730	log_level++;
	731	else
	732	fatal("Too high debugging level.");
	733	break;
	734	case 'f':
	735	if (strcmp(optarg, "-") == 0)
	736	optarg = NULL;
	737	argv[fopt_count++] = optarg;
	738	break;
	739	case 't':
	740	get_keytypes = 0;
	741	tname = strtok(optarg, ",");
	742	while (tname) {
	743	int type = key_type_from_name(tname);
	744	switch (type) {
	745	case KEY_RSA1:
	746	get_keytypes \|= KT_RSA1;
	747	break;
	748	case KEY_DSA:
	749	get_keytypes \|= KT_DSA;
	750	break;
	751	case KEY_RSA:
	752	get_keytypes \|= KT_RSA;
	753	break;
	754	case KEY_UNSPEC:
e9a17296	755	fatal("unknown key type %s", tname);
3c0ef626	756	}
	757	tname = strtok(NULL, ",");
	758	}
	759	break;
	760	case '4':
	761	IPv4or6 = AF_INET;
	762	break;
	763	case '6':
	764	IPv4or6 = AF_INET6;
	765	break;
	766	case '?':
	767	default:
	768	usage();
	769	}
	770	}
	771	if (optind == argc && !fopt_count)
	772	usage();
	773
	774	log_init("ssh-keyscan", log_level, SYSLOG_FACILITY_USER, 1);
3c0ef626	775
	776	maxfd = fdlim_get(1);
	777	if (maxfd < 0)
	778	fatal("%s: fdlim_get: bad value", __progname);
	779	if (maxfd > MAXMAXFD)
	780	maxfd = MAXMAXFD;
	781	if (MAXCON <= 0)
	782	fatal("%s: not enough file descriptors", __progname);
	783	if (maxfd > fdlim_get(0))
	784	fdlim_set(maxfd);
	785	fdcon = xmalloc(maxfd * sizeof(con));
	786	memset(fdcon, 0, maxfd * sizeof(con));
	787
	788	read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
	789	read_wait = xmalloc(read_wait_size);
	790	memset(read_wait, 0, read_wait_size);
	791
	792	if (fopt_count) {
	793	Linebuf *lb;
	794	char *line;
	795	int j;
	796
	797	for (j = 0; j < fopt_count; j++) {
	798	lb = Linebuf_alloc(argv[j], error);
	799	if (!lb)
	800	continue;
	801	while ((line = Linebuf_getline(lb)) != NULL)
	802	do_host(line);
	803	Linebuf_free(lb);
	804	}
	805	}
	806
	807	while (optind < argc)
	808	do_host(argv[optind++]);
	809
	810	while (ncon > 0)
	811	conloop();
	812
	813	return (0);
	814	}